A load loading device

Abstract

The present invention relates to the technical field of load testing equipment, and provides a load loading device, wherein the load loading device includes a support frame, which is formed with a loading cavity; a loading assembly, which is arranged in the loading cavity and is used to apply a load to a bridge to be tested; a lifting assembly, which is connected to the loading assembly and controls the lifting and lowering of the loading assembly in the loading cavity; and a bridge support block, which is installed on both sides of the support frame and is used to support the bridge to be tested. By arranging the lifting assembly to be connected with the loading assembly and controlling the lifting and lowering of the loading assembly, the load on the bridge to be tested can be applied and released, and the load on the bridge to be tested can be automatically loaded, thereby ensuring uniform loading and improving test efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of load testing equipment, and in particular to a load loading device. Background Art

[0002] Cable trays are used to lay wires and cables indoors and outdoors in industrial and civil buildings, and for high and low voltage power transmission and distribution projects. According to JB / T 10216, a mechanical load test requires connecting two sections of cable tray and placing them on supports with a span of 2 meters. The safe working load is then evenly applied to the cable tray at least four times. After loading, the deformation at the mid-span joint should not exceed the specified deflection value.

[0003] At present, the existing technology does not have relevant testing equipment for mechanical load testing of cable trays. The laboratories of various testing institutions and manufacturers all use manual loading methods, which are inefficient, difficult to ensure loading uniformity, and easily cause waist injuries to test personnel, and are prone to rollover or collapse causing injuries or damage to displacement measurement equipment, resulting in low test efficiency. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention proposes a load-loading device. By connecting a lifting assembly with a loading assembly, the lifting and lowering of the loading assembly are controlled to apply and release the load to the bridge to be tested. This can automatically load the bridge to be tested, ensure uniform loading, and improve test efficiency.

[0005] A load loading device according to an embodiment of the present invention includes:

[0006] a support frame, forming a loading cavity;

[0007] A loading assembly, disposed in the loading cavity, for applying a load to the bridge to be tested;

[0008] a lifting assembly connected to the loading assembly to control the lifting and lowering of the loading assembly in the loading chamber;

[0009] The bridge support blocks are installed on both sides of the support frame and are used to support the bridge to be tested.

[0010] According to the load loading device of an embodiment of the present invention, the loading assembly includes:

[0011] a loading frame connected to the lifting assembly;

[0012] A plurality of groups of loading columns of different lengths are mounted on the loading frame.

[0013] According to the load loading device of an embodiment of the present invention, a plurality of supporting plates are provided on the loading frame, through holes are opened on the supporting plates, and the loading columns are passed through the through holes and slide up and down along the through holes.

[0014] According to the load loading device of an embodiment of the present invention, the loading frame further includes a guide shaft and a counterweight platform, the guide shaft is fixed on the loading frame, and the counterweight platform passes through the guide shaft and slides along the guide shaft.

[0015] According to the load loading device of an embodiment of the present invention, the bridge support block includes round steel and steel bars. The round steel is fixed on the support frame, and the steel bars are arranged on the round steel to support the bridge to be tested.

[0016] According to the load loading device of an embodiment of the present invention, the load loading device further comprises a lifting platform, which is arranged in the loading chamber and is used to control the bridge to be tested to be placed on the bridge support block and away from the bridge support block.

[0017] According to the load loading device of an embodiment of the present invention, the lifting platform includes a lifting frame and an elevator. The lifting frame is provided with a plurality of rollers. The elevator is connected to the lifting frame to control the lifting and lowering of the lifting frame.

[0018] According to the load loading device of an embodiment of the present invention, the load loading device further comprises a bridge conveying assembly, which is installed on one side of the support frame and is used to convey the bridge to be tested to the lifting platform.

[0019] According to the load loading device of the embodiment of the present invention, two anti-collapse supports are provided on the support frame, and the installation height of the anti-collapse supports is lower than the installation height of the bridge support block.

