Automatically calibrated wheel dynamic balancing machine and operating method thereof

Abstract

The present invention discloses an automatically calibrated wheel balancing machine and its operating method. Two distance measuring sensors are added to an existing wheel balancing machine to obtain the inclination angle of the balancing shaft of the balancing dynamic shaft (i.e., the angle between the balancing shaft and the horizontal plane). The inclination angle of the balancing shaft is then added to the dynamic balancing calculation to dynamically compensate for the calibration coefficient. This eliminates the need for a complex calibration method to modify the calibration coefficient in the influence coefficient model, allowing the wheel balancing machine to be automatically calibrated in real time to accurately obtain the imbalance amount of the wheel's outer correction surface (i.e., the weight of the balancing block that needs to be added to the inner and outer sides of the wheel hub). This not only reduces the requirements for the balancing shaft material and mechanical equipment during the production process, thereby reducing the production cost of the wheel balancing machine, but also eliminates the need for regular calibration of the wheel balancing machine during use, thereby reducing the cost of using the wheel balancing machine.

Description

Technical Field

[0001] The present invention relates to the technical field of wheel dynamic balancing, and in particular to an automatic calibrated wheel dynamic balancing machine and an operating method thereof. Background Art

[0002] Wheels inevitably have uneven mass distribution due to manufacturing, wear, and tire repairs. When the wheel rotates at high speed, it becomes dynamically unbalanced, causing wheel shake and steering wheel vibration while driving. To avoid this problem, or to eliminate it if it has already occurred, the wheel is dynamically balanced by adding counterweights to correct the balance of each edge. This correction process is called dynamic balancing. Currently, wheel balancing is performed using a wheel balancing machine. The operator removes the wheel from the vehicle and installs it on the balancing machine. The operator manually measures the values ​​required by the balancing machine (such as the distance between the balancing machine and the wheel hub, the hub width, and the hub radius) and enters these values ​​into the balancing machine. The operator presses the start button on the balancing machine, and the wheel rotates at high speed. After the wheel stops rotating, the balancing machine automatically displays the required counterweight weights on the inside and outside of the wheel hub. The operator adds counterweights to the corresponding locations on the wheel based on the displayed results. After the balancing weights are added, the operator presses the start button on the balancing machine again, and the wheel rotates at high speed under the balancing machine. After the wheel stops rotating, if the balancing weights required on the inside and outside of the wheel hub displayed by the balancing machine are both 0, the wheel is balanced. If the balancing weights required on the inside and outside of the wheel hub displayed are other values, the wheel is re-balanced until the balancing weights required on the inside and outside of the wheel hub are both 0.

[0003] Since the wheel balancing machine automatically calculates the wheel deviation value based on the input data, the calibration coefficient of its built-in system model plays a decisive role in the dynamic balancing effect of the dynamic balancing machine. Therefore, the wheel balancing machine needs to be calibrated before leaving the factory. The process of calibrating the wheel balancing machine is the process of reassigning the calibration coefficients in the built-in influence coefficient model of the wheel balancing machine. At present, the calibration methods for wheel balancing machines include permanent calibration, influence coefficient, complex influence coefficient and multivariate linear regression. However, in the course of research, the inventors found that the above calibration methods are all based on the premise that the balancing shaft is parallel to the horizontal plane of the balancing machine. Due to the relatively high technological level of similar foreign wheel balancing machines, the balancing shaft is not prone to deformation and other problems after long-term use. Therefore, once the wheel balancing machine is installed, the problem of the balancing shaft not being parallel to the horizontal plane of the balancing machine will not be considered during later use. However, due to the limitations of the balance shaft material and the level of mechanical equipment processing, wheel balancing machines produced in my country, after a period of use, may experience a situation where the balance shaft itself is not level with the ground due to variables such as processing technology, mechanical wear, shaft deformation, and working environment. This will lead to large errors in the dynamic balancing results. Although recalibrating the wheel balancing machine can solve this problem to a certain extent, the recalibration process requires complex calculations using the above-mentioned calibration method to reassign the calibration coefficients. Therefore, professional after-sales personnel of the wheel balancing machine are required to complete the calibration. If the professional after-sales personnel are unable to recalibrate the wheel balancing machine in a timely manner, the wheel balancing machine will have large errors, which will cause the wheel balancing machine to fail to function properly. Summary of the Invention

[0004] The present invention aims to solve the problem that existing wheel balancing machines require professionals to perform complex calibration regularly to ensure accuracy, and provides an automatically calibrated wheel balancing machine and an operating method thereof.

