A bicycle fork, strength testing apparatus and method of testing

Abstract

The present application relates to the field of bicycle strength test, in particular to a bicycle front fork, strength detection equipment and detection method, the detection equipment includes base, and the detection platform is elastically installed on the base, the detection platform is provided with the plug-in seat, the plug-in seat is connected with the claw hook of the bottom end of the outer tube, the head tube clamp is arranged on the base, the vibration simulation unit drives the detection platform to reciprocate in the vertical direction, the vibration simulation unit includes cam and rotary driver, the cam transmission connection work end of rotary driver, the cam side of the week is attached to the bottom of the detection platform; The rotary driver is fixedly installed on the first sliding seat, the first sliding seat is slidingly installed on the inclined slide, the inclined slide extends in the direction perpendicular to the cam rotation axis, the first sliding seat is connected with the work end of the second linear driver, the technical scheme drives the first sliding seat to drive the cam to reciprocate along the inclined slide and change the amplitude of the detection platform through the second linear driver, and the anti-seismic ability of the front fork to different intensity vibration is detected.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bicycle strength testing, in particular to a bicycle front fork, a strength detection device and a detection method. BACKGROUND

[0002] The front fork component is located in the front part of the bicycle structure, the upper end of which is connected with the handlebar component, the frame component cooperates with the front tube, and the lower end cooperates with the front axle component of the front wheel to form a guide system of the bicycle, and the front wheel can change direction by rotating the handlebar and the front fork, thereby playing a guiding role of the bicycle, and the stress condition of the front fork component is the same as that of a cantilever beam, so the front fork component must have sufficient strength, therefore, the quality detection of the front fork component is very important.

[0003] The bicycle front fork testing device is a device commonly used for front fork quality detection, which usually includes a base, a fixing mechanism and an impact assembly, etc., in the detection, the front fork to be detected is first fixed in the fixing mechanism, then the impact assembly is used to impact the front fork to be detected, and finally the damage of the front fork is checked to judge the strength of the front fork, but the impact force on the front fork is constant, which cannot simulate the influence of the real bumpy road on the front fork, and cannot detect whether the recovery ability of the front fork with shock absorption function can keep the front fork at a normal height after impact simulation, the shock absorption ability of the front fork decreases after daily use, and the height position of the head tube decreases, which changes the riding posture of the user and increases the physical burden of the user. SUMMARY

[0004] In view of the above problems, it is necessary to provide a bicycle front fork, a strength detection device and a detection method in view of the problems of the prior art.

[0005] To solve the problems of the prior art, the technical scheme adopted by the present application is as follows:

[0006] A bicycle front fork, comprising a head tube, and a fork crown mounted on the head tube, two parallel stroke pipes are arranged on the fork crown, the stroke pipes are inserted into an outer pipe, a claw hook is arranged at the bottom of the outer pipe, a sealing element is arranged at the connecting position of the stroke pipe and the outer pipe, an extension rod is coaxially arranged in the stroke pipe, a partition ring is arranged in the outer pipe, the partition ring and the bottom of the outer pipe form a buffer cavity in a straight line, and the buffer cavity is provided with an elastic element; the extension rod passes through the partition ring and enters the buffer cavity, a piston head is arranged at the bottom of the extension rod, the piston head is attached to the inner wall of the buffer cavity, the elastic element elastically connects the bottom of the piston head and the bottom of the buffer cavity, and the elastic element applies an elastic force to the piston head to attach to the bottom of the partition ring.

[0007] The utility model provides a kind of bicycle front fork strength detection equipment, applied to a kind of bicycle front fork, including pedestal, and the detection platform elastically mounted on pedestal, detection platform is provided with insertion seat, insertion seat is connected the claw hook of outer tube bottom end, pedestal is provided with head tube clamp, head tube clamp is clamped and fixed to head tube;Pedestal is provided with vibration simulation unit, vibration simulation unit drives detection platform to reciprocate in vertical direction, the vibration simulation unit includes cam and rotary driver, cam transmission connection rotary driver's working end, the axis of cam is horizontally arranged, cam side sticks to detection platform bottom;Rotary driver is fixedly installed on first sliding seat, first sliding seat is slidably installed on inclined slide, inclined slide extends obliquely in the direction perpendicular to the axis of rotation of cam, first sliding seat is connected the working end of second linear driver, and second linear driver drives first sliding seat to reciprocate along inclined slide and change the amplitude of detection platform.

