A vibration test device for mechanical parts of crane boom

Abstract

The present 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, comprising a vibration platform fixedly arranged at the bottom, the top of the vibration platform being used to install a cantilever crane, a fixed platform being arranged on the left side of the vibration platform, a fixed steel frame being arranged on the top of the fixed platform, a cantilever displacement mechanism being installed on the fixed steel frame, the left end of the cantilever displacement mechanism being connected to an externally matched telescopic device, a lifting and lowering position control device being installed at the right end of the cantilever displacement mechanism, and position control testing devices being installed on the front and rear sides of the lifting and lowering position control device, respectively. The present invention can be installed inside a workshop to test the vibration state of a cantilever crane under different vibration simulation working conditions and obtain the vibration frequency and amplitude, effectively monitor whether different vibration points of the current cantilever crane have exceeded the safety threshold, and issue an alarm after timely uploading.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical component testing, in particular to a vibration testing device for mechanical components of a crane boom. Background Art

[0002] During operation, the crane boom is subject to various dynamic loads, such as inertia force when lifting and lowering heavy objects, wind load, vibration generated by the operation of the trolley and the carriage, etc. These dynamic loads will cause the boom to vibrate. If the vibration frequency is close to the natural frequency of the boom, resonance will occur. Long-term resonance will cause fatigue cracks in the boom structure, thereby reducing the strength and stability of the boom.

[0003] Therefore, before the crane is assembled and shipped out of the factory, it is generally necessary to test the stability of the crane, among which the boom vibration test is one of the relatively important test items. This test is even more important for cantilever cranes; since cantilever cranes mainly rely on cantilever structures to lift heavy objects, their structural characteristics are that one end is fixed and the other end extends to form a cantilever.

[0004] This structure causes a large bending moment when it bears heavy objects, especially when the heavy objects are far away from the end of the cantilever. In the case of vibration, since the cantilever generally has a large slenderness ratio, its own rigidity is relatively small. If the strength requirements cannot be met in the case of vibration, there will be a great safety hazard during its use.

[0005] After searching, it was found that a prior art document with patent application number CN201610238988.4 and IPC classification number G01M13 / 00(2006.01)I disclosed a vehicle crane combined boom test bench and its detection method, which mainly uses the combined boom test bench to perform functional inspection and assembly error test analysis on the combined boom components that have been assembled but not assembled as a whole. However, this detection test method has the following problems: First, it can only test a single boom component, while ignoring the impact of the boom-related lifting components, bottom fixing conditions, etc. in actual use under vibration conditions, and ignoring the vibration conditions of key hinged parts; second, the assembly conditions are taken into account, but the vibration amplitude of the boom itself under vibration conditions and the adverse effects caused by it cannot be directly monitored in real time under different positioning states.

[0006] Based on this, the present invention optimizes the design of the vibration conditions of the crane and the boom assembly under vibration conditions in the prior art, and specially designs a vibration testing device for the boom mechanical parts of a cantilever crane to better solve the problems existing in the prior art. Summary of the invention

[0007] The present invention solves one of the above-mentioned technical problems, and the technical solution adopted is: a vibration test device for the mechanical parts of a crane boom, characterized in that: it includes a vibration platform fixedly arranged at the bottom, the top of the vibration platform is used to install a cantilever crane, a fixed platform is arranged on the left side of the vibration platform, the bottom of the fixed platform is fixed on the ground, a fixed steel frame is arranged on the top of the fixed platform, a cantilever displacement mechanism is installed on the fixed steel frame, the left end of the cantilever displacement mechanism is connected to an external matching telescopic device, a lifting and lowering control device is installed on the right end of the cantilever displacement mechanism, and control test devices are respectively installed on the front and rear sides of the lifting and lowering control device, the two control test devices are independent of each other in the working state, and the two control test devices are respectively arranged on the front and rear sides of the cantilever crane and are used to complete the multi-point vibration state test of it.

[0008] In any of the above schemes, it is preferred that the cantilever shifting mechanism includes two guide shafts arranged in parallel and spaced apart from top to bottom, the left and right ends of each guide shaft respectively move through the axial holes of the guide shaft sleeve on the side wall of the fixed steel frame, the right end of each guide shaft is fixedly connected to the lifting and controlling device, and the left end of each guide shaft is connected to an external telescopic device, and the external telescopic device drives the two guide shafts to move synchronously in the left and right directions through telescoping.

[0009] In any of the above schemes, it is preferred that the lifting and lowering control device includes a translation frame installed at the right end of the cantilever shifting mechanism, and screw moving mechanisms are symmetrically provided on the front and rear sides of the translation frame, and the bottom of each screw moving mechanism is movably inserted into the bottom mounting hole of the translation frame, and the top of each screw moving mechanism is movably extended to the upper part of the translation frame and connected to the multi-tooth transmission unit, and the multi-tooth transmission unit is used to drive the two screw moving mechanisms to operate synchronously, and a rack moving mechanism is respectively installed on each of the screw moving mechanisms, and the two rack moving mechanisms clamp the cantilever crane in the middle, and a first vibration catcher, a second vibration catcher, a third vibration catcher, and a fourth vibration catcher are respectively installed on the inner side wall of each rack moving mechanism facing the cantilever crane.

