Concrete stress testing device

Abstract

The invention discloses a concrete stress testing device which comprises a bottom plate, two openings are formed in the top of the bottom plate, the two openings are symmetrically arranged front and back, a guide block is fixedly connected to the center of the top of the bottom plate, two sliding blocks are slidably connected to the top of the guide block, and the two sliding blocks are symmetrically arranged front and back. And the tops of the two sliding blocks are fixedly connected with lower clamping plates, the tops of the two lower clamping plates are fixedly connected with arc-shaped plates, and the upper motor, a belt, a driving groove wheel, a driven groove wheel, a fifth spring, a fixing rod, a cleaning brush, a welding plate, a baffle, a connecting rod and other components are matched with one another; vaseline can be smeared on the inner side wall of the cutting ring before the cutting ring is used for cutting, the cutting ring can be conveniently separated from a soil sample, and wet concrete in the cutting ring can be cleaned when concrete stress detection is completed.

Description

Technical Field

[0001] The invention relates to the technical field of concrete testing, in particular to a concrete stress testing device. Background Art

[0002] Concrete stress refers to the internal intermolecular force that occurs when concrete is subjected to stress. There are compressive stress and tensile stress inside the concrete. When subjected to pressure, the concrete stress is relatively evenly distributed in the part bearing the pressure, which manifests as an overall reduction and elastic deformation. When subjected to tension, the concrete stress will be concentrated around the stressed part, forming a stress concentration area, which is manifested as the generation of cracks and a significant reduction in bearing capacity.

[0003] There are many ways to detect concrete stress, and direct measurement is one of the more popular methods. The concrete sample is placed in a shear fixture, and vertical pressure and horizontal shear force are applied to cause shear failure of the sample. By measuring the shear force and shear displacement, the shear strength of the concrete can be calculated, thereby indirectly reflecting the magnitude of the shear stress.

[0004] The direct measurement method requires preparation work before testing, such as cutting the concrete sample with a ring knife to obtain the prepared soil sample. However, the existing preparation methods are all achieved through manual operation. The staff needs to manually press the ring knife on the concrete sample and cut the concrete with a knife. At the same time, the two ends of the concrete need to be kept level, which is very inconvenient to operate. Summary of the invention

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A concrete stress testing device comprises a bottom plate, wherein the top of the bottom plate is provided with two openings, and the two openings are symmetrically arranged front to back, a guide block is fixedly connected to the center of the top of the bottom plate, the top of the guide block is slidably connected to two sliders, the two sliders are symmetrically arranged front to back, the tops of the two sliders are fixedly connected to lower clamping plates, the tops of the two lower clamping plates are fixedly connected to arc plates, a concrete column is commonly attached between the two arc plates, a placement plate is attached to the bottom of the concrete column, the placement plate is located between the two lower clamping plates, the bottom of the placement plate is fixedly connected to vertical rods near the left and right sides, the bottom ends of the two vertical rods pass through the inner cavity of the bottom plate, and the outer sides of the vertical rods A first spring is sleeved on the outer side of the vertical rod near the bottom end, and a connecting plate is sleeved on the outer side of the vertical rod near the bottom end, the top of the first spring is fixedly connected to the bottom of the placement plate, the bottom of the first spring is fixedly connected to the top of the connecting plate, a trigger is installed on the top of the slider near the rear side, a lifting block is provided between the two support plates, cranks are hinged on the front and rear sides of the two sliders, two annular openings are provided on the cranks, the left and right sides of the two lower clamping plates are fixedly connected with first plug rods, the first plug rods are fitted with adjacent annular openings, two second plug rods are fixedly connected to the left and right sides of the lifting block, and several of the second plug rods are fitted with adjacent annular openings, and the corresponding sides of the two connecting plates are fixedly connected to the lifting block.