[0020] According to the load loading device of an embodiment of the present invention, a displacement sensor is provided between the two anti-collapse supports and slides along a direction parallel to the installation direction of the bridge support block.

[0021] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0022] An embodiment of the present invention provides a load loading device, including a support frame, which is formed with a loading cavity; a loading assembly, which is arranged in the loading cavity and is used to apply a load to a bridge frame to be tested; a lifting assembly, which is connected to the loading assembly and controls the lifting and lowering of the loading assembly in the loading cavity; a bridge frame support block, which is installed on both sides of the support frame and is used to support the bridge frame to be tested. By setting the lifting assembly to be connected with the loading assembly and controlling the lifting and lowering of the loading assembly, the application and release of the load on the bridge frame to be tested can be realized, and the load on the bridge frame to be tested can be automatically loaded, thereby ensuring uniform loading and improving test efficiency.

[0023] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a front view of a load loading device provided by an embodiment of the present invention;

[0026] Figure 2 1 is a schematic structural diagram of a load loading device provided by an embodiment of the present invention;

[0027] Figure 3 It is a left side view of the load loading device provided by an embodiment of the present invention;

[0028] Figure 4 is a structural diagram of a loading component provided by an embodiment of the present invention;

[0029] Figure 5 1 is a schematic structural diagram of a bridge support member provided by an embodiment of the present invention;

[0030] Figure 6 Schematic diagram of the structure of the displacement sensor provided by an embodiment of the present invention.

[0031] Reference numerals:

[0032] 1. Support frame; 11. Crossbar; 12. Cable tray fixture plate;

[0033] 2. Loading assembly; 21. Loading frame; 22. Loading column; 23. Support plate; 231. Through hole; 24. Guide shaft; 25. Counterweight platform; 221. Cylinder; 222. End cap;

[0034] 3. Lifting assembly; 31. Lifting motor; 32. Lead screw;

[0035] 4. Bridge support block; 41. Round steel; 42. Steel bar;

[0036] 5. Lifting platform; 51. Lifting frame; 52. Lifter; 511. Roller;

[0037] 6. Bridge conveying assembly; 61. Conveying frame;

[0038] 7. Anti-collapse support;

[0039] 8. Displacement sensor; 81. Fixed shaft; 82. Bearing; 83. First fixed plate; 84. Guide rail; 85. Slider; 86. Second fixed plate; 87. Fixed seat; 88. Sensor dial indicator;

[0040] 9. Bridge to be tested. DETAILED DESCRIPTION

[0041] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0042] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the embodiments of the present invention and to simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0044] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0045] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0046] An embodiment of one aspect of the present invention, in combination with Figures 1 to 6 As shown, a load loading device is provided, including a support frame 1, which is formed with a loading cavity; a loading component 2, which is arranged in the loading cavity and is used to apply a load to a bridge frame 9 to be tested; a lifting component 3, which is connected to the loading component 2, and controls the lifting and lowering of the loading component 2 in the loading cavity; a bridge frame support block 4, which is installed on both sides of the support frame 1, and is used to support the bridge frame 9 to be tested. By setting the lifting component 3 to be connected with the loading component 2, the lifting and lowering of the loading component 2 is controlled to realize the application and release of the load on the bridge frame 9 to be tested, and the automatic loading of the load on the bridge frame 9 to be tested can be realized, thereby ensuring uniform loading and improving test efficiency.

[0047] Among them, in order to ensure that the load loading device has sufficient rigidity, the support frame 1 can be made of square steel. The specifications of the square steel can be selected according to the specifications of the bridge frame 9 to be tested and the size of the load, so as to avoid deformation when the bridge frame 9 to be tested is loaded with load, thereby interfering with the test results.

