Concrete strength detection equipment for municipal road test

Abstract

The invention relates to the technical field of detection equipment, in particular to municipal road concrete strength detection equipment which comprises a shell assembly, a detection assembly and a sealing assembly, the detection assembly is connected to the shell assembly, and the sealing assembly is connected to the shell assembly; the shell assembly comprises a cylinder, a first end cover and a second end cover; the cylinder is provided with a containing cavity, the two ends of the cylinder are provided with a first port and a second port which are communicated with the containing cavity respectively, the first end cover is connected to one end of the cylinder and plugs the first port, and the second end cover is connected to the other end of the cylinder and plugs the second port; the detection assembly comprises a mounting plate, an elastic striking rod, a first main rod, a hammering block, an auxiliary rod, a second main rod and a pressure spring. According to the concrete strength detection equipment, the friction force borne by the elastic rod and the auxiliary rod can be eliminated through the elastic force, acting on the auxiliary rod and the second main rod, of the pressure spring, so that the accuracy of the detection result of the equipment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of testing equipment, and in particular to a testing equipment for testing concrete strength on a municipal road. Background Art

[0002] The rebound test hammer is a common testing equipment in the field of construction engineering, which is used to test the compressive strength of concrete. The basic principle of the rebound test hammer is: a spring drives a heavy hammer, which hits the impact rod in vertical contact with the concrete surface with constant kinetic energy, causing the local concrete to deform and absorb part of the energy, and the other part of the energy is converted into the rebound kinetic energy of the heavy hammer. When the rebound kinetic energy is fully converted into potential energy, the heavy hammer rebounds to the maximum distance, and the instrument displays the maximum rebound distance of the heavy hammer in the name of the rebound value (the ratio of the maximum rebound distance to the initial length of the spring).

[0003] The underwater rebound hammer is a rebound hammer used in underwater environments. In order to ensure the accuracy of the test results, a sealing structure needs to be set between the end cover and the impact rod to prevent water from entering the interior of the rebound hammer. The underwater rebound hammer will encounter a problem when in use: when the impact rod of the underwater rebound hammer moves, friction will be generated between the sealing structure and the impact rod, and water will also exert pressure on the impact rod. The above friction and water pressure will affect the movement of the impact rod, resulting in inaccurate test results. In order to improve the accuracy of the test results of the underwater rebound hammer, the above problems need to be solved urgently. Summary of the invention

[0004] Based on this, it is necessary to provide a concrete strength testing device for municipal road testing to address the problem that the accuracy of the current underwater rebound test results is affected by water pressure and friction.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A concrete strength testing device for municipal roads, comprising a shell component, a testing component and a sealing component, wherein the testing component is connected to the shell component, and the sealing component is connected to the shell component; the shell component comprises a cylinder, a first end cover and a second end cover; the cylinder is provided with a receiving cavity, and the two ends of the cylinder are respectively provided with a first port and a second port connected to the receiving cavity, the first end cover is connected to one end of the cylinder and blocks the first port, and the second end cover is connected to the other end of the cylinder and blocks the second port; the testing component comprises: a mounting plate, which is arranged in the receiving cavity and can move along the axial direction of the cylinder; a spring rod, which is passed through the first end cover and can move along the axial direction of the cylinder; the second end cover is connected to the second end of the cylinder and blocks the second port; the testing component comprises: a mounting plate, which is arranged in the receiving cavity and can move along the axial direction of the cylinder; a spring rod, which is passed through the first end cover and can move along the axial direction of the cylinder; the second end cover is connected to the second end of the cylinder and blocks the second end ... spring rod, which is connected to the first end cover and can move along the axial direction of the cylinder; the first end cover is connected to the second end of the cylinder and blocks the second end; the testing component comprises: a spring rod, which is connected to the first end cover and can move along the axial direction of the cylinder; the first end cover is connected to the second end of the cylinder and blocks the second end A main rod, one end of which is connected to the impact rod, and the other end is connected to the mounting plate; a hammer block is movably mounted on the first main rod, and the hammer block is used to slide along the axial direction of the first main rod to impact the impact rod, so that the impact rod moves along the axial direction of the cylinder; an auxiliary rod is passed through the second end cover and can move along the axial direction of the cylinder; a second main rod, one end of which is connected to the auxiliary rod, and the other end is connected to the mounting plate; a compression spring, one end of which abuts against the auxiliary rod, and the other end of which abuts against the second main rod; at least part of the structure of the sealing assembly is arranged on the first end cover, and is located between the first end cover and the impact rod; at least part of the structure of the sealing assembly is arranged on the second end cover, and is located between the second end cover and the auxiliary rod.

[0007] Furthermore, the first end cover is provided with a first clearance hole, and the second end cover is provided with a second clearance hole; the sealing assembly includes a first sealing ring and a second sealing ring; the first sealing ring is arranged on the inner side wall of the first clearance hole, the impact rod is passed through the first clearance hole, and the first sealing ring is clamped by the impact rod and the inner side wall of the first clearance hole; the second sealing ring is arranged on the inner side wall of the second clearance hole, the auxiliary rod is passed through the second clearance hole, and the second sealing ring is clamped by the auxiliary rod and the inner side wall of the second clearance hole.