[0007] Preferably, the tops of the two lower clamps are fixedly connected to side panels, the corresponding sides of the two side panels are provided with slide grooves, the inner cavities of the two slide grooves are slidably connected to moving blocks near the tops, the corresponding sides of the two moving blocks are fixedly connected to clamping blocks, the corresponding sides of the two clamping blocks are fitted with the outer sides of the concrete columns, the top of the side panel on the front side is fixedly connected to a push rod, the top of the push rod is fixedly connected to a guide plate, the top of the side panel on the rear side is fixedly connected to a protective cover, the bottoms of the two moving blocks are fixedly connected to a cylinder, the bottom ends of the cylinders are fixedly connected to the lower clamp, and a ring knife is fitted between the two clamping blocks.

[0008] Preferably, there is a motor on the front side of the protective cover, and the power output shaft of the motor passes through the inner cavity of the protective cover. Two sleeve plates are fixedly connected to the bottom of the inner cavity of the protective cover, and the two sleeve plates are symmetrically arranged front to back. The power output shaft passes through the inner cavity of the two sleeve plates, and a convex plate is fixedly sleeved on the outer side of the power output shaft, and the convex plate is located between the two sleeve plates. A movable plate is fitted on the top of the convex plate, and two protrusions are arranged on the outer side of the movable plate, and the two protrusions are symmetrically arranged left to right. A fitting block is fixedly connected to the inner wall of the protective cover, and the fitting block is fitted with the movable plate.

[0009] Preferably, a column is fixedly connected at the center of the top of the movable plate, an intermittent rotating plate is provided at the top of the protective cover, a sleeve is fixedly connected to the bottom of the intermittent rotating plate, the bottom end of the sleeve passes through the inner cavity of the protective cover, the top of the column is slidably connected to the inner cavity of the sleeve, a third spring is sleeved on the outer side of the column, the top of the third spring is fixedly connected to the bottom end of the sleeve, and the bottom end of the third spring is fixedly connected to the bottom end of the movable plate.

[0010] Preferably, there is an upper motor on the top of the intermittent rotating plate, and two active groove wheels are fixedly sleeved on the outer side of the power output shaft of the upper motor. The two active groove wheels are symmetrically arranged up and down, and there are driven groove wheels on the opposite sides of the two active groove wheels. A belt is commonly sleeved on the outer sides of the active groove wheel and the driven groove wheel. The power output shaft of the upper motor is connected to the top bearing of the intermittent rotating plate, and a central shaft is penetrated at the center of the two driven groove wheels and fixedly connected to them. Fixed plates are fixedly connected to the top of the intermittent rotating plate near the front and rear sides, and the bottom end of the central shaft penetrates the inner cavity of the fixed plate.

[0011] Preferably, there is a rotating plate at the bottom of the fixed plate located on the front side, and the bottom end of the central axis located on the front side is fixedly connected to the top of the rotating plate, and a second spring is sleeved on the outside of the central axis, and the second spring is located under the fixed plate, and a first arc-shaped protrusion is provided at the top of the rotating plate near the edge, and a second arc-shaped protrusion is provided at the bottom of the guide plate near the edge, and a plurality of connecting rods are fixedly connected to the bottom of the rotating plate, and the plurality of connecting rods are arranged in a circular array with the center of the rotating plate as the center, and the bottom end of the connecting rod is hinged with a welding plate, and the bottom of the welding plate is fixedly connected with a fixing rod, and the bottom end of the fixing rod is fixedly connected with a smear sponge, and the bottom end of the connecting rod is fixedly connected with a baffle, and the baffle is fit with the welding plate.

[0012] Preferably, there is a rotating plate at the bottom of the fixed plate located on the rear side, the bottom end of the central axis located on the rear side is fixedly connected to the top of the rotating plate, and a plurality of cleaning brushes are fixedly connected to the bottom end of the rotating plate, and the plurality of cleaning brushes are arranged in a circular array with the center of the rotating plate as the center.