[0010] In any of the above schemes, it is preferred that the screw moving mechanism includes two vertical screws respectively arranged vertically in the spaces on the left and right sides of the translation frame, the stepped shafts at the upper and lower ends of the vertical screw are movably extended to the mounting holes at the top and bottom of the translation frame, the top of the vertical screw is connected to the multi-tooth transmission unit, and lifting slides are respectively threadedly sleeved on the outer side walls of the two vertical screws, the rack moving mechanism is arranged between the two lifting slides, and the rack moving mechanism slides through the insertion holes arranged on the lifting slides and extend to both sides thereof.

[0011] In any of the above schemes, it is preferred that the rack movement mechanism includes a translation rack, and a rack driving part is respectively installed on the inner side of the left end of each translation rack; the two ends of the translation rack are respectively movably passed through the insertion holes corresponding to the lifting slide and extend to both sides thereof, and the first vibration catcher and the third vibration catcher are respectively movably hingedly installed in each ear seat at the inner side wall of the right end of the translation rack located on the rear side, and the second vibration catcher and the fourth vibration catcher are respectively movably hingedly installed in each ear seat at the inner side wall of the right end of the translation rack located on the front side.

[0012] In any of the above schemes, it is preferred that the rack drive member includes a translation drive motor fixedly mounted on the top of the translation frame, and a translation drive gear is fixedly mounted on the top of the motor shaft of the translation drive motor, and the translation drive gear is meshed with the translation rack on its corresponding side.

[0013] In any of the above schemes, it is preferred that the multi-tooth transmission unit includes four driven gears respectively fixed on the top of the vertical screw, and a central gear for simultaneously engaging with the four driven gears is arranged in the middle of the four driven gears, and the top of the gear shaft of the central gear is respectively connected to the motor shaft of the lifting drive motor, and the lifting drive motor is fixed to the top of the translation frame through a motor frame.

[0014] In any of the above schemes, preferably, a top test unit is installed in the top threaded hole of the translation frame above the stand of the cantilever crane; and a lower test unit is installed on the translation frame on the lower left side of the stand of the cantilever crane.

[0015] In any of the above schemes, preferably, a counterweight is installed at the bottom of the inner frame of the fixed steel frame, and the counterweight includes a fixed plate fixedly installed at the bottom of the inner frame, a central vertical shaft is fixedly installed at the top center of the fixed plate, and a plurality of counterweight blocks are movably sleeved and stacked on the outer side wall of the central vertical shaft.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention can be installed inside a workshop to test the vibration state of a cantilever crane under different vibration simulation conditions and obtain the vibration frequency and amplitude, effectively monitor whether different vibration points of the current cantilever crane have exceeded the safety threshold, and issue an alarm after timely uploading, thereby improving the safety of the cantilever crane in dealing with complex and multiple vibration conditions after leaving the factory.

[0018] 2. When in use, the vibration test device for the mechanical parts of the crane boom of the present invention relies on controlling the cantilever shifting mechanism and the position control test device to achieve pre-adjustment and alignment matching of cantilever cranes of different models, heights and sizes before testing. The versatility and adaptability of the entire device are relatively strong; it can complete the testing under vibration conditions for various models of cantilever cranes in the assembly workshop before leaving the factory.

[0019] 3. When testing the cantilever crane at different points, it can complete multi-point vibration status testing and vibration information collection for the first horizontal boom, the second horizontal boom and their respective hinge points of the cantilever crane, as well as multi-directional data collection and warning of risk vibration points, thus improving the overall test accuracy and reliability before delivery.

[0020] 4. The vibration test device for the mechanical parts of the crane boom relies on the first vibration catcher, the second vibration catcher, the third vibration catcher, and the fourth vibration catcher to analyze the vibration amplitudes of the first horizontal boom and the second horizontal boom in different swinging states and swinging angle states, thereby ensuring that it can collect and acquire vibration data when simulating the working swinging arm state of the cantilever crane, thereby improving the diversity of data collection and making it closer to data collection under actual operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn according to the actual scale.

[0022] Figure 1 It is a schematic diagram of the structure of the present invention in working state.

[0023] Figure 2 for Figure 1 Schematic diagram of the local three-dimensional structure.

[0024] Figure 3 for Figure 2 Schematic diagram of the top view structure.

[0025] Figure 4 It is a three-dimensional structural schematic diagram of the crane boom mechanical component vibration testing device of the present invention.

