Bending creep test loading device based on lever principle

Abstract

The utility model relates to the technical field of mechanical property testing devices, in particular to a bending creep test loading device based on the lever principle, which comprises a foundation platform, a span adjusting base, a load bearing platform and a load bearing platform, the two span adjusting upper supports are detachably and fixedly installed at the top end of the span adjusting base, the loading supports are placed at the top ends of the span adjusting upper supports, a test piece is placed at the top ends of the two loading supports, the lever support is detachably and fixedly installed on the left side of the foundation platform, and the top end of the lever support is hinged to one end of the loading arm. One or more loading plates are detachably and fixedly installed at the position, located above the test piece, of the bottom end of the loading arm, a loading rod is fixedly connected to the middle of the bottom end of each loading plate and makes contact with the top end face of the test piece in a pressing mode, and a loading assembly is arranged at the other end of the loading arm. The problems that a balancing weight needed by a bending creep test is large in weight and difficult to load and unload are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical performance testing devices, in particular to a bending creep testing loading device utilizing the lever principle. Background Art

[0002] Under the long-term action of load, the deformation of concrete, wood, resin-based composite materials, etc. will increase over time, that is, when the stress remains unchanged, the strain of the material continues to increase over time. This phenomenon is called creep. Many materials can be observed to have obvious creep deformation in the natural environment. When the temperature of the environment in which the material is located rises or the temperature of the material itself rises due to internal friction under the action of load, the creep deformation will develop rapidly. The occurrence of creep will affect the dimensional stability of various structural components composed of these materials and reduce their safety during long-term service. In this context, in order to improve the reliability of the structure, it is necessary to carry out creep performance testing on various structural components.

[0003] However, the successful implementation of creep performance testing must rely on advanced creep loading devices. Creep performance tests include different types such as bending, tension, compression, and shear. Unlike static mechanical performance testing, which can use a universal testing machine to perform a variety of mechanical performance tests, the application range of creep loading devices is very limited. In addition to the testing machine mainly used for metal tensile creep performance testing, other types of creep loading devices usually need to be designed and manufactured according to actual test requirements. However, in order to save time and cost, creep tests often choose to skip the stage of creep loading device design and manufacturing, and use a simple method of directly stacking or hanging weights at the loading position to apply loads. This results in a very small range of load levels that can be selected for creep testing, and most of the creep curves obtained by creep testing remain in the first or second stage of creep. If a practical creep loading device can be designed to test the creep performance of the specimen from low load levels to high load levels, it will inevitably be conducive to a more comprehensive and comprehensive analysis of its creep performance. Utility Model Content

[0004] The utility model aims to provide a bending creep test loading device using the lever principle to solve the technical problems existing in the above-mentioned background technology.

[0005] To achieve the above purpose, the technical solution of the utility model is as follows:

[0006] A bending creep test loading device using the lever principle comprises: a basic platform, a span adjustment base, a span adjustment upper support, a lever support and a test piece, wherein the span adjustment base is detachably fixedly installed at the middle of the top of the basic platform, two span adjustment upper supports are provided, the two span adjustment upper supports are vertically parallel and arranged at the same height and are detachably fixedly installed at the top of the span adjustment base, the position of the span adjustment upper support at the top of the span adjustment base can be adjusted left and right, a loading support is placed at the top of the span adjustment upper support, the test piece is placed at the top of the two loading supports, the lever support is detachably fixedly installed on the left side of the basic platform, one end of a loading arm is hinged at the top of the lever support, one or more loading plates are detachably fixedly installed at the bottom end of the loading arm at a position above the test piece, a loading rod is fixedly connected to the middle of the bottom end of the loading plate, the loading rod is pressed and contacted with the top surface of the test piece, and a loading assembly is provided at the other end of the loading arm.

[0007] Furthermore, the foundation platform is made of reinforced concrete and has a height greater than 200 mm, and a number of anchor rods are pre-buried in the middle and left sides thereof, wherein the anchor rods in the middle are used to install the span adjustment base; and the anchor rods on the left are used to install the lever support.

[0008] Furthermore, the span adjustment base includes: a horizontally placed first I-beam and two first end plates respectively fixedly connected to the left and right ends of the first I-beam, a plurality of first through holes are symmetrically arranged on the front and rear sides of the bottom end of the first I-beam, a plurality of anchor rods in the middle of the base platform correspond one by one to the plurality of first through holes, and the plurality of anchor rods respectively penetrate the plurality of first through holes from bottom to top and are threadedly connected with first nuts above the first through holes.

