Steel casting node multi-working-condition load test system and method

Abstract

The invention provides a steel casting node multi-working-condition load test system and method, and belongs to the technical field of steel structure performance tests.The steel casting node multi-working-condition load test system comprises a reaction frame, a fixing seat and a supporting device located in the reaction frame and further comprises a loading mechanism and a guiding mechanism; through running fit of the first driving motor and the second driving motor, the loading mechanism can move on the inner gear ring and the arc-shaped supporting plate, the loading mechanism can move at multiple angles, mechanical performance detection can be carried out on multi-dimensional steel casting nodes, and the detection effect of the test system is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of steel structure performance testing, and in particular relates to a multi-working condition load testing system and method for steel casting nodes. Background Art

[0002] Cast steel nodes are core components of long-span truss structures, typically constructed from integrally cast steel. They offer advantages such as simple construction, high load-bearing capacity, a wide variety of styles, and aesthetically pleasing appearance. They address the technical challenges of traditional welded ball joints, plate joints, and intersecting joints, including complex construction, cumbersome construction, unclear joint forces, and high weld residual stresses. They can meet both structural and architectural design requirements and have become the preferred form of joint for complex long-span spatial structures. Prior to use, stress testing is required at key locations on cast steel nodes.

[0003] Chinese patent application number 201110454356.9 discloses a spherical omnidirectional loading device for testing building structure nodes, including a spherical steel structure reaction frame, a loading positioning and adjustment wheel-rail system, a jack hydraulic servo loading system and a main console; the invention uses wheels and rails for spatial loading positioning, and combines hydraulic control loading technology with data acquisition technology to achieve spatial omnidirectional loading and data acquisition of node specimens; the invention is applicable to the spatial omnidirectional loading requirements of all different types of building structure nodes, and there is no need to process specific auxiliary components according to each node test, and the device can be reused for a long time.

[0004] However, in actual engineering, different projects use different steel structure nodes. The stress forms of cast steel nodes are complex and changeable, and the directions of stress are also different. Devices similar to the above are not convenient for fine-tuning the direction of the load, and it is difficult to realize the mechanical performance testing of multi-dimensional steel structure nodes; and there is a lack of protection measures for the loading mechanism when applying the load, which is not conducive to extending the life of the device.

[0005] Therefore, in order to solve the above problems, it is necessary to provide a multi-condition load testing system and method for steel casting nodes. Summary of the Invention

[0006] The purpose of the present invention is to provide a multi-working condition load test system for steel casting nodes, aiming to solve the problem that the stress forms of steel casting nodes in actual projects are complex and changeable, the steel structure nodes used in different projects are also different, and it is difficult to perform mechanical performance testing on multi-dimensional steel structure nodes in actual projects, as well as how to ensure the load loading life.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A multi-condition load test system for steel casting nodes includes a reaction frame, a fixing seat, and a support device disposed inside the reaction frame, and further includes:

[0009] A loading mechanism, wherein a plurality of loading mechanisms are provided and all are arranged inside the reaction frame, and are used to pressurize the pipes of the steel cast node;

[0010] A guide mechanism, the guide mechanism being arranged inside the reaction frame;

[0011] There are multiple driving mechanisms, each of which is arranged on the guide mechanism and connected to each loading mechanism. The driving mechanism is used to move the loading mechanism on the guide mechanism.

[0012] Preferably, the reaction frame is hemispherical, the guide mechanism includes a first guide groove arranged in an annular shape and opened on the inner wall of the reaction frame, the inner wall of the reaction frame is fixedly connected to an inner gear ring, a plurality of equally spaced arc-shaped support plates are provided inside the reaction frame, a second guide groove arranged in an arc-shape is opened on the inner side of each of the arc-shaped support plates, each of the second guide grooves is connected to the first guide groove, and an inner rack arranged in an arc-shape is fixedly connected to the inner side of each of the arc-shaped support plates.

[0013] Preferably, the driving mechanism includes a movable part that is slidably connected to the inner wall of the reaction frame, and each of the movable parts is fixedly connected to a limit part that is slidably connected to the first guide groove and the second guide groove on a side away from the supporting device. A first mounting groove is provided on the top of each movable part, and a first movable part is slidably connected to the inside of each first mounting groove. Each first movable part is provided with a first driving motor, and a driving end of each first driving motor is fixedly connected to a first gear that meshes with the inner gear ring. A first elastic part is connected between one side of each first movable part and the inner wall of the corresponding first mounting groove.

[0014] Preferably, a second mounting groove is provided at the bottom of each movable part, a second movable part is slidably connected to the inside of each second mounting groove, a second driving motor is provided on each second movable part, a driving end of each second driving motor is fixedly connected to a second gear meshing with the inner rack, and a second elastic part is connected between one side of each second movable part and the inner wall of the corresponding second mounting groove.

[0015] Preferably, the loading mechanism includes a first pressure sensor arranged on the side of each movable part away from the limit part, and each first pressure sensor is fixedly connected to a jack on the side away from the movable part. Driving the first drive motor can rotate the first gear, and can enable the movable part to drive the jack to move in a circular manner inside the reaction frame. When the loading mechanism moves to the position of the arc support plate, driving the second drive motor can rotate the second gear, and can enable the movable part to drive the jack to move on the arc support plate. An avoidance groove is provided on the side of each movable part close to the reaction frame, which is used to avoid the inner gear ring and the inner rack during the movement of the movable part.

