A concrete wall strength measuring instrument

Abstract

The present invention relates to the technical field of detection devices, and specifically to a concrete wall strength measuring instrument, including a housing, a striking rod, a bellows, a one-way air blowing mechanism and a one-way air intake mechanism. The striking rod is arranged along a first direction and is coaxial with the housing, and the one-way air blowing mechanism only allows gas to be discharged from the housing; and when the striking rod moves along the first direction toward a side away from the wall, the bellows can be stretched. A concrete wall strength measuring instrument of the present invention cooperates with a housing, a striking rod, a bellows, a one-way air blowing mechanism and a one-way air intake mechanism, and through the sliding of the striking rod in the housing and the stretching of the bellows, can drive the one-way air blowing mechanism to blow air to the striking rod during the detection of the wall, clean up the debris or fly ash on the striking rod, reduce the friction during the rebound of the striking rod, and improve the accuracy of the measurement.

Description

Technical Field

[0001] The invention relates to the technical field of detection devices, and in particular to a concrete wall strength measuring instrument. Background Art

[0002] Concrete rebound tester is usually used for strength testing of concrete walls. Its basic principle is to use a spring to drive a heavy hammer, which hits the impact rod in vertical contact with the concrete surface with constant kinetic energy, causing local concrete to deform and absorb part of the energy, while the other part of the energy is converted into the rebound kinetic energy of the heavy hammer. When the rebound kinetic energy is completely converted into potential energy, the heavy hammer rebounds to the maximum distance. The instrument displays the maximum rebound distance of the heavy hammer in the name of rebound value (the ratio of the maximum rebound distance to the initial length of the spring).

[0003] During operation, the existing concrete rebound test hammer needs to detect multiple areas on the same wall. Therefore, the debris or fly ash generated during the detection of the previous area will adhere to the impact rod. During the next detection, the friction force of the impact rod during the rebound process will increase, causing energy loss, which in turn affects the measurement accuracy of the next area. Summary of the invention

[0004] The invention provides a concrete wall strength measuring instrument to solve the problem that when the existing concrete rebound tester is in use, the debris or fly ash generated in the detection process of the previous area will adhere to the rebound rod, thereby affecting the measurement accuracy of the next area.

[0005] A concrete wall strength measuring instrument of the present invention adopts the following technical scheme: a concrete wall strength measuring instrument comprises a shell, a striking rod, a bellows, a one-way blowing mechanism and a one-way air intake mechanism; the shell is arranged along a first direction, the first direction is perpendicular to the wall, and the inner cavity of the shell is sealed; the striking rod is arranged along the first direction and is coaxial with the shell, one end of the striking rod is slidably installed in the shell, and the other end extends out of the shell and is arranged toward one side of the wall; the one-way air intake mechanism is arranged in the circumferential direction of the striking rod and is connected to the inner cavity of the shell; the one-way air intake mechanism only allows gas to be discharged from the shell; The mechanism is arranged on the shell and is connected with the internal cavity of the shell, and the one-way air intake mechanism only allows gas to enter the shell; the bellows is arranged along a first direction and is coaxial with the shell, and the bellows is in a compressed state in the initial state, and when the impact rod moves along the first direction toward the side away from the wall, the bellows can be stretched, and the bellows stretching can drive the one-way blowing mechanism to operate, and the gas can be discharged from the shell when the one-way blowing mechanism operates; when the impact rod moves along the first direction toward the side close to the wall, the bellows can be compressed, and the bellows compression can drive the one-way air intake mechanism to operate, and the gas can enter the shell when the one-way air intake mechanism operates.

[0006] Furthermore, it also includes a center rod and a snap hammer; the snap hammer, the center rod and the snap rod are arranged gradually close to one side of the wall in the first direction; the center rod is coaxially arranged with the outer shell and can be slidably arranged in the outer shell along the first direction; the two ends of the center rod along the first direction are respectively connected to the snap rod and the snap hammer, and the two ends of the bellows along the first direction are respectively fixedly installed on the inner wall of the outer shell and the snap hammer.

[0007] Furthermore, the impact rod is slidably connected to the center rod through a first elastic member.