[0009] Furthermore, the lever support includes: a mounting base, a column, a reinforcing rib and a T-shaped hinge seat, a plurality of second through holes are symmetrically opened at the four corners of the mounting base, a plurality of anchor rods on the left side of the base platform correspond one to one with the plurality of second through holes, the plurality of anchor rods respectively pass through the plurality of second through holes from bottom to top and are threadedly connected with the first nut above the second through holes, the column is a square tube type, the column is welded and fixed to the middle part of the top end of the mounting base, the T-shaped hinge seat is welded and fixed to the middle part of the top end of the column; a plurality of reinforcing ribs are provided, and the plurality of reinforcing ribs are respectively welded and fixed to the connection between the column and the mounting base.

[0010] Furthermore, it also includes: a second bolt and a second nut, wherein the second bolt and the second nut are respectively provided with a plurality of them, two parallel strip grooves are symmetrically opened on the front and rear sides of the top end of the first I-beam, and the strip grooves are arranged horizontally, and the span adjustment upper support includes: a vertical second I-beam and two second end plates respectively welded and fixed on the upper and lower ends of the second I-beam, wherein the second end plate at the lower end is symmetrically opened on the front and rear sides, the plurality of third through-holes on the front side correspond to the strip grooves on the front side, and the plurality of third through-holes on the rear side correspond to the strip grooves on the rear side, a plurality of second bolts penetrate the two strip grooves and the corresponding plurality of third through-holes from bottom to top in sequence and are respectively threadedly connected to a plurality of second nuts above the third through-holes; the second bolts are horizontally slidably connected to the strip grooves.

[0011] Furthermore, the loading support includes: a steel block and a steel roller shaft, the steel roller shaft is cylindrical, the steel roller shaft is longitudinally welded or placed in the middle of the top surface of the steel block, the steel block is placed in the middle of the top end of the second end plate at the upper end of the second I-beam, and the specimen is placed transversely on the two steel roller shafts.

[0012] Furthermore, it also includes: an articulated bolt, one end of the loading arm is hinged to the T-shaped articulated seat at the top end of the lever support through the articulated bolt.

[0013] Furthermore, it also includes: mounting bolts, wherein a plurality of mounting bolts are provided, a plurality of bolt holes are evenly provided at the four corners of the loading plate, a plurality of fourth through holes are provided at the bottom end of the loading arm, and a plurality of mounting bolts penetrate the plurality of fourth through holes from top to bottom and are respectively threadedly connected to the plurality of bolt holes.

[0014] Furthermore, the loading assembly includes: a steel beam, a hanging basket and a counterweight. The steel beam is a square tube type and is longitudinally welded and fixed to the top of the other end of the loading arm. A hanging basket is hung on the steel beam, and a counterweight is placed in the hanging basket.

[0015] Furthermore, the hanging basket is a steel hanging basket or a plastic container bag, and the counterweight block is a steel block, other solid metal blocks or concrete blocks.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The dimensions of each component of the bending creep test loading device proposed by the utility model, the ratio of the power arm to the resistance arm, the loading method (three-point bending, four-point bending, etc.), the support type, the test span, etc. can all be independently selected and adjusted according to the test requirements, which greatly broadens the application scope of the bending creep test loading device; and by utilizing the lever principle, the mass of the counterweight block required for loading is greatly reduced, solving the problem that the bending creep loading device can apply a small load level range and difficult loading and unloading. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model when no test piece is placed;

[0019] Figure 2 It is a schematic diagram of the structure of the utility model when placing a test piece;

[0020] Figure 3 It is an elevation view of the utility model when the test piece is placed;

[0021] Figure 4 It is a structural schematic diagram of the mid-span adjustment base of the utility model;

[0022] Figure 5 It is a structural schematic diagram of the upper support for mid-span adjustment in the utility model;

[0023] Figure 6 It is a structural schematic diagram of the lever support in the utility model;

[0024] Figure 7 It is a structural schematic diagram of the loading arm in the utility model;

[0025] Figure 8 It is a structural schematic diagram of the steel crossbeam in the utility model;

[0026] Fig. 9 It is a structural schematic diagram of the hanging basket in the utility model;

[0027] Fig.10 It is a structural schematic diagram of the loading support in the utility model;

[0028] Fig.11 It is a structural schematic diagram of the loading plate in the utility model;

[0029] Fig.12 It is a structural schematic diagram of the hinge bolt in the utility model.

