A concrete air content testing device

Abstract

This utility model relates to the field of concrete air content testing technology, and discloses a concrete air content testing device, including a supporting base shell. A tamping mechanism is arranged on the top left side of the supporting base shell, and a fixing mechanism is arranged on the top right side of the supporting base shell. The fixing mechanism is used to fix the testing device. The tamping mechanism includes a mounting shell and a transmission belt. The bottom of the mounting shell is fixedly connected to the top left side of the supporting base shell. Transmission wheels are rotatably connected to the left side of the inner walls of both the supporting base shell and the mounting shell. The two transmission wheels are connected by a transmission belt. A motor is fixedly connected to the left side of the supporting base shell. In this utility model, the transmission belt causes the transmission wheels on both sides to rotate synchronously. Through the rotation of the measuring bowl and the reciprocating motion of the tamping rod, the concrete inside the measuring bowl is tamped in all directions, ensuring the depth, force, and uniformity of the tamping.

Description

Technical Field

[0001] This utility model relates to the field of concrete air content testing technology, and in particular to a concrete air content testing device. Background Technology

[0002] As a key indicator affecting the frost resistance, impermeability, and workability of concrete, the accurate testing of concrete air content is directly related to the durability and safety of engineering structures. In concrete production and scientific research, fluctuations in water content, fly ash content, sand ratio, and other material proportions can all affect the air content, leading to unstable concrete quality. The concrete air content testing device, through a standardized testing process, converts the air bubble content in concrete into a quantifiable physical quantity, providing data support for mix proportion optimization, quality control, and performance research. Its core technology lies in achieving accurate quantification and error control of air bubble volume through physical principles.

[0003] Early air content testing devices mainly consisted of a metal pressure vessel and a manual pressure regulating system. The pressure vessel was used to hold concrete and form a sealed testing space. The manual pressure regulating system calculated the air content by manually filling the container with air and reading the pressure. However, because non-air-containing air bubbles exist between large particles in the concrete mixture, the measured values ​​were distorted. To solve this problem, operators used a tamping rod to vibrate and compact the concrete, expelling the air. However, in actual use, the tamping depth, force, and uniformity of the manual tamping rod depended entirely on manual experience. When studying concrete with different sand ratios, admixtures, and aggregate gradations, it was difficult to accurately control the force applied manually, resulting in inconsistent compaction between different batches of samples. The tamping rod insertion depth also depended on the operator's experience, affecting the uniformity of air bubble distribution and interfering with the study of the influence of mix proportions. This failed to meet the needs of users. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a concrete air content testing device, which aims to improve the problem that the instability of manual operation of the tamping rod to release air in the prior art leads to differences in compaction and causes errors in air content measurement.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a concrete air content testing device, comprising a supporting bottom shell, a tamping mechanism provided on the top left side of the supporting bottom shell, and a fixing mechanism provided on the top right side of the supporting bottom shell, the fixing mechanism being used to fix the testing device.

[0006] The tamping mechanism includes a mounting shell and a transmission belt. The bottom of the mounting shell is fixedly connected to the top left side of the supporting base shell. Both the supporting base shell and the inner left side of the mounting shell are rotatably connected to transmission wheels. The two transmission wheels are connected by a transmission belt. A motor is fixedly connected to the left side of the supporting base shell. The output end of the motor passes through the supporting base shell and is fixedly connected to the left end of the corresponding transmission wheel. A crank is fixedly connected to the right end of the top transmission wheel. A rocker arm is rotatably connected to the right side of the other end of the crank. A sliding groove is provided in the upper middle part of the right side of the mounting shell. A sliding shell is slidably connected to the middle of the sliding groove. The right side of the other end of the rocker arm is rotatably connected to the left side of the sliding shell. A rotating component is provided on the right side of the bottom transmission wheel. A steering component is provided inside the sliding shell. A clamping component is provided on the front side of the steering component.

[0007] As a further description of the above technical solution:

[0008] The fixing mechanism includes a positioning frame, the bottom of which is rotatably connected to the top of the supporting base shell. The top left and right sides of the positioning frame are provided with wedge grooves, and the top of each of the two wedge grooves is slidably connected with a wedge block. The top of each of the two wedge blocks is provided with a limit groove, and the inner side of each of the two limit grooves is slidably connected with a bolt. The top left and right sides of the positioning frame are provided with threaded grooves.

