Portable bending member experiment teaching device

Abstract

The application discloses a portable bending member experimental teaching device, which comprises a base, a walking mechanism, a stand, a test piece support, a crossbeam and a loading mechanism, the walking mechanism is arranged below the base, the stand is fixedly arranged on the base, the crossbeam is arranged above the stand and forms a portal frame with the stand, the test piece support is movably arranged on the stand, a test piece is fixed in the portal frame, and the loading mechanism is arranged above the test piece and below the crossbeam to apply a loading force to the test piece. The experimental device solves the problem that a special test bed or a structural test room is needed for the test, so that teaching departments without the test bed or the special structural test room can also carry out the same experimental teaching activities, and the problem that many teaching institutions cannot carry out relevant teaching experiments due to the lack of the structural test room is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to civil engineering, bridge engineering, water conservancy engineering professional structure flexural member experimental device technical field, especially relates to a portable flexural member experimental teaching device. BACKGROUND

[0002] Flexural member is one of the basic components of civil engineering, bridge engineering and water conservancy engineering in structure, such as common steel beam, reinforced concrete beam and steel truss, which is a very important basic force component. In the teaching process, in order to enable students to have a deep understanding of the course and preliminarily master certain scientific research skills, in addition to theoretical teaching, corresponding experimental teaching is also needed to enable students to deeply understand the stress mechanism of flexural member and establish a solid theoretical foundation.

[0003] Civil engineering, bridge engineering and water conservancy engineering professional structure flexural member experiment must be carried out. The characteristics of this experimental teaching project are as follows: experimental teaching is carried out in groups with classes as units, so multiple sets of equipment are needed to carry out experiments at the same time; the experimental model is basically fixed; the experimental loading capacity requirement is not high; the functional requirement is not much; the unit cost cannot be too high; the operation should be simple; and the occupied space cannot be too large.

[0004] The existing bending member experimental device is basically composed of counterforce facilities, loading equipment and specimen supporting device. The counterforce facilities include counterforce frame and test bed, the counterforce frame is installed on the test bed, the loading equipment is generally installed on the counterforce frame, the specimen is installed on the test bed, the force applied by the loading equipment on the specimen is directly transmitted to the test bed through the supporting device of the specimen, at the same time, the specimen also applies a counterforce on the loading equipment (such as jack), the force is transmitted to the test bed through the counterforce frame, so as to achieve force balance. The test bed is generally built in the space under the special structure test room, mainly of reinforced concrete structure, cannot be moved, is the main test platform of the structure test room, has large bearing capacity, complex design and large investment, one-time investment is more than one million, generally satisfies the scientific research requirements, and the teaching-oriented units generally do not build this platform; the counterforce frame is generally made of steel structure, different tests can have different forms, generally can be made into movable type or fixed type, but all need to be installed on the test bed, and need hoisting equipment when moving, so the structure test room is generally installed with hoisting equipment (such as bridge crane) like a factory. The basic characteristics of the existing equipment are: (1) a special test bed or site is needed to fix the counterframe and supporting device, and transmit the test counterforce, generally suitable for scientific research activities, not suitable for laboratories without test bed; (2) the test device is heavy and inconvenient to move; (3) there is no walking mechanism, and it cannot be moved or is not convenient to move, and needs hoisting equipment when moving; (4) the device production is complex, the cost is high, and the one-time investment is large; (5) it occupies a large laboratory space, and it is not suitable to carry out multiple tests at the same time; (6) the experimental operation is complex, and is not suitable for the characteristics of experimental teaching, and most of them are for scientific research projects. Therefore, a bending member experimental teaching device solving the above problems is needed. SUMMARY

[0005] The bending member experimental teaching device is light, solves the problem that the test needs a special test bed or structure test room, enables teaching departments without a test bed or special structure test room to carry out similar experimental teaching activities, solves the problem that many teaching institutions cannot carry out related teaching experiments due to the lack of a structure test room, and is simple to operate, convenient to move and suitable for carrying out experimental teaching at the same time.