[0030] The numbers in the accompanying drawings are: 1-basic platform, 2-span adjustment base, 3-span adjustment upper support, 4-lever support, 5-loading arm, 6-steel beam, 7-hanging basket, 8-counterweight, 9-loading support, 10-loading plate, 11-anchor rod, 12-hinged bolt, 13-test piece. DETAILED DESCRIPTION

[0031] The utility model is further described in detail below in conjunction with the drawings and embodiments.

[0032] See also Figures 1 to 12As shown, a bending creep test loading device using the lever principle includes: a basic platform 1, a span adjustment base 2, a span adjustment upper support 3, a lever support 4 and a test piece 13. The span adjustment base 2 is detachably fixedly installed in the middle of the top of the basic platform 1. Two span adjustment upper supports 3 are provided. The two span adjustment upper supports 3 are vertically parallel and arranged at the same height and are detachably fixedly installed on the top of the span adjustment base 2 respectively. The position of the span adjustment upper support 3 at the top of the span adjustment base 2 can be adjusted left and right. A loading support 9 is placed on the top of the span adjustment upper support 3. The test piece 13 is placed on the top of the two loading supports 9. The lever support 4 is detachably fixedly installed on the left side of the basic platform 1. One end of a loading arm 5 is hinged on the top of the lever support 4. One or more loading plates 10 are detachably fixedly installed at the bottom end of the loading arm 5 above the test piece 13. A loading rod is fixedly connected to the middle of the bottom end of the loading plate 10. The loading rod presses and contacts the top surface of the test piece 13. A loading assembly is provided at the other end of the loading arm 5.

[0033] In this embodiment, the foundation platform 1 is made of reinforced concrete and has a height greater than 200 mm, and a plurality of anchor rods 11 are pre-buried in the middle and left sides thereof, wherein the plurality of anchor rods 11 in the middle are used to install the span adjustment base 2; the plurality of anchor rods 11 on the left are used to install the lever support 4; the height of the foundation platform is greater than 200 mm to ensure that the pre-buried anchor rods have sufficient anchoring depth.

[0034] In this embodiment, the span adjustment base 2 includes: a horizontally placed first I-beam and two first end plates respectively fixedly connected to the left and right ends of the first I-beam, a plurality of first through holes are symmetrically arranged on the front and rear sides of the bottom end of the first I-beam, a plurality of anchor rods 11 in the middle of the basic platform 1 correspond one by one to the plurality of first through holes, and the plurality of anchor rods 11 respectively penetrate the plurality of first through holes from bottom to top and are threadedly connected with first nuts above the first through holes.

[0035] In this embodiment, the lever support 4 includes: a mounting base, a column, a reinforcing rib and a T-shaped hinge seat. A plurality of second through holes are symmetrically opened at the four corners of the mounting base. A plurality of anchor rods 11 on the left side of the basic platform 1 correspond one to one to the plurality of second through holes. The plurality of anchor rods 11 respectively pass through the plurality of second through holes from bottom to top and are threadedly connected to the first nuts above the second through holes. The column is a square tube type, and the column is welded and fixed to the middle part of the top end of the mounting base, and the T-shaped hinge seat is welded and fixed to the middle part of the top end of the column. A plurality of reinforcing ribs are provided, and the plurality of reinforcing ribs are respectively welded and fixed to the connection between the column and the mounting base. The reinforcing ribs are provided to improve the connection strength between the column and the mounting base.

[0036] In this embodiment, the bending creep test loading device using the lever principle also includes: a second bolt and a second nut, wherein a plurality of second bolts and second nuts are respectively arranged, and two parallel strip grooves are symmetrically opened on the front and rear sides of the top end of the first I-beam, and the strip grooves are arranged horizontally, and the span adjustment upper support 3 includes: a vertical second I-beam and two second end plates respectively welded and fixed at the upper and lower ends of the second I-beam, wherein a plurality of third through-holes are symmetrically opened on the front and rear sides of the second end plate at the lower end, and a plurality of third through-holes on the front side correspond to the strip grooves on the front side, and a plurality of third through-holes on the rear side correspond to the strip grooves on the rear side, and a plurality of second bolts penetrate the two strip grooves and the corresponding plurality of third through-holes from bottom to top in sequence and are respectively threadedly connected to a plurality of second nuts above the third through-holes; the second bolts are horizontally slidably connected to the strip grooves, and the position adjustment of the span adjustment upper support 3 can be facilitated by the arrangement of the strip grooves.

