AGV forklift portal section steel dynamic load and fatigue test bench and test method thereof

Abstract

The invention belongs to the technical field of detection equipment, and particularly relates to an AGV forklift portal section steel dynamic load and fatigue test bench and a test method thereof.The AGV forklift portal section steel dynamic load and fatigue test bench comprises a fixed shell and a sliding seat, the inner wall of the fixed shell is symmetrically and fixedly connected with two guide sliding rods, and the sliding seat is slidably arranged outside the two guide sliding rods; the sliding seat is fixedly provided with portal section steel through a clamp; and the device further comprises a magnetic thrust power assembly, a constant-speed power assembly, a plurality of groups of buffer cleaning assemblies, a plurality of groups of emergency stop assemblies, a laser range finder and a PLC (Programmable Logic Controller). According to the invention, the dynamic load bearing capacity can be judged by simulating the start-stop inertial impact of the AGV forklift and detecting the bending deformation of the portal section steel main body and the base, and the fatigue test data stability is guaranteed at a fixed moving speed, so that the accumulated stress of real operation is equivalently mapped; integrated verification of dynamic performance, fatigue life and sliding pair cleaning protection of the portal profile steel is realized, and whether product quality meets the standard or not is efficiently judged.

Description

Technical Field

[0001] This invention belongs to the field of testing equipment technology, and in particular relates to a dynamic load and fatigue testing bench for AGV forklift mast steel and its testing method. Background Technology

[0002] With the deep integration of intelligent manufacturing and logistics automation, new energy AGV forklifts, with their advantages of low energy consumption, zero emissions, and high automation, have become core material handling equipment in warehousing and logistics, automobile manufacturing, and electronics processing. As a key load-bearing structure of new energy AGV forklifts, the mast steel directly bears the weight of the forks and goods. During forklift start-up, stopping, lifting, and turning operations, it must withstand complex dynamic loads and cyclic fatigue stresses. Its structural strength and reliability directly determine the operational safety, load-bearing capacity, and service life of the AGV forklift. Therefore, conducting precise dynamic load and fatigue performance tests on the mast steel before mass production is a core step in ensuring the overall quality of new energy AGV forklifts.

[0003] Currently, testing equipment for AGV forklift mast steel has been initially applied. However, most existing testing equipment uses cylinders or hydraulic cylinders to directly apply impact loads. This method cannot accurately reproduce the inertial impact process of "acceleration-sudden stop" in the automated operation of AGV forklifts. On the one hand, the load application method differs greatly from the actual stress scenario of the mast steel, making it difficult to simulate the dynamic characteristics of inertial force transmission at the moment of start-stop. On the other hand, most equipment only monitors local stress through stress sensors and does not have specific detection methods for the weak connection between the mast steel body and the base. It cannot capture the bending deformation trend of this part in time, resulting in a deviation in the judgment of the dynamic load-bearing capacity of the mast steel, which is prone to the hidden danger of "passing the test but failing in actual use". Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a dynamic load and fatigue testing bench for AGV forklift mast steel and its testing method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a dynamic load and fatigue test bench for AGV forklift mast steel, comprising a fixed shell and a sliding seat, wherein two guide rods are symmetrically fixedly connected to the inner wall of the fixed shell, and the sliding seat is slidably disposed outside the two guide rods, and the mast steel is fixedly mounted on the sliding seat by a clamp, and further comprising a magnetic thrust assembly, a uniform speed power assembly, multiple sets of buffer cleaning assemblies, multiple sets of emergency stop assemblies, a laser rangefinder and a PLC controller, wherein the magnetic thrust assembly is disposed between the fixed shell and the sliding seat, and generates a magnetic thrust on the sliding seat when energized, causing the mast steel to accelerate. The uniform speed power component is installed at the bottom of the fixed shell and connected to the lower end of the sliding seat. When powered on, it drives the sliding seat to move back and forth at a uniform speed. Multiple sets of buffer cleaning components are fixed to the end of the sliding seat and arranged around the guide slide rod; Multiple emergency stop components are symmetrically fixed to the side wall of the sliding seat to provide emergency braking force for the sliding seat; The laser rangefinder is embedded in the side wall of the fixed housing and is set opposite to the sliding seat to monitor the movement distance of the sliding seat in real time. Two tilt sensors are also installed on the gantry steel frame.