[0005] To solve the above problems, the present invention is achieved through the following technical solutions:

[0006] An automatic calibrated wheel dynamic balancing machine includes a dynamic balancing host and a dynamic balancing display screen; the dynamic balancing host is connected to the dynamic balancing display screen; the dynamic balancing host is provided with a balancing shaft, which passes through the cabinet of the dynamic balancing host and extends outside the cabinet of the dynamic balancing host; the wheel to be tested is mounted on the balancing shaft outside the cabinet of the dynamic balancing host; a first force sensor and a second force sensor are provided inside the cabinet of the dynamic balancing host; the first force sensor and the second force sensor are located directly below the balancing shaft inside the cabinet of the dynamic balancing host, and the first force sensor is connected to a first support on the balancing shaft. The first and second force sensors are connected to the second support point O1 on the balancing shaft; the output ends of the first force sensor and the second force sensor are connected to the dynamic balancing host; the first distance measuring sensor and the second distance measuring sensor are provided on the outside of the cabinet of the dynamic balancing host; the first distance measuring sensor and the second distance measuring sensor are located directly below the balancing shaft on the outside of the cabinet of the dynamic balancing host, the first distance measuring sensor points to the first distance measuring point P1 on the balancing shaft, and the second distance measuring sensor points to the second distance measuring point P2 on the balancing shaft; the output ends of the first distance measuring sensor and the second distance measuring sensor are connected to the dynamic balancing host.

[0007] In the above scheme, an L-shaped central reinforcement rib is provided in the dynamic balancing host cabinet; the central reinforcement rib is located in the center of the inner cavity of the dynamic balancing host cabinet, the rotating shaft of the balancing shaft is installed on the vertical arm of the reinforcement rib, and the first force sensor and the second force sensor are fixed on the horizontal arm of the reinforcement rib.

[0008] In the above scheme, long horizontal and vertical reinforcing ribs are provided in the dynamic balancing host cabinet; the horizontal reinforcing ribs are fixed on the side walls of the dynamic balancing host cabinet and extend horizontally; the vertical reinforcing ribs are fixed on the side walls of the dynamic balancing host cabinet and extend vertically.

[0009] In the above solution, a camera is provided on the outer surface of the cabinet of the dynamic balancing host computer close to the wheel to be tested. The camera is located directly above the balancing shaft and points to the rim of the wheel hub to be tested.

[0010] A method for operating an automatic calibrated wheel balancing machine comprises the following steps:

[0011] Step 1: The first distance sensor sends the vertical distance h1 measured between the first distance sensor and the first distance measuring point P1 of the balancing shaft to the dynamic balancing host, and the second distance sensor sends the vertical distance h2 measured between the second distance sensor and the second distance measuring point P2 of the balancing shaft to the dynamic balancing host; the first force sensor sends the force X1 measured at the first support point O1 of the balancing shaft to the dynamic balancing host, and the second force sensor sends the force X2 measured at the second support point O2 of the balancing shaft to the dynamic balancing host;

[0012] Step 2: The dynamic balancing machine calculates the inclination angle θ of the balancing shaft of the balancing dynamic shaft:

[0013]

[0014] Step 3: The dynamic balancing machine calculates the unbalance U1 of the outer correction surface and the unbalance U2 of the inner correction surface of the wheel to be tested:

[0015]

[0016] Wherein, θ is the inclination angle of the balancing shaft, h1 is the vertical distance between the first distance sensor and the first distance measuring point P1, h2 is the vertical distance between the second distance measuring sensor and the second distance measuring point P2, T is the distance between the first distance measuring sensor and the first distance measuring sensor; U1 is the imbalance of the outer correction surface of the wheel to be measured, U2 is the imbalance of the inner correction surface of the wheel to be measured, a is the horizontal projection distance from the support point O1 on the balancing shaft to the inner edge cross section of the wheel hub, b is the hub width of the wheel, c is the axial distance between the two support points O1 and O2 on the balancing shaft, ω is the angular velocity of the balancing shaft, X1 is the force at the first support point O1 of the balancing shaft, X2 is the force at the second support point O2 of the balancing shaft, and K1 and K2 are the calibration coefficients calibrated by the wheel balancing machine when it leaves the factory.

