Multifunctional testing tool for bicycle rim and testing method thereof

Abstract

The present invention relates to a multifunctional measuring tool for detecting bicycle wheel rims and a detection method thereof. The measuring tool comprises a support platform, a support frame is fixedly installed on the support platform, a plurality of supporting arms are arranged on the supporting frame, each supporting arm is provided with a first positioning mechanism and a second positioning mechanism, when the wheel rim is placed on the supporting frame, the wheel rim is defined by positioning the first positioning mechanism and the second positioning mechanism on the outer side wall and the inner side wall of the wheel rim respectively, the first positioning mechanism is fixedly provided with a first measuring mechanism, the first measuring mechanism contacts the measuring point on the upper surface of the wheel rim, the second positioning mechanism is fixedly provided with a second measuring mechanism, the second measuring mechanism contacts the measuring point on the outer side wall of the wheel rim. The present invention can measure the three indicators of the flatness, true roundness and joint break of the wheel rim, is convenient and quick to operate, and has high measurement accuracy.

Description

Technical Field

[0001] The invention relates to a detection measuring tool, in particular to a multifunctional detection measuring tool for a bicycle wheel rim and a detection method thereof. Background Art

[0002] Bicycle rims are an important part of bicycles. The quality of the rims is directly related to the rider's riding experience. Therefore, the roundness, flatness and seam break of bicycle rims need to be tested before they leave the factory. Currently, three devices are required to perform the above three quality tests separately, which is very inconvenient, time-consuming, and has poor detection accuracy. Summary of the invention

[0003] In order to overcome the above defects, the present invention provides a multifunctional measuring tool for detecting bicycle rims, which can simultaneously detect the roundness, flatness and seam difference of the rims, is very simple to operate, and has high detection accuracy.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A multifunctional measuring tool for detecting bicycle rims comprises a support platform, a support frame is fixedly mounted on the support platform, a plurality of support arms are arranged on the support frame, each support arm is provided with a first positioning mechanism and a second positioning mechanism, when the rim is placed on the support frame, the first positioning mechanism and the second positioning mechanism are used to respectively position the rim on the outer side wall and the inner side wall of the rim to define the rim, a first measuring mechanism is fixedly arranged on the first positioning mechanism, the first measuring mechanism contacts the measuring point on the upper surface of the rim, and a second measuring mechanism is fixedly arranged on the second positioning mechanism, the second measuring mechanism contacts the measuring point on the outer side wall of the rim.

[0006] Preferably, the support platform is in a cylindrical structure, and the support frame is fixedly connected to the central axis of the support platform.

[0007] Preferably, the support frame consists of three arms, one end of the three arms are fixedly connected together, the angle between two adjacent arms is 120°, and the arm is a rectangular aluminum profile arm, and strip grooves are provided on the upper, lower, left and right side walls of the arm.

[0008] Preferably, the first positioning mechanism is fixed in a strip groove on the upper side wall of the support arm, and the second positioning mechanism is fixed in a strip groove on the left side wall or the right side wall of the support arm.

[0009] Preferably, the first positioning mechanism includes a first limit block, a first quick-release handle and a pneumatic ejector pin, the first limit block is connected to the strip groove on the upper side wall of the support arm through the first quick-release handle, the pneumatic ejector pin is fixed on the first limit block and is used to press against the outer side wall of the rim.

[0010] Preferably, the second positioning mechanism includes a second limit block, a second quick-release handle, a limit column, a bearing and a roller, the second limit block is connected to the strip groove on the left side wall or the right side wall of the support arm through the second quick-release handle, the lower end of the limit column is fixed on the second limit block, the roller is rotatably connected to the upper end of the limit column through a bearing, and the roller is used to lean against the inner wall of the rim.

[0011] Preferably, the first measuring mechanism includes a first base and a first digital dial indicator, the first base is fixed on a first positioning mechanism, and the first digital dial indicator contacts the measuring point on the upper surface of the rim, and the second measuring mechanism includes a second base and a second digital dial indicator, the second base is fixed on a second positioning mechanism, and the second digital dial indicator contacts the measuring point on the outer side wall of the rim.

[0012] Preferably, the first base is a magnetic base, and the first measuring mechanism also includes a first support rod and a second support rod, the first support rod is vertically fixed on the first base, the second support rod is vertically connected to the first support rod through an adjusting clamp, the first digital dial indicator is vertically arranged on the second support rod, and a first measuring rod is provided at the lower end of the first digital dial indicator, and the lower end of the first measuring rod contacts the measuring point on the upper surface of the rim.