[0006] In the aforementioned AGV forklift mast steel dynamic load and fatigue test bench, the magnetic thrust assembly includes a permanent magnet block one fixedly installed on the side wall of the sliding seat, and an electromagnetic block one fixedly installed on the inner side wall of the fixed shell opposite to the permanent magnet block one. When the electromagnetic block one is energized, it applies a magnetic thrust to the permanent magnet block one.

[0007] In the aforementioned AGV forklift mast steel dynamic load and fatigue test bench, the uniform speed power component includes two symmetrically fixed side plates installed at the bottom of the fixed shell. A reciprocating screw is rotatably connected between the two side plates. A motor for driving the reciprocating screw to rotate is fixedly installed on the outer wall of one of the side plates. A reciprocating seat is threaded onto the rod wall of the reciprocating screw. Multiple electric push rods are symmetrically fixedly connected to the upper end of the reciprocating seat. The upper ends of the multiple electric push rods are fixedly connected to the same lifting plate. Two clamping plates are symmetrically fixedly connected to the upper end of the lifting plate. A connecting block located between the two clamping plates is fixedly connected to the lower end of the sliding seat.

[0008] In the aforementioned AGV forklift mast steel dynamic load and fatigue test bench, the buffer cleaning assembly includes two extension plates fixedly installed on the side wall of the sliding seat. The two extension plates are fixedly connected to the same air hood. A damping rubber frame is fixedly installed at the front end of the air hood. The rear end of the air hood is fixedly connected to a cleaning cylinder through a reversing bend. The inner diameter of the cleaning cylinder is smaller than the inner diameter of the air hood, and the inner diameter of the reversing bend gradually decreases from the end of the air hood to the end of the cleaning cylinder.

[0009] In the aforementioned AGV forklift mast steel dynamic load and fatigue test bench, the emergency stop assembly includes a mounting shell fixedly connected to the side wall of the sliding seat. The side wall of the mounting shell has multiple push rods movably inserted. One end of each push rod located inside the mounting shell is fixedly connected to the same push plate. Multiple return springs sleeved on the push rods are fixedly connected between the push plate and the mounting shell. A second permanent magnet is fixedly connected to the side of the push plate away from the push rods. An electromagnetic block is fixedly installed on the inner wall of the mounting shell, which is opposite to the second permanent magnet. One end of each push rod located outside the mounting shell is fixedly connected to the same brake block.

[0010] In the aforementioned AGV forklift mast steel dynamic load and fatigue test bench, a counterweight assembly is also fixedly installed on the mast steel. The counterweight assembly includes two detachable positioning plates fixedly fixed on the mast steel. Support plates are fixedly connected to the two positioning plates. Multiple fixed columns are fixedly connected to the support plates. Multiple counterweights are placed on the support plates, and the counterweights are inserted into the fixed columns.

[0011] In the aforementioned AGV forklift mast steel dynamic load and fatigue test bench, a limiting slide rod is fixedly connected between the two side plates, and the side wall of the reciprocating seat is provided with a sliding hole that slides and engages with the limiting slide rod.

[0012] The test method for dynamic load and fatigue testing of AGV forklift mast steel includes the following steps: S1. The magnetic thrust assembly provides a variable magnetic thrust to the sliding seat, which accelerates the sliding seat along the guide rod. It can also work with the emergency stop assembly to simulate the start-stop impact load on the gantry steel and monitor in real time whether the gantry steel exceeds its impact resistance strength through the tilt sensor. S2. A uniform speed dynamic component is used to provide uniform speed fatigue testing for the portal frame steel, and the distance moved by the portal frame steel after reaching the fatigue state is calculated cumulatively using a laser rangefinder.

