A crane jib mechanical component vibration testing device

Abstract

The present application belongs to the technical field of mechanical component testing, and in particular to a crane boom mechanical component vibration testing device, which solves the problems that the existing vibration signal catcher cannot accurately detect the vibration of a horizontal suspension boom, the testing device is large in size and inconvenient to install, the detection efficiency is low, and the device cannot detect according to the actual weather conditions. The device comprises a detection chamber and an equipment base. An adjusting structure is arranged in the base, which can drive the vertical rack to rotate and vibrate up and down. The detection chamber has a simulation structure, which can simulate various weather environments. Detection structures are arranged on the vertical rack and the horizontal suspension boom. A mobile carrier drives an L-shaped fixed clamping plate to clamp the horizontal suspension boom through a lead screw lever and a linkage connecting rod. A bottom electromagnet I increases the friction force. An attachment fixed plate is connected to a sliding guide block through a universal ball, a telescopic sleeve, etc. An electromagnet II makes the attachment fixed plate tightly adhere to the horizontal suspension boom. The device can simulate various environments, ensure stable installation of the detection equipment, and accurately detect the boom vibration frequency.

Description

Technical Field

[0001] This invention relates to the field of mechanical component testing technology, and in particular to a vibration testing device for mechanical components of a crane boom. Background Technology

[0002] During operation, crane booms are subjected to various dynamic loads, such as inertial forces during lifting and lowering of loads, wind loads, and vibrations generated by the movement of the trolley and crane. These dynamic loads cause the boom to vibrate. If the vibration frequency is close to the boom's natural frequency, resonance will occur. Prolonged resonance can lead to fatigue cracks in the boom structure, thereby reducing its strength and stability. Therefore, before cranes are assembled and shipped, stability testing is generally required, and boom vibration testing is a relatively important test item. This test is even more crucial for cantilever cranes, as they rely primarily on a cantilever structure to lift heavy objects; its structural characteristic is that one end is fixed, and the other end extends out to form a cantilever.

[0003] For example, the invention disclosed in CN119469638B is a vibration testing device for mechanical components of a crane boom. However, the above technical solution still has the following drawbacks in use:

[0004] 1. The above technical solution uses multiple vibration signal capture devices to detect the vibration of the horizontal suspension arm. However, during the detection, since the translation rack is slidably connected to the cantilever crane, when the horizontal suspension arm vibrates, the translation rack and the horizontal suspension arm vibrate simultaneously. However, due to their mass and shape, the translation rack and the horizontal suspension arm vibrate at different frequencies. Therefore, the vibration signal capture device connected to the translation rack cannot accurately detect the vibration of the horizontal suspension arm.

[0005] 2. When testing the horizontal suspension boom using a vibration signal capture device, it is necessary to connect it to the cantilever crane through multiple connectors. However, cantilever cranes are extremely large in reality, so the vibration testing device mentioned above is also quite large. This greatly increases the cost of the testing equipment, and the subsequent installation of the testing equipment and the cantilever crane is also extremely inconvenient, which greatly affects the testing efficiency.

[0006] 3. When conducting vibration testing on cantilever cranes, it is impossible to conduct testing based on actual weather conditions, resulting in insufficient testing accuracy. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing vibration signal capture devices, such as inaccurate detection of horizontal suspension boom vibration, large size of the testing device making installation inconvenient, low detection efficiency, and inability to perform testing based on actual weather conditions. Therefore, this invention proposes a vibration testing device for mechanical components of a crane boom.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A vibration testing device for mechanical components of a crane boom, comprising:

[0010] A detection chamber installed on a foundation and an equipment base fixedly embedded in the foundation, wherein the equipment base is located inside the detection chamber;

[0011] The equipment base is equipped with a mounting plate, and a vertical frame and a horizontal suspension arm are fixedly mounted on the top of the mounting plate;

[0012] The adjustment structure includes a support column fixed to the inner wall of the bottom of the equipment base and a sliding guide column slidably sleeved in the support column, wherein the sliding guide column is fixedly connected to the bottom of the mounting plate;

[0013] The simulated structure includes a wind duct that runs through the side wall of the detection chamber, a large ventilation fan fixed inside the wind duct, a water storage pan fixed to the inner wall of the top of the detection chamber, multiple spray nozzles fixed to the bottom of the water storage pan, and multiple heating element plates fixed to the inner walls of both sides of the detection chamber.

[0014] The detection structure includes a mobile vehicle mounted on a vertical frame and a horizontal suspension arm, and the bottom of the mobile vehicle is equipped with a vibration signal capture device;

[0015] The large ventilation fan drives airflow to impact the vertical frame and horizontal suspension arm; the spray nozzle sprays water to simulate a rainfall environment; the heating element regulates the temperature inside the detection chamber; the adjustment structure drives the mounting plate to rotate and vibrate up and down; and the vibration signal capture device detects vibration data in real time.

[0016] In one possible design, the simulation structure also includes a ventilation guide port fixed to the side of the detection chamber away from the large ventilation fan, and the top of the water storage pan is connected to an injection pipe that communicates with an external water source.