[0008] Furthermore, the one-way blowing mechanism includes an air outlet pipe, an air blowing pipe and a first one-way valve. The air outlet pipe is arranged along the first direction, the air outlet pipe is connected to the outer shell, the air outlet pipe is located on the side of the outer shell along the first direction close to the wall, the air blowing pipe is arc-shaped, the air blowing pipe is located on the side of the air outlet pipe along the first direction close to the wall, one end of the air blowing pipe is fixedly connected to and connected with the air outlet pipe, the other end of the air blowing pipe is arranged toward the peripheral wall surface of the impact rod, the first one-way valve is located in the air blowing pipe, and the first one-way valve only allows gas to flow from the air outlet pipe to one side of the air blowing pipe.

[0009] Furthermore, the one-way air intake mechanism includes a second one-way valve, and the second one-way valve only allows gas to enter the shell from the outside.

[0010] Furthermore, the one-way blowing mechanism also includes a pressure valve, which is located in the air outlet pipe.

[0011] Furthermore, it also includes a moving ring, which is coaxially arranged with the impact rod and can move relative to the impact rod along a first direction. A plurality of support rods are evenly distributed in the circumferential direction of the moving ring. The plurality of support rods are all arranged along the first direction, and in an initial state, the support rods are located on the side of the impact rod close to the wall along the first direction.

[0012] Furthermore, the number of support rods is three.

[0013] Furthermore, the moving ring is threadedly connected to the impact rod, so that the moving ring can rotate around the impact rod while moving relative to the impact rod along the first direction toward the side away from the wall.

[0014] Furthermore, it also includes a trigger ring, which is coaxially arranged with the impact rod and sleeved on the impact rod, the trigger ring can rotate relative to the impact rod and move synchronously with the impact rod, the moving ring is sleeved on the trigger ring and spirally cooperates with the trigger ring, and the moving ring cooperates with the key slot of the impact rod, so that the moving ring can move along a first direction relative to the impact rod; a first spiral protrusion is arranged at the inner end of the trigger ring, and a trigger rod is arranged on the outer shell, the trigger rod is arranged along the first direction, the trigger rod is located on the side of the outer shell close to the wall along the first direction, and the movement of the impact rod along the first direction toward the side away from the wall can make the trigger rod abut against the first spiral protrusion, thereby prompting the trigger ring to rotate.

[0015] The beneficial effects of the present invention are as follows: a concrete wall strength measuring instrument of the present invention cooperates by setting a shell, a striking rod, a bellows, a one-way blowing mechanism and a one-way air intake mechanism. When in use, an operator holds the shell and makes the striking rod contact the wall vertically, and then pushes the shell to move along a first direction toward the side close to the wall, so that the striking rod slides and retracts into the shell along the first direction. In the process of the striking rod retracting into the shell, the gas inside the shell can be compressed to a certain extent. Since the bellows is in a compressed state in the initial state, when the striking rod moves along the first direction toward the side away from the wall, the bellows can be stretched. The stretching of the bellows will increase its volume in the shell, and further compress the gas inside the shell, so that the one-way blowing mechanism is started to discharge the gas from the shell, and blow air toward the outer peripheral wall of the striking rod. Through the sliding of the striking rod in the shell and the stretching of the bellows, the striking rod can be blown during the detection of the wall, and debris or fly ash on the striking rod can be cleaned, the friction during the rebound of the striking rod can be reduced, and the measurement accuracy can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the overall structure of an embodiment of a concrete wall strength measuring instrument of the present invention;

[0018] Figure 2 An exploded view of a part of the structure of an embodiment of a concrete wall strength measuring instrument of the present invention;

[0019] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0020] Figure 4 A partial cross-sectional view of a corrugated pipe of an embodiment of a concrete wall strength measuring instrument of the present invention in an initial state;

[0021] Figure 5 A partial cross-sectional view of a corrugated pipe in a stretched state of an embodiment of a concrete wall strength measuring instrument of the present invention;

[0022] Figure 6 for Figure 5 Enlarged view of point B in the middle.

