Clamp for measuring bending property of concrete test piece

Abstract

The utility model relates to a clamp for measuring the bending property of a concrete test piece, which belongs to the technical field of material mechanical property testing tools and comprises a base. The supporting seats are mounted on the base, supporting rollers are mounted at the top ends of the supporting seats, the two supporting seats are distributed left and right, and a concrete test piece to be tested is lapped on the two supporting rollers; the bottom end of the loading distribution beam is provided with a compression roller, the compression roller is pressed on the concrete test piece to be tested, and the compression roller is located between the two supporting rollers; the linear motor is provided with a movable sliding table, the linear motor is installed on the base and located between the two supporting seats, and the sliding direction of the movable sliding table is the front-back direction; and the displacement meter is mounted on the movable sliding table. The clamp not only can be used for measuring the deformation quantity of the concrete test piece when the concrete test piece is pressed so as to obtain the bending property of the concrete test piece, but also can conveniently move the displacement meter so as to obtain more measurement data, so that a more accurate measurement result is obtained.

Description

Technical Field

[0001] The utility model belongs to the technical field of tooling for testing mechanical properties of materials, in particular to a fixture for measuring the bending properties of concrete test pieces. Background Art

[0002] When measuring the bending properties of concrete specimens, a three-point or four-point fixture is typically used to measure the bending displacement of the concrete specimen under bending. The test specimen is placed on two support rollers, with the center of the specimen suspended in the air. A load is then applied to the center of the specimen using a distribution beam and compression rollers. Finally, a displacement meter is used to measure the deformation of the specimen under compression from the suspended area below the center of the specimen.

[0003] Traditional three-point or four-point fixtures have a fixed span, so when measuring different test blocks, the fixture needs to be replaced. To facilitate measuring different test blocks, some measuring fixtures with adjustable spans have emerged in the prior art, such as the fixture for measuring the bending properties of fiber-reinforced concrete specimens disclosed in utility model patent application number 201720214854.9.

[0004] Although the current span-adjustable fixture can be used to measure specimens of different sizes, the displacement meter still needs to be moved manually during the measurement process, which not only affects the measurement accuracy but also makes movement inconvenient. Utility Model Content

[0005] The utility model provides a fixture for measuring the bending performance of a concrete test piece, which is used to solve the technical problem that such fixtures with adjustable span in related technologies still require manual movement of a displacement meter.

[0006] The utility model is realized by the following technical solution: a fixture for measuring the bending properties of concrete specimens, comprising:

[0007] base;

[0008] A support seat is mounted on the base, a support roller is rotatably mounted on the top of the support seat, and there are two support seats, one on the left and one on the right, and the concrete specimen to be tested is overlapped on the two support rollers;

[0009] a loading distribution beam for connecting the pressure device, wherein a pressure roller is installed at the bottom end of the loading distribution beam, the pressure roller presses on the concrete specimen to be tested, and the pressure roller is located between the two support rollers;

[0010] A linear motor having a movable slide, wherein the linear motor is mounted on the base and located between the two support seats, and the sliding direction of the movable slide is a front-to-back direction;

[0011] A displacement meter is installed on the movable slide and is used to measure the deformation of the concrete specimen under pressure.

[0012] Furthermore, in order to better implement the present invention, a mounting block is mounted on the movable slide, and a mounting hole is provided on the top surface of the mounting block;

[0013] An electric telescopic rod is installed in the installation hole, with the telescopic axis of the electric telescopic rod facing upward;

[0014] A mounting platform is mounted on the telescopic shaft of the electric telescopic rod, so as to utilize the electric telescopic rod to drive the mounting platform to rise and fall;

[0015] The displacement meter is mounted on the mounting platform.

[0016] Furthermore, in order to better implement the present invention, a positioning guide hole is provided on the top surface of the mounting block;

[0017] A positioning guide rod is fixedly provided on the bottom surface of the mounting platform, and the positioning guide rod is inserted into the positioning guide hole in an up-and-down sliding manner.

[0018] Furthermore, in order to better implement the present invention, the base includes:

[0019] a first straight plate, the linear motor being mounted on the first straight plate;

[0020] The second straight plate is fixedly provided at the middle of both sides of the first straight plate. The first straight plate and two second straight plates form a "cross" structure. Each second straight plate is equipped with a support seat.