[0013] In the above-mentioned test method for the dynamic load and fatigue test bench of AGV forklift mast steel, during the test, a buffer cleaning component is used to convert the oncoming airflow into a clean airflow, which helps the test work to proceed more smoothly.

[0014] Compared with existing technologies, the advantages of this invention are as follows: 1. By using the set magnetic thrust component, emergency stop component and tilt sensor, a thrust is applied to the gantry steel, causing the gantry steel to accelerate and brake urgently through the emergency stop component, simulating the inertial impact when the AGV forklift starts and stops automatically. At the same time, the tilt sensor is used to detect whether bending deformation occurs between the main body and the base of the gantry steel to determine the load-bearing capacity of the gantry steel, and quickly determine whether the quality of the gantry steel meets the standard under dynamic load.

[0015] 2. By using a uniform speed power component and tilt sensor, the cumulative stress of long-term operation of gantry steel can be accurately simulated. The fixed moving speed can ensure the loading rate of each cycle load, avoid the test data dispersion caused by speed fluctuations, and ensure that the test results can equivalently map the fatigue cumulative effect of real operation.

[0016] 3. The buffer cleaning component can convert the wind resistance experienced by the sliding seat during the test into the power to clean the guide slide rod. It can remove dry dust, floating dust, and fine particles attached to the surface of the guide slide rod, reduce the entry of impurities into the sliding pair gap, and form a buffer protection at the end of the sliding seat to prevent the sliding seat from directly impacting the side wall of the fixed shell, thus avoiding the problem of hard impact force that could damage the test equipment. Attached Figure Description

[0017] Figure 1 This is a left-view three-dimensional structural schematic diagram of the dynamic load and fatigue testing platform for AGV forklift mast steel provided by the present invention; Figure 2 This is a right-view three-dimensional structural diagram of the dynamic load and fatigue test bench for AGV forklift mast steel provided by the present invention; Figure 3 This is a front sectional view of the dynamic load and fatigue test bench for AGV forklift mast steel provided by the present invention. Figure 4 This is a three-dimensional structural schematic diagram of the magnetic propulsion component of the dynamic load and fatigue test bench for AGV forklift mast steel provided by the present invention. Figure 5 This is a three-dimensional structural schematic diagram of the uniform speed power component of the dynamic load and fatigue test bench for AGV forklift mast steel provided by the present invention. Figure 6 This is a three-dimensional structural schematic diagram of the mast steel of the AGV forklift mast steel dynamic load and fatigue test bench provided by the present invention; Figure 7 yes Figure 6 A three-dimensional structural diagram of the counterweight component; Figure 8 This is a three-dimensional structural schematic diagram of the buffer cleaning component of the dynamic load and fatigue test bench for AGV forklift mast steel provided by the present invention. Figure 9 This is a top sectional view of the emergency stop assembly of the dynamic load and fatigue test bench for AGV forklift mast steel provided by the present invention.

[0018] In the diagram: 1. Fixed shell, 2. Sliding seat, 3. Guide slide rod, 4. Gantry steel, 5. Magnetic thrust assembly, 51. Permanent magnet block one, 52. Electromagnetic block one, 6. Uniform speed power assembly, 61. Side plate, 62. Reciprocating screw, 63. Motor, 64. Reciprocating seat, 65. Electric push rod, 66. Lifting plate, 67. Card plate, 68. Connecting block, 69. Limiting slide rod, 7. Buffer cleaning assembly, 71. Extension plate, 72. Air duct, 73. Damping rubber frame, 74. Reversing bend, 75. Cleaning tube, 8. Emergency stop assembly, 81. Mounting shell, 82. Push rod, 83. Push plate, 84. Return spring, 85. Permanent magnet block two, 86. Electromagnetic block two, 87. Brake block, 9. Laser rangefinder, 10. PLC controller, 11. Tilt sensor, 12. Counterweight assembly, 121. Positioning plate, 122. Support plate, 123. Fixed column, 124. Counterweight weight. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] like Figures 1-9 As shown, the AGV forklift mast steel dynamic load and fatigue test bench includes a fixed shell 1 and a sliding seat 2. Two guide rods 3 are symmetrically fixedly connected to the inner wall of the fixed shell 1, and the sliding seat 2 is slidably disposed outside the two guide rods 3. The mast steel 4 is fixedly mounted on the sliding seat 2 by a clamp. It also includes a magnetic thrust assembly 5, a constant speed power assembly 6, multiple sets of buffer cleaning assemblies 7, multiple sets of emergency stop assemblies 8, a laser rangefinder 9, and a PLC controller 10. The magnetic thrust assembly 5 is installed between the fixed shell 1 and the sliding seat 2. When energized, it generates a magnetic thrust on the sliding seat 2, causing the mast steel 4 to accelerate.

