Bicycle front fork, strength detection equipment and detection method

Abstract

The invention relates to the field of bicycle strength testing, in particular to a bicycle front fork, strength detection equipment and detection method.The detection equipment comprises a base and a detection table elastically installed on the base, the detection table is provided with an insertion base, the insertion base is connected with a claw hook at the bottom end of an outer pipe, and the base is provided with a head pipe clamp; the vibration simulation unit drives the detection table to reciprocate in the vertical direction and comprises a cam and a rotary driver, the cam is in transmission connection with the working end of the rotary driver, and the peripheral side of the cam is attached to the bottom of the detection table; the rotary driver is fixedly installed on the first sliding seat, the first sliding seat is installed on the inclined sliding way in a sliding mode, the inclined sliding way obliquely extends in the direction perpendicular to the cam rotating shaft, and the first sliding seat is connected with the working end of the second linear driver. According to the technical scheme, the second linear driver drives the first sliding seat to drive the cam to reciprocate along the inclined slide way to change the amplitude of the detection table, and the shock resistance of the front fork to vibrations with different intensities is detected.

Description

Technical Field

[0001] The invention relates to the field of bicycle strength testing, and in particular to a bicycle front fork, strength testing equipment and a testing method. Background Art

[0002] The front fork component is located in the front part of the bicycle structure. Its upper end is connected to 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, forming the guidance system of the bicycle. Turning the handlebar and the front fork can change the direction of the front wheel and play a guiding role in the bicycle. The stress condition of the front fork component is the same as that of the cantilever beam, so the front fork component must have sufficient strength. Therefore, the quality inspection of the front fork component is very important.

[0003] Bicycle front fork testing equipment is a device commonly used for front fork quality inspection, usually including a base, a fixing mechanism and an impact assembly. During the inspection, the front fork to be inspected is first fixed in the fixing mechanism, and then the front fork to be inspected is impacted by the impact assembly. Finally, the damage of the front fork is checked to determine the strength of the front fork. However, the impact force on the front fork is constant, and it is impossible to simulate the impact of real bumpy road conditions on the front fork. It is also impossible to detect whether the recovery ability of the front fork with a shock absorbing function after the impact simulation can keep the front fork at a normal height. The shock absorbing ability of the front fork decreases after daily use, and the lowered height position of the head tube causes the user's riding posture to change, which increases the user's physical burden. Summary of the invention

[0004] In view of the above problems, it is necessary to provide a bicycle front fork, strength testing equipment and testing method to address the existing technical problems.

[0005] In order to solve the problems of the prior art, the technical solution adopted by the present invention is:

[0006] A bicycle front fork comprises a head tube and a fork crown installed on the head tube, wherein two parallel stroke tubes are arranged on the fork crown, the stroke tubes are inserted into an outer tube, a claw hook is arranged at the bottom of the outer tube, a sealing member is arranged at the connection position between the stroke tube and the outer tube, an extension rod is coaxially arranged in the stroke tube, a separation ring is arranged in the outer tube, the separation ring and the bottom of the outer tube form a buffer cavity in a straight line, and an elastic member is arranged in the buffer cavity; the extension rod passes through the separation ring and enters the buffer cavity, a piston head is arranged at the bottom of the extension rod, the peripheral side of the piston head fits the inner wall of the buffer cavity, the elastic member elastically connects the bottom of the piston head with the bottom of the buffer cavity, and the elastic member applies elastic force to the piston head to move up and fit the bottom of the separation ring.

