A vehicle tire assembly dynamic balance measuring device and testing method

Abstract

The invention relates to the field of tire dynamic balancing machines, and specifically provides a device for measuring the dynamic balance of an automobile tire assembly and a testing method. The testing device comprises a body shell, a main shaft and a balance detection component, wherein the main shaft is provided with a positioning component on the outer side of the body shell to fix the tire, a contour detection component arranged on the body shell, and used to detect the inner contour of the rim; a feeding component and a laser indicator arranged on the body shell, wherein the feeding component is used for automatic feeding; and a control unit, wherein the control unit is used to control feeding and detect dynamic balance. When detecting dynamic balance, the invention can quickly feed materials and automatically indicate the mounting position of dynamic balance blocks, thereby improving the convenience of tire dynamic balance detection.

Description

Technical Field

[0001] The invention relates to the technical field of tire dynamic balancing machines, and in particular to a vehicle tire assembly dynamic balance measuring device and a testing method. Background Art

[0002] Due to manufacturing, wear, tire repair and other reasons, wheels will inevitably have uneven mass distribution. When the wheels rotate at high speed, dynamic imbalance will occur, causing the wheels to shake and the steering wheel to vibrate while the vehicle is driving. In order to eliminate the shaking and wear problems caused by dynamic imbalance of the tire, the automobile tire assembly needs to be dynamically balanced before being installed on the car body, and the tire is dynamically balanced by sticking dynamic balance blocks.

[0003] A tire dynamic balancer is a machine for testing the dynamic balance of tires. Although the current tire dynamic balancers can automatically measure the dynamic balance of a tire assembly, their operation is relatively complicated. For example, during the loading process, the tire needs to be manually moved to the spindle, and then the tire needs to be manually fixed and the tire parameters need to be manually measured. This has the problem of inconvenient operation. Therefore, the present application proposes a dynamic balance measuring device and a testing method for a vehicle tire assembly. Summary of the invention

[0004] The purpose of the present invention is to provide a vehicle tire assembly dynamic balance measuring device and a testing method to solve the problem that the current tire dynamic balance tester is inconvenient to operate.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A dynamic balance measuring device for an automobile tire assembly comprises a body shell, a main shaft and a balance detection component, wherein the body shell is provided with a display panel for displaying information, the main shaft is driven to rotate by a shaft drive motor located in the body shell, the balance detection component is used to detect the vibration of the main shaft to detect the dynamic balance of the tire, the part of the main shaft located outside the body shell is provided with a positioning component to fix the tire, and the measuring device further comprises:

[0007] A contour detection component provided on the housing, for detecting the inner contour of the rim;

[0008] The loading assembly is arranged on the body shell, and the loading assembly includes a lifting bracket, a lifting cylinder, three groups of telescopic clamping parts arranged in parallel and distributed in an equilateral triangle, a clamping power part, a first clamping part and a second clamping part. The lifting bracket is located inside the shell, and a V-shaped plate is arranged on the lifting bracket. The lifting cylinder is connected to the shell and the lifting bracket to lift the lifting bracket. The telescopic clamping part includes a threaded tube rotatably connected to the V-shaped plate and a threaded rod connected to the inside of the threaded tube by threading. One end of the threaded rod located on the outer side of the threaded tube is fixedly connected to a clamping rod vertically arranged with the threaded rod. The clamping power part is fixedly connected to the V-shaped plate and drives the three groups of telescopic clamping parts to rotate synchronously. The first clamping part is fixedly connected to the lifting bracket, and the second clamping part is fixedly connected to the threaded tube. When the threaded rod is extended and retracted, the first clamping part limits the threaded rod in the circumferential direction. When the rim is clamped, the second clamping part clamps the threaded rod so that the threaded rod is fixed to the threaded tube.

[0009] A laser pointer and a control unit, wherein the control unit is used to control the loading component to realize automatic loading, control the main shaft and the balance detection component to work together to measure the dynamic balance of the tire, control the main shaft and the laser pointer to work together to indicate the position of the balance block to be attached on the inner contour, and display the weight of the balance block to be attached on the display panel as a result of the dynamic balance detection.

[0010] Furthermore, the threaded rod is a rod-shaped structure with a waist-shaped cross section, and the first clamping portion includes:

[0011] A limiting wheel, wherein the limiting wheel is sleeved on the threaded rod, and the shaft hole of the limiting wheel is waist-shaped;

[0012] A clamping plate arranged outside the limiting wheel, the clamping plate is an elastic plate, the clamping plate is a ring with a notch, and threaded holes with different thread directions are arranged at both ends of the clamping plate;

[0013] A clamping screw, wherein the clamping screw is provided with two sections of external threads with different rotation directions, and the external threads on the clamping screw are respectively connected to the threaded holes at both ends of the clamping plate;

[0014] A clamping motor, wherein an output end of the clamping motor is fixedly connected to an end of the clamping screw;

[0015] A clamping shell, the clamping shell is located outside the threaded tube, the clamping plate and the clamping screw, and the clamping motor is fixedly connected to the clamping shell;

[0016] Wherein, the first clamping part and the second clamping part have the same structure.

[0017] Further, the three groups of threaded tubes are connected by a transmission part so that the three groups of threaded tubes rotate synchronously, and the transmission part includes a first synchronous wheel fixedly connected to the threaded tube, a avoidance wheel fixed to the lifting bracket, and a second synchronous belt sleeved on the first synchronous wheel, and the avoidance wheel is arranged on the upper side of the first synchronous wheel located below, so that the second synchronous belt is sleeved on the first synchronous wheel and bent into a V shape by the avoidance wheel, so that the second synchronous belt avoids the main shaft;

[0018] The clamping power unit drives one of the threaded tubes to rotate.

[0019] Furthermore, the positioning component includes:

[0020] A positioning cylinder fixedly connected to the main shaft, the positioning cylinder is a cylindrical structure with openings at both ends, one end of the positioning cylinder is fixed to the main shaft, and the other end of the positioning cylinder is provided with a positioning ring to match the positioning surface of the hub;

[0021] A positioning block provided on the main shaft, wherein the positioning block is in the shape of a frustum;

[0022] A positioning spring disposed on the main shaft, wherein two ends of the positioning spring respectively abut against the bottom of the positioning cylinder and the positioning block;

[0023] A fastening nut is arranged on the main shaft, and the fastening nut is located on a side of the positioning block away from the positioning cylinder.