[0017] In one possible design, the adjustment structure further includes:

[0018] Gear I, fixed to the outer wall of the supporting column,

[0019] A drive motor is fixed to the inner wall of the bottom of the equipment base, and the output shaft of the drive motor is fixed with a gear II that meshes with gear I.

[0020] L-shaped support frames are fixed to both sides of the support column, and a drive transmission shaft is pivotally connected between the two L-shaped support frames. The drive transmission shaft passes through the support column and the sliding guide column.

[0021] Multiple cam mechanism components are fixedly sleeved on the outer wall of the drive transmission shaft, and the cam mechanism components abut against the bottom of the mounting plate;

[0022] The sliding guide post is provided with a clearance groove for the drive shaft to move.

[0023] In one possible design, the detection structure further includes:

[0024] A wire lever pivotally connected to the top of the mobile vehicle.

[0025] A sliding slide block that is slidably connected to the top of the mobile carrier and threadedly connected to a lever.

[0026] Rotate the two linkage rods connected to one side of the movable slide.

[0027] Two L-shaped fixing plates are slidably connected to the top of the mobile vehicle, and the two L-shaped fixing plates are respectively pivotally connected to the ends of two linkage rods.

[0028] Rotate the multiple electric drive wheels located on both sides of the mobile vehicle.

[0029] And multiple electromagnets I fixed to the bottom of the mobile vehicle.

[0030] In one possible design, the detection structure further includes:

[0031] A fixing sleeve that is fixedly mounted on the bottom of the mobile vehicle.

[0032] A sliding guide block that is slidably connected within a fixed sleeve.

[0033] Tension spring I is fixed between the inner wall of the top of the fixed sleeve and the top of the sliding guide block.

[0034] An attachment and fixing plate is located at the bottom of the sliding guide block.

[0035] Vibration signal catcher and multiple electromagnets II are embedded in the bottom of the attachment plate;

[0036] The magnetic attraction force generated by the electromagnet II when it is energized is greater than the tension force of the tension spring I.

[0037] In one possible design, a universal ball I is embedded at the bottom of the sliding guide block, and a fixed connecting rod is fixed at the bottom of the universal ball I;

[0038] The top of the attachment fixing plate is fitted with a universal ball II, and the top of the universal ball II is fixed with a telescopic sleeve;

[0039] The bottom end of the fixed connecting rod is slidably inserted into the telescopic sleeve and is connected to the inner wall of the bottom of the telescopic sleeve through tension spring II.

[0040] In one possible design, the two L-shaped fixing plates are provided with mounting grooves II on opposite sides, and multiple rolling wheels are rotatably connected in the mounting grooves II.

[0041] In one possible design, the mobile vehicle has curved surfaces on both sides, and the direction of the curved surfaces is perpendicular to the clamping direction of the L-shaped fixing plate.

[0042] In one possible design, the magnetic attraction between electromagnet II and the horizontal suspension arm is greater than the sum of the tension forces of tension spring I and tension spring II.

[0043] In one possible design, the two L-shaped fixing plates are provided with mounting grooves I, and a vertical rod is fixed in the mounting grooves I;

[0044] The outer wall of the vertical rod is slidably fitted with a pressure plate and an elastic spring.

[0045] The two ends of the elastic spring are respectively fixed to the bottom inner wall of the mounting groove I and the bottom of the pressure plate;

[0046] The pressure plate is fitted with a ball bearing at its top.

[0047] Beneficial effects: In this invention, a universal ball I is embedded at the bottom of the sliding guide block, a fixed connecting rod is fixed at the bottom of the universal ball I, a universal ball II is embedded at the top of the attachment fixing plate, a telescopic sleeve is fixed at the top of the universal ball II, the bottom end of the fixed connecting rod slides into the telescopic sleeve, and a tension spring II is fixed between the bottom end of the fixed connecting rod and the bottom inner wall of the telescopic sleeve through a spring seat; through the cooperation of the universal ball I, the fixed connecting rod, the telescopic sleeve, the tension spring II and the universal ball II, it can be ensured that even when the moving vehicle and the horizontal suspension arm have different vibration frequencies, the vibration signal capture device can still be closely attached to the horizontal suspension arm, so that the vibration signal capture device can accurately detect the vibration frequency of the horizontal suspension arm;

[0048] In this invention, the top of the mobile vehicle is slidably connected to a movable slide block that is threadedly connected to a lever. One side of the movable slide block is rotatably connected to two L-shaped fixed clamps via two linkage rods. The two L-shaped fixed clamps are slidably connected to the mobile vehicle. Multiple electromagnets I are fixed at the bottom of the mobile vehicle. The mobile vehicle can be easily installed on the horizontal suspension arm via the L-shaped fixed clamps. The magnetic force of the electromagnets I on the horizontal suspension arm can increase the friction between the electric drive wheel and the horizontal suspension arm. This not only allows the mobile vehicle to be easily installed on the horizontal suspension arm, but also enables the mobile vehicle to perform precise detection at different positions.