[0007] A bicycle front fork strength testing device is applied to a bicycle front fork, comprising a base and a testing platform elastically mounted on the base, wherein a plug-in seat is arranged on the testing platform, the plug-in seat is connected to a claw hook at the bottom end of an outer tube, and a head tube clamp is arranged on the base, and the head tube clamp is used to clamp and fix the head tube; a vibration simulation unit is arranged on the base, and the vibration simulation unit drives the testing platform to reciprocate in a vertical direction, and the vibration simulation unit comprises a cam and a rotary driver, the cam is transmission-connected to a working end of the rotary driver, the axis of the cam is horizontally arranged, and the circumference of the cam is in contact with the bottom of the testing platform; the rotary driver is fixedly mounted on a first slide, and the first slide is slidably mounted on an inclined slide, and the inclined slide extends obliquely in a direction perpendicular to the rotation axis of the cam, the first slide is connected to the working end of a second linear driver, and the second linear driver drives the first slide to reciprocate along the inclined slide to change the amplitude of the testing platform.

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

[0009] Preferably, the head pipe clamp includes a sleeve for being sleeved on the head pipe, the sleeve is mounted on a movable platform, the movable platform is fixedly mounted on a working end of a first linear drive, the working end of the first linear drive is arranged to move in a vertical direction, and the first linear drive is mounted on a base; a pressing sleeve which is in the same straight line as the axis of the sleeve is also arranged on the movable platform, the pressing sleeve is located above the sleeve, and the pressing sleeve presses the top of the head pipe.

[0010] Preferably, the working end of the second linear drive is arranged to move in the horizontal direction, a second slide is mounted on the working end of the second linear drive, a connecting rod is arranged at the bottom of the first slide, and the connecting rod is vertically inserted in the second slide.

[0011] Preferably, the movable platform of the head pipe clamp is fixedly installed with a laser rangefinder, and the working end of the laser rangefinder is arranged vertically downward. The first linear drive drives the movable platform to move up to the upper side of the sleeve and is flush with the top end of the head pipe, and the laser rangefinder detects the distance between the upper surface of the detection platform and the laser rangefinder; a height fixing component is arranged on the base, and the height fixing component is used to fix the height position of the detection platform.

[0012] Preferably, the height fixing assembly includes a base and a support block installed on the base. A vertical guide hole is provided on the base. The base is slidably installed on a slide rod provided on the base through the guide hole. When the base moves up along the slide rod until the support block is in contact with the gasket at the bottom of the testing platform, the support block supports the testing platform.

[0013] Preferably, the base is arranged at the lower end of the inclined slide, a fitting block is arranged at the bottom of the base, and the bottom of the fitting block is arranged with an inclined surface inclined upward toward the inclined slide; a horizontally extending top block is fixedly installed at one end of the second slide toward the height fixing component, and when the second linear drive drives the second slide to move toward one end of the height fixing component, the top block causes the inclined surface at the bottom of the fitting block to drive the base to move upward.

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

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

[0016] Step 1: Install the front fork on the test bench, fix the bottom of the front fork with the insert seat, and fix the head tube of the front fork with the head tube clamp;

[0017] Step 2: Start the vibration simulation unit, and the rotary driver drives the cam to rotate and drive the test platform to vibrate;

[0018] Step 3: Start the second linear drive to drive the cam to move and change the amplitude of the test platform to simulate daily vibration;

[0019] Step 4: Remove the vibrated front fork for testing.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] Firstly, in the present invention, the circumferential side of the cam is fitted into the bottom of the test platform so that when the cam rotates, the test platform on which the front fork is fixed is driven to vibrate. The rotating driver changes the rotation speed of the cam to change the vibration frequency of the front fork. The rotating driver is slidably installed on the inclined slide, and the position of the cam on the inclined slide is changed to simulate different vibration amplitudes, which can not only detect the seismic resistance of the front fork to vibrations of different intensities, but also make the detection environment of the front fork more realistic.

[0022] Secondly, the present invention uses a laser rangefinder to detect the distance between the top of the front fork and the test platform twice before and after the test, and compares the two data to determine whether the length of the elastic part of the front fork changes after the test, thereby determining the strength of the front fork facing bumpy roads. A height-fixing component is also provided on the base, and the height-fixing component is used to fix the height position of the test platform before and after each test.