[0024] Furthermore, the contour detection component includes:

[0025] Two groups of linear laser emitters are fixedly connected to the body shell, the two groups of linear laser emitters are mirror-imaged about the vertical center axis of the body shell, and the two linear light emitters are V-shaped, and the linear light emitters emit linear lasers and irradiate the inner wall of the rim;

[0026] The image acquisition component is used to acquire the linear light spot on the inner wall of the rim, and the control unit calculates the inner contour of the rim based on the acquired linear light spot.

[0027] The present invention also discloses a method for measuring the dynamic balance of an automobile tire assembly, which is based on the above-mentioned automobile tire assembly dynamic balance measuring device to achieve the measurement of the dynamic balance of the automobile tire, and is characterized in that it includes the following steps:

[0028] The feeding assembly clamps the tire and then mounts the tire on the main shaft, and the positioning assembly positions the tire;

[0029] The linear light emitter emits a linear laser and irradiates the inner wall of the rim, the image acquisition component acquires the linear light spot, the control unit calculates the radius of the circle where the light spot is located based on the distance between two light spots on the same circle on the linear light spot, and obtains the inner contour parameters of the rim according to the radius of each circle on the rim;

[0030] The control unit starts the main shaft to drive the tire to rotate, and at the same time starts the balance detection component to measure the dynamic balance of the tire, and displays the weight of the balance weight to be attached on the display panel according to the measurement result, and indicates the position of the balance weight to be attached through the laser indicator.

[0031] Preferably, the method for the control unit to calculate the rim profile comprises the following steps:

[0032] Step S10, acquiring an image of a linear light spot on the rim;

[0033] Step S20, evenly extract a number of points on the linear light spot, calculate the distance between two light spots on the same circle, calculate the radius of the circle based on the calculation result and the angle of the linear laser, calculate the distance between two adjacent points on the same light spot, calculate the radius change within the rim based on the radius of the circle and the distance between adjacent points on the same light spot, and draw the inner contour of the rim based on the radius change of the rim.

[0034] Preferably, when indicating the position of the balancing weight, the control unit controls the shaft driving motor to drive the main shaft to rotate, so that the position where the rim needs to be against the balancing weight rotates to the position of the laser indicator spot.

[0035] In summary, the present invention has the following beneficial effects compared with the prior art:

[0036] The automobile tire assembly dynamic balance test device disclosed in the embodiment of the present invention lifts the tire assembly by arranging a loading component and automatically installs the tire assembly on the main shaft, so that quick loading can be achieved when detecting dynamic balance. At the same time, it can also automatically detect and indicate the mounting position of the balance block, thereby improving the convenience of tire dynamic balance detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 The present invention is a schematic structural diagram of a vehicle tire assembly dynamic balance measuring device disclosed in an embodiment of the present invention.

[0038] Figure 2 The present invention is a front view of a vehicle tire assembly dynamic balance measuring device disclosed in an embodiment of the present invention.

[0039] Figure 3 for Figure 2 Sectional view of AA.

[0040] Figure 4The present invention is a detection position diagram of a contour detection component in a vehicle tire assembly dynamic balance measurement device disclosed in an embodiment of the present invention.

[0041] Figure 5 The present invention is a schematic diagram of a linear light spot of a contour detection component on the inner contour of a wheel rim in a dynamic balance measurement device for an automobile tire assembly disclosed in an embodiment of the present invention.

[0042] Figure 6 The present invention is a schematic diagram showing the principle of calculating the inner diameter of a rim in a contour detection component of a dynamic balance measuring device for an automobile tire assembly disclosed in an embodiment of the present invention.

[0043] Figure 7 It is a structural schematic diagram of a first viewing angle of a feeding component in a vehicle tire assembly dynamic balance measuring device disclosed in an embodiment of the present invention.

[0044] Figure 8 It is a structural schematic diagram of a second viewing angle of a feeding component in the automobile tire assembly dynamic balance measuring device disclosed in an embodiment of the present invention.

[0045] Fig. 9 The present invention is a front view of a feeding assembly in a dynamic balance measuring device for an automobile tire assembly disclosed in an embodiment of the present invention.

[0046] Fig.10 for Fig. 9 Cross-sectional view of BB.

[0047] Fig.11 The present invention is a schematic diagram of the connection between the first clamping part and the threaded rod in the automobile tire assembly dynamic balance measuring device disclosed in an embodiment of the present invention.

[0048] Fig.12 for Fig.10 Cross-sectional view of CC.

[0049] Fig.13 The present invention is a schematic structural diagram of a nut sleeve in a vehicle tire assembly dynamic balance measuring device disclosed in an embodiment of the present invention.

[0050] Reference numerals:

[0051] 100, housing; 110, display panel; 120, operation panel; 130, storage box; 140, mounting bracket;

[0052] 200, spindle; 210, spindle drive motor;

[0053] 300, balance detection component;

[0054] 400, contour detection component; 410, linear laser transmitter; 420, image acquisition component; 421, acquisition bracket;

[0055] 500, feeding assembly; 510, lifting bracket; 511, V-shaped plate; 512, bearing; 513, support plate; 520, lifting cylinder; 530, telescopic clamping part; 531, threaded pipe; 532, threaded rod; 533, clamping rod; 534, anti-slip sleeve; 540, first clamping part; 541, limiting wheel; 542, clamping plate; 543, clamping screw; 544, clamping motor; 545, clamping shell; 550, second clamping part; 560, clamping power part; 561, stepping motor; 562, driving wheel; 563, driven wheel; 564, first synchronous belt; 570, transmission part; 571, first synchronous wheel; 572, avoidance wheel; 573, second synchronous belt;

[0056] 600, positioning assembly; 610, positioning cylinder; 611, spring groove; 612, positioning groove; 613, positioning ring; 620, positioning block; 630, positioning spring; 640, fastening nut;

[0057] 700. Laser pointer;

[0058] 800, Nut sleeve. DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0060] Example 1

[0061] like Figures 1 to 3 As shown, as one of the embodiments of the present invention, the present invention provides a vehicle tire assembly dynamic balance test device, the test device comprising:

[0062] A housing 100 , on which a display panel 110 is disposed for displaying information;

[0063] A main shaft 200 and a balance detection assembly 300 are arranged in the body shell 100. The main shaft 200 is driven to rotate by a shaft driving motor 210 located in the body shell 100. The balance detection assembly 300 is used to detect the vibration of the main shaft 200 to detect the dynamic balance of the tire. The main shaft 200 is provided with a positioning assembly 600 on the outside of the body shell 100 to fix the tire;

[0064] A contour detection component 400 disposed on the housing 100, for detecting the inner contour of the rim;

[0065] A loading assembly 500 and a laser pointer 700 disposed on the housing 100;

[0066] Control unit, under the control of the control unit, the feeding assembly 500 clamps the tire and lifts it to a position coaxial with the main shaft 200, and sets it on the main shaft 200, the main shaft 200 and the balance detection assembly 300 work together to measure the dynamic balance of the tire, after the measurement is completed, the main shaft 200 and the laser indicator 700 work together to indicate the position of the balance weight on the inner contour, and the display panel 110 displays the weight of the balance weight to be attached.

