Impact testing device for crane jib component

Abstract

The invention relates to the technical field of crane jib mechanical part testing, in particular to a crane jib part impact testing device which comprises a lifting mechanism, a rigid frame is fixedly installed on the top of the lifting mechanism, and an installation frame is fixedly installed on the left end working face of the rigid frame in a bolted mode. A cantilever translation mechanism is mounted on the rigid frame, a suspension arm multidirectional impact unit is mounted at the left end of the cantilever translation mechanism, and the suspension arm multidirectional impact unit is used for completing an impact test on a to-be-tested suspension arm unit of the cantilever crane; and a linkage mechanism for driving the cantilever translation mechanism is mounted in the rigid frame. According to the impact test device for the crane jib component, the vibration test of the far end and the root of the jib can be realized during the jib test, the stability and the safety of the jib in the impact state are effectively ensured, the safety test of the cantilever crane jib before delivery is ensured, and the test result is more reliable.

Description

Technical Field

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

[0002] The crane boom is a key component of a crane, which mainly plays the role of realizing the lifting of goods in the vertical and horizontal directions, lifting goods across obstacles, or assisting in accurately positioning goods. During actual use, the crane boom may be subjected to various accidental impacts, such as sudden swinging of the lifted goods, collision with external objects during the operation of the crane, and anti-impact stability of the crane boom used at sea under the action of wind load.

[0003] Therefore, it is necessary to conduct impact testing on the crane boom before leaving the factory to ensure its overall strength; specifically, through impact testing, it can be checked whether the structure of the boom can withstand these sudden impact forces, ensuring that it will not break or deform excessively after being impacted.

[0004] After retrieval, a boom bearing force detection device for crane detection is disclosed in the patent with the patent application number CN202310774942.4, which mainly includes structural components such as a wall beam, a crane main body, a hook mechanism, a measuring mechanism, a protection mechanism, a testing mechanism, a shock absorption mechanism, and a transportation mechanism.

[0005] It can be seen from the records of the prior art that the existing boom bearing force detection device mainly measures by setting a measuring mechanism, fixing the center plate at the middle of the bottom of the main beam, using the measuring scale to stretch to make the level measure, and then lowering the measuring scale to the same length again after loading for measurement. The data obtained by comparing the two results is used to calculate the downward deflection of the main beam, which plays an important reference role in the load-bearing test of the device. However, the above boom bearing force detection device has the following problems in actual use: First, in actual testing, the crane boom not only needs static testing but also needs to complete dynamic testing, while the above boom bearing force detection device cannot effectively complete multi-dynamic condition simulation testing; Second, during the boom impact testing process, it is impossible to complete the testing of the boom stability, and the testing conditions are single, which has a greater impact on the effect of real impact testing and cannot objectively reflect the true anti-impact performance of the boom components.

[0006] Based on this, the present invention optimizes the design of the anti-impact testing device for boom mechanical components before leaving the factory in the prior art, and proposes a new impact testing device for crane boom components to better solve the problems existing in the prior art. Summary of the Invention

[0007] To solve one of the above technical problems, the technical solution adopted by the present invention is: a shock test device for a crane boom component, including a lifting mechanism. At the top of the lifting mechanism, a rigid frame is fixedly installed. On the working surface at the left end of the rigid frame, a mounting frame is bolted and fixedly installed. The left end of the mounting frame is used to install a jib crane boom unit. On the rigid frame, a jib translation mechanism is installed. At the left end of the jib translation mechanism, a boom multi-directional impact unit is installed. The boom multi-directional impact unit is used to complete a shock test on the jib crane boom unit to be tested. Inside the rigid frame, a linkage mechanism is installed for driving the jib translation mechanism.

[0008] In any of the above solutions, preferably, the lifting mechanism includes a plurality of vertically arranged lifting cylinders. The top of each lifting cylinder is fixed to the bottom of the rigid frame, and the bottom of each lifting cylinder is fixed to the top of a fixed seat. The fixed seat is fixedly connected to the ground. When each lifting cylinder is working, they are all in a synchronous lifting state.

[0009] In any of the above solutions, preferably, a vertical track hole is provided in the middle of the left side wall of the rigid frame. Inside the vertical track hole, a root impact unit is installed. The left end of the root impact unit faces the root of the jib crane boom unit to be tested and is used to perform a shock test on it.

[0010] In any of the above solutions, preferably, open holes for the root impact unit to pass through are provided on the side walls on both the left and right sides of the mounting frame.

[0011] In any of the above solutions, preferably, the upper and lower ends of the right end vertical shaft of the jib crane boom unit are movably inserted into corresponding rigid shaft seats. Each rigid shaft seat is fixedly installed on the side wall of the mounting frame at the upper and lower parts of the left open hole. The right end vertical shaft is welded and fixedly connected to the cantilever boom. At the front end of the cantilever boom, a hoisting hook assembly is installed. On the upper part of the cantilever boom, a steel suspension rod is provided. The left end of the steel suspension rod is connected to the top of the left end of the cantilever boom, and the right end of the steel suspension rod is fixedly connected to the outer side wall of the upper part of the right end vertical shaft.

