Crane turntable fatigue test device and test method
By designing the fatigue test device of the crane turntable, fixing the test pieces using positioning and clamping mechanisms, and using the actuator to perform alternating loads, the problems of high test costs and inaccurate data of large cranes are solved, and efficient and accurate fatigue tests are achieved .
Patent Information
- Application Number
- CN202411393989.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-08
- Publication Date
- 2025-01-14
AI Technical Summary
When performing fatigue tests of large cranes, the production cost of node specimens is high and the testing cost is high, and it is not convenient to effectively and quickly fix the specimens, resulting in inaccurate test data and difficult to meet the size and load of large cranes. Require.
Design a fatigue test device for the crane rotary table, fix the top of the test piece through the positioning mechanism, fix the bottom end of the test piece by the clamping mechanism, and use the actuator to drive the mount to perform alternating load on the test piece, reducing the test cost and improving the test efficiency.
The accuracy and efficiency of the test data are improved, the test cost is reduced, and it is suitable for fatigue tests of large cranes. By selecting the appropriate size and position of the test pieces, the stability of the test and data accuracy are improved.
Smart Images
Figure CN119309792A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of engineering machinery, and in particular to a crane turntable fatigue test device and a test method. Background Art
[0002] The mechanical structure of a general marine crane is mainly composed of a base column, a tower body and a boom, among which the tower body and the boom structure are mostly made into a box-type structure, and a rotary drive device is installed inside the tower body structure. With the changes and demands of the market, many ships need large cranes, which are characterized by a high tower body, a long boom length and a large lifting weight. However, marine products need to consider the requirements of lightweight, so the tower body and the boom are optimized to a truss structure. The tower body is a truss structure connected by front and rear tie rods, mainly composed of a front pressure rod and a rear tie rod. In order to meet the load-bearing requirements, the front pressure rod, the rear tie rod and the turntable are welded. There are many welds at this position. Although the structural strength is calculated, the quality of the complex weld structure cannot be simulated. Considering that the structure is subjected to alternating loads during use, the quality of the weld needs further experimental verification.
[0003] When using the above technology, it was found that the following technical problems exist in the prior art: due to the large size of the front pressure rod, rear pull rod and turntable structure of the large crane, when conducting fatigue tests, if a complete and relatively large node is taken, the size and load of the domestic test bench cannot meet the requirements. Secondly, the production cost and test cost of the complete and relatively large node specimens are high. Taking all factors into consideration, the local position of the docking area is selected for testing, and the prior art is not convenient for effectively and quickly clamping and fixing the specimens at the obtained local position, thereby ensuring the accuracy of the fatigue test data and improving the efficiency of the user. To this end, we designed a crane turntable fatigue test device and test method to provide another technical solution to the above technical problems. Summary of the invention
[0004] Based on this, it is necessary to provide a crane turntable fatigue test device and test method to address the above technical problems. When in use, the cut specimen is selected and placed between the base pad and the mounting seat, and then the positioning mechanism is used to limit and fix the top of the specimen, and the clamping mechanism is used to fix and limit the bottom of the specimen, and then the actuator is started to drive the mounting seat to apply alternating load to the specimen, so that the actuator tests the specimen, thereby testing the selected area specimen through calculation, and reducing the test cost.
[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: A crane turntable fatigue test device comprises an operating base and a test piece, wherein the test piece is arranged at the top of the operating base, columns are fixed at both ends of the top of the operating base, an adjusting block is slidably connected to the top of the inside of the column, a supporting top seat is fixed at the top of the adjusting block, an actuator is assembled at the bottom of the supporting top seat, a mounting seat is fixed at the output end of the actuator, positioning mechanisms for fixing the top of the test piece are arranged at both ends of the mounting seat, a bottom pad is fixed at the top of the operating base, and clamping mechanisms for fixing the bottom of the test piece are arranged at both ends of the bottom pad.
[0006] As a preferred embodiment of the crane turntable fatigue test device provided by the present invention, the positioning mechanism includes a threaded sleeve, a screw rod, a buckle and a pressure plate, and rectangular mounting grooves are provided at both ends of the interior of the mounting seat. The inner side of the mounting groove is rotatably connected with a threaded sleeve, and the internal thread of the threaded sleeve is connected with a screw rod. The end of the screw rod away from the threaded sleeve is rotatably connected with a buckle, and the outer side of the screw rod is sleeved with a pressure plate, and the buckle is slidably connected to the pressure plate.