[0021] Furthermore, in order to better implement the present invention, the base further includes:

[0022] A side plate is fixedly connected to the left and right edges of the first straight plate, and the side plate is arranged between the linear motor and the support seat.

[0023] Furthermore, in order to better implement the present invention, the following is also included:

[0024] A silicone sheet, wherein a vertical plate is fixedly provided at both the front and rear ends of the first straight plate, the silicone sheet being fixedly connected between the top ends of the two vertical plates, and the top surface of the silicone sheet being in contact with the bottom surface of the concrete specimen to be tested, and the silicone sheet being used to cover cracks that appear when the concrete specimen to be tested is deformed under pressure;

[0025] The two vertical plates, the two side plates and the first straight plate form a mounting groove, and the linear motor is accommodated in the mounting groove.

[0026] Further, to better implement the present utility model, the support base includes:

[0027] A rectangular block, installed on the second straight plate and arranged in the left - right direction, one end of the rectangular block abuts against the side plate;

[0028] A support block, the support roller is rotatably installed on the top end of the support block, and the support block is slidably installed on the rectangular block in the left - right direction;

[0029] A locking component, installed between the support block and the rectangular block, and the locking component is used to lock the support block to the rectangular block.

[0030] Further, to better implement the present utility model, a first through - groove is opened on the top surface of the rectangular block, and a second through - groove is opened in the middle of the rectangular block. The first through - groove and the second through - groove communicate to form a "丄" - shaped groove;

[0031] A horizontal convex block is provided at the bottom end of the support block, the horizontal convex block is lapped on the rectangular block, and a through - hole is opened on the horizontal convex block;

[0032] The locking component includes a stud and a nut. A lock block is fixedly provided at one end of the stud, the lock block is slidably placed in the second through - groove, the stud is slidably placed in the first through - groove, and the stud passes through the through - hole and is screwed with the nut;

[0033] When locking, the nut and the lock block clamp the horizontal convex block and the rectangular block.

[0034] Further, to better implement the present utility model, the lock block is an oval plate. One end of the stud is fixedly connected to the center position of the oval plate. The width of the oval plate is the same as the outer diameter of the stud, and the length of the oval plate is greater than the width of the first through - groove and less than the width of the second through - groove.

[0035] Further, to better implement the present utility model, a scale is also provided on the outer side wall of the rectangular block.

[0036] The present utility model has the following beneficial effects compared with the prior art:

[0037] The fixture for measuring the bending performance of a concrete specimen provided by the utility model includes a base, a support base, a loading distribution beam, a linear motor and a displacement meter. The support base is installed on the base, and a support roller is rotatably installed on the top end of the support base. There are two support bases, and the two support bases are distributed one on the left and the other on the right. The concrete specimen to be measured is overlapped on the two support rollers. The loading distribution beam is used to connect the pressure device. A pressure roller is installed at the bottom end of the loading distribution beam. The pressure roller presses on the concrete specimen to be measured, and the pressure roller is located between the two support rollers. The linear motor has a movable slide. The linear motor is installed on the base and is located between the two support seats. The sliding direction of the movable slide is the front-back direction. The displacement meter is installed on the movable slide. The displacement meter is used to measure the deformation amount of the concrete specimen to be measured when it is under pressure.

[0038] During use, the concrete specimen to be tested is placed on two support rollers, with the middle of the concrete specimen suspended in the air. A loading distribution beam is then placed on the concrete specimen, so that the pressure roller contacts the top surface of the concrete specimen. A pressure device is then used to apply pressure to the loading distribution beam, thereby applying pressure to the concrete specimen, causing the concrete specimen to deform. A displacement meter is then mounted on a moving slide of a linear motor. The linear motor drives the moving slide to move the displacement meter below the concrete specimen, so that the displacement meter contacts the bottom wall of the concrete specimen. The displacement meter is then used to measure the deformation of the concrete specimen under pressure, thereby determining the bending performance of the concrete specimen. Furthermore, during the measurement process, the linear motor can be used to drive the displacement meter to move in the front-to-back direction, thereby measuring the compressive deformation of the concrete specimen at different points.