[0012] Preferably, in any of the above solutions, the cantilever translation mechanism includes upper and lower steel square tubes horizontally arranged at the top and bottom of the rigid frame. At the bottom of the rigid frame corresponding to the upper steel square tube, two spaced upper main square sleeves are welded, and the upper main square sleeves are sleeved on the outer side wall of the upper steel square tube. At the top of the rigid frame corresponding to the lower steel square tube, two spaced lower main square sleeves are welded, and the lower main square sleeves are sleeved on the outer side wall of the lower steel square tube. On the opposite side walls of the upper steel square tube and the lower steel square tube, a number of tooth groove holes are respectively arranged in an array along their lengths, and each tooth groove hole is respectively used to mesh with the linkage mechanism. A counterweight mechanism is installed at the right ends of the upper steel square tube and the lower steel square tube, and the boom multi-directional impact unit is installed at the left ends of the upper steel square tube and the lower steel square tube.

[0013] Preferably, in any of the above solutions, an upper auxiliary square sleeve and a lower auxiliary square sleeve are respectively fixed at the top and bottom of the mounting frame, and the upper auxiliary square sleeve and the lower auxiliary square sleeve are respectively sleeved on the outer side wall of the upper steel square tube and the outer side wall of the lower steel square tube.

[0014] Preferably, in any of the above solutions, the boom multi-directional impact unit is used to perform a follow-up impact vibration test on the boom of the cantilever crane in the longitudinal and circumferential directions.

[0015] Preferably, in any of the above solutions, the boom multi-directional impact unit includes a number of upper impact cylinders fixedly installed at intervals at the bottom of the left end of the upper steel square tube. The bottom of the piston rod of each upper impact cylinder faces the top of the boom of the cantilever crane and performs a downward impact test on it during operation. It also includes a number of lower impact cylinders fixedly installed at intervals at the top of the left end of the lower steel square tube. The top of the piston rod of each lower impact cylinder faces the bottom of the boom of the cantilever crane and performs an upward impact test on it during operation.

[0016] Preferably, in any of the above solutions, the bottom of the piston rod of each upper impact cylinder can be used to perform a downward impact on the top left end of the boom of the cantilever crane or perform a reciprocating vibration impact on different positions at the top of the steel suspension rod. Through the reciprocating up and down movement of the upper impact cylinder, the vibration impact on the steel suspension rod is realized to simulate the wind load impact under offshore conditions.

[0017] Preferably, in any of the above solutions, a first piezoelectric impact sensor is installed on the piston rod of each lower impact cylinder and each upper impact cylinder, and the first piezoelectric impact sensor is used to collect impact information and transmit its impact signal outward.

[0018] Preferably, in any of the above solutions, a follow-up impact measurement mechanism is fixedly installed at the left end of the upper steel square tube and the lower steel square tube. The follow-up impact measurement mechanism is composed of two impact measurement components symmetrically arranged on both sides of the boom of the cantilever crane. When working, the two impact measurement components operate independently and control the boom of the cantilever crane to achieve lateral swing positioning.

[0019] Preferably, in any of the above solutions, the impact measurement component includes a C-shaped frame fixedly installed on one side of the boom of the cantilever crane. The inner ends of the two horizontal sections of the C-shaped frame are respectively fixedly installed on the corresponding side walls at the left end of the upper steel square tube and the lower steel square tube. An installation cavity is provided in the middle of the vertical section of the C-shaped frame. A high-strength lead screw is vertically installed in the installation cavity. The upper and lower ends of the high-strength lead screw both pass through the installation cavity to the outside through stepped shafts. The top of the high-strength lead screw is connected to a position control motor fixedly installed on the top of the C-shaped frame. A lifting slide is sleeved on the outer side wall of the high-strength lead screw. The inner end of the lifting slide passes through the through hole on the inner side of the installation cavity and faces the side of the boom of the cantilever crane. A side impact cylinder is fixedly installed on the inner end surface of the lifting slide. The piston rod of the side impact cylinder is used to impact the side wall corresponding to the left end of the boom of the cantilever crane.

[0020] Preferably, in any of the above solutions, a strong magnetic electromagnet is fixedly installed at the end of the piston rod of the side impact cylinder, and a second piezoelectric impact sensor is fixedly installed at the end of the strong magnetic electromagnet. The second piezoelectric impact sensor is used to collect impact information and transmit its impact signal outward.

[0021] Preferably, when the strong magnetic electromagnet is not energized, it has no magnetic force. The strong magnetic electromagnet follows the expansion and contraction of the piston rod of the side impact cylinder and acts as an impact head to impact the side wall corresponding to the left end of the boom of the cantilever crane to realize its forward swing around the right end vertical axis; when the strong magnetic electromagnet is energized, it has strong magnetic force. Through magnetic attraction with the side wall corresponding to the left end of the boom of the cantilever crane, the expansion and contraction of the piston rod of the side impact cylinder drives the side wall corresponding to the left end of the boom of the cantilever crane to realize its reverse swing around the right end vertical axis. This process is repeated to achieve the wind swing anti-vibration safety test of the boom of the cantilever crane under the simulated sea strong wind condition.

[0022] Preferably, in any of the above solutions, the linkage mechanism includes a central through cavity provided at the central position of the top or bottom of the rigid frame. A driving gear is installed inside the central through cavity and is used to mesh with each of the tooth groove holes. Both the front and rear ends of the gear shaft of the driving gear extend out of the rigid frame movably. A linkage pulley fixedly connected to the gear shaft is fixedly installed on the front end face of the rigid frame. A displacement control motor is fixedly installed on the front end face in the middle of the right side of the rigid frame. A driving pulley is fixedly installed on the motor shaft of the displacement control motor. A toothed belt is wound around the driving pulley and the two linkage pulleys.