[0037] In this embodiment, the loading support 9 includes: a steel block and a steel roller shaft. The steel roller shaft is cylindrical. The steel roller shaft is longitudinally welded or placed in the middle of the top surface of the steel block. The steel block is placed in the middle of the top of the second end plate at the upper end of the second I-beam. The specimen 13 is placed horizontally on the two steel roller shafts. According to the simulated support form, the steel roller shaft can independently choose whether to be welded into a whole with the steel block: if a fixed support is simulated, it is welded into a whole; if a hinged support is simulated, the steel roller shaft can be directly placed above the steel block.

[0038] In this embodiment, the bending creep test loading device using the lever principle further includes: an articulated bolt 12 , and one end of the loading arm 5 is articulated to the T-shaped articulated seat at the top end of the lever support 4 through the articulated bolt 12 .

[0039] In this embodiment, the bending creep test loading device using the lever principle also includes: mounting bolts, a plurality of mounting bolts are provided, a plurality of bolt holes are evenly provided at the four corners of the loading plate 10, a plurality of fourth through holes are provided at the bottom end of the loading arm 5, and a plurality of mounting bolts penetrate the plurality of fourth through holes from top to bottom and are respectively threadedly connected to the plurality of bolt holes.

[0040] In this embodiment, the loading assembly includes: a steel beam 6, a hanging basket 7 and a counterweight 8. The steel beam 6 is a square tube type. The steel beam 6 is longitudinally welded and fixed to the top of the other end of the loading arm 5. A hanging basket 7 is hung on the steel beam 6, and a counterweight 8 is placed in the hanging basket 7. The hanging basket 7 is a steel hanging basket or a plastic container bag, and the counterweight 8 is a steel block, other solid metal block or concrete block.

[0041] The construction and assembly process of a bending creep test loading device using the lever principle:

[0042] Determine the size of the foundation platform 1 according to actual needs and site conditions; support the formwork and arrange the steel bars according to the size of the foundation platform 1, and weld the anchor rod 11 to the arranged steel bars; pour concrete, and after curing for 28 days under standard curing conditions, fix the span adjustment base 2 and the lever support 4 at the embedded anchor rod 11 by bolting; the loading arm 5 and the lever support 4 are connected at the fulcrum by hinged bolts 12; the loading plate 10 and the loading rod and the loading arm 5, and the span adjustment upper support 3 and the span adjustment base 2 are all connected by bolts; the loading support 9 is directly placed on the span adjustment upper support 3; the steel beam 6 and the loading arm 5 are connected by welding; the steel hanging basket 7 is suspended on the steel beam 6; and the steel counterweight 8 is placed in the steel hanging basket 7.

[0043] The position and number of the loading plates 10 and the loading rods can be freely adjusted according to the requirements of the bending creep test. For example, when performing a three-point bending creep performance test, a group of loading plates 10 and loading rods are fixed at the appropriate position of the loading arm 5; when performing a four-point bending creep performance test, two groups of loading plates 10 and loading rods are fixed at the appropriate position of the loading arm 5. The loading support 9 is composed of a steel block and a steel roller. According to the simulated support form, the steel roller can independently choose whether to be welded to the steel block as a whole: if a fixed support is simulated, it is welded as a whole; if a hinged support is simulated, the steel roller is directly placed above the steel block. In order to ensure that the embedded anchor rod 11 has sufficient anchoring depth, the height of the reinforced concrete foundation platform 1 should generally be greater than 200mm. The span adjustment base 2 is welded by an I-beam and a steel plate, and a strip groove is reserved on its upper surface. The upper support 3 for span adjustment is welded by an I-beam and a steel plate, and its position can be freely adjusted within the range of the strip groove of the span adjustment base 2. The cross-section of the lever support 4 and the steel crossbeam 6 is preferably a square tube. The loading arm 5 can be welded into a whole by two channel steels, or directly made of steel square tubes, or welded into a whole by a combination of two channel steels and steel square tubes. The steel hanging basket can be replaced by a plastic container bag. The steel counterweight can be replaced by other metal blocks, concrete blocks, etc.