[0016] Preferably, it also includes a clamping mechanism, which is arranged on each of the loading mechanisms and is used to clamp and fix the pipes of the steel cast nodes; the clamping mechanism includes a fixing part fixedly connected to the telescopic end of each of the jacks, and a rotation groove and a receiving groove are provided inside each of the fixing parts, and a limiting ring is provided inside each of the rotation grooves and is rotatably connected to the corresponding fixing part, and a coil spring is provided inside each of the receiving grooves, and the two ends of the coil spring are respectively fixedly connected to the corresponding fixing part and the limiting ring, and each of the limiting rings is provided with four first limiting grooves equidistantly distributed around the circumference, and each of the fixing parts is provided with a second limiting groove with the same number and corresponding position as the first limiting grooves on the side away from the jack, and each of the second limiting grooves is slidably connected to a clamping claw slidably connected to the corresponding first limiting groove.

[0017] Preferably, the inner side of the top of each of the clamps is wedge-shaped, the inner side of the bottom of each of the clamps is provided with a second pressure sensor, and each of the first limit grooves is arranged in an arc shape. When the pipe of the steel cast node contacts the inner wedge surfaces of the multiple clamps on the fixing part, it can push the multiple clamps on the fixing part to move synchronously.

[0018] Preferably, it also includes an adjustment mechanism, which is arranged inside each of the driving mechanisms and is used to adjust the position of the loading mechanism. The adjustment mechanism includes a slide groove opened inside each of the movable parts and a sealed cavity corresponding to the same number and position of the clamping jaws. The inside of each of the slide grooves is movably connected with an adjustment part, the outside of each of the adjustment parts is fixedly connected with a guide rail with the same number and corresponding position as the sealed cavity, the inside of each of the sealed cavities is slidably connected with a piston plate, each of the piston plates is fixedly connected with a connecting part slidably connected to the corresponding guide rail, each of the connecting parts is slidably connected to the corresponding movable part, each of the sealed cavities and the corresponding piston plate is filled with gas, and the side of each adjustment part extending out of the slide groove is connected to the corresponding first pressure sensor.

[0019] Preferably, the supporting device includes a third drive motor arranged at the bottom of the reaction frame, the output end of the third drive motor is fixedly connected to a pneumatic chuck, the pneumatic chuck is located inside the reaction frame, and the connection between the bottom of the reaction frame and the arc-shaped support plate is provided with photoelectric sensors with the same number and corresponding positions as the arc-shaped support plates.

[0020] The multi-condition load test method for steel casting nodes includes the following steps:

[0021] S1: Place the steel casting node to be tested on the supporting device;

[0022] S2: Control the first drive motor and the second drive motor to rotate, so that the multiple loading mechanisms move to the test position and the support position respectively, and detect the steel casting nodes;

[0023] S3: Change the test position, give priority to controlling the loading mechanism close to the test position to move and position, and then control the loading mechanism close to the support position to move and position in turn.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention can realize the movement of the loading mechanism on the inner gear ring and the arc-shaped support plate through the rotational cooperation of the first drive motor and the second drive motor. The loading mechanism can move at multiple angles and can detect the mechanical properties of steel casting nodes in multiple dimensions, thereby improving the detection effect of the detection system.

[0026] 2. The present invention sets a first movable member and a second movable member. When the first gear and the inner gear ring are squeezed, the first movable member will move toward the jack inside the first mounting groove, and the first elastic member will be compressed to avoid hard contact between the first gear and the inner gear ring. When the second gear and the inner rack are squeezed, the second movable member will move toward the first mounting groove inside the second mounting groove to avoid hard contact between the second gear and the inner rack. Therefore, through the movement of the first movable member and the second movable member, the damage caused by the reaction force of the loading mechanism to the first gear, the inner gear ring, the second gear and the inner rack can be reduced, and the service life can be improved.

[0027] 3. The present invention adopts the arrangement of a support device. When the required photoelectric sensor does not detect the pipe rod corresponding to the steel-cast node, the pneumatic chuck drives the steel-cast node for rotational adjustment by driving the third drive motor. When all the required photoelectric sensors detect the pipe rod corresponding to the steel-cast node, the third drive motor stops rotating, thereby achieving adjustment of the steel-cast node and ensuring that the loading mechanism can correspond to the pipe rod of the steel-cast node during movement on the arc-shaped support plate, reducing manual operation and improving detection efficiency.

[0028] 4. The present invention sets a clamping mechanism and an adjusting mechanism. When the pipe of the steel-cast node and the loading mechanism are not on the same axis and are skewed, the clamping claw that preferentially contacts the steel-cast node pipe can use the reaction force to make the adjusting part drive the corresponding connecting part and the piston plate to move inside the corresponding sealing cavity, thereby adjusting the position of the jack, avoiding uneven force on the clamping claw on the corresponding fixing part when contacting the pipe of the steel-cast node, resulting in wear and deformation of the clamping claw, and improving the service life. When the data detected by the four second pressure sensors on the corresponding fixing part are different, the first drive motor or the second drive motor should be driven according to the force situation to adjust the position of the corresponding loading mechanism, so that the pipe of the steel-cast node and the jack remain coaxial, thereby improving the accuracy of the detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0032] Figure 2 This is a schematic diagram of loading of the steel cast node of the present invention.

[0033] Figure 3 It is a cross-sectional view of the overall structure of the present invention.

[0034] Figure 4 For the present invention Figure 3 A magnified view of the structure of part A.

[0035] Figure 5 This is a partial structural cross-sectional view of the first guide groove of the present invention.

[0036] Figure 6 It is a schematic diagram of the driving mechanism structure of the present invention.

[0037] Figure 7 This is a cross-sectional view of the internal structure of the second mounting groove of the present invention.

[0038] Figure 8 It is a partial structural diagram of the first moving part of the present invention.