[0023] Preferably, in any of the above solutions, the counterweight mechanism includes a counterweight fixing frame fixedly installed at the right ends of the upper steel square pipe and the lower steel square pipe. A central counterweight shaft is fixedly installed in the middle of the bottom surface of the counterweight space of the counterweight fixing frame. A plurality of counterweight disks are stacked on the outer side wall of the central counterweight shaft at intervals from top to bottom in sequence.

[0024] Preferably, in any of the above solutions, the root impact unit includes a swing position steel pipe horizontally passing through the vertical track hole. Central swing shafts are respectively fixed on the front and rear sides in the middle of the swing position steel pipe. The end parts of the two central swing shafts are respectively inserted and fitted into the pipe holes on the corresponding side walls of the moving swing seats at their corresponding positions. Each of the moving swing seats is slidably sleeved on the outside of the rigid frame on both sides of the vertical track hole. A swing impact electric cylinder is fixedly installed inside the swing position steel pipe. An end swing impact disk is fixedly installed at the left end of the piston rod of the swing impact electric cylinder. The end swing impact disk is used to complete impact tests on different parts of the right end vertical shaft. A connecting part is horizontally formed at the bottom of each of the moving swing seats. A height control cylinder is fixedly installed on the bottom surface of the inner frame of the rigid frame below each of the connecting parts. The top of the piston rod of each height control cylinder is fixed to the bottom of the connecting part.

[0025] Preferably, in any of the above solutions, hoists are symmetrically installed at the upper and lower parts of the installation cavity of the installation frame on the left side of the swing position steel pipe. The outer ends of the steel wire ropes wound on each hoist are respectively connected to the fixed lugs at the corresponding positions at the left end of the swing position steel pipe. The two hoists cooperate to wind and unwind the ropes to control the swing angle of the central swing shaft of the swing position steel pipe around the pipe hole.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. When the crane boom component impact test device in the present invention conducts boom tests, it can achieve vibration tests on the distal end and root of the boom, effectively ensuring effective tests on the stability and safety of the boom under impact conditions, guaranteeing the safety test of the cantilever crane boom before leaving the factory, and making the test results more reliable.

[0027] 2. When the crane boom component impact test device in the present invention finishes testing the boom, it can simulate different impact conditions by controlling the impact test force on different parts of the boom, and obtain the differences in the usage of the current boom under different impact load conditions through multi-level impact force tests, effectively evaluating the impact resistance performance of the current boom to be delivered based on the test results.

[0028] 3. Considering the different usage conditions of the cantilever boom and the requirements for impact resistance and wind load resistance (the influence of wind load in offshore usage conditions and strong wind environments) during use, the present invention sets the safety and stability under the simulated wind load impact state, effectively realizing the flexible simulation of multi-level wind load conditions according to actual test requirements, and better improving the diversity of the test simulation environment.

[0029] 4. In the present invention, a counterweight mechanism is added at the tail end during the entire impact test process to ensure different counterweight requirements during multiple impact tests, and to ensure the stability of the entire device during the test.

[0030] 5. The whole of the present invention relies on the lifting mechanism at the bottom to realize the overall lifting, and can control the height of the entire device according to the installation needs of the current crane boom during the test simulation, effectively ensuring that the entire structure can be lifted as required.

[0031] 6. When the present invention conducts a boom impact test on the crane boom, it adopts a combination of upper impact and lower impact, effectively realizing the test of the strength and stability of the current boom under different impact conditions; at the same time, relying on the linkage mechanism to control the displacement of the cantilever translation mechanism can achieve impact tests on different length parts of the boom, effectively realizing the impact resistance effect of different cantilever length parts of the boom.

[0032] 7. When conducting the impact test on the entire boom, relying on the root impact unit can better test the stability of the key root connection part of the boom, ensuring the test verification of its anti-impact stability under multiple load conditions, and ensuring the reliability of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or 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 to actual scale.

[0034] Figure 1 This is the front view structural schematic diagram of the impact test device for the crane boom component of the present invention in the working state.

[0035] Figure 2 This is the three-dimensional structural schematic diagram of the impact test device for the crane boom component of the present invention in the working state.

[0036] Figure 3 This is the three-dimensional structural schematic diagram of the impact test device for the crane boom component of the present invention.

[0037] Figure 4 This is the three-dimensional structural schematic diagram of the rigid frame and the components thereon of the present invention.

[0038] Figure 5 This is the partial structural schematic diagram of the root impact unit of the present invention.

[0039] Figure 6 This is the partial front view structural schematic diagram of the impact test device for the crane boom component of the present invention.

[0040] Figure 7 For Figure 6 The three-dimensional structural schematic diagram of.

[0041] Figure 8 This is the structural schematic diagram of the jib crane boom unit to be tested.

[0042] In the figure, 1 is a rigid frame; 101 is a vertical track hole; 2 is a mounting bracket; 201 is an open hole; 3 is a jib crane boom unit; 301 is a right-end vertical shaft; 302 is a rigid shaft seat; 303 is a cantilever boom; 304 is a total assembly of a lifting hook; 305 is a steel lifting rod; 4 is a lifting cylinder; 5 is a fixed seat; 6 is an upper steel square pipe; 7 is a lower steel square pipe; 8 is an upper main square sleeve; 9 is a lower main square sleeve; 10 is a tooth groove hole; 11 is a central through cavity; 12 is a driving gear; 13 is a gear shaft; 14 is a linkage pulley; 15 is a shift control motor; 16 is a driving pulley; 17 is a toothed belt; 18 is a counterweight fixing bracket; 19 is a central counterweight shaft; 20 is a counterweight disc; 21 is an upper auxiliary square sleeve; 22 is a lower auxiliary square sleeve; 23 is an upper impact cylinder; 24 is a lower impact cylinder; 25 is a first piezoelectric impact sensor; 26 is a C-shaped frame; 27 is a mounting inner cavity; 28 is a high-strength lead screw; 29 is a position control motor; 30 is a lifting slide; 31 is a through port; 32 is a side impact cylinder; 33 is a strong magnetic electromagnet; 34 is a second piezoelectric impact sensor; 35 is a swing position steel pipe; 36 is a central swing shaft; 37 is a moving swing position seat; 3701 is a connecting part; 38 is a swing impact electric cylinder; 39 is an end swing impact disc; 40 is a height control cylinder; 41 is a winch; 42 is a steel wire rope; 43 is a fixed ear seat. Detailed implementation mode