[0067] In this embodiment, an operation panel 120 is further provided on the body shell 100 to input corresponding commands. When installing the tire, the user places the tire on the loading assembly 500, and then inputs the loading command through the operation panel 120. The control unit controls the loading assembly 500 to clamp the tire. After the clamping is completed, the loading assembly 500 lifts the tire. After the loading assembly 500 lifts the tire to the end of the main shaft 200, the tire is placed on the main shaft 200 by shrinking. Then the staff fixes the tire to the main shaft 200 through the positioning assembly 600 on the main shaft 200. At this time, the control unit controls the contour detection assembly 400 to emit two crossed linear laser beams. The intersection of the light curtain formed by the two linear laser beams is the axis of the main shaft 200. The two linear lasers form two linear light spots on the inner wall of the rim. The image acquisition component 420 acquires the image of the linear light spot and based on the acquired image and the linear The inner contour size of the rim is calculated based on the positions of the laser emitter 410 and the image acquisition component 420. The control unit controls the shaft drive motor 210 to drive the main shaft 200 to rotate, and at the same time measures the vibration of the main shaft 200 through the balance detection component 300, thereby measuring the dynamic balance of the tire. The control unit obtains the dynamic imbalance of the tire based on the measurement result of the balance detection component 300 and displays it on the display panel 110 (such as 5g). After the detection is completed, the control unit drives the main shaft 200 to rotate through the shaft drive motor 210 according to the phase of the dynamic balance position detected by the balance detection component 300, so that the position of the dynamic imbalance is located at the lowest point. At the same time, the control unit indicates the position of the balance block (such as the inner ring position and the outer ring position of the rim) through the laser indicator 700. The user can attach the balance block of the corresponding weight to the position indicated by the laser indicator 700 based on the displayed value (weight of the balance block) of the display panel 110;

[0068] It should be noted that the method for calculating the dynamic imbalance by the control unit is the method of the dynamic balancing machine in the prior art. For example, when the tire rotates, the balance detection component 300 can detect the phase and size of the dynamic imbalance at the measuring position on the main shaft, and then calculate the dynamic imbalance of the tire according to the distance between the measuring position and the upper distance of the tire, and calculate the weight of the balance block according to the position of the balance block attached to the tire.

[0069] The automobile tire assembly dynamic balance test device disclosed in the embodiment of the present invention generates a linear light spot on the inner side of the rim through two linear laser beams, and then calculates the inner contour of the rim by acquiring the image of the linear light spot. The loading component 500 is also provided to lift the tire assembly, so that when detecting the dynamic balance, the material can be loaded quickly and the dynamic balance block mounting position can be automatically pointed out, thereby improving the convenience of tire dynamic balance detection.

[0070] Specifically, in this embodiment, the body shell 100 is a box structure in the prior art, the display panel 110 and the operation panel 120 are fixedly connected to the upper end of the body shell 100, the display panel 110 is tilted, and a storage box 130 is also provided on the display panel 110, and the storage box 130 is used to store dynamic balancing blocks.

[0071] The main shaft 200 is rotatably connected to the body shell 100, one end of the main shaft 200 is located in the body shell 100, and the other end of the main shaft 200 is provided with an external thread. The main shaft 200 and the shaft drive motor 210 are both prior art, and the balance detection component 300 is prior art. The main shaft 200 is installed in the body shell 100 through an axle seat structure, and the main shaft 200 and the balance detection component 300 are installed in the body shell 100 through a mounting bracket 140, and the mounting bracket 140 is fixedly connected to the body shell 100 by bolts. The structure of the main shaft 200 and the balance detection component 300 is not repeated here, and its structure can refer to the dynamic balancing machine in the prior art, such as the structure of a tire balancing test machine with model U-620.

[0072] In this embodiment, the contour detection component 400 includes two groups of linear laser emitters 410 and an image acquisition component 420. The two groups of linear laser emitters 410 are mirror-imaged about the vertical central axis of the body shell 100, and the two linear laser emitters 410 are V-shaped. The linear laser emitters 410 emit linear lasers and irradiate the inner wall of the rim. The image acquisition component 420 is used to collect linear light spots on the inner wall of the rim. The control unit calculates the inner contour size of the rim based on the angle of the linear light spot on the inner wall of the rim and the two light spots located on the same circumference.

[0073] The linear laser emitter 410 is composed of two linear laser emitters. The linear laser emitter 410 is a prior art. For example, the linear laser emitter 410 includes a laser, a collimating lens and a Powell lens. The laser emitted by the laser is shaped into a parallel laser beam by the collimating lens. The laser beam is shaped into a linear laser by the Powell lens. When the linear laser is irradiated onto a plane or onto the inner wall of a cylindrical structure from the inside, a linear light spot is generated, such as Figure 5 Indicated by the double-dotted line;

[0074] In this embodiment, two linear laser emitters are arranged in a V shape, that is, the light curtains formed by the two linear lasers intersect, and the intersection line coincides with the axis of the spindle 200. This arrangement facilitates the calculation of the profile of the rim, such as Figure 6 As shown by the double-dotted lines in the figure, the orthographic projections of the two linear lasers are V-shaped, as shown in Figure 6 The dotted line portion is a circumference of the rim;

[0075] The image acquisition component 420 is installed at a position close to the positioning component 600 through the acquisition bracket 421, so that after the rim is installed, the image acquisition component 420 is located on the inner side of the rim. The image acquisition component 420 is used to acquire the image of the inner wall of the rim. The image acquisition component 420 is located at the center of the two light curtains, that is, when the two linear laser emitters are arranged in a V shape above the main shaft 200, the image acquisition component 420 is located directly above the main shaft 200, the optical axis of the image acquisition component 420 is arranged vertically, and the image acquisition component 420 acquires the image of the rim located on the upper side. When acquiring the image of the rim, the image acquisition component 420 is used to acquire the image of the inner wall of the rim. The image acquisition component 420 is located at the center of the two light curtains, that is, when the two linear laser emitters are arranged in a V shape above the main shaft 200, the image acquisition component 420 is located directly above the main shaft 200, the optical axis of the image acquisition component 420 is arranged vertically, and the image acquisition component 420 acquires the image of the rim located on the upper side. Figure 4 Position settings as shown;

