Concrete fracture resistance and compression resistance testing machine

Abstract

The utility model relates to a concrete anti-fracture and anti-compression testing machine, and belongs to the technical field of concrete anti-fracture and anti-compression testing machines. Comprising a test bench, a controller fixed on the top surface of the test bench, two vertical columns fixed on the top surface of the test bench, a detection member slidably connected between the two vertical columns, two anti-bending supports fixed on the top surface of the test bench, and a feeding mechanism arranged on the test bench. The feeding mechanism comprises two sliding bins fixed to the opposite sides of the two stand columns correspondingly, a clamping bin slidably connected between the two sliding bins, a clamping assembly arranged in the clamping bin, and a plurality of moving wheels rotationally connected to the bottom face of the clamping bin. And the two rotating rods are rotationally connected between the upper inner wall and the lower inner wall of the clamping bin. According to the concrete fracture resistance and compression resistance testing machine, during testing, a plurality of concrete blocks are placed on the testing table, the feeding mechanism automatically moves the concrete blocks to the position below the detection piece to be detected, and the detection efficiency of the testing machine is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of a concrete flexural and compressive strength testing machine. BACKGROUND

[0002] Concrete, also known as cement, is an indispensable raw material for construction projects. In the field of building material testing, the flexural and compressive strength testing of concrete is crucial. The concrete can be used only after meeting the standard detection requirements. When performing related tests, the concrete is made into square blocks and rectangular blocks. The square blocks are placed on the concrete flexural and compressive strength testing machine for compressive strength testing, and the rectangular blocks are used for flexural strength testing.

[0003] For example, a concrete flexural and compressive strength testing machine is disclosed in Chinese Patent (Publication No. CN212807874U), which includes an upper beam, a workbench, a testing machine body, a control assembly, and two support columns. The testing machine body and the two support columns are arranged on the workbench, and the testing machine body is located between the two support columns. The upper beam is fixedly connected to the two support columns. The control assembly for controlling the testing machine body is arranged on the workbench. The support column is provided with a lifting assembly, and the lifting assembly is sleeved outside the testing machine body. The lifting assembly is slidingly connected with a rotating assembly, and the rotating assembly is sleeved outside the testing machine body. The rotating assembly is connected with a cleaning assembly, and the cleaning assembly abuts against the testing machine body, thereby having the effect of facilitating cleaning.

[0004] However, the above-mentioned search patent still has some shortcomings. When in use, it is not convenient to automatically complete the feeding operation of the concrete blocks. During each detection, the concrete blocks need to be manually carried to the testing table for detection, which reduces the detection efficiency of the concrete flexural and compressive strength testing machine, and has certain inconvenience in use. Therefore, a concrete flexural and compressive strength testing machine is proposed to solve the above-mentioned problems. Content of the utility model

[0005] In view of the deficiencies of the prior art, the application provides a concrete flexural and compressive strength testing machine, which has the advantages of facilitating automatic feeding and improving detection efficiency, and solves the problems of the detection device disclosed in the above-mentioned search patent, which is not convenient for automatic feeding and has low detection efficiency.

[0006] To achieve the above-mentioned purpose, the application provides the following technical scheme: a concrete flexural and compressive strength testing machine, which comprises a testing table, a controller fixed on the top surface of the testing table, two vertical columns fixed on the top surface of the testing table, a detection piece slidingly connected between the two vertical columns, two flexural supports fixed on the top surface of the testing table, and a feeding mechanism arranged on the testing table.

[0007] The feeding mechanism comprises two sliding warehouses fixed on opposite sides of the two columns, a clamping warehouse slidingly connected between the two sliding warehouses, a clamping assembly arranged in the clamping warehouse, a plurality of moving wheels rotationally connected to the bottom surface of the clamping warehouse, two rotating rods rotationally connected between the upper and lower inner walls of the clamping warehouse, a worm wheel fixed on the outer circumferential wall of the rotating rod, a worm rotationally connected between the left and right inner walls of the clamping warehouse and engaged with the two worm wheels, a driving assembly arranged in the clamping warehouse, a driving gear fixed on the outer circumferential wall of the rotating rod, and two racks fixed on the inner walls of the two sliding warehouses.