[0008] Preferably, the bottom of the detection platform is provided with a plurality of vertically downward extending guide rods, and the pedestal is provided with a guide sleeve in the same straight line as the axis of the guide rod, the guide rod is inserted into the guide sleeve, and the guide sleeve is provided with a spring outside, the spring elastically connects the pedestal and the detection platform.

[0009] Preferably, the head tube clamp includes a sleeve for being sleeved on the head tube, the sleeve is installed on a moving table, the moving table is fixedly installed on the working end of the first linear driver, the working end of the first linear driver is arranged to move in the vertical direction, and the first linear driver is installed on the pedestal; The moving table is further provided with a pressing sleeve in the same straight line as the axis of the sleeve, the pressing sleeve is located above the sleeve, and the pressing sleeve presses the top of the head tube.

[0010] Preferably, the working end of the second linear driver is arranged to move in the horizontal direction, a second sliding seat is installed on the working end of the second linear driver, the bottom of the first sliding seat is provided with a connecting rod, and the connecting rod is vertically inserted into the second sliding seat.

[0011] Preferably, the moving table of the head tube clamp is fixedly installed with a laser range finder, the working end of the laser range finder is vertically downward arranged, the first linear driver drives the moving table to move upwards to the upper side of the sleeve and flush with the top end of the head tube, and the laser range finder detects the distance between the upper surface of the detection platform and the laser range finder; The pedestal is provided with a height fixing assembly, and the height fixing assembly is used for fixing the height position of the detection platform.

[0012] Preferably, the height fixing assembly includes a base and a supporting block installed on the base, the base is provided with a vertical guide hole, the base is slidably installed on the slide rod provided on the pedestal through the guide hole, and when the base moves upwards to the gasket abutting against the bottom of the detection platform along the slide rod, the supporting block supports the detection platform.

[0013] Preferably, the base is arranged at the lower end of the inclined slide, the bottom of the base is provided with a matching block, and the bottom of the matching block is provided with an inclined surface facing the upper slope of the inclined slide; a horizontally extending top block is fixedly installed at one end of the second slide towards the height fixing assembly, and when the second slide moves towards one end of the height fixing assembly driven by the second linear driver, the top block drives the inclined surface at the bottom of the matching block to move upwards.

[0014] Preferably, a threaded sleeve is arranged on the base, the axis of the threaded sleeve is vertically arranged, the support block is screw-installed in the threaded sleeve through the vertically arranged screw rod at the bottom, and a locking bolt for locking the height position of the support block is screw-installed on the screw rod.

[0015] A bicycle front fork strength detection method is realized by using a bicycle front fork strength detection device, and includes the following steps:

[0016] Step one, install the front fork on the detection table, insert the seat to fix the bottom of the front fork, and the head tube clamp fixes the head tube of the front fork;

[0017] Step two, start the vibration simulation unit, and the rotary driver drives the cam to rotate to drive the detection table to vibrate;

[0018] Step three, start the second linear driver to drive the cam to move to change the amplitude of the detection table, and simulate daily vibration;

[0019] Step four, remove the vibrated front fork for detection.

[0020] The beneficial effects of the present application compared with the prior art are:

[0021] Firstly, in the present application, the bottom of the detection table is attached to the periphery of the cam, so that when the cam rotates, the detection table fixed with the front fork vibrates, the rotation speed of the rotary driver changes the rotation speed of the cam, and the vibration frequency of the front fork can be changed; the rotary driver is slidingly installed on the inclined slide, the position of the cam on the inclined slide is changed, and different vibration amplitudes can be simulated, so that the anti-vibration ability of the front fork to different intensity vibrations can be detected, and the detection environment of the front fork is more realistic.

[0022] Secondly, the present application uses a laser range finder to detect the distance between the top end of the front fork and the detection table before and after detection, and compares the two data to determine whether the length of the elastic member changes after the front fork is tested, so as to determine the strength of the front fork to the bumpy road. The height fixing assembly is arranged on the base, and the height fixing assembly is used to fix the height position of the detection table before and after detection.