[0039] Through the above structure, the fixture for measuring the bending performance of concrete specimens provided by the utility model can not only be used to measure the deformation of the concrete specimen when it is under pressure, thereby obtaining the bending performance of the concrete specimen, but also can conveniently move the displacement meter to obtain more measurement data, thereby obtaining more accurate measurement results. Moreover, the linear motor drives the displacement meter to move, and the movement is more stable and easy to control. Therefore, the practicality of the fixture for measuring the bending performance of concrete specimens is stronger. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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.

[0041] Figure 1 This is a schematic structural diagram of a fixture for measuring the bending properties of a concrete specimen provided by an embodiment of the present utility model;

[0042] Figure 2 yes Figure 1 A front view of a fixture for measuring the bending properties of concrete specimens is shown;

[0043] Figure 3 yes Figure 1 Exploded view of the fixture for measuring the flexural properties of concrete specimens shown;

[0044] Figure 4 It is a structural schematic diagram of the base in an embodiment of the present utility model;

[0045] Figure 5 It is a structural schematic diagram of the support base in an embodiment of the utility model;

[0046] Figure 6 yes Figure 5 An exploded view of the support base is shown;

[0047] Figure 7 yes Figure 5 A side view of the support base shown;

[0048] Figure 8 It is a structural diagram of the mounting block in an embodiment of the present utility model;

[0049] Figure 9 It is a structural schematic diagram of the mounting platform in an embodiment of the present utility model.

[0050] In the picture:

[0051] 100-base, 110-first straight plate, 120-second straight plate, 130-side plate, 140-vertical plate, 200-support seat, 210-support roller, 220-rectangular block, 221-first through slot, 222-second through slot, 223-scale, 230-support block, 231-horizontal protrusion, 232-through hole, 240-locking assembly, 241-stud, 242-nut, 243-locking block, 300-concrete specimen to be tested, 400-loading distribution beam, 410-pressure roller, 500-linear motor, 510-moving slide, 600-displacement meter, 700-mounting block, 710-mounting hole, 720-positioning guide hole, 800-electric telescopic rod, 900-mounting table, 910-positioning guide rod, 1000-silicone sheet. DETAILED DESCRIPTION

[0052] To make the purpose, technical solution, and advantages of the present invention more clear, the technical solution of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0053] It should be noted that the concepts of up, down, left, right, front, and back in this embodiment are based on the Figure 2 The top, bottom, left, right, front and back shown in the table shall prevail. Specifically, Figure 2 The upper part shown in is the top. Figure 2 The bottom shown in is the bottom, Figure 2 The left side shown in is the left, Figure 2 The right side of the is right, Figure 2 The end that extends into the paper is the front. Figure 2 The end that extends out of the paper is the back.

[0054] Example:

[0055] like Figures 1 to 9 As shown, the fixture for measuring the bending properties of concrete specimens provided in this embodiment includes a base 100, a support base 200, a load distribution beam 400, a linear motor 500 and a displacement meter 600, wherein:

[0056] The support seat 200 is mounted on the base 100, and a support roller 210 is rotatably mounted on the top of the support seat 200. Specifically, the support roller 210 is rotatably mounted on the top of the support seat 200 via a connecting member, which includes a connecting plate and a locking screw. Screw holes are provided on the upper side wall of the support seat 200, and a through hole is provided on the connecting plate. The locking screw passes through the through hole and is screwed to the screw hole. The above-mentioned connecting plate is installed on both sides of the support seat 200 via locking screws. The connecting plate has a circular hole. Round shafts are provided at both ends of the support roller 210. The circular shafts at both ends are rotatably inserted into the circular holes on the two connecting plates. In addition, an arc groove is also provided on the top surface of the support seat 200, and the support roller 210 is rotatably placed in the arc groove. There are two support seats 200, one on the left and one on the right. The top of each support seat 200 is equipped with the above-mentioned support roller 210. The concrete specimen 300 to be tested is overlapped on the two support rollers 210 .

[0057] The loading distribution beam 400 is used to connect a pressure device. The pressure device is the same as that in the prior art, so it will not be described in detail here. A pressure roller 410 is installed at the bottom end of the loading distribution beam 400. The installation method of the pressure roller 410 on the loading distribution beam 400 is the same as the installation method of the support roller 210 on the support seat 200. The pressure roller 410 presses on the concrete specimen 300 to be tested, and the pressure roller 410 is located between the two support rollers 210.