[0026] Figure 5 It is a side structural schematic diagram of a crane boom mechanical component vibration testing device of the present invention.

[0027] Figure 6 It is a schematic diagram of the top view of the structure of the vibration testing device for the mechanical parts of the crane boom of the present invention.

[0028] Figure 7 It is a partial three-dimensional structural schematic diagram of the crane boom mechanical component vibration testing device of the present invention.

[0029] Figure 8 It is a schematic diagram of the three-dimensional structure of a cantilever crane in the prior art.

[0030] Fig. 9 It is a schematic diagram of the structure of a cantilever crane in the prior art from a top view.

[0031] In the figure, 1, vibration platform; 2, cantilever crane; 201, vertical frame; 202, first horizontal boom; 203, second horizontal boom; 3, fixed platform; 4, fixed steel frame; 5, guide shaft; 6, guide shaft sleeve; 7, translation frame; 8, first vibration catcher; 9, second vibration catcher; 10, third vibration catcher; 11, fourth vibration catcher; 12, vertical lead screw; 13, lifting slide; 14, translation rack; 15, ear seat; 16, translation drive motor; 17, translation drive gear; 18, driven gear; 19, center Gear; 20. Lifting drive motor; 21. Motor frame; 22. Swing hinge shaft; 23. Telescopic cylinder; 24. Vibration analyzer; 25. Rotating motor; 26. Threaded adjustment column; 27. Constraint sleeve; 28. Main laser vibrometer; 29. ​​Auxiliary laser vibrometer; 30. Telescopic electric cylinder; 31. Elastic arc thin plate; 32. Lower eddy current displacement sensor; 33. Inner frame; 34. Fixed plate; 35. Central vertical shaft; 36. Counterweight block; 37. Rotating hand wheel; 38. Coupling; 39. Anti-slip pressure spring; 40. Strain gauge vibration sensor. DETAILED DESCRIPTION

[0032] The following is a detailed description of the embodiments of the technical solution of the present invention in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present invention. Figure 1-Figure 9 as shown in .

[0033] Embodiment 1: A vibration test device for crane boom mechanical parts, comprising an existing vibration platform 1 fixed at the bottom, the top of the vibration platform 1 is used to install a cantilever crane 2, a fixed platform 3 is arranged on the left side of the vibration platform 1, the bottom of the fixed platform 3 is fixed on the ground, a fixed steel frame 4 is arranged on the top of the fixed platform 3, a cantilever displacement mechanism is installed on the fixed steel frame 4, the left end of the cantilever displacement mechanism is connected to an external supporting telescopic device, a lifting and lowering position control device is installed on the right end of the cantilever displacement mechanism, and a position control test device is installed on the front and rear sides of the lifting and lowering position control device, respectively, and the two position control test devices are independent of each other in the working state, and the two position control test devices are respectively arranged on the front and rear sides of the cantilever crane 2 and are used to complete the multi-point vibration state test. It should be noted that: the vibration test device for crane boom mechanical parts in the present invention can complete the vibration condition test of the cantilever crane 2 under the vibration state before leaving the factory and complete the acquisition of vibration data of each key part of the cantilever crane 2 when it is used, which is convenient for subsequent analysis of vibration and motion stability.

[0034] The boom of the cantilever crane 2 to be shipped is assembled on the vibration platform 1. After the installation is completed, the cantilever crane 2 is fixed on the top of the vibration platform 1 by means of its stand 201. The left end of the first horizontal boom 202 of the cantilever crane 2 is hinged on the stand 201, and the second horizontal boom 203 is movably hinged at the right end of the first horizontal boom 202. Then, relevant lifting accessories such as lifting hooks are installed on the first horizontal boom 202 and the second horizontal boom 203. The right end of the second horizontal boom 203 is the lifting end.

[0035] After the cantilever crane 2 is installed, the total power supply of the vibration test device for the mechanical parts of the crane arm is controlled to be turned on. The vibration test device for the mechanical parts of the crane arm is adjusted according to the specific size of the current cantilever crane 2 and the current swing position, so that the cantilever shifting mechanism, the lifting position control device, and the position control test device are shifted to the appropriate position as needed. At this time, the vibration platform 1 is started to simulate different vibration conditions under actual use conditions according to different vibration frequency amplitudes. When the cantilever crane 2 is in different vibration states, the control position test device is controlled to complete the collection of vibration information data for multiple key parts of the cantilever crane 2, so as to facilitate the subsequent completion of the vibration safety analysis of the cantilever crane 2.

[0036] In any of the above schemes, it is preferred that the cantilever displacement mechanism includes two guide shafts 5 arranged in parallel and spaced apart from top to bottom, the left and right ends of each guide shaft 5 respectively move through the axial holes of the guide shaft sleeve 6 on the side wall of the fixed steel frame 4, the right end of each guide shaft 5 is fixedly connected to the lifting and controlling device, and the left end of each guide shaft 5 is connected to an external telescopic device, and the external telescopic device drives the two guide shafts 5 to move synchronously in the left and right directions through telescoping.