[0048] According to one embodiment of the present invention, Figure 2 and Figure 4As shown, the loading assembly 2 includes a loading frame 21 and several groups of loading columns 22 of different lengths, wherein the loading frame 21 is connected to the lifting assembly 3, the loading columns 22 are installed on the loading frame 21, and extend toward the direction of the bridge frame 9 to be tested, and the lifting assembly 3 includes a lifting motor 31 and a screw 32, the output shaft of the lifting motor 31 is connected to the screw 32, and the rotation of the lifting motor 31 is converted into the up and down movement of the screw 32, and the lower end of the screw 32 is fixedly connected to the loading frame 21, driving the loading frame 21 to move up and down, thereby realizing the loading column 22 below the loading frame 21 to contact and move away from the bridge frame 9 to be tested, thereby realizing the loading and unloading of the load of the bridge frame 9 to be tested.

[0049] It can be understood that the lengths of the loading columns 22 installed on the same support plate 23 are consistent, and the lengths of the loading columns 22 on different support plates 23 are not equal, so that when the lifting assembly 3 controls the loading assembly 2 to descend, the loading columns 22 on the support plate 23 contact the bridge frame 9 to be tested in batches, thereby realizing batch loading of the load of the bridge frame 9 to be tested.

[0050] Optional, reference Figure 1 As shown, the lengths of the loading columns 22 on the support plate 23 can also be symmetrically distributed with the span midline as the symmetry axis, that is, the lengths of the loading columns 22 on both sides are symmetrically distributed. In this way, when the load is loaded, the load loading on both sides of the bridge 9 to be tested is symmetrical, which improves the uniformity of the load loading. Optionally, the lengths of the loading columns 22 are divided into four groups, that is, the loading columns 22 are set to four stepped lengths, such as Figure 2 As shown, the loading columns 22 are distributed from long to short from the axis of symmetry to both sides. When the load is applied, the load is first applied to the middle of the bridge 9 to be measured, and then gradually applied outward to the two ends of the bridge 9 to be measured. The load is applied to the bridge 9 to be measured in batches, which can be used to apply mechanical loads one by one, so that the total load is applied to the bridge 9 to be measured in four batches.

[0051] Optionally, a lifting assembly 3 is provided at both ends of the support frame 1, and the lifting motors 31 are respectively fixed on the support frames 1 at both ends, and the lead screws 32 at both ends are respectively fixedly connected to the two ends of the loading frame 21. By controlling the forward and reverse rotation of the lifting motor 31, the up and down movement of the loading frame 21 can be controlled to realize the loading and unloading of the load of the bridge frame 9 to be tested. Optionally, the lifting assembly 3 can also be provided only at one end of the support frame 1, and this application does not make any specific restrictions on this.

[0052] According to an embodiment of the present invention, referring to Figure 3As shown, a plurality of loading columns 22 are sequentially arranged on the support plate 23 along the width direction of the cable tray 9 to be tested, and the loading columns 22 are evenly arranged. When the cable tray of the maximum allowable width is loaded, the ends of all the loading columns 22 contact the cable tray 9 to be tested and participate in the loading. When the width of the cable tray is less than the maximum allowable width, the loading columns 22 outside the width range of the cable tray fall to the outside of the cable tray and do not participate in the loading. Only the loading columns 22 within the range of the cable tray participate in the loading of the load, thereby meeting the loading test requirements of cable trays of different widths.

[0053] According to an embodiment of the present invention, referring to Figure 4 As shown, a plurality of support plates 23 are provided on the loading frame 21, and the support plates 23 are fixed on the loading frame 21. A plurality of through holes 231 are provided on each support plate 23. The loading column 22 is passed through the through holes 231 and can move up and down along the through holes 231. It can be understood that in order to prevent the loading column 22 and the support plate 23 from separating, the loading column 22 is composed of a cylinder 221 and an end cover 222 provided above the cylinder 221. The diameter of the end cover 222 is slightly larger than the diameter of the through hole 231. One end of the loading column 22 with the end cover 222 is provided above the support plate 23, and the other end of the loading column 22 extends downward through the through hole 231, so that after the lower end of the loading column 22 contacts the bridge 9 to be tested, when the lifting assembly 3 controls the loading assembly 2 to continue to descend, the loading column 22 cannot continue to descend due to the obstruction of the bridge 9 to be tested. At this time, the support plate 23 can still continue to descend under the drive of the lifting assembly 3.

