Heavy object drop test machine for frame front fork assembly

Abstract

The utility model discloses a heavy object drop testing machine for a frame front fork assembly, which belongs to the technical field of frame testing and comprises a carrying table, a supporting frame is arranged on the carrying table, and a rear axle tool is arranged on the carrying table in a heavy object drop testing space. A first mounting plate, a second mounting plate and a third mounting plate are sequentially arranged in the supporting frame from bottom to top; a front axle tool is arranged on the first mounting plate; a fixing sleeve is arranged on the lower end face of the third mounting plate, an electromagnet is arranged in the fixing sleeve, an impact hammer is arranged on the lower end face of the second mounting plate, a hammer handle of the impact hammer penetrates through the second mounting plate and extends into the fixing sleeve, and the end face of the extending end of the hammer handle is attached to the adsorption end face of the electromagnet; a steel wire rope of the winch penetrates through the top plate of the supporting frame and is connected with the upper end face of the third mounting plate. According to the utility model, the accurate control and release of the impact hammer are realized, and the accurate adjustment of the lifting height of the impact hammer in the test process is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle frame testing, in particular to a vehicle frame front fork assembly weight drop testing machine. Background Art

[0002] The frame and fork are the primary supporting components of many two-wheeled vehicles, including bicycles and electric vehicles. Their structural strength, resistance to external damage, and the stability of the connection between them have always been key indicators. Therefore, the midday drop test of the frame and fork assembly is a mandatory inspection item.

[0003] In existing weight drop tests on frame and fork assemblies, a steel ruler is used to measure the distance, and the operator manually controls the rise and fall, visually determining whether the height has been reached. The counterweight hammer is controlled by a pneumatic cylinder, clamping and releasing it. After the hammer is clamped and the zero position is determined, the motor is operated to pull the hammer upward. During the ascent, the end point height is determined closely using the steel ruler, and then the air supply to the cylinder is disconnected, allowing the hammer to fall naturally.

[0004] The solutions in the existing technology have the following disadvantages: 1. The impact hammer is controlled by a cylinder, which makes it easy to slip, and aging or damage to the air pipe can cause the impact hammer to fall suddenly, which may even threaten the personal safety of the operator in serious cases; 2. The rising height is not accurate, and it is not easy to adjust the end height by simply controlling it with a motor; 3. If the traction mechanism uses an electric hoist to control the start and stop, the delay is relatively large and the control is not very accurate. Summary of the Invention

[0005] In response to the problems existing in the existing technology, the utility model provides a frame and front fork assembly heavy object drop testing machine, which realizes the precise control and release of the impact hammer, avoids the safety hazards caused by the impact hammer's easy slipping and air pipe aging in traditional cylinder control; ensures that the impact hammer's rising height during the test is accurately adjustable, meeting the test needs.

[0006] The utility model is implemented as follows: a frame and front fork assembly weight drop test machine includes a carrier, a support frame is provided on the carrier, a weight drop test space for the frame and front fork assembly is formed in the support frame, a rear axle tooling for fixing the rear flat fork in the frame and front fork assembly is provided on the carrier located in the weight drop test space, a first mounting plate, a second mounting plate and a third mounting plate are sequentially provided in the support frame from bottom to top, a guide member is vertically provided on the carrier, and the first mounting plate, the second mounting plate and the third mounting plate can all move in the vertical direction of the guide member;

[0007] The first mounting plate is provided with a front axle tooling for fixing the front fork in the frame front fork assembly; the lower end surface of the third mounting plate is provided with a fixing sleeve, and an electromagnet is provided in the fixing sleeve; the lower end surface of the second mounting plate is provided with an impact hammer, and the hammer handle of the impact hammer passes through the second mounting plate and extends into the fixing sleeve. The protruding end surface of the hammer handle is in contact with the adsorption end surface of the electromagnet, and the electromagnet adsorbs the hammer handle when energized;

[0008] A winch is arranged on the upper end surface of the supporting frame, and a steel wire rope of the winch passes through the top plate of the supporting frame and is connected with the upper end surface of the third mounting plate.

