An electric bicycle frame quality detection device

Abstract

The application belongs to the technical field of electric bicycle production, and discloses an electric bicycle frame quality detection device, which comprises a positioning table, a positioning mechanism and a detection piece, the positioning mechanism is arranged on the positioning table, the positioning mechanism comprises two positioning plugs which are arranged opposite to each other and are spaced apart, further comprising a lifting driving piece, the lifting driving piece can drive the two positioning plugs to approach or move away from each other, the detection piece comprises an adjusting rod, a measuring head, a rotating shaft and a laser emitter, the rotating shaft is fixed to the first end of the adjusting rod and is perpendicular to the adjusting rod, the measuring head is arranged on the second end of the adjusting rod and is used for measuring the length size in the axial direction parallel to the rotating shaft, the laser emitter is fixed to the adjusting rod, a laser mapping head is fixed on the positioning table, and the center line of the laser mapping head and the axis of the two positioning plugs are arranged in line. The electric bicycle frame quality detection device integrates the center degree detection and the fork bone deviation detection functions, effectively improves the detection efficiency, and further guarantees the frame quality.

Description

Technical Field

[0001] This invention relates to the field of electric bicycle manufacturing technology, and in particular to an electric bicycle frame quality testing device. Background Technology

[0002] During the production of electric bicycles, dimensional inspections are required for components such as the frame. The frame houses the front and rear wheels, handlebars, seat, battery, and other components. This necessitates that the shape, dimensions, and precision of each part of the frame meet specific requirements to ensure the electric bicycle performs its intended function and guarantees quality when it comes off the assembly line.

[0003] Frame centering and wishbone misalignment are two important items in frame quality inspection. Specifically, refer to... Figure 1 As shown, the frame 1' includes a front tube 11' and a wishbone 12', where the front wheel 2' is mounted on the front tube 11' and the rear wheel 3' is mounted on the wishbone 12'. The centering detection specifically measures the misalignment deviation between the front wheel 2' and the rear wheel 3' along the width direction of the frame 1'. Figure 1 As shown in parameter a; the wedge offset vector detection specifically detects the distance deviation between the rear wheel 3' of the electric bicycle and the two left and right wedges 12'. Figure 1 See parameters b1 and b2. In the prior art, the centering accuracy and fork skewness detection of frame 1' are performed in two separate steps: first, the centering accuracy is detected using a centering accuracy detection device, and then the fork skewness 12' is detected using a fork skewness skewness gauge. This operation is complicated and inefficient, and it does not take into account the influence of the perpendicularity of the front tube 11' on the overall dimensional accuracy of frame 1', thus affecting the quality inspection results of frame 1'. Summary of the Invention

[0004] The purpose of this invention is to provide an electric bicycle frame quality inspection device that integrates frame centering detection and fork skew detection functions, and takes into account the influence of head tube verticality, effectively improving inspection efficiency and further ensuring frame quality.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] An electric bicycle frame quality inspection device is used to inspect the centering of the frame and the offset of the forks. The frame includes a head tube, a center tube, and two spaced-apart forks. The forks have grooves for mounting wheel axles. The electric bicycle frame quality inspection device includes:

[0007] Positioning station;

[0008] A positioning mechanism is provided on the positioning platform. The positioning mechanism includes two positioning plugs arranged facing each other in a vertical direction, and also includes a lifting drive. The positioning plugs are used to be inserted into the head tube, and the lifting drive can drive the two positioning plugs to move closer or further apart from each other.

[0009] The testing component includes an adjusting rod, a measuring head, a rotating shaft, and a laser emitter. The rotating shaft is fixed to the first end of the adjusting rod and is perpendicular to the adjusting rod. The rotating shaft can be inserted into the shaft groove and rotate relative to the shaft groove. The measuring head is located at the second end of the adjusting rod and is used to measure the length dimension parallel to the axial direction of the rotating shaft. The laser emitter is fixed on the adjusting rod, and a laser mapping head is fixed on the positioning platform. The centerline of the laser mapping head and the axes of the two positioning plugs are collinear.