[0013] Preferably, the second base is a magnetic base, and the second measuring mechanism also includes a third support rod and a fourth support rod, the third support rod is vertically fixed on the second base, the fourth support rod is vertically connected to the third support rod through an adjusting clamp, the second digital dial indicator is horizontally arranged on the fourth support rod, and the front end of the second digital dial indicator is provided with a second measuring rod and a roller, the second measuring rod is fixedly provided with a connecting head, the roller is rotatably arranged on the connecting head through a rotating shaft, and the roller contacts the measuring point of the outer wall of the rim.

[0014] The present invention also provides a detection method of a bicycle wheel rim multifunctional detection measuring tool, the steps of which are as follows:

[0015] Step 1: Adjust the first positioning mechanism and the second positioning mechanism respectively so that there is a certain distance between them, and then place the wheel rim to be tested between the first positioning mechanism and the second positioning mechanism;

[0016] Step 2: adjusting the first positioning mechanism so that the air pressure ejector pin of the first positioning mechanism presses against the outer wall of the wheel rim, and adjusting the second positioning mechanism so that the roller of the second positioning mechanism presses against the inner wall of the wheel rim, thereby limiting the wheel rim;

[0017] Step 3: Adjust the position of the first measuring mechanism so that the first measuring rod of the first digital dial indicator is vertically positioned on the turning plane of the upper surface of the wheel rim; adjust the position of the second measuring mechanism so that the roller of the second digital dial indicator is horizontally positioned on the arc surface of the outer side wall of the wheel rim;

[0018] Step 4: After rotating the wheel rim for one circle, read the values ​​of the first digital dial indicator and the second digital dial indicator to obtain the flatness and roundness values ​​of the wheel rim;

[0019] Step 5: Rotate the rim's seam point to the second measuring mechanism, make the roller of the second digital dial indicator contact one side of the seam point, and then rotate the rim so that the rim's seam point passes through the roller. The rim's seam break value can be measured based on the digital value displayed on the second digital dial indicator.

[0020] The beneficial effects of the present invention are:

[0021] 1) The present invention comprises a support frame, a first positioning mechanism, a second positioning mechanism, a first measuring mechanism and a second measuring mechanism, wherein the support frame is used to support the wheel rim, the first positioning mechanism and the second positioning mechanism are used to limit the wheel rim and ensure that the wheel rim does not shake while rotating smoothly, the first measuring mechanism and the second measuring mechanism are respectively positioned on the upper surface of the wheel rim and the outer side wall of the wheel rim and are used to measure the roundness, flatness and seam break of the wheel rim, so the roundness, flatness and seam break of the wheel rim can be measured synchronously by using the present invention, which is convenient to operate, improves the detection efficiency and enhances the measurement accuracy;

[0022] 2) In the present invention, the first limit block and the second limit block are fixed by a quick-release handle, and are combined with an aluminum profile support arm, so that the positions of the first limit block and the second limit block on the support arm can be conveniently adjusted to meet the measurement requirements of rims of different specifications, and the aluminum profile support arm has the characteristics of heat resistance, non-deformation and light weight;

[0023] 3) In the present invention, a pneumatic ejector pin and a bearing roller are respectively positioned on the outer wall and the inner wall of the wheel rim, which is more conducive to the smooth rotation of the wheel rim. A high-precision digital dial indicator is used as a digital display tool with high measurement accuracy, which can reach 0.01mm, and the roundness, flatness and seam break are quantified 100% for easy control. The present invention has a simple structure, is easy to operate, and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0026] In the figure: 10-support platform, 20-support frame, 21-support arm, 22-strip groove, 30-first positioning mechanism, 31-first limit block, 32-first quick release handle, 33-pneumatic ejector pin, 40-second positioning mechanism, 41-second limit block, 42-second quick release handle, 43-limit column, 44-bearing, 45-roller, 50-first measuring mechanism, 51-first base, 52-first support rod, 53-second support rod, 54-first digital display dial indicator, 55-first measuring rod, 60-second measuring mechanism, 61-second base, 62-third support rod, 63-fourth support rod, 64-second digital display dial indicator, 65-second measuring rod, 66-connector, 67-rotating shaft, 68-roller, 70-rim, 71-rim outer side wall, 72-rim inner side wall, 73-rim upper surface. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of 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.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0030] Example: Figure 1-2 As shown, a multifunctional measuring tool for detecting bicycle rims includes a support platform 10, a support frame 20 is fixedly installed on the support platform 10, a plurality of support arms 21 are provided on the support frame 20, and a first positioning mechanism 30 and a second positioning mechanism 40 are provided on each support arm 21. When a wheel rim 70 is placed on the support frame 20, the first positioning mechanism 30 and the second positioning mechanism 40 are used to respectively position the wheel rim outer wall 71 and the wheel rim inner wall 72 to define the wheel rim, a first measuring mechanism 50 is fixedly provided on the first positioning mechanism 30, and the first measuring mechanism 50 contacts the measuring point of the wheel rim upper surface 73, and a second measuring mechanism 60 is fixedly provided on the second positioning mechanism 40, and the second measuring mechanism 60 contacts the measuring point of the wheel rim outer wall 71.