[0008] Furthermore, the auxiliary rod includes a first rod body and a second rod body; the first rod body is passed through the second end cover, the second rod body is arranged in the accommodating cavity, one end of the second rod body is connected to the first rod body, and the diameter of the first rod body is larger than the diameter of the second rod body; the second main rod includes a third rod body and a fourth rod body; one end of the third rod body is connected to the mounting plate, and the other end is connected to one end of the fourth rod body, and the diameter of the third rod body is larger than the diameter of the fourth rod body; an insert hole is provided on the end surface of the fourth rod body away from the third rod body, and the insert hole extends along the axial direction of the cylinder, at least part of the structure of the second rod body is inserted into the insert hole, and the fourth rod body is provided with a discharge pipe connected to the insert hole; one end of the compression spring abuts against the end surface of the first rod body facing the second rod body, and the other end abuts against the end surface of the third rod body facing the fourth rod body.

[0009] Furthermore, the compression spring is sleeved on the outer periphery of the fourth rod body and fits with the outer side wall of the fourth rod body.

[0010] Furthermore, at least part of the structure of the second end cover is threadedly inserted into the cylinder; the concrete strength testing equipment also includes a driving assembly, which is connected between the discharge pipe and the second end cover; when the second rod body moves close to the third rod body, the driving assembly is used to drive the second end cover to rotate so as to move away from the first end cover so as to keep the air pressure in the accommodating chamber constant; when the second rod body moves away from the third rod body, the driving assembly is used to drive the second end cover to rotate so as to move close to the first end cover so as to keep the air pressure in the accommodating chamber constant.

[0011] Furthermore, the driving assembly includes: a telescopic oil cylinder, which is arranged on the inner side wall of the accommodating chamber; the telescopic oil cylinder includes a cylinder sleeve and a telescopic rod; the cylinder sleeve is arranged on the inner side wall of the accommodating chamber along the circumference of the cylinder, and a liquid inlet pipe is arranged on the cylinder sleeve; one end of the telescopic rod is inserted into the cylinder sleeve, and the other end is located outside the cylinder sleeve; a connecting piece, the connecting piece is connected to the part where the second end cap is threadedly connected to the cylinder, and one end of the telescopic rod away from the cylinder sleeve is connected to the connecting piece; an infusion hose, one end of the infusion hose is connected to the discharge pipe, and the other end is connected to the discharge pipe. The end is connected with the liquid inlet pipe; the plug-in hole is filled with oil; when the second rod body moves close to the third rod body, the oil flows from the plug-in hole through the liquid infusion hose into the cylinder sleeve, so that the telescopic rod extends from the cylinder sleeve along the circumference of the cylinder, and then the second end cover rotates away from the first end cover; when the second rod body moves away from the third rod body, the oil flows from the cylinder sleeve through the liquid infusion hose into the plug-in hole, so that the telescopic rod retracts into the cylinder sleeve along the circumference of the cylinder, and then the second end cover rotates close to the first end cover.

[0012] Furthermore, the concrete strength testing equipment also includes a guide limit assembly, which is arranged between the cylinder and the mounting plate. The guide limit assembly is used to guide the mounting plate to move only along the axial direction of the cylinder, and the guide limit assembly is also used to prevent the mounting plate from rotating.

[0013] Furthermore, the guide limiter assembly includes a guide limiter and a matching member; the guide limiter is arranged on the inner side wall of the accommodating cavity along the axial direction of the cylinder, the matching member is arranged on the mounting plate, and the guide limiter and the matching member are arranged in an embedded manner.

[0014] Furthermore, one of the guide limiting member and the matching member is a guide limiting strip, and the other is a guide limiting groove, and at least a portion of the structure of the guide limiting strip is embedded in the guide limiting groove.

[0015] Furthermore, a plurality of guide and limiter assemblies are provided, and the plurality of guide and limiter assemblies are arranged at intervals along the circumference of the cylinder.

[0016] The beneficial effects of the present invention are:

[0017] The present invention provides a concrete strength testing device for municipal roads, which is provided with a mounting plate, an auxiliary rod, a second main rod and a compression spring. The compression spring applies elastic force to the impact rod and the auxiliary rod. The elastic force can be balanced with the friction force suffered by the impact rod, the friction force suffered by the auxiliary rod, the water pressure suffered by the impact rod and the water pressure suffered by the auxiliary rod, so as to avoid as much as possible the friction force and the water pressure from hindering the movement of the impact rod, and further avoid as much as possible the negative influence of the friction force and the water pressure on the accuracy of the detection result.

[0018] Specifically, when the staff uses the above concrete strength testing equipment, they first need to perform a calibration operation before they can perform the testing operation. The specific process of the calibration operation is as follows: first place the entire concrete strength testing equipment underwater, and then push the auxiliary rod in the direction close to the second main rod. At this time, the mounting plate and the second main rod remain stationary, and the auxiliary rod moves relative to the second main rod in the direction close to the second main rod, thereby compressing the compression spring; when the auxiliary rod is pushed to the extreme position, the thrust applied to the auxiliary rod is removed, and the length of the compression spring will extend, thereby pushing the auxiliary rod away from the second main rod, until the length of the compression spring is finally stable and unchanged. After the above operation is completed, the compression spring is still in a compressed state. At this time, the compression spring will provide elastic force to the auxiliary rod and the impact rod (because the elastic force of the compression spring directly acts on the second main rod, the second main rod is connected to the mounting plate, the mounting plate is connected to the first main rod, and the first main rod is connected to the impact rod, it can be equivalent to the elastic force of the compression spring acting on the impact rod). At this time, in addition to the elastic force of the compression spring, the impact rod will also be affected by the friction force generated by the sealing assembly and the water pressure. The above three forces are balanced with each other, which can almost eliminate the influence of friction and water pressure on the movement of the impact rod, thereby improving the accuracy of the detection result. Similarly, in the above state, in addition to the elastic force of the compression spring, the auxiliary rod will also be affected by the friction force generated by the sealing assembly and the water pressure. The above three forces are balanced with each other, which can almost eliminate the influence of friction and water pressure on the movement of the auxiliary rod, thereby avoiding the auxiliary rod from affecting the movement of the impact rod.

