A device for detecting the concrete strength of municipal roads

Abstract

The present invention relates to the technical field of detection equipment, and particularly relates to a detection equipment for detecting the concrete strength of municipal roads, which comprises a housing assembly, a detection assembly and a sealing assembly. The detection assembly is connected to the housing assembly, and the sealing assembly is connected to the housing assembly. The housing assembly includes a cylinder, a first end cover and a second end cover. The cylinder is provided with a receiving cavity, and a first port and a second port communicating with the receiving cavity are respectively provided at both ends of the cylinder. The first end cover is connected to one end of the cylinder and seals the first port, and the second end cover is connected to the other end of the cylinder and seals the second port. The detection assembly includes a mounting plate, a percussion rod, a first main rod, a hammering block, an auxiliary rod, a second main rod and a compression spring. The above-mentioned concrete strength detection equipment can eliminate the friction force received by the percussion rod and the auxiliary rod through the elastic force of the compression spring acting on the auxiliary rod and the second main rod, thereby improving the accuracy of the detection result of the equipment.

Description

Technical Field

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

[0002] A rebound hammer is a common detection device in the field of construction engineering and is used to test the compressive strength of concrete. The basic principle of the rebound hammer is as follows: a spring drives a heavy hammer, and the heavy hammer impacts a striker that is in perpendicular contact with the concrete surface with a constant kinetic energy, causing local deformation of the concrete and absorbing part of the energy. The other part of the energy is converted into the rebound kinetic energy of the heavy hammer. When the rebound kinetic energy is all 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 form of a rebound value (the ratio of the maximum rebound distance to the initial length of the spring).

[0003] An underwater rebound hammer is a rebound hammer applied in an underwater environment. To ensure the accuracy of the detection results, the underwater rebound hammer needs to be provided with a sealing structure between the end cap and the striker to prevent water from entering the interior of the rebound hammer. When the underwater rebound hammer is in use, a problem will be encountered: when the striker of the underwater rebound hammer moves, friction will be generated between the sealing structure and the striker, and at the same time, water will also exert pressure on the striker. Both the above-mentioned friction and the water pressure will affect the movement of the striker, resulting in inaccurate test results. To improve the accuracy of the detection results of the underwater rebound hammer, the above problem needs to be solved urgently. Summary of the Invention

[0004] Based on this, in view of the problem that the accuracy of the detection results of the current underwater rebound hammer is affected by water pressure and friction, it is necessary to provide a detection equipment for detecting the concrete strength of municipal roads.

[0005] The above object is achieved by the following technical solutions:

[0006] A device for detecting the strength of concrete in municipal road surveys, which includes a housing assembly, a detection assembly, and a sealing assembly. The detection assembly is connected to the housing assembly, and the sealing assembly is connected to the housing assembly; the housing assembly includes a cylinder, a first end cap, and a second end cap; 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 communicating with the receiving cavity. The first end cap is connected to one end of the cylinder and seals the first port, and the second end cap is connected to the other end of the cylinder and seals the second port; the detection assembly includes: a mounting plate arranged in the receiving cavity and movable along the axial direction of the cylinder; an impact rod passing through the first end cap and movable along the axial direction of the cylinder; a first main rod, one end connected to the impact rod and the other end connected to the mounting plate; a hammering block movably sleeved on the first main rod, and the hammering 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 passing through the second end cap and movable along the axial direction of the cylinder; a second main rod, one end connected to the auxiliary rod and the other end connected to the mounting plate; a compression spring, one end abuts against the auxiliary rod and the other end abuts against the second main rod; at least part of the structure of the sealing assembly is arranged on the first end cap and is located between the first end cap and the impact rod; at least part of the structure of the sealing assembly is arranged on the second end cap and is located between the second end cap and the auxiliary rod.

[0007] Further, the first end cap is provided with a first relief hole, and the second end cap is provided with a second relief 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 relief hole, the impact rod passes through the first relief hole, and the first sealing ring is clamped by the impact rod and the inner side wall of the first relief hole; the second sealing ring is arranged on the inner side wall of the second relief hole, the auxiliary rod passes through the second relief hole, and the second sealing ring is clamped by the auxiliary rod and the inner side wall of the second relief hole.