[0043] The embodiments of the technical solution of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, so they are only examples and cannot be used to limit the protection scope of the present invention. The specific structure of the present invention is as Figures 1-8 shown in.

[0044] Embodiment 1: An impact test device for a crane boom component, including a lifting mechanism. A rigid frame 1 is fixedly installed at the top of the lifting mechanism. An installation bracket 2 is bolted and fixedly installed on the left-end working surface of the rigid frame 1. The left end of the installation bracket 2 is used to install a jib crane boom unit 3. A jib translation mechanism is installed on the rigid frame 1. A boom multi-directional impact unit is installed at the left end of the jib translation mechanism. The boom multi-directional impact unit is used to complete an impact test on the jib crane boom unit 3 to be tested. A linkage mechanism for driving the jib translation mechanism is installed in the rigid frame 1.

[0045] The entire device of the present invention is installed at the end of a crane boom assembly workshop, used for fixedly installing the assembled boom unit and successively performing multiple impact tests on the installed boom according to usage requirements and national standards and other requirements.

[0046] When conducting the impact test, control the linkage mechanism to drive the cantilever translation mechanism to move horizontally. During the movement, the displacement position of the cantilever translation mechanism can be selected according to the installation position and size of the boom unit 3 of the overhead crane to be tested currently. After the cantilever translation mechanism moves to the appropriate position, control the corresponding upper impact cylinder 23 and lower impact cylinder 24 of the boom multi-directional impact unit to conduct the impact test, and control the telescopic speed and strength of the upper impact cylinder 23 and lower impact cylinder 24 during the impact, so as to achieve different impact effects.

[0047] When conducting impact tests on each test point of the boom unit 3 of the overhead crane, conduct multiple impact tests. During the test, control the impact strength and observe and record the stability and vibration state of the boom after each impact strength.

[0048] Preferably, in any of the above solutions, the lifting mechanism includes a plurality of vertically arranged lifting cylinders 4. The tops of the lifting cylinders 4 are all fixed to the bottom of the rigid frame 1, and the bottoms of the lifting cylinders 4 are all fixed to the top of the fixed seat 5. The fixed seat 5 is fixedly connected to the ground, and the lifting cylinders 4 are in a synchronous lifting state during operation.

[0049] Controlling the synchronous lifting of each lifting cylinder 4 of the lifting mechanism can drive the corresponding lifting cylinders 4 to control the entire rigid frame 1 and the components thereon to follow the lifting during the lifting process, so as to achieve the purpose of matching and adjusting the initial installation height position to match the boom of different sizes and models of cranes currently.

[0050] Preferably, in any of the above solutions, a vertical track hole 101 is provided in the middle of the left side wall of the rigid frame 1. A root impact unit is installed inside the vertical track hole 101. The left end of the root impact unit faces the root of the boom unit 3 of the overhead crane to be tested and is used to conduct impact tests on it.

[0051] The root impact unit designed in the present invention can conduct impact tests on the key connection parts at the right end of the boom, ensuring that the impact resistance of the key load-bearing parts can be tested before leaving the factory.

[0052] Preferably, in any of the above solutions, open holes 201 for the root impact unit to pass through are provided on the side walls on the left and right sides of the mounting frame 2.

[0053] Preferably, in any of the above solutions, the upper and lower ends of the vertical shaft 301 at the right end of the boom unit 3 of the jib crane are movably inserted into the corresponding rigid shaft seats 302. Each of the rigid shaft seats 302 is fixedly installed on the side walls of the mounting frame 2 at the upper and lower parts of the open hole 201 on the left side. The right-end vertical shaft 301 is fixedly connected to the cantilever boom 303 by welding. A hoisting hook assembly 304 is installed at the front end of the cantilever boom 303. A steel suspension rod 305 is arranged on the upper part of the cantilever boom 303. The left end of the steel suspension rod 305 is connected to the top of the left end of the cantilever boom 303, and the right end of the steel suspension rod 305 is fixedly connected to the outer side wall of the upper part of the right-end vertical shaft 301.

[0054] The structure of the boom unit 3 of the jib crane belongs to the existing boom structure. Among them, when the boom unit 3 of the jib crane is installed, the overall root positioning is mainly completed by relying on the right-end vertical shaft 301 to ensure the stability of the entire boom in the cantilever state; in addition, in order to ensure the strength of the boom in the cantilever state, the added steel suspension rod 305 plays an auxiliary strengthening role.