[0019] To sum up, after the calibration operation is completed, the compression spring, together with the auxiliary rod and the second main rod, can eliminate the influence of friction and water pressure on the impact rod as much as possible, so that the impact rod can move smoothly in the subsequent detection process and complete the concrete strength detection work, so as to achieve the beneficial effect of improving the accuracy of the test results of the concrete strength testing equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a concrete strength testing device for municipal roads in one embodiment of the present invention;

[0021] Figure 2 for Figure 1The structural schematic diagram of the concrete strength testing equipment for municipal roads shown in another perspective;

[0022] Figure 3 for Figure 2 The structure shown is a cross-sectional view in the AA direction;

[0023] Figure 4 for Figure 2 The structure shown is a cross-sectional view along the BB direction.

[0024] in:

[0025] 100. Concrete strength testing equipment for municipal roads; 10. Shell assembly; 11. Cylinder; 111. Accommodating chamber; 112. First port; 113. Second port; 12. First end cover; 121. First clearance hole; 13. Second end cover; 131. Second clearance hole; 20. Testing assembly; 21. Mounting plate; 22. Impact rod; 23. First main rod; 24. Hammer block; 25. Auxiliary rod; 251. First rod body; 252. Second rod body; 26. Second main rod; 261. Third rod body; 262. Fourth rod body; 263. Plug-in hole; 27. Compression spring; 28. Discharge pipe; 30. Driving assembly; 31. Telescopic cylinder; 311. Cylinder sleeve; 312. Telescopic rod; 32. Connector; 33. Liquid inlet pipe. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0028] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] See also Figure 1 , Figure 2 and Figure 3 The present invention provides a concrete strength testing device 100 for municipal roads, which is used to test the strength of concrete located underwater. The above-mentioned concrete strength testing device includes a shell component 10, a detection component 20 and a sealing component. The shell component 10 is the shell structure of the concrete strength testing device, and the shell component 10 is used to install and protect other components of the concrete strength testing device. The detection component 20 is used to detect the strength of concrete, and the detection component 20 is connected to the shell component 10. The sealing component is the sealing structure of the concrete strength testing device, and the sealing component is connected to the shell component 10 to prevent external water from entering the shell component 10 to affect the detection result of the concrete strength testing device.

[0030] The housing assembly 10 includes a cylinder 11, a first end cap 12 and a second end cap 13. The cylinder 11 is the main structure of the housing assembly 10, and at least part of the structure of the cylinder 11 is a cylindrical cylindrical structure, that is, the cylinder 11 has an axial direction. As a specific example, in the present embodiment, a part of the structure of the cylinder 11 is a cylindrical cylindrical structure, and the other part of the cylinder 11 is a conical cylindrical structure. In some other embodiments, the cylinder 11 can be a cylindrical cylindrical structure as a whole, which is not limited to this. The cylinder 11 is provided with a accommodating chamber 111, and the two ends of the cylinder 11 are respectively provided with a first port 112 and a second port 113 connected to the accommodating chamber 111. The first end cap 12 is connected to one end of the cylinder 11 and blocks the first port 112, and the second end cap 13 is connected to the other end of the cylinder 11 and blocks the second port 113. Specifically, the first end cap 12 is connected to one end of the cylinder 11 where the first port 112 is located and blocks the first port 112 , and the second end cap 13 is connected to one end of the cylinder 11 where the second port 113 is located and blocks the second port 113 .

[0031] The detection assembly 20 includes a mounting plate 21 , a striking rod 22 , a first main rod 23 , a hammer block 24 , an auxiliary rod 25 , a second main rod 26 and a compression spring 27 .

[0032] The mounting plate 21 is a substantially plate-shaped structure. The mounting plate 21 is disposed in the accommodating cavity 111 and can move along the axial direction of the cylinder 11 . The mounting plate 21 is used to mount other components of the detection assembly 20 .

[0033] The impact rod 22 is a roughly round rod-shaped structure. The impact rod 22 is inserted through the first end cover 12 and can move along the axial direction of the cylinder 11. The impact rod 22 is used to impact the concrete to be tested under the impact of the hammer block 24 to complete the strength test of the concrete.

[0034] The first main rod 23 is roughly a round rod structure, one end of the first main rod 23 is connected to the impact rod 22, and the other end is connected to the mounting plate 21. The first main rod 23 and the impact rod 22 can be directly connected or indirectly connected through other intermediate parts, and the first main rod 23 and the mounting plate 21 can be directly connected or indirectly connected through other intermediate parts, which is not limited. As a specific example, in this embodiment, the first main rod 23 is coaxial with the impact rod 22 and the cylinder 11, and the diameter of the first main rod 23 is smaller than the diameter of the impact rod 22.