[0007] As a preferred embodiment of the crane turntable fatigue testing device provided by the present invention, the outer side of the screw rod is slidably connected to the top of the specimen, the top of the pressure plate resists the specimen, and the connection point between the screw rod and the buckle is eccentric to the center of the buckle.
[0008] As a preferred embodiment of the crane turntable fatigue test device provided by the present invention, the clamping mechanism includes an electric push rod, a limit block, a rotating block, a driving block, a limit block and a driving seat, rectangular grooves are provided at both ends of the bottom pad, the inner side of the rectangular groove is rotatably connected with a rotating block, the top of the rotating block is rotatably connected with the limit block, one end of the limit block is rotatably connected with the limit block, the end of the limit block away from the limit block is rotatably connected with the driving seat, one end of the driving seat is rotatably connected with the driving block, and the end of the driving block away from the driving seat is rotatably connected to the center of the rotating block.
[0009] As a preferred embodiment of the crane turntable fatigue testing device provided by the present invention, electric push rods are installed at both ends inside the operating base, the output end of the electric push rods is fixed to the driving seat, and the other end of the limit block is clamped with the bottom end of the specimen.
[0010] As a preferred embodiment of the crane turntable fatigue test device provided by the present invention, a limit assembly is provided at one end of the two columns away from each other, the limit assembly includes a U-shaped limit block and a latch, a plurality of limit grooves are provided inside the adjustment block, a U-shaped limit block is fixed at one end of the column, a latch is slidably connected inside the U-shaped limit block, and one end of the latch is slidably connected to the corresponding limit groove.
[0011] As a preferred embodiment of the crane turntable fatigue test device provided by the present invention, it also includes a turntable, a rear pull rod is welded at one end of the top of the turntable, and a front pressure rod is welded at the other end of the top of the turntable, the top of the rear pull rod is connected to the front pressure rod by welding, and the front pressure rod and the rear pull rod adopt a box-type structure.
[0012] As a preferred embodiment of the crane turntable fatigue test device provided by the present invention, flanges are welded on the top and bottom ends of the specimen, reinforcing ribs are welded on both sides of the top and bottom ends of the specimen, and the reinforcing ribs are welded to the flanges.
[0013] As a preferred implementation of the crane turntable fatigue test method provided by the present invention, the crane turntable fatigue test method comprises the following steps: S1. Cut the position where the front pressure rod and the turntable are connected, and make a specimen as a fatigue test node; S2. The top and bottom of the specimen are welded to the flange and the reinforcing ribs respectively. In order to facilitate the installation and clamping of the specimen, the reinforcing ribs are used to enhance the stability of the flange and ensure sufficient strength. S3. Place the test piece between the base pad and the mounting seat; S4, start the electric push rods at both ends of the operating base to drive the limit blocks to fix the bottom end of the test piece; S5, driving the mounting seat to contact the top of the specimen through the output end of the actuator, and then rotating the screw rod to engage with the top of the specimen, so that the buckle drives the pressing piece to fix the top of the specimen; S6. When the specimen is fixed and stable, the actuator is started to drive the mounting seat to generate an alternating load on the specimen. By continuously loading the alternating load, fatigue verification of the specimen is achieved.
[0014] As a preferred implementation of the crane turntable fatigue test method provided by the present invention, in S1, when cutting the test piece, 1 / 3 of the total length of the front pressure rod in the length direction and the width direction is selected, and the selection principle is determined according to the bearing capacity of the complete cross-section of the front pressure rod and the capacity of the test bench.
[0015] It can be seen without a doubt that the above-mentioned technical solution of the present application can definitely solve the technical problem to be solved by the present application.