[0049] In this invention, a large ventilation fan is fixedly installed inside the air duct, and a ventilation guide port is fixedly installed on the side of the detection chamber away from the large ventilation fan. Multiple heating element plates are fixed on the inner walls of both sides of the detection chamber that are far apart from each other. A water storage tray is fixedly embedded in the top inner wall of the detection chamber, and multiple spray nozzles are fixed at the bottom of the water storage tray. The heating element plates, spray nozzles, large ventilation fan, and vibration structure simulate environments such as high temperature, rainy season, storm, and earthquake. The vibration of the vertical frame and horizontal suspension arm under different environments is detected by a mobile vehicle. The heating element plates, spray nozzles, large ventilation fan, and vibration structure can be combined with each other to more realistically simulate different weather conditions in reality.

[0050] In this invention, the simulation structure can comprehensively simulate various environments such as high temperature, rainy season, storm, and earthquake, more realistically reproducing real weather conditions. In the detection structure, the mobile carrier can be easily and stably installed on the horizontal suspension arm with the help of a screw lever, linkage rod, and L-shaped fixing plate. The bottom electromagnet I can also increase the friction between the electric drive wheel and the suspension arm, ensuring accurate detection of the mobile carrier at different positions. The attachment fixing plate, through the cooperation of components such as universal ball, telescopic sleeve, and tension spring, can ensure that even if the vibration frequency of the mobile carrier and the horizontal suspension arm are different, the vibration signal capture device can still closely adhere to the suspension arm and accurately detect its vibration frequency, providing a reliable guarantee for the quality inspection of the mechanical components of the crane boom. Attached Figure Description

[0051] Figure 1 A three-dimensional structural schematic diagram of a vibration testing device for mechanical components of a crane boom provided by the present invention;

[0052] Figure 2 A three-dimensional cross-sectional structural schematic diagram of a vibration testing device for mechanical components of a crane boom provided by the present invention;

[0053] Figure 3 A three-dimensional exploded structural diagram of the equipment base and mounting plate of a vibration testing device for mechanical components of a crane boom provided by the present invention;

[0054] Figure 4 A three-dimensional exploded structural diagram of the L-shaped support frame, sliding guide column, and support column of a vibration testing device for mechanical components of a crane boom provided by the present invention;

[0055] Figure 5 A three-dimensional cross-sectional view of the mounting plate and support column of a vibration testing device for mechanical components of a crane boom provided by the present invention;

[0056] Figure 6 A first-view three-dimensional structural diagram of the mobile carrier of a vibration testing device for mechanical components of a crane boom provided by the present invention;

[0057] Figure 7 This is a second-view three-dimensional structural diagram of the mobile carrier of a vibration testing device for mechanical components of a crane boom provided by the present invention.

[0058] Figure 8 A three-dimensional exploded view of the L-shaped fixed clamp, movable slide, and rolling wheel of a vibration testing device for mechanical components of a crane boom provided by the present invention;

[0059] Figure 9 A three-dimensional cross-sectional view of the fixing sleeve and the attachment fixing plate of a vibration testing device for mechanical components of a crane boom provided by the present invention;

[0060] Figure 10 This is a three-dimensional exploded structural diagram of the sliding guide block, the attachment fixing plate, the fixing connecting rod, and the telescopic sleeve of a vibration testing device for mechanical components of a crane boom provided by the present invention.

[0061] Figure 11 A three-dimensional structural diagram of the L-shaped fixing clamp and mounting groove II of the vibration testing device for mechanical components of a crane boom provided by the present invention;

[0062] Figure 12 This is a three-dimensional exploded view of the L-shaped fixed clamp, pressure plate, and rolling ball of a vibration testing device for mechanical components of a crane boom provided by the present invention.

[0063] In the diagram: 1. Detection chamber; 2. Vertical frame; 3. Horizontal suspension arm; 4. Heating element; 5. Spray nozzle; 6. Large ventilation fan; 7. Ventilation inlet; 8. Equipment base; 9. Mounting plate; 10. Support column; 11. Sliding guide column; 12. L-shaped support frame; 13. Drive shaft; 14. Cam mechanism; 15. Gear I; 16. Drive motor; 17. Gear II; 18. Mobile carrier; 19. L-shaped fixing plate; 20. Rolling wheel; 21. Lever; 22. Linkage rod; 3. Movable slide; 24. Electric drive wheel; 25. Electromagnet I; 26. Fixed sleeve; 27. Sliding guide block; 28. Tension spring I; 29. ​​Universal ball I; 30. Fixed connecting rod; 31. Telescopic sleeve; 32. Tension spring II; 33. Universal ball II; 34. Attachment fixing plate; 35. Vibration signal catcher; 36. Electromagnet II; 37. Mounting groove I; 38. Vertical rod; 39. Pressure plate; 40. Elastic spring; 41. Rolling ball; 42. Mounting groove II; 43. Clearance groove; 44. Water storage tray. Detailed Implementation

[0064] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0065] In one embodiment: Refer to Figure 1 and Figure 2 This testing device relates to the field of mechanical component testing technology. The device mainly includes a testing chamber 1 installed on a foundation and an equipment base 8 fixedly embedded in the foundation, with the equipment base 8 located inside the testing chamber 1. A mounting plate 9 is provided inside the equipment base 8, and a vertical frame 2 is fixedly mounted on the top of the mounting plate. A horizontal suspension arm 3 is provided on the vertical frame 2. The device is also equipped with an adjustment structure, a simulation structure, and a testing structure to achieve vibration testing of the vertical frame 2 and the horizontal suspension arm 3 under different environmental conditions.