[0035] The hammer block 24 is a block structure, which can be movably mounted on the first main rod 23. The hammer block 24 is used to slide along the axial direction of the first main rod 23 to impact the impact rod 22, so that the impact rod 22 moves along the axial direction of the cylinder 11, thereby completing the strength test of the concrete.

[0036] The auxiliary rod 25 is roughly a round rod structure. The auxiliary rod 25 is inserted into the second end cover 13 and can move along the axial direction of the cylinder 11. The auxiliary rod 25 is used to cooperate with the second main rod 26 and the compression spring 27 to minimize the influence of friction and water pressure on the movement of the impact rod 22.

[0037] The second main rod 26 is roughly a round rod structure, one end of the second main rod 26 is connected to the auxiliary rod 25, and the other end is connected to the mounting plate 21. The second main rod 26 and the auxiliary rod 25 can be directly connected (for example, the auxiliary rod 25 can be slidably sleeved on one end of the second main rod 26), or indirectly connected through other intermediate parts. The second main rod 26 and the mounting plate 21 can be directly connected or indirectly connected through other intermediate parts, which is not limited. As a specific example, in this embodiment, the second main rod 26 is coaxially arranged with the auxiliary rod 25 and the cylinder 11.

[0038] The compression spring 27 is disposed in the accommodating cavity 111, one end of the compression spring 27 abuts against the auxiliary rod 25, and the other end abuts against the second main rod 26. The compression spring 27 is used to cooperate with the second main rod 26 and the auxiliary rod 25 to minimize the influence of friction and water pressure on the movement of the impact rod 22.

[0039] At least part of the structure of the sealing assembly is disposed on the first end cover 12 and is located between the first end cover 12 and the impact rod 22 to prevent water from penetrating into the interior of the cylinder 11 from the gap between the first end cover 12 and the impact rod 22. At least part of the structure of the sealing assembly is disposed on the second end cover 13 and is located between the second end cover 13 and the auxiliary rod 25 to prevent water from penetrating into the interior of the cylinder 11 from the gap between the second end cover 13 and the auxiliary rod 25.

[0040] When the staff uses the above concrete strength testing equipment, they need to perform calibration operation first, and then perform the testing operation. The specific process of the calibration operation is as follows: place the entire concrete strength testing equipment underwater, and then push the auxiliary rod 25 in the direction close to the second main rod 26. At this time, the mounting plate 21 and the second main rod 26 remain stationary, and the auxiliary rod 25 moves relative to the second main rod 26 in the direction close to the second main rod 26, thereby compressing the compression spring 27; when the auxiliary rod 25 is pushed to the extreme position, the thrust applied to the auxiliary rod 25 is removed, and the length of the compression spring 27 will extend, thereby pushing the auxiliary rod 25 in the direction away from the second main rod 26, until the length of the compression spring 27 is finally stable and unchanged. After the length of the compression spring 27 is stabilized and unchanged, the compression spring 27 is still in a compressed state. At this time, the compression spring 27 provides an elastic force F1 to the auxiliary rod 25 and an elastic force F2 to the impact rod 22 (because the elastic force of the compression spring 27 directly acts on the second main rod 26, the second main rod 26 is connected to the mounting plate 21, the mounting plate 21 is connected to the first main rod 23, and the first main rod 23 is connected to the impact rod 22, so it can be equivalent to the elastic force of the compression spring 27 acting on the impact rod 22). F1 and F2 are of the same magnitude and opposite in direction. The auxiliary rod 25 is also subjected to the friction force F3 generated by the sealing assembly and the pressure F4 provided by the water. The directions of F3 and F4 are the same and opposite to the direction of F1. The three satisfy the magnitude relationship: F3+F4=F1. Similarly, in addition to the elastic force F2, the impact rod 22 is also subjected to the friction force F5 generated by the sealing component and the pressure F6 provided by the water. The directions of F5 and F6 are the same and opposite to the direction of F2. The three satisfy the size relationship: F5+F6=F2.

[0041] Through the above settings, after the calibration operation is completed, the compression spring 27 cooperates with the auxiliary rod 25 and the second main rod 26 to eliminate the influence of friction and water pressure on the impact rod 22 as much as possible, so that the impact rod 22 can move smoothly and complete the concrete strength detection work in the subsequent detection process, so as to achieve the beneficial effect of improving the accuracy of the detection results of the concrete strength detection equipment. It should be noted that during the detection operation, the impact rod 22, the first main rod 23, the mounting plate 21, the second main rod 26, the compression spring 27 and the auxiliary rod 25 are almost kept in synchronous movement.

[0042] See also Figure 3In some embodiments, the first end cover 12 is provided with a first clearance hole 121, and the second end cover 13 is provided with a second clearance hole 131. The first clearance hole 121 and the second clearance hole 131 are both coaxially arranged with the cylinder 11. The sealing assembly includes a first sealing ring and a second sealing ring (neither of which is shown in the figure). The first sealing ring is arranged on the inner side wall of the first clearance hole 121, and the impact rod 22 is penetrated through the first clearance hole 121, and the first sealing ring is clamped by the impact rod 22 and the inner side wall of the first clearance hole 121. The second sealing ring is arranged on the inner side wall of the second clearance hole 131, and the auxiliary rod 25 is penetrated through the second clearance hole 131, and the second sealing ring is clamped by the auxiliary rod 25 and the inner side wall of the second clearance hole 131.