[0016] At the same time, through the above technical solutions, the present invention has at least the following beneficial effects: The present invention provides a crane turntable fatigue test device and test method: 1. The positioning mechanism is used to limit and fix the top of the specimen, and the clamping mechanism is used to fix and limit the bottom of the specimen. Under the condition of ensuring the accuracy of the test data of the specimen, the specimen can be quickly disassembled and installed, and then the actuator is started to drive the mounting seat to perform fatigue test on the specimen; 2. By selecting 1 / 3 of the total length of the front pressure bar in the length and width directions, the selection principle is based on the bearing capacity of the complete section of the front pressure bar and the capacity of the test bench. For example, if the bearing capacity of the complete section is 00KN of the mounting seat and the capacity of the test bench is 400KN, then only 400 / mounting seat 00=1 / 2.5 is needed, and the test bench can meet the requirements. Considering the margin, 1 / 3 is taken, and the section opposite to the side of the length and width of the complete section is translated to form a closed intercepted section, and then the specimen is formed as a fatigue test node, so as to make accurate test nodes and increase data stability; 3. The adjusting block is adjusted to drive the support top seat and the actuator to move upward. When the movement reaches a suitable height for fixing the specimen, one end of the pin is engaged with the corresponding limit groove to facilitate improving the stability of the adjusting block, the support top seat and the actuator. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.
[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the connection structure between the new column and the adjustment block of the utility model; Figure 3 This is a schematic diagram of the connection structure between the latch and the adjustment block of the present invention; Figure 4 It is a schematic diagram of the positioning mechanism structure of the present invention; Figure 5 It is a schematic diagram of the structure of the clamping mechanism of the present invention; Figure 6 It is a schematic diagram of the connection structure between the turntable, the rear pull rod and the front pressure rod of the present invention; Figure 7It is a schematic diagram of the cross-sectional structure of the test piece of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the test piece of the present invention; Fig. 9 It is a schematic diagram of the connection structure between the test piece of the present invention, the flange and the reinforcing ribs.
[0019] In the figure: 1. operating base; 2. column; 3. adjustment block; 4. supporting top seat; 5. test piece; 6. bottom pad; 7. actuator; 8. U-shaped limit block; 9. latch; 10. mounting seat; 11. threaded sleeve; 12. screw rod; 13. buckle; 14. pressure plate; 15. electric push rod; 16. limit block; 17. rotating block; 18. driving block; 19. limit block; 20. driving seat; 21. rear pull rod; 22. turntable; 23. front pressure rod; 24. flange; 25. reinforcing rib. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0021] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.
[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.
[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings. Example 1
[0024] Please refer to Figure 1-Figure 7 A fatigue test device and test method for a crane turntable, comprising an operating base 1 and a test piece 5, wherein the test piece 5 is arranged at the top of the operating base 1, and columns 2 are fixed at both ends of the top of the operating base 1, and an adjusting block 3 is slidably connected to the top of the column 2, and a supporting top seat 4 is fixed at the top of the adjusting block 3, and an actuator 7 is assembled at the bottom of the supporting top seat 4, and a mounting seat 10 is fixed at the output end of the actuator 7, and positioning mechanisms for fixing the top of the test piece 5 are arranged at both ends of the mounting seat 10, and a bottom pad 6 is fixed at the top of the operating base 1, and clamping mechanisms for fixing the bottom of the test piece 5 are arranged at both ends of the bottom pad 6; When in use, the cut specimen 5 is selected and placed between the bottom pad 6 and the mounting seat 10, and then the top of the specimen 5 is limited and fixed by the positioning mechanism, and the clamping mechanism is used to fix and limit the bottom of the specimen 5, and then the actuator 7 is started to drive the mounting seat 10 to apply alternating load to the specimen 5, so that the actuator 7 tests the specimen 5, thereby testing the selected area specimen 5 through calculation, and reducing the test cost; The positioning mechanism includes a threaded sleeve 11, a screw rod 12, a buckle 13 and a pressure piece 14. Rectangular mounting grooves are provided at both ends of the mounting seat 10. The inner side of the mounting groove is rotatably connected with the threaded sleeve 11. The inner thread of the threaded sleeve 11 is connected with the screw rod 12. The end of the screw rod 12 away from the threaded sleeve 11 is rotatably connected with the buckle 13. The outer side of the screw