[0054] According to an embodiment of the present invention, referring to Figure 4 As shown, the loading frame 21 further includes a guide shaft 24 and a counterweight platform 25. The guide shaft 24 is fixed to the loading frame 21, and the counterweight platform 25 is provided on the guide shaft 24 and can slide up and down along the guide shaft 24. Optionally, two guide shafts 24 are fixed to each support plate 23, and a counterweight platform 25 is provided on the guide shaft 24. The counterweight platform 25 can move up and down along the guide shaft 24, wherein a plurality of counterweight blocks are placed on the counterweight platform 25. The total weight of the counterweight blocks on each counterweight platform 25 can be the same or different, and is determined according to the load size set in the test. By controlling the weight of the counterweight blocks on the counterweight platform 25, the size of the load can be conveniently controlled. This application does not make specific limitations on this.

[0055] Understandably, the reference Figure 1 and Figure 3As shown, after the lower end of the loading column 22 contacts the bridge 9 to be tested, when the lifting assembly 3 controls the loading assembly 2 to continue to descend, the loading column 22 cannot continue to descend due to the obstruction of the bridge 9 to be tested. At this time, the support plate 23 can still continue to descend under the drive of the lifting assembly 3. The end cover 222 at the upper end of the loading column 22 can lift the counterweight platform 25 above the support plate 23, that is, the counterweight platform 25 is always in contact with the loading column 22, applying a load to the bridge 9 to be tested. After the lower end of the longest loading column 22 contacts the bridge 9 to be tested, the loading frame 21 and the support plate 23 can still continue to descend, so that the shorter loading columns 22 on other support plates 23 can continue to descend with the loading frame 21, and continue to apply load to other parts of the bridge 9 to be tested. By setting multiple groups of loading columns 22 of different lengths, multiple loading of the load of the bridge 9 to be tested can be achieved, meeting the test requirements.

[0056] Understandably, the reference Figure 1 As shown, during the test, since the length of the middle loading column 22 is longer, the lengths of the loading columns 22 at both ends decrease successively. The middle part of the bridge 9 to be tested receives the load first, and then the load is gradually applied to both ends of the bridge 9 to be tested.

[0057] According to one embodiment of the present invention, the load-applying device also includes a control system and a data processing system. The control system comprises a programmable controller, a touch screen, and a switching power supply. The programmable controller utilizes a programmable electronic control system and employs a centralized control method, enabling access to an external network, as well as remote and local control and real-time monitoring. The data processing system, comprised of a PLC, enables multi-point operation and monitoring through networking, achieving automated detection, data collection, and control of the entire testing process, thereby improving test efficiency.

[0058] It can be understood that the control system can control the lifting and lowering of the lifting component 3 and the loading component 2 connected to the lifting component 3 to realize the loading and unloading of the load, and control the lifting and lowering of the lifting platform 5 to realize the lifting and lowering of the bridge frame 9 to be tested. At the same time, the control system can also set the time for maintaining the load after loading.

[0059] According to an embodiment of the present invention, referring to Figure 5 As shown, the bridge support block 4 includes round steel 41 and steel bar 42. The round steel 41 is fixed to the support frame 1, and the steel bar 42 is set on the round steel 41 to support the bridge to be tested 9. Optionally, the round steel 41 has a diameter of 20 mm and is fixed to the cross bars 11 on both sides of the support frame 1. The upper part of the steel bar 42 is flat and is used to support the bridge to be tested 9. The steel bar 42 is 30 mm wide and 20 mm high, with a V-shaped bottom and a V-groove with a depth of 5 mm and an angle of 120°. The round steel 41 is accommodated in the V-groove.