[0043] Through the above arrangement, the impact rod 22 and the inner side wall of the first clearance hole 121 jointly clamp the first sealing ring to form a sealing structure, which can prevent water from entering the interior of the cylinder 11 from the gap between the impact rod 22 and the inner side wall of the first clearance hole 121, thereby avoiding a negative impact on the accuracy of the detection result. The auxiliary rod 25 and the inner side wall of the second clearance hole 131 jointly clamp the second sealing ring to form a sealing structure, which can prevent water from entering the interior of the cylinder 11 from the gap between the auxiliary rod 25 and the inner side wall of the second clearance hole 131, thereby avoiding a negative impact on the accuracy of the detection result.

[0044] In some embodiments, the auxiliary rod 25 includes a first rod body 251 and a second rod body 252. The first rod body 251 and the second rod body 252 are both roughly round rod-shaped structures and are coaxially arranged. The first rod body 251 is inserted into the second end cover 13, and the second rod body 252 is arranged in the accommodating cavity 111. One end of the second rod body 252 is connected to the first rod body 251, and the diameter of the first rod body 251 is greater than the diameter of the second rod body 252.

[0045] The second main rod 26 includes a third rod body 261 and a fourth rod body 262. The third rod body 261 and the fourth rod body 262 are both roughly round rod-shaped structures and are coaxially arranged. One end of the third rod body 261 is connected to the mounting plate 21, and the other end is connected to one end of the fourth rod body 262. The diameter of the third rod body 261 is greater than the diameter of the fourth rod body 262. The end surface of the fourth rod body 262 away from the third rod body 261 is provided with a plug hole 263, and the plug hole 263 extends along the axial direction of the cylinder 11. At least part of the structure of the second rod body 252 is inserted into the plug hole 263, and the fourth rod body 262 is provided with a discharge pipe 28 connected to the plug hole 263.

[0046] One end of the compression spring 27 abuts against the end surface of the first rod 251 facing the second rod 252, and the other end abuts against the end surface of the third rod 261 facing the fourth rod 262. The ends of the compression spring 27 can be bonded or welded to the end surface of the first rod 251 facing the second rod 252 and the end surface of the third rod 261 facing the fourth rod 262.

[0047] Through the above arrangement, when the staff pushes the auxiliary rod 25 toward the direction close to the second main rod 26, the first rod body 251 and the third rod body 261 will jointly squeeze the compression spring 27, so that the compression spring 27 generates an elastic force on the auxiliary rod 25 and the second main rod 26. Due to the force transmission effect, the compression spring 27 further generates an elastic force on the impact rod 22, so as to subsequently achieve a balance between the friction force suffered by the impact rod 22 and the water pressure.

[0048] In some embodiments, the diameter of the first rod body 251 is equal to the diameter of the impact rod 22. Through the above arrangement, since the impact rod 22 and the auxiliary rod 25 almost keep moving synchronously during the detection operation after the calibration operation is completed, the length of the impact rod 22 inserted / extended into the cylinder 11 is almost the same as the length of the auxiliary rod 25 (specifically the first rod body 251) extended / inserted into the cylinder 11, and since the diameter of the first rod body 251 is equal to the diameter of the impact rod 22, it can be ensured that the sum of the volumes of the impact rod 22 and the first rod body 251 in the accommodating chamber 111 during the detection process is almost fixed, thereby ensuring that the air pressure in the accommodating chamber 111 is basically maintained constant during the detection process, so as to minimize the influence of the air pressure change in the accommodating chamber 111 on the accuracy of the detection result.

[0049] In some embodiments, the compression spring 27 is sleeved on the outer circumference of the fourth rod 262 and fits with the outer side wall of the fourth rod 262. Through the above arrangement, the fourth rod 262 can guide and limit the compression spring 27, so that the compression spring 27 can stably expand and contract along the axial direction of the cylinder 11 to avoid the expansion and contraction direction of the compression spring 27 from being skewed, thereby achieving the effect of improving the stability of the compression spring 27.

[0050] In some embodiments, at least part of the structure of the second end cap 13 is threadedly inserted into the cylinder 11. The concrete strength testing device further includes a driving assembly 30, which is connected between the discharge pipe 28 and the second end cap 13. When the second rod body 252 moves close to the third rod body 261 (i.e., during the calibration operation, the staff pushes the auxiliary rod 25, and the second rod body 252 is continuously inserted into the plug hole 263), the driving assembly 30 is used to drive the second end cap 13 to rotate to move away from the first end cap 12, so that the air pressure in the accommodating chamber 111 remains constant. When the second rod body 252 moves away from the third rod body 261 (i.e., during the calibration operation, the staff removes the force on the auxiliary rod 25, and the compression spring 27 pushes the auxiliary rod 25 to move, and the second rod body 252 is continuously moved out of the plug hole 263), the driving assembly 30 is used to drive the second end cap 13 to rotate to move close to the first end cap 12, so that the air pressure in the accommodating chamber 111 remains constant.