[0017] In step 3 above, the horizontal projection distance a from the support point O1 on the balancing shaft to the inner edge cross section of the wheel hub is:

[0018] a=a0+a1

[0019] Where a0 is the horizontal projection distance from the support point O1 on the balance shaft to the camera, and a1 is the horizontal projection distance from the camera to the rim of the wheel hub to be tested.

[0020] Compared with the prior art, the present invention takes into account variables such as processing technology, mechanical loss, shaft deformation, and working environment, which may cause the balancing shaft itself to be uneven with the ground. By adding two distance measuring sensors to the existing wheel balancing machine, the inclination angle of the balancing shaft (i.e., the angle between the balancing shaft and the horizontal plane) is obtained. The inclination angle of the balancing shaft is added to the dynamic balancing calculation to dynamically compensate for the calibration coefficient. This eliminates the need for complex calibration methods to modify the calibration coefficient in the influence coefficient model, and allows the wheel balancing machine to be automatically calibrated in real time to obtain the accurate imbalance of the outer correction surface of the wheel (i.e., the weight of the balancing block that needs to be added to the inner and outer sides of the wheel hub). This not only reduces the requirements for the balancing shaft material and mechanical equipment during the production process, reducing the production cost of the wheel balancing machine, but also eliminates the need for regular calibration of the wheel balancing machine during use, reducing the cost of using the wheel balancing machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the dynamic balancing support structure of the wheel dynamic balancing machine.

[0022] Figure 2 A schematic diagram of an automatically calibrated wheel balancing machine.

[0023] Figure 3 Schematic diagram for measuring the tilt angle θ of the balance shaft.

[0024] Numbers in the figure: 1. Dynamic balancing host; 2. Dynamic balancing display screen; 3. Balancing shaft; 4. Wheel; 5. First force sensor; 6. Second force sensor; 7. First distance sensor; 8. Second distance sensor; 9. Camera; 10. Central reinforcement rib; 11. Ground. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to specific examples.

[0026] The dynamic balance support structure of the wheel balancer is as follows: Figure 1 As shown. A wheel is mounted on a balancing shaft 3. The black dots on the outer and inner sides of the wheel hub represent the locations where the balancing weights are added. The outer side of the wheel hub is the outer correction plane, and the inner side of the wheel hub is the inner correction plane. Two points on the balancing shaft 3 are designated as support points, O1 and O2. Two force sensors, a first force sensor 5 and a second force sensor 6, are mounted on these support points, respectively. m1 and m2 are the unbalanced masses on the outer and inner correction planes of the wheel, respectively, and are the quantities to be determined. r1 and r2 are the radii of the outer and inner correction planes of the wheel, respectively, representing the distances from the positions of the unbalanced masses m1 and m2 used for correction to the axis of rotation. f1 and f2 are the centrifugal forces generated by the unbalanced masses on the outer and inner correction planes of the wheel, respectively. F1 and F2 are the dynamic pressures on the outer and inner correction planes of the wheel, respectively, measured by two internal force sensors under the balancing shaft 3. ω is the known angular velocity of the balancing shaft 3.

[0027] According to the principles of mechanics, in the dynamic balancing calculation process, a, b and c all refer to horizontal projection distances, that is, a is the horizontal projection distance from the support point O1 on the balancing shaft 3 to the inner edge cross-section of the wheel hub, b is the horizontal projection distance between the outer correction plane and the inner correction plane of the wheel, and c is the horizontal projection distance between the two support points O1 and O2 on the balancing shaft 3.

[0028] In real-world scenarios, since the balancing shaft 3 from the support point O1 to the cross-section of the inner edge of the wheel hub is partially inside the cabinet of the dynamic balancing machine 1 and partially outside the cabinet of the dynamic balancing machine 1, the axis distance cannot be measured using the built-in measuring ruler of the wheel balancing machine. Therefore, when measuring a, the existing technology first uses the built-in measuring ruler of the wheel balancing machine to measure the distance from the support point O1 to the center of the through-hole of the balancing shaft 3 on the outer side of the cabinet of the dynamic balancing machine 1 near the side of the wheel 4 to be measured, and then uses the built-in measuring ruler of the wheel balancing machine to measure the horizontal projection distance from the center of the through-hole of the balancing shaft 3 on the outer side of the cabinet of the dynamic balancing machine 1 near the side of the wheel 4 to be measured to the rim of the wheel hub, and then adds the two together to obtain the required a. This measurement method ensures that the a obtained for the balancing shaft 3 is the same in both horizontal and tilted states.