[0006] In order to achieve the above object, the technical scheme adopted by the present application is as follows:

[0007] The utility model provides a portable bending member experimental teaching device, including base, walking mechanism, stand, test piece support, crossbeam and loading mechanism, walking mechanism sets up below the base, the stand is fixedly arranged on the base, the crossbeam is across above the stand and forms a door frame with the stand, the test piece support is movably arranged on the stand, and the both sides of the test piece are fixed on the test piece support and are located in the door frame, the loading mechanism is arranged above the test piece and is located below the crossbeam to the test piece and applies loading force.

[0008] Further, the base is horizontally arranged, and the base has two bases arranged on the two sides of the bottom of the door frame.

[0009] Further, the walking mechanism is a universal wheel, and the universal wheel has four universal wheels fixedly arranged on the bottom of the base to drive the walking mechanism of the whole device.

[0010] Further, the stand has two stands vertically welded above the base, and the two ends of the crossbeam are transversely welded on the top ends of the stands.

[0011] Further, the loading mechanism comprises a pressure sensor, a hydraulic jack, a distribution beam and a distribution support, the pressure sensor is installed below the crossbeam and located in the middle of the crossbeam, the hydraulic jack is installed below the pressure sensor, the distribution beam is located below the hydraulic jack, and the distribution support is installed on the test piece and fixed below the distribution beam.

[0012] Further, the distribution beam is a steel piece with an I-shaped cross section, and the hydraulic jack is located in the middle of the distribution beam to apply uniform load to the test piece.

[0013] Further, the distribution support comprises a first positioning bolt, a first positioning ear plate, a first roller and a first base, the first positioning ear plate has two first positioning ear plates fixed in parallel above the first base, the first roller is fixed in the middle of the two first positioning ear plates, and the first positioning ear plate and the first roller are fixed by cooperating the first positioning bolt with the screw holes arranged on the first positioning ear plate.

[0014] Further, the test piece support comprises a second positioning bolt, a second positioning ear plate, a second roller, a support plate, a rib plate and a connecting plate, the connecting plate is vertically arranged on the side of the test piece support and fixedly connected with the stand, the support plate is horizontally welded on the side of the connecting plate, the rib plate is welded below the support plate to support the support plate, the second positioning ear plate is arranged in parallel on the support plate, the second roller is arranged between the second positioning ear plates and fixed by cooperating the second positioning bolt with the screw holes arranged on the second positioning ear plate.

[0015] Further, the test piece support is screwed into fixation by matching with the screw hole and screw on the stand.

[0016] Further, the inner side of the stand is provided with several rows of fixed screw holes, and the position of the test piece is determined by fixing the test piece support on different screw holes.

[0017] The present application has the following beneficial effects by using the above technical solutions:

[0018] 1. The experimental device of the present application does not require a special test site or test bed. The experimental device is a self-balancing force system, and the force during the test can be self-balanced by its structure. It does not need to transfer the force applied during the test to other objects (or facilities), and teaching departments without test beds or special structural test rooms can also carry out similar experimental teaching activities.

[0019] 2. The experimental device of the present application has low requirements for the test site and does not require a special test bed. It only needs to be placed on a flat site to carry out the test, and it can also be tested outdoors. It is especially suitable for schools without special structural test rooms to carry out related experimental teaching, such as vocational and technical colleges.

[0020] 3. The experimental device of the present application is light in weight, and the self-weight of a set of device does not exceed 400 kg. One person can move it in any direction on a flat site, unlike the prior art which requires special lifting equipment to move it.

[0021] 4. The device occupies a small space, and each device occupies an area of about 2.5 m 2 , which is much smaller than the prior art equipment (about 10 m 2 ). Multiple sets can be used for group experimental teaching, and they can be moved and stored together after the test to release the test site space.

[0022] 5. The storage condition requirement is low. The main structure is a steel structure, which can exist outdoors after reasonable corrosion treatment, and does not require a special indoor storage site.

[0023] 6. The device has multiple functions. It can be used for reinforced concrete beam test and steel truss test, and can be used for single-point loading or two-point loading. It can also be moved up and down to adjust the height of the end support installation to meet the test requirements. It can be moved in any direction, and the walking roller uses a universal roller.

[0024] 7. The test loading workload is small, and a small manual jack can be used to realize loading. One experimental operator can complete the loading operation.