[0066] Reference Figure 2 and Figure 3 The testing chamber 1 is welded from high-strength steel, providing excellent sealing and stability. Its dimensions are designed according to actual testing requirements. The equipment base 8 is also made of high-strength steel and is bolted to the foundation to ensure that it will not shake or shift during testing. The equipment base 8 is located at the center of the testing chamber 1, and its interior has space to accommodate the mounting plate 9 and other components.

[0067] Reference Figure 2 and Figure 3 The mounting plate 9 is a circular steel plate, which is bolted to the adjustment structure inside the equipment base 8. The vertical frame 2 is welded from I-beams, possessing high strength and rigidity, and its bottom is bolted to the top center of the mounting plate 9. The horizontal suspension arm 3 is horizontally welded to the top of the vertical frame 2.

[0068] Reference Figure 3 and Figure 4 The adjustment structure includes a support column 10 fixed to the inner wall of the bottom of the equipment base 8 and a sliding guide column 11 sliding within the support column 10. The support column 10 is a cylindrical steel tube. The sliding guide column 11 is also a cylindrical steel tube, with an outer diameter 2-7 mm smaller than the inner diameter of the support column 10, ensuring smooth sliding within the support column 10.

[0069] Reference Figures 3-5The adjustment structure also includes a gear I 15 fixed to the outer wall of the support column 10, and a drive motor 16 fixed to the bottom inner wall of the equipment base 8. A gear II 17 meshing with gear I 15 is fixed to the output shaft of the drive motor 16. Both gear I 15 and gear II 17 are made of high-strength alloy steel. The sliding guide column 11 is fixed to the bottom of the mounting plate 9. The drive motor 16 drives the mounting plate 9 and the vertical frame 2 to rotate through the engagement of gear I 15 and gear II 17, thereby withstanding wind forces from different wind directions. L-shaped support frames 12 are fixed to both sides of the support column 10. The L-shaped support frames 12 are made of angle steel, and their dimensions are designed according to the support strength requirements. The two L-shaped support frames 12 are rotatably connected to the same drive shaft 13 on their adjacent sides, with one end of the drive shaft 13 passing through the support column 10 and the sliding guide column 11. Multiple cam mechanism components 14 are fixedly sleeved on the outer wall of the drive shaft 13. The number of cam mechanism components 14 is determined according to the vibration amplitude and frequency requirements, and is generally 4-6. The cam mechanism components 14 cooperate with the mounting plate 9 to drive the mounting plate 9 to vibrate up and down. The sliding guide post 11 is provided with a clearance groove 43, which is used to make way for the drive shaft 13 when the sliding guide post 11 vibrates up and down. The width of the clearance groove 43 is 10-20 mm larger than the diameter of the drive shaft 13.

[0070] During the test, the drive motor 16 was started, and the motor output shaft drove gear II 17 to rotate. Gear II 17 meshed with gear I 15, thereby driving the support column 10, mounting plate 9, vertical frame 2, and horizontal suspension arm 3 to rotate. This allowed the vertical frame 2 and horizontal suspension arm 3 to withstand the wind force generated by the large ventilation fan 6 from different angles, and their vibration under different wind conditions was tested. At the same time, the drive transmission shaft 13 drove the cam mechanism 14 to rotate, and the cam mechanism 14 pushed the mounting plate 9 to vibrate up and down, simulating vibration environments such as earthquakes.

[0071] Reference Figure 1 and Figure 2The simulation structure includes a fixed air duct running through one side of the detection chamber 1, made of cylindrical steel pipe. A large ventilation fan 6, an axial flow fan, is fixedly installed inside the air duct. A ventilation guide vent 7 is fixedly installed on the side of the detection chamber 1 away from the large ventilation fan 6 to allow airflow within the detection chamber 1. Multiple heating element plates 4, made of resistance wire, are fixed to the inner walls of both sides of the detection chamber 1, and their number is determined according to the size of the detection chamber 1 and temperature control requirements. By controlling the number and power of the heating element plates 4, the temperature inside the detection chamber 1 can be controlled to simulate a high-temperature environment. A water storage tray 44, a circular stainless steel tray, is fixedly embedded in the inner wall of the top of the detection chamber 1. A liquid injection pipe is fixed to the top of the water storage tray 44, connected to an external water source, for injecting water into the water storage tray 44. Multiple spray nozzles 5 are fixed at the bottom of the water storage pan 44. By controlling the water flow rate and pressure of the spray nozzles 5, the rainy season environment can be simulated.