[0023] In the figure: 100, housing; 110, trigger rod; 200, impact rod; 201, ring groove; 202, sliding key; 300, bellows; 400, one-way air blowing mechanism; 410, air outlet pipe; 420, air blowing pipe; 430, first one-way valve; 500, one-way air inlet mechanism; 600, center rod; 610, first elastic member; 700, impact hammer; 800, moving ring; 810, support rod; 900, trigger ring; 910, first spiral protrusion. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] An embodiment of a concrete wall strength measuring instrument of the present invention is as follows Figures 1 to 6 shown.

[0026] A concrete wall strength measuring instrument comprises a housing 100, a striking rod 200, a bellows 300, a one-way blowing mechanism 400 and a one-way air intake mechanism 500. The housing 100 is arranged along a first direction, the first direction is perpendicular to the wall, and the internal cavity of the housing 100 is sealed. The striking rod 200 is arranged along the first direction and is coaxial with the housing 100, one end of the striking rod 200 is slidably installed in the housing 100, and the other end extends out of the housing 100 and is arranged toward one side of the wall. The one-way blowing mechanism 400 is arranged in the circumferential direction of the striking rod 200 and is connected to the internal cavity of the housing 100; the one-way blowing mechanism 400 only allows gas to be discharged from the housing 100. The one-way air intake mechanism 500 is arranged on the housing 100 and is connected to the internal cavity of the housing 100, and the one-way air intake mechanism 500 only allows gas to enter the housing 100. The bellows 300 is arranged along a first direction and is coaxial with the outer shell 100. In an initial state, the bellows 300 is in a compressed state, and when the impact rod 200 moves along the first direction toward the side away from the wall, the bellows 300 can be stretched. The stretching of the bellows 300 can drive the one-way blowing mechanism 400 to operate, and when the one-way blowing mechanism 400 operates, the gas can be discharged from the outer shell 100; when the impact rod 200 moves along the first direction toward the side close to the wall, the bellows 300 can be compressed. The compression of the bellows 300 can drive the one-way air intake mechanism 500 to operate, and when the one-way air intake mechanism 500 operates, the gas can enter the outer shell 100.

[0027] In this embodiment, a shell 100, a striking rod 200, a bellows 300, a one-way blowing mechanism 400 and a one-way air intake mechanism 500 are arranged to cooperate with each other. When in use, the operator holds the shell 100 and makes the striking rod 200 contact the wall vertically, and then pushes the shell 100 to move toward the side close to the wall along a first direction, so that the striking rod 200 slides and retracts into the shell 100 along the first direction. In the process of the striking rod 200 retracting into the shell 100, the gas inside the shell 100 can be compressed to a certain extent. Since the bellows 300 is in a compressed state in the initial state, when the striking rod 200 moves away from the wall along the first direction, the gas inside the shell 100 can be compressed to a certain extent. When one side of the wall moves, the bellows 300 can be stretched, and the bellows 300 stretching will increase its volume in the shell 100, thereby further compressing the gas inside the shell 100, so that the one-way blowing mechanism 400 is activated to discharge the gas from the shell 100, and blow air to the outer peripheral wall of the impact rod 200. Through the sliding of the impact rod 200 in the shell 100 and the stretching of the bellows 300, the impact rod 200 can be blown during the detection of the wall, and the debris or fly ash on the impact rod 200 can be cleaned, reducing the friction during the rebound of the impact rod 200, and improving the accuracy of the measurement. When the impact rod 200 moves along the first direction to the side close to the wall to reset, the bellows 300 is compressed and reset, and the compression of the bellows 300 can drive the one-way air intake mechanism 500 to operate. When the one-way air intake mechanism 500 operates, the gas can enter the shell 100 to replenish the shell 100.

[0028] In this embodiment, a concrete wall strength measuring instrument further includes a center rod 600 and a snap hammer 700. The snap hammer 700, the center rod 600 and the snap rod 200 are arranged gradually close to one side of the wall in the first direction. The center rod 600 is coaxially arranged with the housing 100 and can be slidably arranged in the housing 100 along the first direction. The two ends of the center rod 600 along the first direction are respectively connected to the snap rod 200 and the snap hammer 700, and the two ends of the bellows 300 along the first direction are respectively fixedly installed on the inner wall of the housing 100 and the snap hammer 700.