[0044] During the above-mentioned construction and assembly process: the size of the reinforced concrete foundation platform 1 of the bending creep test loading device, the type of steel bars, the concrete strength grade, the position, quantity and size of the embedded anchor rods, the size of each component of the upper steel structure, the type and connection method of steel, the position, quantity and size of the reserved bolt holes, etc. can all be flexibly adjusted according to needs.

[0045] An operating method of a bending creep test loading device using the lever principle:

[0046] (1) Determine the ratio of the power arm to the resistance arm;

[0047] The distance between the fulcrum and the loading rod, i.e., the length of the resistance arm, is R, and the distance between the fulcrum and the center of the steel beam, i.e., the length of the power arm, is P. Then, the ratio of the power arm to the resistance arm is P / R. By adjusting the length of the loading arm 5 and the positions of the loading plate and the loading rod 10, the desired ratio of the power arm to the resistance arm can be obtained.

[0048] (2) Calculate the force generated at the loading point of the bending creep test loading device when no steel counterweight is placed;

[0049] Before fixing the loading plate 10, the loading rod and the steel beam 6 to the loading arm 5, use an electronic weighing scale to weigh the mass m1 of the loading arm 5, the mass m2 of the loading plate 10 and the loading rod, the mass m3 of the steel beam 6 and the mass m4 of the steel hanging basket. Multiply the mass of each component by the local gravity acceleration g0 to obtain the weights G1, G2, G3 and G4 of each component corresponding to m1, m2, m3 and m4 respectively. Then multiply the weight of each component by the distance from its center of gravity to the fulcrum and divide it by the resistance arm R to obtain the force F1 (see formula 1) generated at the loading point when the bending creep test loading device is not hung with a steel hanging basket and the force F2 (see formula 2) generated at the loading point when the steel hanging basket is hung.

[0050]

[0051] (3) Calculate the mass of the required steel counterweight;

[0052] According to the design load level of the bending creep test of specimen 13, the force F required to be applied at the loading point under the corresponding load level is calculated. r (F r Should be greater than F1, if F r If it is less than F1, the test plan should be readjusted to determine whether a steel hanging basket is needed: r When the container size is less than F2, there is no need to use a steel basket and plastic container bags can be used. r When it is greater than F2, a steel hanging basket is required. When a steel hanging basket is not required or required, the mass m5 and m6 of the required steel counterweight are respectively (ignoring the weight of the plastic container bag):

[0053]

[0054] (4) Loading process;

[0055] Place the required steel counterweight on the steel hanging basket or in the plastic container bag, and use the jack to prop up the entire loading arm 5. Place the specimen 13 on the loading support 9, and adjust the positions of the loading support 9 and the specimen 13 so that the span between the two supports is the test design span. Loosen the jack oil seal, slowly lower the loading rod to contact the surface of the specimen 13, and then quickly remove the jack so that the required force is instantly applied to the specimen 13. Use a dial indicator to measure the change in the mid-span deflection of the specimen 13 to obtain the corresponding bending creep test data.

[0056] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", "top / bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0057] The above description is only a preferred embodiment of the utility model and does not constitute any form of limitation to the utility model. Any technician familiar with the profession, without departing from the scope of the technical solution of the utility model and based on the technical essence of the utility model, any simple modification, equivalent replacement and improvement made to the above embodiment shall still fall within the scope of protection of the technical solution of the utility model.

Claims

1. A bending creep test loading device using the lever principle, characterized in that: include: A basic platform (1), a span adjustment base (2), a span adjustment upper support (3), a lever support (4) and a test piece (13), wherein the span adjustment base (2) is detachably fixedly mounted on the middle of the top of the basic platform (1), two span adjustment upper supports (3) are provided, the two span adjustment upper supports (3) are vertically parallel and arranged at the same height and are detachably fixedly mounted on the top of the span adjustment base (2), the position of the span adjustment upper support (3) on the top of the span adjustment base (2) can be adjusted left and right, and the top of the span adjustment upper support (3) A loading support (9) is placed, and the test piece (13) is placed on the top of the two loading supports (9). The lever support (4) is detachably fixedly installed on the left side of the base platform (1). The top of the lever support (4) is hinged with one end of a loading arm (5). The bottom end of the loading arm (5) is located above the test piece (13) and is detachably fixedly installed with one or more loading plates (10). The middle part of the bottom end of the loading plate (10) is fixedly connected with a loading rod, and the loading rod is pressed and contacted with the top surface of the test piece (13). The other end of the loading arm (5) is provided with a loading assembly.