[0051] Through the above arrangement, when the second rod 252 moves closer to the third rod 261, the volume of the first rod 251 entering the accommodating chamber 111 is constantly increasing. Therefore, if the volume of the accommodating chamber 111 remains unchanged, the pressure of the gas in the accommodating chamber 111 will increase, thereby affecting the force of the impact rod 22, thereby reducing the accuracy of the detection result. However, due to the provision of the drive assembly 30, when the second rod 252 moves closer to the third rod 261, the drive assembly 30 is used to drive the second end cover 13 to rotate to move away from the first end cover 12, so that the volume of the accommodating chamber 111 can be increased, so that the gas pressure in the accommodating chamber 111 remains constant, thereby improving the accuracy of the detection result. Similarly, when the second rod 252 moves away from the third rod 261, the volume of the first rod 251 in the accommodating chamber 111 is constantly decreasing. Therefore, if the volume of the accommodating chamber 111 remains unchanged, the pressure of the gas in the accommodating chamber 111 will decrease, thereby affecting the force of the impact rod 22, thereby reducing the accuracy of the detection result. However, due to the provision of the driving assembly 30, when the second rod 252 moves away from the third rod 261, the driving assembly 30 is used to drive the second end cap 13 to rotate so as to move in a direction close to the first end cap 12, so that the volume of the accommodating chamber 111 can be reduced, so that the air pressure in the accommodating chamber 111 is kept constant, so as to improve the accuracy of the detection result. It should be noted that in order to achieve the technical effect of constant air pressure in the accommodating chamber 111, it is necessary to design the detection device according to multiple structural parameters, and the above-mentioned multiple structural parameters at least include: the diameter of the first rod 251, the pitch of the second end cap 13, the speed at which the driving assembly 30 drives the second end cap 13 to rotate, etc.

[0052] See also Figure 3 and Figure 4 In some embodiments, the driving assembly 30 includes a telescopic cylinder 31, a connecting piece 32 and an infusion hose (not shown in the figure).

[0053] The telescopic oil cylinder 31 is arranged on the inner side wall of the accommodating chamber 111. The telescopic oil cylinder 31 includes a cylinder sleeve 311 and a telescopic rod 312. The cylinder sleeve 311 is roughly a curved cylindrical structure, and the telescopic rod 312 is roughly a curved round rod structure. The cylinder sleeve 311 is arranged on the inner side wall of the accommodating chamber 111 along the circumference of the cylinder 11, and a liquid inlet pipe 33 is arranged on the cylinder sleeve 311. One end of the telescopic rod 312 is inserted into the cylinder sleeve 311, and the other end is located outside the cylinder sleeve 311.

[0054] The connecting member 32 is connected to the threaded connection portion of the second end cap 13 and the cylinder 11, and the end of the telescopic rod 312 away from the cylinder sleeve 311 is connected to the connecting member 32. The connecting member 32 can be a plate-like structure, a strip-like structure, a block-like structure, or any other structure, and the connecting member 32 is used to achieve an indirect connection between the second end cap 13 and the telescopic rod 312.

[0055] One end of the infusion hose is connected to the discharge pipe 28 , and the other end is connected to the liquid inlet pipe 33 .

[0056] The plug hole 263 is filled with oil. When the second rod 252 moves close to the third rod 261 (i.e., during the calibration operation, when the staff pushes the auxiliary rod 25, the second rod 252 is continuously inserted into the plug hole 263), the oil flows from the plug hole 263 through the infusion hose into the cylinder sleeve 311, so that the telescopic rod 312 extends from the cylinder sleeve 311 along the circumference of the cylinder 11, thereby rotating the second end cover 13 away from the first end cover 12. When the second rod body 252 moves away from the third rod body 261 (i.e., during the calibration operation, the staff removes the force on the auxiliary rod 25 and the compression spring 27 pushes the auxiliary rod 25 to move, and during this stage, the second rod body 252 is continuously moved out of the plug hole 263), the oil flows from the cylinder sleeve 311 through the infusion hose into the plug hole 263, so that the telescopic rod 312 retracts into the cylinder sleeve 311 along the circumference of the cylinder 11, thereby causing the second end cover 13 to rotate close to the first end cover 12.

[0057] Through the above arrangement, when the second rod body 252 moves close to the third rod body 261, the second rod body 252 is continuously inserted into the plug hole 263, thereby squeezing the oil in the plug hole 263 into the cylinder sleeve 311, so that the telescopic rod 312 extends from the cylinder sleeve 311 along the circumference of the cylinder 11. The extension of the telescopic rod 312 will push the connecting piece 32 to drive the second end cover 13 to rotate along the circumference of the cylinder 11, so that the second end cover 13 rotates away from the first end cover 12, so as to increase the volume of the accommodating chamber 111, thereby ensuring the constant air pressure in the accommodating chamber 111. When the second rod body 252 moves away from the third rod body 261, the second rod body 252 is continuously moved out of the plug hole 263. At this time, the oil will flow back from the cylinder sleeve 311 into the plug hole 263, so that the telescopic rod 312 is retracted into the cylinder sleeve 311 along the circumference of the cylinder 11. The shortening of the telescopic rod 312 will drive the connecting piece 32 and the second end cover 13 to rotate in the opposite direction along the circumference of the cylinder 11, so that the second end cover 13 rotates close to the first end cover 12 to reduce the volume of the accommodating chamber 111, thereby ensuring the constant air pressure in the accommodating chamber 111.