[0008] Further, the auxiliary rod includes a first rod body and a second rod body; the first rod body passes through the second end cap, the second rod body is arranged in the receiving cavity, one end of the second rod body is connected to the first rod body, and the diameter of the first rod body is greater than that 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 greater than that of the fourth rod body; a plug hole is provided on the end face of the fourth rod body away from the third rod body, the plug hole extends along the axial direction of the cylinder, at least part of the structure of the second rod body is inserted into the plug hole, and a discharge pipe communicating with the plug hole is provided on the fourth rod body; one end of the compression spring abuts against the end face of the first rod body facing the second rod body, and the other end abuts against the end face of the third rod body facing the fourth rod body.

[0009] Further, 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] Further, at least part of the structure of the second end cap is threadedly inserted into the cylinder; the concrete strength detection device further includes a driving assembly, and the driving assembly is connected between the discharge pipe and the second end cap; when the second rod moves closer to the third rod, the driving assembly is used to drive the second end cap to rotate and move away from the first end cap to keep the air pressure in the accommodation cavity constant; when the second rod moves away from the third rod, the driving assembly is used to drive the second end cap to rotate and move closer to the first end cap to keep the air pressure in the accommodation cavity constant.

[0011] Further, the driving assembly includes: a telescopic oil cylinder disposed on the inner side wall of the accommodation cavity; the telescopic oil cylinder includes an oil cylinder sleeve and a telescopic rod; the oil cylinder sleeve is disposed on the inner side wall of the accommodation cavity along the circumferential direction of the cylinder, and a liquid inlet pipe is provided on the oil cylinder sleeve; one end of the telescopic rod is inserted into the oil cylinder sleeve, and the other end is located outside the oil cylinder sleeve; a connecting member, the connecting member is connected to the part where the second end cap is threadedly connected to the cylinder, and the end of the telescopic rod away from the oil cylinder sleeve is connected to the connecting member; an infusion hose, one end of the infusion hose is communicated with the discharge pipe, and the other end is communicated with the liquid inlet pipe; the insertion hole is filled with oil; when the second rod moves closer to the third rod, the oil flows from the insertion hole through the infusion hose into the oil cylinder sleeve, so that the telescopic rod extends out of the oil cylinder sleeve along the circumferential direction of the cylinder, and further rotates the second end cap away from the first end cap; when the second rod moves away from the third rod, the oil flows from the oil cylinder sleeve through the infusion hose into the insertion hole, so that the telescopic rod retracts into the oil cylinder sleeve along the circumferential direction of the cylinder, and further rotates the second end cap closer to the first end cap.

[0012] Further, the concrete strength detection device further includes a guiding and limiting assembly, and the guiding and limiting assembly is disposed between the cylinder and the mounting plate. The guiding and limiting assembly is used to guide the mounting plate to move only along the axial direction of the cylinder, and the guiding and limiting assembly is further used to prevent the mounting plate from rotating.

[0013] Further, the guiding and limiting assembly includes a guiding and limiting member and a mating member; the guiding and limiting member is disposed on the inner side wall of the accommodation cavity along the axial direction of the cylinder, and the mating member is disposed on the mounting plate, and the guiding and limiting member and the mating member are fitted together.

[0014] Further, one of the guiding and limiting member and the mating member is a guiding and limiting strip, and the other is a guiding and limiting groove, and at least part of the structure of the guiding and limiting strip is embedded in the guiding and limiting groove.

[0015] Further, multiple groups of guiding and limiting assemblies are provided, and the multiple groups of guiding and limiting assemblies are arranged at intervals along the circumferential direction 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 1Schematic diagram of the structure of the concrete strength detection device for municipal road measurement shown from another perspective;

[0022] Figure 3 is Figure 2 Cross-sectional view of the structure shown in the A-A direction;

[0023] Figure 4 is Figure 2 Cross-sectional view of the structure shown in the B-B direction.

[0024] Wherein:

[0025] 100. Concrete strength detection device for municipal road measurement; 10. Housing assembly; 11. Cylinder; 111. Accommodation cavity; 112. First port; 113. Second port; 12. First end cap; 121. First relief hole; 13. Second end cap; 131. Second relief hole; 20. Detection assembly; 21. Mounting plate; 22. Impact rod; 23. First main rod; 24. Hammering 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. Insertion hole; 27. Compression spring; 28. Discharge pipe; 30. Driving assembly; 31. Telescopic oil cylinder; 311. Oil cylinder sleeve; 312. Telescopic rod; 32. Connecting piece; 33. Liquid inlet pipe. Detailed implementation manners