[0023] Thirdly, the present application ensures that the height position of the detection table before and after the vibration simulation unit is started is at the same position by using the height fixing assembly, so as to ensure that the detection surface position of the laser range finder is consistent, and to avoid errors in the detection data. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a perspective view of a bicycle front fork;

[0025] Figure 2 is a cross-sectional view of a bicycle front fork;

[0026] Figure 3 is a perspective view of a bicycle front fork strength detection device in a non-working state;

[0027] Figure 4 is Figure 3 is an enlarged view of A of

[0028] Figure 5 is a front view of a bicycle front fork strength detection device in a non-working state;

[0029] Figure 6 is an enlarged view of B of Figure 5

[0030] Figure 7 is a perspective view of a bicycle front fork strength detection device in a working state;

[0031] Figure 8 is a front view of a bicycle front fork strength detection device in a working state;

[0032] Figure 9 is a perspective structural exploded view of a bicycle front fork strength detection device.

[0033] In the figure, the reference signs are: 1, head tube; 11, fork crown; 12, stroke tube; 121, extension rod; 122, piston head; 2, outer tube; 21, claw hook; 22, sealing element; 23, partition ring; 24, buffer cavity; 241, elastic element; 3, base; 31, guide sleeve; 311, spring; 32, height fixing assembly; 321, base; 322, support block; 323, guide hole; 324, fitting block; 325, inclined surface; 326, threaded sleeve; 327, screw rod; 328, locking bolt; 33, sliding rod; 4, detection table; 41, plug-in seat; 42, guide rod; 43, gasket; 5, head tube clamp; 51, sleeve; 52, moving table; 521, pressing sleeve; 53, first linear driver; 54, laser range finder; 6, vibration simulation unit; 61, cam; 62, rotary driver; 621, first sliding seat; 622, second linear driver; 623, second sliding seat; 624, connecting rod; 625, top block; 63, inclined slide. DETAILED DESCRIPTION

[0034] In order to further understand the features, technical means and specific purposes and functions achieved by the present application, the present application is described in further detail below in combination with the drawings and specific embodiments. ​

[0035] Referring to Figure 1 and Figure 2 :

[0036] A bicycle front fork, comprising a head tube 1, a fork crown 11 mounted on the head tube 1, two parallel stroke tubes 12 provided on the fork crown 11, the stroke tubes 12 being inserted into an outer tube 2, the bottom of the outer tube 2 being provided with a claw hook 21, the connection position of the stroke tubes 12 and the outer tube 2 being provided with a sealing element 22, a coaxial extension rod 121 being provided in the stroke tube 12, a partition ring 23 being provided in the outer tube 2, the partition ring 23 being linearly formed with a buffer cavity 24 at the bottom of the outer tube 2, the buffer cavity 24 being provided with an elastic element 241; the extension rod 121 passes through the partition ring 23 and enters the buffer cavity 24, the bottom of the extension rod 121 is provided with a piston head 122, the piston head 122 is attached to the inner wall of the buffer cavity 24, the elastic element 241 elastically connects the bottom of the piston head 122 and the bottom of the buffer cavity 24, and the elastic element 241 exerts a force on the piston head 122 to make it move upward and attach to the bottom of the partition ring 23.

[0037] The bicycle front fork in the present application is composed of a conventional head tube 1, a fork crown 11 and an outer tube 2. Two stroke tubes 12 are mounted on the fork crown 11 of the head tube 1, the stroke tubes 12 are inserted into the outer tube 2, the stroke tubes 12 move along the axis of the outer tube 2 in the outer tube 2, a sealing element 22 is provided at the connection position of the stroke tubes 12 and the outer tube 2, the sealing element 22 is sealed by an oil seal or the like, which ensures the sealing of the connection position when the stroke tubes 12 move relative to the outer tube 2. In this embodiment, an extension rod 121 is provided inside the stroke tube 12 and inserted into a buffer cavity 24 formed in the outer tube 2 by a partition ring 23. The extension rod 121 is installed inside the stroke tube 12 without affecting the sliding fit of the stroke tube 12 and the inner wall of the outer tube 2, so it does not affect the smoothness of the movement of the stroke tube 12. The elastic element 241 in the buffer cavity 24 exerts a force on the piston head 122 at the bottom of the extension rod 121 to make it move upward and attach to the bottom of the partition ring 23. The elastic element 241 can be a mechanical spring, a gas spring or hydraulic oil, etc. When the ground is bumpy, the upward movement of the outer tube 2 will compress the elastic element 241, which absorbs the vibration and reduces the vibration transmitted to the head tube 1, achieving shock absorption. The elastic element 241 is located inside the outer tube 2 and is not easily damaged by external forces, and the front fork remains simple and beautiful.