[0021] The uniform speed power component 6 is installed at the bottom of the fixed shell 1 and connected to the lower end of the sliding seat 2. When powered on, it drives the sliding seat 2 to move back and forth at a uniform speed. Multiple sets of buffer cleaning components 7 are fixed to the ends of the sliding seat 2 and arranged around the guide slide rod 3; Multiple sets of emergency stop components 8 are symmetrically fixed on the side wall of the sliding seat 2 to provide emergency braking force for the sliding seat 2; The laser rangefinder 9 is embedded in the side wall of the fixed housing 1 and is set opposite to the sliding seat 2 to monitor the moving distance of the sliding seat 2 in real time. Two tilt sensors 11 are also installed on the gantry steel 4.

[0022] As one embodiment of the present invention, refer to Figure 3 and Figure 4The magnetic thrust assembly 5 includes a permanent magnet block 51 fixedly installed on the side wall of the sliding seat 2, and an electromagnetic block 52 fixedly installed on the inner side wall of the fixed shell 1 opposite to the permanent magnet block 51. When the electromagnetic block 52 is energized, it applies a magnetic thrust to the permanent magnet block 51. The magnitude of the magnetic thrust applied by the electromagnetic block 52 to the permanent magnet block 51 varies depending on the magnitude of the energizing current. The larger the energizing current, the larger the applied magnetic thrust, thereby meeting the testing requirements of different dynamic loads.

[0023] Under the above conditions, the magnetic thrust applied by the energized electromagnetic block 52 to the permanent magnet block 51 can act on the sliding seat 2, thereby causing the sliding seat 2 to move faster along the guide rod 3. Different dynamic loads are applied based on the magnitude of the energized current, providing power for dynamic load testing.

[0024] As one embodiment of the present invention, refer to Figure 1 , Figure 2 , Figure 3 and Figure 5 The uniform speed power assembly 6 includes two symmetrically fixed side plates 61 at the bottom of the fixed housing 1. A reciprocating screw 62 is rotatably connected between the two side plates 61. A motor 63 for driving the reciprocating screw 62 to rotate is fixedly installed on the outer wall of one of the side plates 61. A reciprocating seat 64 is threaded onto the rod wall of the reciprocating screw 62. Multiple electric actuators 65 are symmetrically fixedly connected to the upper end of the reciprocating seat 64. The upper ends of the multiple electric actuators 65 are fixedly connected to the same lifting plate 66. The upper end of the lifting plate 66 is symmetrically fixed... Two clamping plates 67 are connected. The lower end of the sliding seat 2 is fixedly connected to a connecting block 68 located between the two clamping plates 67. The clamping plates 67 are pushed by the electric push rod 65 to move the lifting plate 66 upward, so that the two clamping plates 67 abut against the two sides of the connecting block 68, realizing the relative connection between the entire uniform speed power assembly 6 and the sliding seat 2, providing uniform speed fatigue test power for the gantry steel 4. A limiting slide rod 69 is also fixedly connected between the two side plates 61. The side wall of the reciprocating seat 64 is provided with a sliding hole that slides and engages with the limiting slide rod 69.