[0009] As a further description of the above technical solution:

[0010] The rotating assembly includes a rotating rod, the left end of which is fixedly connected to the right end of the corresponding transmission wheel. A driving bevel gear is fixedly connected to the right end of the rotating rod. A rotating shaft is rotatably connected inside the supporting base shell. A driven bevel gear is fixedly connected to the bottom of the outer wall of the rotating shaft. The driving bevel gear and the driven bevel gear are meshed together. The top end of the rotating shaft penetrates the top of the inner wall of the supporting base shell.

[0011] As a further description of the above technical solution:

[0012] The bottom of the positioning frame is fixedly connected to the top of the rotating shaft, and the outer walls of the two bolts are respectively threaded to the inner walls of the corresponding threaded grooves.

[0013] As a further description of the above technical solution:

[0014] The steering assembly includes a connecting column, the bottom of which is rotatably connected to the inner bottom of the sliding housing. The connecting column has an inner cavity, and a spring is fixedly connected to the upper rear side of the inner cavity. A connecting rod is fixedly connected to the front end of the spring. The top of the front end of the connecting rod penetrates the upper front side of the inner wall of the inner cavity. A positioning column is fixedly connected to the bottom of the connecting rod. A positioning hole one is opened on the front side of the sliding housing, and a positioning hole two is opened on the right side of the sliding housing. The front end of the positioning column penetrates the lower front side of the inner wall of the inner cavity and is slidably connected to the inner side of the positioning hole one.

[0015] As a further description of the above technical solution:

[0016] The clamping assembly includes a connecting arm, the rear end of which is fixedly connected to the upper middle part of the front side of the outer wall of the connecting column. Both the left and right front ends of the connecting arm are rotatably connected to clamps. Both clamps have threaded holes on their left front ends, and the inner walls of the two threaded holes are threaded with the same bolt.

[0017] As a further description of the above technical solution:

[0018] A tamping rod is provided between the two adjacent clamps, and the outer wall of the tamping rod is provided with a scale.

[0019] As a further description of the above technical solution:

[0020] The positioning frame has a sliding connection to a measuring bowl, the top of which is covered with a bowl cover. The outer wall of the bowl cover is provided with clips, and the top of each of the clips is threaded with a bolt.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, the transmission belt causes the transmission wheels on both sides to rotate synchronously. The top transmission wheel causes the tamping rod to reciprocate and tamp the concrete through the crank and rocker arm. The bottom transmission wheel causes the rotating shaft to drive the positioning frame and the measuring bowl to rotate through the meshing of the active bevel gear and the driven bevel gear. Through the rotation of the measuring bowl and the reciprocating motion of the tamping rod, the concrete inside the measuring bowl is tamped in all directions, which can ensure the depth, force and uniformity of tamping.

[0023] 2. In this utility model, when the bolt rotates, it moves downward through the threaded groove. The head of the bolt compresses the wedge, causing the wedge to move downward as well. At this time, the bolt slides laterally inside the limiting groove, so that the wedges on both sides move obliquely downward through the corresponding wedge grooves to compress the middle measuring bowl, thereby fixing the measuring bowl and preventing it from falling off during the gas content test. Attached Figure Description

[0024] Figure 1A perspective view of a concrete air content testing device proposed in this utility model;

[0025] Figure 2 This is a front view of a concrete air content testing device proposed in this utility model;

[0026] Figure 3 This is a cross-sectional view of the supporting bottom shell of a concrete air content testing device proposed in this utility model.

[0027] Figure 4 This is a cross-sectional view of the connecting column of a concrete air content testing device proposed in this utility model.

[0028] Figure 5 This is a cross-sectional view of the positioning frame of a concrete air content testing device proposed in this utility model.

[0029] Legend:

[0030] 1. Support base shell; 2. Tamping mechanism; 201. Mounting shell; 202. Transmission wheel; 203. Transmission belt; 204. Motor; 205. Crank; 206. Rocker arm; 207. Slide groove; 208. Sliding housing; 209. Rotating assembly; 2091. Rotating rod; 2092. Driving bevel gear; 2093. Rotating shaft; 2094. Driven bevel gear; 210. Steering assembly; 2101. Connecting column; 2102. Inner cavity; 2103. Spring; 21 04. Connecting rod; 2105. Positioning post; 2106. Positioning hole one; 2107. Positioning hole two; 211. Clamping assembly; 2111. Connecting arm; 2112. Clamp; 2113. Bolt two; 3. Fixing mechanism; 301. Positioning frame; 302. Wedge groove; 303. Wedge block; 304. Limiting groove; 305. Bolt one; 306. Threaded groove; 4. Tamping rod; 5. Scale; 6. Measuring bowl; 7. Bowl cover; 8. Clamp; 9. Bolt three. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figure 1 , Figure 3 and Figure 4An embodiment of this utility model is provided: a concrete air content testing device, including a supporting bottom shell 1, a tamping mechanism 2 is provided on the top left side of the supporting bottom shell 1, the tamping mechanism 2 is used to discharge the gas in the concrete by tamping, and a fixing mechanism 3 is provided on the top right side of the supporting bottom shell, the fixing mechanism 3 is used to fix the testing device.