[0029] Furthermore, the impact rod 200 is slidably connected to the central rod 600 through a first elastic member 610, the first elastic member 610 is arranged along the first direction, and the first elastic member 610 is a spring. The first elastic member 610 plays a buffering role during the retraction of the impact rod 200.

[0030] In this embodiment, by providing the center rod 600 and the spring hammer 700, when in use, when the spring hammer 700 slides and retracts into the housing 100 along the first direction, the first elastic member 610 will be compressed and the center rod 600 will be pushed to move along the first direction to the side away from the wall, and the movement of the center rod 600 will drive the spring hammer 700 fixed thereto to move, because the two ends of the bellows 300 along the first direction are respectively fixedly mounted on the inner wall of the housing 100 and the spring hammer 700. Therefore, when the spring hammer 700 moves along the first direction to the side away from the wall, the bellows 300 will be driven to move synchronously, so that the bellows 300 is stretched. When the impact rod 200 has been detected, the impact hammer 700 will rebound, thereby prompting the center rod 600 to move along the first direction toward the side close to the wall. The first elastic member 610 will reset and rebound and push the impact rod 200 to move along the first direction toward the side close to the wall. The impact hammer 700 will rebound and drive the bellows 300 fixed thereto to rebound, and the bellows 300 will reset and compress.

[0031] In this embodiment, the one-way blowing mechanism 400 includes an air outlet pipe 410, an air blowing pipe 420 and a first one-way valve 430. The air outlet pipe 410 is arranged along the first direction, the air outlet pipe 410 is connected to the housing 100, the air outlet pipe 410 is located on the side of the housing 100 close to the wall along the first direction, the air blowing pipe 420 is arc-shaped, the air blowing pipe 420 is located on the side of the air outlet pipe 410 close to the wall along the first direction, one end of the air blowing pipe 420 is fixedly connected and connected to the air outlet pipe 410, and the other end of the air blowing pipe 420 is arranged toward the peripheral wall surface of the impact rod 200, and the first one-way valve 430 is located in the air blowing pipe 420, and the first one-way valve 430 only allows gas to flow from the air outlet pipe 410 to one side of the air blowing pipe 420. The one-way air intake mechanism 500 includes a second one-way valve, and the second one-way valve only allows gas to enter the housing 100 from the outside.

[0032] In this embodiment, by providing an air outlet pipe 410, an air blowing pipe 420 and a first one-way valve 430, the gas in the inner cavity of the housing 100 will flow out from the first one-way valve 430 provided on the air blowing pipe 420 through the air outlet pipe 410 after being compressed, and the outer peripheral wall surface of the impact rod 200 will be blown and cleaned. After the impact rod 200 moves back to the side close to the wall along the first direction and the bellows 300 is restored and compressed, a negative pressure will be generated in the inner cavity of the housing 100, and then the external gas can enter the housing 100 through the second one-way valve to replenish the housing 100.

[0033] In another possible embodiment, the one-way blowing mechanism 400 further includes a pressure valve, which is located in the air outlet pipe 410 .

[0034] By further setting a pressure valve, after the gas passes through the air outlet pipe 410, it will be blocked by the pressure valve until the retraction of the impact rod 200 and the stretching of the bellows 300 reach a certain degree, so that the pressure of the compressed gas inside the housing 100 is greater than the pressure set by the pressure valve. At this time, the gas can break through the pressure valve and flow out from the blowing pipe 420 through the first one-way valve 430 to blow and clean the peripheral wall surface of the impact rod 200. That is, by setting the pressure valve, the blowing position of the impact rod 200 can be set, so that the gas gathers at the pressure valve, and the amount of gas to the position on the impact rod 200 that needs to be blown and cleaned is increased, and a certain place on the impact rod 200 is targeted for cleaning. For example, by adjusting the blowing position of the pressure valve, the pressure valve is released when the wall is close to the blowing pipe 420, and then the end surface of the impact rod 200 in contact with the wall and the wall are cleaned together.