[0055] Preferably, in any of the above solutions, the cantilever translation mechanism includes upper steel square tubes 6 and lower steel square tubes 7 horizontally arranged at the top and bottom of the rigid frame 1. Two spaced upper main square sleeves 8 are welded to the bottom of the rigid frame 1 corresponding to the upper steel square tube 6. The upper main square sleeves 8 are sleeved on the outer side wall of the upper steel square tube 6. Two spaced lower main square sleeves 9 are welded to the top of the rigid frame 1 corresponding to the lower steel square tube 7. The lower main square sleeves 9 are sleeved on the outer side wall of the lower steel square tube 7. A number of tooth groove holes 10 are respectively arranged in an array along the length direction on the opposite side walls of the upper steel square tube 6 and the lower steel square tube 7. Each of the tooth groove holes 10 is used to mesh with the linkage mechanism. A counterweight mechanism is installed at the right ends of the upper steel square tube 6 and the lower steel square tube 7, and the boom multi-directional impact unit is installed at the left ends of the upper steel square tube 6 and the lower steel square tube 7.

[0056] When the cantilever translation mechanism works, it relies on the linkage mechanism to provide driving force. When the linkage mechanism acts, the transmission force is transmitted to the corresponding tooth groove holes 10 of the upper steel square tube 6 and the lower steel square tube 7, realizing the horizontal translation of the upper steel square tube 6 and the lower steel square tube 7 with the gear rotating to drive the rack structure along the left and right directions. During the translation process, the upper main square sleeves 8 and the lower main square sleeves 9 play a constraining role to ensure the stability of the horizontal translation of the upper steel square tube 6 and the lower steel square tube 7.

[0057] During the translation of the upper steel square tube 6 and the lower steel square tube 7, the jib multi-directional impact unit at their ends can be driven to shift along the length direction of the jib as required, so that after moving to a suitable position, the locking can be realized by locking through the linkage mechanism, ensuring the locking effect.

[0058] Preferably, in any of the above solutions, the linkage mechanism includes a central through cavity 11 provided at the central position of the top or bottom of the rigid frame 1. A driving gear 12 is installed inside the central through cavity 11. The driving gear 12 is used to mesh with each of the tooth groove holes 10. Both the front and rear ends of the gear shaft 13 of the driving gear 12 are movably passed out of the rigid frame 1. A linkage pulley 14 fixedly connected to the gear shaft 13 is fixedly installed on the front end face of the rigid frame 1. The two linkage pulleys 14 are synchronous pulleys and maintain the same rotation speed. A displacement control motor 15 is fixedly installed on the front end face of the middle part on the right side of the rigid frame 1. A driving pulley 16 is fixedly installed on the motor shaft of the displacement control motor 15. A toothed belt 17 is wound around the driving pulley 16 and the two linkage pulleys 14.

[0059] When the linkage mechanism in the present invention is working, the operation of the displacement control motor 15 with large torque drives the toothed driving pulley 16 to operate. When the driving pulley 16 is operating, the toothed belt 17 can drive the two cooperating linkage pulleys 14 to rotate. When the linkage pulleys 14 rotate, the gear shaft 13 can be driven to rotate, and finally drive the driving gear 12 to rotate around a fixed axis. When the driving gear 12 rotates around a fixed axis, each tooth groove hole 10 meshed with it can be driven by each tooth provided thereon, and the corresponding upper steel square tube 6 or lower steel square tube 7 can be gradually driven to translate in the operation mode of a rack and pinion; when locking is required, controlling the displacement control motor 15 to stop can achieve timely locking.

[0060] Preferably, in any of the above solutions, the counterweight mechanism includes a counterweight fixing frame 18 fixedly installed at the right ends of the upper steel square tube 6 and the lower steel square tube 7. A central counterweight shaft 19 is fixedly installed in the middle of the bottom surface of the counterweight space of the counterweight fixing frame 18. A plurality of counterweight disks 20 are sequentially stacked at intervals from top to bottom on the outer side wall of the central counterweight shaft 19.

[0061] By sleeving different numbers of counterweight disks 20 on the central counterweight shaft 19 of the counterweight mechanism, the stable counterweight of the current entire structure can be realized. When adjusting the number of counterweight disks 20, it is relatively convenient and fast, ensuring the adjustability of the counterweight.

[0062] Embodiment 2: Compared with Embodiment 1, the difference of this embodiment is that it further includes the following technical features: Preferably, in any of the above solutions, an upper auxiliary square sleeve 21 and a lower auxiliary square sleeve 22 are respectively fixed to the top and bottom of the mounting bracket 2, and the upper auxiliary square sleeve 21 and the lower auxiliary square sleeve 22 are respectively sleeved on the outer side walls of the upper steel square pipe 6 and the lower steel square pipe 7.

[0063] By adding the upper auxiliary square sleeve 21 and the lower auxiliary square sleeve 22, the purpose of stably constraining the upper steel square pipe 6 and the lower steel square pipe 7 can be achieved, and the stability effect of the upper steel square pipe 6 and the lower steel square pipe 7 during impact operations can be improved.

[0064] Preferably, in any of the above solutions, the boom multi-directional impact unit is used to perform a follow-up impact vibration test on the boom 303 of the cantilever crane in the longitudinal and circumferential directions.

[0065] Preferably, in any of the above solutions, the boom multi-directional impact unit includes a plurality of upper impact cylinders 23 fixedly installed at intervals at the bottom of the left end of the upper steel square pipe 6. The bottoms of the piston rods of the upper impact cylinders 23 all face the top of the boom of the cantilever crane and perform a downward impact test on it during operation. It also includes a plurality of lower impact cylinders 24 fixedly installed at intervals at the top of the left end of the lower steel square pipe 7. The tops of the piston rods of the lower impact cylinders 24 all face the bottom of the boom of the cantilever crane and perform an upward impact test on it during operation.