[0008] The above technical scheme can place multiple concrete blocks on the test table, and the feeding mechanism can automatically move the concrete blocks under the detection piece for detection, thereby further improving the detection efficiency of the testing machine. The feeding mechanism is composed of a driving assembly and a clamping assembly. In use, the driving assembly can drive the clamping assembly to clamp a square or rectangular concrete block. After clamping, the driving assembly drives the clamping warehouse to move forward and backward, thereby automatically transporting the concrete block under the detection piece for detection. The operation is simple and convenient, and is suitable for feeding concrete blocks of different sizes, thereby being more practical.

[0009] Further, the clamping assembly comprises two support plates fixed on the inner bottom wall of the clamping warehouse, a bidirectional screw rotationally connected between the two support plates, two moving blocks threadedly connected to the outer circumferential wall of the bidirectional screw and slidingly connected with the inner bottom wall of the clamping warehouse, and a clamping plate fixed on the bottom surface of the moving block.

[0010] The above technical scheme can drive the bidirectional screw to rotate by the driving assembly when the concrete block needs to be clamped. The bidirectional screw drives the two moving blocks to slide relative to each other in the sliding hole. Further, the clamping plates on both sides can be clamped on the left and right sides of the concrete block. When the concrete block needs to be released, the bidirectional screw can be driven to reverse by the driving assembly.

[0011] Further, the driving assembly comprises an electric push rod fixed on the inner bottom wall of the clamping warehouse, a mounting plate fixed on the top end of the output shaft of the electric push rod, an electric motor fixed on the top surface of the mounting plate, a driving gear fixed on the right end of the output shaft of the electric motor, a first gear fixed on the outer circumferential wall of the worm and engaged with the driving gear, and a second gear fixed on the outer circumferential wall of the bidirectional screw.

[0012] Adopting the technical scheme, the control driving assembly controls the electric push rod to extend when completing the feeding operation, at this time, the driving gear is engaged with the first gear, the electric motor is controlled to rotate to drive the worm to rotate, so as to control the front and back movement of the clamping bin, when the concrete block needs to be clamped, the electric push rod is controlled to retract, the driving gear is moved downward to engage with the second gear, at this time, the electric motor is started again to drive the bidirectional screw to rotate to complete the clamping of the concrete block.

[0013] Further, the inner bottom wall of the test table is fixed with a gas cylinder, the top end of the gas cylinder is fixed with a compression-resistant support, and the top surface of the test table is provided with a receiving hole for the compression-resistant support to penetrate and slideably connect with the compression-resistant support.

[0014] Adopting the technical scheme, when the rectangular concrete block is subjected to the bending test, the concrete block is erected between the two bending supports, at this time, the compression-resistant support is received in the receiving hole and does not contact the rectangular concrete block, so as to facilitate the bending test of the detection piece, when the square concrete block is subjected to the compression test, the square concrete block is carried to the top of the compression-resistant support by the feeding mechanism, at this time, the gas cylinder lifts the compression-resistant support, so as to cooperate with the detection piece to apply pressure for the compression test.

[0015] Further, the two bending supports are opposite to each other and located between the two columns, the compression-resistant support is arranged between the two bending supports and close to the front side of the test table, and the compression-resistant support is opposite to the detection piece in the up-down direction.

[0016] Adopting the technical scheme, the detection piece can be guided by the column, so as to accurately press the concrete block for detection.

[0017] Further, the opposite sides of the two sliding bins are provided with moving holes for the clamping bin to penetrate and slide in the front and back directions, the left and right sides of the clamping bin are provided with penetrating holes for the driving gear to penetrate, the outer peripheral wall of the worm is provided with two spiral grooves with opposite spiral directions and engaged with the two worm gears, and a plurality of moving wheels are arranged in the two sliding bins.

[0018] Adopting the technical scheme, the moving holes are convenient for the stable front and back movement of the clamping bin, and the penetrating holes are convenient for the driving gear to penetrate the clamping bin and engage with the rack.

[0019] Further, the two support plates are opposite to each other, the bidirectional screw is opposite to the worm in the up-down direction, the sliding hole is used for the left and right sliding of the moving block in the sliding hole and the clearance fit therebetween, the left side of the moving block is provided with a threaded hole for the bidirectional screw to penetrate and match with the threaded hole, and the two moving blocks are respectively threadedly connected with the two opposite threaded grooves on the outer peripheral wall of the bidirectional screw.

