A segment width detection device for a tire uniformity tester

Abstract

The tire uniformity testing machine section width detection device provided by the application, when it is necessary to adjust to the test section width, the stop swing arm limits the rotation of the combined assembly of the stop chuck, the width adjusting nut, the lower flange and the lower rim, the laser displacement sensor feeds back the position of the stop chuck in real time, the control device controls the lower spindle driving mechanism to drive the rotation of the lower spindle, the lower spindle drives the rotation of the outer threaded sleeve, the relative rotation of the threaded pair between the outer threaded sleeve and the width adjusting nut occurs, at this time, the combined assembly of the stop chuck, the width adjusting nut, the lower flange and the lower rim axially displaces along the outer threaded sleeve, the position of the lower rim changes, and since the position of the upper rim is fixed, the distance between the upper rim and the lower rim changes, thereby achieving section width adjustment. Since the laser displacement sensor is introduced, the uniformity testing machine does not need to be adjusted to the zero section width position, thereby improving the section width adjustment efficiency and simplifying the section width adjustment process.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of tire uniformity detection equipment, and particularly relates to a tire uniformity tester segment width detection device. BACKGROUND

[0002] The tire uniformity tester is a special equipment for automatically detecting the uniformity performance index of a tire. During tire testing, the segment width between the upper wheel rim and the lower wheel rim is changed to lock the tire after clamping, the tire is inflated to the required pressure, the main shaft drives the tire to rotate, the load wheel is driven to rotate, the two-component force sensor is arranged on the load wheel shaft, and then the change of the force acting on the load wheel during tire rotation is detected, the signal output by the sensor is processed and solved by the data acquisition system and the upper computer, and the radial force fluctuation, lateral force fluctuation, taper effect force and angle of the tire are calculated.

[0003] In the prior art, the segment width between the upper wheel rim and the lower wheel rim is changed to achieve the purpose of detecting different section width tires of the same wheel rim. Since the segment width adjustment process of the existing tire uniformity tester is that each time the segment width needs to be adjusted, the lower wheel rim is first adjusted to the zero segment width position, the stop chuck is detected by the zero segment width detection proximity switch, and the zero point is set, and then the segment difference between the target segment width and the zero segment width is adjusted by the main shaft servo motor to rotate the corresponding angle, and the lower wheel rim is adjusted to the target segment width position.

[0004] The main technical defect of the above setting is that the segment width value cannot be fed back in real time, and the segment width must be adjusted to the zero segment width position first, and then adjusted to the target segment width based on the zero point. Therefore, the segment width adjustment takes a long time, which affects the production efficiency of the equipment.

[0005] In addition, it also aggravates the mechanical wear and affects the stability of the equipment. During the test process, the abnormal change of the segment width during the test process cannot be found in time, and there is a safety hazard.

[0006] Therefore, how to improve the segment width adjustment efficiency and simplify the segment width adjustment process is a problem to be solved by those skilled in the art. SUMMARY

[0007] The purpose of the present application is to provide a tire uniformity tester segment width detection device, which can improve the segment width adjustment efficiency and simplify the segment width adjustment process.

[0008] To solve the above technical problems, the present application provides a tire uniformity tester segment width detection device, which comprises:

[0009] A seat body for mounting a tire, the upper end face and the lower end face of the seat body are used for butt joint with the upper wheel rim and the lower wheel rim, respectively;

[0010] An upper wheel rim fixing mechanism for supporting and fixing the upper wheel rim;

[0011] A lower rim lifting mechanism for supporting the lower rim and adjusting the distance between the lower rim and the upper rim, the lower rim lifting mechanism comprising a lower spindle drive mechanism for driving the rotation of a lower spindle, the lower spindle being connected to the bottom of an outer threaded sleeve, the outer surface of the outer threaded sleeve having a threaded region and a non-threaded region, a width adjusting nut having an inner thread at the lower end thereof for mating with the threaded region of the outer threaded sleeve, the upper end surface of the width adjusting nut being clearance fitted with the non-threaded region of the outer threaded sleeve, a lower flange having an inner hole clearance fitted with the non-threaded region of the outer threaded sleeve, the lower end surface of the lower flange being connected to the upper end surface of the width adjusting nut, the lower rim being fixed to the lower flange, a stop chuck being fixed to the lower end surface of the width adjusting nut, and a stop swing arm for limiting the radial rotation of the stop chuck;