[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be 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 described objects and do not have any sequential or technical meanings. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, both include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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 defined and limited, the first feature being "on" or "under" the 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, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0029] Please refer to Figure 1 、 Figure 2 and Figure 3 As shown in, the present invention provides a device 100 for detecting the strength of concrete in municipal road surveys, which is used to detect the strength of concrete located underwater. The above-mentioned concrete strength detection device includes a housing assembly 10, a detection assembly 20 and a sealing assembly. The housing assembly 10 is the housing structure of the concrete strength detection device, and the housing assembly 10 is used to install and protect other components of the concrete strength detection device. The detection assembly 20 is used to detect the strength of the concrete, and the detection assembly 20 is connected to the housing assembly 10. The sealing assembly is the sealing structure of the concrete strength detection device, and the sealing assembly is connected to the housing assembly 10 to prevent external water from entering the housing assembly 10 and affecting the detection results of the concrete strength detection 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. At least part of the structure of the cylinder 11 is a cylindrical tubular structure, that is, the cylinder 11 has an axis. As a specific example, in the present embodiment, a part of the structure of the cylinder 11 is a cylindrical tubular structure, and another part of the cylinder 11 is a conical tubular structure. In some other embodiments, the cylinder 11 may be entirely a cylindrical tubular structure, and no limitation is made thereto. The cylinder 11 is provided with a receiving cavity 111, and a first port 112 and a second port 113 communicating with the receiving cavity 111 are respectively provided at both ends of the cylinder 11. The first end cap 12 is connected to one end of the cylinder 11 and seals the first port 112, and the second end cap 13 is connected to the other end of the cylinder 11 and seals the second port 113. Specifically, the first end cap 12 is connected to the end where the first port 112 of the cylinder 11 is located and seals the first port 112, and the second end cap 13 is connected to the end where the second port 113 of the cylinder 11 is located and seals the second port 113.

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

[0032] The mounting plate 21 is generally in a plate-like structure. The mounting plate 21 is disposed in the accommodation 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 generally in a round rod-like structure. The impact rod 22 passes through the first end cap 12 and can move along the axial direction of the cylinder 11. The impact rod 22 is used to impact the concrete to be detected under the strike of the hammering block 24, so as to complete the strength detection of the concrete.

[0034] The first main rod 23 is generally in a round rod-like 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. Wherein, the first main rod 23 and the impact rod 22 can be directly contact-connected, or can be indirectly connected through other intermediate members. The first main rod 23 and the mounting plate 21 can be directly contact-connected, or can be indirectly connected through other intermediate members, and this is not limited. As a specific example, in this embodiment, the first main rod 23 is coaxially arranged 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 hammering block 24 is in a block-like structure. The hammering block 24 is movably sleeved on the first main rod 23. The hammering 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, thereby completing the strength detection of the concrete.

[0036] The auxiliary rod 25 is generally in a round rod-like structure. The auxiliary rod 25 passes through the second end cap 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 generally in a round rod-like 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. Wherein, the second main rod 26 and the auxiliary rod 25 can be directly contact-connected (for example, the auxiliary rod 25 is slidably sleeved on one end of the second main rod 26), or can be indirectly connected through other intermediate members. The second main rod 26 and the mounting plate 21 can be directly contact-connected, or can be indirectly connected through other intermediate members, and this 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 accommodation 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 cap 12 and located between the first end cap 12 and the impact rod 22 to prevent water from seeping into the interior of the cylinder 11 through the gap between the first end cap 12 and the impact rod 22. At least part of the structure of the sealing assembly is disposed on the second end cap 13 and located between the second end cap 13 and the auxiliary rod 25 to prevent water from seeping into the interior of the cylinder 11 through the gap between the second end cap 13 and the auxiliary rod 25.

[0040] When the staff uses the above concrete strength testing equipment, they need to first perform a calibration operation and then a 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 limit position, remove the thrust applied to the auxiliary rod 25. At this time, the length of the compression spring 27 will elongate and push the auxiliary rod 25 in the direction away from the second main rod 26 until the length of the compression spring 27 finally stabilizes. After the length of the compression spring 27 stabilizes, the compression spring 27 is still in a compressed state. At this time, the compression spring 27 will provide an elastic force F1 to the auxiliary rod 25 and also provide an elastic force F2 to the impact rod 22 (since 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). The magnitudes of F1 and F2 are the same and the directions are opposite. The auxiliary rod 25 will also be subjected to the frictional 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 both are opposite to the direction of F1, and the three satisfy the magnitude relationship: F3 + F4 = F1. Similarly, in addition to the elastic force F2, the impact rod 22 will also be subjected to the frictional force F5 generated by the sealing assembly and the pressure F6 provided by the water. The directions of F5 and F6 are the same and both are opposite to the direction of F2, and the three satisfy the magnitude relationship: F5 + F6 = F2.