[0013] Preferably, two L-shaped connecting plates are fixedly connected to the right sides of the two side panels, and every two adjacent L-shaped connecting plates are symmetrically arranged up and down. There are two cutters on the right side of the concrete column, and the two cutters are symmetrically arranged up and down. The front and rear sides of the cutters are slidingly connected to the adjacent L-shaped connecting plates, and the top of the cutter is fixedly connected to two racks, and the top of the rack is meshed with a gear near the left side. A side motor is fixedly connected to the center of the gear located on the front side, and the bottom of the side motor is fixedly connected to the adjacent L-shaped connecting plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention can achieve the purpose of fixing the concrete column and the ring knife through the mutual cooperation between the lower clamping plate, the arc plate, the slider, the guide block, the bottom plate, the support plate, the first spring, the connecting plate, the crank and other components, so as to prevent the concrete column from tilting during the cutting process;

[0016] 2. The present invention can realize that vaseline can be applied on the inner wall of the ring knife before cutting through the mutual cooperation between the upper motor, belt, active groove wheel, driven groove wheel, fifth spring, fixed rod, cleaning brush, welding plate, baffle, connecting rod and other components, so as to facilitate the separation of the ring knife from the soil sample, and the wet concrete inside the ring knife can be cleaned when the concrete stress detection is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 It is a structural plan view of the present invention;

[0019] Figure 3 It is a bottom view of the structure of the present invention;

[0020] Figure 4 This is a schematic diagram of the bottom plate structure of the component of the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of the L-shaped connecting plate of the component of the present invention;

[0022] Figure 6 This is a schematic diagram of the side plate structure of the component of the present invention;

[0023] Figure 7 This is a schematic diagram of the motor structure of the component of the present invention;

[0024] Figure 8 It is a plan view of the motor structure of the component of the present invention;

[0025] Fig. 9 This is a schematic diagram of the structure of the rotating plate component of the present invention;

[0026] Fig.10 This is a schematic diagram of the structure of the rotating plate component of the present invention;

[0027] Fig.11 for Fig. 9 Enlarged view of point A in the middle.

[0028] Numbers in the figure: 1, bottom plate; 2, support plate; 3, guide block; 4, slider; 5, crank; 6, connecting plate; 7, placement plate; 8, lower clamping plate; 9, side plate; 10, curved plate; 11, concrete column; 12, L-shaped connecting plate; 13, top rod; 14, guide plate; 15, cutter; 16, rotating plate; 17, ring knife; 18, protective cover; 19, cleaning brush; 20, rotating plate; 21, upper motor; 22, belt; 23, fixed plate; 24, lifting block; 25, first spring Spring; 26, vertical rod; 27, trigger; 28, motor; 29, second spring; 30, intermittent rotating plate; 31, side motor; 32, gear; 33, rack; 34, clamping block; 35, moving block; 36, cylinder; 37, third spring; 38, movable plate; 39, sleeve plate; 40, convex plate; 41, fitting block; 42, column; 43, driven groove wheel; 44, fixing rod; 45, smear sponge; 46, active groove wheel; 47, connecting rod; 48, welding plate; 49, baffle. DETAILED DESCRIPTION

[0029] See also Figure 1-11 , the present invention provides a technical solution:

[0030] A concrete stress testing device comprises a bottom plate 1, two openings are provided on the top of the bottom plate 1, and the two openings are symmetrically arranged front and back, a guide block 3 is fixedly connected at the center of the top of the bottom plate 1, two sliders 4 are slidably connected to the top of the guide block 3, the two sliders 4 are symmetrically arranged front and back, the tops of the two sliders 4 are fixedly connected to lower clamping plates 8, the tops of the two lower clamping plates 8 are fixedly connected to arc plates 10, a concrete column 11 is commonly attached between the two arc plates 10, a placement plate 7 is attached to the bottom of the concrete column 11, and the placement plate 7 is located between the two lower clamping plates 8, the bottom of the placement plate 7 near the left and right sides are fixedly connected with vertical rods 26, the bottom ends of the two vertical rods 26 pass through the inner cavity of the bottom plate 1, the outer side of the vertical rod 26 is sleeved with a first spring 25, the outer side of the vertical rod 26 near the bottom end is sleeved with a connecting plate 6, the top of the first spring 25 is fixedly connected to the bottom of the placement plate 7, the bottom end of the first spring 25 is fixedly connected to the top of the connecting plate 6, a trigger 27 is installed near the rear side of the top of the slider 4, a lifting block 24 is arranged between the two support plates 2, and the front and rear ends of the two sliders 4 are connected. The two sides are hinged with cranks 5, and two annular openings are provided on the cranks 5. The left and right sides of the two lower clamps 8 are fixedly connected with first plug rods, and the first plug rods are fitted with adjacent annular openings. The left and right sides of the lifting block 24 are fixedly connected with two second plug rods, and a plurality of second plug rods are fitted with adjacent annular openings. The corresponding sides of the two connecting plates 6 are fixedly connected to the lifting block 24. The tops of the two lower clamps 8 are fixedly connected with side plates 9, and the corresponding sides of the two side plates 9 are provided with slide grooves. The inner cavities of the two slide grooves are near the tops. A moving block 35 is slidably connected, and a clamping block 34 is fixedly connected to one side corresponding to the two moving blocks 35. A clamping block 34 is fitted to the outer side of the concrete column 11 on one side. A push rod 13 is fixedly connected to the top of the side plate 9 on the front side, and a guide plate 14 is fixedly connected to the top of the push rod 13. A protective cover 18 is fixedly connected to the top of the side plate 9 on the rear side. A cylinder 36 is fixedly connected to the bottom of the two moving blocks 35, and the bottom end of the cylinder 36 is fixedly connected to the lower clamping plate 8. A ring knife 17 is fitted between the two clamping blocks 34.

[0031] The protective cover 18 has a motor 28 on the front side, and the power output shaft of the motor 28 passes through the inner cavity of the protective cover 18. Two sleeves 39 are fixedly connected to the bottom of the inner cavity of the protective cover 18. The two sleeves 39 are symmetrically arranged front and back. The power output shaft passes through the inner cavity of the two sleeves 39. A convex plate 40 is fixedly sleeved on the outer side of the power output shaft. The convex plate 40 is located between the two sleeves 39. A movable plate 38 is attached to the top of the convex plate 40. Two convex blocks are arranged on the outer side of the movable plate 38. The two convex blocks are symmetrically arranged left and right. A fitting block 41 is fixedly connected to the side wall, and the fitting block 41 is fitted with the movable plate 38. A column 42 is fixedly connected to the center of the top of the movable plate 38. An intermittent rotating plate 30 is provided on the top of the protective cover 18. A sleeve is fixedly connected to the bottom of the intermittent rotating plate 30. The bottom end of the sleeve passes through the inner cavity of the protective cover 18. The top of the column 42 is slidably connected to the inner cavity of the sleeve. A third spring 37 is sleeved on the outer side of the column 42. The top of the third spring 37 is fixedly connected to the bottom end of the sleeve, and the bottom end of the third spring 37 is fixedly connected to the bottom end of the movable plate 38.