[0038] Referring to Figures 1 to 9 :

[0039] A bicycle front fork strength detection device applied to a bicycle front fork, comprising a base 3 and a detection table 4 elastically mounted on the base 3, the detection table 4 is provided with an insertion seat 41 connected with the claw hook 21 at the bottom end of the outer tube 2, the base 3 is provided with a head tube clamp 5 for clamping and fixing the head tube 1; the base 3 is provided with a vibration simulation unit 6 for driving the detection table 4 to reciprocate in the vertical direction, the vibration simulation unit 6 comprises a cam 61 and a rotary driver 62, the cam 61 is drivingly connected with the working end of the rotary driver 62, the axis of the cam 61 is horizontally arranged, and the cam 61 is attached to the bottom of the detection table 4; the rotary driver 62 is fixedly mounted on a first sliding seat 621, the first sliding seat 621 is slidingly mounted on an inclined slide 63, the inclined slide 63 extends obliquely along a direction perpendicular to the rotation axis of the cam 61, the first sliding seat 621 is connected with the working end of a second linear driver 622, and the second linear driver 622 drives the first sliding seat 621 to reciprocate along the inclined slide 63 to change the amplitude of the detection table 4.

[0040] The front fork strength detection device in the application detects whether the recovery capability of the elastic element 241 can make the head tube 1 return to the normal height after the simulation of jolting of the front fork, so as to avoid the decline of the damping capacity caused by the decline of the elastic force of the elastic element 241 after daily use, the decline of the height position of the head tube 1, the change of the riding posture of the user, and the increase of the physical burden. During the detection, the staff installs the claw hook 21 of the outer tube 2 on the plug-in seat 41 of the detection table 4, and fixes the head tube 1 through the head tube clamp 5. When the detection is performed, the vibration simulation unit 6 on the base 3 starts to drive the detection table 4 to vibrate in the vertical direction, simulates the jolting in the daily riding process, detects the distance between the top end of the head tube 1 and the bottom end of the outer tube 2 after the outer tube 2 is vibrated by the detection table 4 for a period of time, and judges the deformation degree of the elastic element 241. In the embodiment, the vibration simulation unit 6 includes a cam 61 and a rotary driver 62. The periphery of the cam 61 is attached to the bottom of the detection table 4. The rotary driver 62 can be a servo motor. When the rotary driver 62 drives the cam 61 to rotate, the part of the periphery of the cam 61 far from the rotation axis of the cam 61 can push the detection table 4 upward when the part is attached to the bottom of the detection table 4, and the detection table 4 can be reset under the action of gravity when the part of the periphery of the cam 61 close to the rotation axis of the cam 61 is attached to the bottom of the detection table 4. The rotary driver 62 can change the vibration frequency of the front fork by changing the rotation speed of the cam 61. In the embodiment, the rotary driver 62 is slidably installed on the inclined slide 63 through the first sliding seat 621, and the second linear driver 622 can drive the first sliding seat 621 to drive the rotary driver 62 and the cam 61 to move on the inclined surface of the inclined slide 63. When the rotary driver 62 moves to the lower end of the inclined slide 63, the rotation axis of the cam 61 is far from the bottom of the detection table 4, the cam 61 can push the detection table 4 to move upward for a short distance, the pressure applied to the front fork is small, and the slight jolting is simulated. When the rotary driver 62 moves to the higher end of the inclined slide 63, the rotation axis of the cam 61 is close to the bottom of the detection table 4, the cam 61 can push the detection table 4 to move upward for a long distance, the pressure applied to the front fork is large, and the strong jolting is simulated. By changing the position of the cam 61 on the inclined slide 63, different vibration amplitudes can be simulated, the anti-vibration capacity of the front fork to different intensity vibrations can be detected, and the detection environment of the front fork is more real.