[0033] The tamping mechanism 2 includes a mounting shell 201 and a transmission belt 203. The bottom of the mounting shell 201 is fixedly connected to the top left side of the supporting base shell 1. Both the supporting base shell 1 and the inner left side of the mounting shell 201 are rotatably connected to transmission wheels 202. The two transmission wheels 202 are connected by the transmission belt 203. A motor 204 is fixedly connected to the left side of the supporting base shell 1. The output end of the motor 204 passes through the supporting base shell 1 and is fixedly connected to the left end of the corresponding transmission wheel 202. As the motor 204 rotates, the bottom transmission wheel 202 drives the top transmission wheel 202 to rotate synchronously via the transmission belt 203. A crank 205 is fixedly connected to the right end of the top transmission wheel 202. A rocker arm 206 is rotatably connected to the right side of the other end of the crank 205. The crank 205 converts the circular motion into the reciprocating oscillation of the rocker arm 206. A groove 207 is provided on the upper right side of the housing 201. The groove 207 limits and guides the sliding housing 208. The sliding housing 208 is slidably connected to the middle of the groove 207. The other end of the rocker arm 206 is rotatably connected to the left side of the sliding housing 208. The sliding housing 208 drives the rotating component 209 and the clamping component 211 to move up and down through the rocker arm 206. The rotating component 209 is provided on the right side of the bottom transmission wheel 202. The rotating component 209 is used to drive the measuring bowl 6 to rotate. While the tamping rod 4 tamps the concrete up and down, the tamping position changes when the measuring bowl 6 rotates. A steering component 210 is provided inside the sliding housing 208. The steering component 210 is used to move the tamping rod 4 aside when not in use. A clamping component 211 is provided on the front side of the steering component 210. The clamping component 211 is used to clamp the tamping rod 4.

[0034] The rotating assembly 209 includes a rotating rod 2091. The left end of the rotating rod 2091 is fixedly connected to the right end of the corresponding transmission wheel 202. The right end of the rotating rod 2091 is fixedly connected to a driving bevel gear 2092. The rotating rod 2091 is used to transmit the rotational force of the transmission wheel 202, so that the driving bevel gear 2092 can rotate. The inside of the supporting base shell 1 is rotatably connected to a rotating shaft 2093. The bottom of the outer wall of the rotating shaft 2093 is fixedly connected to a driven bevel gear 2094. The driving bevel gear 2092 and the driven bevel gear 2094 are meshed. The driving bevel gear 2092 drives the rotating shaft 2093 to rotate through the driven bevel gear 2094. The top end of the rotating shaft 2093 penetrates the top of the inner wall of the supporting base shell 1.

[0035] The steering assembly 210 includes a connecting post 2101. The bottom of the connecting post 2101 is rotatably connected to the inner bottom end of the sliding housing 208. An inner cavity 2102 is provided inside the connecting post 2101 to provide space for the spring 2103 and the connecting rod 2104 to reset. The spring 2103 is fixedly connected to the upper rear side of the inner cavity 2102, and the connecting rod 2104 is fixedly connected to the front end of the spring 2103. The spring 2103 can reset the connecting rod 2104. The top of the front end of the connecting rod 2104 extends through... The upper front part of the inner wall of the inner cavity 2102 is penetrated, and the bottom of the connecting rod 2104 is fixedly connected to the positioning post 2105. The front side of the sliding shell 208 is provided with positioning hole 1 2106, and the right side of the sliding shell 208 is provided with positioning hole 2107. The front end of the positioning post 2105 penetrates the lower front part of the inner wall of the inner cavity 2102 and is slidably connected to the inner side of positioning hole 1 2106. The positioning post 2105 is slidably connected to positioning hole 1 2106 and positioning hole 2107 respectively, so that the connecting rod 2104 can be fixed after turning.