rod 12 is sleeved with a pressure piece 14. The buckle 13 is slidably connected with the pressure piece 14. Specifically, when the test piece 5 is placed on the top of the base pad 6, the screw rod 12 and the threaded sleeve 11 are slidably connected according to the position of the top of the test piece 5, so that the screw rod 12 is inside the top of the test piece 5, and then the longitude rotation buckle 13 drives the screw rod 12 and the threaded sleeve 11 to rotate, and the buckle 13 drives the pressure piece 14 to adjust according to the thickness of the top of the test piece 5. When the pressure piece 14 is adjusted to fit the test piece 5, the latitude rotation buckle 13 squeezes the pressure piece 14, so that the pressure piece 14 applies pressure to resist the top of the test piece 5, so as to fix and limit the top of the test piece 5, and at the same time improve the convenience and quickness of disassembling the test piece 5; The outer side of the screw rod 12 is slidably connected to the top of the test piece 5, and the top of the pressing piece 14 resists the test piece 5. The connection point between the screw rod 12 and the buckle 13 is eccentric to the center of the buckle 13, and the buckle 13 effectively plays a good role of squeezing and fixing; The clamping mechanism includes an electric push rod 15, a limit block 16, a rotating block 17, a driving block 18, a limit block 19 and a driving seat 20. Rectangular grooves are provided at both ends of the bottom pad 6. The inner side of the rectangular groove is rotatably connected with the rotating block 17. The top of the rotating block 17 is rotatably connected with the limit block 16. One end of the limit block 16 is rotatably connected with the limit block 19. The end of the limit block 19 away from the limit block 16 is rotatably connected with the driving seat 20. One end of the driving seat 20 is rotatably connected with the driving block 18. The end of the driving block 18 away from the driving seat 20 is rotatably connected to the center of the rotating block 17. The two ends of the operating base 1 are equipped with electric push rods 15, the output end of the electric push rod 15 is fixed to the driving seat 20, and the other end of the limit block 16 is clamped to the bottom end of the test piece 5; Specifically, when the specimen 5 is placed above the bottom pad 6, the electric push rod 15 is started to drive the driving seat 20 to move upward, and the driving seat 20 drives the driving block 18 to squeeze the rotating block 17, and the rotating block 17 rotates along the connection with the bottom pad 6, and the rotating block 17 drives the limiting block 16 to move in the direction of the specimen 5. At this time, one end of the limiting block 16 effectively resists the contact with the specimen 5, and the rotation of the limiting block 19 effectively limits the limiting block 16, so as to improve the stability of the movement of the limiting block 16, so that the limiting block 16 effectively limits and fixes the bottom end of the specimen 5; A limiting assembly is provided at one end of the two columns 2 that are away from each other. The limiting assembly includes a U-shaped limiting block 8 and a latch 9. A plurality of limiting grooves are provided inside the adjusting block 3. A U-shaped limiting block 8 is fixed to one end of the column 2. The latch 9 is slidably connected inside the U-shaped limiting block 8. One end of the latch 9 is slidably connected to the corresponding limiting groove. When the height of the test piece 5 is too high, the adjusting block 3 is adjusted to drive the supporting top seat 4 and the actuator 7 to move upward. When the height is moved to a suitable height for fixing the test piece 5, one end of the latch 9 is engaged with the corresponding limit groove, so as to improve the stability of the adjusting block 3, the supporting top seat 4 and the actuator 7. It also includes a turntable 22, one end of the top of the turntable 22 is welded with a rear pull rod 21, the other end of the top of the turntable 22 is welded with a front pressure rod 23, the top of the rear pull rod 21 and the front pressure rod 23 are connected by welding, and the front pressure rod 23 and the rear pull rod 21 adopt a box-type structure; Flanges 24 are welded to the top and bottom of the specimen 5, and reinforcing ribs 25 are welded to both sides of the top and bottom of the specimen 5. The reinforcing ribs 25 are welded to the flanges 24. The flanges 24 and the reinforcing ribs 25 facilitate the installation of the specimen 5 and increase the stability and accuracy of the specimen 5 during the test. Example 2