[0037] The cantilever shifting mechanism in the present invention relies on an external telescopic device to be able to translate and push the guide shaft 5 and the lifting and lowering control device at its right end to follow and translate to the right position, ensuring that it can be shifted to different horizontal positions according to the size of the current cantilever crane 2.

[0038] In any of the above schemes, it is preferred that the lifting and lowering control device includes a translation frame 7 installed at the right end of the cantilever shifting mechanism, and screw moving mechanisms are symmetrically arranged on the front and rear sides of the translation frame 7, respectively. The bottom of each screw moving mechanism is movably inserted into the bottom mounting hole of the translation frame 7, and the top of each screw moving mechanism is movably extended to the upper part of the translation frame 7 and connected to the multi-tooth transmission unit, and the multi-tooth transmission unit is used to drive the two screw moving mechanisms to operate synchronously, and a rack moving mechanism is respectively installed on each of the screw moving mechanisms, and the two rack moving mechanisms clamp the cantilever crane 2 in the middle, and a first vibration catcher 8, a second vibration catcher 9, a third vibration catcher 10, and a fourth vibration catcher 11 are respectively installed on the inner side wall of each rack moving mechanism facing the cantilever crane 2.

[0039] The lifting and lowering control device in the present invention relies on the rack moving mechanism on the top to drive each of the lead screw moving mechanisms to follow the operation when working, so as to realize lifting and lowering by driving the two rack moving mechanisms installed thereon. In the lifting and lowering process, the first horizontal boom 202 and the second horizontal boom 203 of the current cantilever crane 2 are matched and positioned according to their heights; when the positioning is completed, the two current rack moving mechanisms are controlled to shift independently respectively, so that the first vibration catcher 8, the second vibration catcher 9, the third vibration catcher 10, and the fourth vibration catcher 11 at the front end of each rack moving mechanism can realize preliminary adjustment and shifting as needed; subsequently, the first vibration catcher 8, the second vibration catcher 9, the third vibration catcher 10, and the fourth vibration catcher 11 are controlled to be adjusted separately according to the different positions of the current test points to achieve the purpose of fine adjustment.

[0040] In any of the above schemes, it is preferred that the screw moving mechanism includes two vertical screws 12 respectively arranged vertically in the space on the left and right sides of the translation frame 7, the stepped shafts at the upper and lower ends of the vertical screw 12 are movable through the mounting holes at the top and bottom of the translation frame 7, the top of the vertical screw 12 is connected to the multi-tooth transmission unit, and the outer side walls of the two vertical screws 12 are respectively threaded with lifting slides 13, and the rack moving mechanism is arranged between the two lifting slides 13, and the rack moving mechanism slides through the insertion holes arranged on the lifting slides 13 and extends to both sides thereof.

[0041] When the screw positioning mechanism is working, it relies on the operation of the multi-tooth transmission unit to transmit power to the four vertical screws 12 respectively and keep the four vertical screws 12 rotating synchronously. Relying on the layout of multiple vertical screws 12, it can effectively ensure the support stability of the rack positioning mechanism on the corresponding side controlled by it, and effectively ensure its positioning effect. Each rack positioning mechanism is driven by the lifting of two relatively spaced lifting slides 13 to achieve overall lifting, so that the rack positioning mechanism can be properly lifted and lowered according to the current height of the cantilever crane 2.

[0042] In any of the above schemes, it is preferred that the rack movement mechanism includes a translation rack 14, and a rack driving part is respectively installed on the inner side of the left end of each translation rack 14; the two ends of the translation rack 14 respectively moveably pass through the insertion holes corresponding to the lifting slide 13 and extend to both sides thereof, and the first vibration catcher 8 and the third vibration catcher 10 are respectively movably hingedly installed in each ear seat 15 at the inner side wall of the right end of the translation rack 14 located on the rear side, and the second vibration catcher 9 and the fourth vibration catcher 11 are respectively movably hingedly installed in each ear seat 15 at the inner side wall of the right end of the translation rack 14 located on the front side.

[0043] When the rack movement mechanism is working, the current rack drive is started. When the rack drive is working, it can drive the corresponding translation rack 14 to shift in the horizontal direction. During the shifting process, the translation rack 14 drives each vibration catcher at its right end to achieve translation as needed, thereby completing the collection of vibration test information of corresponding parts for crane booms with different cantilever lengths.

[0044] The first vibration capturer 8, the second vibration capturer 9, the third vibration capturer 10 and the fourth vibration capturer 11 can respectively complete the vibration information collection for the first horizontal boom 202, the second horizontal boom 203 and the connection parts of the cantilever crane 2, thereby effectively ensuring the completeness of the vibration test information collection.