[0076] When calculating the inner contour of the rim, Figures 4 to 6 As shown, the wheel hub is composed of a rim and spokes, and the balance weight is generally fixed on the inner wall of the rim. The current rim manufacturing is processed by integrated stamping. In order to facilitate blanking and matching with the tire, the rim is not cylindrical with a uniform inner diameter, but has a variety of inner diameters and a certain slope inside. Therefore, when the linear laser is irradiated onto the inner wall of the rim, a break line with multiple bends is formed. The image captured by the image acquisition component 420 is as shown in FIG. Figure 5 As shown in the solid line part, when calculating the inner contour of the rim, Figure 5 Collect several points on the solid line part of the , and calculate the radius of the rim by the distance between two points on the same circle on different solid lines. The specific steps are as follows:

[0077] Step S10, acquiring an image of a linear light spot on the rim;

[0078] Step S20, uniformly extracting a number of points on the linear light spot, calculating the distance between two points on the same circumference, and calculating the circumferential radius based on the calculation result and the angle of the linear laser, calculating the distance between two adjacent points on the same light spot, calculating the radius change within the rim based on the circumferential radius and the distance between adjacent points on the same light spot, and drawing the inner contour of the rim based on the radius change of the rim;

[0079] Specifically, Figure 5 and Figure 6 As shown, in the image captured by the image acquisition component 420, an auxiliary line (such as Figure 5 The auxiliary line is perpendicular to the axis of the rim (the specific direction is determined based on the installation position of the image acquisition component 420), and the two intersection points of the auxiliary line and the two linear light spots are on the same circumference, as shown in the dashed line. Figure 5 As shown in the figure, by calculating the number of pixels between point H and point I, and calculating the distance between point H and point I through the functional relationship f(m) between the number of pixels m and the distance between point H and point I (specifically, substituting m into the function f(m) to obtain the value obtained is the required distance), that is, Figure 6 As shown in a, the radius r of the circle where points H and I are located is Wherein, r is the radius of the circle where the points H and I on the rim are located, θ is the angle between the linear laser and the vertical plane, that is, the angle between the laser curtain generated by the linear laser emitter 410 and the vertical plane, that is, the laser emission angle of the linear laser emitter 410;

[0080] It should be noted that, since the installation position of the image acquisition component 420 is above the spindle 200, the focus of the image acquisition component 420 is not on the axis of the spindle 200, and the position of the intersection of the image acquisition component 420 and the axis of the spindle 200 remains unchanged, and the angle between the two linear lasers remains unchanged, and the center of the rim is always on the axis of the spindle 200. For rims of different sizes, the number of pixels of the H point and the I point in the image captured by the image acquisition component 420 has a one-to-one corresponding functional relationship, that is, the functional relationship f(m) between the actual distance between the H point and the I point and the number of pixels. Since the functional relationship f(m) is based on the parameters of the camera, the image acquisition component 420 and the linear The relative position of the laser emitter 410 is related to the relative position of the laser emitter 410. When calculating the functional relationship f(m), a function fitting method can be used for calculation, that is, by setting a number of experimental hubs of different sizes, collecting the H point and the I point on different hubs under the same circumference, and taking the actual distance between the H point and the I point calculated according to the hub size as the dependent variable, and then taking the number of pixels between the H point and the I point as the independent variable, the functional relationship between the independent variable and the dependent variable is calculated by function fitting, so as to obtain the functional relationship between the actual distance between the H point and the I point and the number of pixels m, that is, f(m), wherein f(m) is a linear function, such as f(m)=km+a, wherein k is the proportional coefficient of the actual distance between the H point and the I point and the number of pixels m, and a is the correction coefficient;

[0081] When calculating f(m) by function fitting method, firstly collect the image of linear spot on the experimental wheel hub, and make the following Figure 5 The auxiliary line shown is used to identify the number of pixels m between point H and point I by computer, and the actual distance L between point H and point I is calculated according to the size of the experimental wheel hub. At this time, several sets of data are obtained. The several sets of data are input into MATLAB, and the linear function model f(m)=km+a is defined using fittype. Then, the values ​​of k and a are solved by curve fitting to obtain the function f(m);

[0082] It should be noted that when solving the distance between point H and point I, it can also be implemented through existing programs, such as a program for industrial cameras to recognize the size of objects. Since this program is not an essential feature of the present application, the specific program and algorithm will not be described in detail here.

[0083] After calculating the radius of a circle, the inner contour of the rim can be obtained by calculating the radius of the circle where all the selected points are located. The axial size of the rim can be determined according to the position of the image acquisition component 420. Since the position of the image acquisition component 420 can be actually measured, the positions of the image acquisition component 420 and the positioning component 600 can be calculated, and the wheel hub is positioned by the positioning component 600. Therefore, the position relationship between the position of the image acquisition component 420 and the positioning surface of the rim can be calculated by the actual position of the positioning component 600 and the relative position of the positioning component 600 and the image acquisition component 420. Therefore, the position of the rim in the viewing angle of the image acquisition component 420 is obtained, so that the position relationship between each point on the linear spot and the center position of the image of the image acquisition component 420 can be obtained, and the distribution of the circumference in the axial direction can be calculated by the number of pixels between the two auxiliary lines. Thus, the radius distribution of the rim in the axial direction is calculated, so as to draw the inner contour of the rim. The drawing method is a prior art and will not be repeated here. The specific code can refer to the contour reconstruction technology in the prior art.

[0084] In this embodiment, the relative position of the rim and the image acquisition component 420 in the axial direction can be obtained from the distance between the optical axis and the rim boundary. It should be noted that the image captured by the image acquisition component 420 needs to be corrected to reduce the distortion of the image.