[0009] Furthermore, an electromagnetic latch is provided on the outer wall of the fixing sleeve, and a through-hole is provided on the fixing sleeve for inserting the electromagnetic latch rod. The protruding end of the hammer handle is provided with an annular slot, and the electromagnetic latch rod is inserted into the annular slot through the through-hole. The combination of the electromagnet and the electromagnetic latch provides dual security for the fixation of the impact hammer. The electromagnet is responsible for the main adsorption function, while the electromagnetic latch inserts its rod into the annular slot of the hammer handle, forming a mechanical lock, further preventing the impact hammer from accidentally slipping or prematurely releasing during the test, forming a power-off protection mechanism, and improving the safety of the test process.

[0010] Furthermore, a pull-wire displacement sensor is provided on the top plate of the support frame, and the pull-wire of the pull-wire displacement sensor passes through the top plate of the support frame and is connected to the second mounting plate. The pull-wire displacement sensor can accurately measure the displacement of the impact hammer in real time. Through the electrical signal output by the sensor, the rising height and falling distance of the impact hammer during the test can be accurately known, providing a strong guarantee for the accuracy and reliability of the test data. Combined with the control system, the pull-wire displacement sensor can realize automatic control and adjustment of the rising height of the impact hammer. Through the preset displacement parameters, the system can automatically control the start and stop and rotation speed of the winch, so that the impact hammer moves according to the predetermined trajectory.

[0011] Furthermore, the front axle tooling includes two guide frames arranged opposite to each other on the upper end surface of the first mounting plate, a front axle is arranged between the two guide frames, and a roller is arranged on the front axle.

[0012] Furthermore, each guide frame is provided with a cylinder, the protruding end of the cylinder faces the lower end surface of the second mounting plate, and the protruding end of the cylinder is provided with an elastic pad. Through the expansion and contraction of the cylinder and the elastic pad, a buffering effect is played to prevent a secondary impact after the impact hammer falls.

[0013] Furthermore, one of the guide frames is equipped with a travel switch that controls the start and stop of the air cylinder. When the hammer falls beyond a certain point and hits the travel switch, the device that prevents a second impact is activated. Gas passes through a solenoid valve and directly acts on the safety cylinders on the left and right sides below the hammer, causing the cylinders to push out and support the hammer, effectively preventing it from falling a second time.

[0014] Furthermore, the rear axle tooling includes a rear axle seat arranged on the carrier, a mounting groove is provided on the rear axle seat, the rear axle is horizontally arranged in the mounting groove, and a rear axle cover block for limiting the rear axle is provided on the open side of the mounting groove.

[0015] Furthermore, the guide members are two guide posts, one on each side of the rear axle fixture. Both ends of the first, second, and third mounting plates are mounted on the two guide posts via linear bearings. This ensures the stability and stability of the mounting plates during lifting and lowering. This design effectively prevents the mounting plates from shaking or tilting when subjected to impact or vibration, thereby improving the accuracy and reliability of the test.

[0016] Furthermore, the hoist is driven by a stepper motor, which replaces the electric hoist for more precise control.

[0017] Furthermore, a clamp for fixing the position of the first mounting plate is provided on the guide member located below the first mounting plate.

[0018] The advantages and technical effects of the present invention are as follows: due to the adoption of the above technical scheme, the hammer handle is adsorbed and released by the electromagnet, thereby achieving precise control and release of the hammer, avoiding the safety hazards caused by the easy slipping of the hammer and aging of the air pipe in the traditional cylinder control; through the precise control of the winch and the guiding effect of the guide component, the rising height of the hammer during the test is ensured to be precisely adjustable, meeting the test requirements; the multi-level mounting plate design from bottom to top in the support frame, combined with the use of the guide component, makes the entire testing machine structure stable and able to withstand the impact force during the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a three-dimensional diagram of the overall structure provided by an embodiment of the utility model;

[0020] Figure 2 It is a schematic diagram of a partial structure provided by an embodiment of the utility model;

[0021] Figure 3 This is a schematic diagram of the connection structure between the impact hammer and the electromagnet provided in an embodiment of the utility model;

[0022] Figure 4This is a schematic diagram of the rear axle tooling structure provided by an embodiment of the utility model.