[0029] In a real scenario, b is the horizontal projection distance between the outer correction plane and the inner correction plane of the wheel, that is, the hub width of the wheel, and its value does not change when the balancing shaft 3 is in both horizontal and tilted states.

[0030] In real-world scenarios, since the balancing shaft 3 between support points O1 and O2 is located inside the cabinet of the dynamic balancing machine 1, and the existing technology does not consider the issue of shaft parallelism, the existing technology directly uses the measuring ruler built into the wheel balancing machine to measure the length of the balancing shaft 3 between the two support points O1 and O2, that is, the axial distance between the two support points O1 and O2 on the balancing shaft 3 as the c required for dynamic balancing calculation. This measurement method results in different c values ​​when the balancing shaft 3 is horizontal and tilted.

[0031] Based on this structure, according to the principle of statics, the force system in the figure should satisfy the equilibrium condition of zero torque. Taking the torque of the support points O1 and O2 in the figure respectively, we have:

[0032]

[0033] f1 and f2 are the centrifugal forces generated by the unbalanced masses on the outer and inner correction planes of the wheel, respectively:

[0034]

[0035] Here, the unbalance U1 and U2 of the two correction surfaces are expressed as:

[0036]

[0037] Assume that the signals collected by the two force sensors are X1 and X2 respectively, then:

[0038]

[0039] In this way, formula (1) can be written as:

[0040]

[0041] It can be seen from formula (5) that the imbalance U1 and U2 of the two correction planes can be obtained based on the signals X1 and X2 of the two force sensors by only calculating K1 and K2, where K1 and K2 are the calibration coefficients calibrated by the wheel balancing machine when it leaves the factory.

[0042] Subtract the following formula from the above formula in formula (5), and we get:

[0043] c(K1X1+K2X2)=cU2ω 2 +cU1ω 2 (6)

[0044] Right now:

[0045] U1=(K1X1+K2X2) / ω2-U2 (7)

[0046] Substituting formula (7) into formula (5) yields:

[0047]

[0048] When the balancing shaft 3 is actually parallel to the ground 11, the sum of the axial distance c between the two support points O1 and O2 on the balancing shaft 3 and the horizontal distance a from the support point O1 on the balancing shaft 3 to the wheel hub, i.e., (a+c), is the moment arm for the centrifugal force f1 generated by the unbalanced mass on the inner correction plane of the wheel. The sum of the axial distance c between the two support points O1 and O2 on the balancing shaft 3, the wheel hub width b, and the horizontal distance a from the support point O1 on the balancing shaft 3 to the wheel hub, i.e., (a+b+c), is the moment arm for the centrifugal force f2 generated by the unbalanced mass on the outer correction plane of the wheel. However, when the balancing shaft 3 is not actually parallel to the ground 11, there will be an angle θ difference between the axial distance between the two support points O1 and O2 on the balancing shaft 3 obtained by actual measurement and the horizontal projection distance between the two support points O1 and O2 on the balancing shaft 3 required during the dynamic balancing calculation. Therefore, this difference must be taken into account for dynamic compensation to calculate the actual imbalance U1 and U2 on the inner and outer correction planes, namely:

[0049]

[0050] Based on the above analysis, the present invention proposes an automatic calibration wheel dynamic balancing machine, such as Figure 2As shown, it includes a dynamic balancing host 1 and a dynamic balancing display screen 2; the dynamic balancing host 1 is connected to the dynamic balancing display screen 2; the dynamic balancing host 1 is provided with a balancing shaft 3, which passes through the cabinet of the dynamic balancing host 1 and out of the cabinet of the dynamic balancing host 1, and the wheel 4 to be tested is installed on the balancing shaft 3 outside the cabinet of the dynamic balancing host 1; the cabinet of the dynamic balancing host 1 is provided with a first force sensor 5 and a second force sensor 6; the first force sensor 5 and the second force sensor 6 are located directly below the balancing shaft 3 in the cabinet of the dynamic balancing host 1, and the first force sensor 5 is connected to the first support point O1 on the balancing shaft 3. Then, the second force sensor 6 is connected to the second support point O2 on the balancing shaft 3; the output ends of the first force sensor 5 and the second force sensor 6 are connected to the dynamic balancing host 1; the first distance measuring sensor 7 and the second distance measuring sensor 8 are provided on the outside of the cabinet of the dynamic balancing host 1; the first distance measuring sensor 7 and the second distance measuring sensor 8 are located directly below the balancing shaft 3 on the outside of the cabinet of the dynamic balancing host 1, the first distance measuring sensor 7 points to the first distance measuring point P1 on the balancing shaft 3, and the second distance measuring sensor 8 points to the second distance measuring point P2 on the balancing shaft 3; the output ends of the first distance measuring sensor 7 and the second distance measuring sensor 8 are connected to the dynamic balancing host 1.