[0045] In any of the above schemes, it is preferred that the rack drive member includes a translation drive motor 16 fixedly mounted on the top of the translation frame 7, and a translation drive gear 17 is fixedly mounted on the top of the motor shaft of the translation drive motor 16, and the translation drive gear 17 is meshed with the translation rack 14 on its corresponding side.

[0046] After the rack drive is started, the operation of the translation drive motor 16 drives the translation drive gear 17 to rotate, so that the translation rack 14 meshing with the translation drive gear 17 can be driven to achieve translation displacement along the horizontal direction by the rotation of the translation drive gear 17.

[0047] In any of the above schemes, it is preferred that the multi-tooth transmission unit includes four driven gears 18 respectively fixed on the top of the vertical screw 12, and a central gear 19 for simultaneously engaging with the four driven gears 18 is arranged in the middle of the four driven gears 18, and the top of the gear shaft of the central gear 19 is respectively connected to the motor shaft of the lifting drive motor 20, and the lifting drive motor 20 is fixed to the top of the translation frame 7 through the motor frame 21.

[0048] When the multi-tooth transmission unit is working, the lifting drive motor 20 is started, and the motor shaft of the lifting drive motor 20 drives the center gear 19 to rotate. During the rotation of the center gear 19, the center gear 19 drives the four circumferential driven gears 18 to follow the rotation. During the rotation of the driven gears 18, each vertical screw 12 can be driven to achieve synchronous rotation, thereby driving the corresponding sliding seats to rise and fall as needed, thereby achieving the purpose of driving the corresponding rack movement mechanism to achieve lifting.

[0049] In any of the above schemes, it is preferred that a top test unit is installed in the top threaded hole of the translation frame 7 above the stand 201 of the cantilever crane 2; and a lower test unit is installed on the translation frame 7 on the lower left side of the stand 201 of the cantilever crane 2.

[0050] A strain gauge vibration sensor 40 is arranged on the hinge axis of the vertical frame 201 and the first horizontal boom 202 of the cantilever crane 2, and the strain gauge vibration sensor 40 is connected to the external control unit signal; since the left end is in a fixed-axis hinged state, it does not have a large swing, so the strain gauge vibration sensor 40 is selected here for direct installation, which effectively ensures the convenience of installation and the effect of data collection.

[0051] Embodiment 2: Compared with Embodiment 1, this embodiment is different in that it also includes the following technical features:

[0052] In any of the above schemes, it is preferred that the first vibration capturer 8 and the second vibration capturer 9 are relatively arranged on the front and rear sides of the first horizontal boom 202 of the cantilever crane 2, and in the working state, they can collect the horizontal vibration swing of the first horizontal boom 202 of the cantilever crane 2 under different swing angles and upload the vibration data.

[0053] Taking into account that the first horizontal boom 202 in the entire cantilever crane 2 is in a critical load-bearing state, a first vibration capturer 8 and a second vibration capturer 9 are respectively located on both sides thereof to collect vibration information of the first horizontal boom 202 under swinging or vibrating conditions. The data collected on both sides effectively improves the test accuracy of the vibration condition of the first horizontal boom 202.

[0054] In any of the above schemes, it is preferred that the third vibration capturer 10 and the fourth vibration capturer 11 are relatively arranged on the front and rear sides of the second horizontal boom 203 of the cantilever crane 2, and in the working state, they can collect the horizontal vibration swing of the second horizontal boom 203 of the cantilever crane 2 and the vibration of the hinge part of the first horizontal boom 202 and the second horizontal boom 203 under different swing angles and upload the vibration data.

[0055] The third vibration capturer 10 and the fourth vibration capturer 11 respectively complete the acquisition of vibration data for the second horizontal boom 203 and the hinge points of the second horizontal boom 203 to ensure simultaneous testing of multiple points. The multi-point test improves the objectivity and accuracy of the test and better realizes the analysis and positioning of key weak points.

[0056] In any of the above schemes, it is preferred that the first vibration catcher 8, the second vibration catcher 9, the third vibration catcher 10, and the fourth vibration catcher 11 all adopt vibration test catchers with the same structure, and the vibration test catcher includes a vertically arranged swing hinge shaft 22, and the upper and lower ends of the swing hinge shaft 22 are respectively movably inserted on the ear seat 15 on the inner wall of the rack positioning mechanism at the corresponding positions thereof, and a vibration test unit is fixedly installed on the inner middle part of the swing hinge shaft 22, and the front end working heads of each of the vibration test units are kept perpendicular to their test surfaces.

[0057] In any of the above schemes, it is preferred that the vibration testing unit includes a telescopic cylinder 23 horizontally fixed on the middle outer wall of the swing hinge shaft 22, and a vibration analyzer 24 is fixedly installed on the inner end of the piston rod of the telescopic cylinder 23, and the working head of the vibration analyzer 24 is facing the corresponding test part of the cantilever crane 2.