[0036] The clamping assembly 211 includes a connecting arm 2111. The rear end of the connecting arm 2111 is fixedly connected to the upper middle part of the front side of the outer wall of the connecting column 2101. The left and right front ends of the connecting arm 2111 are rotatably connected with clamps 2112. The clamps 2112 are used to clamp the tamping rod 4 in the middle. The left front end of the two clamps 2112 is provided with threaded holes. The inner walls of the two threaded holes are threaded with the same bolt 2113. By tightening the bolt 2113, the clamps 2112 on both sides are tightened to firmly clamp the tamping rod 4.

[0037] Specifically, the measuring bowl 6 is placed inside the positioning frame 301. Concrete is then added to the measuring bowl 6 in batches. When air bubbles need to be expelled, the top transmission wheel 202 is driven by the motor 204, which converts the circular motion into the reciprocating swing of the rocker arm 206 via the crank 205. The swing of the rocker arm 206 causes the sliding shell 208 to reciprocate up and down within the sliding groove 207. The connecting column 2101 inside the sliding shell 208 is connected to the connecting arm 2111. The connecting arm 2111 uses a clamp 2112 and bolt 2113 to fix the tamping rod 4 at its end. The reciprocating motion of the sliding shell 208 causes the tamping rod 4 to reciprocate accordingly. The bottom transmission wheel 202 drives the driving bevel gear 2092 to rotate via the rotating rod 2091. The driving bevel gear 2092 meshes with the driven bevel gear 2094, thereby driving the rotating shaft 2093. The rotation of the shaft 2093 causes the measuring bowl 6 on top of the positioning frame 301 to rotate as well. While the measuring bowl 6 rotates, the tamping rod 4 tamps the concrete inside the measuring bowl 6 from all directions. The length of the tamping rod 4 entering the measuring bowl 6 can be adjusted by the clamp 2112 and the bolt 2113. This process ensures the depth, force and uniformity of tamping. When the tamping rod 4 is no longer needed, press the connecting rod 2104 to make the positioning post 2105 slide into the connecting post 2101 and apply pressure to the spring 2103. At this time, rotate the connecting post 2101 ninety degrees so that the positioning post 2105 coincides with the axis of the positioning hole 2106. After the spring 2103 returns to its original position, the positioning post 2105 slides and engages with the positioning hole 2106, thereby rotating the tamping rod 4 to one side and fixing it to ensure that it does not interfere with the measurement process.

[0038] Reference Figure 1 , Figure 3 and Figure 5 The fixing mechanism 3 includes a positioning frame 301. The bottom of the positioning frame 301 is rotatably connected to the top of the supporting base shell 1. The top left and right sides of the positioning frame 301 are provided with wedge grooves 302. The top of each of the two wedge grooves 302 is slidably connected with a wedge block 303. The wedge block 303 slides inside the wedge groove 302 and can squeeze and fix the measuring bowl 6. The top of each of the two wedge blocks 303 is provided with a limiting groove 304. The limiting groove 304 provides space for the relative movement of the bolt 305 and the wedge block 303 when the wedge block 303 moves. The inner side of each of the two limiting grooves 304 is slidably connected with a bolt 305. The top left and right sides of the positioning frame 301 are provided with threaded grooves 306. Tightening the bolt 305 will cause the bolt 305 to move downward through the threaded groove 306, while squeezing the wedge block 303.

[0039] The bottom of the positioning frame 301 is fixedly connected to the top of the rotating shaft 2093. The outer walls of the two bolts are respectively threaded to the inner walls of the corresponding threaded grooves 306. The positioning frame 301 drives the measuring bowl 6 to rotate through the rotating shaft 2093.

[0040] Specifically, when the measuring bowl 6 is placed inside the positioning frame 301, bolt 305 forms a threaded connection with the threaded groove 306 on the positioning frame 301. As bolt 305 rotates, it moves downward along the threaded groove 306 and applies pressure to wedge 303 through its head, causing wedge 303 to also move downward. At this time, wedge 303 moves obliquely through wedge groove 302. Limiting groove 304 slides relative to bolt 305, guiding the movement direction of wedge 303 and simultaneously acting as a limit. The wedges 303 on both sides move obliquely through their respective wedge grooves 302, applying pressure to the measuring bowl 6 in the middle, thereby firmly fixing the measuring bowl 6 and ensuring that it will not move or shift during the gas content test.