[0023] In the figure: 1. Carrier; 2. Support frame; 3. Rear axle tooling; 3-1. Rear axle seat; 3-2. Rear axle; 3-3. Rear axle cover block; 4. First mounting plate; 5. Second mounting plate; 6. Third mounting plate; 7. Guide member; 8. Front axle tooling; 8-1. Guide frame; 8-2. Front axle; 8-3. Roller; 9. Fixing sleeve; 10. Impact hammer; 10-1. Hammer handle; 10-2. Annular slot; 11. Winch; 12. Pull rope displacement sensor; 13. Clamp; 14. Electromagnetic latch; 15. Cylinder; 16. Elastic pad; 17. Travel switch; 18. Electromagnet. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] It should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0026] like Figures 1 to 4 As shown, the present application provides a frame-fork assembly weight drop test machine, comprising a carrier 1, a support frame 2 being provided on the carrier 1, a weight drop test space for the frame-fork assembly being formed within the support frame 2, a rear axle tooling 3 for fixing a rear flat fork in the frame-fork assembly being provided on the carrier 1 located within the weight drop test space, a first mounting plate 4, a second mounting plate 5, and a third mounting plate 6 being sequentially provided in the support frame 2 from bottom to top, a guide member 7 being vertically provided on the carrier 1, and the first mounting plate 4, the second mounting plate 5, and the third mounting plate 6 can all be moved in the vertical direction along the guide member 7;

[0027] The first mounting plate 4 is provided with a front axle tooling 8 for fixing the front fork in the frame front fork assembly; the lower end surface of the third mounting plate 6 is provided with a fixing sleeve 9, and the fixing sleeve 9 is provided with an electromagnet 18; the lower end surface of the second mounting plate 5 is provided with an impact hammer 10, and the hammer handle 10-1 of the impact hammer 10 passes through the second mounting plate 5 and extends into the fixing sleeve 9. The protruding end surface of the hammer handle 10-1 is in contact with the adsorption end surface of the electromagnet 18. When the electromagnet 18 is energized, the hammer handle 10-1 is adsorbed;

[0028] A hoist 11 is installed on the upper end of the support frame 2. The wire rope of the hoist 11 passes through the top plate of the support frame 2 and is connected to the upper end of the third mounting plate 6. Specifically, the drive source of the hoist 11 is a stepper motor. Stepper motors replace electric hoists for more precise control.

[0029] Furthermore, an electromagnetic latch 14 is provided on the outer wall of the fixing sleeve 9. The fixing sleeve 9 is provided with a through hole for inserting the rod of the electromagnetic latch 14. The protruding end of the hammer handle 10-1 is provided with an annular slot 10-2, and the rod of the electromagnetic latch 14 is inserted into the annular slot 10-2 through the through hole. The combination of the electromagnet 18 and the electromagnetic latch 14 provides dual protection for the fixation of the impact hammer 10. The electromagnet 18 is responsible for the main adsorption function, while the electromagnetic latch 14 is inserted into the annular slot 10-2 of the hammer handle 10-1 through its rod, forming a mechanical lock, further preventing the impact hammer 10 from accidentally slipping or prematurely releasing during the test, forming a power-off protection mechanism, and improving the safety of the test process.

[0030] Furthermore, a pull-wire displacement sensor 12 is provided on the top plate of the support frame 2, and the pull wire of the pull-wire displacement sensor 12 passes through the top plate of the support frame 2 and is connected to the second mounting plate 5. The pull-wire displacement sensor 12 can measure the displacement of the impact hammer 10 in real time and accurately. Through the electrical signal output by the sensor, the rising height and falling distance of the impact hammer 10 during the test can be accurately known, which provides a strong guarantee for the accuracy and reliability of the test data. Combined with the control system, the pull-wire displacement sensor 12 can realize automatic control and adjustment of the rising height of the impact hammer 10. Through the preset displacement parameters, the system can automatically control the start and stop and rotation speed of the winch 11, so that the impact hammer 10 moves according to the predetermined trajectory.