[0025] 8. The test accuracy is high. The loading device uses a jack with a pressure sensor, and the loading accuracy can reach 0.5%, which is much higher than the 5% accuracy of the existing technology that only uses a jack for loading;

[0026] 9. To meet the existing experimental teaching requirements, this device is mainly aimed at the experimental teaching of bending members. Therefore, the maximum loading capacity is designed to be 100~300kN;

[0027] 10. The cost is low. The beams, columns and base are made of ordinary I-shaped steel, which is simple to make. According to the current market price, the cost is about 10,000 yuan per set. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of the experimental device of the present invention;

[0029] Figure 2 It is a structural diagram of the distribution support of the experimental device in the present invention;

[0030] Figure 3 It is a structural schematic diagram of the test piece support of the experimental device in the present invention;

[0031] In the accompanying drawings, there are base 1, walking mechanism 2, column 3, fixing screw hole 31, specimen support 4, second positioning bolt 41, second positioning ear plate 42, second roller 43, support plate 44, rib plate 45, connecting plate 46, beam 5, loading mechanism 6, pressure sensor 61, hydraulic jack 62, distribution beam 63, distribution support 64, first positioning bolt 71, first positioning ear plate 72, first roller 73, first base 74, and specimen 7. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention will be described in further detail. However, it should be noted that these embodiments are provided only to make the present invention more thorough and complete, and that many of the details listed in the specification are merely intended to help readers gain a thorough understanding of one or more aspects of the present invention. These aspects of the present invention can be implemented even without these specific details.

[0033] like Figure 1 The portable experimental teaching device for bending members shown in the figure includes a base 1, a traveling mechanism 2, a column 3, a specimen support 4, a crossbeam 5 and a loading mechanism 6. The traveling mechanism 2 is arranged below the base 1, the column 3 is fixedly arranged on the base 1, the crossbeam 5 spans above the column 3 and forms a portal frame with the column 3, the specimen support 4 is movably arranged on the column 3, and the specimen 7 is fixed in the portal frame. The loading mechanism 6 is arranged above the specimen 7 and is located below the crossbeam 5 to apply a load force to the specimen.

[0034] The base 1 is horizontally arranged, and two bases are arranged at two sides of the bottom of the door frame; the walking mechanism 2 is a universal wheel, and four universal wheels are arranged on the bottom of the base by bolts to form a walking mechanism for driving the whole device; the column 3 is vertically welded on the top of the base 1, and the two ends of the cross beam 5 are transversely welded on the top of the column 3.

[0035] The loading mechanism 6 comprises a pressure sensor 61, a hydraulic jack 62, a distribution beam 63 and a distribution support 64, the pressure sensor 61 is arranged below the cross beam 5 and at the middle of the cross beam 5, the hydraulic jack 62 is arranged below the pressure sensor 61, the distribution beam 63 is arranged below the hydraulic jack, and the distribution support 64 is arranged on the test piece 7 and fixed below the distribution beam 63; the distribution beam 63 is a steel piece with an I-shaped cross section, and the hydraulic jack 62 is arranged at the middle of the distribution beam 63 to apply uniform load to the test piece.

[0036] As shown in Figure 2 The distribution support 64 comprises a first positioning bolt 71, a first positioning ear plate 72, a first roller 73 and a first base 74, the first positioning ear plate 72 is arranged in parallel above the first base 74, the first roller 73 is fixed at the middle of the two first positioning ear plates 72, and the first positioning ear plate 72 and the first roller 73 are fixed by cooperating with the first positioning bolt 71 through the screw holes arranged on the first positioning ear plate 72.

[0037] As shown in Figure 3 The test piece support 4 comprises a second positioning bolt 41, a second positioning ear plate 42, a second roller 43, a support plate 44, a rib plate 45 and a connecting plate 46, the connecting plate 46 is vertically arranged on the side edge of the test piece support 4 and fixedly connected with the column, the support plate 44 is horizontally welded on the side of the connecting plate 46, the rib plate 45 is welded on the lower side of the support plate 44 to support the support plate 44, the second positioning ear plate 42 is arranged in parallel on the support plate 44, and the second roller 43 is arranged between the second positioning ear plates 42 and fixed by cooperating with the second positioning bolt 41 through the screw holes arranged on the second positioning ear plate 42.

[0038] The test piece support 4 is screwed and fixed on the column by cooperating with the screw holes and the bolts; the inner side of the column 3 is provided with a plurality of rows of fixed screw holes 31, and the position of the test piece is determined by fixing the test piece support 4 on different screw holes.