[0058] The linear motor 500 includes a movable slide 510. The linear motor 500 is mounted on the base 100 and positioned between the two support blocks 200. The movable slide 510 slides forward and backward. A displacement meter 600 is mounted on the movable slide 510. The displacement meter 600 is used to measure the deformation of the concrete specimen 300 under pressure. The linear motor 500 drives the displacement meter 600 to move forward and backward, thereby moving the displacement meter 600 to or from the area below the middle of the concrete specimen under test. Alternatively, the displacement meter 600 may be a micrometer or a displacement sensor with a probe.

[0059] During use, the concrete specimen 300 to be tested is placed on two supporting rollers 210 so that the middle part of the concrete specimen 300 to be tested is suspended in the air, and then the loading distribution beam 400 is placed on the concrete specimen 300 to be tested so that the pressure roller 410 contacts the top surface of the concrete specimen 300 to be tested, and then the pressure-applying device is used to apply pressure on the loading distribution beam 400, thereby applying pressure to the concrete specimen 300 to be tested, thereby causing the concrete specimen 300 to be deformed, and then the displacement meter 600 is installed on the movable slide 510 of the linear motor 500, and then the linear motor 500 drives the movable slide 510 to drive the displacement meter 600 to move to the bottom of the concrete specimen 300 to make the displacement meter 600 contact the bottom wall of the concrete specimen 300 to measure the deformation of the concrete specimen 300 to be tested by the displacement meter 600, and then the bending performance of the concrete specimen is obtained. Moreover, during the measurement process, the linear motor 500 can be used to drive the displacement meter 600 to move in the front-rear direction, thereby measuring the compressive deformation of the concrete specimen at different points.

[0060] Through the above-described structure, the fixture for measuring the bending properties of concrete specimens provided in this embodiment can not only be used to measure the deformation of the concrete specimen when under compression, thereby determining the bending properties of the concrete specimen, but also conveniently move the displacement meter 600 to obtain more measurement data, thereby obtaining more accurate measurement results. Furthermore, the linear motor 500 drives the displacement meter 600, resulting in smoother movement and easier control. Therefore, the fixture for measuring the bending properties of concrete specimens is more practical. Of course, if the measurement position is to be moved left or right, the concrete specimen 300 to be tested can be dragged left or right. It should be noted that the axial directions of the support roller 210 and the pressure roller 410 are both in the front-to-back direction.

[0061] Of course, it also includes a power supply and a controller. The controller can be a circuit board or chip. The power supply and the linear motor 500 are electrically connected to the controller. Of course, the controller can also be integrated with a signal receiving module to facilitate remote control. In this way, the user can remotely control the operating status of the linear motor 500 and thus control the position of the movable slide 510 and the displacement meter 600.

[0062] An optional implementation of this embodiment is as follows: a mounting block 700 is mounted on the movable slide 510 of the linear motor 500. A mounting hole 710 is defined on the top surface of the mounting block 700. An electric telescopic rod 800 is mounted in the mounting hole 710, with the telescopic axis of the electric telescopic rod 800 facing upward. A mounting platform 900 is mounted on the top end of the telescopic axis of the electric telescopic rod 800. The electric telescopic rod 800 is then used to drive the mounting platform 900 to rise and fall, and the displacement meter 600 is mounted on the mounting platform 900. In this way, the electric telescopic rod 800 can be used to drive the displacement meter 600 to rise and fall, thereby facilitating the assembly and disassembly of the displacement meter 600 during measurement. Specifically, during the measurement process, the type and model of the displacement meter 600 may sometimes be incorrect, so the displacement meter 600 needs to be disassembled during the measurement process. When the displacement meter 600 needs to be disassembled during the measurement process, the electric telescopic rod 800 is used to drive the displacement meter 600 to the lowest point. At this time, the displacement meter 600 will not contact the concrete specimen 300 to be measured. At this time, the displacement meter 600 can be removed from the mounting platform 900, and then a suitable displacement meter 600 is installed. Finally, the electric telescopic rod 800 is used to drive the displacement meter 600 to the appropriate position. Of course, the displacement meter 600 can be driven up and down using the electric telescopic rod 800 to produce other desired effects.