[0041] Reference Figure 1 and Figure 2 A tamping rod 4 is provided between the two clamps 2112. The tamping rod 4 is used to tamp the concrete inside the measuring bowl 6. The front side of the outer wall of the tamping rod 4 is provided with a scale 5. The tamping depth of the tamping rod 4 can be known through the scale 5. The measuring bowl 6 is slidably connected inside the positioning frame 301. The measuring bowl 6 is used to hold concrete. The top of the measuring bowl 6 is provided with a bowl cover 7. The bowl cover 7 is used for sealing and air content testing. The outer wall of the bowl cover 7 is provided with clips 8. The top of the multiple clips 8 is threaded with bolts 9. The clips 8 and bolts 9 cooperate to seal and fix the measuring bowl 6 and the bowl cover 7.

[0042] Specifically, after adding concrete to the measuring bowl 6 in batches, the depth of the tamping rod 4 is set according to different material compositions. Then, the concrete is tamped by the tamping mechanism 2 to disperse and expel non-air-containing air bubbles. After tamping is completed, the measuring bowl 6 is covered with the bowl cover 7. Then, the clips 8 are placed on the edges of the joint between the bowl cover 7 and the measuring bowl 6, and the bolts 9 are tightened to ensure the seal between the bowl cover 7 and the measuring bowl 6. Finally, the air content of the concrete inside the measuring bowl 6 is tested through the component on the top of the bowl cover 7.

[0043] Working principle: After placing the measuring bowl 6 inside the positioning frame 301, concrete is added to the measuring bowl 6 in stages. Then, the motor 204 is started, which drives the bottom drive wheel 202 to rotate. The bottom drive wheel 202 then drives the top drive wheel 202 to rotate synchronously through the drive belt 203. The bottom drive wheel 202 then drives the driving bevel gear 2092 to rotate through the rotating rod 2091. The driving bevel gear 2092 meshes with the driven bevel gear 2094 and the rotating shaft 2093 to rotate. Then, the rotating shaft 2093 drives the measuring bowl 6 at the top of the positioning frame 301 to rotate together. While the measuring bowl 6 is rotating, the top drive wheel 202 drives the crank 205 to rotate. The crank 205 converts the circular motion into the reciprocating oscillation of the rocker arm 206, which drives the sliding housing 208 to move up and down reciprocally inside the sliding groove 207. The connecting column 2101 inside the sliding housing 208 is connected to the connecting arm 2111. Next, the connecting arm 2111 clamps the tamping rod 4 at its end through the clamp 2112 and the bolt 2113. The reciprocating up and down movement of the sliding shell 208 drives the tamping rod 4 to reciprocate as well. Through the rotation of the measuring bowl 6 and the reciprocating movement of the tamping rod 4, the concrete inside the measuring bowl 6 is effectively tamped from all directions, ensuring the tamping depth, force and uniformity. At the same time, the clamp 2112 and the bolt 2113 can adjust the length of the tamping rod 4 entering the measuring bowl 6. When the tamping rod 4 is not needed, by pressing the connecting rod 2104, the connecting rod 2104 drives the positioning column 2105 to slide into the connecting column 2101, while compressing the spring 2103. At this time, the connecting column 2101 is rotated 90 degrees, so that the positioning column 2105 is aligned with the axis of the positioning hole 2106. The spring 2103 returns to its original position, so that the positioning column 2105 is engaged with the positioning hole 2106, thereby rotating the tamping rod 4 to one side and fixing it, without affecting the measurement.

[0044] Furthermore, when the measuring bowl 6 is placed in the positioning frame 301, the bolt 305 is threadedly connected to the threaded groove 306 of the positioning frame 301. When the bolt 305 rotates, it moves downward through the threaded groove 306. At the same time, the head of the bolt 305 squeezes the wedge 303, causing the wedge 303 to also move downward. At this time, the bolt 305 slides laterally inside the limiting groove 304, providing the direction of movement and limiting function for the wedge 303. This allows the wedges 303 on both sides to move obliquely downward through their corresponding wedge grooves 302, squeezing the measuring bowl 6 in the middle, thereby fixing the measuring bowl 6 and preventing shaking and displacement during the gas content test.