[0025] Under the above conditions, the motor 63 drives the reciprocating screw 62 to rotate. Through the threaded connection between the reciprocating screw 62 and the reciprocating seat 64, the reciprocating seat 64 drives the lifting plate 66 to move at a constant speed, which in turn drives the sliding seat 2 to move at a constant speed. This simulates the cumulative stress of the gantry steel 4 during long-term operation. The fixed moving speed can ensure the loading rate of each cycle load, avoid the test data dispersion caused by speed fluctuations, and ensure that the test results can equivalently map the fatigue accumulation effect of real operation.

[0026] As one embodiment of the present invention, refer to Figure 1 , Figure 2 , Figure 3 and Figure 8The buffer cleaning assembly 7 includes two extension plates 71 fixedly installed on the side wall of the sliding seat 2. The same air duct 72 is fixedly connected between the two extension plates 71. A damping rubber frame 73 is fixedly installed at the front end of the air duct 72. The rear end of the air duct 72 is fixedly connected to a cleaning cylinder 75 through a reversing bend 74. The inner diameter of the cleaning cylinder 75 is smaller than the inner diameter of the air duct 72, and the inner diameter of the reversing bend 74 gradually decreases from the end of the air duct 72 to the end of the cleaning cylinder 75.

[0027] Under the above-mentioned conditions, when the sliding seat 2 moves, the airflow on its windward side will naturally enter the air hood 72, and after being guided by the reversing bend 74, it will be delivered to the cleaning tube 75. The airflow directionally sprayed by the cleaning tube 75 can quickly blow away the dust and impurities adhering to the surface of the guide slide rod 3, effectively avoiding the problems of sliding seat 2 sliding jamming and excessive friction wear caused by the accumulation of impurities. At the same time, the damping rubber frame 73 connected to the end of the air hood 72 can provide a buffering and shock absorption protection when the sliding seat 2 contacts the inner side of the fixed shell 1 due to overload, which can avoid the damage caused by hard impact collision. To mitigate the risk of damage to the testing equipment, and because the inner diameter of the cleaning tube 75 is smaller than that of the air hood 72, the flow velocity and dynamic pressure are increased through cross-sectional contraction (based on the continuity equation and Bernoulli's equation), ensuring that the airflow has sufficient impact force to remove dust and impurities from the surface of the guide slide rod 3. In conjunction with the fact that the inner diameter of the reversing bend 74 gradually decreases from the end of the air hood 72 to the end of the cleaning tube 75, the conversion of airflow velocity is further improved. Moreover, the corner of the reversing bend 74 is rounded (radius of curvature ≥ 5 mm) to reduce airflow resistance and ensure that the airflow velocity attenuation after guidance is ≤ 10%.

[0028] As one embodiment of the present invention, refer to Figure 1 , Figure 2 , Figure 3 and Figure 9 The emergency stop assembly 8 includes a mounting shell 81 fixedly connected to the side wall of the sliding seat 2. The side wall of the mounting shell 81 is movably fitted with multiple push rods 82. One end of the multiple push rods 82 located inside the mounting shell 81 is fixedly connected to the same push plate 83. Multiple return springs 84 sleeved on the outside of the push rods 82 are fixedly connected between the push plate 83 and the mounting shell 81. A permanent magnet block 85 is fixedly connected to the side of the push plate 83 away from the push rods 82. An electromagnetic block 86 is fixedly installed on the inner wall of the mounting shell 81, which is opposite to the permanent magnet block 85. One end of the multiple push rods 82 located outside the mounting shell 81 is fixedly connected to the same brake block 87.

[0029] Under the above conditions, when the second electromagnetic block 86 is energized, it generates the same polarity as the second permanent magnet block 85, thereby applying a magnetic thrust to the second permanent magnet block 85 and providing a pushing force to the pushing plate 83. The pushing plate 83, in conjunction with the pushing rod 82, moves against the elastic force of the return spring 84, causing the brake block 87 to extend and contact the inner wall of the fixed shell 1, generating frictional resistance and assisting the sliding seat 2 to brake quickly. Moreover, the greater the power supply current of the first electromagnetic block 52, the greater the power supply current of the power supply equipment to the second electromagnetic block 86, which increases the frictional resistance between the brake block 87 and the fixed shell 1, realizing adaptive matching of braking force and providing a better impact load test environment for the gantry steel 4 in the start and stop state.