[0085] As a preferred implementation in this embodiment, Figures 7 to 10 As shown, the feeding assembly 500 includes:

[0086] A lifting bracket 510, wherein a V-shaped plate 511 is provided on the lifting bracket 510;

[0087] A lifting cylinder 520 disposed at the bottom of the lifting bracket 510, used to lift the lifting bracket 510;

[0088] Three sets of parallel telescopic clamping parts 530 distributed in an equilateral triangle and rotatably connected to the lifting bracket 510, the telescopic clamping parts 530 include a threaded tube 531 rotatably connected to the V-shaped plate 511 and a threaded rod 532 threadedly connected to the inside of the threaded tube 531, and one end of the threaded rod 532 located outside the threaded tube 531 is fixedly connected to a clamping rod 533 vertically arranged with the threaded rod 532;

[0089] A clamping power part 560 fixedly connected to the V-shaped plate 511 is used to drive the three groups of telescopic clamping parts 530 to rotate synchronously;

[0090] A first clamping portion 540 and a second clamping portion 550, wherein the first clamping portion 540 is fixedly connected to the lifting bracket 510, and the second clamping portion 550 is fixedly connected to the threaded tube 531. When the threaded rod 532 is extended or retracted, the first clamping portion 540 limits the circumferential position of the threaded rod 532. When the rim is clamped, the second clamping portion 550 clamps the threaded rod 532, so that the threaded rod 532 is fixed to the threaded tube 531, and the threaded rod 532 rotates along with the threaded tube 531.

[0091] Specifically, in this embodiment, the loading process of the loading assembly 500 is as follows: after the user places the tire upright at a preset position (such as drawing a line to draw the position where the tire should be placed), the corresponding command (such as fixing the tire) is input through the operation panel 120, and the control unit controls the rotation of the clamping power unit 560, and the clamping power unit 560 drives the three groups of the threaded tubes 531 to rotate. At this time, the first clamping unit 540 is started, and the first clamping unit 540 limits the circumferential position of the threaded rod 532, so that the threaded rod 532 can only move along its axis and cannot rotate. When the threaded tube 531 rotates, the threaded rod 532 is extended, and the clamping rod 533 penetrates into the inner side of the wheel rim. After the threaded rod 532 is extended by a preset distance, the first clamping part 540 releases the threaded rod 532, and the second clamping part 550 clamps the threaded rod 532, so that the threaded rod 532 rotates with the threaded tube 531, and the threaded rod 532 drives the clamping rod 533 to rotate. Since the three groups of clamping rods 533 are distributed in an equilateral triangle, the three groups of clamping rods 533 rotate with the telescopic clamping part 530, and the three groups of clamping rods 533 The three groups of clamping rods 533 rotate synchronously. After the three groups of clamping rods 533 rotate synchronously by a preset angle, the ends of the clamping rods 533 away from the threaded rods 532 can be pressed against the inner wall of the rim, and the ends of the clamping rods 533 apply an outward supporting force to the inner wall of the rim, so that the three groups of clamping rods 533 clamp the tire by applying force outward. After the clamping rods 533 clamp the wheel hub, the lifting cylinder 520 lifts the lifting bracket 510, thereby driving the tire to rise. When the lifting cylinder 520 is lifted to a preset height, the tire is coaxial with the main shaft 200, and the first clamping part 5 40 limits the threaded rod 532, the second clamping part 550 loosens the threaded rod 532, and the threaded tube 531 is reversed under the drive of the clamping power part 560. At this time, the threaded rod 532 retracts, and the clamping rod 533 drives the tire to be installed on the main shaft 200. After the threaded rod 532 retracts to the preset position, the second clamping part 550 loosens the threaded rod 532, and the clamping plate 542 clamps the threaded rod 532. The clamping rod 533 loosens the tire under the drive of the threaded tube 531, and the user can fix the tire through the positioning assembly 600;

[0092] In this embodiment, the V-shaped plate 511 is provided with three groups, and the three groups of V-shaped plates 511 are respectively arranged at both ends of the threaded tube 531 and the first clamping part 540. The V-shaped plates 511 located at both ends of the threaded tube 531 are connected to the threaded tube 531 through bearings 512, so that the threaded tube 531 can rotate on the V-shaped plate 511. The V-shaped plate 511 and the bearing 512 are fixedly connected by interference fit. The V-shaped plate 511 connected to the first clamping part 540 is fixedly connected to the first clamping part 540 by screws. The lifting cylinder 520 is a multi-stage electric lifting structure. The output shaft of the lifting cylinder 520 is fixedly connected to the bearing 512 by bolts. The three groups of V-shaped plates 511 are arranged in parallel, and the axis of the bearing 512 is arranged perpendicular to the V-shaped plate 511.

[0093] The threaded tube 531 is cylindrical with an opening at one end, and an internal thread is provided on the inner side of the threaded tube 531. The threaded rod 532 is a rod-shaped structure with a waist-shaped cross-section, and an external thread is provided on the outer side of the threaded rod 532. One end of the threaded rod 532 is located on the inner side of the threaded tube 531, and a square protrusion is provided on the end of the threaded rod 532 away from the threaded tube 531. One end of the clamping rod 533 is sleeved on the square protrusion, and a threaded column is provided at the end of the square protrusion. A nut is provided on the threaded column, and the nut is used to clamp the clamping rod 533 on the threaded rod 532 When the threaded rod 532 rotates, the clamping rod 533 rotates along with the threaded rod 532. An anti-slip sleeve 534 is further provided at one end of the clamping rod 533 away from the threaded rod 532. The anti-slip sleeve 534 is fixedly connected to the end of the clamping rod 533. The anti-slip sleeve 534 is a rubber pad. The anti-slip sleeve 534 can not only prevent the clamping rod 533 and the inner wall of the rim from slipping, but also increase the contact surface between the clamping rod 533 and the inner wall of the rim, so that the rim clamping is more stable. The anti-slip sleeve 534 is fixedly connected to the clamping rod 533 by gluing or riveting.