[0025] Reference Figure 6-Figure 9 , a crane turntable fatigue test device and test method, a crane turntable fatigue test node manufacturing method, characterized in that it includes the following steps: S1. Cutting is performed by selecting the position where the front pressure rod 23 and the turntable 22 are connected, and a test piece 5 is produced as a fatigue test node. There are many welding points in the area where the turntable 22 and the front pressure rod 23 are connected. Therefore, the test piece 5 in this area is cut and selected by calculation, so that the test piece 5 in this area can be tested between the bottom pad 6 and the mounting seat 10, so as to effectively obtain the fatigue value of the test piece 5. S2. The top and bottom ends of the specimen 5 are welded to the flange 24 and the reinforcing rib 25 respectively. In order to facilitate the installation and clamping of the specimen 5, the reinforcing rib 25 is used to strengthen the stability of the flange 24 and ensure sufficient strength. S3, placing the test piece 5 between the base pad 6 and the mounting seat 10; S4, starting the electric push rods 15 at both ends of the operating base 1 to drive the limit blocks 16 to fix the bottom end of the test piece 5; S5, the output end of the actuator 7 drives the mounting seat 10 to contact the top of the test piece 5, and then the screw rod 12 is rotated to engage with the top of the test piece 5, so that the buckle 13 drives the pressing piece 14 to fix the top of the test piece 5; The electric push rod 15 drives the limit block 16 and the buckle 13 drives the pressing piece 14 to limit and fix the test piece 5, which is conducive to the rapid installation and removal of the test piece 5 while ensuring the accuracy of the test data; S6, when the test piece 5 is fixed and stable, the actuator 7 is started to drive the mounting seat 10 to generate an alternating load on the test piece 5, and the fatigue verification of the test piece 5 is achieved by continuously loading the alternating load; In S1, when cutting the specimen 5, 1 / 3 of the total length of the front pressure rod 23 in the length direction and the width direction is selected. The selection principle is determined according to the bearing capacity of the complete section of the front pressure rod 23 and the capacity of the test bench. For example, if the bearing capacity of the complete section is 1000KN and the capacity of the test bench is 400KN, then only 400 / 1000=1 / 2.5 is needed, and the test bench can meet the requirements. Considering the margin, 1 / 3 is taken, and the section opposite to the side of the length and width of the complete section is translated to form a closed cut section, thereby forming the specimen 5 as a fatigue test node.
[0026] The above method can effectively select the specimen 5 in the best area for fatigue testing, which is convenient for obtaining accurate fatigue test data and improving the installation and disassembly efficiency of 05, thereby increasing the fluency and practicality of the device.
[0027] The use process of a crane turntable fatigue test device and test method provided by the present invention is as follows: Working principle: by selecting the position where the front pressure rod 23 and the turntable 22 are connected to each other for cutting, and making the specimen 5 as the fatigue test node, the specimen 5 is placed between the bottom pad 6 and the mounting seat 10, and then the screw rod 12 and the threaded sleeve 11 are rotated to slide and connect according to the position of the top of the specimen 5, so that the screw rod 12 is inside the top of the specimen 5, and then the longitude rotation buckle 13 drives the screw rod 12 and the threaded sleeve 11 to rotate, and the buckle 13 drives the pressure piece 14 to adjust according to the thickness of the top of the specimen 5. When the pressure piece 14 is adjusted to fit the specimen 5, the latitude rotation buckle 13 squeezes the pressure piece 14, so that the pressure piece 14 applies pressure to resist the top of the specimen 5, so as to fix and limit the top of the specimen 5; When the buckle 13 and the pressing piece 14 fix the flange 24 at the top of the test piece 5, the electric push rod 15 is then started to drive the driving seat 20 to move upward, and the driving seat 20 drives the driving block 18 to squeeze the rotating block 17, and the rotating block 17 rotates along the connection with the bottom pad 6, and the rotating block 17 drives the limiting block 16 to move in the direction of the test piece 5. At this time, one end of the limiting block 16 effectively resists the contact with the test piece 5, so that one end of the limiting block 16 can limit and fix the bottom end of the test piece 5; When the test piece 5 is completely limited and fixed in the above process, the actuator 7 is started to drive the mounting seat 10 to apply alternating load to the test piece 5, so that the actuator 7 performs a fatigue test on the test piece 5.
[0028] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.
Claims
1. A crane turntable fatigue test device, characterized in that: The invention comprises an operating base (1) and a test piece (5), wherein the test piece (5) is arranged at the top of the operating base (1), and columns (2) are fixed at both ends of the top of the operating base (1), and an adjusting block (3) is slidably connected to the top of the column (2), and a supporting top seat (4) is fixed at the top of the adjusting block (3), and an actuator (7) is installed at the bottom of the supporting top seat (4), and a mounting seat (10) is fixed at the output end of the actuator (7), and positioning mechanisms for fixing the top of the test piece (5) are arranged at both ends of the mounting seat (10), and a bottom pad (6) is fixed at the top of the operating base (1), and clamping mechanisms for fixing the bottom of the test piece (5) are arranged at both ends of the bottom pad (6).