[0032] An upper motor 21 is arranged on the top of the intermittent rotating plate 30, and two active groove wheels 46 are fixedly sleeved on the outer side of the power output shaft of the upper motor 21. The two active groove wheels 46 are symmetrically arranged up and down, and there are driven groove wheels 43 on the opposite sides of the two active groove wheels 46. The outer sides of the active groove wheels 46 and the driven groove wheels 43 are jointly sleeved with a belt 22, and the power output shaft of the upper motor 21 is connected to the top bearing of the intermittent rotating plate 30. A central shaft is penetrated at the center of the two driven groove wheels 43 and fixedly connected thereto. A fixed plate 23 is fixedly connected to the top of the intermittent rotating plate 30 near the front and rear sides, and the bottom end of the central shaft penetrates the inner cavity of the fixed plate 23. A rotating plate 16 is arranged at the bottom of the fixed plate 23 on the front side, and the bottom end of the central shaft on the front side is fixedly connected to the top of the rotating plate 16. A second spring 29 is sleeved on the outer side of the central shaft, and the second spring 29 is positioned at the Below the fixed plate 23, a first arc-shaped protrusion is provided at the top near the edge of the rotating plate 16, and a second arc-shaped protrusion is provided at the bottom near the edge of the guide plate 14. A plurality of connecting rods 47 are fixedly connected to the bottom of the rotating plate 16, and the plurality of connecting rods 47 are arranged in a circular array with the center of the rotating plate 16 as the center. A welding plate 48 is hinged at the bottom end of the connecting rod 47, and a fixed rod 44 is fixedly connected to the bottom of the welding plate 48. A smear sponge 45 is fixedly connected to the bottom end of the fixed rod 44, and a baffle 49 is fixedly connected to the bottom end of the connecting rod 47, and the baffle 49 is fitted with the welding plate 48. A rotating plate 20 is provided at the bottom of the fixed plate 23 at the rear side, and the bottom end of the central axis at the rear side is fixedly connected to the top of the rotating plate 20. A plurality of cleaning brushes 19 are fixedly connected to the bottom end of the rotating plate 20, and the plurality of cleaning brushes 19 are arranged in a circular array with the center of the rotating plate 20 as the center.

[0033] Two L-shaped connecting plates 12 are fixedly connected to the right sides of the two side panels 9, and every two adjacent L-shaped connecting plates 12 are symmetrically arranged up and down. There are two cutters 15 on the right side of the concrete column 11, and the two cutters 15 are symmetrically arranged up and down. The front and rear sides of the cutters 15 are slidingly connected to the adjacent L-shaped connecting plates 12, and the top of the cutter 15 is fixedly connected to two racks 33. A gear 32 is meshed with the top of the rack 33 near the left side, and a side motor 31 is fixedly connected to the center of the gear 32 on the front side, and the bottom of the side motor 31 is fixedly connected to the adjacent L-shaped connecting plate 12.

[0034] Working principle: First, the staff places the concrete column 11 on the top of the placement plate 7, and the weight of the concrete column 11 causes the placement plate 7 to move downward. When the placement plate 7 moves downward, the vertical rod 26 and the first spring 25 can drive the connecting plate 6 to move downward. When the connecting plate 6 moves downward, the lifting block 24 can be driven to move downward. When the lifting block 24 moves downward, the two lower clamping plates 8 can be driven to move in opposite directions through a plurality of cranks 5. When the two lower clamping plates 8 move in opposite directions, the two arc plates 10 can be driven to move in opposite directions, thereby fixing the outer side of the concrete column 11. When the lower clamping plates 8 move The side plate 9 can drive the two clamping blocks 34 to move in opposite directions, thereby clamping the ring knife 17. When the placement plate 7 moves downward, it can contact the trigger 27 to start the upper motor 21. When the upper motor 21 is started, it can drive the two active groove wheels 46 to rotate. When the active groove wheel 46 rotates, the driven groove wheel 43 can be driven to rotate through the belt 22. When the driven groove wheel 43 located on the front side rotates, the rotating plate 16 can be driven to rotate through the adjacent central axis. When the rotating plate 16 rotates, the first arc-shaped protrusion contacts the second arc-shaped protrusion, so that a number of smear sponges 45 can move downward and contact the inner wall of the ring knife 17. , and apply vaseline on the inner wall of the ring knife 17. When the vaseline inside the ring knife 17 is applied, the cylinder 36 can be started to drive the ring knife 17 to move downward, contact the top of the concrete column 11, and press into the concrete column 11 to cut out a concrete module with the same diameter as the inner diameter of the ring knife 17. When the cutting is completed, the side motor 31 can be started to drive the adjacent gear 32 to rotate. When the gear 32 rotates, it can contact the rack 33, thereby driving the cutter 15 to move to the left to cut the concrete column 11, thereby separating the concrete module from the concrete column 11. Then the staff will take out the ring knife 17. When the concrete stress detection is completed, , the staff can re-fix the ring knife 17 and start the motor 28. The motor 28 can drive the convex plate 40 to rotate. When the convex plate 40 rotates, if the movable plate 38 contacts the conical surface of the convex plate 40, it can move downward. At the same time, the convex plate 40 can contact the convex block on the movable plate 38, thereby driving the movable plate 38 to rotate. When the movable plate 38 rotates to a certain angle, it can contact the fitting block 41 to position it. When the movable plate 38 rotates, it can drive the intermittent rotating plate 30 to rotate. When the intermittent rotating plate 30 rotates one hundred and eighty degrees, several cleaning brushes 19 can be moved to the top of the ring knife 17 to clean the remaining wet concrete inside the ring knife 17.