[0041] Through the above settings, after the calibration operation is completed, the compression spring 27, in cooperation with the auxiliary rod 25 and the second main rod 26, can minimize the influence of the frictional force and the water pressure on the impact rod 22, so that the impact rod 22 can move smoothly in the subsequent testing process and complete the concrete strength testing work, achieving the beneficial effect of improving the accuracy of the testing results of the concrete strength testing equipment. It should be noted that during the testing 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 move almost synchronously.

[0042] Please refer to Figure 3, in some embodiments, the first end cap 12 is provided with a first relief hole 121, and the second end cap 13 is provided with a second relief hole 131. The first relief hole 121 and the second relief hole 131 are both coaxially arranged with the cylinder 11. The sealing assembly includes a first sealing ring and a second sealing ring (both not shown in the figure). The first sealing ring is arranged on the inner side wall of the first relief hole 121. The impact rod 22 passes through the first relief hole 121, and the first sealing ring is clamped between the impact rod 22 and the inner side wall of the first relief hole 121. The second sealing ring is arranged on the inner side wall of the second relief hole 131. The auxiliary rod 25 passes through the second relief hole 131, and the second sealing ring is clamped between the auxiliary rod 25 and the inner side wall of the second relief hole 131.

[0043] Through the above arrangement, the impact rod 22 and the inner side wall of the first relief 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 through the gap between the impact rod 22 and the inner side wall of the first relief hole 121, thereby avoiding having a negative impact on the accuracy of the detection result. The auxiliary rod 25 and the inner side wall of the second relief 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 through the gap between the auxiliary rod 25 and the inner side wall of the second relief hole 131, thereby avoiding having 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 substantially circular rod-shaped structures and are coaxially arranged. The first rod body 251 passes through the second end cap 13, the second rod body 252 is arranged in the accommodation 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 substantially circular 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 face of the fourth rod body 262 away from the third rod body 261 is provided with a plugging hole 263, the plugging 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 plugging hole 263, and the fourth rod body 262 is provided with a discharge pipe 28 communicated with the plugging hole 263.

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

[0047] With the above settings, when the staff member pushes the auxiliary rod 25 towards 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 transmission of force, the compression spring 27 further generates an elastic force on the impact rod 22, so as to balance the frictional force and water pressure suffered by the impact rod 22 subsequently.

[0048] In some embodiments, the diameter of the first rod body 251 is equal to the diameter of the impact rod 22. With the above settings, since the impact rod 22 and the auxiliary rod 25 move almost 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 accommodation cavity 111 is almost fixed during the detection process, so as to ensure that the air pressure in the accommodation cavity 111 is basically maintained constant, and to minimize the influence of the air pressure change in the accommodation cavity 111 on the accuracy of the detection result.

[0049] In some embodiments, the compression spring 27 is sleeved on the outer periphery of the fourth rod body 262 and is in contact with the outer side wall of the fourth rod body 262. With the above settings, the fourth rod body 262 can play a guiding and limiting role on the compression spring 27, so that the compression spring 27 can stably expand and contract along the axial direction of the cylinder 11, so as to avoid the skew of the expansion and contraction direction of the compression spring 27, 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 detection device further includes a driving assembly 30, and the driving assembly 30 is connected between the discharge pipe 28 and the second end cap 13. When the second rod body 252 moves closer to the third rod body 261 (that is, during the calibration operation when the staff member pushes the auxiliary rod 25, and during this stage, the second rod body 252 is continuously inserted into the insertion hole 263), the driving assembly 30 is used to drive the second end cap 13 to rotate and move away from the first end cap 12, so as to keep the air pressure in the accommodation cavity 111 constant. When the second rod body 252 moves away from the third rod body 261 (that is, during the calibration operation when the staff member 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 removed from the insertion hole 263), the driving assembly 30 is used to drive the second end cap 13 to rotate and move closer to the first end cap 12, so as to keep the air pressure in the accommodation cavity 111 constant.