[0023] Thirdly, the present invention ensures that the height position of the detection platform is at the same position before and after the vibration simulation unit is started through the height-fixing component, thereby ensuring the consistency of the detection surface position of the laser rangefinder and avoiding errors in the detection data. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a stereogram of a bicycle front fork;

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

[0026] Figure 3 It is a stereoscopic diagram of a bicycle front fork strength testing device in a non-working state;

[0027] Figure 4 yes Figure 3 A local enlarged view of point A;

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

[0029] Figure 6 yes Figure 5 A partial enlarged view of point B;

[0030] Figure 7 It is a stereoscopic diagram of a bicycle front fork strength testing device in working condition;

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

[0032] Fig. 9 It is a three-dimensional structural exploded diagram of a bicycle front fork strength testing device.

[0033] The numbers in the figure are: 1, head tube; 11, fork crown; 12, stroke tube; 121, extension rod; 122, piston head; 2, outer tube; 21, claw hook; 22, seal; 23, separator ring; 24, buffer chamber; 241, elastic member; 3, base; 31, guide sleeve; 311, spring; 32, height setting component; 321, base; 322, support block; 323, guide hole; 324, fitting block; 325, inclined surface; 326, threaded sleeve; 327, screw; 32 8. Locking bolt; 33. Slide rod; 4. Inspection table; 41. Insertion seat; 42. Guide rod; 43. Gasket; 5. Head pipe clamp; 51. Sleeve; 52. Moving table; 521. Press sleeve; 53. First linear drive; 54. Laser rangefinder; 6. Vibration simulation unit; 61. Cam; 62. Rotary drive; 621. First slide seat; 622. Second linear drive; 623. Second slide seat; 624. Connecting rod; 625. Top block; 63. Inclined slideway. DETAILED DESCRIPTION

[0034] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0035] Reference Figure 1 and Figure 2 :

[0036] A bicycle front fork comprises a head tube 1 and a fork crown 11 mounted on the head tube 1, wherein the fork crown 11 is provided with two parallel stroke tubes 12, the stroke tube 12 is inserted into an outer tube 2, a claw hook 21 is provided at the bottom of the outer tube 2, a sealing member 22 is provided at the connection position between the stroke tube 12 and the outer tube 2, an extension rod 121 is coaxially arranged in the stroke tube 12, a separation ring 23 is provided in the outer tube 2, the separation ring 23 and the bottom of the outer tube 2 form a buffer cavity 24 in a straight line, and the buffer cavity 24 is provided with an elastic member 241; the extension rod 121 passes through the separation ring 23 and enters the buffer cavity 24, a piston head 122 is provided at the bottom of the extension rod 121, the circumference of the piston head 122 is in contact with the inner wall of the buffer cavity 24, the elastic member 241 elastically connects the bottom of the piston head 122 with the bottom of the buffer cavity 24, and the elastic member 241 applies elastic force to the piston head 122 to move upward and contact the bottom of the separation 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 installed on the fork crown 11 of the head tube 1. The stroke tube 12 is inserted into the outer tube 2. The stroke tube 12 moves along the axis of the outer tube 2 in the outer tube 2. A sealing member 22 is provided at the connection between the stroke tube 12 and the outer tube 2. The sealing member 22 is sealed by an oil seal or the like to ensure that the sealing of the connection is maintained when the stroke tube 12 and the outer tube 2 move relative to each other. In this embodiment, an extension rod 121 is provided inside the stroke tube 12 and inserted into a buffer cavity 24 formed by a separation ring 23 in the outer tube 2. The extension rod 121 is installed in the stroke tube 1 2 does not affect the sliding fit between 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 member 241 in the buffer chamber 24 applies elastic force to the piston head 122 at the bottom of the extension rod 121 to move up and fit the bottom of the separation ring 23. The elastic member 241 can be a mechanical spring, a gas spring or hydraulic oil. When the ground is bumpy, the upward movement of the outer tube 2 will compress the elastic member 241. The compression of the elastic member 241 absorbs vibration, reduces the vibration transmitted to the head tube 1, and realizes shock absorption. The elastic member 241 is located inside the outer tube 2, is not easily damaged by external forces, and keeps the front fork simple and beautiful.