Claims

1. A concrete stress testing device, comprising a bottom plate (1), characterized in that: The bottom plate (1) has two openings at the top, and the two openings are symmetrically arranged front to back. A guide block (3) is fixedly connected at the center of the top of the bottom plate (1). Two sliders (4) are slidably connected to the top of the guide block (3). The two sliders (4) are symmetrically arranged front to back. The tops of the two sliders (4) are fixedly connected to lower clamping plates (8). The tops of the two lower clamping plates (8) are fixedly connected to arc-shaped plates (10). A concrete column (11) is commonly attached between the two arc-shaped plates (10). A placement plate (7) is attached to the bottom of the concrete column (11). The placement plate (7) is located between the two lower clamping plates (8). The bottom of the placement plate (7) is fixedly connected to vertical rods (26) near the left and right sides. The bottom ends of the two vertical rods (26) penetrate the inner cavity of the bottom plate (1). The outer sides of the vertical rods (26) are sleeved with first A spring (25), a connecting plate (6) is sleeved on the outer side of the vertical rod (26) near the bottom end, the top of the first spring (25) is fixedly connected to the bottom of the placement plate (7), the bottom of the first spring (25) is fixedly connected to the top of the connecting plate (6), a trigger (27) is installed on the top of the slider (4) near the rear side, a lifting block (24) is provided between the two support plates (2), the front and rear sides of the two sliders (4) are hinged with cranks (5), two annular openings are provided on the cranks (5), the left and right sides of the two lower clamping plates (8) are fixedly connected with first plug rods, the first plug rods are fitted with adjacent annular openings, the left and right sides of the lifting block (24) are fixedly connected with two second plug rods, a plurality of the second plug rods are fitted with adjacent annular openings, and the corresponding sides of the two connecting plates (6) are fixedly connected to the lifting block (24).

2. A concrete stress testing device according to claim 1, characterized in that: The tops of the two lower clamping plates (8) are fixedly connected to side plates (9), and the corresponding sides of the two side plates (9) are provided with sliding grooves. The inner cavities of the two sliding grooves are slidably connected to moving blocks (35) near the tops. The corresponding sides of the two moving blocks (35) are fixedly connected to clamping blocks (34). The corresponding sides of the two clamping blocks (34) are both in contact with the outer sides of the concrete column (11). The top of the side plate (9) located on the front side is fixedly connected to a push rod (13), and the top of the push rod (13) is fixedly connected to a guide plate (14). The top of the side plate (9) located on the rear side is fixedly connected to a protective cover (18). The bottoms of the two moving blocks (35) are fixedly connected to cylinders (36), and the bottom ends of the cylinders (36) are fixedly connected to the lower clamping plate (8). A ring knife (17) is commonly in contact with the two clamping blocks (34).

3. A concrete stress testing device according to claim 2, characterized in that: A motor (28) is provided on the front side of the protective cover (18), and a power output shaft of the motor (28) passes through the inner cavity of the protective cover (18). Two sleeve plates (39) are fixedly connected to the bottom of the inner cavity of the protective cover (18), and the two sleeve plates (39) are symmetrically arranged front to back. The power output shaft passes through the inner cavities of the two sleeve plates (39), and a convex plate (40) is fixedly sleeved on the outer side of the power output shaft, and the convex plate (40) is located between the two sleeve plates (39). A movable plate (38) is fitted on the top of the convex plate (40), and two convex blocks are arranged on the outer side of the movable plate (38), and the two convex blocks are symmetrically arranged left to right. A fitting block (41) is fixedly connected to the inner wall of the protective cover (18), and the fitting block (41) is fitted with the movable plate (38).