[0010] Preferably, the laser mapping head includes a first protrusion, a second protrusion, and a third protrusion. The first protrusion is fixed on the positioning platform, the second protrusion is fixed above the first protrusion, and the third protrusion is fixed above the second protrusion. The widths of the first protrusion, the second protrusion, and the third protrusion decrease sequentially in the horizontal direction.

[0011] Preferably, the lifting drive component is configured as a telescopic cylinder, and the positioning plug includes a first positioning plug and a second positioning plug. The first positioning plug is fixed on the positioning platform and located below the second positioning plug. The cylinder body of the telescopic cylinder is fixed on the positioning platform, and the cylinder rod of the telescopic cylinder is fixedly connected to the second positioning plug.

[0012] Preferably, a connecting frame is fixedly provided on the positioning platform, and the cylinder body of the telescopic cylinder and the laser mapping head are both fixed on the connecting frame.

[0013] Preferably, the cylinder rod of the telescopic cylinder is connected to a lifting plate, and the second positioning plug is fixed to the lifting plate.

[0014] Preferably, a guide shaft is fixedly provided between the connecting frame and the positioning platform. The guide shaft is perpendicular to the positioning platform. The lifting plate has a guide hole and is slidably sleeved on the guide shaft through the guide hole.

[0015] Preferably, the sidewalls of the two positioning plugs are inclined inward toward each other.

[0016] Preferably, the measuring head includes a fixed base and a measuring scale. The fixed base is fixed to the second end of the adjusting rod, and the measuring scale is telescopically oriented in a direction parallel to the axis of rotation. The measuring scale is provided with graduations.

[0017] Preferably, the measuring head includes a laser rangefinder and a display device. The laser rangefinder is fixed to the second end of the adjusting rod and is used to measure the length dimension parallel to the axial direction of the rotating shaft. The display device can display the length dimension measured by the laser rangefinder.

[0018] Preferably, the adjusting rod is configured as a plurality of rods nested in sequence, and the two adjacent rods are extendable.

[0019] Beneficial effects:

[0020] The electric bicycle frame quality inspection device provided by this invention, during inspection, first places the head tube of the frame between two positioning plugs. A lifting drive unit then moves the two positioning plugs closer together, causing them to be inserted into both ends of the head tube along its axial direction. This vertically fixes the head tube to the positioning platform, achieving frame positioning. Subsequently, using the inspection component, the opposite ends of the rotating shaft are inserted into the axle grooves of the two forks. When the rotating shaft and fork are in place, the adjusting rod is located on the perpendicular bisector of the line connecting the two axle grooves. That is, the position of the adjusting rod can simulate the radial position when the rear wheel is installed.

[0021] When detecting wishbone misalignment, the distance deviation between the adjusting rod and the two wishbones is measured using a measuring head. If the deviation value is not greater than the deviation threshold, the wishbone misalignment parameter is considered to meet the requirements; if the deviation value is greater than the deviation threshold, the frame dimensions are considered to not meet quality requirements and require reprocessing. The laser spot emitted by the laser emitter is projected and displayed on the laser mapping head. The dimension of the laser mapping head along the second direction is configured as the misalignment threshold. The rotating shaft rotates relative to the shaft groove, meaning the entire detection component pitches and oscillates relative to the frame. If the laser emitted by the laser emitter can be projected and displayed on the laser mapping head during the oscillation, it indicates that the misalignment deviation of the front and rear wheels mounted on the frame along the width direction of the frame is within the misalignment threshold range, and the centering detection parameter is considered to meet the requirements; if the laser emitted by the laser emitter cannot be displayed on the laser mapping head during the oscillation, it indicates that the misalignment deviation of the front and rear wheels mounted on the frame along the width direction of the frame has exceeded the misalignment threshold, and the frame dimensions are considered to not meet quality requirements and require reprocessing.

[0022] This electric bicycle frame quality inspection device can be positioned using the head tube as a positioning reference. Then, through the inspection component, it can integrate the functions of frame centering detection and fork skew detection, thereby enabling fast, accurate and efficient frame centering detection and fork skew detection, effectively improving inspection efficiency and further ensuring frame quality. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the parameters for testing the centering of the electric bicycle frame and the offset of the fork.