[0066] In the boom multi-directional impact unit designed in the present invention, when performing an impact test on the boom, the upper impact cylinder 23 is used to complete the downward impact. At the same time, setting a plurality of upper impact cylinders 23 arranged at intervals can achieve synchronous impact tests on different position points at the top of the boom or different position points at the top of the inclined steel suspension rod 305. During the downward impact process, it can play a role in controlling the impact force and impact amplitude; thus, it can achieve simulation tests under different impact test requirements, achieve different graded impact tests, and effectively ensure the test effect and quality.

[0067] In addition, when the boom multi-directional impact unit moves with the cantilever translation mechanism, it can effectively achieve displacement control in the horizontal direction, thus effectively meeting the accurate position control for testing and pressing at different length direction points of the boom.

[0068] Preferably, in any of the above solutions, the bottom of the piston rod of each upper impact cylinder 23 can be used to complete a downward impact on the top of the left end of the boom of the cantilever crane or perform a reciprocating vibration impact on different positions at the top of the steel suspension rod 305. The reciprocating up-and-down movement of the upper impact cylinder 23 is used to achieve the vibration impact on the steel suspension rod 305, so as to simulate the wind load impact under offshore working conditions.

[0069] Considering the use conditions of the cantilever crane boom under strong wind loads or in strong sea winds, specific tests on the wind load of the boom under special conditions are carried out here. By controlling the reciprocating vibration impact, the test can be completed quickly. By controlling different frequencies of the reciprocating test in the test process, the different frequencies of the wind load impact swing of the steel sling rod 305 under different wind speeds and wind load states can be simulated, so as to more objectively and realistically simulate the impacts brought by different wind load changes. At the same time, observe whether the vibration or swing state of the current boom meets the usage requirements under different impact frequencies and amplitudes.

[0070] Preferably, in any of the above solutions, a first piezoelectric impact sensor 25 is installed on the piston rods of each of the lower impact cylinders 24 and each of the upper impact cylinders 23. The first piezoelectric impact sensor 25 is used to collect impact information and transmit its impact signal outward.

[0071] The first piezoelectric impact sensor 25 designed in the present invention can receive impact information when contacting the current boom, effectively ensuring and feeding back the control of impact force, speed and other information.

[0072] Preferably, in any of the above solutions, a follow-up impact measuring mechanism is fixedly installed at the left end of the upper steel square tube 6 and the lower steel square tube 7. The follow-up impact measuring mechanism is composed of two impact measuring components symmetrically arranged on both sides of the cantilever crane boom. The two impact measuring components operate independently during work and control the lateral swing position of the cantilever crane boom.

[0073] Considering the up-and-down impact of the boom, it is also necessary to consider the impact effect under the side-swing state of the boom. During the impact process, the follow-up impact measuring mechanism can effectively adjust the lifting height so that it can face the side wall of the current boom. Start the follow-up impact measuring mechanism to quickly push the side wall of the current boom. When pushing laterally, it can drive the left end of the current boom to swing greatly. Since the right end of the boom is inserted and installed through the right end vertical shaft 301, the entire boom completes a fixed-axis swing around the right end vertical shaft 301, so as to achieve the state of controlling the swing of the entire boom as required, effectively simulating the swing driven under the wind load state.

[0074] Preferably, in any of the above solutions, the impact measurement assembly includes a C-shaped frame 26 fixedly installed on one side of the boom of the cantilever crane. The inner ends of the two horizontal sections of the C-shaped frame 26 are respectively fixedly installed on the corresponding side walls of the left ends of the upper steel square pipe 6 and the lower steel square pipe 7. An installation cavity 27 is provided in the middle of the vertical section of the C-shaped frame 26. A high-strength lead screw 28 is vertically installed in the installation cavity 27. The upper and lower ends of the high-strength lead screw 28 both pass through the installation cavity 27 outwardly through stepped shafts. The top of the high-strength lead screw 28 is connected to a position control motor 29 fixedly installed on the top of the C-shaped frame 26. A lifting slide 30 is sleeved on the outer side wall of the high-strength lead screw 28. The inner end of the lifting slide 30 passes through a through hole 31 inside the installation cavity 27 and is arranged toward one side of the boom of the cantilever crane. A side impact cylinder 32 is fixedly installed on the inner end surface of the lifting slide 30. The piston rod of the side impact cylinder 32 is used to impact the side wall of the left end corresponding to the boom of the cantilever crane.

[0075] When the impact measurement assembly works, the position control motor 29 is started to drive the high-strength lead screw 28 connected to it to rotate. During the rotation of the high-strength lead screw 28, the lifting slide 30 cooperating with it can be driven to rise and fall. During the rise and fall of the lifting slide 30, the side impact cylinder 32 fixedly connected to it can be driven to rise and fall. When the height of the side impact cylinder 32 matches the height of the current boom, the piston rod of the side impact cylinder 32 is controlled to extend and drive the current piston rod to quickly impact the side wall of the boom, so as to realize the lateral impact test, control the impact speed and force of the side impact cylinder 32, and record the swing amplitude and stability of the current boom according to different impact information.

[0076] Preferably, in any of the above solutions, a strong magnetic electromagnet 33 is fixedly installed at the end of the piston rod of the side impact cylinder 32, and a second piezoelectric impact sensor 34 is fixedly installed at the end of the strong magnetic electromagnet 33. The second piezoelectric impact sensor 34 is used to collect impact information and transmit its impact signal outward.