[0060] According to an embodiment of the present invention, referring to Figure 1 and Figure 2 As shown, in order to facilitate the control of placing the bridge frame 9 to be tested on the bridge frame support block 4 and away from the bridge frame support block 4, the load loading device is also provided with a lifting platform 5. The lifting platform 5 is arranged at the bottom of the loading chamber, and the bridge frame 9 to be tested can be placed on the lifting platform 5. The lifting of the lifting platform 5 can realize the placement of the bridge frame 9 to be tested on the bridge frame support block 4 and away from the bridge frame support block 4 after the test is completed.

[0061] According to an embodiment of the present invention, referring to Figure 1 and Figure 2 As shown, the lifting platform 5 includes a lifting frame 51 and an elevator 52. The lifting frame 51 is provided with a plurality of rotatable rollers 511. The elevator 52 is connected to the lifting frame 51 to control the lifting of the lifting frame 51. Optionally, a lift 52 is provided below the lifting frame 51. The output shaft of the lift 52 is connected to a flange, which is connected to a lifting screw. One side of the flange is connected to the other side of the flange via a coupling and an optical axis. The upper end of the lifting screw is fixedly connected to the lifting frame 51, driving the lifting frame 51 to rise and fall.

[0062] According to one embodiment of the present invention, a cable tray fixture plate 12 is provided at each end of the support frame 1 to clamp and secure the cable tray during the test, preventing the cable tray 9 under test from flipping or shifting during the test, which could result in abnormal test results. Optionally, the cable tray fixture plate 12 is provided with a plurality of evenly spaced positioning holes. By fixing different positioning holes to the support frame 1, cable trays 9 under test of different widths can be secured.

[0063] According to an embodiment provided by the present invention, the load loading device also includes a bridge conveying assembly 6, which is installed on one side of the support frame 1 and is used to convey the bridge 9 to be tested to the lifting platform 5. Optionally, the bridge conveying assembly 6 includes a conveying frame 61 and rollers installed on the conveying frame 61. The height of the conveying frame 61 is consistent with the height of the cross bar 11 at the bridge support block 4 set on the support frame 1, and the height of the roller 511 closer to the bridge support block 4 is slightly higher than the height of the roller 511 at the far end. When the bridge 9 to be tested is placed on the bridge support block 4 in accordance with standard requirements, it is ensured that the overhanging parts at both ends of the bridge 9 to be tested will not contact the bridge conveying assembly 6; the upper surface of the conveying frame 61 can also be set to a shape inclined to one end, so that the overhanging parts at both ends of the bridge 9 to be tested are placed in contact with the bridge conveying assembly 6. This application does not make specific restrictions on this.

[0064] According to an embodiment provided by the present invention, two anti-collapse supports 7 are provided at the bottom of the support frame 1, and the installation height of the anti-collapse supports 7 is lower than the installation height of the bridge support block 4. For example, the height of the anti-collapse supports 7 is 30 mm lower than the height of the bridge support block 4 to prevent the displacement sensor 8 below from being damaged when the bridge frame 9 to be measured collapses.

[0065] According to an embodiment of the present invention, referring to Figure 2 As shown, a displacement sensor 8 is provided between the two anti-collapse supports 7 and slides in a direction parallel to the installation direction of the bridge support block 4. The displacement sensor 8 is used to measure the deformation of the bridge 9 to be tested after the load is applied and analyze the stress condition of the bridge 9 to be tested. Figure 6 As shown, the displacement sensor 8 includes a fixed shaft 81, a bearing 82, a first fixed plate 83, a guide rail 84, a slider 85, a second fixed plate 86, a fixed seat 87 and a sensor dial indicator 88. Both ends of the fixed shaft 81 are fixed on the anti-collapse support 7, the bearing 82 is sleeved on the fixed shaft 81, and the side of the bearing 82 is fixedly connected to the first fixed plate 83. The guide rail 84 is installed on the first fixed plate 83, and the extension direction of the guide rail 84 is parallel to the setting direction of the bridge support block 4. The slider 85 is slidably connected to the guide rail 84. The second fixed plate 86 is fixed on the slider 85 and moves with the movement of the slider 85. The second fixed plate 86 is installed with a fixed seat 87, and the fixed seat 87 is used to install the sensor dial indicator 88.