[0038] Reference Figures 1 to 9 :

[0039] A bicycle front fork strength testing device is applied to a bicycle front fork, comprising a base 3 and a testing platform 4 elastically mounted on the base 3, wherein the testing platform 4 is provided with a plug-in seat 41, the plug-in seat 41 is connected to a claw hook 21 at the bottom end of an outer tube 2, and a head tube clamp 5 is provided on the base 3, and the head tube clamp 5 clamps and fixes the head tube 1; a vibration simulation unit 6 is provided on the base 3, and the vibration simulation unit 6 drives the testing platform 4 to reciprocate in the vertical direction, and the vibration simulation unit 6 comprises a cam 61 and a rotation driver 62, wherein the cam 61 is provided on the testing platform 4 and the rotation driver 62 is provided on the testing platform 4; The wheel 61 is transmission-connected to the working end of the rotary driver 62, the axis of the cam 61 is horizontally arranged, and the peripheral side of the cam 61 is in contact with the bottom of the detection platform 4; the rotary driver 62 is fixedly mounted on the first slide 621, and the first slide 621 is slidably mounted on the inclined slide 63, and the inclined slide 63 extends obliquely in a direction perpendicular to the rotation axis of the cam 61, and the first slide 621 is connected to the working end of the second linear driver 622, and the second linear driver 622 drives the first slide 621 to reciprocate along the inclined slide 63 to change the amplitude of the detection platform 4.

[0040] The front fork strength testing device in the present application simulates the bumping of the front fork and then tests whether the recovery ability of the elastic member 241 after the bump can make the head tube 1 return to the normal height, so as to avoid the elastic force of the elastic member 241 decreasing after daily use, resulting in a decrease in the shock absorption ability, and the head tube 1 decreasing in height, resulting in a change in the user's riding posture and increasing the body burden. During the test, the staff installs the claw hook 21 of the outer tube 2 on the insertion seat 41 of the test platform 4, and fixes the head tube 1 through the head tube clamp 5. When testing, the vibration simulation unit 6 on the base 3 is started to drive the test platform 4 in the vertical direction. The test bench 4 vibrates upward to simulate the bumps during daily riding. After the test bench 4 drives the outer tube 2 to vibrate for a period of time, the distance between the top of the head tube 1 and the bottom of the outer tube 2 is detected to determine the degree of deformation of the elastic member 241. In this embodiment, the vibration simulation unit 6 includes a cam 61 and a rotary driver 62. The circumference of the cam 61 fits the bottom of the test bench 4. The rotary driver 62 can be a servo motor. When the rotary driver 62 drives the cam 61 to rotate, the circumference of the cam 61, which is farther from the rotation axis of the cam 61, fits the bottom of the test bench 4, and the test bench 4 can be pushed upward. When the part of the side closer to the rotation axis of the cam 61 is in contact with the bottom of the detection platform 4, the detection platform 4 can be reset under the action of gravity, and the rotation driver 62 changes the rotation speed of the cam 61 to change the vibration frequency of the front fork; in this embodiment, the rotation driver 62 is slidably installed on the inclined slide 63 through the first slide 621, and the second linear driver 622 can drive the first slide 621 to drive the rotation driver 62 and the cam 61 to move on the inclined surface of the inclined slide 63. When the rotation driver 62 moves to the lower end of the inclined slide 63, the rotation axis of the cam 61 is at a distance from the bottom of the detection platform 4. The cam 61 is farther away from the detection platform 4, and the distance that the cam 61 can push the detection platform 4 to move up is shorter, and the pressure applied to the front fork is also smaller, simulating slight bumps. When the rotary driver 62 moves to the higher end of the inclined slide 63, the rotation axis of the cam 61 is closer to the bottom of the detection platform 4, and the cam 61 can push the detection platform 4 to move up a higher distance, and the pressure applied to the front fork is also larger, simulating strong bumps. By changing the position of the cam 61 on the inclined slide 63, different vibration amplitudes can be simulated, which can not only detect the shock resistance of the front fork to vibrations of different intensities, but also make the detection environment of the front fork more realistic.