[0012] A laser displacement sensor arranged below the stop chuck for real-time feedback of the position of the stop chuck;

[0013] A control device for determining the current segment width value according to the feedback value of the laser displacement sensor and controlling the rotation of the width adjusting nut by the lower spindle drive mechanism to adjust the moving distance of the lower rim, i.e. to adjust the segment width.

[0014] Optionally, the segment width detection device for the tire uniformity tester further comprises a zero-segment-width detection proximity switch for detecting whether the stop chuck reaches the zero-segment-width position.

[0015] Optionally, the segment width detection device for the tire uniformity tester further comprises a lower limit detection proximity switch for detecting whether the stop chuck reaches the maximum segment width.

[0016] Optionally, the segment width detection device for the tire uniformity tester, the control device is further configured to control the lower spindle drive mechanism to stop rotating or reverse rotation when the zero-segment-width detection proximity switch or the lower limit detection proximity switch is in an open state.

[0017] Optionally, the segment width detection device for the tire uniformity tester further comprises a proximity switch bracket for mounting the zero-segment-width detection proximity switch and the lower limit detection proximity switch, the proximity switch bracket being arranged on the side of the lower rim lifting mechanism.

[0018] Optionally, in the tire uniformity testing machine segment width detection device, the upper rim fixing mechanism comprises an upper flange, an upper rotating shaft and an upper rotating shaft driving mechanism, the side of the upper flange is used for connecting the upper rim and the top of the upper flange is fixed on the upper rotating shaft, and the upper rotating shaft driving mechanism is used for driving the upper rotating shaft to make the lower end surface of the upper flange fit the upper end surface of the seat body.

[0019] Optionally, in the tire uniformity testing machine segment width detection device, the stop chuck is provided with a pin hole, and the stop swing arm comprises a swing arm, a cylinder, a first base and a second base, one end of the swing arm is hinged to the first base, the other end of the swing arm is provided with a pin shaft used for clamping with the pin hole, one end of the cylinder is hinged to the second base, and the other end of the cylinder is hinged to the swing arm.

[0020] Optionally, in the tire uniformity testing machine segment width detection device, the lower main shaft driving mechanism comprises a lower main shaft servo motor and a synchronous belt, the lower main shaft is provided with a synchronous pulley, and the synchronous belt is in transmission connection with the output shaft of the lower main shaft servo motor and the synchronous pulley.

[0021] Optionally, in the tire uniformity testing machine segment width detection device, the lower main shaft driving mechanism further comprises a rotary encoder, which is used for controlling the rotation angle and direction of the lower main shaft servo motor according to the feedback data of the control device.

[0022] Optionally, in the tire uniformity testing machine segment width detection device, the width adjusting nut and the lower flange are non-rigidly connected through a plurality of connecting blocks.

[0023] The tire uniformity testing machine segment width detection device has the beneficial effects that:

[0024] The application focuses on introducing a laser displacement sensor, which is arranged below the stop chuck, and the laser irradiates the lower end surface of the stop chuck upward, and the position of the stop chuck is fed back in real time, and the detection is non-contact and does not affect the rotation of the main shaft.

[0025] Since each set of rims has a fixed segment width range, the position of the stop chuck is the same when the rims are at zero segment width, and the position is measured by the laser displacement sensor, and the control device drives the lower main shaft driving motor to move the stop chuck to the target position according to the real-time feedback position of the stop chuck and the position of the stop chuck at zero segment width, that is, the segment width adjustment is completed. The above setting can realize real-time feedback of the current segment width value, improve the segment width adjustment efficiency and simplify the segment width adjustment process. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on the provided drawings.