[0063] The electric telescopic rod 800 is electrically connected to the controller, so that the controller can be used to control the operating state of the electric telescopic rod 800. Moreover, the lifting and lowering of the electric telescopic rod 800 can also be remotely controlled.

[0064] In order to make the raising and lowering of the mounting platform 900 more precise, in this embodiment, a positioning guide hole 720 is further opened on the top surface of the mounting block 700, and a positioning guide rod 910 is fixedly provided on the bottom surface of the mounting platform 900. The positioning guide rod 910 is inserted into the positioning guide hole 720 for sliding movement. Optionally, there are four positioning guide holes 720, and the four positioning guide holes 720 are evenly distributed around the mounting hole 710. Of course, correspondingly, there are also four positioning guide rods 910, and the four positioning guide rods 910 are inserted into the four positioning guide holes 720 in a one-to-one correspondence.

[0065] An optional implementation of this embodiment is as follows: the base 100 includes a first straight plate 110 and a second straight plate 120, wherein:

[0066] The second straight plate 120 is integrally formed with the first straight plate 110, and one end of the second straight plate 120 is connected to the middle of the side wall of the second straight plate 120. There are two second straight plates 120, and the two second straight plates 120 are respectively located on both sides of the first straight plate 110, so that the first straight plate 110 and the two second straight plates 120 form a "cross" structure.

[0067] The linear motor 500 is bolted to the first straight plate 110 , and the two support bases 200 are bolted to the second straight plate 120 , respectively.

[0068] In order to separate the support seat 200 and the linear motor 500, the base 100 in this embodiment also includes two side panels 130, which are respectively fixed to the left and right edges of the first straight plate 110. The side panels 130 are arranged between the linear motor 500 and the support seat 200, so that the linear motor 500 is protected from the side by the side panels 130.

[0069] Preferably, a vertical plate 140 is fixed to each of the front and rear sections of the first straight plate 110. The top of the vertical plate 140 is higher than the side plate 130 and is flush with the top of the support roller 210. A silicone sheet 1000 is installed between the tops of the two vertical plates 140. The silicone sheet 1000 has good elasticity and toughness, and the top surface of the silicone sheet 1000 is in contact with the bottom surface of the concrete to be measured. In this case, the displacement meter 600 is located directly below the silicone sheet 1000 and contacts the bottom surface of the silicone sheet 1000.

[0070] Because some concrete specimens 300 to be tested may be cracked due to pressure during measurement, the probe of the displacement meter 600 may become stuck in the cracks during measurement, thereby affecting measurement contact and potentially damaging the displacement meter 600. The fixture for measuring the bending properties of concrete specimens provided in this embodiment uses a silicone sheet 1000 to cover the cracks from below. The probe of the displacement meter 600 contacts the bottom surface of the silicone sheet 1000, thus effectively preventing the probe of the displacement meter 600 from entering the cracks created by the pressure of the concrete specimen 300 to be tested.

[0071] During measurement, the concrete specimen 300 is compressed, causing its center to bend downward. Because the silicone sheet 1000 is in contact with the bottom surface of the concrete specimen 300, it also deforms downward by an equal amount. Using the displacement meter 600 to measure the deformation of the silicone sheet 1000, the deformation of the concrete specimen 300 under compression can be determined. Of course, the pressure applied by the pressure device must be greater to overcome the elastic force of the silicone sheet 1000. When the concrete specimen 300 is removed from the support roller 210, the silicone sheet 1000, due to its excellent elasticity, will return to its original position.

[0072] Of course, the silicone sheet 1000 may not be installed. In this case, the probe of the displacement meter 600 is directly in contact with the bottom wall of the concrete specimen 300 to be tested.

[0073] An optional implementation of this embodiment is as follows: the support base 200 includes a rectangular block 220, a support block 230 and a locking assembly 240, wherein:

[0074] The rectangular block 220 has a length direction and a width direction. The length direction of the rectangular block 220 is the left-right direction, and one end of the rectangular block 220 in the left-right direction abuts against the side plate 130. The rectangular block 220 is bolted to the second straight plate 120.