[0094] like Fig.11 and Fig.12 As shown, the first clamping portion 540 and the second clamping portion 550 have the same structure, and the first clamping portion 540 includes:

[0095] A limiting wheel 541, wherein the limiting wheel 541 is sleeved on the threaded rod 532, and the shaft hole of the limiting wheel 541 is waist-shaped;

[0096] A clamping plate 542 is arranged outside the limiting wheel 541, the clamping plate 542 is an elastic sheet, the clamping plate 542 is a ring with a notch, and threaded holes with different thread directions are arranged at both ends of the clamping plate 542;

[0097] A clamping screw 543, wherein the clamping screw 543 is provided with two sections of external threads with different rotation directions, and the external threads on the clamping screw 543 are respectively connected to the threaded holes at both ends of the clamping plate 542;

[0098] A clamping motor 544, wherein an output end of the clamping motor 544 is fixedly connected to an end of the clamping screw 543;

[0099] A clamping shell 545, the clamping shell 545 is located outside the threaded tube 531, the clamping plate 542 and the clamping screw 543, the clamping motor 544 is fixedly connected to the clamping shell 545, and the clamping shell 545 is fixedly connected to the V-shaped plate 511;

[0100] In this embodiment, the outer shell structure of the second clamping part 550 (corresponding to the clamping outer shell 545 in the first clamping part 540) is fixedly connected to the threaded tube 531 by welding or screw connection. The second clamping part 550 is also provided with a limit wheel 541, a clamping plate 542, a clamping screw 543 and a clamping motor 544. When the threaded rod 532 rotates, the limit wheel 541 rotates following the threaded rod 532. When the limit wheel 541 is braked, the threaded rod 532 can only slide along its axis in the limit wheel 541. Therefore, when the threaded rod 532 needs to be extended or retracted, the first clamping part 540 performs the following actions: the clamping motor 544 in the first clamping part 540 is started to drive the clamping screw 543 connected thereto to rotate, so that the clamping screw 543 drives the end of the clamping plate 542 close to the The clamping plate 542 is retracted to clamp the limiting wheel 541 after the clamping plate 542 is retracted. The clamping plate 542 prevents the limiting wheel 541 from rotating. When the threaded tube 531 continues to rotate, since the threaded rod 532 cannot rotate, the threaded rod 532 can slide under the drive of the thread, so that the threaded tube 531 drives the threaded rod 532 to extend and retract. When it is necessary to clamp the tire, the clamping motor 544 in the first clamping part 540 is turned over to make the clamping plate 542 release the limiting wheel 541, and the clamping motor 544 in the second clamping part 550 rotates forward, so that the clamping plate 542 in the second clamping part 550 clamps the limiting wheel 541. Since the outer shell structure of the second clamping part 550 is fixed to the threaded tube 531, the threaded rod 532 can rotate with the threaded tube 531, thereby driving the clamping rod 533 to clamp the wheel rim.

[0101] In this embodiment, Figure 7 and Figure 8 As shown, the three groups of threaded tubes 531 are connected by a transmission part 570, so that the three groups of threaded tubes 531 rotate synchronously. The transmission part 570 includes:

[0102] A first synchronous wheel 571 fixedly connected to the threaded tube 531, a avoiding wheel 572 fixed to the lifting bracket 510, and a second synchronous belt 573 sleeved on the first synchronous wheel 571, wherein the avoiding wheel 572 is arranged on the upper side of the first synchronous wheel 571 located below, so that the second synchronous belt 573 is sleeved on the first synchronous wheel 571 and is bent into a V shape by the avoiding wheel 572, so that the second synchronous belt 573 can avoid the main shaft 200;

[0103] The first synchronous wheel 571 is fixedly connected to the threaded tube 531 by a key shaft structure or welding, and the avoidance wheel 572 is fixedly connected to the lifting bracket 510 by a bracket structure;

[0104] The clamping power unit 560 includes a stepper motor 561, a driving wheel 562, a driven wheel 563 and a first synchronous belt 564. The stepper motor 561 is fixedly connected to the V-shaped plate 511 by bolts, the driving wheel 562 is fixedly connected to the output shaft of the stepper motor 561, the driven wheel 563 is fixedly connected to the end of one of the threaded tubes 531, and the first synchronous belt 564 is sleeved on the driving wheel 562 and the driven wheel 563. When the stepper motor 561 is powered on and rotated, the stepper motor 561 drives the threaded tube 531 to rotate through the driving wheel 562, the driven wheel 563 and the first synchronous belt 564.

[0105] It should be noted that, in order to identify whether the clamping rod 533 clamps the rim, the stepper motor 561 is also connected to a current detection circuit for detecting the current of the stepper motor 561. When the clamping rod 533 rotates, the current of the stepper motor 561 changes smoothly (due to processing and assembly errors, when the clamping rod 533 rotates, the load of the stepper motor 561 changes within a range). When the clamping rod 533 clamps the rim, the clamping rod 533 cannot continue to rotate, which is equivalent to the stepper motor 561 being stuck. At this time, the current of the stepper motor 561 will increase, and the current change of the stepper motor 561 can be identified by the current detection circuit connected to the stepper motor 561. The control The control unit identifies the current change of the stepper motor 561 through the detection result of the current detection circuit, and thus determines that the clamping rod 533 clamps the wheel rim when identifying that the current of the stepper motor 561 increases sharply. The control unit controls the clamping plate 542 in the first clamping unit 540 to clamp the limit wheel 541, so that the threaded rod 532 cannot rotate. At this time, the stepper motor 561 can stop being energized. When the first clamping unit 540 is braked, the second clamping unit 550 can work synchronously. The first clamping unit 540 and the second clamping unit 550 brake the threaded rod 532 at the same time, which can prevent the threaded rod 532 from rotating and moving axially, thereby effectively preventing the threaded rod 532 from loosening the wheel rim.

[0106] The telescopic length of the threaded rod 532 is determined based on the position of the end of the spindle 200 and the position of the positioning assembly 600 .

[0107] As a preferred implementation in this embodiment, Figure 3 As shown, the positioning assembly 600 includes:

[0108] A positioning cylinder 610 fixedly connected to the spindle 200, the positioning cylinder 610 is a cylindrical structure with openings at both ends, one end of the positioning cylinder 610 is fixed to the spindle 200, and the other end of the positioning cylinder 610 is provided with a positioning ring 613 to match the positioning surface of the hub;

[0109] A positioning block 620 disposed on the spindle 200, wherein the positioning block 620 is in a frustum shape;

[0110] A positioning spring 630 is disposed on the main shaft 200, and two ends of the positioning spring 630 abut against the bottom of the positioning cylinder 610 and the positioning block 620 respectively;

[0111] A fastening nut 640 disposed on the main shaft 200 , wherein the fastening nut 640 is located on a side of the positioning block 620 away from the positioning cylinder 610 ;

[0112] Specifically, in the present embodiment, the positioning cylinder 610 is a cylinder with a large end portion and a small end portion, and the positioning cylinder 610 is divided into a spring groove 611 and a positioning groove 612 from the small end portion to the large end portion, and the positioning spring 630 abuts against the end of the spring groove 611, and the positioning cylinder 610 is fixedly connected to the main shaft 200 by screws or welding, the spring groove 611 is a cylindrical cylinder, and the positioning groove 612 is a conical cylinder, and the spring groove 611 and the positioning groove 612 are an integral structure, and the positioning ring 613 is located at the end of the positioning groove 612 away from the spring groove 611, and the fastening nut 640 is a prior art, and the fastening nut 640 presses the wheel hub onto the positioning ring 613 after being tightened, and the positioning block 620 can adapt to a variety of wheel hubs of different sizes, and at the same time, the positioning spring 630 is provided to press the positioning block 620 onto the wheel hub, thereby playing a role in positioning the wheel hub.