[0058] When the vibration test unit is working, it controls the extension and retraction of the corresponding telescopic cylinder 23 to drive the existing vibration analyzer 24 at its front end toward the current test point, thereby accurately obtaining data related to the vibration conditions of the corresponding test parts of the cantilever crane 2 under the simulated vibration conditions, and monitoring the safety thresholds of various indicators, and issuing an alarm when the safety thresholds are exceeded.

[0059] In any of the above schemes, it is preferred that the bottom of each swing hinge shaft 22 is movable and extends out to the bottom of the ear seat 15 at its corresponding position, and a rotating motor 25 is fixedly installed at the bottom of each ear seat 15, and the motor shaft of each rotating motor 25 is used to drive the corresponding swing hinge shaft 22 and the vibration test unit above it to achieve fixed-axis swing, and the angle between the vibration test unit and the point to be tested on the cantilever crane 2 is changed through the fixed-axis swing of the vibration test unit.

[0060] In order to ensure that each vibration analyzer 24 faces the tested part at different relative angles in the working state, different test effects can be achieved according to different test angles, thereby facilitating multi-directional data collection and subsequent analysis.

[0061] Embodiment 3: Compared with Embodiment 2, this embodiment is different in that it also includes the following technical features:

[0062] In any of the above schemes, it is preferred that the top test unit includes a threaded adjustment column 26 screwed into a threaded hole at the top of the translation frame 7, an external thread is provided on the outer wall of the threaded adjustment column 26, the bottom of the threaded adjustment column 26 extends to the space above the stand 201 of the cantilever crane 2, a constraint sleeve 27 is fixedly installed at the bottom of the threaded adjustment column 26, a main laser vibrometer 28 is vertically installed at the top of the inner cavity of the constraint sleeve 27, and auxiliary laser vibrometers 29 are horizontally installed on both sides of the upper outer wall of the stand 201 of the cantilever crane 2, and the outer ends of the auxiliary laser vibrometers 29 are fixed on the inner wall of the constraint sleeve 27.

[0063] A rotating hand wheel 37 is fixedly installed on the top of the threaded adjustment column 26 through a coupling 38, and an anti-slip pressure spring 39 is sleeved on the outer wall of the threaded adjustment column 26 between the coupling 38 and the top of the translation frame 7, and the top of the anti-slip pressure spring 39 abuts against the bottom of the coupling, and the bottom of the anti-slip pressure spring 39 abuts against the top of the translation frame 7.

[0064] The anti-slipping pressing spring 39 presses the threaded adjusting column 26 through the up and down tensioning force, thereby preventing rotation and slipping.

[0065] When using the top test unit, the vibration condition of the top of the frame 201 of the current cantilever crane 2 is tested by relying on the main laser vibrometer 28 and the auxiliary laser vibrometers 29 on both sides. Considering that the bottom of the frame 201 of the cantilever crane 2 is fixed and its top is at the highest position, its vibration amplitude is the largest and it is also the most dangerous part of the frame 201. Therefore, the main laser vibrometer 28 vertically located in the center of the top is used in conjunction with the auxiliary laser vibrometers 29 on both sides to realize multi-directional vibration information collection and testing, thereby improving the accuracy of the test.

[0066] In any of the above schemes, it is preferred that the lower test unit includes a telescopic electric cylinder 30 horizontally installed on the left side of the vertical plate of the translation frame 7, the right end of the piston rod of the telescopic electric cylinder 30 is movably extended into the space between the vertical frame 201 and the vertical plate, and an elastic arc-shaped thin plate 31 is fixedly installed on the right end of the piston rod of the telescopic electric cylinder 30, and a plurality of lower eddy current displacement sensors 32 are arranged at intervals along the circumferential direction of the side wall of the elastic arc-shaped thin plate 31 facing the vertical frame 201, and at least one of the lower eddy current displacement sensors 32 is used to detect the vibration state of the side wall of the vertical frame 201 when in working state.

[0067] The lower test unit is designed with multiple lower eddy current displacement sensors 32 which are respectively placed on the left side of the stand 201 and close to it, which can effectively ensure the collection of vibration test information at the bottom of the stand 201. Multiple lower eddy current displacement sensors 32 can ensure the accuracy of the test and mutual calibration.

[0068] In any of the above schemes, it is preferred that a counterweight is installed at the bottom of the inner frame 33 of the fixed steel frame 4, and the counterweight includes a fixed plate 34 fixedly installed at the bottom of the inner frame 33, a central vertical shaft 35 is fixedly installed at the top center of the fixed plate 34, and a plurality of counterweight blocks 36 are movably sleeved and stacked on the outer side wall of the central vertical shaft 35.