[0031] The present invention includes a support frame 20, a first positioning mechanism 30, a second positioning mechanism 40, a first measuring mechanism 50 and a second measuring mechanism 60. After the wheel rim 70 is placed on the support frame 20, multiple sets of first positioning mechanisms 30 and second positioning mechanisms 40 are used to clamp the wheel rim from the outer and inner sides of the wheel rim, respectively, so that the wheel rim can rotate smoothly without shaking. Then, the first measuring mechanism 50 and the second measuring mechanism 60 are adjusted so that the two are in contact with the measuring points on the upper surface and the outer side wall of the wheel rim, respectively, that is, the first measuring mechanism 50 is vertically positioned on the upper surface of the wheel rim. On the cut plane, the second measuring mechanism 60 is horizontally positioned on the arc surface of the outer side wall of the wheel rim, and the wheel rim 70 is rotated one circle, and the flatness of the wheel rim is measured according to the value displayed on the first measuring mechanism 50, and the roundness of the wheel rim is measured according to the value displayed on the second measuring mechanism; finally, the seam point of the wheel rim is rotated to the second measuring mechanism 60, so that the second measuring mechanism 60 contacts one side of the seam point, and then the wheel rim is rotated so that the contact point between the wheel rim and the measuring mechanism rotates from one side of the seam point to the other side, and the seam break value of the wheel rim can be measured according to the digital display value on the second measuring mechanism 60. Therefore, the present invention can be used to measure the three indicators of the flatness, roundness and seam break of the wheel rim, and the operation is convenient and fast, and the measurement accuracy is high.

[0032] The support platform 10 is a cylindrical structure, and the support frame 20 is fixedly connected to the central axis of the support platform 10. The support platform 10 is an iron platform, and the upper and lower planes of the support platform are high-flatness positioning reference planes processed by CNC to ensure the detection accuracy of the present invention. In this embodiment, the support frame 20 is composed of three arms 21, one end of the three arms 21 is fixedly connected together, and the angle between two adjacent arms 21 is 120°. The arm 21 is a rectangular aluminum profile arm, and the upper, lower, left and right four side walls of the arm 21 are all provided with strip grooves 22. The support frame 20 is placed on the support platform 10, and the connection of the three arms 21 is fixed to the central axis of the support platform.

[0033] The first positioning mechanism 30 is fixed in the strip groove 22 on the upper side wall of the support arm 21 , and the second positioning mechanism 40 is fixed in the strip groove 22 on the left side wall or the right side wall of the support arm 21 .

[0034] Specifically: Figure 2As shown, the first positioning mechanism 30 includes a first limit block 31, a first quick release handle 32 and a pneumatic ejector pin 33. The first limit block 31 is connected to the strip groove 22 on the upper side wall of the support arm 21 through the first quick release handle 32. The pneumatic ejector pin 33 is fixed on the first limit block 31 and is used to abut against the outer side wall 71 of the wheel rim. The pneumatic ejector pin 33 is fixed on the side of the first limit block 31 close to the wheel rim. The first limit block 31 can be quickly locked on the support arm 21 or unlocked by adjusting the first quick release handle 32. When the first limit block 31 is released, the first limit block 31 can slide forward and backward along the strip groove 22 to meet the testing requirements of wheel rims of different sizes. The pneumatic ejector pin 33 is used to limit the wheel rim 70, which can better ensure the smoothness of the wheel rim rotation without shaking.