[0051] The horizontal projection distance a from the support point O1 on the balancing shaft 3 to the cross-section of the inner edge of the wheel hub can be obtained by traditional measurement methods. In a preferred embodiment of the present invention, it is automatically obtained in real time by image processing, that is, a camera 9 is added to the outer surface of the cabinet of the dynamic balancing host 1 on the side close to the wheel 4 to be measured. The camera 9 is located directly above the balancing shaft 3 and points to the rim of the hub of the wheel 4 to be measured. The horizontal projection distance a1 from the camera 9 to the rim of the hub of the wheel 4 to be measured is measured by image processing. In this way, the horizontal projection distance a1 measured by the camera 9 is added to the known horizontal projection distance a0 from the support point O1 on the balancing shaft 3 to the camera 9 to obtain the horizontal projection distance a from the support point O1 on the balancing shaft 3 to the cross-section of the inner edge of the wheel hub.

[0052] To enhance the stability of the balancing machine 1 and prevent it from tilting during operation, which could cause the balancing shaft 3 to be non-parallel to the ground 11, the present invention further includes central reinforcing ribs 10, horizontal reinforcing ribs, and vertical reinforcing ribs. The central reinforcing rib 10 is L-shaped and located in the center of the inner cavity of the dynamic balancing machine 1 cabinet. The balancing shaft 3 is mounted on the vertical arm of the reinforcing rib, and the first and second force sensors 5 and 6 are fixed to the horizontal arm of the reinforcing rib. Both the horizontal and vertical reinforcing ribs are elongated. The horizontal reinforcing ribs are fixed to the side walls of the dynamic balancing machine 1 cabinet and extend horizontally, while the vertical reinforcing ribs are fixed to the side walls of the dynamic balancing machine 1 cabinet and extend vertically.

[0053] The method for operating the above-mentioned automatic calibration wheel balancing machine includes the following steps:

[0054] Step 1: The first distance sensor 7 sends the measured vertical distance h1 between the first distance sensor 7 and the first distance measuring point P1 of the balancing shaft 3 to the dynamic balancing host 1, and the second distance sensor 8 sends the measured vertical distance h2 between the second distance sensor 8 and the second distance measuring point P2 of the balancing shaft 3 to the dynamic balancing host 1; the first force sensor 5 sends the measured force X1 at the first support point O1 of the balancing shaft 3 to the dynamic balancing host 1, and the second force sensor 6 sends the measured force X2 at the second support point O2 of the balancing shaft 3 to the dynamic balancing host 1; the camera 9 captures an image of the rim of the wheel hub of the wheel to be tested 4 and sends it to the dynamic balancing host 1;

[0055] Step 2, see Figure 3 The dynamic balancing host 1 calculates the inclination angle θ of the balancing shaft 3 of the balancing dynamic shaft:

[0056]

[0057] Step 3: The dynamic balancing host 1 collects an image of the rim of the hub of the wheel 4 to be tested using the camera 9 and obtains a horizontal projection distance a1 from the camera 9 to the rim of the hub of the wheel 4 to be tested using image processing technology.