[0039] Figure 9 It is a cross-sectional view of the internal structure of the movable part of the present invention.

[0040] Figure 10 Exploded view of the clamping mechanism of the present invention.

[0041] Figure 11 It is a partial cross-sectional view of the internal structure of the fixing member of the present invention.

[0042] Figure 12 It is a cross-sectional view of the adjustment mechanism structure of the present invention.

[0043] Figure 13 This is a schematic diagram of the cooperation between the guide rail and the connecting piece of the present invention.

[0044] Figure 14 Schematic diagram of the steel cast node of the present invention.

[0045] The accompanying drawings are marked as follows: 1. reaction frame; 2. fixing seat; 3. supporting device; 31. third driving motor; 32. pneumatic chuck; 33. photoelectric sensor; 4. loading mechanism; 41. first pressure sensor; 42. jack; 5. guide mechanism; 51. first guide groove; 52. inner gear ring; 53. arc-shaped support plate; 54. second guide groove; 55. inner rack; 6. driving mechanism; 61. movable part; 62. limiting part; 63. first mounting groove; 64. first moving part; 65. first driving motor; 66. first gear; 67. First elastic member; 68, second mounting groove; 69, second movable member; 610, second drive motor; 611, second gear; 612, second elastic member; 613, avoidance groove; 7, clamping mechanism; 71, fixing member; 72, rotating groove; 73, accommodating groove; 74, limiting ring; 75, coil spring; 76, first limiting groove; 77, second limiting groove; 78, clamping claw; 79, second pressure sensor; 8, adjusting mechanism; 81, slide groove; 82, sealing chamber; 83, adjusting member; 84, guide rail; 85, piston plate; 86, connecting member. DETAILED DESCRIPTION

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] Example 1

[0048] In actual projects, the stress forms of steel cast nodes are complex and changeable, and the steel structure nodes used in different projects are also different. Existing testing equipment is difficult to test the mechanical properties of multi-dimensional steel structure nodes in actual projects.

[0049] See also Figures 1-9 The present invention provides the following technical solution: a multi-working-condition load test system for steel casting nodes, comprising a reaction frame 1, a fixing seat 2, and a supporting device 3 disposed inside the reaction frame 1, and further comprising:

[0050] The loading mechanism 4 is provided in plurality and all are arranged inside the reaction frame 1 , and is used to pressurize the pipes of the steel casting node.

[0051] The guide mechanism 5 is arranged inside the reaction frame 1. The guide mechanism 5 is provided with multiple driving mechanisms 6 connected to each loading mechanism 4. The driving mechanism 6 is used to move the loading mechanism 4 on the guide mechanism 5 and adjust the position of the loading mechanism 4.

[0052] The clamping mechanism 7 is provided on each loading mechanism 4 and is used to clamp and fix the pipe of the steel casting node.

[0053] The adjusting mechanism 8 is arranged inside each driving mechanism 6 and is used to cooperate with the clamping mechanism 7 to adjust the position of the loading mechanism 4 on the driving mechanism 6.

[0054] The supporting device 3 is used to support the bottom pipe of the steel casting node. The multi-working condition load test system for the steel casting node also includes a strain gauge, a strain recorder, and a high-speed imaging device. The strain gauge is used to detect the deformation of the steel casting node, the strain recorder is used to record the deformation data, and the high-speed imaging device is used to record the deformation process. All of these are existing technologies and will not be described in detail.

[0055] The reaction frame 1 is hemispherical in shape, and the guide mechanism 5 includes a first guide groove 51 which is annularly arranged on the inner wall of the reaction frame 1. An inner gear ring 52 is fixedly connected to the inner wall of the reaction frame 1. A plurality of equally spaced arc-shaped support plates 53 are provided inside the reaction frame 1. A second guide groove 54 which is arc-shaped is provided on the inner side of each arc-shaped support plate 53. Each second guide groove 54 is connected to the first guide groove 51. An inner rack 55 which is arc-shaped is fixedly connected to the inner side of each arc-shaped support plate 53.

[0056] The driving mechanism 6 includes a plurality of movable parts 61 that are slidably connected to the inner wall of the reaction frame 1, and each movable part 61 is fixedly connected to a limit part 62 that is slidably connected to the first guide groove 51 and the second guide groove 54 on the side away from the support device 3; a first mounting groove 63 is provided at the top of each movable part 61, and a first driving motor 65 is provided inside each first mounting groove 63, and the driving end of each first driving motor 65 is fixedly connected to a first gear 66 that meshes with the inner gear ring 52; a second mounting groove 68 is provided at the bottom of each movable part 61, and a second driving motor 610 is provided inside each second mounting groove 68, and the driving end of each second driving motor 610 is fixedly connected to a second gear 611 that meshes with the inner rack 55.

[0057] The loading mechanism 4 includes a first pressure sensor 41 provided on a side of each movable member 61 away from the limiting member 62 . A jack 42 is fixedly connected to a side of each first pressure sensor 41 away from the movable member 61 .

[0058] The first pressure sensor 41 is used to detect stress changes in the steel casting node, which is an existing technology and will not be described in detail.

[0059] Driving the first drive motor 65 can rotate the first gear 66, which can enable the movable part 61 to drive the jack 42 to move in a circular manner inside the reaction frame 1. Controlling the first drive motor 65 to rotate forward and reverse can enable the movable part 61 to drive the jack 42 to move back and forth on the inner gear ring 52.

[0060] When the loading mechanism 4 moves to the position of the arc-shaped support plate 53, driving the second drive motor 610 can rotate the second gear 611, so that the movable part 61 can drive the jack 42 to move on the arc-shaped support plate 53; controlling the second drive motor 610 to rotate forward and reverse can cause the movable part 61 to drive the jack 42 to move back and forth on the arc-shaped support plate 53.