[0077] The second piezoelectric impact sensor 34 can effectively obtain the actual impact information when contacting the boom and upload it at the same time, so as to control the current impact information.

[0078] When the strong magnetic electromagnet 33 is de-energized, it has no magnetic force. The strong magnetic electromagnet 33 follows the telescoping of the piston rod of the side impact cylinder 32 and acts as an impact head to impact the side wall on the corresponding side of the left end of the boom of the cantilever crane, so as to realize its forward swing around the right end vertical shaft 301; when the strong magnetic electromagnet 33 is energized, it has strong magnetic force. By magnetically attracting and cooperating with the side wall on the corresponding side of the left end of the boom of the cantilever crane, the telescoping of the piston rod of the side impact cylinder 32 drives the side wall on the corresponding side of the left end of the boom of the cantilever crane, so as to realize its reverse swing around the right end vertical shaft 301. In this way, reciprocating, to achieve the wind swing anti-vibration safety test of the boom of the cantilever crane under the simulated offshore strong wind condition.

[0079] Embodiment 3: Compared with Embodiment 2, the difference is that it further includes the following technical features: In any of the above solutions, preferably, the root impact unit includes a swing position steel pipe 35 horizontally passing through the vertical track hole 101. On the front and back sides of the middle of the swing position steel pipe 35, coaxially arranged central swing shafts 36 are respectively fixed. The end parts of the two central swing shafts 36 are respectively inserted and fitted into the pipe holes on the corresponding side walls of the moving swing position seats 37 at their corresponding positions. Each moving swing position seat 37 is slidably sleeved on the outside of the rigid frame 1 on both sides of the vertical track hole 101. A swing impact electric cylinder 38 is fixedly installed inside the swing position steel pipe 35. An end swing impact disc 39 is fixedly installed at the left end of the piston rod of the swing impact electric cylinder 38. The end swing impact disc 39 is used to complete impact tests on different parts of the right end vertical shaft 301. On the bottom of each moving swing position seat 37, a connecting part 3701 is horizontally formed. On the bottom surface of the inner frame of the rigid frame 1 below each connecting part 3701, a height control cylinder 40 is fixedly installed. The top of the piston rod of each height control cylinder 40 is fixed to the bottom of the connecting part 3701.

[0080] When the root impact unit works, by controlling the lifting and lowering of two synchronously operating height control cylinders 40, the entire structure can be driven to lift and lower, achieving the purpose of controlling the lifting height of the swing position steel pipe 35 and the swing impact electric cylinder 38 installed inside it, so as to realize impact tests on different height positions of the right end vertical shaft 301 at the right end of the boom. During the impact test, the impact speed and force of the swing impact electric cylinder 38 can be continuously controlled to quickly impact test the rotating root of the boom, so as to complete the control of the key connection part.

[0081] Preferably, in any of the above solutions, hoists 41 are symmetrically installed at the upper and lower parts of the installation cavity of the mounting bracket 2 on the left side of the positioning steel pipe 35. The outer ends of the steel wire ropes 42 wound on each hoist 41 are connected to the fixed lugs 43 at the corresponding positions at the left end of the positioning steel pipe 35. The two hoists 41 cooperate to wind and unwind the ropes to control the swing angle of the central swing axis 36 of the positioning steel pipe 35 around the pipe hole.

[0082] In addition, considering the different impact effects when testing the right vertical shaft 301 at the root connection part of the test boom at different inclination angles, the cooperation between the two hoists 41 at the upper and lower parts is controlled here to achieve the impact force on the two steel wire ropes 42 at the upper and lower parts, so as to control the swing angle of the central swing axis 36 of the entire positioning steel pipe 35 around the pipe hole. At the same time, the angle locking of the positioning steel pipe 35 can be controlled by locking the two hoists 41.

[0083] Specific working principle: Install this device. After the device is installed, fix the assembled boom unit on the left end face of the mounting bracket 2 of this device, and then start this device and conduct multiple impact tests on the installed boom one by one according to the usage requirements and national standards. Specifically, when conducting the impact test, control the linkage mechanism to drive the cantilever translation mechanism to move horizontally. During the movement, the displacement position of the cantilever translation mechanism can be selected according to the installation position and size of the current boom unit 3 of the overhead crane to be tested. When the cantilever translation mechanism moves to the appropriate position, control the corresponding upper impact cylinder 23 and lower impact cylinder 24 of the boom multi-directional impact unit to conduct the impact test. During the impact, control the telescopic speed and force of the upper impact cylinder 23 and the lower impact cylinder 24 to achieve different impact effects. Conduct multiple impact tests when impacting each test point of the boom unit 3 of the overhead crane. During the test, control the impact force and observe and record the stability and vibration state of the boom after each impact force.

[0084] In summary, it can be seen that in the present invention, when conducting the boom impact test on the crane boom, the combination of upper impact and lower impact is adopted, effectively realizing the strength and stability of the current tested boom under different impact conditions; at the same time, relying on the linkage mechanism to control the displacement of the cantilever translation mechanism can achieve the impact test on different length parts of the boom, effectively realizing the anti-impact effect of different cantilever length parts of the boom; during the boom test, the vibration test of the boom distal end and root can be realized, effectively ensuring the effective test of the stability and safety of the boom under the impact state, ensuring the safety test of the boom of the cantilever crane before leaving the factory, and the test results are more reliable.