[0024] Figure 2 This is a schematic diagram of the positioning mechanism and positioning platform provided by the present invention;

[0025] Figure 3 This is a partial schematic diagram of the positioning mechanism and positioning platform provided by the present invention;

[0026] Figure 4 This is a schematic diagram of the detection component provided by the present invention from one perspective;

[0027] Figure 5 This is a structural schematic diagram of the detection component provided by the present invention from another perspective;

[0028] Figure 6 This is a structural diagram of an electric bicycle frame.

[0029] In the picture:

[0030] 1' Frame; 11' Head tube; 12' Wrench head; 2' Front wheel; 3' Rear wheel;

[0031] 1. Positioning stage; 11. Laser mapping head; 111. First protrusion; 112. Second protrusion; 113. Third protrusion; 12. Connecting frame; 13. Guide shaft;

[0032] 2. Positioning mechanism; 21. Positioning plug; 211. First positioning plug; 212. Second positioning plug; 22. Lifting drive component; 23. Lifting plate;

[0033] 3. Detection component; 31. Adjusting rod; 32. Measuring head; 321. Fixing base; 322. Measuring ruler; 33. Rotating shaft; 34. Laser emitter;

[0034] 4. Frame; 41. Head tube; 42. Center tube; 43. Wishbone; 431. Axle groove. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0036] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0039] This invention provides a quality inspection device for electric bicycle frames. The bicycle frame 4 quality inspection device is used to detect the centering of the frame 4 and the offset vector of the fork 43. (Refer to...) Figure 6 As shown, the frame 4 includes a head tube 41, a middle tube 42 and two spaced-apart forks 43, with axle grooves 431 for mounting wheel axles on the forks 43.

[0040] Continue to refer to Figures 2 to 6As shown, the electric bicycle frame quality inspection device includes a positioning platform 1, a positioning mechanism 2, and an inspection component 3. The positioning mechanism 2 is mounted on the positioning platform 1 and includes two vertically aligned positioning plugs 21 and a lifting drive component 22. The positioning plugs 21 are used to connect to the head tube 41, and the lifting drive component 22 can drive the two positioning plugs 21 to move closer or further apart. The inspection component 3 includes an adjusting rod 31, a measuring head 32, a rotating shaft 33, and a laser emitter 34. The rotating shaft 33 is fixed to the first end of the adjusting rod 31 and is perpendicular to the adjusting rod 31. The rotating shaft 33 can be inserted into the shaft groove 431 and rotate relative to the shaft groove 431. The measuring head 32 is located at the second end of the adjusting rod 31 and is used to measure the length dimension parallel to the axial direction of the rotating shaft 33. The laser emitter 34 is fixed to the adjusting rod 31. A laser mapping head 11 is fixed on the positioning platform 1, and the centerline of the laser mapping head 11 and the axis of the two positioning plugs 21 are collinear.

[0041] In the attached diagram, direction a is the vertical direction, which is the axial direction of the front tube when it is fixed. Direction B is the horizontal direction.

[0042] The electric bicycle frame quality inspection device provided in this embodiment first places the head tube 41 of the frame 4 between two positioning plugs 21 during inspection. The lifting drive 22 drives the two positioning plugs 21 closer together, so that they are inserted into the upper and lower ends of the head tube 41 along its axial direction, thus fixing the head tube 41 axially vertically onto the positioning platform 1 and achieving frame 4 positioning. Then, using the inspection component 3, the opposite ends of the rotating shaft 33 are respectively inserted into the axle grooves 431 of the two forks 43. When the rotating shaft 33 and the forks 43 are in place, the adjusting rod 31 is located on the vertical line connecting the two axle grooves 431. That is, the position of the adjusting rod 31 can simulate the radial position when the rear wheel is installed.