[0061] The first driving motor 65 and the second driving motor 610 are both electrically connected to a controller, and the rotation of the first driving motor 65 and the second driving motor 610 is controlled by the controller.

[0062] The number of movable parts 61 is the same as the number of jacks 42 , and is at least four.

[0063] The number of arc-shaped support plates 53 can be increased according to actual needs. When the number of arc-shaped support plates 53 increases, the moving range of the loading mechanism 4 can be increased.

[0064] The four loading mechanisms 4 can provide fixed support for the steel casting node by cooperating with the supporting device 3. At this time, three loading mechanisms 4 only provide supporting pressure, and the other loading mechanism 4 performs a static loading test.

[0065] In actual use, the steel casting node that needs to be inspected is placed on the supporting device 3, and then the first driving motor 65 and the second driving motor 610 are driven to rotate so that the movable part 61 drives the jack 42 to move to the position of the supporting pipe and the inspection pipe on the steel casting node, ensuring one inspection point and multiple support points, that is, four loading mechanisms 4. It is necessary to ensure that one loading mechanism 4 is used for pressure detection and three loading mechanisms 4 are used for support. Therefore, through the rotation of the first driving motor 65 and the second driving motor 610, the positions of multiple loading mechanisms 4 can be moved, and the mechanical properties of multi-dimensional steel casting nodes can be tested.

[0066] The present invention can realize the movement of the loading mechanism 4 on the inner gear ring 52 and the arc-shaped support plate 53 through the rotational cooperation of the first drive motor 65 and the second drive motor 610. The loading mechanism 4 can move at multiple angles and can test the mechanical properties of steel casting nodes in multiple dimensions, thereby improving the detection effect of the test system.

[0067] Example 2

[0068] Based on the above embodiment, when a load is applied to the steel cast node, the reaction force of the loading mechanism will damage the inner gear ring, causing damage to the gear and track. After a long time, it will affect the movement effect of the loading mechanism and reduce the service life. For this reason, the following improvements are made.

[0069] See also Figure 4-Figure 9 A first movable member 64 is slidably connected to the interior of each first mounting groove 63 , a first driving motor 65 is provided on each first movable member 64 , and a first elastic member 67 is connected between one side of each first movable member 64 and the inner wall of the corresponding first mounting groove 63 .

[0070] A second moving member 69 is slidably connected to the interior of each second mounting slot 68 , and a second driving motor 610 is provided on each second moving member 69 . A second elastic member 612 is connected between one side of each second moving member 69 and the inner wall of the corresponding second mounting slot 68 .

[0071] Each movable part 61 is provided with an avoidance groove 613 on one side close to the reaction frame 1 , which is used to avoid the inner gear ring 52 and the inner rack 55 during the movement of the movable part 61 , thereby preventing the movable part 61 from directly contacting the inner gear ring 52 and the inner rack 55 .

[0072] When the loading mechanism 4 moves on the inner gear ring 52, the movable part 61 can contact the inner wall of the reaction frame 1 while avoiding the inner gear ring 52. When the loading mechanism 4 moves on the arc-shaped support plate 53, one side of the movable part 61 can contact the arc-shaped support plate 53 while the other side avoids the inner rack 55.

[0073] It should be noted that when the loading mechanism 4 is used for a long time, the reaction force of the loading mechanism 4 will act on the inner wall of the reaction frame 1 or the arc-shaped support plate 53. Long-term use will cause the inner wall of the reaction frame 1 or the arc-shaped support plate 53 to deform, resulting in the first gear 66 and the inner gear ring 52 being squeezed, and the second gear 611 and the inner rack 55 being squeezed, which may easily cause damage to the first gear 66, the inner gear ring 52, the second gear 611 and the inner rack 55, affecting the subsequent movement of the loading mechanism 4. For this purpose, a first moving member 64 and a second moving member 69 are provided. When the first gear 66 and the inner gear ring 52 are squeezed, the first moving member 64 will move in the direction of the jack 42 inside the first mounting groove 63, and the first elastic member 67 is compressed, thereby avoiding hard contact between the first gear 66 and the inner gear ring 52. When the second gear 611 and the inner rack 55 are squeezed, the second moving member 69 will move in the direction of the first mounting groove 63 inside the second mounting groove 68, and the second elastic member 612 is compressed, thereby avoiding hard contact between the second gear 611 and the inner rack 55. Therefore, through the movement of the first moving member 64 and the second moving member 69, the damage caused by the reaction force of the loading mechanism 4 to the first gear 66, the inner gear ring 52, the second gear 611 and the inner rack 55 can be reduced, and the service life can be improved.

[0074] The present invention sets a first moving member 64 and a second moving member 69. When the first gear 66 and the inner gear ring 52 are squeezed, the first moving member 64 will move in the direction of the jack 42 inside the first mounting groove 63, and the first elastic member 67 will be compressed to avoid hard contact between the first gear 66 and the inner gear ring 52. When the second gear 611 and the inner rack 55 are squeezed, the second moving member 69 will move in the direction of the first mounting groove 63 inside the second mounting groove 68 to avoid hard contact between the second gear 611 and the inner rack 55. Therefore, through the movement of the first moving member 64 and the second moving member 69, the second elastic member 612 is compressed, which can reduce the damage caused by the reaction force of the loading mechanism 4 to the first gear 66, the inner gear ring 52, the second gear 611 and the inner rack 55, and can improve the service life.