[0075] The above-mentioned support block 230 is installed on the above-mentioned rectangular block 220 in a left-right sliding manner, and the support roller 210 is rotatably installed at the top end of the support block 230 through a connecting member. In this way, the support block 230 can move in the left-right direction, so that the two support rollers 210 approach or move away from each other, and further facilitate adjusting the span between the two support rollers 210 according to the size of the concrete test piece 300 to be measured, so that the fixture for measuring the bending performance of the concrete test piece provided in this embodiment is applicable to more sizes of concrete test pieces 300 to be measured. Moreover, during the measurement process, the position of the concrete test piece 300 to be measured in the left-right direction can also be moved by adjusting the position of the support base 200 in the left-right direction, so that the probe of the displacement meter 600 contacts the lowest part of the concrete test piece 300 to be measured, or the probe of the displacement meter 600 measures the deformation of other positions of the concrete test piece 300 to be measured.

[0076] Of course, when the span between the two support rollers 210 is adjusted to be appropriate, or when the concrete test piece 300 to be measured is moved to an appropriate position, the locking component 240 is used to lock the support base 200 on the rectangular block 220.

[0077] Optionally, the above-mentioned locking component 240 includes a stud 241 and a nut 242, and a locking block 243 is fixedly provided at one end of the stud 241.

[0078] A first through groove 221 is formed on the top surface of the rectangular block 220, and a second through groove 222 is formed in the middle of the rectangular block 220. The first through groove 221 and the second through groove 222 communicate to form a "丄"-shaped groove. A horizontal convex block 231 is provided at the bottom end of the support block 230, and the horizontal convex block 231 is lapped on the rectangular block 220, and a through hole 232 is formed in the horizontal convex block 231.

[0079] The above-mentioned locking block 243 is slidably placed in the above-mentioned second through groove 222, the above-mentioned stud 241 is slidably placed in the above-mentioned first through groove 221, and the above-mentioned stud 241 passes through the above-mentioned through hole 232 and is screwed with the above-mentioned nut 242. When locking, the above-mentioned nut 242 and the above-mentioned locking block 243 clamp the above-mentioned horizontal convex block 231 and the above-mentioned rectangular block 220. At this time, the nut 242 is tightened on the above-mentioned stud 241.

[0080] The locking block 243 is an elliptical plate, with one end of the stud 241 fixedly connected to the center of the elliptical plate. The width of the elliptical plate is the same as the outer diameter of the stud 241, and the length of the elliptical plate is greater than the width of the first through-slot 221 and less than the width of the second through-slot 222. Thus, when the nut 242 is loosened, the stud 241 can slide in the first through-slot 221, and the locking block 243 can slide in the second through-slot 222, so that the support block 230 can slide on the rectangular block 220. When the support block 230 needs to be removed from the rectangular block 220, the locking block 243 can be slid out of the second through-slot 222 from the side, or the stud 241 can be rotated so that the length direction of the locking block 243 is the same as the length direction of the first through-slot 221, and the locking block 243 can be removed from the first through-slot 221. It is easy to understand that, in normal use, the length direction of the locking block 243 needs to be different from the length direction of the first through slot 221 , that is, the locking block 243 cannot pass through the first through slot 221 .

[0081] Optimally, in order to conveniently and accurately control the position of the support block 230 on the rectangular block 220, that is, to accurately adjust the span between the two support rollers 210, in this embodiment, a scale 223 is also provided on the outer wall of the above-mentioned rectangular block 220, so that the span adjustment can be accurately quantified.

[0082] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A fixture for measuring the bending properties of concrete specimens, characterized in that: include: Base (100); A support seat (200) is mounted on the base (100), a support roller (210) is rotatably mounted on the top of the support seat (200), and there are two support seats (200), one on the left and one on the right, and the concrete specimen (300) to be tested is overlapped on the two support rollers (210); a loading distribution beam (400) for connecting to a pressure-applying device, wherein a pressure roller (410) is installed at the bottom end of the loading distribution beam (400), the pressure roller (410) presses on the concrete specimen (300) to be tested, and the pressure roller (410) is located between the two support rollers (210); A linear motor (500) having a movable slide (510), wherein the linear motor (500) is mounted on the base (100) and located between the two support seats (200), and the sliding direction of the movable slide (510) is a front-to-back direction; A displacement meter (600) is installed on the movable slide (510), and the displacement meter (600) is used to measure the deformation of the concrete specimen (300) under pressure.