[0051] With the above settings, when the second rod body 252 moves closer to the third rod body 261, since the volume of the first rod body 251 entering the accommodation cavity 111 continuously increases, if the volume of the accommodation cavity 111 remains unchanged, it will cause the pressure of the gas in the accommodation cavity 111 to increase, thereby affecting the force-bearing condition of the impact rod 22 and further reducing the accuracy of the detection result. However, due to the provision of the driving assembly 30, when the second rod body 252 moves closer to the third rod body 261, the driving assembly 30 is used to drive the second end cover 13 to rotate and move in a direction away from the first end cover 12, so that the volume of the accommodation cavity 111 can be increased, thereby keeping the air pressure in the accommodation cavity 111 constant and improving the accuracy of the detection result. Similarly, when the second rod body 252 moves away from the third rod body 261, since the volume of the first rod body 251 located in the accommodation cavity 111 continuously decreases, if the volume of the accommodation cavity 111 remains unchanged, it will cause the pressure of the gas in the accommodation cavity 111 to decrease, thereby affecting the force-bearing condition of the impact rod 22 and further reducing the accuracy of the detection result. However, due to the provision of the driving assembly 30, 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 and move in a direction closer to the first end cover 12, so that the volume of the accommodation cavity 111 can be reduced, thereby keeping the air pressure in the accommodation cavity 111 constant and improving the accuracy of the detection result. It should be noted that in order to achieve the technical effect of keeping the air pressure in the accommodation cavity 111 constant, the detection device needs to be designed according to multiple structural parameters, and the above multiple structural parameters at least include: the diameter of the first rod body 251, the pitch of the second end cover 13, the rotation rate of the driving assembly 30 for driving the second end cover 13 to rotate, etc.

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

[0053] The telescopic oil cylinder 31 is disposed on the inner side wall of the accommodation cavity 111. The telescopic oil cylinder 31 includes an oil cylinder sleeve 311 and a telescopic rod 312. The oil cylinder sleeve 311 is generally a curved cylindrical structure, and the telescopic rod 312 is generally a curved round rod structure. The oil cylinder sleeve 311 is disposed on the inner side wall of the accommodation cavity 111 along the circumferential direction of the cylinder 11. The oil cylinder sleeve 311 is provided with a liquid inlet pipe 33. One end of the telescopic rod 312 is inserted into the oil cylinder sleeve 311, and the other end is located outside the oil cylinder sleeve 311.

[0054] The connecting member 32 is connected to the part where the second end cover 13 is 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 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 realize the indirect connection between the second end cover 13 and the telescopic rod 312.

[0055] One end of the infusion hose communicates with the discharge pipe 28, and the other end communicates with the liquid inlet pipe 33.

[0056] The insertion hole 263 is filled with oil. When the second rod body 252 moves closer to the third rod body 261 (i.e., during the calibration operation, the stage where the staff pushes the auxiliary rod 25, and during this stage, the second rod body 252 is continuously inserted into the insertion hole 263), the oil flows from the insertion hole 263 through the infusion hose into the cylinder sleeve 311, so that the telescopic rod 312 extends out of the cylinder sleeve 311 along the circumferential direction of the cylinder 11, and further rotates 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 stage where 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 removed from the insertion hole 263), the oil flows from the cylinder sleeve 311 through the infusion hose into the insertion hole 263, so that the telescopic rod 312 retracts into the cylinder sleeve 311 along the circumferential direction of the cylinder 11, and further rotates the second end cover 13 closer to the first end cover 12.

[0057] Through the above settings, when the second rod body 252 moves closer to the third rod body 261, the second rod body 252 is continuously inserted into the insertion hole 263, thereby squeezing the oil in the insertion hole 263 into the cylinder sleeve 311, so that the telescopic rod 312 extends out of the cylinder sleeve 311 along the circumferential direction of the cylinder 11. The elongation of the telescopic rod 312 will push the connecting member 32 to drive the second end cover 13 to rotate along the circumferential direction of the cylinder 11, so that the second end cover 13 rotates away from the first end cover 12 to increase the volume of the accommodation cavity 111, and further ensure the constancy of the air pressure in the accommodation cavity 111. When the second rod body 252 moves away from the third rod body 261, the second rod body 252 is continuously removed from the insertion hole 263. At this time, the oil will flow back from the cylinder sleeve 311 to the insertion hole 263, so that the telescopic rod 312 retracts into the cylinder sleeve 311 along the circumferential direction of the cylinder 11. The shortening of the telescopic rod 312 will drive the connecting member 32 and the second end cover 13 to rotate in the reverse direction along the circumferential direction of the cylinder 11, so that the second end cover 13 rotates closer to the first end cover 12 to reduce the volume of the accommodation cavity 111, and further ensure the constancy of the air pressure in the accommodation cavity 111.