[0085] During the entire impact test, a counterweight mechanism was added at the tail end to ensure different counterweight requirements during multiple impact tests and to ensure the stability of the entire device during the test. The entire device relies on the lifting mechanism at the bottom to achieve overall lifting, and can control the height of the entire device according to the installation requirements of the current crane boom during test simulation, effectively ensuring that the entire structure can be lifted as needed; during the impact test of the entire boom, relying on the root impact unit can better test the stability of the key root connection part of the boom, ensuring that the anti-impact stability test verification under multiple load conditions is completed for it, and ensuring the reliability of the test results.

[0086] In addition, when the boom test is completed, the impact test force on different parts of the boom can be controlled to simulate different impact conditions, and the difference in the use of the current boom under different impact load conditions can be obtained through multi-level impact force tests, effectively evaluating the anti-impact performance of the boom to be shipped according to the test results. Considering the different operating conditions of the cantilever boom and the requirements for anti-impact and anti-wind load (wind load influence in offshore operating conditions and strong wind environments) during use, the present invention can simulate the safety and stability under wind load impact conditions, effectively achieve flexible simulation of multi-level wind load conditions according to actual test requirements, and better improve the diversity of the test simulation environment.

[0087] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and 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 of this technology, any alternative improvement or transformation made to the embodiments of the present invention falls within the protection scope of the present invention.

[0088] Where the present invention is not described in detail is the well-known technology of those skilled in the art of this technology.

Claims

1. A crane boom component impact test device, characterized in that: It comprises a lifting mechanism, a rigid frame is fixedly installed on the top of the lifting mechanism, a mounting frame is bolted and fixedly installed on the left end working surface of the rigid frame, the left end of the mounting frame is used for mounting a cantilever crane boom unit, a cantilever translation mechanism is installed on the rigid frame, a boom multi-directional impact unit is installed on the left end of the cantilever translation mechanism, the boom multi-directional impact unit is used for completing an impact test on the cantilever crane boom unit to be tested, and a linkage mechanism for driving the cantilever translation mechanism is installed in the rigid frame.

2. The impact testing device for crane boom components according to claim 1, characterized in that: The lifting mechanism includes a plurality of vertically arranged lifting cylinders, the top of each lifting cylinder is fixed to the bottom of the rigid frame, the bottom of each lifting cylinder is fixed to the top of a fixing seat, the fixing seat is fixedly connected to the ground, and each lifting cylinder is in a synchronous lifting state when working.

3. The impact testing device for crane boom components according to claim 2, characterized in that: A vertical track hole is arranged in the middle of the left side wall of the rigid frame, a root impact unit is installed inside the vertical track hole, the left end of the root impact unit is arranged toward the root of the boom unit of the cantilever crane to be tested and is used to implement impact testing on it.

4. The impact testing device for crane boom components according to claim 3 is characterized in that: Open holes for the root impact unit to pass through are arranged on the side walls on the left and right sides of the mounting frame.

5. The impact testing device for crane boom components according to claim 4, characterized in that: The upper and lower ends of the right end vertical shaft of the cantilever crane boom unit are movably inserted in the corresponding rigid shaft seats, and each of the rigid shaft seats is respectively fixedly mounted on the side walls of the mounting frame at the upper and lower parts of the open hole on the left side. The right end vertical shaft is welded and fixedly connected to the cantilever boom, and a lifting hook assembly is installed at the front end of the cantilever boom. A steel lifting rod is arranged on the upper part of the cantilever boom, and the left end of the steel lifting rod is connected to the top of the left end of the cantilever boom, and the right end of the steel lifting rod is fixedly connected to the upper outer wall of the right end vertical shaft.

6. The impact testing device for crane boom components according to claim 5, characterized in that: The cantilever translation mechanism includes an upper steel square tube and a lower steel square tube horizontally arranged at the top and bottom of the rigid frame, two upper main square sleeves arranged at intervals are welded at the bottom of the rigid frame corresponding to the upper steel square tube, and the upper main square sleeve is sleeved on the outer wall of the upper steel square tube, and two lower main square sleeves arranged at intervals are welded at the top of the rigid frame corresponding to the lower steel square tube, and the lower main square sleeve is sleeved on the outer wall of the lower steel square tube; a plurality of tooth slot holes are respectively arranged in an array along the length direction on the opposite side walls of the upper steel square tube and the lower steel square tube, and each of the tooth slot holes is respectively used to engage with the linkage mechanism, a counterweight mechanism is installed at the right end of the upper steel square tube and the lower steel square tube, and the boom multi-directional impact unit is installed at the left end of the upper steel square tube and the lower steel square tube.

7. The impact testing device for crane boom components according to claim 6, characterized in that: The linkage mechanism includes a central through cavity arranged at the center position of the top or bottom of the rigid frame, a driving gear is installed inside the central through cavity, the driving gear is used to mesh with each of the tooth groove holes, the front and rear ends of the gear shaft of the driving gear are both movable to the outside of the rigid frame, a linkage pulley fixedly connected to the gear shaft is fixedly installed on the front end surface of the rigid frame, a shift control motor is fixedly installed on the front end surface of the right middle part of the rigid frame, a driving pulley is fixedly installed on the motor shaft of the shift control motor, and a toothed belt is wound around the driving pulley and the two linkage pulleys.

8. The impact testing device for crane boom components according to claim 7, characterized in that: The counterweight mechanism includes a counterweight fixing frame fixedly installed on the upper steel square tube and the right end of the lower steel square tube, a central counterweight shaft is fixedly installed in the middle of the bottom surface of the counterweight space of the counterweight fixing frame, and a plurality of counterweight plates are stacked in sequence from top to bottom on the outer side wall of the central counterweight shaft.

Images