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

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

[0043] The testing platform 4 in this embodiment is inserted into the guide sleeve 31 of the base 3 through the guide rod 42 at the bottom, ensuring that the testing platform 4 can stably reciprocate in the vertical direction during testing, and preventing the testing platform 4 from offsetting and bending the front fork fixed on the insertion seat 41. The spring 311 elastically connects the base 3 and the testing platform 4. The spring 311 cooperates with the gravity of the testing platform 4 to ensure that the bottom of the testing platform 4 can fit against the side of the cam 61, and can also keep the testing platform 4 at a certain height, so that when the first slide 621 moves to the lowest end of the inclined slide 63, the cam 61 can be separated from the testing platform 4 to stop the strength test of the front fork.

[0044] In order to solve the problem of how to ensure that the position of the head pipe 1 does not shift during vibration during strength testing, the following features are specifically set:

[0045] The head pipe clamp 5 includes a sleeve 51 for being sleeved on the head pipe 1, the sleeve 51 is installed on a movable platform 52, the movable platform 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 a vertical direction, and the first linear driver 53 is installed on a base 3; the movable platform 52 is also provided with a pressing sleeve 521 which is 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 pipe 1.

[0046] In this embodiment, the head pipe 1 is fixedly clamped by a head pipe clamp 5, and the head pipe clamp 5 includes a sleeve 51 and a pressing sleeve 521 installed on a movable platform 52. After the staff installs the claw hook 21 of the front fork on the insertion seat 41 of the detection platform 4, the head pipe 1 is kept vertical, and the first linear driver 53 drives the movable platform 52 to sleeve the sleeve 51 on the head pipe 1 from top to bottom, and moves down until the pressing sleeve 521 is sleeved on the head pipe 1 and fits the top of the head pipe 1 to press the head pipe 1. The sleeve 51 keeps the axis of the head pipe 1 stable, and the pressing sleeve 521 keeps the head pipe 1 from deflecting along the axis direction during the strength test, affecting the test effect of the elastic member 241. The sleeve 51 and the pressing sleeve 521 on the movable platform 52 can be replaced according to the size of the head pipe 1 to be tested. The first linear driver 53 can be a slide or other lifting structure, etc., which will not be described in detail here.

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

[0048] The working end of the second linear drive 622 is arranged to move in the horizontal direction. A second slide 623 is mounted on the working end of the second linear drive 622 . A connecting rod 624 is arranged at the bottom of the first slide 621 . The connecting rod 624 is vertically inserted into the second slide 623 .

[0049] The second linear drive 622 in this embodiment can be a flashlight push rod or a cylinder, etc. The working end of the second linear drive 622 is set to move in the horizontal direction. A connecting rod 624 is set at the bottom of the first slide 621 to be plugged and connected to the second slide 623 installed on the working end of the second linear drive 622. The connecting rod 624 can also be hinged at the bottom of the first slide 621. When the second slide 623 moves horizontally, it will drive the first slide 621 to move along the inclined surface of the inclined slide 63, and the connecting rod 624 moves synchronously in the vertical direction in the second slide 623.

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

[0051] The movable platform 52 of the head pipe clamp 5 is fixedly installed with a laser rangefinder 54, and the working end of the laser rangefinder 54 is set vertically downward. The first linear drive 53 drives the movable platform 52 to move up to the upper side of the sleeve 51 and is flush with the top of the head pipe 1. The laser rangefinder 54 detects the distance between the upper surface of the detection platform 4 and the laser rangefinder 54; the base 3 is provided with a height fixing component 32, which is used to fix the height position of the detection platform 4.