[0035] In this embodiment, a concrete wall strength measuring instrument also includes a moving ring 800, which is coaxially arranged with the impact rod 200 and can move along a first direction relative to the impact rod 200. A plurality of support rods 810 are evenly distributed in the circumferential direction of the moving ring 800. The plurality of support rods 810 are all arranged along the first direction, and in the initial state, the support rods 810 are located on the side of the impact rod 200 close to the wall along the first direction, so that during detection, the support rods 810 contact the wall before the impact rod 200.

[0036] Specifically, the number of support rods 810 is three, which increases the stability of the support rods 810 contacting the wall. Alternatively, the number of support rods 810 may be four.

[0037] In one embodiment, the moving ring 800 is threadedly connected to the impact rod 200, so that the moving ring 800 can rotate around the impact rod 200 while moving relative to the impact rod 200 along the first direction toward the side away from the wall.

[0038] In this embodiment, a moving ring 800 is provided, and a plurality of support rods 810 are provided on the moving ring 800. During detection, the support rods 810 contact the wall surface before the impact rod 200. This allows the end surface of the impact rod 200 that contacts the wall surface to be cleaned when the gas is blown out from the housing 100 to clean the impact rod 200 during the process of the impact rod 200 retracting. On the basis of cleaning the peripheral wall surface of the impact rod 200, the overall cleaning effect of the impact rod 200 is improved. After the cleaning is completed, the operator can manually rotate the moving ring 800 so that the moving ring 800 moves on the impact rod 200 along the first direction away from the wall surface while rotating, so that the impact rod 200 can contact the wall surface and measure the wall surface.

[0039] Alternatively, in another possible embodiment, a concrete wall strength measuring instrument further includes a trigger ring 900, which is coaxially arranged with the impact rod 200 and sleeved on the impact rod 200, and the trigger ring 900 can rotate relative to the impact rod 200 and move synchronously with the impact rod 200, and the moving ring 800 is sleeved on the trigger ring 900 and spirally matched with the trigger ring 900, and the moving ring 800 is matched with the keyway of the impact rod 200, so that the moving ring 800 can move relative to the impact rod 200 along the first direction. A first spiral protrusion 910 is arranged at the inner end of the trigger ring 900, and a trigger rod 110 is arranged on the housing 100, and the trigger rod 110 is arranged along the first direction. The trigger rod 110 is located on the side of the housing 100 close to the wall along the first direction, and the impact rod 200 moves along the first direction to the side away from the wall, which can make the trigger rod 110 abut against the first spiral protrusion 910, thereby prompting the trigger ring 900 to rotate.

[0040] Specifically, an annular groove 201 is provided on the impact rod 200, and an annular protrusion is provided on the inner end surface of the trigger ring 900. The annular protrusion is slidably installed in the annular groove 201, so that the trigger ring 900 can rotate relative to the impact rod 200 and move synchronously with the impact rod 200.

[0041] A sliding key 202 is provided on the impact rod 200 , and the sliding key 202 is arranged along the first direction. A sliding groove is provided on the inner end surface of the moving ring 800 , and the sliding groove is slidably matched with the sliding key 202 .

[0042] The difference between this embodiment and the above-mentioned embodiment lies in that, by arranging the trigger rod 110 and the trigger ring 900 to cooperate, when the impact rod 200 is retracted to a certain extent into the housing 100, the trigger rod 110 will abut against the first spiral protrusion 910 on the trigger ring 900. By arranging the first spiral protrusion 910 with a larger spiral lead angle, after the first spiral protrusion 910 abuts against the trigger rod 110, the trigger ring 900 can generate a rotational force perpendicular to the first direction, thereby prompting the trigger ring 900 to rotate. The rotation of the trigger ring 900 will further drive the moving ring 800 spirally matched with it to move along the first direction, without the need for manual operation.