[0113] The laser indicator 700 is a prior art, such as the laser mode of the reference model U-620 balancing machine, which can indicate the position where the balancing weight should be attached through a laser point;

[0114] It should be noted that, when the laser pointer 700 is working, the control unit controls the spindle 200 to work based on the detection result of the balance detection assembly 300, and the spindle driving motor 210 drives the spindle 200 to rotate, so that the unbalanced point of the rim (the position where the balance block needs to be attached) rotates to the position where the laser pointer 700 can illuminate. For example, in this embodiment, the laser pointer 700 is located below the spindle 200, and the low point of the weight of the rim should be located below the spindle 200, so that the laser pointer 700 can point out the position where the balance block needs to be attached.

[0115] When the control unit controls the laser indicator 700 to work, the control unit calculates the position of the balance weight based on the inner contour of the rim. The calculation method is that the balance weight should be attached to a position with a preset size away from the edge of the rim. The setting principle should be set under the knowledge of skilled workers or relevant technicians.

[0116] As a preferred implementation in this embodiment, the test device further includes an automatic nut tightening mechanism (not shown in the figure), the nut tightening mechanism is electrically connected to the control unit, and when the tire is mounted on the spindle 200, the nut tightening mechanism tightens the clamping nut 640, and the nut tightening mechanism is a prior art, such as the nut tightening mechanism includes a nut tightening gun and a linear drive structure, the linear drive structure drives the nut tightening gun to move along a straight line, and the nut tightening gun is provided with a Fig.13The nut sleeve 800 shown is cylindrical with an opening at one end, and a limiting opening penetrating the nut sleeve is provided on the side of the nut sleeve 800, and the limiting opening is connected to the tightening rod on the fastening nut 640 by interference fit, and a rubber pad is provided in the limiting opening, and the nut sleeve 800 is fixedly connected to the output end of the nut tightening gun by a bolt or a flange structure, and the nut tightening gun is fixedly connected to the output end of the linear drive structure, and the trajectory of the nut tightening gun is coaxial with the main shaft 200. When tightening the fastening nut 640, the fastening nut 640 is located in the nut sleeve 800, and the nut tightening gun drives the nut sleeve 800 to rotate, and the linear drive structure drives the nut sleeve 800 to move toward the positioning cylinder 610, so that the fastening nut 640 is tightened on the main shaft 200.

[0117] Example 2

[0118] As one of the embodiments of the present invention, this embodiment further discloses a method for testing the dynamic balance of a vehicle tire assembly. The testing method is implemented based on the vehicle tire assembly dynamic balance testing device described in Embodiment 1. The testing method comprises the following steps:

[0119] Step S10, the control unit controls the loading assembly 500 to clamp the tire and then install the tire on the main shaft 200, and the positioning assembly 600 positions the tire;

[0120] Step S20, the linear laser emitter 410 emits a linear laser and irradiates the inner wall of the rim, the image acquisition component 420 acquires the linear light spot, the control unit calculates the radius of the circle where the light spot is located based on the distance between two light spots on the same circle on the linear light spot, and obtains the inner contour parameters of the rim according to the radius of each circle on the rim;

[0121] Step S30, the control unit starts the main shaft 200 to drive the tire to rotate, and starts the balance detection assembly 300 to measure the dynamic balance of the tire, and displays the weight of the balance weight to be attached on the display panel 110 according to the measurement result, and indicates the position of the balance weight to be attached through the laser indicator 700;

[0122] Specifically, when loading, the user places the tire at the loading position, starts the automobile tire assembly dynamic balance test device described in Example 1, and after the loading assembly 500 clamps the tire, the user releases the tire, and the loading assembly 500 installs the tire on the spindle 200. The control unit detects the inner contour parameters of the rim through the contour detection assembly 400. After the detection is completed, the control unit starts the test program (the test program is the test program of the tire dynamic balance test machine in the prior art). After the measurement is completed, the control unit obtains the measurement result from the balance detection assembly 300, and displays it on the display panel 110, and at the same time controls the laser indicator 700 to indicate the position where the balance block should be attached on the inner side of the rim;

[0123] In this embodiment, the method for the control unit to measure the inner contour of the rim is as shown in Example 1, comprising the following steps:

[0124] Step S10, acquiring an image of a linear light spot on the rim;

[0125] Step S20, uniformly extracting a number of points on the linear light spot, calculating the distance between two points on the same circumference, and calculating the circumferential radius based on the calculation result and the angle of the linear laser, calculating the distance between two adjacent points on the same light spot, calculating the radius change within the rim based on the circumferential radius and the distance between adjacent points on the same light spot, and drawing the inner contour of the rim based on the radius change of the rim;

[0126] The specific test principle and test details are the same as those disclosed in Example 1, and will not be repeated in this example.

[0127] Preferably, in this embodiment, when the laser pointer 700 indicates the position where the balancing weight should be attached, the control unit controls the shaft driving motor 210 to drive the main shaft 200 to rotate, so that the position where the rim needs to be attached to the balancing weight coincides with the light spot of the laser pointer 700;

[0128] Specifically, after obtaining the parameters of the inner contour of the rim, the control unit will identify the inner and outer sides of the rim according to the inner contour of the rim. For example, on the inner side of the rim, the radius of the linear light spot will change sharply, and the outer edge of the rim, i.e., the linear light spot, is close to the end point of the testing device. The position where the dynamic balance block should be attached is on a circle at a preset distance from the outer edge of the rim and is located at the position of dynamic imbalance of the tire. The laser of the laser indicator 700 is irradiated onto the inner wall of the rim directly below the spindle 200. The spindle 200 rotates the dynamic imbalance position of the rim to directly below the spindle 200. The control unit can identify the relative position of the laser indicator 700 and the rim according to the inner contour of the rim and the positioning position, and control the laser indicator 700 to irradiate the position where the balance block should be attached. The working principle of the laser indicator 700 is the existing technology, such as the laser mode of Unite's U-620, which can indicate the position of the balance block to be attached.