[0027] Figure 1 A structural schematic view of a segment width detection device for a tire uniformity testing machine provided by the embodiment of the present application;

[0028] Figure 2 A structural schematic view of a segment width detection device for a tire uniformity testing machine provided by the embodiment of the present application (including a seat body, an upper rim fixing mechanism, and a lower rim lifting mechanism);

[0029] Figure 3 A structural schematic view of a segment width detection device for a tire uniformity testing machine provided by the embodiment of the present application (including a seat body and an upper rim fixing mechanism);

[0030] Figure 4 A structural schematic view of a segment width detection device for a tire uniformity testing machine provided by the embodiment of the present application (including a lower rim lifting mechanism provided with a laser displacement sensor);

[0031] Figure 5 A structural schematic view of a segment width detection device for a tire uniformity testing machine provided by the embodiment of the present application (including a lower main shaft driving mechanism).

[0032] In the above figure:

[0033] 1-upper rotating shaft; 2-upper flange; 3-upper rim; 4-seat body; 5-lower rim; 6-lower flange; 7-outer threaded sleeve; 8-width adjusting nut; 9-stopping chuck; 10-stopping swing arm; 11-lower main shaft; 12-synchronous pulley; 13-rotary encoder; 14-lower main shaft servo motor; 15-synchronous belt; 16-laser displacement sensor; 17-proximity switch support; 18-lower limit detection proximity switch; 19-zero segment width detection proximity switch; 20-connection block. DETAILED DESCRIPTION

[0034] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0035] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right and the like, is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0036] In the description of the present application, the meaning of multiple is more than two, and if the first and the second are described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0037] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0038] The core of the present application is to provide a tire uniformity tester segment width detection device, which can improve the segment width adjustment efficiency and simplify the segment width adjustment process.

[0039] In order for those skilled in the art to better understand the technical solutions provided by the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0040] Specifically, please refer to Figures 1-5 , Figure 1 A structure schematic view of a tire uniformity tester segment width detection device provided by an embodiment of the present application; Figure 2 A structure schematic view of a tire uniformity tester segment width detection device provided by an embodiment of the present application (including a seat body, an upper rim fixing mechanism and a lower rim lifting mechanism); Figure 3 A structure schematic view of a tire uniformity tester segment width detection device provided by an embodiment of the present application (including a seat body and an upper rim fixing mechanism); Figure 4 A structure schematic view of a tire uniformity tester segment width detection device provided by an embodiment of the present application (including a lower rim lifting mechanism provided with a laser displacement sensor); Figure 5 A structure schematic view of a tire uniformity tester segment width detection device provided by an embodiment of the present application (including a lower main shaft driving mechanism).

[0041] The tire uniformity tester segment width detection device provided by the present application comprises a seat body 4, an upper rim fixing mechanism, a lower rim lifting mechanism, a laser displacement sensor 16 and a control device.

[0042] The seat body 4 is used for mounting the tire, and the upper end face and the lower end face of the seat body 4 are used for abutting with the upper rim 3 and the lower rim 5 respectively.

[0043] The upper rim fixing mechanism is used for supporting and fixing the upper rim 3.

[0044] The lower rim lifting mechanism is used for supporting the lower rim 5 and adjusting the distance between the lower rim 5 and the upper rim 3. The lower rim lifting mechanism comprises a lower main shaft driving mechanism, a lower main shaft 11, an outer threaded sleeve 7, a width adjusting nut 8, a lower flange 6, a stop chuck 9 and a stop swing arm 10. The lower main shaft driving mechanism is used for driving the lower main shaft 11 to rotate. The lower main shaft 11 is connected with the bottom of the outer threaded sleeve 7. The outer surface of the outer threaded sleeve 7 has a threaded area and a non-threaded area. The inner thread of the lower end of the width adjusting nut 8 is matched with the threaded area of the outer threaded sleeve 7. The upper end face of the width adjusting nut 8 is matched with the non-threaded area of the outer threaded sleeve 7 in clearance. The inner hole of the lower flange 6 is matched with the non-threaded area of the outer threaded sleeve 7 in clearance. The lower end face of the lower flange 6 is connected with the upper end face of the width adjusting nut 8. The lower rim 5 is used for being fixed on the lower flange 6. The stop chuck 9 is fixed on the lower end face of the width adjusting nut 8. The stop swing arm 10 is used for limiting the radial rotation of the stop chuck 9.