[0058] Step 4: Calculate the axial distance a from the support point O1 on the balancing shaft 3 to the inner edge cross section of the wheel hub:

[0059] a=a0+a1

[0060] Step 5: The dynamic balancing host 1 calculates the unbalance U1 of the outer correction surface and the unbalance U2 of the inner correction surface of the wheel 4 to be tested:

[0061]

[0062] Wherein, θ is the calculated inclination angle of the balancing shaft 3. h1 is the vertical distance between the first distance measuring sensor 7 and the first distance measuring point P1, as measured by the first distance measuring sensor 7. h2 is the vertical distance between the second distance measuring sensor 8 and the second distance measuring point P2, as measured by the second distance measuring sensor 8. T is the known distance between the first distance measuring sensor 7 and the first distance measuring sensor 7. U1 is the calculated imbalance of the outer correction surface of the wheel 4 to be tested. U2 is the calculated imbalance of the inner correction surface of the wheel 4 to be tested. a is the calculated horizontal projection distance from the support point O1 on the balancing shaft 3 to the inner edge cross section of the wheel hub. a0 is the known horizontal projection distance from the support point O1 on the balancing shaft 3 to the camera 9, and a1 is the horizontal projection distance from the camera 9 to the rim of the wheel hub of the wheel 4 to be tested, as measured by the camera 9. b is the known wheel hub width. c is the known axial distance between the two support points O1 and O2 on the balancing shaft 3. ω is the known angular velocity of the balancing shaft 3. X1 is the force at the first support point O1 of the balancing shaft 3, as measured by the first force sensor 5. X2 is the force at the second support point O2 of the balancing shaft 3, as measured by the second force sensor 6. K1 and K2 are the calibration coefficients assigned to a given wheel balancing machine at the factory.

[0063] It should be noted that although the embodiments of the present invention described above are illustrative, they are not intended to limit the present invention. Therefore, the present invention is not limited to the above-mentioned specific embodiments. Without departing from the principles of the present invention, any other embodiments obtained by those skilled in the art under the guidance of the present invention are deemed to be within the protection of the present invention.

Claims

1. An automatic calibrated wheel dynamic balancing machine, comprising a dynamic balancing host (1) and a dynamic balancing display screen (2); the dynamic balancing host (1) is connected to the dynamic balancing display screen (2); a balancing shaft (3) is provided on the dynamic balancing host (1), the balancing shaft (3) passes through the inside of a cabinet of the dynamic balancing host (1) and extends outside the cabinet of the dynamic balancing host (1); a wheel (4) to be measured is mounted on the balancing shaft (3) outside the cabinet of the dynamic balancing host (1); a first force sensor is provided inside the cabinet of the dynamic balancing host (1) The first force sensor (5) and the second force sensor (6) are located directly below the balancing shaft (3) in the internal part of the cabinet of the dynamic balancing host (1), the first force sensor (5) is connected to the first support point O1 on the balancing shaft (3), and the second force sensor (6) is connected to the second support point O2 on the balancing shaft (3); the output ends of the first force sensor (5) and the second force sensor (6) are connected to the dynamic balancing host (1); the characteristic is that A first distance measuring sensor (7) and a second distance measuring sensor (8) are provided outside the cabinet of the dynamic balancing host (1); the first distance measuring sensor (7) and the second distance measuring sensor (8) are located directly below the balancing shaft (3) outside the cabinet of the dynamic balancing host (1); the first distance measuring sensor (7) points to a first distance measuring point P1 on the balancing shaft (3), and the second distance measuring sensor (8) points to a second distance measuring point P2 on the balancing shaft (3); output ends of the first distance measuring sensor (7) and the second distance measuring sensor (8) are connected to the dynamic balancing host (1); The dynamic balancing host (1) calculates the unbalance amount U1 of the outer correction surface and the unbalance amount U2 of the inner correction surface of the wheel (4) to be tested based on the vertical distance h1 between the first distance measuring sensor (7) and the first distance measuring point P1 of the balancing shaft (3) measured by the first distance measuring sensor (7), the vertical distance h2 between the second distance measuring sensor (8) and the second distance measuring point P2 of the balancing shaft (3) measured by the second distance measuring sensor (8), the force X1 at the first support point O1 of the balancing shaft (3) measured by the first force measuring sensor (5), and the force X2 at the second support point O2 of the balancing shaft (3) measured by the second force measuring sensor (6), that is: Where θ is the inclination angle of the balance shaft (3), h1 is the vertical distance between the first distance measuring sensor (7) and the first distance measuring point P1, h2 is the vertical distance between the second distance measuring sensor (8) and the second distance measuring point P2, T is the distance between the first distance measuring sensor (7) and the first distance measuring sensor (7); U1 is the imbalance of the outer correction surface of the wheel (4) to be measured, U2 is the imbalance of the inner correction surface of the wheel (4) to be measured, a is the horizontal projection distance from the support point O1 on the balancing shaft (3) to the inner edge cross section of the wheel hub, b is the wheel hub width, c is the axial distance between the two support points O1 and O2 on the balancing shaft (3), ω is the angular velocity of the balancing shaft (3), X1 is the force at the first support point O1 of the balancing shaft (3), X2 is the force at the second support point O2 of the balancing shaft (3), and K1 and K2 are calibration coefficients calibrated when the wheel dynamic balancing machine leaves the factory.