[0039] The force of the experimental device during the test can be self-balanced by its structure, and the force applied during the test does not need to be transmitted to other objects. During the test, the jack applies a positive downward force, or the distribution beam 63 applies a positive force to the test piece, so that the test piece is positively bent downward, and the size of the force is measured by the pressure sensor 61 on the upper part of the jack. The counterforce of the hydraulic jack 62 is transmitted to the upper cross beam 5, and the cross beam 5 transmits the force to the two end columns, so that the upper end of the column 3 bears an upward force. When the test piece 7 is subjected to the downward force of the jack, the force is transmitted to the test piece support 4 at both ends, and the test piece support 4 is transmitted to the two end columns 3, so that the column 3 bears a downward force at the test piece support 4. According to the mechanical relationship, the force is equal in size and opposite in direction to the upward force borne by the upper end of the column, and is self-balanced by tension. In addition, the column 3 also bears an eccentric moment, which can be balanced by the bending resistance of the column itself, so it is a self-balancing force system.

[0040] The components of the experimental device are:

[0041] The cross beam 5 is used to bear the counterforce of the test hydraulic jack 62, and the hydraulic jack 62 can be installed. The cross beam is located at the uppermost part of the test device and is placed horizontally. It is made of ordinary I-shaped cross-section section steel and is welded and connected to the upper ends of the left and right columns.

[0042] The column 3 is used to transmit the counterforce borne by the cross beam 5 and is made of ordinary I-shaped cross-section section steel. The left and right columns are welded and connected to the lower sides of the two ends of the cross beam 5. Two rows of screw holes are arranged in the flanges of the I-shaped cross-section section in the middle and lower parts of the column 3. Each row is evenly arranged with 7 screw holes, and the lowermost row of screw holes is 250mm away from the base. The test piece support 4 is installed to move up and down along the column 3, so that the position of the test piece installation can be adjusted along the height.

[0043] The pressure sensor 61 is installed between the hydraulic jack 62 and the cross beam 5, and is used to measure the size of the force applied by the jack, which is 100-200kN, and is purchased from the market standard product.

[0044] The hydraulic jack 62 is installed in the middle of the cross beam 5 and is used to apply load to the test piece, which is 100-200kN, and is purchased from the market standard product.

[0045] The distribution beam 63 is used to distribute the concentrated force applied by the jack into two concentrated forces of the same size when needed, and can not be used when not needed. At this time, a concentrated force is directly applied to the test piece by the jack. The distribution beam 63 is made of ordinary I-shaped cross-section section steel.

[0046] The distribution support 64 is like Figure 2As shown, the distribution support is used to rationally transmit the two concentrated forces generated by the distribution beam 63 to the specimen 7 and is placed directly on the corresponding position of the specimen. It consists of a first positioning bolt 71, a first positioning lug 72, a first roller 73, and a first base 74. Four first positioning lugs are welded to the first base 74. Each first positioning lug 72 has a screw hole and is equipped with a first positioning bolt 71. The first roller 73 is placed between the four first positioning bolts 71. By tightening or loosening the first positioning bolts 71, the first roller 73 can be placed in a non-rolling or rolling state, thereby being adjustable as needed to form a fixed hinge support or a movable hinge support to meet the mechanical requirements of bending member testing.

[0047] Specimen support 4, such as Figure 3 As shown, the specimen support 4 is used to transmit the reaction force of the specimen support at both ends of the bending member to the left and right columns. Its position can be moved along the height direction of the column 3 to adapt to different specimen installation position requirements. The specimen support 4 consists of 6 parts: a second positioning bolt 41, a second positioning ear plate 42, a second roller 43, a support plate 44, a rib plate 45, and a connecting plate 46. Among them, the second positioning bolt 41, the second positioning ear plate 42, and the second roller 43 are made in the same way as the distribution support 64, but the four positioning ear plates are welded to the support plate 44, and each second positioning ear plate 42 is provided with a screw hole, and each second positioning ear plate 42 is equipped with a second positioning bolt 41; the support plate 44 is made of a 10mm thick rectangular steel plate, placed horizontally, and four positioning ear plates are welded thereon; the rib plate 45 is made of a 10mm thick trapezoidal steel plate, placed vertically, and its two right-angled sides are welded to the support plate 44 and the connecting plate 46 respectively; the connecting plate 46 is made of a 10mm thick trapezoidal steel plate, placed vertically, and its axis is welded to a vertical side of the support plate 44, and two screw holes are arranged symmetrically on both sides of the central axis, with a top-bottom spacing of 160mm and a left-right spacing of 80mm. The specimen support 4 as a whole is connected to the inner flange of the column through these four screw holes with four bolts. The same principle as the distribution support is used. The second roller 43 is placed between the four second positioning bolts. By tightening or loosening the second positioning bolts to fix the second roller 43, the second roller 43 can be placed in a non-rolling or rolling state, so that it can be adjusted to a fixed hinge support and a movable hinge support as needed to meet the mechanical requirements of the bending member test.