[0072] During testing, the vertical frame 2 is mounted on the mounting plate 9, and the large ventilation fan 6 is started. Air enters the testing chamber 1 through the air duct and then flows out from the ventilation guide 7, forming a wind circulation. The wind force can be controlled by adjusting the speed of the large ventilation fan 6. Simultaneously, according to testing requirements, the operation of the heating element 4 and the spray nozzle 5 is controlled to simulate environments such as high temperature, rainy season, storm, and earthquake. The heating element 4, spray nozzle 5, large ventilation fan 6, and vibration structure can work together to more realistically simulate different weather conditions in reality.

[0073] Reference Figures 6-8 The detection structure includes a mobile carrier 18, which is made of high-strength aluminum alloy, featuring light weight and high strength. A stainless steel lever 21 is rotatably connected to the top of the mobile carrier 18 via a base. A sliding slide 23, threadedly connected to the lever 21, is slidably connected to the top of the mobile carrier 18. The sliding slide 23 engages with the lever 21 via threads and can move axially when the lever 21 rotates. Two linkage rods 22, made of stainless steel, are rotatably connected to one side of the sliding slide 23, located on both sides of the lever 21. Two L-shaped fixing plates 19, made of high-strength steel, are slidably connected to the top of the mobile carrier 18. The ends of the two L-shaped fixing plates 19, close to each other, are rotatably connected to one end of each of the two linkage rods 22. The sliding slide 23, through the linkage rods 22, drives the two L-shaped fixing plates 19 to move towards each other, thus stably placing the mobile carrier 18 on the horizontal suspension arm 3.

[0074] Reference Figure 6 and Figure 8Each of the two L-shaped fixing plates 19 has a mounting groove II 42 on one side that is close to each other. Multiple rolling wheels 20 are rotatably connected in the mounting groove II 42. The rolling wheels 20 are rubber wheels. The rolling wheels 20 are used to reduce the friction between the L-shaped fixing plates 19 and the horizontal suspension arm 3 when the two L-shaped fixing plates 19 are in contact with the two sides of the horizontal suspension arm 3 to limit the movement of the mobile vehicle 18, so that the mobile vehicle 18 can move smoothly.

[0075] Reference Figure 6 and Figure 7 The mobile carrier 18 has multiple electrically driven wheels 24 rotatably mounted on both sides. These wheels are rubber wheels driven by DC motors. The electric drive wheels 24 are used to move the mobile carrier 18 along the horizontal suspension arm 3. Multiple electromagnets I 25 are fixed to the bottom of the mobile carrier 18. The attraction force of each electromagnet I 25 ranges from 500 to 1000 Newtons, and there are 4 to 8 electromagnets. The electromagnets I 25 increase the friction between the electric drive wheels 24 and the horizontal suspension arm 3, allowing the electric drive wheels 24 to move smoothly along the horizontal suspension arm 3.

[0076] When the mobile carrier 18 is placed on the horizontal suspension arm 3, the screw lever 21 is rotated, which drives the movable slide 23 to move to one side. The movable slide 23 moves the two L-shaped fixing plates 19 towards the center through the linkage 22. The two L-shaped fixing plates 19 clamp the two sides of the horizontal suspension arm 3, increasing the stability of the mobile carrier 18 and preventing it from sliding on the horizontal suspension arm 3 under different wind forces. At the same time, the electromagnet I 25 is energized to generate a strong magnetic force on the horizontal suspension arm 3, attracting the mobile carrier 18 to the horizontal suspension arm 3 and making the electric drive wheel 24 fit tightly against the horizontal suspension arm 3. This facilitates the movement of the mobile carrier 18 on the horizontal suspension arm 3 via the electric drive wheel 24, allowing the vibration signal capture device 35 to accurately detect at different positions on the horizontal suspension arm 3.

[0077] Reference Figure 7 and Figure 9The detection structure also includes a fixed sleeve 26, which is a cylindrical steel tube, fixedly embedded in the bottom of the mobile carrier 18. A sliding guide block 27, also a cylindrical steel block, is slidably connected inside the fixed sleeve 26, with a diameter 2-5 mm smaller than the inner diameter of the fixed sleeve 26. A tension spring I 28 is fixed between the top inner wall of the fixed sleeve 26 and the top of the sliding guide block 27 via a spring seat. The tension spring I 28 is a stainless steel spring with a wire diameter of 3-5 mm, an outer diameter of 20-30 mm, a free length of 100-150 mm, and a spring stiffness of 10-20 N / mm. An attachment plate 34, a circular steel plate, is provided at the bottom of the sliding guide block 27. A vibration signal catcher 35, using a high-precision accelerometer sensor, is fixedly embedded in the bottom of the attachment plate 34 to detect the vibration of the horizontal suspension arm 3. Multiple electromagnets II 36 are fixedly embedded in the bottom of the attachment plate 34. The attraction force of the electromagnets II 36 ranges from 800 to 1500 Newtons, and there are 2 to 4 of them. The electromagnets II 36 are used to attach the attachment plate 34 to the horizontal suspension arm 3, so that the vibration signal capture device 35 vibrates synchronously with the horizontal suspension arm 3.