[0035] Specifically: Figure 2 As shown, the second positioning mechanism 40 includes a second limit block 41, a second quick-release handle 42, a limit column 43, a bearing 44 and a roller 45. The second limit block 41 is connected to the strip groove 22 on the left side wall or the right side wall of the support arm through the second quick-release handle 42, the lower end of the limit column 43 is fixed on the second limit block 41, and the roller 45 is rotatably connected to the upper end of the limit column 43 through the bearing 44, and the roller 45 is used to abut against the inner wall 72 of the wheel rim. The first limit block 31 and the second limit block 41 are iron limit blocks. The second limit block 41 can be quickly locked to the support arm 21 or unlocked by adjusting the second quick-release handle 42. When the second quick-release handle 42 is released, the second limit block 41 can slide back and forth in the strip groove 22 to meet the testing requirements of rims of different sizes. According to the shape of the inner wall 72 of the rim, the roller 45 is used to limit the inner wall of the rim. The bearing is used so that when the rim rotates, the roller rotates together to reduce the friction between the two, which is beneficial to the smooth rotation of the rim. In the present invention, the pneumatic ejector pin and the roller are respectively used to limit the outer wall and the inner wall of the rim, thereby ensuring the smooth rotation of the rim. In addition, the rim will not shake during the rotation, thereby improving the measurement accuracy.

[0036] The first measuring mechanism 50 includes a first base 51 and a first digital dial indicator 54, the first base 51 is fixed on the first positioning mechanism 30, the first digital dial indicator 54 contacts the measuring point of the upper surface 73 of the rim, and the second measuring mechanism 60 includes a second base 61 and a second digital dial indicator 64, the second base 61 is fixed on the second positioning mechanism 40, and the second digital dial indicator 64 contacts the measuring point of the outer side wall 71 of the rim.

[0037] Specifically: Figure 2As shown, the first base 51 is a magnetic base, and the first measuring mechanism 50 also includes a first support rod 52 and a second support rod 53. The first support rod 52 is vertically fixed on the first base 51, and the second support rod 53 is vertically connected to the first support rod 52 through an adjusting clamp. The first digital dial indicator 54 is vertically arranged on the second support rod 53, and a first measuring rod 55 is provided at the lower end of the first digital dial indicator 54. The lower end of the first measuring rod 55 contacts the measuring point of the upper surface 73 of the wheel rim. The first base 51 is a magnetic base, which is attracted to a side wall of the first iron limit block 31, and is easy to assemble. The first support rod 52 is arranged vertically with the first base 51, and the second support rod 53 is arranged vertically with the first support rod 52, that is, the first support rod 53 is arranged vertically, and the second support rod 53 is arranged horizontally. The first digital dial indicator is vertically arranged on the second support rod 53. When measuring, the first measuring rod 55 of the first digital dial indicator is vertically positioned on the turning plane of the upper surface of the wheel rim. By adjusting the adjusting clamp, the position of the second support rod in the up-down and left-right directions can be adjusted, that is, the position of the first digital dial indicator 54 in the up-down, left-right directions is adjustable, so it can be suitable for products of different specifications.

[0038] Specifically: Figure 2 As shown, the second base 61 is a magnetic base, and the second measuring mechanism 60 also includes a third support rod 62 and a fourth support rod 63, the third support rod 62 is vertically fixed on the second base 61, and the fourth support rod 63 is vertically connected to the third support rod 62 through an adjusting clamp, the second digital dial indicator 64 is horizontally arranged on the fourth support rod 63, and the front end of the second digital dial indicator 64 is provided with a second measuring rod 65 and a roller 68, the second measuring rod 65 is fixedly provided with a connecting head 66, and the roller 68 is rotatably arranged on the connecting head 66 through a rotating shaft 67, and the roller 68 contacts the measuring point of the outer side wall 71 of the wheel rim. The second base 61 is a magnetic base, which is attracted to a side wall of the second iron limit block 41, and is easy to assemble. The third support rod is arranged vertically with the second base, and the fourth support rod is arranged vertically with the third support rod, that is, the third support rod is arranged vertically, and the fourth support rod is arranged horizontally. The second digital dial indicator 64 is horizontally arranged on the fourth support rod, that is, the roller 68 of the second digital dial indicator is horizontally positioned on the arc surface of the outer side wall 71 of the wheel rim. By adjusting the adjustment clamp, the position of the fourth support rod in the up-down and left-right directions can be adjusted, that is, the position of the second digital dial indicator 54 in the up-down, left-down and right directions is adjustable, so it can be suitable for products of different specifications; a roller 68 is added to the second digital dial indicator 64, through which the roller contacts the wheel rim, and the roller rotates during the rotation of the wheel rim to improve the measurement accuracy of the true roundness of the wheel rim. This structure is ingeniously conceived and highly practical.