[0030] As one embodiment of the present invention, refer to Figure 1 , Figure 2 , Figure 3 and Figure 9 A counterweight assembly 12 is also fixedly installed on the gantry steel 4. The counterweight assembly 12 includes two detachable positioning plates 121 fixedly fixed on the gantry steel 4. Support plates 122 are fixedly connected to the two positioning plates 121. Multiple fixing columns 123 are fixedly connected to the support plates 122. Multiple counterweights 124 are placed on the support plates 122, and the counterweights 124 are inserted into the fixing columns 123.

[0031] Under the above-mentioned conditions, by adding different numbers and weights of counterweights 124, the load on the gantry steel 4 can be adjusted and varied, and tests can be conducted according to different load strengths of the gantry steel 4, resulting in a better test range and effect.

[0032] The operating principle of the present invention is described as follows: The gantry steel 4 to be tested is fixed on the sliding seat 2 by a clamp, and the two positioning plates 121 of the counterweight assembly 12 are fixed on the gantry steel 4 by bolts. According to the test requirements and the actual load of the gantry steel 4, the corresponding weight of the counterweight 124 is placed on the support plate 122, and the gantry steel 4 is provided with additional counterweight by the relative limiting of the fixing column 123. During the emergency stop impact force test of the dynamic load of the gantry steel 4, the PLC controller 10 controls the power supply equipment to supply power to the electromagnetic block 52. The electromagnetic block 52 generates the same polarity as the permanent magnet block 51 when energized, thereby applying a magnetic thrust to the sliding seat 2, causing the sliding seat 2 to slide along the guide rod 3. The greater the current supplied by the power supply equipment to the electromagnetic block 52, the greater the acceleration of the sliding seat 2. The sliding seat 2 drives the gantry steel 4 to slide quickly. The laser rangefinder 9 monitors the sliding distance of the sliding seat 2 in real time. When the laser rangefinder 9 detects that the sliding seat 2 has slid to the preset distance, the PLC controller 10 controls the emergency stop component 8 to work. The PLC controller 10 controls the power supply equipment to supply power to the electromagnetic block 86 in the emergency stop assembly 8. When the electromagnetic block 86 is energized, it generates the same polarity as the permanent magnet block 85, thereby applying a magnetic thrust to the push plate 83. The push plate 83, in conjunction with the push rod 82, pushes the brake block 87 to move, causing the brake block 87 to contact the inner wall of the fixed shell 1, causing the sliding seat 2 to brake and stop quickly, thereby applying an inertial impact force to the gantry steel 4. The tilt sensor 11 detects whether the main body of the gantry steel 4 and its base have undergone relative bending deformation. The tilt sensor 11 uses a built-in accelerometer and gyroscope to accurately determine whether bending deformation has occurred, thereby determining whether the gantry steel 4 can withstand the damage caused by the current inertial impact force. The PLC controller 10 can adjust the power supply current supplied to the electromagnetic block 52 by the power supply equipment to meet the test requirements of different inertial impact forces. When the emergency stop component 8 is working, the PLC controller 10 automatically adjusts the current supplied to the electromagnetic block 86 by the power supply equipment based on the power supply current supplied to the electromagnetic block 52 and the counterweight of the gantry steel 4. Specifically, when the current supplied to the electromagnetic block 52 is greater or the counterweight of the gantry steel 4 is greater, the PLC controller 10 controls the power supply equipment to supply a larger current to the electromagnetic block 86, so that the brake block 87 has a greater frictional squeezing force with the fixed shell 1, thereby improving the emergency stop braking effect of the sliding seat 2. When fatigue testing of the gantry steel 4 is required, the PLC controller 10 controls the electric push rod 65 to push