[0129] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" and "the" used in the present invention and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0130] It should be understood that although the terms first, second, third, etc. may be used in the present invention to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0131] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dynamic balance measuring device for an automobile tire assembly, comprising a body shell, a main shaft and a balance detection component, wherein the body shell is provided with a display panel for displaying information, the main shaft is driven to rotate by a shaft driving motor located in the body shell, the balance detection component is used to detect the vibration of the main shaft to detect the dynamic balance of the tire, and the part of the main shaft located outside the body shell is provided with a positioning component to fix the tire, characterized in that: The measuring device also includes: A contour detection component provided on the body shell is used to detect the inner contour of the rim. The contour detection component includes two groups of linear laser emitters fixedly connected to the body shell and an image acquisition component. The two groups of linear laser emitters are mirror-imaged about the vertical center axis of the body shell, and the two linear light emitters are V-shaped. The linear light emitters emit linear lasers and irradiate the inner wall of the rim. The image acquisition component is used to collect linear light spots on the inner wall of the rim. The control unit calculates the inner contour of the rim based on the collected linear light spots. A loading assembly is arranged on the body shell, and the loading assembly includes a lifting bracket, a lifting cylinder, three groups of telescopic clamping parts arranged in parallel and distributed in an equilateral triangle, a clamping power part, a first clamping part and a second clamping part. The lifting bracket is located inside the shell, and a V-shaped plate is arranged on the lifting bracket. The lifting cylinder is connected to the shell and the lifting bracket to lift the lifting bracket. The telescopic clamping part includes a threaded tube rotatably connected to the V-shaped plate and a threaded rod connected to the inside of the threaded tube by threads, and one end of the threaded rod located on the outside of the threaded tube is fixedly connected to a clamping rod arranged vertically with the threaded rod. The clamping power part is fixedly connected to the V-shaped plate and drives the three groups of telescopic clamping parts to rotate synchronously. The first clamping part is fixedly connected to the lifting bracket, and the second clamping part is fixedly connected to the threaded tube. When the threaded rod is extended or retracted, the first clamping part limits the circumferential position of the threaded rod , when clamping the wheel rim, the second clamping part clamps the threaded rod so that the threaded rod is fixed to the threaded tube; the threaded rod is a rod-shaped structure with a waist-shaped cross section, the first clamping part comprises a limiting wheel, a clamping plate arranged on the outer side of the limiting wheel, a clamping screw, a clamping motor and a clamping shell, the limiting wheel is sleeved on the threaded rod, the axial hole of the limiting wheel is waist-shaped, the clamping plate is an elastic sheet, the clamping plate is a ring with a notch, two ends of the clamping plate are provided with threaded holes with different thread rotation directions, the clamping screw is provided with two sections of external threads with different rotation directions, the external threads on the clamping screw are respectively connected to the threaded holes at both ends of the clamping plate, the output end of the clamping motor is fixedly connected to the end of the clamping screw, the clamping shell is located on the outer side of the threaded tube, the clamping plate and the clamping screw, the clamping motor is fixedly connected to the clamping shell, and the first clamping part and the second clamping part have the same structure; A laser pointer and a control unit, the control unit is used to control the loading assembly to realize automatic loading, control the spindle and the balance detection assembly to work together to measure the dynamic balance of the tire, control the spindle and the laser pointer to work together to indicate the position of the balance weight to be attached on the inner contour and the dynamic balance detection result to display the weight of the balance weight to be attached on the display panel; wherein, The three groups of threaded tubes are connected by a transmission part, so that the three groups of threaded tubes rotate synchronously. The transmission part includes a first synchronous wheel fixedly connected to the threaded tube, a avoidance wheel fixed to the lifting bracket, and a second synchronous belt sleeved on the first synchronous wheel. The avoidance wheel is arranged on the upper side of the first synchronous wheel located below, so that the second synchronous belt is sleeved on the first synchronous wheel and bent into a V shape by the avoidance wheel, so that the second synchronous belt avoids the main shaft, and the clamping power part drives one of the threaded tubes to rotate; The positioning assembly includes a positioning cylinder fixedly connected to the main shaft, a positioning block arranged on the main shaft, a positioning spring arranged on the main shaft and a fastening nut arranged on the main shaft. The positioning cylinder is a cylindrical structure with openings at both ends. One end portion of the positioning cylinder is fixed to the main shaft, and a positioning ring is arranged at the other end of the positioning cylinder to cooperate with the positioning surface of the wheel hub. The positioning block is frustum-shaped, and both ends of the positioning spring respectively abut the bottom of the positioning cylinder and the positioning block, and the fastening nut is located on the side of the positioning block away from the positioning cylinder.

2. A method for measuring the dynamic balance of a vehicle tire assembly, which is based on the vehicle tire assembly dynamic balance measuring device according to claim 1 to achieve the measurement of the dynamic balance of the vehicle tire, characterized in that: The following steps are involved: The feeding assembly clamps the tire and then mounts the tire on the main shaft, and the positioning assembly positions the tire; The linear light emitter emits a linear laser and irradiates the inner wall of the rim, the image acquisition component acquires the linear light spot, the control unit calculates the radius of the circle where the light spot is located based on the distance between two light spots on the same circle on the linear light spot, and obtains the inner contour parameters of the rim according to the radius of each circle on the rim; The control unit starts the main shaft to drive the tire to rotate, and at the same time starts the balance detection component to measure the dynamic balance of the tire, and displays the weight of the balance weight to be attached on the display panel according to the measurement result, and indicates the position of the balance weight to be attached through the laser indicator.

3. The method for measuring dynamic balance of a vehicle tire assembly according to claim 2, characterized in that: The method for calculating the rim profile by the control unit comprises the following steps: Step S10, acquiring an image of a linear light spot on the rim; Step S20, evenly extract a number of points on the linear light spot, calculate the distance between two light spots on the same circle, calculate the radius of the circle based on the calculation result and the angle of the linear laser, calculate the distance between two adjacent points on the same light spot, calculate the radius change within the rim based on the radius of the circle and the distance between adjacent points on the same light spot, and draw the inner contour of the rim based on the radius change of the rim.

4. A method for measuring dynamic balance of a vehicle tire assembly according to claim 2, characterized in that: When indicating the position of the balancing weight, the control unit controls the shaft driving motor to drive the main shaft to rotate, so that the position where the rim needs to be close to the balancing weight rotates to the position of the laser indicator spot.

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