[0031] Furthermore, the front axle assembly 8 comprises two guide frames 8-1 positioned opposite each other on the upper end surface of the first mounting plate 4. A front axle 8-2 is positioned between the two guide frames 8-1, and rollers 8-3 are mounted on the front axle 8-2. Each guide frame 8-1 is equipped with a cylinder 15, with its protruding end facing the lower end surface of the second mounting plate 5. Elastic pads 16 are also attached to the protruding ends of the cylinders 15. The expansion and contraction of the cylinders 15 and the elastic pads 16 act as a buffer to prevent secondary impacts after the hammer 10 falls.

[0032] Preferably, one of the guide frames 8-1 is provided with a limit switch 17 for controlling the start and stop of the air cylinder 15. When the hammer 10 falls beyond a certain position and hits the limit switch 17, the device for preventing a second impact is activated. Gas passes through a solenoid valve and directly acts on the safety cylinders 15 on the left and right sides below the hammer 10, causing the cylinders 15 to push out, supporting the hammer 10 and effectively preventing the hammer 10 from falling a second time.

[0033] Furthermore, the rear axle tooling 3 includes a rear axle seat 3-1 arranged on the carrier 1, a mounting groove is provided on the rear axle seat 3-1, a rear axle 3-2 is horizontally arranged in the mounting groove, and a rear axle cover block 3-3 for limiting the rear axle 3-2 is provided on the open side of the mounting groove.

[0034] Specifically, the guide member 7 is a guide post, two of which are provided, one on each side of the rear axle fixture 3. Both ends of the first, second, and third mounting plates 4, 5, and 6 are mounted on the two guide posts via linear bearings. This ensures the stability and stability of the mounting plates during the lifting and lowering process. This design effectively prevents the mounting plates from shaking or tilting when subjected to impact or vibration, thereby improving the accuracy and reliability of the test.

[0035] Furthermore, a clamp 13 for fixing the position of the first mounting plate 4 is provided on the guide member 7 located below the first mounting plate 4 .

[0036] Working process: Assemble and tighten the frame and front fork components. Install the rear fork opening of the frame under test on rear axle 3-2 of rear axle fixture 3. Install the front fork opening of the frame under test on front axle 8-2 of front axle fixture 8, securing with the appropriate number of washers and nuts. Loosen the bolts on clamp 13, adjust cylinder 15 to the appropriate height so that front axle 8-2 is properly positioned in the front fork opening, and tighten the bolts.

[0037] The test begins, and the stepper motor and the drawstring encoder confirm the height. The PLC converts the required height setting on the touchscreen into the required number of pulses by converting pulse counts to distance. The PLC then transmits the required number of pulses to the stepper motor, which drives the hammer 10 upward. Simultaneously, the PLC uses feedback from the drawstring encoder's pulse count to form a closed loop and confirm the endpoint distance. Electromagnet 18 and electromagnetic latch 14 control the hammer 10.

[0038] The electromagnetic latch 14 is normally extended and retracted when powered. To raise the hammer 10, the electromagnetic latch 14 is first extended, and the electromagnet 18 is energized to attract the hammer 10. The electromagnetic latch 14 then automatically returns to its normal position. Once the hammer reaches its desired height, the electromagnetic latch 14 is retracted and the electromagnet 18 is de-energized, allowing the hammer 10 to descend. If a power outage occurs during operation, the extended electromagnetic latch 14 will lock the hammer 10 in place, preventing it from descending.

[0039] When the switch is flipped, the electromagnet 18 loses power and adsorption force, the electromagnetic plug 14 receives an electrical signal, and the insertion rod of the electromagnetic plug 14 is disengaged from the annular slot 10-2 of the hammer handle 10-1, causing the impact hammer 10 to fall and detect the deformation of the frame.