[0078] Reference Figure 10 The bottom of the sliding guide block 27 is fitted with a universal ball I 29, and the bottom of the universal ball I 29 is fixed with a fixed connecting rod 30, which is a stainless steel rod. The top of the attachment fixing plate 34 is fitted with a universal ball II 33, and the top of the universal ball II 33 is fixed with a telescopic sleeve 31, which is a cylindrical steel tube. The bottom end of the fixed connecting rod 30 slides into the telescopic sleeve 31, and a tension spring II 32 is fixed between the bottom end of the fixed connecting rod 30 and the bottom inner wall of the telescopic sleeve 31 through a spring seat. The tension spring II 32 is a stainless steel spring with a wire diameter of 2-4 mm, an outer diameter of 15-25 mm, a free length of 80-120 mm, and a spring stiffness of 5-15 N / mm.

[0079] During testing, electromagnet II 36 is energized. The magnetic attraction force generated by electromagnet II 36 on the horizontal suspension arm 3 is greater than the sum of the tension forces of tension springs I 28 and II 32. At this time, the attachment plate 34 and the vibration signal capture device 35 are tightly attached to the top of the horizontal suspension arm 3, facilitating the detection by the vibration signal capture device 35. In addition, through the cooperation of the universal ball I 29, the fixed connecting rod 30, the telescopic sleeve 31, the tension spring II 32, and the universal ball II 33, it can be ensured that even when the moving vehicle 18 and the horizontal suspension arm 3 have different vibration frequencies, the vibration signal capture device 35 can still be tightly attached to the horizontal suspension arm 3, enabling the vibration signal capture device 35 to accurately detect the vibration frequency of the horizontal suspension arm 3.

[0080] Reference Figure 6The mobile carrier 18 has curved surfaces on both sides, and the two curved surfaces are arranged perpendicularly to the two L-shaped fixed clamps 19. The curved surface design is used to reduce the wind resistance of the mobile carrier 18 when it is blown by the wind generated by the large ventilation fan 6, and to prevent the mobile carrier 18 from moving on the horizontal suspension arm 3 under the action of wind.

[0081] In another embodiment: Refer to Figure 11 and Figure 12 An improvement upon Embodiment 1: Each of the two L-shaped fixing clamps 19 has a mounting groove I 37 located below the mounting groove II 42. A vertical rod 38, made of stainless steel, is fixed within each of the two mounting grooves I 37. Pressure plates 39, made of rectangular steel plates, are slidably fitted onto the outer walls of both vertical rods 38. The vertical rods 38 cooperate with the horizontal suspension arm 3 to clamp the mobile carrier 18 onto the horizontal suspension arm 3. An elastic spring 40, made of stainless steel, is fitted onto the outer wall of the vertical rod 38. The elastic spring 40 has a wire diameter of 2-3 mm, an outer diameter of 10-20 mm, a free length of 50-80 mm, and a spring stiffness of 3-8 Newtons / mm. The two ends of the elastic spring 40 are fixedly connected to the bottom inner wall of the mounting groove I 37 and the bottom of the pressure plate 39 respectively through spring seats. The top of the pressure plate 39 is fitted with rolling balls 41, which are steel balls with a diameter of 10-15 mm and number 3-5. The rolling balls 41 are used to reduce the friction between the pressure plate 39 and the horizontal suspension arm 3.

[0082] To enable the mobile carrier 18 to move stably on the vertical frame 2 and the horizontal suspension arm 3, taking the horizontal suspension arm 3 as an example, the elastic spring 40 and the pressure plate 39 work together to make the pressure plate 39 fit tightly against the inner wall of the top of the horizontal suspension arm 3, thereby enabling the mobile carrier 18 to be stably placed on the horizontal suspension arm 3. At the same time, when the mobile carrier 18 moves, the rolling ball 41 can reduce the friction between the pressure plate 39 and the horizontal suspension arm 3.

[0083] A precise sampling method for a vibration testing device for mechanical components of a crane boom includes the following steps:

[0084] S1. The detection chamber 1 is installed on the mounting plate 9. The heating element 4, the spray nozzle 5, the large ventilation fan 6, and the vibration structure simulate environments such as high temperature, rainy season, storm and earthquake. The vibration of the vertical frame 2 and the horizontal suspension arm 3 under different environments is detected by the mobile vehicle 18. The heating element 4, the spray nozzle 5, the large ventilation fan 6 and the vibration structure can be combined with each other to more realistically simulate different weather conditions in reality. The ventilation guide port 7 can make the air generated by the large ventilation fan 6 flow smoothly in the detection chamber 1.