[0041] In order to solve XXXX, the following features are specifically provided:

[0042] The bottom of the detection table 4 is provided with a plurality of guide rods 42 extending vertically downward, the base 3 is provided with a guide sleeve 31 in the same straight line as the axis of the guide rod 42, the guide rod 42 is inserted into the guide sleeve 31, and the guide sleeve 31 is provided with a spring 311.

[0043] The detection table 4 in the embodiment is inserted into the guide sleeve 31 of the base 3 through the guide rod 42 at the bottom, so as to ensure stable reciprocating movement of the detection table 4 in the vertical direction during testing, avoid bending of the front fork fixed on the plug-in seat 41 due to deviation of the detection table 4, and elastically connect the base 3 and the detection table 4 through the spring 311. The spring 311 cooperates with the gravity of the detection table 4 to ensure that the bottom of the detection table 4 can be attached to the circumferential side of the cam 61, or to keep the detection table 4 at a certain height, so that the cam 61 can be separated from the detection table 4 when the first sliding seat 621 moves to the lowest end of the inclined slide 63, and the strength test on the front fork is stopped.

[0044] In order to solve the problem of how to ensure that the position of the head tube 1 in the vibration does not deviate during strength detection, the following features are specifically provided:

[0045] The head tube clamp 5 comprises a sleeve 51 for sleeving on the head tube 1, the sleeve 51 is installed on a moving table 52, the moving table 52 is fixedly installed on the working end of a first linear driver 53, the working end of the first linear driver 53 is arranged to move in the vertical direction, and the first linear driver 53 is installed on the base 3; The moving table 52 is also provided with a pressing sleeve 521 which is in the same straight line as the axis of the sleeve 51, and the pressing sleeve 521 is located above the sleeve 51 and presses the top of the head tube 1.

[0046] In the embodiment, the head tube 1 is fixed and clamped by the head tube clamp 5, which comprises the sleeve 51 and the pressing sleeve 521 installed on the moving table 52. After the staff installs the claw hook 21 of the front fork on the plug-in seat 41 of the detection table 4, the head tube 1 is kept vertical, the first linear driver 53 drives the moving table 52 to sleeve the sleeve 51 on the head tube 1 from top to bottom, and then moves downward to sleeve the pressing sleeve 521 on the head tube 1 and press the top of the head tube 1, the sleeve 51 keeps the axis of the head tube 1 stable, and the pressing sleeve 521 keeps the head tube 1 from deviating in the axial direction during the strength test, which affects the test effect on the elastic member 241. The sleeve 51 and the pressing sleeve 521 on the moving table 52 can be replaced according to the size of the head tube 1 to be detected, and the first linear driver 53 can be a sliding table or other lifting structure, which will not be described in detail here.

[0047] In order to solve the problem of how the second linear driver 622 drives the first sliding seat 621 to slide on the inclined slide 63, the following features are specifically provided:

[0048] The working end of the second linear driver 622 is arranged to move in the horizontal direction, the second sliding seat 623 is installed on the working end of the second linear driver 622, and the bottom of the first sliding seat 621 is provided with a connecting rod 624 which is vertically inserted into the second sliding seat 623.

[0049] The second linear driver 622 in the embodiment can be a torch push rod or a pneumatic cylinder, and the working end of the second linear driver 622 is arranged to move in the horizontal direction. The bottom of the first sliding seat 621 is provided with a connecting rod 624 and a second sliding seat 623 installed on the working end of the second linear driver 622. The connecting rod 624 can also be hinged to the bottom of the first sliding seat 621. When the second sliding seat 623 moves horizontally, the first sliding seat 621 moves along the inclined surface of the inclined slide 63. The connecting rod 624 moves synchronously in the vertical direction in the second sliding seat 623.

[0050] In order to solve the problem of how to judge the strength of the front fork, the following features are specifically provided:

[0051] The moving table 52 of the head tube clamp 5 is fixedly provided with a laser range finder 54. The working end of the laser range finder 54 is arranged vertically downward. The first linear driver 53 drives the moving table 52 to move upward to the upper side of the sleeve 51 and aligns with the top end of the head tube 1. The laser range finder 54 detects the distance between the upper surface of the detection table 4 and the laser range finder 54. The base 3 is provided with a height fixing assembly 32 for fixing the height position of the detection table 4.