[0039] The detection method of the bicycle wheel rim multifunctional detection measuring tool comprises the following steps:

[0040] Step 1: respectively adjust the first positioning mechanism 30 and the second positioning mechanism 40 so that there is a certain distance between them, and then place the wheel rim 70 to be tested between the first positioning mechanism 30 and the second positioning mechanism 40; specifically: loosen the first quick release handle 32, move the first limit block 31 along the strip groove 22 of the support arm 21 toward the outside of the support arm, loosen the second quick release handle 42, and move the second limit block 41 along the strip groove of the support arm toward the inside of the support arm;

[0041] Step 2: Adjust the first positioning mechanism 30 so that the air pressure ejector pin 33 of the first positioning mechanism abuts against the outer side wall 71 of the wheel rim, and adjust the second positioning mechanism 40 so that the roller 45 of the second positioning mechanism abuts against the inner side wall 72 of the wheel rim, so as to limit the wheel rim 70; specifically, move the first limiting block 31 toward the wheel rim until the air pressure ejector pin 33 abuts against the outer side wall 71 of the wheel rim, lock the first quick release handle 32, move the second limiting block 41 toward the wheel rim until the roller 45 abuts against the inner side wall 72 of the wheel rim, lock the second quick release handle 42, and fine-tune the positions of the first positioning mechanism and the second positioning mechanism until the wheel rim can rotate smoothly without shaking;

[0042] Step 3: Adjust the position of the first measuring mechanism 50 so that the first measuring rod 55 of the first digital dial indicator 54 is vertically positioned on the turning plane of the upper surface of the wheel rim; adjust the position of the second measuring mechanism 60 so that the roller 68 of the second digital dial indicator 64 is horizontally positioned on the arc surface of the outer side wall 71 of the wheel rim; specifically: by adjusting the position of the second support rod 53 in the first measuring mechanism in the up-down or left-right direction, the first measuring rod 55 of the first digital dial indicator 54 is just in contact with the measuring point on the upper surface of the wheel rim; by adjusting the position of the fourth support rod 63 in the second measuring mechanism in the up-down or left-right direction, the roller 68 on the second digital dial indicator 64 is just in contact with the measuring point on the outer side wall of the wheel rim;

[0043] Step 4: After rotating the wheel rim for one circle, read the values ​​of the first digital display dial indicator 54 and the second digital display dial indicator 64 to obtain the flatness and roundness values ​​of the wheel rim;

[0044] Step 5: Rotate the rim's seam point to the second measuring mechanism 60, so that the roller 68 of the second digital dial gauge 64 contacts one side of the seam point, and then rotate the rim so that the rim's seam point passes through the roller 68. The rim's seam break value can be measured based on the digital value displayed on the second digital dial gauge 64.

[0045] It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these modifications and improvements all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A multifunctional measuring tool for bicycle wheel rims, characterized by: The invention comprises a support platform (10), a support frame (20) is fixedly mounted on the support platform (10), a plurality of support arms (21) are arranged on the support frame (20), each support arm (21) is provided with a first positioning mechanism (30) and a second positioning mechanism (40), when a wheel rim (70) is placed on the support frame (20), the first positioning mechanism (30) and the second positioning mechanism (40) are respectively positioned on the wheel rim outer wall (71) and the wheel rim inner wall (72) to define the wheel rim, a first measuring mechanism (50) is fixedly arranged on the first positioning mechanism (30), the first measuring mechanism (50) contacts a measuring point on the upper surface (73) of the wheel rim, and a second measuring mechanism (60) is fixedly arranged on the second positioning mechanism (40), the second measuring mechanism (60) contacts a measuring point on the outer wall (71) of the wheel rim; The first measuring mechanism (50) comprises a first base (51) and a first digital dial indicator (54), wherein the first base (51) is fixed on the first positioning mechanism (30), and the first digital dial indicator (54) contacts a measuring point on the upper surface (73) of the wheel rim; the second measuring mechanism (60) comprises a second base (61) and a second digital dial indicator (64), wherein the second base (61) is fixed on the second positioning mechanism (40), and the second digital dial indicator (64) contacts a measuring point on the outer side wall (71) of the wheel rim; The first base (51) is a magnetic base, the first measuring mechanism (50) further comprises a first support rod (52) and a second support rod (53), the first support rod (52) is vertically fixed on the first base (51), the second support rod (53) is vertically connected to the first support rod (52) through an adjustment clamp, the first digital dial indicator (54) is vertically arranged on the second support rod (53), the lower end of the first digital dial indicator (54) is provided with a first measuring rod (55), the lower end of the first measuring rod (55) contacts a measuring point on the upper surface (73) of the wheel rim; The second base (61) is a magnetic base. The second measuring mechanism (60) further comprises a third support rod (62) and a fourth support rod (63). The third support rod (62) is vertically fixed on the second base (61). The fourth support rod (63) is vertically connected to the third support rod (62) through an adjusting clamp. The second digital dial indicator (64) is horizontally arranged on the fourth support rod (63). A second measuring rod (65) and a roller (68) are arranged at the front end of the second digital dial indicator (64). A connecting head (66) is fixed on the second measuring rod (65). The roller (68) is rotatably arranged on the connecting head (66) through a rotating shaft (67). The roller (68) contacts a measuring point on the outer wall (71) of the wheel rim.