[0075] Example 3

[0076] The multi-working condition detection method for steel casting nodes includes the following steps:

[0077] S1: Place the steel casting node to be tested on the support device 3;

[0078] S2: Control the first drive motor 65 and the second drive motor 610 to rotate, so that the multiple loading mechanisms 4 move to the test position and the support position respectively, and detect the steel casting nodes;

[0079] S3: Changing the test position, preferentially controlling the loading mechanism 4 close to the test position to move and position, and then sequentially controlling the loading mechanism 4 close to the support position to move and position.

[0080] It should be noted that, for example, when performing multi-dimensional stress testing on steel casting nodes, Figure 2 and Figure 14 As shown, the pipe at the bottom of the steel casting node is placed on the supporting device 3 inside the testing device, the steel casting node is fixed first, and the pipes a, e, c, and g on the steel casting node are loaded and fixed by four loading mechanisms 4, and the node position of the steel casting node is determined to be the initial position (0, 0, 0). At this time, the four loading mechanisms 4 are respectively located at (g, 0, 0) (-c, 0, 0) (0, e, 0) and (0, -a, 0). At this time, the four loading mechanisms 4 can perform loading stress experiments on the pipes a, e, c, and g on the steel casting node in turn. When testing the pipe a on the steel casting node, the loading mechanisms 4 corresponding to the pipes e, c, and g on the steel casting node are in a fixed state, that is, only providing pressure to fix the steel casting node, ensuring that three loading mechanisms 4 support the steel casting node and one loading mechanism 4 applies pressure to the steel casting node for testing.

[0081] When inspecting other pipes on the steel-cast node, it is necessary to change the position of the loading mechanism 4. For example, when inspecting pipe f on the steel-cast node, the four loading mechanisms 4 will gradually move from the initial position. Since the loading mechanism 4 corresponding to pipe g is closest to pipe f, it is necessary to first control the loading mechanism 4 corresponding to pipe g to move on the inner gear ring 52 toward pipe f, move to the position of pipe f, and pressurize and fix pipe f. Then, control the loading mechanism 4 corresponding to pipe a to move on the inner gear ring 52 toward pipe g, move to the position of pipe g, and pressurize and fix pipe g. Then, control the loading mechanism 4 corresponding to pipe c to move on the inner gear ring 52 toward pipe a, move to the position of pipe a, and pressurize and fix pipe a. Finally, control the loading mechanism 4 corresponding to pipe e to move on the inner gear ring 52 toward pipe c, move to the position of pipe c, and pressurize and fix pipe c. At this time, the loading mechanism 4 can perform a loading stress test on pipe f on the steel-cast node.

[0082] When inspecting other pipelines in the steel-cast node, that is, when changing the position of the loading mechanism 4, it is necessary to determine the position of the supporting pipeline by analyzing the stress conditions of the inspected pipeline in the steel-cast node. Then, when the loading mechanism 4 is moved, it is necessary to move one by one. The loading mechanism 4 close to the test pipeline needs to be moved first, and then the loading mechanism 4 close to the supporting pipeline needs to be moved in sequence to ensure that there are always three loading mechanisms 4 supporting the steel-cast node. The movement of the loading mechanism 4 adopts a proximity method. The loading mechanism 4 close to the inspection pipeline moves first, and the loading mechanism 4 close to the supporting pipeline moves later. During the movement of the loading mechanism 4, position interference between the loading mechanisms 4 needs to be avoided.

[0083] The information of each pipe member of the actual test steel casting node is shown in Table 1:

[0084] Table 1

[0085]

[0086] In actual loading and testing of the pipe members of the steel-cast node, the loading mechanism 4 needs to first load and fix the pipes of the steel-cast node and determine the initial position of the steel-cast node. When the detection position of the loading mechanism 4 needs to be changed, it can be positioned and moved according to the coordinate position of the steel-cast node pipe member in Table 1.

[0087] Example 4

[0088] When clamping and fixing the steel cast node, it is necessary to ensure that each pipe rod of the steel cast node corresponds to multiple arc support plates to avoid the loading mechanism being unable to correspond to each pipe rod of the steel cast node during movement on the arc support plate, requiring manual rotation and adjustment of the steel cast node, which affects the detection efficiency.

[0089] like Figure 2-Figure 5 As shown, the support device 3 includes a third drive motor 31 provided at the bottom of the reaction frame 1, and the output end of the third drive motor 31 is fixedly connected to the pneumatic chuck 32, which is located inside the reaction frame 1. The connection between the bottom of the reaction frame 1 and the arc-shaped support plate 53 is provided with photoelectric sensors 33 of the same number and corresponding positions as the arc-shaped support plate 53. The photoelectric sensors 33 are used to detect whether the positions of the pipe rods of the steel casting node correspond to the arc-shaped support plate 53. The third drive motor 31 and the photoelectric sensors 33 are both electrically connected to the controller. The pneumatic chuck 32 is a prior art and will not be described in detail here.

[0090] During use, the number and position of the photoelectric sensors 33 and arc-shaped support plates 53 to be used can be determined according to the different shapes of the steel casting nodes, and the photoelectric sensors 33 can be used to detect the correspondence between the pipe rods of the steel casting nodes and the arc-shaped support plates 53.

[0091] The number and position of the photoelectric sensors 33 and the arc-shaped support plates 53 can be set according to actual conditions. For example, when the number of the arc-shaped support plates 53 is set to 8, the pipes with steel-cast nodes in the directions of angles of 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°, and 360° can be detected. When the number of the arc-shaped support plates 53 is set to 6, the pipes with steel-cast nodes in the directions of angles of 0°, 60°, 120°, 180°, 240°, 300°, and 360° can be detected.