[0052] In the embodiment, the moving table 52 of the head tube clamp 5 is provided with a laser range finder 54. When the staff fixes the head tube 1 of the front fork, the moving table 52 moves downward to the position where the sleeve 51 aligns with the top end of the head tube 1. At this time, the head tube 1 remains fixed in position. The laser range finder 54 detects the distance between the working end of the laser range finder 54 and the surface of the detection table 4. Then, the moving table 52 moves downward to press the head tube 1. When the vibration simulation is completed, the moving table 52 moves upward again to align the sleeve 51 with the top end of the head tube 1. Then, the laser range finder 54 detects the distance between the detection table 4 again. Through the comparison of the two data, it is judged whether the length of the elastic member 241 changes after the front fork is tested, so as to judge the strength of the front fork against the bumpy road. The base 3 is also provided with a height fixing assembly 32 for fixing the height position of the detection table 4 before and after each detection, so as to ensure that the detection surface position of the laser range finder 54 is consistent and avoid errors in the detection data.

[0053] In order to solve the problem of how the height fixing assembly 32 keeps the detection table 4 at the same height position before and after the vibration simulation unit 6 is started, the following features are specifically provided:

[0054] The height fixing assembly 32 includes a base 321 and a support block 322 installed on the base 321. The base 321 is provided with a vertical guide hole 323. The base 321 is slidably installed on the slide rod 33 provided on the base 3 through the guide hole 323. When the base 321 moves upward along the slide rod 33 to the position where the support block 322 abuts against the gasket 43 at the bottom of the detection table 4, the support block 322 supports the detection table 4.

[0055] The base 321 is arranged at the lower end of the inclined slide 63, and a fitting block 324 is arranged at the bottom of the base 321, and a slope 325 is arranged at the bottom of the fitting block 324 and faces the upper slope of the inclined slide 63; a horizontal extension top block 625 is fixedly installed at one end of the height fixing assembly 32, and when the second sliding seat 623 is driven by the second linear driver 622 to move to one end of the height fixing assembly 32, the top block 625 drives the slope 325 at the bottom of the fitting block 324 to move upward.

[0056] In the embodiment, the height fixing assembly 32 includes a base 321 and a support block 322 which are slidingly installed on the slide rod 33, when the second sliding seat 623 and the first sliding seat 621 are driven by the second linear driver 622 of the vibration simulation unit 6 to move to the lowest end of the inclined slide 63, the horizontal insertion 635 at one side of the second sliding seat 623 is inserted under the fitting block 324 at the bottom of the base 321, and in the process of contacting the slope 325 at the bottom of the fitting block 324, the base 321 is lifted to the support block 322 which is in contact with the gasket 43 at the bottom of the detection table 4 to support the detection table 4, so as to ensure that the height position of the detection table 4 is uniform, when the vibration simulation unit 6 is started, the first sliding seat 621 moves upward along the inclined slide 63 and contacts the bottom of the detection table 4 when the second sliding seat 623 is driven by the second linear driver 622 to move, the top block 625 moves away from the fitting block 324, so that the base 321 moves downward under the action of gravity to contact the base 3 through the fitting block 324, and the support block 322 moves downward to release the support of the detection table 4, so that the detection table 4 does not contact the support block 322 when vibrating.

[0057] In order to solve the problem of how to ensure that the detection table 4 is at a suitable height, the following features are specifically provided:

[0058] A threaded sleeve 326 is arranged on the base 321, the axis of the threaded sleeve 326 is vertically arranged, the support block 322 is screw installed in the threaded sleeve 326 through the vertically arranged screw rod 327 at the bottom, and a locking bolt 328 for locking the height position of the support block 322 is screw installed on the screw rod 327.

[0059] In the embodiment, the support block 322 is screw installed in the threaded sleeve 326 of the base 321 through the screw rod 327 at the bottom, the screw rod 327 can adjust the distance between the top end of the support block 322 and the base 321 by rotating in the threaded sleeve 326, and the locking bolt 328 locks the position of the screw rod 327, so as to ensure that the support block 322 supports the detection table 4, so that the detection table 4 can stay at a suitable height position, and the application range of the equipment is improved.