[0045] The laser displacement sensor 16 is arranged below the stop chuck 9 and is used for feeding back the position of the stop chuck 9 in real time.

[0046] The control device is used for judging the current segment width value according to the feedback value of the laser displacement sensor 16 and controlling the lower main shaft driving mechanism to drive the width adjusting nut 8 to rotate, so as to realize the adjustment of the moving distance of the lower rim 5, that is, the adjustment of the segment width.

[0047] It should be noted that the present application focuses on introducing the laser displacement sensor 16. The laser displacement sensor 16 is arranged below the stop chuck 9. The laser irradiates the lower end face of the stop chuck 9 upwards and feeds back the position of the stop chuck 9 in real time. Moreover, the detection is non-contact and does not affect the rotation of the lower main shaft 11.

[0048] Since each set of rims has a fixed segment width range, the positions of the stop chucks 9 of all the rims are the same when the segment width is zero. The position is measured by the laser displacement sensor 16. According to the position of the stop chuck 9 fed back in real time and the position of the stop chuck 9 when the segment width is zero, the control device drives the lower main shaft 11 driving motor to move the stop chuck 9 to the target position, that is, completes the segment width adjustment. The above setting can realize the real-time feedback of the current segment width value, improve the segment width adjustment efficiency and simplify the segment width adjustment process.

[0049] The tire uniformity testing machine section width detection device provided by the application, when it is necessary to adjust to the test section width, the stop swing arm 10 limits the rotation of the combined assembly of the stop chuck 9, the width adjusting nut 8, the lower flange 6 and the lower rim 5, the laser displacement sensor 16 feeds back the position of the stop chuck 9 in real time, the control device controls the lower spindle driving mechanism to drive the rotation of the lower spindle 11, the lower spindle 11 drives the rotation of the outer threaded sleeve 7, the threaded pair between the outer threaded sleeve 7 and the width adjusting nut 8 rotates relatively, at this time, the combined assembly of the stop chuck 9, the width adjusting nut 8, the lower flange 6 and the lower rim 5 axially displaces along the outer threaded sleeve 7, the position of the lower rim 5 changes, since the position of the upper rim 3 is fixed, the distance between the upper rim 3 and the lower rim 5 changes, thereby achieving the section width adjustment. Since the laser displacement sensor 16 is introduced, the tire uniformity testing machine does not need to be adjusted to the zero section width position, thereby improving the section width adjustment efficiency and simplifying the section width adjustment process. Meanwhile, mechanical wear can be reduced and abnormalities can be found in time.

[0050] In order to determine whether the lower rim 5 is at the zero section width position, the application further comprises a zero section width detection proximity switch 19 for detecting whether the stop chuck 9 reaches the zero section width position. When the stop chuck 9 approaches the zero section width position, the zero section width detection proximity switch 19 feeds back a signal, and when the stop chuck 9 is away from the zero section width position, the zero section width detection proximity switch 19 has no signal.

[0051] In order to determine whether the lower rim 5 is at the maximum section width position, the application further comprises a lower limit detection proximity switch 18 for detecting whether the stop chuck 9 reaches the maximum section width position. When the stop chuck 9 approaches the maximum section width position, the lower limit detection proximity switch 18 feeds back a signal, and when the stop chuck 9 is away from the maximum section width position, the lower limit detection proximity switch 18 has no signal.

[0052] On the basis of the above specific embodiments, the control device is further used for controlling the lower spindle driving mechanism to stop rotating or reversely rotating when the zero section width detection proximity switch 19 or the lower limit detection proximity switch 18 is in an open state.

[0053] In order to facilitate support, the application further comprises a proximity switch support 17 for mounting the zero section width detection proximity switch 19 and the lower limit detection proximity switch 18, and the proximity switch support 17 is arranged on the side of the lower rim lifting mechanism. The proximity switch support 17 is mainly used for detecting the lifting distance of the stop chuck 9 (and the whole thereof) to limit the section width range of the lower rim 5.