[0043] When the fork 43 is misaligned, the distance deviation between the adjusting rod 31 and the two forks 43 and the adjusting rod 31 is measured by the measuring head 32, which can complete the misalignment detection of the fork 43. When the deviation value is not greater than the deviation threshold, it is determined that the parameter of misalignment of the fork 43 meets the requirements; if the deviation value is greater than the deviation threshold, it is determined that the dimensions of the frame 4 do not meet the quality requirements and need to be reprocessed.

[0044] The laser spot emitted by laser emitter 34 can be projected and displayed on laser mapping head 11. The size of laser mapping head 11 along the second direction is configured as a misalignment threshold. When centering is detected, the rotating shaft 33 rotates relative to the shaft groove 431, that is, the detection component 3 as a whole swings relative to the frame 4. When the laser emitted by laser emitter 34 can be projected and displayed on laser mapping head 11 during the swing, it means that the misalignment deviation of the front and rear wheels mounted on the frame 4 along the width direction of the frame 4 is within the misalignment threshold range, and the centering detection parameter is deemed to meet the requirements. When the laser emitted by laser emitter 34 cannot be displayed on laser mapping head 11 during the swing, it means that the misalignment deviation of the front and rear wheels mounted on the frame 4 along the width direction of the frame 4 has exceeded the misalignment threshold, and the size of the frame 4 is deemed not to meet the quality requirements and needs to be reprocessed.

[0045] This electric bicycle frame quality inspection device can be positioned using the head tube 41 as a positioning reference, taking into account the verticality of the head tube 41. Then, through the inspection component 3, it can integrate the centering detection of the frame 4 and the offset detection of the fork 43, thereby enabling fast, accurate and efficient centering detection of the frame 4 and offset detection of the fork 43, effectively improving inspection efficiency and further ensuring the quality of the frame 4.

[0046] In this embodiment, the centerline of the laser mapping head 11 and the axes of the two positioning plugs 21 are collinear on the straight line A1A2.

[0047] In this embodiment, the threshold value for the distance deviation between the adjusting rod 31 and the two wishbones 43 is preferably set to 2mm, that is, the absolute value of the difference between the distance between the left wishbone 43 and the adjusting rod 31 and the distance between the right wishbone 43 and the adjusting rod 31 is not greater than 2mm. In this embodiment, the threshold value for the misalignment deviation of the front wheel and the rear wheel along the width direction of the frame 4 is preferably set to 3mm.

[0048] In this embodiment, the laser mapping head 11 includes a first protrusion 111, a second protrusion 112, and a third protrusion 113. The first protrusion 111 is fixed on the positioning stage 1, the second protrusion 112 is fixed above the first protrusion 111, and the third protrusion 113 is fixed above the second protrusion 112. The widths of the first protrusion 111, the second protrusion 112, and the third protrusion 113 decrease sequentially in the horizontal direction. Specifically, the widths of the first protrusion 111, the second protrusion 112, and the third protrusion 113 in the horizontal direction are, in the figure, the dimensions of the first protrusion 111, the second protrusion 112, and the third protrusion 113 in the second direction, which means that three misalignment thresholds are set. Specifically, the dimension of the first protrusion 111 in the second direction is set to 3mm, the dimension of the second protrusion 112 in the second direction is set to 2mm, and the dimension of the third protrusion 113 in the second direction is set to 1mm. When performing centering tests, if the laser emitted by the laser emitter 34 can be projected onto and displayed on the first protrusion 111 during the rotation of the shaft 33 relative to the shaft groove 431, it proves that the centering of the frame 4 is within 3mm; if the laser can be projected onto and displayed on the second protrusion 112, it proves that the centering of the frame 4 is within 2mm; if the laser can be projected onto and displayed on the third protrusion 113, it proves that the centering of the frame 4 is within 1mm; if the laser cannot be projected onto and displayed on any protrusion, it proves that the frame 4 is of poor quality and needs to be reprocessed.