[0043] Alternatively, in another possible embodiment, the difference from the above embodiment is that the inner end of the movable ring 800 is a smooth structure, the trigger rod 110 is fixedly arranged on the trigger ring 900, and the trigger ring 900 can be driven to rotate by rotating the trigger rod 110, and then the spiral transmission of the trigger ring 900 and the movable ring 800 cooperates, so that the movable ring 800 can move along the first direction relative to the trigger ring 900 and the impact rod 200.

[0044] In combination with the above embodiments, the specific working principle and working process are as follows:

[0045] During measurement, the operator holds the housing 100 and makes the support rod 810 contact the wall vertically before the impact rod 200, and then pushes the housing 100 to move along the first direction toward the side close to the wall, so that the impact rod 200 slides and retracts into the housing 100 along the first direction. When the impact rod 200 slides and retracts into the housing 100 along the first direction, the first elastic member 610 is compressed and the center rod 600 is pushed to move along the first direction away from the wall. The movement of the center rod 600 will drive the impact hammer 700 fixed thereto to move. Since the two ends of the bellows 300 along the first direction are respectively fixedly mounted on the inner wall of the housing 100 and the impact hammer 700. Therefore, when the impact hammer 700 moves along the first direction away from the wall, one end of the bellows 300 will be driven to move synchronously, so that the bellows 300 is stretched.

[0046] The stretching of the bellows 300 will increase its volume in the shell 100, thereby further compressing the gas inside the shell 100. At the same time, the gas inside the shell 100 can be compressed to a certain extent during the process of the impact rod 200 retracting into the shell 100. Through the sliding of the impact rod 200 in the shell 100 and the stretching of the bellows 300, the gas inside the shell 100 can be compressed during the detection of the wall. After being compressed, the gas in the inner cavity of the shell 100 will flow out from the first one-way valve 430 provided on the blowing pipe 420 through the air outlet pipe 410, so as to blow and clean the outer wall surface of the impact rod 200.

[0047] Furthermore, by providing the support rod 810, when gas is blown out from the outer shell 100 to clean the impact rod 200, the end surface of the impact rod 200 in contact with the wall can also be cleaned, thereby improving the overall cleaning effect of the impact rod 200 on the basis of cleaning the outer peripheral wall surface of the impact rod 200.

[0048] When the impact rod 200 retracts to a certain extent into the housing 100, the trigger rod 110 will abut against the first spiral protrusion 910 on the trigger ring 900. By providing a first spiral protrusion 910 with a larger spiral lead angle, the trigger ring 900 can generate a rotational force perpendicular to the first direction after the first spiral protrusion 910 abuts against the trigger rod 110, thereby prompting the trigger ring 900 to rotate. The rotation of the trigger ring 900 will further drive the moving ring 800 spirally matched with it to move in the first direction, so that the impact rod 200 can contact the wall and measure the wall.

[0049] When the impact rod 200 has been detected, the impact hammer 700 will rebound, thereby prompting the center rod 600 to move along the first direction toward the side close to the wall. The first elastic member 610 will reset and rebound and push the impact rod 200 to move along the first direction toward the side close to the wall. The impact hammer 700 will rebound and drive the bellows 300 fixed thereto to rebound, and the bellows 300 will reset and compress.