[0058] In some embodiments, the concrete strength testing equipment also includes a guide limit assembly (not shown in the figure), which is arranged between the cylinder 11 and the mounting plate 21. The guide limit assembly is used to guide the mounting plate 21 to move only along the axial direction of the cylinder 11. The guide limit assembly is also used to prevent the mounting plate 21 from rotating to improve the stability of the mounting plate 21 during the movement.

[0059] In some embodiments, the guide limiter assembly includes a guide limiter and a matching member (neither of which is shown in the figure). The guide limiter is arranged on the inner side wall of the accommodating cavity 111 along the axial direction of the cylinder 11, and the matching member is arranged on the mounting plate 21, and the guide limiter and the matching member are arranged in an interlocking manner. Through the above arrangement, the mounting plate 21 can only move along the extension direction of the guide limiter (i.e., the axial direction of the cylinder 11), which can improve the stability of the movement of the mounting plate 21. In addition, since the guide limiter and the matching member are arranged in an interlocking manner, the guide limiter can also prevent the mounting plate 21 from rotating, thereby further improving the stability and reliability of the mounting plate 21 during the movement, that is, improving the accuracy of the detection results of the concrete detection equipment.

[0060] In some embodiments, one of the guide limiter and the matching member is a guide limiter strip, and the other is a guide limiter groove, and at least part of the structure of the guide limiter strip is embedded in the guide limiter groove. For example, the guide limiter can be a guide limiter strip arranged on the inner side wall of the accommodating cavity 111 along the axial direction of the cylinder 11, and the matching member can be a guide limiter groove arranged on the mounting plate 21; or, the guide limiter can be a guide limiter groove arranged on the inner side wall of the accommodating cavity 111 along the axial direction of the cylinder 11, and the matching member can be a guide limiter strip arranged on the mounting plate 21, and this is not limited.

[0061] In some other embodiments, the wire stopper may also be a slide rail arranged on the inner wall of the accommodating cavity 111 along the axial direction of the cylinder 11, and the matching member may also be a slider arranged on the mounting plate 21, and the slider is embedded in the slide rail.

[0062] In some embodiments, the guide and limit assembly is provided in multiple groups, such as two groups, three groups, four groups, etc., and the multiple groups of guide and limit assembly are arranged at intervals along the circumference of the cylinder 11. Through the above arrangement, the stability and reliability of the movement of the mounting plate 21 can be further improved.

[0063] To sum up, an embodiment of the present invention provides a concrete strength testing device 100 for municipal roads, which is provided with a mounting plate 21, an auxiliary rod 25, a second main rod 26 and a compression spring 27, and applies elastic force to the impact rod 22 and the auxiliary rod 25 through the compression spring 27. The elastic force can be balanced with the friction force suffered by the impact rod 22, the friction force suffered by the auxiliary rod 25, the water pressure suffered by the impact rod 22, and the water pressure suffered by the auxiliary rod 25, so as to avoid the friction force and the water pressure from hindering the movement of the impact rod 22 as much as possible, and further avoid the negative influence of the friction force and the water pressure on the accuracy of the detection result as much as possible.

[0064] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A concrete strength testing device for municipal roads, characterized in that: It comprises a housing component (10), a detection component (20) and a sealing component, wherein the detection component (20) is connected to the housing component (10), and the sealing component is connected to the housing component (10); The housing assembly (10) comprises a cylinder (11), a first end cover (12) and a second end cover (13); the cylinder (11) is provided with a receiving cavity (111); two ends of the cylinder (11) are respectively provided with a first port (112) and a second port (113) which are in communication with the receiving cavity (111); the first end cover (12) is connected to one end of the cylinder (11) and blocks the first port (112); the second end cover (13) is connected to the other end of the cylinder (11) and blocks the second port (113); The detection component (20) comprises: A mounting plate (21) disposed in the accommodating cavity (111) and movable along the axial direction of the cylinder (11); A striking rod (22) is inserted through the first end cover (12) and is movable along the axial direction of the cylinder (11); A first main rod (23), one end of which is connected to the impact rod (22), and the other end of which is connected to the mounting plate (21); A hammer block (24) is movably sleeved on the first main rod (23), and the hammer block (24) is used to slide along the axial direction of the first main rod (23) to strike the impact rod (22), so that the impact rod (22) moves along the axial direction of the cylinder (11); an auxiliary rod (25) passing through the second end cover (13) and movable along the axial direction of the cylinder (11); A second main rod (26), one end of which is connected to the auxiliary rod (25) and the other end of which is connected to the mounting plate (21); A compression spring (27), one end of which abuts against the auxiliary rod (25) and the other end of which abuts against the second main rod (26); At least part of the structure of the sealing assembly is arranged on the first end cover (12) and is located between the first end cover (12) and the impact rod (22); at least part of the structure of the sealing assembly is arranged on the second end cover (13) and is located between the second end cover (13) and the auxiliary rod (25).

2. The concrete strength testing equipment for municipal roads according to claim 1 is characterized in that: The first end cover (12) is provided with a first clearance hole (121), and the second end cover (13) is provided with a second clearance hole (131); the sealing assembly comprises a first sealing ring and a second sealing ring; the first sealing ring is arranged on the inner side wall of the first clearance hole (121), the impact rod (22) is passed through the first clearance hole (121), and the first sealing ring is clamped by the impact rod (22) and the inner side wall of the first clearance hole (121); the second sealing ring is arranged on the inner side wall of the second clearance hole (131), the auxiliary rod (25) is passed through the second clearance hole (131), and the second sealing ring is clamped by the auxiliary rod (25) and the inner side wall of the second clearance hole (131).