[0058] In some embodiments, the concrete strength detection device further includes a guiding and limiting assembly (not shown in the figure). The guiding and limiting assembly is disposed between the cylinder 11 and the mounting plate 21. The guiding and limiting assembly is used to guide the mounting plate 21 to move only along the axial direction of the cylinder 11, and the guiding and limiting assembly is further used to prevent the mounting plate 21 from rotating, so as to improve the stability of the mounting plate 21 during movement.

[0059] In some embodiments, the guiding and limiting assembly includes a guiding and limiting member and a mating member (both not shown in the figure). The guiding and limiting member is disposed along the axial direction of the cylinder 11 on the inner side wall of the receiving cavity 111, and the mating member is disposed on the mounting plate 21. The guiding and limiting member and the mating member are fitted together. Through the above arrangement, the mounting plate 21 can only move along the extending direction of the guiding and limiting member (i.e., the axial direction of the cylinder 11), which can improve the stability of the movement of the mounting plate 21. Moreover, since the guiding and limiting member and the mating member are fitted together, the guiding and limiting member can further prevent the mounting plate 21 from rotating, thereby further improving the stability and reliability of the mounting plate 21 during movement, that is, improving the accuracy of the detection result of the concrete detection device.

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

[0061] In some other embodiments, the wire limiting member can also be a slide rail disposed along the axial direction of the cylinder 11 on the inner side wall of the receiving cavity 111, and the mating member can also be a slider disposed on the mounting plate 21, and the slider is embedded on the slide rail.

[0062] In some embodiments, multiple groups of guiding and limiting assemblies are provided, such as two groups, three groups, four groups, etc. The multiple groups of guiding and limiting assemblies are spaced apart along the circumferential direction 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 combined arbitrarily. 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 device for detecting the concrete strength of municipal roads, characterized in that, It includes a housing assembly (10), a detection assembly (20) and a sealing assembly. The detection assembly (20) is connected to the housing assembly (10), and the sealing assembly is connected to the housing assembly (10). The housing assembly (10) includes a cylinder (11), a first end cap (12) and a second end cap (13); the cylinder (11) is provided with a receiving cavity (111), and both ends of the cylinder (11) are respectively provided with a first port (112) and a second port (113) communicating with the receiving cavity (111). The first end cap (12) is connected to one end of the cylinder (11) and seals the first port (112), and the second end cap (13) is connected to the other end of the cylinder (11) and seals the second port (113). The detection assembly (20) includes: A mounting plate (21), which is arranged in the receiving cavity (111) and can move along the axial direction of the cylinder (11). An impact rod (22), which penetrates through the first end cap (12) and can move 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 is connected to the mounting plate (21). A hammering block (24), which is movably sleeved on the first main rod (23). The hammering 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). An auxiliary rod (25), which penetrates through the second end cap (13) and can move along the axial direction of the cylinder (11). A second main rod (26), the auxiliary rod (25) is slidably sleeved on one end of the second main rod (26), and the other end of the second main rod (26) 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 abuts against the second main rod (26). At least part of the structure of the sealing assembly is arranged on the first end cap (12) and is located between the first end cap (12) and the impact rod (22); at least part of the structure of the sealing assembly is arranged on the second end cap (13) and is located between the second end cap (13) and the auxiliary rod (25).

2. The concrete strength detection device for municipal road survey according to claim 1, characterized in that, The first end cap (12) is provided with a first relief hole (121), and the second end cap (13) is provided with a second relief hole (131); 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 relief hole (121), the impact rod (22) penetrates through the first relief hole (121), and the first sealing ring is clamped by the impact rod (22) and the inner side wall of the first relief hole (121); the second sealing ring is arranged on the inner side wall of the second relief hole (131), the auxiliary rod (25) penetrates through the second relief hole (131), and the second sealing ring is clamped by the auxiliary rod (25) and the inner side wall of the second relief hole (131).