the lifting plate 66 upward, which in turn drives the two clamping plates 67 upward, so that the two clamping plates 67 abut against the two sides of the connecting block 68, thereby realizing the relative connection between the lifting plate 66 and the sliding seat 2. The PLC controller 10 then controls the motor 63 to start, and the motor 63 drives the reciprocating screw 62 to rotate. Through the threaded connection between the reciprocating screw 62 and the reciprocating seat 64, the reciprocating seat 64 drives the lifting plate 66 to move back and forth, which in turn drives the sliding seat 2 to move back and forth along the guide slide rod 3, thereby simulating the cumulative stress of the gantry steel 4 under long-term operation. The fixed moving speed can ensure that the loading rate of each cycle load is stable, avoiding the test data dispersion caused by speed fluctuations, so that the test results can be equivalently mapped to the fatigue cumulative effect of real operation. Similarly, the tilt sensor 11 is used to determine whether the gantry steel 4 is deformed or damaged, and the laser rangefinder 9 is used to cumulatively measure the moving distance of the sliding seat 2 to confirm the actual test path, giving more accurate test results. During the test, when the sliding seat 2 moves, the airflow on its windward side will naturally enter the air hood 72 of the buffer cleaning component 7. After being guided by the reversing bend 74, it will be delivered to the cleaning tube 75. The airflow sprayed directionally from the cleaning tube 75 can quickly blow off the dust and impurities adhering to the surface of the guide slide rod 3, effectively avoiding the problems of sliding seat 2 being stuck and excessive friction wear caused by the accumulation of impurities. At the same time, the damping rubber frame 73 connected to the end of the air hood 72 can provide buffering and shock absorption protection when the sliding seat 2 contacts the inner side of the fixed shell 1 due to overload, which can avoid the risk of damage to the entire test equipment caused by hard impact collision.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dynamic load and fatigue testing platform for AGV forklift mast steel, comprising a fixed shell (1) and a sliding seat (2), wherein two guide rods (3) are symmetrically fixedly connected to the inner wall of the fixed shell (1), and the sliding seat (2) is slidably disposed outside the two guide rods (3), and a mast steel (4) is fixedly mounted on the sliding seat (2) by a clamp, characterized in that, It also includes a magnetic thrust assembly (5), a constant speed power assembly (6), multiple sets of buffer cleaning assemblies (7), multiple sets of emergency stop assemblies (8), a laser rangefinder (9) and a PLC controller (10). The magnetic thrust assembly (5) is installed between the fixed shell (1) and the sliding seat (2). When energized, it generates magnetic thrust on the sliding seat (2), causing the gantry steel (4) to accelerate. The uniform speed power component (6) is installed at the bottom of the fixed shell (1) and connected to the lower end of the sliding seat (2). When powered on, the sliding seat (2) moves back and forth at a uniform speed. Multiple sets of buffer cleaning components (7) are fixed to the end of the sliding seat (2) and arranged around the guide slide rod (3); Multiple emergency stop components (8) are symmetrically fixed on the side wall of the sliding seat (2) to provide emergency braking force for the sliding seat (2); The laser rangefinder (9) is embedded in the side wall of the fixed shell (1) and is set opposite to the sliding seat (2) to monitor the moving distance of the sliding seat (2) in real time. Two tilt sensors (11) are also installed on the gantry steel (4).

2. The AGV forklift mast steel dynamic load and fatigue testing bench according to claim 1, characterized in that, The magnetic thrust assembly (5) includes a permanent magnet block (51) fixedly installed on the side wall of the sliding seat (2), and an electromagnetic block (52) fixedly installed on the inner side wall of the fixed shell (1) opposite to the permanent magnet block (51). The electromagnetic block (52) is energized to apply magnetic thrust to the permanent magnet block (51).