[0052] In this embodiment, a laser rangefinder 54 is installed on the movable platform 52 of the head tube clamp 5. When the staff fixes the head tube 1 of the front fork, the movable platform 52 moves down to the position where the sleeve 51 is aligned with the top of the head tube 1. At this time, the head tube 1 remains in a fixed position. The laser rangefinder 54 detects the distance between the working end of the laser rangefinder 54 and the surface of the detection platform 4. Then the movable platform 52 moves down to the pressing sleeve 521 to press and fix the head tube 1. After the vibration simulation is completed, the movable platform 52 moves up again to align the sleeve 51 with the top of the head tube 1. Then the laser rangefinder 54 measures the distance between the movable platform 52 and the detection platform 4 again. By comparing the two data, it is determined whether the length of the elastic member 241 of the front fork changes after the test, thereby determining the strength of the front fork facing the bumpy road. A height-fixing component 32 is also provided on the base 3. The height-fixing component 32 is used to fix the height position of the detection platform 4 before and after each detection, so as to ensure that the detection surface position of the laser rangefinder 54 is consistent and avoid errors in the detection data.

[0053] In order to understand how the high component 32 can keep the test platform 4 at the same height before and after the vibration simulation unit 6 is activated, the following features are specifically set:

[0054] The height-fixing component 32 includes a base 321 and a support block 322 installed on the base 321. A vertical guide hole 323 is provided on the base 321. The base 321 is slidably installed on a slide rod 33 provided on the base 3 through the guide hole 323. When the base 321 moves up along the slide rod 33 until the support block 322 is in contact with the gasket 43 at the bottom of the detection platform 4, the support block 322 supports the detection platform 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. The bottom of the fitting block 324 is arranged with an inclined surface 325 inclined upward toward the inclined slide 63; a horizontally extending top block 625 is fixedly installed at one end of the second slide 623 toward the height fixing component 32, and when the second linear drive 622 drives the second slide 623 to move toward one end of the height fixing component 32, the top block 625 causes the inclined surface 325 at the bottom of the fitting block 324 to drive the base 321 to move upward.

[0056] In this embodiment, the height-fixing assembly 32 includes a base 321 and a support block 322 slidably mounted on the slide rod 33. When the second linear actuator 622 of the vibration simulation unit 6 drives the second slide 623 and the first slide 621 to move to the lowest end of the inclined slide 63, the 635 on one side of the second slide 623 is horizontally inserted under the bonding block 324 at the bottom of the base 321, and in the process of contacting the inclined surface 325 at the bottom of the bonding block 324, the base 321 is lifted to the bottom of the support block 322 to bond with the detection table 4. The gasket 43 supports the test platform 4 to ensure that the height position of the test platform 4 is uniform. When the vibration simulation unit 6 is started, the second linear drive 622 drives the second slide 623 to move, and the first slide 621 moves up along the inclined slide 63 to contact the bottom of the test platform 4. The top block 625 moves away from the bonding block 324, so that the base 321 moves down under the action of gravity until the bonding block 324 contacts the base 3, and the support block 322 moves down to release the support for the test platform 4 so that the test platform 4 will not contact the support block 322 when it vibrates.

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

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

[0059] In this embodiment, the support block 322 is screwed in the threaded sleeve 326 of the base 321 through the screw 327 at the bottom. The screw 327 rotates in the threaded sleeve 326 to adjust the distance between the top of the support block 322 and the base 321. The locking bolt 328 locks the position of the screw 327, thereby ensuring that the support block 322 supports the test platform 4 so that the test platform 4 can stay at a suitable height position, thereby improving the applicability of the equipment.