[0085] S2. During the simulated earthquake, the drive shaft 13 is rotated by a motor, which in turn drives multiple cam mechanism components 14 to rotate. The cam mechanism components 14 cooperate with the mounting plate 9 to drive the mounting plate 9, the vertical frame 2, and the horizontal suspension arm 3 to vibrate. In addition, the gear II 17 is rotated by a motor, and the gear II 17 cooperates with the gear I 15 to drive the support column 10, the mounting plate 9, the vertical frame 2, and the horizontal suspension arm 3 to rotate. This allows the vertical frame 2 and the horizontal suspension arm 3 to withstand the wind force generated by the large ventilation fan 6 from different angles, and the vibration of the vertical frame 2 and the horizontal suspension arm 3 under different wind directions is detected.

[0086] S3. When detecting the vibration of the vertical frame 2 and the horizontal suspension arm 3 using the mobile carrier 18; taking the horizontal suspension arm 3 as an example, the mobile carrier 18 is placed on the horizontal suspension arm 3, and the screw lever 21 is rotated to drive the moving slide 23 to move to one side. The moving slide 23 moves the two L-shaped fixed clamps 19 to the middle through the linkage 22. The two L-shaped fixed clamps 19 are clamped on both sides of the horizontal suspension arm 3, and the rolling wheel 20 touches the horizontal suspension arm 3. This is used to reduce the distance between the L-shaped fixed clamps 19 and the horizontal suspension arm 3 when the L-shaped fixed clamps 19 are clamping the horizontal suspension arm 3. The friction between the horizontal suspension arms 3 and the movement of the mobile carrier 18 on the horizontal suspension arms 3 via the electric drive wheel 24 enable the vibration signal capture device 35 to perform vibration detection at different positions on the horizontal suspension arms 3. The cooperation of the two L-shaped fixing plates 19 can prevent the mobile carrier 18 from moving on the horizontal suspension arms 3 under the action of the wind force generated by the large ventilation fan 6. The inclined surfaces on both sides of the mobile carrier 18 can also reduce the wind pressure on the mobile carrier 18, making it easier for the vibration signal capture device 35 to stably adhere to the horizontal suspension arms 3 for detection.

[0087] S4. Electromagnet II 36 is energized. The magnetic attraction force generated by electromagnet II 36 on the horizontal suspension arm 3 is greater than the tension force of tension spring I 28. At this time, the attachment plate 34 and the vibration signal capture device 35 are tightly attached to the top of the horizontal suspension arm 3, which facilitates the detection by the vibration signal capture device 35. In addition, through the cooperation of universal ball I 29, fixed connecting rod 30, telescopic sleeve 31, tension spring II 32 and universal ball II 33, it can be ensured that when the moving vehicle 18 and the horizontal suspension arm 3 have different vibration frequencies, the vibration is detected. The signal capture device 35 can still be closely attached to the horizontal suspension arm 3, so that the vibration signal capture device 35 can accurately detect the vibration frequency of the horizontal suspension arm 3. When the electromagnet I 25 is energized, it generates a strong magnetic force on the horizontal suspension arm 3, which can attract the mobile vehicle 18 to the horizontal suspension arm 3 and make the electric drive wheel 24 closely attached to the horizontal suspension arm 3, so that the mobile vehicle 18 can move on the horizontal suspension arm 3 through the electric drive wheel 24, and the vibration signal capture device 35 can accurately detect at different positions on the horizontal suspension arm 3.

[0088] S5. In addition, the mobile carrier 18 can be easily installed on the vertical frame 2 and the horizontal suspension arm 3 through the cooperation of electromagnet I 25 and L-shaped fixing plate 19. The operation is simple, greatly improving the detection efficiency and reducing the detection cost.

[0089] S6. In order to enable the mobile carrier 18 to move stably on the vertical frame 2 and the horizontal suspension arm 3, taking the vertical frame 2 as an example, the elastic spring 40 and the pressure plate 39 cooperate to make the pressure plate 39 stick tightly to the inner wall of the top of the horizontal suspension arm 3, so that the mobile carrier 18 can be stably placed on the horizontal suspension arm 3. At the same time, when the mobile carrier 18 moves, the rolling ball 41 can reduce the friction between the pressure plate 39 and the horizontal suspension arm 3.