[0054] In a specific embodiment, as shown in Figure 3 The upper rim fixing mechanism comprises an upper flange 2, an upper rotating shaft 1 and an upper rotating shaft driving mechanism, the side of the upper flange 2 is used for connecting the upper rim 3 and the top of the upper flange 2 is fixed to the upper rotating shaft 1, and the upper rotating shaft driving mechanism is used for driving the upper rotating shaft 1 to make the lower end surface of the upper flange 2 fit the upper end surface of the seat body 4.

[0055] In a specific embodiment, as shown in Figure 4 The stop chuck 9 is provided with a pin hole, and the stop swing arm 10 comprises a swing arm, a cylinder, a first base and a second base. One end of the swing arm is hinged to the first base, and the other end is provided with a pin shaft for clamping with the pin hole. One end of the cylinder is hinged to the second base, and the other end is hinged to the swing arm. Of course, the pin hole can be directly replaced by a tooth groove, i.e. a tooth groove is provided on the stop chuck 9, and the pin shaft on the swing arm can be clamped and matched with the tooth groove.

[0056] In a specific embodiment, as shown in Figure 5 The lower spindle driving mechanism comprises a lower spindle servo motor 14 and a synchronous belt 15. The lower spindle 11 is provided with a synchronous pulley 12, and the synchronous belt 15 is drivingly connected between the output shaft of the lower spindle servo motor 14 and the synchronous pulley 12. The lower spindle driving mechanism can specifically adopt a servo motor, i.e. the lower spindle servo motor 14, and of course, other transmission mechanisms can also be adopted.

[0057] Further, the lower spindle driving mechanism further comprises a rotary encoder 13 for controlling the rotation angle and direction of the lower spindle servo motor 14 according to the feedback data of the control device.

[0058] In a specific embodiment, the width adjusting nut 8 and the lower flange 6 are non-rigidly connected through a plurality of connecting blocks 20. The stop chuck 9 and the width adjusting nut 8 are connected through screws, and the lower rim 5 and the lower flange 6 are connected through screws. Further, the stop chuck 9, the width adjusting nut 8, the lower flange 6, the connecting block 20 and the lower rim 5 form an integral whole, and can realize axial displacement along the outer circular surface of the outer threaded sleeve 7.

[0059] Of course, the plurality of connecting blocks 20 are uniformly arranged along the circumference of the lower flange 6, and the number of the connecting blocks 20 can be adaptively selected according to actual conditions, which is not limited further herein.

[0060] In a specific embodiment, as shown in Figures 1-5As shown, the stop chuck 9 is installed on the lower end surface of the width adjusting nut 8, connected by screws, the inner thread of the lower end of the width adjusting nut 8 is in threaded cooperation with the outer thread of the outer threaded sleeve 7, and can rotate relatively, the upper end surface of the width adjusting nut 8 is in clearance fit with the non-threaded area of the outer threaded sleeve 7, and the inner hole of the lower flange 6 is also in clearance fit with the non-threaded area of the outer threaded sleeve 7, the end surface of the width adjusting nut 8 is combined with the end surface of the lower flange 6, and is non-rigidly connected through the four connecting blocks 20, and the lower rim 5 is fixed on the lower flange 6 by screws, so that the stop chuck 9, the width adjusting nut 8, the lower flange 6, the connecting blocks 20 and the lower rim 5 form an integral whole and can be axially displaced along the outer surface of the outer threaded sleeve 7. The upper rim 3 is fixed on the upper flange 2 by screws, and the upper flange 2 is fixed on the upper rotating shaft 1, and when the device is working, the upper rotating shaft 1 is driven by the upper rotating shaft driving mechanism (such as a pneumatic cylinder) to move the upper flange 2 to the seat body 4, the end surface of the upper flange 2 is in close contact with the end surface of the seat body 4 and the position is kept, that is, the position of the upper rim 3 is fixed.