[0092] During actual use, the steel-cast node to be inspected is placed on the supporting device 3, and the bottom pipe of the steel-cast node is clamped and fixed by the pneumatic chuck 32, and then detected by the photoelectric sensor 33. When the required photoelectric sensor 33 does not detect the pipe rod corresponding to the steel-cast node, the pneumatic chuck 32 drives the steel-cast node to rotate and adjust by driving the third drive motor 31. When all the photoelectric sensors 33 to be used detect the pipe rod corresponding to the steel-cast node, the third drive motor 31 stops rotating, thereby realizing the adjustment of the steel-cast node, ensuring that the loading mechanism 4 can correspond to the pipe rod of the steel-cast node during the movement on the arc-shaped support plate 53, reducing manual operation and improving detection efficiency.

[0093] The present invention is provided with a support device 3. When the required photoelectric sensor 33 does not detect the pipe rod corresponding to the steel-cast node, the pneumatic chuck 32 drives the steel-cast node to rotate and adjust by driving the third drive motor 31. When all the photoelectric sensors 33 to be used detect the pipe rod corresponding to the steel-cast node, the third drive motor 31 stops rotating, thereby achieving adjustment of the steel-cast node and ensuring that the loading mechanism 4 can correspond to the pipe rod of the steel-cast node during the movement on the arc-shaped support plate 53, reducing manual operation and improving detection efficiency.

[0094] Example 5

[0095] When the loading mechanism loads and pressurizes the pipe members of the steel casting node, it needs to remain on the same axis as the pipe members of the steel casting node to avoid deviation between the loading mechanism and the pipes of the steel casting node, which will cause uneven force on the pipes of the steel casting node when pressurizing, affecting the accuracy of the detection.

[0096] like Figures 9-13As shown, the clamping mechanism 7 includes a fixing member 71 fixedly connected to the telescopic end of each jack 42, a rotation groove 72 and a receiving groove 73 are provided inside each fixing member 71, a limiting ring 74 rotatably connected to the corresponding fixing member 71 is provided inside each rotating groove 72, and a coil spring 75 is provided inside each receiving groove 73. The two ends of the coil spring 75 are respectively fixedly connected to the corresponding fixing member 71 and the limiting ring 74, and each limiting ring 74 is provided with four first limiting grooves 76 equidistantly distributed around the circumference. A second limiting groove 77 having the same number and corresponding position as the first limiting groove 76 is provided on the side of each fixing member 71 away from the jack 42, and a clamping claw 78 slidably connected to the corresponding first limiting groove 76 is slidably connected inside each second limiting groove 77.

[0097] The inner side of the top of each clamping jaw 78 is designed in a wedge shape, and the inner side of the bottom of each clamping jaw 78 is provided with a second pressure sensor 79. Each first limiting groove 76 is arranged in an arc shape. When the pipe of the steel cast node contacts the inner wedge surface of the multiple clamping jaws 78 on the fixing part 71, it can push the multiple clamping jaws 78 on the fixing part 71 to move synchronously.

[0098] The second pressure sensor 79 is electrically connected to the controller, and is used to detect the force applied to the clamping jaws 78 when clamping the steel cast node pipe.

[0099] The multiple claws 78 on the initial fixing part 71 approach each other under the action of the coil spring 75. When one of the multiple claws 78 on the corresponding fixing part 71 is subjected to force, it will move in the direction away from each other inside the second limiting groove 77 and the first limiting groove 76, and will push the limiting ring 74 to rotate, so that the other claws 78 on the corresponding fixing part 71 can move synchronously.

[0100] The adjusting mechanism 8 includes a slide groove 81 provided inside each movable part 61 and a sealed cavity 82 corresponding to the same number and position as the clamping jaws 78. The inside of each slide groove 81 is movably connected with an adjusting part 83. The outside of each adjusting part 83 is fixedly connected with a guide rail 84 which is the same number and corresponding to the sealed cavity 82. The inside of each sealed cavity 82 is slidably connected with a piston plate 85. Each piston plate 85 is fixedly connected with a connecting part 86 which is slidably connected to the corresponding guide rail 84. Each connecting part 86 is slidably connected to the corresponding movable part 61. Gas is filled between each sealed cavity 82 and the corresponding piston plate 85. The side of each adjusting part 83 extending out of the slide groove 81 is connected to the corresponding first pressure sensor 41.

[0101] In the initial state, the air pressure inside the sealing cavity 82 can ensure that the adjusting member 83 is at the center of the sliding groove 81 . When the adjusting member 83 moves inside the sliding groove 81 , it can drive the first pressure sensor 41 and the jack 42 to move synchronously.

[0102] During actual use, when the loading mechanism 4 fixes the pipe of the steel-cast node, the inner wedge surfaces of the multiple claws 78 on the fixing part 71 will preferentially contact the pipe of the steel-cast node. When the jack 42 applies pressure, that is, the pipe of the steel-cast node is inserted into the multiple claws 78 on the corresponding fixing part 71, the multiple claws 78 on the fixing part 71 are forced to move synchronously inside the second limit groove 77 and the first limit groove 76, and move away from each other. During this process, if the pipe of the steel-cast node and the loading mechanism 4 are not on the same axis and are skewed, the multiple claws 78 on the fixing part 71 will deviate from the pipe of the steel-cast node, resulting in uneven force on the multiple claws 78 on the corresponding fixing part 71 when contacting the pipe of the steel-cast node. Long-term use will cause the claws 78 to wear and deform.