[0060] Working principle: During the inspection, the staff installs the claw hook 21 of the outer tube 2 on the insertion seat 41 of the inspection platform 4. When fixing the head tube 1 of the front fork, the moving platform 52 moves down to the position where the sleeve 51 is aligned with the top of the head tube 1. At this time, the head tube 1 remains in a fixed position, and the laser rangefinder 54 detects the distance between the working end of the laser rangefinder 54 and the surface of the inspection platform 4. Then the moving platform 52 moves down to the pressing sleeve 521 to press and fix the head tube 1. During the inspection, the vibration simulation unit 6 on the base 3 starts to drive the inspection platform 4 to vibrate in the vertical direction to simulate the bumps in daily riding. The position of the cam 61 on the inclined slide 63 is changed to simulate different vibration amplitudes. When the vibration simulation is completed, the moving platform 52 moves up again to align the sleeve 51 with the top of the head tube 1. Then the laser rangefinder 54 is used to measure the distance between the moving platform 52 and the inspection platform 4 again. By comparing the two data, it is determined whether the length of the elastic member 241 of the front fork changes after the test, thereby determining the strength of the front fork facing bumpy roads.

[0061] A bicycle front fork strength detection method is implemented by using a bicycle front fork strength detection device, comprising the following steps:

[0062] Step 1: Install the front fork on the testing platform 4, fix the bottom of the front fork with the insert seat 41, and fix the head tube of the front fork with the head tube clamp 5;

[0063] Step 2: Start the vibration simulation unit 6, and the rotary driver 62 drives the cam 61 to rotate and drive the detection platform 4 to vibrate;

[0064] Step 3: Start the second linear drive 622 to drive the cam 61 to move and change the amplitude of the detection platform 4 to simulate daily vibration;

[0065] Step 4: Remove the vibrated front fork for testing.

[0066] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A bicycle front fork, comprising a head tube (1), and a fork crown (11) mounted on the head tube (1), wherein the fork crown (11) is provided with two parallel stroke tubes (12), the stroke tube (12) is inserted into an outer tube (2), a claw hook (21) is provided at the bottom of the outer tube (2), and a sealing member (22) is provided at the connection position between the stroke tube (12) and the outer tube (2), characterized in that: An extension rod (121) is coaxially arranged in the travel tube (12), a separation ring (23) is arranged in the outer tube (2), the separation ring (23) and the bottom of the outer tube (2) form a buffer cavity (24) in a straight line, and the buffer cavity (24) is provided with an elastic member (241); The extension rod (121) passes through the separation ring (23) and enters the buffer chamber (24); a piston head (122) is arranged at the bottom of the extension rod (121); the circumference of the piston head (122) is in contact with the inner wall of the buffer chamber (24); an elastic member (241) elastically connects the bottom of the piston head (122) and the bottom of the buffer chamber (24); the elastic member (241) applies elastic force to move the piston head (122) upward to contact the bottom of the separation ring (23).

2. A bicycle front fork strength testing device, applied to a bicycle front fork as claimed in claim 1, characterized in that: The invention comprises a base (3) and a detection platform (4) elastically mounted on the base (3); a plug-in seat (41) is arranged on the detection platform (4); the plug-in seat (41) is connected to a claw hook (21) at the bottom end of an outer tube (2); a head tube clamp (5) is arranged on the base (3); and the head tube clamp (5) clamps and fixes the head tube (1); A vibration simulation unit (6) is arranged on the base (3), and the vibration simulation unit (6) drives the detection platform (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 transmission-connected to the working end of the rotary driver (62). The axis of the cam (61) is arranged horizontally, and the circumference of the cam (61) is in contact with the bottom of the detection platform (4). The rotary driver (62) is fixedly mounted on a first slide (621), the first slide (621) is slidably mounted on an inclined slide (63), the inclined slide (63) extends obliquely in a direction perpendicular to the rotation axis of the cam (61), the first slide (621) is connected to a working end of a second linear driver (622), and the second linear driver (622) drives the first slide (621) to reciprocate along the inclined slide (63) to change the amplitude of the detection platform (4).