[0020] Adopting the technical scheme, the two moving blocks and the two clamping plates are moved towards or away from each other by the two-way screw.

[0021] Further, the first gear and the second gear are opposite to each other, and the driving gear is arranged between the first gear and the second gear.

[0022] Adopting the technical scheme, the front and back movement of the clamping chamber and the clamping are adjusted by the up and down movement of the driving gear.

[0023] Compared with the prior art, the technical scheme has the following beneficial effects:

[0024] 1. The concrete folding and compression testing machine supports the rectangular concrete block through the two folding supports to cooperate with the detection piece for folding detection, and supports the square concrete block through the compression support to cooperate with the detection piece for compression detection, simplifies the operation process, and significantly improves the test efficiency. During testing, multiple concrete blocks can be placed on the test table, and the feeding mechanism can automatically move the concrete blocks under the detection piece for detection, further improving the detection efficiency of the testing machine.

[0025] 2. The concrete folding and compression testing machine, the feeding mechanism is composed of a driving assembly and a clamping assembly. During use, the driving assembly can drive the clamping assembly to clamp the square concrete block or the rectangular concrete block. After clamping, the driving assembly drives the clamping chamber to move forward and backward, thereby automatically transporting the concrete block under the detection piece for detection. The operation is simple and convenient, and is suitable for feeding concrete blocks of different sizes, and has better practicality. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a front view schematic diagram of the present application;

[0027] Figure 2 It is a front view schematic diagram of the clamping chamber of the present application;

[0028] Figure 3 It is an enlarged schematic diagram of A in the present application; Figure 2

[0029] Figure 4 It is a schematic diagram of the compression support of the present application.

[0030] ​In the figure: 1, test bench; 2, controller; 3, stand; 4, detection piece; 5, anti-bending support; 601, sliding bin; 602, clamping bin; 603, moving wheel; 604, rotating rod; 605, worm wheel; 606, worm; 607, drive gear; 608, rack; 701, support plate; 702, bidirectional screw; 703, moving block; 704, clamping plate; 705, sliding hole; 801, electric push rod; 802, mounting plate; 803, motor; 804, driving gear; 805, first gear; 806, second gear; 9, air cylinder; 10, compression support; 11, storage hole. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0032] Please refer to Figure 1 The concrete anti-bending and compression testing machine in the embodiment includes a test bench 1, a controller 2 fixed on the top surface of the test bench 1, two stands 3 fixed on the top surface of the test bench 1, a detection piece 4 slidingly connected between the two stands 3, two anti-bending supports 5 fixed on the top surface of the test bench 1, and a feeding mechanism arranged on the test bench 1. During testing, a plurality of concrete blocks can be placed on the test bench 1, and the feeding mechanism can automatically move the concrete blocks to below the detection piece 4 to perform detection by the detection piece 4 applying pressure, thereby effectively improving the detection efficiency of the testing machine.

[0033] It should be noted that the detection piece 4 mentioned in the present application can move up and down along the stand 3 to apply pressure to the concrete block and detect the pressure value. The detection piece 4 belongs to the existing public technology, and therefore its specific structure and working principle will not be described in detail. In addition, the control mode of the present application is controlled by the controller 2. The control circuit of the controller 2 can be realized by simple programming by a person of ordinary skill in the art, and the power supply also belongs to the common knowledge in the art. Moreover, the present application is mainly used to protect mechanical devices, and therefore the control mode and circuit connection will not be explained in detail.

[0034] Please refer to Figure 4In the embodiment, the inner bottom wall of the test table 1 is fixed with the air cylinder 9, the top end of the air cylinder 9 is fixed with the compression support 10, the top surface of the test table 1 is provided with the receiving hole 11 for the compression support 10 to penetrate and slide connect with the compression support 10, the two anti-bending supports 5 are opposite to each other and located between the two vertical columns 3, the compression support 10 is located between the two anti-bending supports 5 and close to the front side of the test table 1, the compression support 10 is opposite to the detection piece 4 in up-down direction, when detecting, the two anti-bending supports 5 are arranged to support the rectangular concrete block to cooperate with the detection piece 4 to detect the bending resistance, the concrete block is arranged between the two anti-bending supports 5, at this time, the compression support 10 is received in the receiving hole 11 and does not contact with the rectangular concrete block, so that the detection piece 4 can press to complete the bending resistance test, the compression support 10 is arranged to support the square concrete block to cooperate with the detection piece 4 to detect the compression resistance, the square concrete block is carried to the top of the compression support 10 by the feeding mechanism, at this time, the air cylinder 9 lifts the compression support 10 to cooperate with the detection piece 4 to exert the pressure to detect the compression resistance, which simplifies the operation process and significantly improves the test efficiency.