[0050] By setting a second one-way valve, after the impact rod 200 moves back to the side close to the wall along the first direction and the bellows 300 is restored and compressed, a negative pressure is generated in the internal cavity of the shell 100, and then external gas can enter the shell 100 through the second one-way valve to replenish the shell 100.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A concrete wall strength measuring instrument, characterized in that: It includes a shell, a striking rod, a bellows, a one-way blowing mechanism and a one-way air intake mechanism; the shell is arranged along a first direction, the first direction is perpendicular to the wall, and the inner cavity of the shell is sealed; the striking rod is arranged along the first direction and is coaxial with the shell, one end of the striking rod is slidably installed in the shell, and the other end extends out of the shell and is arranged toward one side of the wall; the one-way blowing mechanism is arranged in the circumferential direction of the striking rod and is connected with the inner cavity of the shell; the one-way blowing mechanism only allows gas to be discharged from the shell; the one-way air intake mechanism is arranged on the shell and is connected with the inner cavity of the shell, and the one-way air intake mechanism only allows gas to enter the shell; the bellows is arranged along the first direction and is coaxial with the shell, In the initial state, the bellows is in a compressed state, and when the impact rod moves along the first direction to the side away from the wall, the bellows can be stretched, and the bellows stretching can drive the one-way blowing mechanism to operate, and the gas of the one-way blowing mechanism can be discharged from the shell; when the impact rod moves along the first direction to the side close to the wall, the bellows can be compressed, and the bellows compression can drive the one-way air intake mechanism to operate, and the gas of the one-way air intake mechanism can enter the shell, and also includes a moving ring, which is coaxially arranged with the impact rod and can move relative to the impact rod in the first direction, and a plurality of support rods are evenly distributed in the circumferential direction of the moving ring, and the plurality of support rods are all arranged along the first direction, and the initial In the initial state, the support rod is located on the side of the impact rod close to the wall along the first direction, and the moving ring is threadedly connected to the impact rod, so that the moving ring can rotate around the impact rod and move relative to the impact rod along the first direction to the side away from the wall. It also includes a trigger ring, which is coaxially arranged with the impact rod and sleeved on the impact rod. The trigger ring can rotate relative to the impact rod and move synchronously with the impact rod. The moving ring is sleeved on the trigger ring and spirally matched with the trigger ring, and the moving ring is matched with the key groove of the impact rod, so that the moving ring can move relative to the impact rod along the first direction; a first spiral protrusion is arranged at the inner end of the trigger ring, and a trigger rod is arranged on the outer shell. The trigger rod is arranged along the first direction. Located on the side of the shell close to the wall along the first direction, the impact rod moves along the first direction toward the side away from the wall so that the trigger rod can abut against the first spiral protrusion, thereby prompting the trigger ring to rotate. When gas is blown out from the shell to clean the impact rod, the end face of the impact rod in contact with the wall can be cleaned. When the impact rod retracts to a certain extent into the shell, the trigger rod will abut against the first spiral protrusion on the trigger ring, causing the trigger ring to generate a rotational force perpendicular to the first direction, thereby prompting the trigger ring to rotate. The rotation of the trigger ring will drive the moving ring that cooperates with its spiral to move in the first direction, so that the impact rod can contact the wall and measure the wall.

2. A concrete wall strength measuring instrument according to claim 1, characterized in that: It also includes a center rod and a spring hammer; the spring hammer, the center rod and the spring rod are arranged gradually close to one side of the wall in the first direction; the center rod is coaxially arranged with the outer shell and can be slidably arranged in the outer shell along the first direction; the two ends of the center rod along the first direction are respectively connected to the spring rod and the spring hammer, and the two ends of the bellows along the first direction are respectively fixedly installed on the inner wall of the outer shell and the spring hammer.

3. A concrete wall strength measuring instrument according to claim 2, characterized in that: The impact rod is slidably connected to the central rod through the first elastic member.

4. A concrete wall strength measuring instrument according to claim 1, characterized in that: The one-way blowing mechanism includes an air outlet pipe, an air blowing pipe and a first one-way valve. The air outlet pipe is arranged along a first direction, the air outlet pipe is connected to the outer shell, the air outlet pipe is located on the side of the outer shell along the first direction close to the wall, the air blowing pipe is arc-shaped, the air blowing pipe is located on the side of the air outlet pipe along the first direction close to the wall, one end of the air blowing pipe is fixedly connected to and connected with the air outlet pipe, the other end of the air blowing pipe is arranged toward the peripheral wall surface of the impact rod, the first one-way valve is located in the air blowing pipe, and the first one-way valve only allows gas to flow from the air outlet pipe to one side of the air blowing pipe.

5. A concrete wall strength measuring instrument according to claim 4, characterized in that: The one-way air intake mechanism comprises a second one-way valve, and the second one-way valve only allows gas to enter the housing from the outside.

6. A concrete wall strength measuring instrument according to claim 5, characterized in that: The one-way blowing mechanism also includes a pressure valve, which is located in the air outlet pipe.

7. A concrete wall strength measuring instrument according to claim 1, characterized in that: The support rods are set to three.

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