[0061] Segment width adjustment principle: the distance between the upper rim 3 and the lower rim 5 is the segment width, and there are multiple segment widths for the same bead diameter, in order to adapt to the testing needs of different segment width tires, the device needs to have the function of segment width adjustment, when the testing segment width needs to be adjusted, the stop swing arm 10 is inserted into the tooth groove (or pin shaft) of the stop chuck 9 under the push of the swing arm pneumatic cylinder, to limit the rotation of the combination of the stop chuck 9, the width adjusting nut 8, the lower flange 6, the connecting blocks 20 and the lower rim 5, then the main shaft servo motor drives the rotation of the lower main shaft 11, the lower main shaft 11 drives the rotation of the outer threaded sleeve 7, and the threaded pair between the outer threaded sleeve 7 and the width adjusting nut 8 rotates relatively, at this time, the combination of the stop chuck 9, the width adjusting nut 8, the lower flange 6, the connecting blocks 20 and the lower rim 5 axially displaces along the outer threaded sleeve 7, and the position of the lower rim 5 changes, since the position of the upper rim 3 is fixed, the distance between the upper rim 3 and the lower rim 5 changes, thereby achieving segment width adjustment.

[0062] Segment width adjustment process in the prior art: each time the segment width needs to be adjusted, first adjust the lower rim 5 to the zero segment width position, and then according to the segment difference between the target segment width and the zero segment width, the main shaft servo motor rotates by a corresponding angle of 12.7mm / 360° to adjust the lower rim 5 to the target segment width position.

[0063] The present application focuses on introducing a laser displacement sensor 16, which is installed below the stop chuck 9, and the laser irradiates the lower end surface of the stop chuck 9 upward, and the position of the stop chuck 9 is fed back in real time, and it is non-contact detection, and does not affect the rotation of the main shaft. Each set of wheel rim has a fixed segment width range, and the segment width adjustment range of the uniformity tester is 7.5 inches, that is: maximum segment width-minimum segment width (zero segment width)=7.5 inches, and the positions of the stop chuck 9 of all wheel rims are the same when the zero segment width, and this position is measured by the laser displacement sensor 16, which is a fixed parameter A.

[0064] The following illustrates the segment width adjustment process of the new scheme:

[0065] Example 1: The segment width range of a set of wheel rims is 6-13.5 inches, and the current segment width is 6 inches, and now it is adjusted to 8 inches, that is, the target value of the displacement sensor is [A-(8-6)*25.4]mm, and the main shaft servo motor is started to move the stop chuck 9 to the target position, and the segment width adjustment is completed.

[0066] Example 2: The segment width range of a set of wheel rims is 7-14.5 inches, and the current segment width is 12 inches, and now it is adjusted to 9 inches, that is, the target value of the displacement sensor is [A-(9-7)*25.4]mm, and the main shaft servo motor is started to move the stop chuck 9 to the target position, and the segment width adjustment is completed.

[0067] The beneficial effects brought by the technical scheme of the present application include:

[0068] 1. Simplify the segment width adjustment process, directly adjust to the target segment width each time, without returning to the zero segment width position first, and shorten the segment width adjustment time to 1 / 3 on average.

[0069] 2. Reduce mechanical wear and improve equipment stability.

[0070] 3. Real-time feedback of the current segment width value solves the defect of previous unknown abnormal changes in segment width.

[0071] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts of each embodiment can be referred to each other.