[0035] Please refer to Figures 1 to 2 The feeding mechanism comprises two sliding warehouses 601 fixed on the opposite sides of the two vertical columns 3, a clamping warehouse 602 slide connected between the two sliding warehouses 601, a clamping assembly arranged in the clamping warehouse 602, a plurality of moving wheels 603 rotationally connected to the bottom surface of the clamping warehouse 602, two rotating rods 604 rotationally connected between the upper and lower inner walls of the clamping warehouse 602, a worm wheel 605 fixed on the outer circumferential wall of the rotating rod 604, a worm gear 606 rotationally connected between the left and right inner walls of the clamping warehouse 602 and engaged with the two worm wheels 605, a driving assembly arranged in the clamping warehouse 602, a driving gear 607 fixed on the outer circumferential wall of the rotating rod 604, and two racks 608 fixed on the inner walls of the opposite sides of the two sliding warehouses 601, the two racks 608 are engaged with the two driving gears 607 respectively, the outer circumferential wall of the worm gear 606 is provided with two spiral grooves with opposite spiral directions and engaged with the two worm wheels 605 respectively, and the plurality of moving wheels 603 are arranged in the two sliding warehouses 601. In use, the concrete block is placed on the top surface of the test table 1, and then the driving assembly is controlled to drive the worm gear 606 to rotate, the worm gear 606 drives the two worm wheels 605 to rotate synchronously and in opposite directions, the two worm wheels 605 drive the two rotating rods 604 to rotate synchronously and in opposite directions, further, the two rotating rods 604 drive the driving gears 607 on the two sides to rotate synchronously and in opposite directions, so that the driving gears 607 move backward along the racks 608, and then the moving wheels 603 drive the clamping warehouse 602 to slide backward between the two sliding warehouses 601, when the clamping warehouse 602 slides to the top of the concrete block, the clamping assembly can be driven by the driving assembly to clamp the left and right sides of the concrete block, further, the driving assembly drives the clamping warehouse 602 to slide forward, so as to carry the concrete block to the lower side of the detection piece 4 for detection.

[0036] In the embodiment, the opposite sides of the two sliding warehouses 601 are provided with moving holes for the clamping warehouse 602 to penetrate and slide inside, which facilitates the stable movement of the clamping warehouse 602, and the left and right sides of the clamping warehouse 602 are provided with penetration holes for the driving gear 607 to penetrate, which facilitates the penetration of the driving gear 607 through the clamping warehouse 602 and the engagement with the rack 608.

[0037] Please refer to Figure 2 In the embodiment, the clamping assembly includes two support plates 701 fixed on the inner bottom wall of the clamping warehouse 602, a bidirectional screw 702 rotationally connected between the two support plates 701, two moving blocks 703 threadedly connected to the outer peripheral wall of the bidirectional screw 702 and in sliding connection with the inner bottom wall of the clamping warehouse 602, and a clamping plate 704 fixed on the bottom surface of the moving block 703. The bottom surface of the clamping warehouse 602 is provided with a sliding hole 705 for the sliding connection of the moving block 703. When it is necessary to clamp the concrete block, the driving assembly drives the bidirectional screw 702 to rotate, which drives the two moving blocks 703 to slide relative to each other inside the sliding hole 705, and further drives the clamping plates 704 on both sides to clamp the left and right sides of the concrete block. When it is necessary to put down the concrete block, the driving assembly drives the bidirectional screw 702 to reverse.

[0038] In the embodiment, the two support plates 701 are opposite to each other, the bidirectional screw 702 is opposite to the worm 606, the sliding hole 705 is used for the left and right sliding of the moving block 703 and gap fit therebetween, the left side of the moving block 703 is provided with a threaded hole for the penetration of the bidirectional screw 702 and the adaptation thereof, and the two moving blocks 703 are respectively threadedly connected with two opposite threaded grooves on the outer peripheral wall of the bidirectional screw 702. Such a structure facilitates the relative movement or opposite movement of the two moving blocks 703 and the two clamping plates 704 through the driving of the bidirectional screw 702.