4. A concrete stress testing device according to claim 3, characterized in that: A column (42) is fixedly connected at the center of the top of the movable plate (38); an intermittent rotating plate (30) is provided at the top of the protective cover (18); a sleeve is fixedly connected to the bottom of the intermittent rotating plate (30); the bottom end of the sleeve passes through the inner cavity of the protective cover (18); the top end of the column (42) is slidably connected to the inner cavity of the sleeve; a third spring (37) is sleeved on the outer side of the column (42); the top end of the third spring (37) is fixedly connected to the bottom end of the sleeve; and the bottom end of the third spring (37) is fixedly connected to the bottom end of the movable plate (38).

5. A concrete stress testing device according to claim 4, characterized in that: The intermittent rotating plate (30) is provided with an upper motor (21) at the top, and two active groove wheels (46) are fixedly sleeved on the outer side of the power output shaft of the upper motor (21), and the two active groove wheels (46) are symmetrically arranged in an upper and lower manner. The two active groove wheels (46) have driven groove wheels (43) on the opposite sides, and a belt (22) is sleeved on the outer sides of the active groove wheels (46) and the driven groove wheels (43). The power output shaft of the upper motor (21) is connected to the bearing at the top of the intermittent rotating plate (30), and a central shaft is penetrated at the center of the two driven groove wheels (43) and fixedly connected thereto. The top of the intermittent rotating plate (30) is fixedly connected to a fixed plate (23) near the front and rear sides, and the bottom end of the central shaft penetrates the inner cavity of the fixed plate (23).

6. A concrete stress testing device according to claim 5, characterized in that: A rotating plate (16) is provided at the bottom of the fixed plate (23) located at the front side, and the bottom end of the central shaft located at the front side is fixedly connected to the top of the rotating plate (16). A second spring (29) is sleeved on the outer side of the central shaft, and the second spring (29) is located below the fixed plate (23). A first arc-shaped protrusion is provided near the edge of the top of the rotating plate (16), and a second arc-shaped protrusion is provided near the edge of the bottom of the guide plate (14). A plurality of connecting rods (47) are fixedly connected to the bottom of the rotating plate (16), and the plurality of connecting rods (47) are arranged in a circular array with the center of the rotating plate (16) as the center. A welding plate (48) is hinged at the bottom end of the connecting rod (47), and a fixing rod (44) is fixedly connected to the bottom of the welding plate (48). A smear sponge (45) is fixedly connected to the bottom end of the fixing rod (44), and a baffle (49) is fixedly connected to the bottom end of the connecting rod (47), and the baffle (49) is in contact with the welding plate (48).

7. A concrete stress testing device according to claim 6, characterized in that: A rotating plate (20) is provided at the bottom of the fixed plate (23) located at the rear side, the bottom end of the central axis located at the rear side is fixedly connected to the top of the rotating plate (20), and a plurality of cleaning brushes (19) are fixedly connected to the bottom end of the rotating plate (20), and the plurality of cleaning brushes (19) are arranged in a circular array with the center of the rotating plate (20) as the center.

8. A concrete stress testing device according to claim 7, characterized in that: Two L-shaped connecting plates (12) are fixedly connected to the right sides of the two side plates (9), and every two adjacent L-shaped connecting plates (12) are symmetrically arranged in an upper and lower direction. Two cutters (15) are provided on the right side of the concrete column (11), and the two cutters (15) are symmetrically arranged in an upper and lower direction. The front and rear sides of the cutters (15) are slidably connected to the adjacent L-shaped connecting plates (12). Two racks (33) are fixedly connected to the top of the cutters (15), and a gear (32) is meshed at the top of the rack (33) near the left side. A side motor (31) is fixedly connected to the center of the gear (32) located at the front side, and the bottom of the side motor (31) is fixedly connected to the adjacent L-shaped connecting plate (12).

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