[0069] When the entire device is adjusted in translation, the stability of the entire structure is taken into consideration, so a counterweight is provided to pressurize and fix the fixed steel frame 4, thereby effectively ensuring the stability of the entire structure. Different counterweight stabilization effects can be achieved by controlling the addition of different numbers of counterweight blocks 36.

[0070] Specific working principle: The crane boom mechanical parts vibration testing device in this design can complete the vibration test of the cantilever crane 2 under the vibration state before leaving the factory and obtain the vibration data of each key part of the cantilever crane 2 when in use, so as to facilitate the subsequent analysis of vibration and motion stability; the boom of the cantilever crane 2 to be shipped out of the factory is assembled on the vibration platform 1, and after the installation is completed, the cantilever crane 2 is fixed on the top of the vibration platform 1 by its stand 201.

[0071] After installation, the left end of the first horizontal boom 202 of the cantilever crane 2 is hinged on the vertical frame 201, and the second horizontal boom 203 is movably hinged on the right end of the first horizontal boom 202, and then relevant lifting accessories such as lifting hooks are installed on the first horizontal boom 202 and the second horizontal boom 203, and the right end of the second horizontal boom 203 is the lifting end; after the cantilever crane 2 is installed, the total power supply of the vibration test device for the mechanical parts of the crane boom is controlled to be turned on.

[0072] According to the specific size and the current swing position of the current cantilever crane 2, the vibration test device of the crane boom mechanical parts is adjusted so that the cantilever shifting mechanism, the lifting control device and the control test device are shifted to the appropriate position as needed.

[0073] At this time, the vibration platform 1 is started so that it can simulate different vibration conditions under actual use conditions according to different vibration frequency amplitudes.

[0074] When the cantilever crane 2 is in different vibration states, the control position test device is controlled to complete the collection of vibration information data of multiple key parts of the cantilever crane 2, so as to complete the vibration safety analysis of the cantilever crane 2 later.

[0075] Relying on the first vibration catcher 8, the second vibration catcher 9, the third vibration catcher 10, the fourth vibration catcher 11 and the strain gauge vibration sensors at the top test unit, the lower test unit and the hinged part of the first horizontal boom 202, the vibration test information of multiple points in the vibration state or the vibration and swinging state is collected, which effectively improves the vibration analysis of all points of the cantilever crane 2 in the vibration state and improves the rapid test of the vibration safety of the cantilever crane 2 before leaving the factory.

[0076] From the above, it can be seen that the vibration test device for the mechanical parts of the crane boom can be installed inside the workshop to test the vibration state of the cantilever crane 2 under different vibration simulation conditions and obtain the vibration frequency and amplitude, effectively monitor whether the different vibration points of the current cantilever crane 2 exceed the safety threshold and issue an alarm after timely uploading, thereby improving the safety of the cantilever crane 2 when dealing with complex and multiple vibration conditions after leaving the factory; when the device is in use, it relies on controlling the cantilever shifting mechanism and the position control test device to complete the pre-test pre-adjustment and alignment matching of cantilever cranes 2 of different models, heights and sizes, and the whole device has strong versatility and adaptability; it can complete the pre-factory testing of various models of cantilever cranes 2 in the assembly workshop under vibration conditions.

[0077] When testing the cantilever crane 2 at different points, it is possible to complete multi-point vibration state testing and vibration information collection of the first horizontal boom 202, the second horizontal boom 203 and their respective hinge points of the cantilever crane 2, multi-directional data collection and warning of risk vibration points, thereby improving the overall test accuracy and reliability before delivery; the device relies on the first vibration capturer 8, the second vibration capturer 9, the third vibration capturer 10, and the fourth vibration capturer 11 to analyze the vibration amplitude of the first horizontal boom 202 and the second horizontal boom 203 in different swing states and swing angle states, thereby ensuring that it can collect and obtain vibration data when simulating the working swing arm state of the cantilever crane 2, thereby improving the diversity of data collection and making it closer to data collection under actual operating conditions.

[0078] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. For those skilled in the art, any replacement improvements or changes made to the implementation methods of the present invention fall within the protection scope of the present invention.