3. The concrete strength testing equipment for municipal roads according to claim 1 is characterized in that: The auxiliary rod (25) comprises a first rod body (251) and a second rod body (252); the first rod body (251) is inserted into the second end cover (13), the second rod body (252) is arranged in the accommodating cavity (111), one end of the second rod body (252) is connected to the first rod body (251), and the diameter of the first rod body (251) is greater than the diameter of the second rod body (252); The second main rod (26) comprises a third rod body (261) and a fourth rod body (262); one end of the third rod body (261) is connected to the mounting plate (21), and the other end is connected to one end of the fourth rod body (262); the diameter of the third rod body (261) is larger than the diameter of the fourth rod body (262); an inserting hole (263) is provided on the end surface of the fourth rod body (262) away from the third rod body (261); the inserting hole (263) extends along the axial direction of the cylinder (11); at least part of the structure of the second rod body (252) is inserted into the inserting hole (263); and a discharge pipe (28) connected to the inserting hole (263) is provided on the fourth rod body (262); One end of the compression spring (27) abuts against the end surface of the first rod body (251) facing the second rod body (252), and the other end abuts against the end surface of the third rod body (261) facing the fourth rod body (262).

4. The concrete strength testing equipment for municipal roads according to claim 3 is characterized in that: The compression spring (27) is sleeved on the outer periphery of the fourth rod body (262) and is in close contact with the outer side wall of the fourth rod body (262).

5. The equipment for testing concrete strength in municipal roads according to claim 3 is characterized in that: At least a part of the structure of the second end cover (13) is threadedly inserted into the cylinder (11); the concrete strength testing device further comprises a driving assembly (30), the driving assembly (30) being connected between the discharge pipe (28) and the second end cover (13); when the second rod body (252) moves close to the third rod body (261), the driving assembly (30) is used to drive the second end cover (13) to rotate so as to move in a direction away from the first end cover (12), so as to keep the air pressure in the accommodating chamber (111) constant; when the second rod body (252) moves away from the third rod body (261), the driving assembly (30) is used to drive the second end cover (13) to rotate so as to move in a direction close to the first end cover (12), so as to keep the air pressure in the accommodating chamber (111) constant.

6. The concrete strength testing equipment for municipal roads according to claim 5 is characterized in that: The driving assembly (30) comprises: A telescopic oil cylinder (31) is arranged on the inner side wall of the accommodating chamber (111); the telescopic oil cylinder (31) comprises a cylinder sleeve (311) and a telescopic rod (312); the cylinder sleeve (311) is arranged on the inner side wall of the accommodating chamber (111) along the circumference of the cylinder (11), and a liquid inlet pipe (33) is provided on the cylinder sleeve (311); one end of the telescopic rod (312) is inserted into the cylinder sleeve (311), and the other end is located outside the cylinder sleeve (311); A connecting piece (32) connected to the portion of the second end cover (13) threadedly connected to the cylinder (11), and one end of the telescopic rod (312) away from the cylinder sleeve (311) is connected to the connecting piece (32); an infusion hose, one end of which is connected to the discharge pipe (28), and the other end of which is connected to the infusion pipe (33); The plug hole (263) is filled with oil; when the second rod body (252) moves close to the third rod body (261), the oil flows from the plug hole (263) through the infusion hose into the cylinder sleeve (311), so that the telescopic rod (312) extends from the cylinder sleeve (311) along the circumference of the cylinder (11), thereby causing the second end cover (13) to rotate away from the first end cover (12); when the second rod body (252) moves away from the third rod body (261), the oil flows from the cylinder sleeve (311) through the infusion hose into the plug hole (263), so that the telescopic rod (312) retracts into the cylinder sleeve (311) along the circumference of the cylinder (11), thereby causing the second end cover (13) to rotate close to the first end cover (12).

7. The concrete strength testing equipment for municipal roads according to any one of claims 1 to 6, characterized in that: The concrete strength testing device further comprises a guide and limit assembly, wherein the guide and limit assembly is arranged between the cylinder (11) and the mounting plate (21), and the guide and limit assembly is used to guide the mounting plate (21) to move only along the axial direction of the cylinder (11), and the guide and limit assembly is also used to prevent the mounting plate (21) from rotating.

8. The concrete strength testing equipment for municipal roads according to claim 7 is characterized in that: The guide limiter assembly comprises a guide limiter and a matching member; the guide limiter is arranged on the inner side wall of the accommodating cavity (111) along the axial direction of the cylinder (11), the matching member is arranged on the mounting plate (21), and the guide limiter and the matching member are arranged in an inlaid manner.

9. The equipment for testing concrete strength in municipal roads according to claim 8, characterized in that: One of the guide limit piece and the matching piece is a guide limit strip, and the other is a guide limit groove. At least a part of the structure of the guide limit strip is embedded in the guide limit groove.

10. The concrete strength testing equipment for municipal roads according to claim 7, characterized in that: The guide and limiter components are provided in a plurality of groups, and the plurality of guide and limiter components are arranged at intervals along the circumference of the cylinder (11).

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