[0060] Working principle: when detecting, the worker installs the claw hook 21 of the outer tube 2 on the plug-in seat 41 of the detection table 4, and fixes the head tube 1 of the front fork, and then the moving table 52 is lowered to the position where the sleeve 51 is aligned with the top end of the head tube 1, at this time, the head tube 1 is kept fixed, the laser range finder 54 detects the distance between the working end of the laser range finder 54 and the surface of the detection table 4, and then the moving table 52 is lowered to the position where the pressing sleeve 521 presses and fixes the head tube 1, when detecting, the vibration simulation unit 6 on the base 3 drives the detection table 4 to vibrate in the vertical direction, simulates the bumping in the daily riding process, changes the position of the cam 61 on the inclined slide 63, and thus different vibration amplitudes can be simulated, when the vibration simulation is completed, the moving table 52 is raised again to the position where the sleeve 51 is aligned with the top end of the head tube 1, and then the laser range finder 54 detects the distance between the working end of the laser range finder 54 and the surface of the detection table 4 again, and the length change of the elastic piece 241 of the front fork after the test is judged by comparing the two data, so as to judge the strength of the front fork to the bumpy road surface.

[0061] A bicycle front fork strength detection method is realized by using a bicycle front fork strength detection device, and comprises the following steps.

[0062] Step one, install the front fork on the detection table 4, the plug-in seat 41 fixes the bottom of the front fork, and the head tube clamp 5 fixes the head tube of the front fork;

[0063] Step two, start the vibration simulation unit 6, the rotary driver 62 drives the cam 61 to rotate and drives the detection table 4 to vibrate;

[0064] Step three, start the second linear driver 622 to drive the cam 61 to move and change the amplitude of the detection table 4, and simulate the daily vibration;

[0065] Step four, remove the front fork after vibration for detection.

[0066] The above embodiments only express one or several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A bicycle front fork strength detection device, comprising a base (3) and a detection table (4) elastically mounted on the base (3), the detection table (4) is provided with a plug-in seat (41), the plug-in seat (41) is connected with a claw hook (21) at the bottom end of an outer tube (2), the base (3) is provided with a head tube clamp (5) for clamping and fixing a head tube (1); The base (3) is provided with a vibration simulation unit (6) for driving the detection table (4) to reciprocate in the vertical direction, the vibration simulation unit (6) comprises a cam (61) and a rotary driver (62), the cam (61) is drivingly connected with the working end of the rotary driver (62), the axis of the cam (61) is horizontally arranged, and the cam (61) is attached to the bottom of the detection table (4); The rotary driver (62) is fixedly mounted on a first sliding seat (621), the first sliding seat (621) is slidingly mounted on an inclined slide (63), the inclined slide (63) extends obliquely along a direction perpendicular to the rotation axis of the cam (61), the first sliding seat (621) is connected with the working end of a second linear driver (622), and the second linear driver (622) drives the first sliding seat (621) to reciprocate along the inclined slide (63) to change the amplitude of the detection table (4); The bicycle front fork strength detection equipment is used for detecting the bicycle front fork, the bicycle front fork includes a head tube (1), and a crown (11) installed on the head tube (1), the crown (11) is provided with two parallel stroke pipes (12), the stroke pipe (12) is inserted into the outer tube (2), the bottom of the outer tube (2) is provided with a claw hook (21), the connecting position of the stroke pipe (12) and the outer tube (2) is provided with a sealing element (22), characterized in that, The stroke tube (12) is coaxially provided with an extension rod (121), the outer tube (2) is provided with a partition ring (23), the partition ring (23) and the bottom of the outer tube (2) linearly form a buffer cavity (24), and the buffer cavity (24) is provided with an elastic element (241); The extension rod (121) passes through the partition ring (23) and enters the buffer cavity (24), the bottom of the extension rod (121) is provided with a piston head (122), the piston head (122) is attached to the inner wall of the buffer cavity (24), the elastic element (241) elastically connects the bottom of the piston head (122) and the bottom of the buffer cavity (24), and the elastic element (241) applies an elastic force to the piston head (122) to make it adhere to the bottom of the partition ring (23).