[0090] However, as is well known to those skilled in the art, the working principles and wiring methods of the large ventilation fan 6, heating element 4, drive motor 16, vibration signal capture device 35, electromagnet I 25 and electromagnet II 36 are commonplace and belong to conventional means or common knowledge. They will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0091] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0092] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A vibration testing device for mechanical components of a crane boom, characterized in that, include: The detection chamber (1) is installed on the foundation and the equipment base (8) is fixedly embedded in the foundation, wherein the equipment base (8) is located inside the detection chamber (1); The equipment base (8) is provided with a mounting plate (9), and a vertical frame (2) and a horizontal suspension arm (3) are fixedly installed on the top of the mounting plate (9). The adjustment structure includes a support column (10) fixed to the inner wall of the bottom of the equipment base (8) and a sliding guide column (11) slidably sleeved in the support column (10). The sliding guide column (11) is fixedly connected to the bottom of the mounting plate (9). The simulated structure includes a duct that runs through the side wall of the detection chamber (1), a large ventilation fan (6) fixed inside the duct, a water storage pan (44) fixed to the top inner wall of the detection chamber (1), multiple spray nozzles (5) fixed to the bottom of the water storage pan (44), and multiple heating element plates (4) fixed to the inner walls on both sides of the detection chamber (1). The detection structure includes a mobile carrier (18) mounted on a vertical frame (2) and a horizontal suspension arm (3), and the bottom of the mobile carrier (18) is equipped with a vibration signal catcher (35). Among them, the large ventilation fan (6) drives the airflow to impact the vertical frame (2) and the horizontal suspension arm (3), the spray nozzle (5) sprays water to simulate the rainfall environment, the heating element (4) regulates the temperature inside the detection chamber (1), the adjustment structure drives the mounting plate (9) to rotate and vibrate up and down, and the vibration signal capture device (35) detects vibration data in real time; The detection structure also includes: A wire lever (21) is pivotally connected to the top of the mobile carrier (18). A sliding slide (23) is slidably connected to the top of the mobile carrier (18) and threadedly connected to the wire lever (21). Rotate the two linkage rods (22) connected to one side of the movable slide (23). Two L-shaped fixed clamps (19) are slidably connected to the top of the mobile vehicle (18), and the two L-shaped fixed clamps (19) are respectively pivotally connected to the ends of two linkage rods (22). Rotate multiple electric drive wheels (24) located on both sides of the mobile carrier (18). And multiple electromagnets I (25) fixed to the bottom of the mobile vehicle (18).

2. The vibration testing device for mechanical components of a crane boom according to claim 1, characterized in that, The simulation structure also includes a ventilation guide port (7) fixed on the side of the detection chamber (1) away from the large ventilation fan (6), and the top of the water storage plate (44) is connected to an injection pipe that communicates with an external water source.

3. The vibration testing device for mechanical components of a crane boom according to claim 2, characterized in that, The adjustment structure further includes: Gear I (15) is fixed to the outer wall of the support column (10). A drive motor (16) is fixed to the inner wall of the bottom of the equipment base (8), and the output shaft of the drive motor (16) is fixed with a gear II (17) that meshes with gear I (15). L-shaped support frames (12) are fixed on both sides of the support column (10). A drive shaft (13) is pivotally connected between the two L-shaped support frames (12). The drive shaft (13) passes through the support column (10) and the sliding guide column (11). Multiple cam mechanism components (14) are fixedly sleeved on the outer wall of the drive transmission shaft (13), and the cam mechanism components (14) abut against the bottom of the mounting plate (9); The sliding guide post (11) is provided with a clearance groove (43) for the drive shaft (13) to move.

4. The vibration testing device for mechanical components of a crane boom according to claim 3, characterized in that, The detection structure also includes: A fixing sleeve (26) is fixedly installed at the bottom of the mobile vehicle (18). The sliding guide block (27) is slidably connected inside the fixed sleeve (26). A tension spring I (28) is fixed between the top inner wall of the fixed sleeve (26) and the top of the sliding guide block (27). An attachment fixing plate (34) is provided at the bottom of the sliding guide block (27). Vibration signal catcher (35) and multiple electromagnets II (36) are embedded in the bottom of the attachment plate (34). When the electromagnet II (36) is energized, the magnetic attraction force generated is greater than the tension force of the tension spring I (28).

5. The vibration testing device for mechanical components of a crane boom according to claim 4, characterized in that, The bottom of the sliding guide block (27) is fitted with a universal ball I (29), and the bottom of the universal ball I (29) is fixed with a fixed connecting rod (30). The top of the attachment fixing plate (34) is fitted with a universal ball II (33), and the top of the universal ball II (33) is fixed with a telescopic sleeve (31). The bottom end of the fixed connecting rod (30) is slidably inserted into the telescopic sleeve (31) and connected to the bottom inner wall of the telescopic sleeve (31) by the tension spring II (32).

6. The vibration testing device for mechanical components of a crane boom according to claim 5, characterized in that, The two L-shaped fixing plates (19) are provided with mounting grooves II (42) on opposite sides, and multiple rolling wheels (20) are rotatably connected in the mounting grooves II (42).

7. A vibration testing device for mechanical components of a crane boom according to claim 6, characterized in that, The mobile carrier (18) has curved surfaces on both sides, and the direction of the curved surfaces is perpendicular to the clamping direction of the L-shaped fixed clamp (19).

8. A vibration testing device for mechanical components of a crane boom according to claim 7, characterized in that, The magnetic attraction between the electromagnet II (36) and the horizontal suspension arm (3) is greater than the sum of the tension forces of the tension spring I (28) and the tension spring II (32).

9. A vibration testing device for mechanical components of a crane boom according to claim 8, characterized in that, The two L-shaped fixing plates (19) are provided with mounting grooves I (37), and a vertical rod (38) is fixed in the mounting grooves I (37); The outer wall of the vertical rod (38) is slidably fitted with a pressure plate (39) and an elastic spring (40). The two ends of the elastic spring (40) are respectively fixed to the bottom inner wall of the mounting groove I (37) and the bottom of the pressure plate (39); The pressure plate (39) is fitted with a ball bearing (41) on its top.

Images