2. A crane turntable fatigue test device according to claim 1, characterized in that: The positioning mechanism comprises a threaded sleeve (11), a screw rod (12), a buckle (13) and a pressure plate (14); both ends of the interior of the mounting seat (10) are provided with rectangular mounting grooves; the inner side of the mounting groove is rotatably connected to the threaded sleeve (11); the inner thread of the threaded sleeve (11) is connected to the screw rod (12); one end of the screw rod (12) away from the threaded sleeve (11) is rotatably connected to the buckle (13); the outer side of the screw rod (12) is sleeved with a pressure plate (14); the buckle (13) is slidably connected to the pressure plate (14).
3. A crane turntable fatigue test device according to claim 2, characterized in that: The outer side of the screw rod (12) is slidably connected to the top of the test piece (5), the top end of the pressure plate (14) resists the test piece (5), and the connection point between the screw rod (12) and the buckle (13) is eccentric to the center of the buckle (13).
4. A crane turntable fatigue test device according to claim 2, characterized in that: The clamping mechanism comprises an electric push rod (15), a limit block (16), a rotating block (17), a driving block (18), a limit block (19) and a driving seat (20); rectangular grooves are provided at both ends of the bottom pad (6); the inner side of the rectangular groove is rotatably connected to the rotating block (17); the top end of the rotating block (17) is rotatably connected to the limit block (16); one end of the limit block (16) is rotatably connected to the limit block (19); one end of the limit block (19) away from the limit block (16) is rotatably connected to the driving seat (20); one end of the driving seat (20) is rotatably connected to the driving block (18); and one end of the driving block (18) away from the driving seat (20) is rotatably connected to the center of the rotating block (17).
5. A crane turntable fatigue test device according to claim 4, characterized in that: Electric push rods (15) are mounted at both ends of the operating base (1), the output end of the electric push rod (15) is fixed to the driving seat (20), and the other end of the limit clamping block (16) is clamped to the bottom end of the test piece (5).
6. A crane turntable fatigue test device according to claim 2, characterized in that: A limit assembly is provided at one end of the two columns (2) that are away from each other, the limit assembly comprising a U-shaped limit block (8) and a latch (9), a plurality of limit slots are provided inside the adjustment block (3), a U-shaped limit block (8) is fixed to one end of the column (2), a latch (9) is slidably connected inside the U-shaped limit block (8), and one end of the latch (9) is slidably connected to the corresponding limit slot.
7. The crane turntable fatigue test device according to claim 1, characterized in that: It also includes a turntable (22), one end of the top of the turntable (22) is welded with a rear pull rod (21), the other end of the top of the turntable (22) is welded with a front pressure rod (23), the top of the rear pull rod (21) and the front pressure rod (23) are connected by welding, and the front pressure rod (23) and the rear pull rod (21) adopt a box-type structure.
8. A crane turntable fatigue test device according to claim 7, characterized in that: Flanges (24) are welded to the top and bottom of the test piece (5), reinforcing ribs (25) are welded to both sides of the top and bottom of the test piece (5), and the reinforcing ribs (25) are welded to the flanges (24).
9. A crane turntable fatigue test method, characterized in that: A crane turntable fatigue test device comprising any one of claims 1 to 8, comprising the following steps: S1, cutting the position where the front pressure rod (23) and the turntable (22) are connected, and producing a test piece (5) as a fatigue test node; S2, the top and bottom ends of the test piece (5) are welded to the flange (24) and the reinforcing rib (25) respectively; S3, placing the test piece (5) between the base pad (6) and the mounting seat (10); S4, starting the electric push rods (15) at both ends of the operating base (1) to drive the limit blocks (16) to fix the bottom end of the test piece (5); S5, driving the mounting seat (10) to contact the top of the test piece (5) through the output end of the actuator (7), and then rotating the screw rod (12) to engage with the top of the test piece (5); S6. When the test piece (5) is fixed and stabilized, the actuator (7) is started to drive the mounting seat (10) to generate an alternating load on the test piece (5).
10. A crane turntable fatigue test method according to claim 9, characterized in that: In S1, when cutting the test piece (5), 1 / 3 of the total length of the front pressure rod (23) in the length direction and the width direction is selected, and the selection principle is determined according to the bearing capacity of the complete cross section of the front pressure rod (23) and the capacity of the test bench.