[0103] It should be noted that when the pipe of the steel-cast node is not on the same axis as the loading mechanism 4 and there is a deviation, the multiple clamping claws 78 on the fixing member 71 will not be able to contact the pipe of the steel-cast node at the same time, resulting in a time difference when the clamping claws 78 on the corresponding fixing member 71 contact the pipe of the steel-cast node. Some clamping claws 78 will preferentially contact the pipe of the steel-cast node. Since the adjusting member 83 is movably connected inside the chute 81, the clamping claw 78 that preferentially contacts the pipe of the steel-cast node can drive the corresponding connecting member 86 and the piston plate 85 to move inside the corresponding sealing cavity 82 through the reaction force of the adjusting member 83, and squeeze the corresponding sealing member 86 and the piston plate 85. The gas inside the cavity 82, for example, when the right side clamping claw 78 on the corresponding fixing part 71 contacts the pipe of the steel cast node first, the adjusting part 83 drives the connecting part 86 and the piston plate 85 on the corresponding side to move inside the sealed cavity 82, and the adjusting part 83 moves to the right as a whole, so that the air pressure inside the sealed cavity 82 corresponding to the right side piston plate 85 is increased, and the air pressure inside the sealed cavity 82 corresponding to the left side piston plate 85 is weakened, thereby realizing the adjustment of the position of the jack 42 and performing buffering, avoiding uneven force on the clamping claw 78 on the corresponding fixing part 71 when contacting the pipe of the steel cast node, resulting in wear and deformation of the clamping claw 78, thereby improving the service life.

[0104] When the pipe of the steel-cast node is no longer in contact with the wedge surface of the clamp 78, that is, when the pipe of the steel-cast node is inserted into the inside of the clamp 78 on the corresponding fixing part 71, the four second pressure sensors 79 on the corresponding fixing part 71 can respectively detect the force conditions of each clamp 78 when clamping the steel-cast node pipe. When the data detected by the four second pressure sensors 79 on the corresponding fixing part 71 are different, the first drive motor 65 or the second drive motor 610 should be driven according to the force conditions to adjust the position of the corresponding loading mechanism 4, that is, move toward the side with greater pressure until the four second pressure sensors 79 on the corresponding fixing part 71 detect the same data.

[0105] In the process of driving the first drive motor 65 or the second drive motor 610 so that the detection data of the four second pressure sensors 79 on the corresponding fixed part 71 are the same, the internal pressure of the sealed cavity 82 on the corresponding movable part 61 will be reset, and the adjustment part 83 inside the slide groove 81 can be moved through the pressure to compensate for the deflection, so that the detection data of the four second pressure sensors 79 on the corresponding fixed part 71 are the same, ensuring that the pipeline of the steel cast node remains coaxial with the jack 42, thereby improving the accuracy of the detection results.

[0106] In actual use, when multiple loading mechanisms 4 cannot be aligned with the pipes of the steel casting node, it is necessary to first fix and clamp the pipes at the bottom of the steel casting node through the support device 3 to ensure that the steel casting node does not move. Then the four loading mechanisms 4 clamp and fix the pipes of the steel casting node in turn, and position them coaxially, thereby achieving the fixation of the steel casting node through the cooperation of the loading mechanism 4 and the support device 3.

[0107] The present invention is provided with a clamping mechanism 7 and an adjusting mechanism 8. When the pipe of the steel-cast node and the loading mechanism 4 are not on the same axis and are skewed, the clamping claw 78 that preferentially contacts the steel-cast node pipe can use the reaction force to make the adjusting member 83 drive the corresponding connecting member 86 and the piston plate 85 to move inside the corresponding sealing chamber 82, thereby adjusting the position of the jack 42, avoiding uneven force on the clamping claw 78 on the corresponding fixing member 71 when contacting the pipe of the steel-cast node, resulting in wear and deformation of the clamping claw 78, thereby improving the service life. When the data detected by the four second pressure sensors 79 on the corresponding fixing member 71 are different, the first drive motor 65 or the second drive motor 610 should be driven according to the force conditions to adjust the position of the corresponding loading mechanism 4, so that the pipe of the steel-cast node and the jack 42 remain coaxial, thereby improving the accuracy of the detection results.

[0108] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A multi-condition load test system for steel casting nodes, comprising a reaction frame (1), a fixing seat (2) and a supporting device (3) arranged inside the reaction frame (1), characterized in that: Also includes: A loading mechanism (4), wherein a plurality of loading mechanisms (4) are provided and all are arranged inside the reaction frame (1) and are used to pressurize the pipeline of the steel casting node; A guide mechanism (5), wherein the guide mechanism (5) is arranged inside the reaction frame (1); a driving mechanism (6), wherein a plurality of the driving mechanisms (6) are arranged on the guide mechanism (5) and connected to each of the loading mechanisms (4), and the driving mechanism (6) is used to move the loading mechanism (4) on the guide mechanism (5); A clamping mechanism (7), the clamping mechanism (7) being arranged on each of the loading mechanisms (4) and being used to clamp and fix the pipe of the steel casting node; An adjusting mechanism (8), wherein the adjusting mechanism (8) is arranged inside each of the driving mechanisms (6) and is used to cooperate with the clamping mechanism (7) to adjust the position of the loading mechanism (4) on the driving mechanism (6).

2. The steel casting node multi-condition load test system according to claim 1 is characterized in that: The reaction frame (1) is hemispherical in shape, the guide mechanism (5) comprises a first guide groove (51) which is formed on the inner wall of the reaction frame (1) and is arranged in an annular shape, the inner wall of the reaction frame (1) is fixedly connected with an inner toothed ring (52), a plurality of equally spaced arc-shaped support plates (53) are arranged inside the reaction frame (1), a second guide groove (54) which is arranged in an arc shape is formed on the inner side of each arc-shaped support plate (53), each second guide groove (54) is connected to the first guide groove (51), and an inner toothed rack (55) which is arranged in an arc shape is fixedly connected to the inner side of each arc-shaped support plate (53).