[0049] In this embodiment, the lifting drive component 22 is configured as a telescopic cylinder, and the positioning plug 21 includes a first positioning plug 211 and a second positioning plug 212. The first positioning plug 211 is fixed on the positioning platform 1 and located below the second positioning plug 212. The cylinder body of the telescopic cylinder is fixed on the positioning platform 1, and the cylinder rod of the telescopic cylinder is fixedly connected to the second positioning plug 212. Specifically, the cylinder rod of the telescopic cylinder can extend and retract vertically relative to the cylinder body, thereby causing the second positioning plug 212 to move closer to or further away from the first positioning plug 211.

[0050] In this embodiment, a connecting frame 12 is fixedly installed on the positioning platform 1, and the cylinder body of the telescopic cylinder and the laser mapping head 11 are both fixed on the connecting frame 12. The connecting frame 12 provides a reliable mounting position for the telescopic cylinder.

[0051] Specifically, the connecting frame 12 is fixedly connected to the positioning platform 1 by screws or other connecting parts. The first positioning plug 211 is fixedly connected to the positioning platform 1 by screws or other connecting parts.

[0052] Furthermore, the cylinder rod of the telescopic cylinder is connected to a lifting plate 23, and the second positioning plug 212 is fixed to the lifting plate 23. Specifically, the lifting plate 23 is fixedly connected to the cylinder rod of the telescopic cylinder by screws or other connecting parts. The second positioning plug 212 is fixedly connected to the lifting plate 23 by screws or other connecting parts.

[0053] Furthermore, a guide shaft 13 is fixedly installed between the connecting frame 12 and the positioning platform 1. The guide shaft 13 is perpendicular to the positioning platform 1, and the lifting plate 23 has a guide hole. The lifting plate 23 is slidably sleeved on the guide shaft 13 through the guide hole. Specifically, when the cylinder rod of the telescopic cylinder extends or retracts relative to the cylinder body, the lifting plate 23 slides and rises and falls on the guide shaft 13 through the sliding hole, thereby ensuring that the lifting plate 23 moves strictly in the vertical direction and effectively ensuring the lifting guidance of the second positioning plug 212.

[0054] Furthermore, the sidewalls of the two positioning plugs 21 are inclined inwards towards each other. This arrangement is equivalent to the ends of the first positioning plug 211 and the second positioning plug 212 being tapered, which makes the insertion of the first tube 41 more reliable and effective, further ensuring reliable positioning of the first tube 41 when in contact with it. Even if the first tube 41 is not axially collinear with the two positioning plugs 21, the first tube 41 can still be guided to the target positioning position when in contact with the positioning plug 21, that is, the first tube 41, the first positioning plug 211 and the second positioning plug 212 are ultimately coaxial.

[0055] In this embodiment, the measuring head 32 includes a fixed base 321 and a measuring scale 322. The fixed base 321 is fixed to the second end of the adjusting rod 31, and the measuring scale 322 is telescopically oriented in a direction parallel to the axial direction of the rotating shaft 33. The measuring scale 322 is provided with graduations. Specifically, the measuring scale 322 extends out and abuts against the corresponding end of the fork 43. At this time, by reading the graduation value on the measuring scale 322, the distance between the fork 43 and the adjusting rod 31 can be obtained. Specifically, the measuring scale 322 can extend and retract left and right in a direction parallel to the axial direction of the rotating shaft 33, thereby enabling the sequential measurement of the distance between the left and right fork 43.

[0056] As an optional implementation, the measuring head 32 includes a laser rangefinder sensor and a display device. The laser rangefinder sensor is fixed to the second end of the adjusting rod 31 and is used to measure the length dimension in the direction parallel to the axial direction of the rotating shaft 33. The display device can display the length dimension measured by the laser rangefinder sensor. Specifically, the laser rangefinder sensor can project a laser beam in the direction of the zygomatic bone 43 to measure the distance to the corresponding zygomatic bone 43, and the measured distance dimension can be displayed by the display device.

[0057] As an optional implementation, the adjusting rod 31 is configured as multiple nested rods, with adjacent rods being telescopically adjustable. This configuration effectively treats the adjusting rod 31 as a single telescopic rod, allowing its length to be adjusted according to actual usage needs, further ensuring practicality and compatibility to meet the testing requirements of frames 4 of different sizes.