[0066] An embodiment of the present invention provides a load loading device, including a support frame 1, which is formed with a loading cavity; a loading component 2, which is arranged in the loading cavity and is used to apply a load to a bridge frame 9 to be tested; a lifting component 3, which is connected to the loading component 2, and controls the lifting and lowering of the loading component 2 in the loading cavity; a bridge support block 4, which is installed on both sides of the support frame 1, and is used to support the bridge frame 9 to be tested. By setting the lifting component 3 to be connected with the loading component 2, the lifting and lowering of the loading component 2 is controlled to realize the application and release of the load on the bridge frame 9 to be tested, and the automatic loading of the load on the bridge frame 9 to be tested can be realized, thereby ensuring uniform loading and improving test efficiency.

[0067] It should be noted that the order of the embodiments of the present application described above is for descriptive purposes only and does not represent the superiority or inferiority of the embodiments. The above description is of specific embodiments of this specification. In some cases, the actions or steps described in the specification can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0068] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions 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 embodiments, those skilled in the art should understand that they may modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents; such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention and are therefore intended to be included within the scope of protection of this application.

Claims

1. A load loading device, characterized in that: include: A support frame (1) is formed with a loading cavity; A loading assembly (2) is arranged in the loading cavity and is used to apply a load to the bridge (9) to be tested; A lifting assembly (3) connected to the loading assembly (2) to control the lifting and lowering of the loading assembly (2) in the loading chamber; Bridge support blocks (4), mounted on both sides of the support frame (1), for supporting the bridge frame to be tested (9); The loading component (2) comprises: A loading frame (21) connected to the lifting assembly (3); A plurality of groups of loading columns (22) of different lengths, wherein the loading columns (22) are mounted on the loading frame (21); A plurality of supporting plates (23) are provided on the loading frame (21), and a through hole (231) is provided on the supporting plate (23). The loading column (22) is passed through the through hole (231) and slides up and down along the through hole (231); The loading frame (21) further comprises a guide shaft (24) and a counterweight platform (25), wherein the guide shaft (24) is fixed on the loading frame (21), and the counterweight platform (25) is passed through the guide shaft (24) and slides along the guide shaft (24).

2. The load loading device according to claim 1, characterized in that: The bridge support block (4) comprises a round steel (41) and a steel bar (42), wherein the round steel (41) is fixed on the support frame (1), and the steel bar (42) is arranged on the round steel (41) and is used to support the bridge to be tested (9).

3. The load loading device according to claim 1 or 2, characterized in that: The load loading device further comprises a lifting platform (5), which is arranged in the loading chamber and is used to control the bridge to be tested (9) to be placed on the bridge support block (4) and away from the bridge support block (4).

4. The load loading device according to claim 3, characterized in that: The lifting platform (5) comprises a lifting frame (51) and an elevator (52). The lifting frame (51) is provided with a plurality of rollers (511). The elevator (52) is connected to the lifting frame (51) to control the lifting of the lifting frame (51).

5. The load loading device according to claim 3, characterized in that: The load loading device further comprises a bridge conveying assembly (6), which is installed on one side of the support frame (1) and is used to convey the bridge to be tested (9) to the lifting platform (5).

6. The load applying device according to claim 1 or 2, characterized in that: Two anti-collapse supports (7) are provided on the support frame (1), and the installation height of the anti-collapse supports (7) is lower than the installation height of the bridge support block (4).

7. The load applying device according to claim 6, characterized in that: A displacement sensor (8) is provided between the two anti-collapse supports (7) and slides in a direction parallel to the installation direction of the bridge support block (4).

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