[0048] Base 1 is used to keep the test device in a vertical working state and bear the weight of the test device, test piece, and jack. It is made of ordinary I-section steel with the weak axis of the section placed horizontally. Base 1 is welded to the bottom of the left and right columns respectively. Two sets of screw holes are opened on the web of the I-section base, four in each set for installing the travel rollers;

[0049] The walking mechanism 2 is installed at the bottom of the base, and is used as the walking mechanism of the device. The walking rollers are universal rollers, and the device can be moved in any direction on a flat ground by manpower. The universal rollers are standard products in the market, and are connected to the base by bolts. When the universal rollers are worn, they can be replaced at any time.

[0050] The effects of the components of the device are as follows:

[0051] 1. The overall structure of the device is a portal steel frame, which is a portal structure formed by welding a cross beam, a column and a base. The cross beam, the column and the base are made of ordinary I-shaped steel, which is simple to manufacture and low in cost. The device solves the problems of complex manufacturing process and high cost in the prior art.

[0052] 2. In the self-balancing structure of the device, the force applied during the test is balanced by the structure itself, and does not need to be transmitted to other objects (or facilities). Therefore, it does not require a test base. In the prior art, the force applied needs to be transmitted to the test base, and therefore a special test base is required, which is not a self-balancing structure.

[0053] 3. Each of the left and right columns is internally provided with a test piece support. Two rows of screw holes are arranged in the flanges of the I-shaped cross section at the lower inner side of the column. The test piece support is connected to the inner side of the column by bolts, and the installation position is adjustable in height.

[0054] 4. The base is provided with a walking mechanism, and the base is provided with universal rollers, which can be moved in any direction on the ground. Unlike the prior art, the device can only be moved within a certain range, such as within the range of the test base.

[0055] 5. The device can be moved in any direction on a flat ground by manpower, and does not need to be moved by lifting equipment. The device is light in weight, and the self-weight of the device designed according to the maximum loading capacity does not exceed 400 kg. Unlike the prior art, the device needs to be moved by special lifting equipment.

[0056] 6. A distribution support 64 is arranged between the distribution beam 63 and the test piece 7. When single-point loading is performed, the distribution beam is not required, and the distribution support 64 is not required. The distribution support 64 is composed of a first positioning bolt 71, a first positioning ear plate 72, a first roller shaft 73 and a first base 74. The first positioning ear plate has four first positioning ear plates 72, which are welded to the base plate. Each first positioning ear plate 72 is provided with a screw hole, and is provided with a first positioning bolt 71. The first roller shaft 73 is arranged between the four first positioning bolts. By tightening or loosening the positioning bolts, the roller shaft can be in a state of being unable to roll or being able to roll. Therefore, the fixed hinge support and the movable hinge support can be adjusted as needed to meet the mechanical requirements of the bending member test. Unlike the existing support technology, the fixed hinge support and the movable hinge support cannot be adjusted and used universally.