[0039] Please refer to Figure 3In the embodiment, the driving assembly includes an electric push rod 801 fixed on the bottom wall in the clamping bin 602, an installation plate 802 fixed on the top end of the output shaft of the electric push rod 801, a motor 803 fixed on the top surface of the installation plate 802, a driving gear 804 fixed on the right end of the output shaft of the motor 803, a first gear 805 fixed on the outer peripheral wall of the worm 606 and engaged with the driving gear 804, and a second gear 806 fixed on the outer peripheral wall of the bidirectional screw rod 702. When the driving assembly is controlled to complete the feeding operation, the electric push rod 801 is controlled to extend. At this time, the electric push rod 801 drives the installation plate 802 to move upwards, the installation plate 802 drives the motor 803 to move upwards, the motor 803 drives the driving gear 804 to move upwards and engage with the first gear 805. At this time, the motor 803 is controlled to rotate, so that the worm 606 is driven to rotate through the driving gear 804 and the first gear 805, so as to control the clamping bin 602 to move forward and backward. When it is needed to clamp the concrete block, the electric push rod 801 is controlled to retract. The electric push rod 801 drives the installation plate 802 and the motor 803 to move downwards, so that the motor 803 drives the driving gear 804 to move downwards and disengage from the first gear 805 and engage with the second gear 806. At this time, the motor 803 is started again, so that the bidirectional screw rod 702 is driven to rotate through the driving gear 804 and the second gear 806, to complete the clamping of the concrete block.

[0040] In the embodiment, the first gear 805 and the second gear 806 are opposite to each other in the up-down direction, and the driving gear 804 is arranged between the first gear 805 and the second gear 806. Such a structure facilitates the adjustment and control of the forward and backward movement of the clamping bin 602 through the up-down movement of the driving gear 804.

[0041] The working principle of the above embodiment is as follows:

[0042] (1) In use, the concrete block is placed on the top surface of the test table 1, and then the driving assembly is controlled to drive the worm 606 to rotate. The worm 606 drives the two worm gears 605 to synchronously rotate in opposite directions. The two worm gears 605 drive the two rotating rods 604 to synchronously rotate in opposite directions. Further, the two rotating rods 604 drive the driving gears 607 on the two sides to synchronously rotate in opposite directions, so that the driving gears 607 move backward along the rack 608. Then, the driving assembly drives the clamping bin 602 to slide backward between the two sliding bins 601 in cooperation with the moving wheels 603. When the clamping bin 602 slides to the top of the concrete block, the clamping assembly is driven by the driving assembly to clamp the left and right sides of the concrete block. Further, the driving assembly drives the clamping bin 602 to slide forward, so as to carry the concrete block to the lower side of the detection piece 4 for detection.

[0043] (2) When it is necessary to clamp the concrete block, the driving assembly drives the bidirectional screw rod 702 to rotate, the bidirectional screw rod 702 drives the two moving blocks 703 to slide relatively in the sliding hole 705, further, the two clamping plates 704 on the two sides can be clamped on the left and right sides of the concrete block, when it is necessary to put down the concrete block, the driving assembly drives the bidirectional screw rod 702 to reverse, and the clamping of the concrete block is completed;

[0044] (3) When the control driving assembly completes the feeding operation, the electric push rod 801 is controlled to extend, at this time, the electric push rod 801 drives the mounting plate 802 to move upwards, the mounting plate 802 drives the motor 803 to move upwards, the motor 803 drives the driving gear 804 to move upwards and mesh with the first gear 805, at this time, the motor 803 is controlled to rotate, the driving gear 804 and the first gear 805 drive the worm 606 to rotate, so as to control the clamping chamber 602 to move forward and backward, when it is necessary to clamp the concrete block, the electric push rod 801 is controlled to retract, the electric push rod 801 drives the mounting plate 802 and the motor 803 to move downwards, the motor 803 drives the driving gear 804 to move downwards and disengage from the first gear 805 and mesh with the second gear 806, at this time, the motor 803 is started again, the driving gear 804 and the second gear 806 drive the bidirectional screw rod 702 to rotate, and the clamping of the concrete block is completed.