[0058] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A quality inspection device for an electric bicycle frame, used to inspect the centering and fork offset of a frame (4), the frame (4) comprising a head tube (41), a center tube (42) and two spaced forks (43), the forks (43) having grooves (431) for mounting wheel axles, characterized in that, The electric bicycle frame quality testing device includes: Positioning station (1); The positioning mechanism (2) is located on the positioning platform (1). The positioning mechanism (2) includes two positioning plugs (21) arranged vertically opposite each other, and also includes a lifting drive (22). The positioning plugs (21) are used to be inserted into the head tube (41). The lifting drive (22) can drive the two positioning plugs (21) to approach or move away from each other. The testing component (3) includes an adjusting rod (31), a measuring head (32), a rotating shaft (33), and a laser emitter (34). The rotating shaft (33) is fixed to the first end of the adjusting rod (31) and is perpendicular to the adjusting rod (31). The rotating shaft (33) can be inserted into the shaft groove (431) and rotate relative to the shaft groove (431). The measuring head (32) is located at the second end of the adjusting rod (31) and is used to measure the length dimension parallel to the axial direction of the rotating shaft (33). The laser emitter (34) is fixed on the adjusting rod (31). A laser mapping head (11) is fixed on the positioning stage (1). The center line of the laser mapping head (11) and the axes of the two positioning plugs (21) are collinear. The laser mapping head (11) includes a first protrusion (111), a second protrusion (112), and a third protrusion (113). The first protrusion (111) is fixed on the positioning platform (1), the second protrusion (112) is fixed above the first protrusion (111), and the third protrusion (113) is fixed above the second protrusion (112). The widths of the first protrusion (111), the second protrusion (112), and the third protrusion (113) decrease sequentially in the horizontal direction.

2. The electric bicycle frame quality testing device according to claim 1, characterized in that, The lifting drive component (22) is configured as a telescopic cylinder. The positioning plug (21) includes a first positioning plug (211) and a second positioning plug (212). The first positioning plug (211) is fixed on the positioning platform (1) and located below the second positioning plug (212). The cylinder body of the telescopic cylinder is fixed on the positioning platform (1), and the cylinder rod of the telescopic cylinder is fixedly connected to the second positioning plug (212).

3. The electric bicycle frame quality testing device according to claim 2, characterized in that, A connecting frame (12) is fixedly installed on the positioning platform (1), and the cylinder body of the telescopic cylinder and the laser mapping head (11) are both fixed on the connecting frame (12).

4. The electric bicycle frame quality inspection device according to claim 3, characterized in that, The cylinder rod of the telescopic cylinder is connected to a lifting plate (23), and the second positioning plug (212) is fixed on the lifting plate (23).

5. The electric bicycle frame quality inspection device according to claim 4, characterized in that, A guide shaft (13) is fixedly provided between the connecting frame (12) and the positioning platform (1). The guide shaft (13) is perpendicular to the positioning platform (1). The lifting plate (23) has a guide hole and is slidably sleeved on the guide shaft (13) through the guide hole.

6. The electric bicycle frame quality testing device according to claim 1, characterized in that, The sidewalls of the two positioning plugs (21) are respectively inclined inward toward each other.

7. The electric bicycle frame quality testing device according to claim 1, characterized in that, The measuring head (32) includes a fixed base (321) and a measuring scale (322). The fixed base (321) is fixed to the second end of the adjusting rod (31). The measuring scale (322) is telescopically oriented in a direction parallel to the axis of rotation (33). The measuring scale (322) is provided with graduations.

8. The electric bicycle frame quality testing device according to claim 1, characterized in that, The measuring head (32) includes a laser rangefinder and a display device. The laser rangefinder is fixed to the second end of the adjusting rod (31) and is used to measure the length dimension in the axial direction parallel to the rotating shaft (33). The display device can display the length dimension measured by the laser rangefinder.

9. The electric bicycle frame quality testing device according to claim 1, characterized in that, The adjusting rod (31) is configured as multiple rods nested in sequence, and the two adjacent rods can be extended and retracted.

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