[0045] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A concrete air content testing device, comprising a supporting base shell (1), characterized in that: A tamping mechanism (2) is provided on the top left side of the supporting base shell (1), and a fixing mechanism (3) is provided on the top right side of the supporting base shell. The fixing mechanism (3) is used to fix the detection device. The tamping mechanism (2) includes a mounting shell (201) and a transmission belt (203). The bottom of the mounting shell (201) is fixedly connected to the top left side of the supporting base shell (1). Both the supporting base shell (1) and the left side of the mounting shell (201) are rotatably connected to transmission wheels (202). The two transmission wheels (202) are connected by the transmission belt (203). A motor (204) is fixedly connected to the left side of the supporting base shell (1). The output end of the motor (204) passes through the supporting base shell (1) and is fixedly connected to the left end of the corresponding transmission wheel (202). The top of the transmission wheel (202)... A crank (205) is fixedly connected to the right end, and a rocker arm (206) is rotatably connected to the other right end of the crank (205). A sliding groove (207) is provided in the upper middle part of the right side of the mounting housing (201). A sliding shell (208) is slidably connected to the middle part of the sliding groove (207). The other right end of the rocker arm (206) is rotatably connected to the left side of the sliding shell (208). A rotating component (209) is provided on the right side of the transmission wheel (202) at the bottom. A steering component (210) is provided inside the sliding shell (208). A clamping component (211) is provided on the front side of the steering component (210).

2. The concrete air content testing device according to claim 1, characterized in that: The fixing mechanism (3) includes a positioning frame (301), the bottom of which is rotatably connected to the top of the supporting base shell (1). The top left and right sides of the positioning frame (301) are provided with wedge grooves (302). The top of each of the two wedge grooves (302) is slidably connected with a wedge block (303). The top of each of the two wedge blocks (303) is provided with a limiting groove (304). The inner side of each of the two limiting grooves (304) is slidably connected with a bolt (305). The top left and right sides of the positioning frame (301) are provided with threaded grooves (306).

3. The concrete air content testing device according to claim 1, characterized in that: The rotating assembly (209) includes a rotating rod (2091), the left end of which is fixedly connected to the right end of the corresponding transmission wheel (202). The right end of the rotating rod (2091) is fixedly connected to a driving bevel gear (2092). The inside of the supporting base shell (1) is rotatably connected to a rotating shaft (2093). The bottom of the outer wall of the rotating shaft (2093) is fixedly connected to a driven bevel gear (2094). The driving bevel gear (2092) and the driven bevel gear (2094) are meshed. The top end of the rotating shaft (2093) penetrates the top of the inner wall of the supporting base shell (1).

4. The concrete air content testing device according to claim 2, characterized in that: The bottom of the positioning frame (301) is fixedly connected to the top of the rotating shaft (2093), and the outer walls of the two bolts (305) are respectively threaded to the inner walls of the corresponding threaded grooves (306).

5. The concrete air content testing device according to claim 1, characterized in that: The steering assembly (210) includes a connecting column (2101), the bottom of which is rotatably connected to the inner bottom end of the sliding housing (208). An inner cavity (2102) is formed inside the connecting column (2101), and a spring (2103) is fixedly connected to the upper rear side of the inner cavity (2102). A connecting rod (2104) is fixedly connected to the front end of the spring (2103), and the front end of the connecting rod (2104)... The top of the connecting rod (2104) is fixedly connected to the upper front part of the inner wall of the inner cavity (2102). The bottom of the connecting rod (2104) is fixedly connected to the positioning post (2105). The front side of the sliding shell (208) is provided with positioning hole one (2106). The right side of the sliding shell (208) is provided with positioning hole two (2107). The front end of the positioning post (2105) is connected to the lower front part of the inner wall of the inner cavity (2102) and is slidably connected to the inner side of positioning hole one (2106).

6. The concrete air content testing device according to claim 1, characterized in that: The clamping assembly (211) includes a connecting arm (2111), the rear end of which is fixedly connected to the upper middle part of the front side of the outer wall of the connecting column (2101). The left and right front ends of the connecting arm (2111) are rotatably connected to clamps (2112). The left front ends of the two clamps (2112) are provided with threaded holes, and the inner walls of the two threaded holes are threaded with the same bolt (2113).

7. The concrete air content testing device according to claim 6, characterized in that: A tamping rod (4) is provided between the two adjacent clamps (2112), and a scale (5) is provided on the front side of the outer wall of the tamping rod (4).

8. The concrete air content testing device according to claim 2, characterized in that: The positioning frame (301) is internally slidably connected to a measuring bowl (6), the top of the measuring bowl (6) is provided with a bowl cover (7), the outer wall of the bowl cover (7) is provided with clips (8), and the top of the multiple clips (8) is threadedly connected with bolts (9).

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