[0040] Due to the adoption of the above technical solution, the electromagnet 18 adsorbs and releases the hammer handle 10-1 of the impact hammer 10, thereby achieving precise control and release of the impact hammer 10, avoiding the safety hazards caused by the impact hammer 10 easily slipping and aging of the air pipe in the traditional cylinder 15 control; through the precise control of the winch 11, combined with the guiding effect of the guide member 7, the rising height of the impact hammer 10 during the test is ensured to be precisely adjustable, meeting the test requirements; the multi-level mounting plate design from bottom to top in the support frame 2, combined with the use of the guide member 7, makes the entire testing machine structure stable and able to withstand the impact force during the test.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A frame and front fork assembly weight drop tester, characterized in that: The invention comprises a platform, a support frame is provided on the platform, a weight drop test space for the frame and front fork assembly is formed in the support frame, a rear axle tooling for fixing the rear flat fork in the frame and front fork assembly is provided on the platform located in the weight drop test space, a first mounting plate, a second mounting plate and a third mounting plate are sequentially provided in the support frame from bottom to top, a guide member is vertically provided on the platform, and the first mounting plate, the second mounting plate and the third mounting plate can all be moved in the vertical direction of the guide member; The first mounting plate is provided with a front axle tooling for fixing the front fork in the frame front fork assembly; the lower end surface of the third mounting plate is provided with a fixing sleeve, and an electromagnet is provided in the fixing sleeve; the lower end surface of the second mounting plate is provided with an impact hammer, and the hammer handle of the impact hammer passes through the second mounting plate and extends into the fixing sleeve. The protruding end surface of the hammer handle is in contact with the adsorption end surface of the electromagnet, and the electromagnet adsorbs the hammer handle when energized; A winch is arranged on the upper end surface of the supporting frame, and a steel wire rope of the winch passes through the top plate of the supporting frame and is connected with the upper end surface of the third mounting plate.

2. The frame and front fork assembly weight drop testing machine according to claim 1, characterized in that: An electromagnetic latch is provided on the outer wall of the fixing sleeve, and a through hole is provided on the fixing sleeve for inserting the electromagnetic latch rod. An annular slot is provided at the protruding end of the hammer handle, and the electromagnetic latch rod is inserted into the annular slot through the through hole.

3. The frame and front fork assembly weight drop testing machine according to claim 1 or 2, characterized in that: A pull-wire displacement sensor is provided on the top plate of the support frame, and a pull wire of the pull-wire displacement sensor passes through the top plate of the support frame and is connected to the second mounting plate.

4. The frame and front fork assembly weight drop testing machine according to claim 1, characterized in that: The front axle tooling comprises two guide frames which are arranged opposite to each other on the upper end surface of the first mounting plate, a front axle is arranged between the two guide frames, and a roller is arranged on the front axle.

5. The frame and front fork assembly heavy object drop testing machine according to claim 4, characterized in that: A cylinder is provided on each guide frame, the protruding end of the cylinder faces the lower end surface of the second mounting plate, and an elastic pad is provided on the protruding end of the cylinder.

6. The frame and front fork assembly weight drop testing machine according to claim 5, characterized in that: A travel switch for controlling the start and stop of the cylinder is provided on one of the guide frames.

7. The frame and front fork assembly weight drop testing machine according to claim 1, characterized in that: The rear axle tooling includes a rear axle seat arranged on a carrier, a mounting groove is provided on the rear axle seat, the rear axle is horizontally arranged in the mounting groove, and a rear axle cover block for limiting the rear axle is provided on the opening side of the mounting groove.

8. The frame and front fork assembly weight drop testing machine according to claim 1, characterized in that: The guide member is a guide column, and two guide columns are provided. The two guide columns are respectively located on both sides of the rear axle tooling. Both ends of the first mounting plate, the second mounting plate and the third mounting plate are mounted on the two guide columns through linear bearings.

9. The frame and front fork assembly weight drop testing machine according to claim 1, characterized in that: The driving source of the hoist is a stepping motor.

10. The frame and front fork assembly weight drop testing machine according to claim 1, characterized in that: A hoop for fixing the position of the first mounting plate is provided on the guide member located below the first mounting plate.

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