3. A bicycle front fork strength testing device according to claim 2, characterized in that: The bottom of the detection platform (4) is provided with a plurality of guide rods (42) extending vertically downward, the base (3) is provided with a guide sleeve (31) which is 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 outer sleeve of the guide sleeve (31) is provided with a spring (311), and the spring (311) elastically connects the base (3) and the detection platform (4).

4. A bicycle front fork strength testing device according to claim 2, characterized in that: The head pipe clamp (5) comprises a sleeve (51) for being sleeved on the head pipe (1), the sleeve (51) being mounted on a moving platform (52), the moving platform (52) being fixedly mounted on a working end of a first linear drive (53), the working end of the first linear drive (53) being arranged to move in a vertical direction, and the first linear drive (53) being mounted on a base (3); The movable platform (52) is also provided with a pressing sleeve (521) which is 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 pipe (1).

5. A bicycle front fork strength testing device according to claim 4, characterized in that: The working end of the second linear drive (622) is arranged to move in the horizontal direction, and a second slide seat (623) is installed on the working end of the second linear drive (622). A connecting rod (624) is arranged at the bottom of the first slide seat (621), and the connecting rod (624) is vertically inserted in the second slide seat (623).

6. A bicycle front fork strength testing device according to claim 5, characterized in that: The movable platform (52) of the head pipe clamp (5) is fixedly mounted with a laser rangefinder (54), the working end of the laser rangefinder (54) is arranged vertically downward, the first linear drive (53) drives the movable platform (52) to move upward to the upper side of the sleeve (51) and flush with the top end of the head pipe (1), and the laser rangefinder (54) detects the distance between the upper surface of the detection platform (4) and the laser rangefinder (54); The base (3) is provided with a height-fixing component (32), and the height-fixing component (32) is used to fix the height position of the detection platform (4).

7. A bicycle front fork strength testing device according to claim 6, characterized in that: The height-fixing component (32) comprises a base (321) and a support block (322) mounted on the base (321); a vertical guide hole (323) is provided on the base (321); the base (321) is slidably mounted on a slide bar (33) provided on the base (3) through the guide hole (323); when the base (321) moves up along the slide bar (33) until the support block (322) is in contact with a gasket (43) at the bottom of the detection platform (4), the support block (322) supports the detection platform (4).

8. A bicycle front fork strength testing device according to claim 7, characterized in that: The base (321) is arranged at a lower end of the inclined slide (63), a fitting block (324) is arranged at the bottom of the base (321), and a slope (325) inclined upward toward the inclined slide (63) is arranged at the bottom of the fitting block (324); A horizontally extending top block (625) is fixedly mounted on one end of the second slide (623) facing the height-fixing assembly (32). When the second linear driver (622) drives the second slide (623) to move toward one end of the height-fixing assembly (32), the top block (625) causes the inclined surface (325) at the bottom of the fitting block (324) to drive the base (321) to move upward.

9. A bicycle front fork strength testing device according to claim 8, characterized in that: The base (321) is provided with a threaded sleeve (326), the axis of which is vertically arranged, and the support block (322) is screwedly installed in the threaded sleeve (326) through a screw rod (327) vertically arranged at the bottom, and a locking bolt (328) for locking the height position of the support block (322) is screwedly installed on the screw rod (327).

10. A bicycle front fork strength detection method, implemented by using a bicycle front fork strength detection device according to any one of claims 2 to 9, characterized in that: The following steps are involved: Step 1: Install the front fork on the testing platform (4), fix the bottom of the front fork with the insert seat (41), and fix the head tube of the front fork with the head tube clamp (5); Step 2: Start the vibration simulation unit (6), and the rotary driver (62) drives the cam (61) to rotate and drive the detection platform (4) to vibrate; Step 3: Start the second linear drive (622) to drive the cam (61) to move and change the amplitude of the detection platform (4) to simulate daily vibration; Step 4: Remove the vibrated front fork for testing.

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