[0072] The principles and implementation modes of the present application are described by applying specific examples in this paper. The above description of the embodiments is only used to help understand the method and core idea of the present application. It should be noted that for ordinary skilled persons in the technical field, without departing from the principles of the present application, some improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A segment width detection device for a tire uniformity tester, characterized by, The application relates to a tire testing device, which comprises the following parts: a seat body for mounting a tire, the upper end face and the lower end face of the seat body being used for interfacing with an upper wheel rim and a lower wheel rim respectively; an upper wheel rim fixing mechanism for supporting and fixing the upper wheel rim; a lower wheel rim lifting mechanism for supporting the lower wheel rim and adjusting the distance between the lower wheel rim and the upper wheel rim, the lower wheel rim lifting mechanism comprising a lower main shaft driving mechanism, a lower main shaft, an outer threaded sleeve, a width adjusting nut, a lower flange, a stop chuck and a stop swing arm, the lower main shaft driving mechanism being used for driving the lower main shaft to rotate, the lower main shaft being connected with the bottom of the outer threaded sleeve, the outer surface of the outer threaded sleeve having a threaded area and a non-threaded area, the inner thread of the lower end of the width adjusting nut being matched with the threaded area of the outer threaded sleeve, the upper end face of the width adjusting nut being matched with the non-threaded area of the outer threaded sleeve in clearance, the inner hole of the lower flange being matched with the non-threaded area of the outer threaded sleeve in clearance, the lower end face of the lower flange being connected with the upper end face of the width adjusting nut, the lower wheel rim being used for being fixed on the lower flange, the stop chuck being fixed on the lower end face of the width adjusting nut, and the stop swing arm being used for limiting the radial rotation of the stop chuck; a laser displacement sensor arranged below the stop chuck and used for feeding back the position of the stop chuck in real time; and a control device used for judging the current segment width value according to the feedback value of the laser displacement sensor and controlling the lower main shaft driving mechanism to drive the width adjusting nut to rotate, so as to adjust the moving distance of the lower wheel rim, i.e. to adjust the segment width. The application further comprises a zero-segment-width detection proximity switch used for detecting whether the stop chuck reaches the zero-segment-width position. The application further comprises a lower limit detection proximity switch used for detecting whether the stop chuck reaches the maximum segment width. The control device is further used for controlling the lower main shaft driving mechanism to stop rotating or reversely rotate when the zero-segment-width detection proximity switch or the lower limit detection proximity switch is in the open state. The application further comprises a proximity switch support used for mounting the zero-segment-width detection proximity switch and the lower limit detection proximity switch, and the proximity switch support is arranged on the side of the lower wheel rim lifting mechanism. The upper wheel rim fixing mechanism comprises an upper flange, an upper rotating shaft and an upper rotating shaft driving mechanism, the side of the upper flange is used for connecting the upper wheel rim, the top of the upper flange is fixed on the upper rotating shaft, and the upper rotating shaft driving mechanism is used for driving the upper rotating shaft to make the lower end face of the upper flange fit the upper end face of the seat body.

2. The segment width detection device for a tire uniformity tester according to claim 1, characterized by, The stop chuck is provided with a pin hole, the stop swing arm comprises a swing arm, a cylinder, a first base and a second base, one end of the swing arm is hinged to the first base, the other end of the swing arm is provided with a pin shaft used for clamping the pin hole, one end of the cylinder is hinged to the second base, and the other end of the cylinder is hinged to the swing arm.

3. The segment width detection device for a tire uniformity tester according to claim 2, characterized by, The lower main shaft driving mechanism comprises a lower main shaft servo motor and a synchronous belt, the lower main shaft is provided with a synchronous belt wheel, and the synchronous belt is drivingly connected with the output shaft of the lower main shaft servo motor and the synchronous belt wheel.

4. The segment width detection device for a tire uniformity tester according to claim 3, characterized by, The lower main shaft driving mechanism further comprises a rotary encoder used for controlling the rotation angle and direction of the lower main shaft servo motor according to the feedback data of the control device.

5. The segment width detection device for a tire uniformity tester according to claim 3, characterized by, ​ 6. The segment width detection apparatus for a tire uniformity tester according to claim 1, characterized by, ​ 7. The segment width detection apparatus for a tire uniformity tester according to Claim 1, characterized by, ​ 8. The segment width detection apparatus for a tire uniformity tester according to claim 1, characterized by, ​ 9. The segment width detection apparatus for a tire uniformity tester according to claim 8, characterized by, ​ 10. The segment width detection apparatus for a tire uniformity tester according to claim 1, characterized by, The width-adjusting nut and the lower flange are non-rigidly connected through a plurality of connecting blocks.

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