3. The AGV forklift mast steel dynamic load and fatigue testing bench according to claim 1, characterized in that, The uniform speed power assembly (6) includes two side plates (61) symmetrically fixedly installed at the bottom of the fixed shell (1). A reciprocating screw (62) is rotatably connected between the two side plates (61). A motor (63) for driving the reciprocating screw (62) to rotate is fixedly installed on the outer wall of one of the side plates (61). A reciprocating seat (64) is threaded onto the rod wall of the reciprocating screw (62). Multiple electric actuators (65) are symmetrically fixedly connected to the upper end of the reciprocating seat (64). The same lifting plate (66) is fixedly connected to the upper end of the multiple electric actuators (65). Two clamping plates (67) are symmetrically fixedly connected to the upper end of the lifting plate (66). A connecting block (68) located between the two clamping plates (67) is fixedly connected to the lower end of the sliding seat (2).

4. The AGV forklift mast steel dynamic load and fatigue testing bench according to claim 1, characterized in that, The buffer cleaning assembly (7) includes two extension plates (71) fixedly installed on the side wall of the sliding seat (2). The two extension plates (71) are fixedly connected to the same air hood (72). A damping rubber frame (73) is fixedly installed at the front end of the air hood (72). The rear end of the air hood (72) is fixedly connected to a cleaning cylinder (75) through a reversing bend (74). The inner diameter of the cleaning cylinder (75) is smaller than the inner diameter of the air hood (72), and the inner diameter of the reversing bend (74) gradually decreases from the end of the air hood (72) to the end of the cleaning cylinder (75).

5. The AGV forklift mast steel dynamic load and fatigue testing bench according to claim 1, characterized in that, The emergency stop assembly (8) includes a mounting shell (81) fixedly connected to the side wall of the sliding seat (2). The side wall of the mounting shell (81) is movably fitted with multiple push rods (82). One end of each push rod (82) located inside the mounting shell (81) is fixedly connected to the same push plate (83). Multiple return springs (84) sleeved on the outside of the push rods (82) are fixedly connected between the push plate (83) and the mounting shell (81). A permanent magnet block (85) is fixedly connected to the side of the push plate (83) away from the push rods (82). An electromagnetic block (86) is fixedly installed on the inner wall of the mounting shell (81) opposite to the permanent magnet block (85). One end of each push rod (82) located outside the mounting shell (81) is fixedly connected to the same brake block (87).

6. The AGV forklift mast steel dynamic load and fatigue testing bench according to claim 1, characterized in that, A counterweight assembly (12) is also fixedly installed on the gantry steel (4). The counterweight assembly (12) includes two positioning plates (121) that are detachably fixed on the gantry steel (4). Support plates (122) are fixedly connected to the two positioning plates (121). Multiple fixing columns (123) are fixedly connected to the support plates (122). Multiple counterweights (124) are placed on the support plates (122), and the counterweights (124) are inserted into the fixing columns (123).

7. The AGV forklift mast steel dynamic load and fatigue testing bench according to claim 3, characterized in that, A limiting slide rod (69) is fixedly connected between the two side plates (61), and the side wall of the reciprocating seat (64) is provided with a sliding hole that slides and engages with the limiting slide rod (69).

8. A test method for a dynamic load and fatigue test bench for AGV forklift mast steel, comprising the dynamic load and fatigue test bench for AGV forklift mast steel as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. The magnetic thrust assembly (5) provides a variable magnetic thrust to the sliding seat (2), which accelerates the sliding seat (2) along the guide slide (3) and can work with the emergency stop assembly (8) to simulate the start-stop impact load on the gantry steel (4). The tilt sensor (11) monitors in real time whether the gantry steel (4) exceeds the impact resistance strength. S2. A uniform speed power assembly (6) is used to provide uniform speed fatigue testing for the gantry steel (4), and the distance moved by the gantry steel (4) after reaching the fatigue state is calculated by a laser rangefinder (9).

9. The test method for the dynamic load and fatigue test bench of the AGV forklift mast steel according to claim 8, characterized in that, During the test, the buffer cleaning component (7) is used to convert the incoming airflow into a clean airflow, which helps the test work to proceed more smoothly.

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