[0057] 7. The test piece support 4 is adjustable in height, and the end support is composed of a distribution support 64 part (not including the bottom plate), a support plate 44, a rib plate 45, a connecting plate 46, etc., wherein the second positioning bolt 41, the second positioning lug plate 42, and the second roller shaft 43 are the same as the distribution support 64. However, the four second positioning lug plates are welded on the support plate 44, each second positioning lug plate 42 has a threaded hole, and each second positioning lug plate 42 is matched with a second positioning bolt 41; the support plate 44 is made of a 10mm thick rectangular steel plate, which is placed horizontally, and four second positioning lug plates 42 are welded thereon; the rib plate 45 is made of a 10mm thick trapezoidal steel plate, which is placed vertically, and two straight edges are welded with the support plate and the connecting plate, respectively; the connecting plate 46 is made of a 10mm thick trapezoidal steel plate, which is placed vertically, and the axis is welded with a vertical edge of the support plate, and two screw holes are arranged symmetrically on both sides of the central axis, with an upper and lower distance of 160mm and a left and right distance of 80mm, and the support is connected with the inner side flange of the stand through the four bolts, which can be disassembled. The end support has the same functions of adjusting the fixed hinge support and the movable hinge support as the distribution support 64.

[0058] 8. There is a loading device between the distribution beam 63 and the pressure sensor 61, which is an integrated manual hydraulic jack 62, and the maximum loading capacity is designed to be 100-300kN; the pressure sensor 61 is installed between the loading device and the cross beam, and the accuracy can reach 0.5%; the area occupied by each device is about 2.5m2, which is much smaller than the existing technology device (more than about 10m2), and multiple sets of devices can be used for grouped experimental teaching, and can be moved together after the test to save space; the steel reinforced concrete beam and the steel truss can be tested, and single-point loading and two-point loading can be performed.

[0059] The above only describes the preferred embodiments of the present application, and it should be noted that for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A portable experimental teaching device for bending members, characterized by: The test specimen comprises a base, a traveling mechanism, a column, a specimen support, a crossbeam, and a loading mechanism. The traveling mechanism is arranged below the base, the column is fixedly arranged on the base, the crossbeam spans above the column and forms a portal frame with the column, the specimen support is movably arranged on the column, and both sides of the specimen are fixed to the specimen support and located in the portal frame, and the loading mechanism is arranged above the specimen and below the crossbeam to apply a load force to the specimen. The loading mechanism includes a pressure sensor, a hydraulic jack, a distribution beam and a distribution support. The pressure sensor is installed below the crossbeam and located in the middle of the crossbeam. The hydraulic jack is installed below the pressure sensor. The distribution beam is located below the hydraulic jack. The distribution support is installed on the specimen and fixed below the distribution beam. The distribution support includes a first positioning bolt, a first positioning ear plate, a first roller and a first base. The first positioning ear plates are provided in two pieces and are fixed in parallel above the first base. The first roller is fixed between the two first positioning ear plates. The first positioning ear plates and the first roller are fixed by screw holes provided on the first positioning ear plates and engaged with the first positioning bolts. The specimen support includes a second positioning bolt, a second positioning ear plate, a second roller, a support plate, a rib plate and a connecting plate. The connecting plate is vertically arranged on the side of the specimen support and fixedly connected to the column. The support plate is horizontally welded on the side of the connecting plate. The rib plate is simultaneously welded perpendicular to the support plate and the connecting plate and is welded below the support plate to support the support plate. The second positioning ear plate is arranged parallel to the support plate, and the second roller is arranged between the second positioning ear plates and is fixed to the second positioning bolt by setting screw holes on the second positioning ear plates.

2. The portable flexural member experimental teaching device according to claim 1, characterized in that: The base is arranged horizontally, and there are two bases which are respectively arranged on both sides of the bottom of the door frame.

3. The portable flexural member experimental teaching device according to claim 2, characterized in that: The traveling mechanism is a universal wheel, which has four wheels in total and is fixed to the bottom of the base by bolts to form a traveling mechanism that drives the entire device.

4. The portable flexural member experimental teaching device according to claim 1, characterized in that: There are two upright columns which are respectively vertically welded on the top of the base, and two ends of the crossbeam are welded across the top ends of the upright columns.

5. The portable flexural member experimental teaching device according to claim 1, characterized in that: The distribution beam is a steel piece with an I-shaped cross section, and the hydraulic jack is located in the middle of the distribution beam to apply load to the test piece.

6. The portable flexural member experimental teaching device according to claim 1, characterized in that: The test piece support is fixed by screwing in screw holes provided on the column.

7. The portable flexural member experimental teaching device according to claim 6, characterized in that: Several rows of fixing screw holes are provided on the inner side of the column, and the position of the test piece is determined by fixing the test piece support on different screw holes.

Images