2. The multifunctional measuring tool for detecting bicycle rims according to claim 1, characterized in that: The support platform (10) is in the form of a cylindrical structure, and the support frame (20) is fixedly connected to the central axis of the support platform (10).

3. The multifunctional measuring tool for detecting bicycle rims according to claim 1, characterized in that: The support frame (20) is composed of three arms (21), one end of the three arms (21) is fixedly connected together, the angle between two adjacent arms is 120°, the arms (21) are rectangular aluminum profile arms, and the upper, lower, left and right four side walls of the arms (21) are all provided with strip grooves (22).

4. The multifunctional measuring tool for detecting bicycle rims according to claim 3, characterized in that: The first positioning mechanism (30) is fixed in the strip groove (22) on the upper side wall of the support arm (21), and the second positioning mechanism (40) is fixed in the strip groove (22) on the left side wall or the right side wall of the support arm (21).

5. The multifunctional measuring tool for detecting bicycle rims according to claim 4, characterized in that: The first positioning mechanism (30) comprises a first limit block (31), a first quick-release handle (32) and a pneumatic ejector pin (33); the first limit block (31) is connected to the strip groove (22) on the upper side wall of the support arm (21) through the first quick-release handle (32); the pneumatic ejector pin (33) is fixed on the first limit block (31) and is used to abut against the outer side wall (71) of the wheel rim.

6. The multifunctional measuring tool for detecting bicycle rims according to claim 4, characterized in that: The second positioning mechanism (40) comprises a second limiting block (41), a second quick-release handle (42), a limiting column (43), a bearing (44) and a roller (45); the second limiting block (41) is connected to the strip groove (22) on the left side wall or the right side wall of the support arm through the second quick-release handle (42); the lower end of the limiting column (43) is fixed to the second limiting block (41); the roller (45) is rotatably connected to the upper end of the limiting column (43) through the bearing (44), and the roller (45) is used to abut against the inner side wall (72) of the wheel rim.

7. A detection method for a bicycle wheel rim multifunctional detection measuring tool according to any one of claims 1 to 6, characterized in that: Here are the steps: Step 1: respectively adjusting the first positioning mechanism (30) and the second positioning mechanism (40) so that there is a certain distance between them, and then placing the wheel rim (70) to be tested between the first positioning mechanism (30) and the second positioning mechanism (40); Step 2: adjusting the first positioning mechanism (30) so that the air pressure ejector pin (33) of the first positioning mechanism abuts against the outer side wall (71) of the wheel rim, and adjusting the second positioning mechanism (40) so that the roller (45) of the second positioning mechanism abuts against the inner side wall (72) of the wheel rim, thereby limiting the wheel rim (70); Step 3: adjusting the position of the first measuring mechanism (50) so that the first measuring rod (55) of the first digital display dial indicator (54) is vertically positioned on the turning plane of the upper surface of the wheel rim; adjusting the position of the second measuring mechanism (60) so that the roller (68) of the second digital display dial indicator (64) is horizontally positioned on the arc surface of the outer side wall (71) of the wheel rim; Step 4: After the wheel rim is rotated one circle, the values ​​of the first digital display dial indicator (54) and the second digital display dial indicator (64) are read to obtain the flatness and roundness values ​​of the wheel rim; Step 5: The seam point of the wheel rim is rotated to the second measuring mechanism (60), so that the roller (68) of the second digital display dial gauge (64) contacts one side of the seam point, and then the wheel rim is rotated so that the seam point of the wheel rim passes through the roller (68), and the seam break value of the wheel rim can be measured according to the value displayed on the second digital display dial gauge (64).

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