2. The bending creep test loading device using the lever principle according to claim 1 is characterized in that: The foundation platform (1) is made of reinforced concrete and has a height greater than 200 mm, and has a plurality of anchor rods (11) pre-buried in the middle and on the left side thereof, wherein the plurality of anchor rods (11) in the middle are used to install the span adjustment base (2); and the plurality of anchor rods (11) on the left side are used to install the lever support (4).

3. The bending creep test loading device using the lever principle according to claim 2 is characterized in that: The span adjustment base (2) comprises: a first horizontal I-beam and two first end plates respectively fixedly connected to the left and right ends of the first I-beam, a plurality of first through holes are respectively symmetrically arranged on the front and rear sides of the bottom end of the first I-beam, a plurality of anchor rods (11) in the middle of the base platform (1) correspond one to one with the plurality of first through holes, the plurality of anchor rods (11) respectively penetrate the plurality of first through holes from bottom to top and are threadedly connected with first nuts above the first through holes.

4. The bending creep test loading device using the lever principle according to claim 2 is characterized in that: The lever support (4) comprises: a mounting base, a column, a reinforcing rib and a T-shaped hinge seat. A plurality of second through holes are symmetrically provided at the four corners of the mounting base. A plurality of anchor rods (11) on the left side of the base platform (1) correspond to the plurality of second through holes one by one. The plurality of anchor rods (11) respectively penetrate the plurality of second through holes from bottom to top and are threadedly connected to first nuts above the second through holes. The column is a square tube type. The column is welded and fixed to the middle of the top end of the mounting base. The T-shaped hinge seat is welded and fixed to the middle of the top end of the column. A plurality of reinforcing ribs are provided. The plurality of reinforcing ribs are respectively welded and fixed to the connection between the column and the mounting base.

5. The bending creep test loading device using the lever principle according to claim 3 is characterized in that: Also includes: The second bolt and the second nut are respectively provided with a plurality of second bolts and the second nut, two parallel strip grooves are symmetrically provided on the front and rear sides of the top end of the first I-beam, and the strip grooves are arranged horizontally. The span adjustment upper support (3) comprises: a vertical second I-beam and two second end plates respectively welded and fixed to the upper and lower ends of the second I-beam, wherein the second end plate at the lower end is symmetrically provided with a plurality of third through holes on the front and rear sides, the plurality of third through holes on the front side correspond to the strip grooves on the front side, and the plurality of third through holes on the rear side correspond to the strip grooves on the rear side, a plurality of second bolts sequentially penetrate the two strip grooves and the corresponding plurality of third through holes from bottom to top and are respectively threadedly connected with a plurality of second nuts above the third through holes; the second bolts are horizontally slidably connected with the strip grooves.

6. The bending creep test loading device using the lever principle according to claim 5, characterized in that: The loading support (9) comprises: a steel block and a steel roller shaft, wherein the steel roller shaft is cylindrical and is longitudinally welded or placed in the middle of the top end surface of the steel block. The steel block is placed in the middle of the top end of the second end plate at the upper end of the second I-beam, and the test piece (13) is placed transversely on the two steel roller shafts.

7. The bending creep test loading device using the lever principle according to claim 4 is characterized in that: Also includes: An articulated bolt (12), one end of the loading arm (5) is articulated on a T-shaped articulated seat at the top end of the lever support (4) through the articulated bolt (12).

8. The bending creep test loading device using the lever principle according to claim 1 is characterized in that: Also includes: Mounting bolts, wherein a plurality of mounting bolts are provided, a plurality of bolt holes are evenly provided at the four corners of the loading plate (10), a plurality of fourth through holes are provided at the bottom end of the loading arm (5), and a plurality of mounting bolts penetrate the plurality of fourth through holes from top to bottom and are respectively threadedly connected to the plurality of bolt holes.

9. The bending creep test loading device using the lever principle according to claim 1, characterized in that: The loading assembly comprises: a steel cross beam (6), a hanging basket (7) and a counterweight (8); the steel cross beam (6) is a square tube type; the steel cross beam (6) is longitudinally welded and fixed to the top of the other end of the loading arm (5); a hanging basket (7) is hung on the steel cross beam (6); and a counterweight (8) is placed in the hanging basket (7).

10. The bending creep test loading device using the lever principle according to claim 9, characterized in that: The hanging basket (7) is a steel hanging basket or a plastic container bag, and the counterweight (8) is a steel block or a concrete block.

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