3. The concrete strength detection device for municipal road survey according to claim 1, wherein, The auxiliary rod (25) includes a first rod body (251) and a second rod body (252); the first rod body (251) penetrates through the second end cover (13), the second rod body (252) is disposed in the accommodation 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) includes 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), the other end is connected to one end of the fourth rod body (262), and the diameter of the third rod body (261) is greater than the diameter of the fourth rod body (262); a socket hole (263) is provided on the end face of the fourth rod body (262) away from the third rod body (261), the socket hole (263) extends along the axial direction of the cylinder (11), at least a part of the second rod body (252) is inserted into the socket hole (263), and a discharge pipe (28) communicating with the socket hole (263) is provided on the fourth rod body (262). One end of the compression spring (27) abuts against the end face of the first rod body (251) facing the second rod body (252), and the other end abuts against the end face of the third rod body (261) facing the fourth rod body (262).

4. The concrete strength detection device for municipal road survey according to claim 3, characterized in that, The compression spring (27) is sleeved on the outer periphery of the fourth rod body (262) and is in contact with the outer side wall of the fourth rod body (262).

5. The concrete strength detection device for municipal road survey according to claim 3, characterized in that, At least a part of the second end cover (13) is threadedly inserted into the cylinder (11); the concrete strength detection device further includes a driving assembly (30), and the driving assembly (30) is connected between the discharge pipe (28) and the second end cover (13); when the second rod body (252) moves closer to the third rod body (261), the driving assembly (30) is used to drive the second end cover (13) to rotate and move in a direction away from the first end cover (12) so as to keep the air pressure in the accommodation cavity (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 and move in a direction close to the first end cover (12) so as to keep the air pressure in the accommodation cavity (111) constant. The driving assembly (30) includes: A telescopic oil cylinder (31) is disposed on the inner side wall of the accommodation cavity (111); the telescopic oil cylinder (31) includes an oil cylinder sleeve (311) and a telescopic rod (312); the oil cylinder sleeve (311) is disposed on the inner side wall of the accommodation cavity (111) along the circumferential direction of the cylinder (11), and a liquid inlet pipe (33) is provided on the oil cylinder sleeve (311); one end of the telescopic rod (312) is inserted into the oil cylinder sleeve (311), and the other end is located outside the oil cylinder sleeve (311). The connecting member (32) is connected to the portion where the second end cover (13) is 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 member (32); The infusion hose, one end of the infusion hose is communicated with the discharge pipe (28), and the other end is communicated with the liquid inlet pipe (33); The insertion hole (263) is filled with oil. When the second rod body (252) moves closer to the third rod body (261), the oil flows from the insertion hole (263) through the infusion hose into the cylinder sleeve (311), so that the telescopic rod (312) extends out of the cylinder sleeve (311) along the circumferential direction of the cylinder (11), and further rotates 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), the oil flows from the cylinder sleeve (311) through the infusion hose into the insertion hole (263), so that the telescopic rod (312) retracts into the cylinder sleeve (311) along the circumferential direction of the cylinder (11), and further rotates the second end cover (13) closer to the first end cover (12).

6. The concrete strength detection device for municipal road survey according to any one of claims 1 to 5, characterized in that, The concrete strength testing device further includes a guiding and limiting assembly, the guiding and limiting assembly is arranged between the cylinder (11) and the mounting plate (21), the guiding and limiting assembly is used to guide the mounting plate (21) to move only along the axial direction of the cylinder (11), and the guiding and limiting assembly is further used to prevent the mounting plate (21) from rotating.

7. The concrete strength detection device for municipal road survey according to claim 6, characterized in that, The guiding and limiting assembly includes a guiding and limiting member and a cooperating member; the guiding and limiting member is arranged along the axial direction of the cylinder (11) on the inner side wall of the accommodating cavity (111), the cooperating member is arranged on the mounting plate (21), and the guiding and limiting member is fitted with the cooperating member.

8. The concrete strength detection device for municipal road survey according to claim 7, characterized in that, One of the guiding and limiting member and the cooperating member is a guiding and limiting strip, and the other is a guiding and limiting groove, and at least part of the structure of the guiding and limiting strip is embedded in the guiding and limiting groove.

9. The concrete strength detection device for municipal road survey according to claim 6, characterized in that, A plurality of groups of the guiding and limiting assemblies are provided, and the plurality of groups of guiding and limiting assemblies are arranged at intervals along the circumferential direction of the cylinder (11).

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