2. A bicycle fork strength testing apparatus according to claim 1, wherein, The bottom of the detection table (4) is provided with a plurality of guide rods (42) extending vertically downward, the base (3) is provided with a guide sleeve (31) in the same straight line as the axis of the guide rod (42), the guide rod (42) is inserted into the guide sleeve (31), and the guide sleeve (31) is provided with a spring (311) outside, and the spring (311) elastically connects the base (3) and the detection table (4).

3. A bicycle fork strength testing apparatus as defined in claim 1, wherein, The head tube clamp (5) comprises a sleeve (51) for sleeving on the head tube (1), the sleeve (51) is mounted on a moving table (52), the moving table (52) is fixedly mounted on the working end of a first linear driver (53), the working end of the first linear driver (53) is arranged to move in the vertical direction, and the first linear driver (53) is mounted on the base (3); The moving table (52) is further provided with a pressing sleeve (521) in the same straight line as the axis of the sleeve (51), the pressing sleeve (521) is located above the sleeve (51), and the pressing sleeve (521) presses the top of the head tube (1).

4. A bicycle fork strength testing apparatus as defined in claim 3, wherein, The working end of the second linear driver (622) is arranged to move in the horizontal direction, a second sliding seat (623) is mounted on the working end of the second linear driver (622), the bottom of the first sliding seat (621) is provided with a connecting rod (624), and the connecting rod (624) is vertically inserted into the second sliding seat (623).

5. A bicycle fork strength testing apparatus as defined in claim 4, wherein, The moving table (52) of the head tube clamp (5) is fixedly provided with a laser range finder (54), the working end of the laser range finder (54) is vertically arranged downwards, the first linear driver (53) drives the moving table (52) to move upwards to the upper side of the sleeve (51) and be flush with the top end of the head tube (1), and the laser range finder (54) detects the distance between the upper surface of the detection table (4) and the laser range finder (54); The base (3) is provided with a height fixing assembly (32), and the height fixing assembly (32) is used for fixing the height position of the detection table (4).

6. A bicycle fork strength testing apparatus as defined in claim 5, wherein, The height fixing assembly (32) comprises a base (321) and a supporting block (322) mounted on the base (321), the base (321) is provided with a vertical guide hole (323), the base (321) is slidably mounted on the slide rod (33) provided on the base (3) through the guide hole (323), and when the base (321) moves upwards along the slide rod (33) to abut against the gasket (43) at the bottom of the detection table (4), the supporting block (322) supports the detection table (4).

7. A bicycle fork strength testing apparatus as defined in claim 6, wherein, The base (321) is arranged at the lower end of the inclined slide (63), the bottom of the base (321) is provided with an abutting block (324), and the bottom of the abutting block (324) is provided with a slope (325) inclined towards the upper side of the inclined slide (63); The second sliding seat (623) is fixedly provided with a horizontally extending top block (625) at one end thereof facing the height fixing assembly (32), and when the second sliding seat (623) moves towards one end of the height fixing assembly (32) driven by the second linear driver (622), the top block (625) drives the slope (325) at the bottom of the abutting block (324) to move the base (321) upwards.

8. A bicycle fork strength testing apparatus according to claim 7, wherein, The base (321) is provided with a threaded sleeve (326), the axis of the threaded sleeve (326) is vertically arranged, the supporting block (322) is screw-mounted in the threaded sleeve (326) through a vertically arranged screw rod (327) at the bottom, and a locking bolt (328) for locking the height position of the supporting block (322) is screw-mounted on the screw rod (327).

9. A method for testing the strength of a bicycle front fork, implemented by using the bicycle front fork strength testing device according to any one of claims 1-8, characterized in that, The method comprises the following steps: Step one, mounting the front fork on the detection table (4), inserting the seat (41) into the bottom of the front fork, and fixing the head tube of the front fork by the head tube clamp (5); Step two, starting the vibration simulation unit (6), and driving the cam (61) to rotate by the rotary driver (62) to drive the detection table (4) to vibrate; Step three, starting the second linear driver (622) to drive the cam (61) to move and change the amplitude of the detection table (4) to simulate daily vibration; Step four, removing the vibrated front fork for detection.

Images