[0079] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A vibration test device for crane boom mechanical parts, characterized in that: It comprises a vibration platform fixedly arranged at the bottom, the top of the vibration platform is used to install a cantilever crane, a fixed platform is arranged on the left side of the vibration platform, the bottom of the fixed platform is fixed on the ground, a fixed steel frame is arranged on the top of the fixed platform, a cantilever displacement mechanism is installed on the fixed steel frame, the left end of the cantilever displacement mechanism is connected with an external supporting telescopic device, a lifting and lowering position control device is installed at the right end of the cantilever displacement mechanism, and position control test devices are respectively installed on the front and rear sides of the lifting and lowering position control device, the two position control test devices are independent of each other in the working state, and the two position control test devices are respectively arranged on the front and rear sides of the cantilever crane and are used to complete the multi-point vibration state test of the cantilever crane; The vibration platform simulates different vibration conditions in actual use according to different vibration frequency amplitudes; The lifting and lowering control device comprises a translation frame, and screw movement mechanisms are symmetrically arranged on the front and rear sides of the translation frame; the screw movement mechanism comprises a vertical screw, the top of which is connected to a multi-tooth transmission unit, and lifting slides are respectively threadedly sleeved on the outer side walls of the two vertical screws, and a rack movement mechanism is arranged between the two lifting slides; the rack movement mechanism comprises a translation rack, and a first vibration catcher and a third vibration catcher are respectively hinged in each ear seat at the inner side wall of the right end of the translation rack on the rear side, and a second vibration catcher and a fourth vibration catcher are respectively hinged in each ear seat at the inner side wall of the right end of the translation rack on the front side; The first vibration capturer and the second vibration capturer collect the horizontal vibration swing of the first horizontal boom at different swing angles and upload the vibration data; The third vibration capturer and the fourth vibration capturer respectively complete vibration data acquisition and multi-point simultaneous testing of the horizontal vibration swing of the second horizontal boom and its hinge points at different swing angles; The first vibration capturer, the second vibration capturer, the third vibration capturer and the fourth vibration capturer can analyze the vibration amplitude of the first horizontal boom and the second horizontal boom in different swinging states and swinging angles, and can collect and acquire vibration data in the simulated working swing arm state, collecting data close to actual working conditions.

2. A crane boom mechanical component vibration test device according to claim 1, characterized in that: The cantilever displacement mechanism includes two guide shafts arranged in parallel and spaced apart from top to bottom, the left and right ends of each guide shaft respectively move through the axial holes of the guide shaft sleeve on the side wall of the fixed steel frame, the right end of each guide shaft is fixedly connected to the lifting and lowering control device, and the left end of each guide shaft is connected to an external telescopic device, and the external telescopic device drives the two guide shafts to move synchronously in the left and right directions through telescoping.

3. A crane boom mechanical component vibration test device according to claim 2, characterized in that: The lifting and lowering control device includes a translation frame installed at the right end of the cantilever shifting mechanism, the bottom of each of the lead screw moving mechanisms is movably inserted into the bottom mounting hole of the translation frame, the top of each of the lead screw moving mechanisms is movably extended to the upper part of the translation frame and is connected to a multi-tooth transmission unit, the multi-tooth transmission unit is used to drive the two lead screw moving mechanisms to operate synchronously, a rack moving mechanism is respectively installed on each of the lead screw moving mechanisms, the two rack moving mechanisms clamp the cantilever crane in the middle, and a first vibration catcher, a second vibration catcher, a third vibration catcher, and a fourth vibration catcher are respectively installed on the inner side wall of each of the rack moving mechanisms facing the cantilever crane.

4. A crane boom mechanical component vibration test device according to claim 3, characterized in that: The screw moving mechanism includes two vertical screws respectively arranged vertically in the spaces on the left and right sides of the translation frame. The stepped shafts at the upper and lower ends of the vertical screws are movable through the mounting holes at the top and bottom of the translation frame. The rack moving mechanism slides through the insertion holes set on the lifting slide and extends to both sides thereof.

5. A crane boom mechanical component vibration test device according to claim 4, characterized in that: A rack driving member is respectively installed on the inner side of the left end of each translation rack; the two ends of the translation rack are respectively movable through the corresponding insertion holes of the lifting slide and extend to both sides thereof.

6. A crane boom mechanical component vibration test device according to claim 5, characterized in that: The rack drive member includes a translation drive motor fixedly mounted on the top of the translation frame, a translation drive gear fixedly mounted on the top of the motor shaft of the translation drive motor, and the translation drive gear meshes with the translation rack on its corresponding side.

7. A crane boom mechanical component vibration test device according to claim 6, characterized in that: The multi-tooth transmission unit includes four driven gears respectively fixed on the top of the vertical screw, and a central gear for simultaneously engaging with the four driven gears is arranged in the middle of the four driven gears. The top of the gear shaft of the central gear is respectively connected to the motor shaft of the lifting drive motor, and the lifting drive motor is fixed to the top of the translation frame through a motor frame.

8. A crane boom mechanical component vibration test device according to claim 7, characterized in that: A top test unit is installed in the top threaded hole of the translation frame above the stand of the cantilever crane; and a lower test unit is installed on the translation frame on the lower left side of the stand of the cantilever crane.

9. A crane boom mechanical component vibration test device according to claim 8, characterized in that: A counterweight is installed at the bottom of the inner frame of the fixed steel frame. The counterweight includes a fixed plate fixedly installed at the bottom of the inner frame, a central vertical shaft is fixedly installed at the top center of the fixed plate, and a plurality of counterweight blocks are movably sleeved and stacked on the outer side wall of the central vertical shaft.

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