Claims

1. A concrete flexural and compressive strength testing machine, characterized in that: It includes a test bench (1), a controller (2) fixed on the top surface of the test bench (1), two columns (3) fixed on the top surface of the test bench (1), a detection piece (4) slidably connected between the two columns (3), two anti-bending supports (5) fixed on the top surface of the test bench (1), and a feeding mechanism set on the test bench (1). The feeding mechanism includes two sliding chambers (601) fixed on opposite sides of the two columns (3), a clamping chamber (602) slidably connected between the two sliding chambers (601), a clamping assembly disposed inside the clamping chamber (602), multiple moving wheels (603) rotatably connected to the bottom surface of the clamping chamber (602), two rotating rods (604) rotatably connected between the upper and lower inner walls of the clamping chamber (602), and a component fixed to the outer peripheral wall of the rotating rods (604). The components include a worm gear (605), a worm (606) rotatably connected between the inner walls of the left and right sides of the clamping chamber (602) and meshing with the two worm gears (605), a drive assembly disposed inside the clamping chamber (602), a drive gear (607) fixed on the outer peripheral wall of the rotating rod (604), and two racks (608) respectively fixed on the inner walls of the opposite sides of the two sliding chambers (601), with the two racks (608) meshing with the two drive gears (607) respectively.

2. The concrete flexural and compressive strength testing machine according to claim 1, characterized in that: The clamping assembly includes two support plates (701) fixed on the inner bottom wall of the clamping chamber (602), a bidirectional screw (702) rotatably connected between the two support plates (701), two movable blocks (703) threaded to the outer peripheral wall of the bidirectional screw (702) and slidably connected to the inner bottom wall of the clamping chamber (602), and a clamping plate (704) fixed on the bottom surface of the movable block (703). The bottom surface of the clamping chamber (602) is provided with a sliding hole (705) for the movable block (703) to slide.

3. The concrete flexural and compressive strength testing machine according to claim 2, characterized in that: The drive assembly includes an electric push rod (801) fixed to the bottom wall of the clamping chamber (602), a mounting plate (802) fixed to the top of the output shaft of the electric push rod (801), a motor (803) fixed to the top surface of the mounting plate (802), a drive gear (804) fixed to the right end of the output shaft of the motor (803), a first gear (805) fixed to the outer peripheral wall of the worm (606) and meshing with the drive gear (804), and a second gear (806) fixed to the outer peripheral wall of the bidirectional screw (702).

4. The concrete flexural and compressive strength testing machine according to claim 1, characterized in that: A cylinder (9) is fixed on the inner bottom wall of the test bench (1), and a pressure-resistant support (10) is fixed on the top of the cylinder (9). A storage hole (11) is opened on the top surface of the test bench (1) for the pressure-resistant support (10) to pass through and slide with it.

5. A concrete flexural and compressive strength testing machine according to claim 4, characterized in that: The two bending supports (5) are positioned opposite each other and located between the two columns (3). The compression support (10) is positioned between the two bending supports (5) and close to the front of the test bench (1). The compression support (10) is positioned opposite the test piece (4) vertically.

6. A concrete flexural and compressive strength testing machine according to claim 1, characterized in that: Each of the two sliding chambers (601) has a moving hole on its opposite side for the clamping chamber (602) to pass through and slide back and forth inside it. The clamping chamber (602) has a through hole on its left and right sides for the drive gear (607) to pass through. The outer peripheral wall of the worm (606) has a spiral groove with opposite spiral directions at both ends that mesh with two worm wheels (605) respectively. Multiple moving wheels (603) are respectively disposed inside the two sliding chambers (601).

7. A concrete flexural and compressive strength testing machine according to claim 2, characterized in that: The two support plates (701) are positioned opposite each other from left to right, and the bidirectional screw (702) and worm gear (606) are positioned opposite each other from top to bottom. The sliding hole (705) is used for the moving block (703) to slide left and right inside it with a clearance fit. The left side of the moving block (703) is provided with a threaded hole for the bidirectional screw (702) to pass through and be adapted to it. The two moving blocks (703) are respectively threaded to two opposite threaded grooves on the outer peripheral wall of the bidirectional screw (702).

8. A concrete flexural and compressive strength testing machine according to claim 3, characterized in that: The first gear (805) and the second gear (806) are positioned vertically opposite each other, and the driving gear (804) is located between the first gear (805) and the second gear (806).

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