2. The fixture for measuring the bending properties of concrete specimens according to claim 1, characterized in that: Also includes: A mounting block (700) is mounted on the movable slide (510), and a mounting hole (710) is provided on the top surface of the mounting block (700); An electric telescopic rod (800) is installed in the installation hole (710), with the telescopic axis of the electric telescopic rod (800) facing upward; A mounting platform (900) is mounted on the telescopic shaft of the electric telescopic rod (800) so as to utilize the electric telescopic rod (800) to drive the mounting platform (900) to rise and fall; The displacement meter (600) is mounted on the mounting platform (900).

3. The fixture for measuring the bending properties of concrete specimens according to claim 2, characterized in that: A positioning guide hole (720) is also provided on the top surface of the mounting block (700); A positioning guide rod (910) is fixedly provided on the bottom surface of the mounting platform (900), and the positioning guide rod (910) is inserted into the positioning guide hole (720) in an upward and downward sliding manner.

4. The fixture for measuring the bending properties of concrete specimens according to any one of claims 1 to 3, characterized in that: The base (100) comprises: a first straight plate (110), the linear motor (500) being mounted on the first straight plate (110); A second straight plate (120) is fixedly provided at the middle of both sides of the first straight plate (110), the first straight plate (110) and the two second straight plates (120) form a "cross" structure, and a support seat (200) is installed on each second straight plate (120).

5. The fixture for measuring the bending properties of concrete specimens according to claim 4, characterized in that: The base (100) further comprises: A side plate (130) is fixedly connected to both left and right edges of the first straight plate (110), and the side plate (130) is arranged between the linear motor (500) and the support seat (200).

6. The fixture for measuring the bending properties of concrete specimens according to claim 5, characterized in that: Also includes: Silicone thin plate (1000), vertical plates (140) are fixedly provided at both the front and rear ends of the first straight plate (110), the silicone thin plate (1000) is fixedly connected between the tops of the two vertical plates (140), and the top surface of the silicone thin plate (1000) is adhered to the bottom surface of the concrete test piece (300) to be measured. The silicone thin plate (1000) is used to cover the cracks that appear when the concrete test piece (300) to be measured is compressed and deformed; The two vertical plates (140), the two side plates (130) and the first straight plate (110) enclose an installation groove, and the linear motor (500) is accommodated in the installation groove.

7. The fixture for measuring the bending properties of concrete specimens according to claim 5, characterized in that: The support base (200) includes: A rectangular block (220), which is installed on the second straight plate (120) and arranged in the left-right direction, and one end of the rectangular block (220) abuts against the side plate (130); A support block (230), the support roller (210) is rotatably installed at the top of the support block (230), and the support block (230) is slidably installed on the rectangular block (220) in the left-right direction; A locking component (240), which is installed between the support block (230) and the rectangular block (220), and the locking component (240) is used to lock the support block (230) to the rectangular block (220).

8. The fixture for measuring the bending performance of a concrete test piece according to claim 7, wherein: A first through groove (221) is opened on the top surface of the rectangular block (220), and a second through groove (222) is opened in the middle of the rectangular block (220). The first through groove (221) and the second through groove (222) are connected to form a "丄" shaped groove; A horizontal convex block (231) is provided at the bottom end of the support block (230), the horizontal convex block (231) is lapped on the rectangular block (220), and a through hole (232) is opened on the horizontal convex block (231); The locking component (240) includes a stud (241) and a nut (242). One end of the stud (241) is fixedly provided with a locking block (243). The locking block (243) is slidably placed in the second through groove (222), the stud (X) is slidably placed in the first through groove (221), and the stud (241) passes through the through hole (232) and is screwed with the nut (242); When locked, the nut (242) and the locking block (243) clamp the horizontal convex block (231) and the rectangular block (220).

9. The fixture for measuring the bending performance of a concrete test piece according to claim X, wherein: The locking block (243) is an oval plate, one end of the stud (241) is fixedly connected to the center position of the oval plate, the width of the oval plate is the same as the outer diameter of the stud (241), and the length of the oval plate is greater than the width of the first through groove (221) and less than the width of the second through groove (222).

10. The fixture for measuring the bending properties of concrete specimens according to claim 7, characterized in that: A scale (223) is also provided on the outer side wall of the rectangular block (220).

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