2. The automatic calibrated wheel balancing machine according to claim 1, characterized in that: An L-shaped central reinforcing rib (10) is provided in a cabinet of the dynamic balancing host (1); the central reinforcing rib (10) is located at the center of the inner cavity of the cabinet of the dynamic balancing host (1); the rotating shaft of the balancing shaft (3) is installed on the vertical arm of the reinforcing rib, and the first force sensor (5) and the second force sensor (6) are fixed on the horizontal arm of the reinforcing rib.

3. An automatic calibrated wheel balancing machine according to claim 1 or 2, characterized in that: Long horizontal reinforcing ribs and vertical reinforcing ribs are provided in the cabinet of the dynamic balancing host (1); the horizontal reinforcing ribs are fixed on the side walls of the cabinet of the dynamic balancing host (1) and extend horizontally; the vertical reinforcing ribs are fixed on the side walls of the cabinet of the dynamic balancing host (1) and extend vertically.

4. The automatic calibrated wheel balancing machine according to claim 1, wherein: A camera (9) is provided on the outer surface of the cabinet of the dynamic balancing host (1) on the side close to the wheel (4) to be tested. The camera (9) is located directly above the balancing shaft (3) and points to the rim of the hub of the wheel (4) to be tested.

5. The method for operating an automatic calibration wheel balancing machine according to claim 1, wherein: The steps are as follows: Step 1: The first distance sensor (7) sends the vertical distance h1 measured between the first distance sensor (7) and the first distance measuring point P1 of the balancing shaft (3) to the dynamic balancing host (1); the second distance sensor (8) sends the vertical distance h2 measured between the second distance sensor (8) and the second distance measuring point P2 of the balancing shaft (3) to the dynamic balancing host (1); the first force sensor (5) sends the force X1 measured at the first support point O1 of the balancing shaft (3) to the dynamic balancing host (1); the second force sensor (6) sends the force X2 measured at the second support point O2 of the balancing shaft (3) to the dynamic balancing host (1); Step 2: The dynamic balancing machine (1) calculates the inclination angle θ of the balancing shaft (3) of the balancing dynamic shaft: Step 3: The dynamic balancing host (1) calculates the unbalance amount U1 of the outer correction surface and the unbalance amount U2 of the inner correction surface of the wheel (4) to be tested: In the formula, θ is the inclination angle of the balancing shaft (3), h1 is the vertical distance between the first distance sensor (7) and the first distance point P1, h2 is the vertical distance between the second distance sensor (8) and the second distance point P2, T is the distance between the first distance sensor (7) and the first distance sensor (7); U1 is the imbalance of the outer correction surface of the wheel (4) to be measured, U2 is the imbalance of the inner correction surface of the wheel (4) to be measured, a is the horizontal projection distance from the support point O1 on the balancing shaft (3) to the inner edge cross section of the wheel hub, b is the hub width of the wheel, c is the axial distance between the two support points O1 and O2 on the balancing shaft (3), ω is the angular velocity of the balancing shaft (3), X1 is the force at the first support point O1 of the balancing shaft (3), X2 is the force at the second support point O2 of the balancing shaft (3), and K1 and K2 are calibration coefficients calibrated when the wheel dynamic balancing machine leaves the factory.

6. The method for operating an automatic calibrated wheel balancing machine according to claim 5, wherein: In step 3, the horizontal projection distance a from the support point O1 on the balancing shaft (3) to the inner edge cross section of the wheel hub is: a=a0+a1 Wherein, a0 is the horizontal projection distance from the support point O1 on the balancing shaft (3) to the camera (9), and a1 is the horizontal projection distance from the camera (9) to the rim of the hub of the wheel (4) to be measured.

Images