3. The steel casting node multi-condition load test system according to claim 2 is characterized in that: The driving mechanism (6) comprises a movable member (61) slidably connected to the inner wall of the reaction frame (1); a side of each movable member (61) away from the supporting device (3) is fixedly connected to a limiting member (62) slidably connected to the first guide groove (51) and the second guide groove (54); a first mounting groove (63) is provided on the top of each movable member (61); a first movable member (64) is slidably connected inside each first mounting groove (63); a first driving motor (65) is provided on each first movable member (64); a driving end of each first driving motor (65) is fixedly connected to a first gear (66) meshing with the inner gear ring (52); and a first elastic member (67) is connected between one side of each first movable member (64) and the inner wall of the corresponding first mounting groove (63).

4. The steel casting node multi-condition load test system according to claim 3 is characterized in that: A second mounting groove (68) is provided at the bottom of each movable member (61), a second movable member (69) is slidably connected inside each second mounting groove (68), a second driving motor (610) is provided on each second movable member (69), a driving end of each second driving motor (610) is fixedly connected to a second gear (611) meshing with the inner rack (55), and a second elastic member (612) is connected between one side of each second movable member (69) and the inner wall of the corresponding second mounting groove (68).

5. The steel casting node multi-condition load test system according to claim 4 is characterized in that: The loading mechanism (4) comprises a first pressure sensor (41) arranged on a side of each movable part (61) away from the limiting part (62); a jack (42) is fixedly connected to the side of each first pressure sensor (41) away from the movable part (61); driving the first drive motor (65) can rotate the first gear (66), so that the movable part (61) drives the jack (42) to move in a circular manner inside the reaction frame (1); when the loading mechanism (4) moves to the position of the arc-shaped support plate (53), driving the second drive motor (610) can rotate the second gear (611), so that the movable part (61) drives the jack (42) to move on the arc-shaped support plate (53); and a side of each movable part (61) close to the reaction frame (1) is provided with an avoidance groove (613) for avoiding the inner gear ring (52) and the inner gear rack (55) during the movement of the movable part (61).

6. The steel casting node multi-condition load test system according to claim 5 is characterized in that: The clamping mechanism (7) comprises a fixing member (71) fixedly connected to the telescopic end of each jack (42); a rotation groove (72) and a receiving groove (73) are provided inside each fixing member (71); a limiting ring (74) rotatably connected to the corresponding fixing member (71) is provided inside each rotating groove (72); a coil spring (75) is provided inside each receiving groove (73); two ends of the coil spring (75) are respectively fixedly connected to the corresponding fixing member (71) and the limiting ring (74); four first limiting grooves (76) equidistantly distributed on the circumference are provided on each limiting ring (74); a side of each fixing member (71) away from the jack (42) is provided with second limiting grooves (77) of the same number and corresponding position as the first limiting grooves (76); and a clamping claw (78) slidably connected to the corresponding first limiting groove (76) is slidably connected inside each second limiting groove (77).

7. The steel casting node multi-condition load test system according to claim 6 is characterized in that: The inner side of the top of each clamp (78) is designed in a wedge shape, the inner side of the bottom of each clamp (78) is provided with a second pressure sensor (79), and each of the first limiting grooves (76) is arranged in an arc shape. When the pipe of the steel casting node contacts the inner wedge surface of the multiple clamps (78) on the fixing member (71), the multiple clamps (78) on the fixing member (71) can be pushed to move synchronously.

8. The steel casting node multi-condition load test system according to claim 7 is characterized in that: The regulating mechanism (8) comprises a slide groove (81) provided inside each movable part (61) and a sealing cavity (82) having the same number and position corresponding to the clamping jaws (78); the inside of each slide groove (81) is movably connected with an regulating part (83); the outer side of each regulating part (83) is fixedly connected with a guide rail (84) having the same number and position corresponding to the sealing cavity (82); the inside of each sealing cavity (82) is slidably connected with a piston plate (85); each piston plate (85) is fixedly connected with a connecting part (86) slidably connected to the corresponding guide rail (84); each connecting part (86) is slidably connected to the corresponding movable part (61); gas is filled between each sealing cavity (82) and the corresponding piston plate (85); and one side of each regulating part (83) extending out of the slide groove (81) is connected to the corresponding first pressure sensor (41).

9. The steel casting node multi-condition load test system according to claim 8, characterized in that: The support device (3) comprises a third drive motor (31) arranged at the bottom of the reaction frame (1); an output end of the third drive motor (31) is fixedly connected to a pneumatic chuck (32); the pneumatic chuck (32) is located inside the reaction frame (1); and photoelectric sensors (33) of the same number and corresponding positions as the arcuate support plate (53) are arranged at the connection between the bottom of the reaction frame (1) and the arcuate support plate (53).

10. A multi-condition load test method for steel casting nodes, the test method adopts the multi-condition load test system for steel casting nodes according to claim 9, characterized in that: The following steps are involved: S1: placing the steel casting node to be inspected on the supporting device (3); S2: Controlling the first drive motor (65) and the second drive motor (610) to rotate, so that the plurality of loading mechanisms (4) are moved to the test position and the support position respectively, and the steel casting nodes are tested; S3: changing the test position, preferentially controlling the loading mechanism (4) close to the test position to move and position, and then sequentially controlling the loading mechanism (4) close to the support position to move and position.

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