Concrete electromagnetic penetration testing device

Abstract

The application discloses a kind of concrete electromagnetic penetration testing devices, including concrete medium;It further includes backing plate, backing plate is equipped with two, and is distributed in the both ends of concrete medium, and the bottom of backing plate is equipped with the moving assembly for backing plate movement, and backing plate surface is fixed with support plate;And electromagnetic wave transmitter and electromagnetic wave receiver, electromagnetic wave transmitter and electromagnetic wave receiver are distributed on two backing plates, and lifting mechanism is installed on two backing plates, the application is cooperated with the lifting mechanism and moving assembly designed to multiple position movement for electromagnetic wave transmitter and electromagnetic wave receiver, it is convenient to carry out electromagnetic penetration testing to each position of concrete medium, simultaneously, by the abutment of limiting piece and support plate inner locating hole, cooperate with the lifting of moving sleeve column, so as to be able to adjust the angle of electromagnetic wave transmitter and electromagnetic wave receiver, the detection of optimal receiving angle can be realized, so that the effect of electromagnetic penetration testing is better.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic penetration testing technology, and in particular to an electromagnetic penetration testing device for concrete. Background Technology

[0002] During the construction of concrete dams in hydropower stations, the hydration process of cement in the initial stage of concrete pouring releases a large amount of heat of hydration. Due to the high thermal resistance of concrete and the different heat dissipation conditions between the interior and surface, heat accumulates internally and is difficult to dissipate, causing the internal temperature of the concrete to rise. Meanwhile, the surface dissipates heat more quickly, creating a temperature difference between the interior and surface of the concrete (or a basic temperature difference between new and old concrete), thus generating thermal stress on the concrete surface. Once the surface tensile stress exceeds the instantaneous tensile strength of the concrete, thermal cracks will appear on the concrete surface. Thermal stress is directly proportional to the temperature difference; the greater the temperature difference between the inside and outside of the concrete structure within a certain range, the greater the thermal stress, and therefore the greater the risk of cracking. This can lead to cracks in the dam, weakening the stability of the dam structure. Therefore, reasonable temperature monitoring and control are key factors in ensuring the quality of dam construction.

[0003] Currently, the Pulse passive wireless concrete temperature monitoring system measures changes in the resonant frequency of electromagnetic waves to obtain changes in capacitance, and then calculates the internal temperature change of the concrete block to obtain the current internal temperature value. However, concrete is a lossy medium, and electromagnetic waves of different frequencies experience varying losses during propagation. To wirelessly measure the temperature of concrete during solidification, it is first necessary to measure the electromagnetic parameters of the concrete. Common concrete electromagnetic parameter testing typically consists of an electromagnetic wave transmitter, an electromagnetic wave receiver, and the concrete medium. The transmitter generates electromagnetic waves, which are received by the receiver after passing through the concrete medium to detect the transmission parameters. However, to ensure more accurate test results, multiple tests are required, and the angles between the transmitter and receiver need to be tested at multiple angles to determine the optimal receiving range. Therefore, personnel need to adjust the equipment position multiple times. When the concrete medium is wide, it is difficult to ensure synchronous adjustment. Therefore, a concrete electromagnetic penetration testing device needs to be designed to solve this problem. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] Given that the existing technology involves a cumbersome process for multi-point detection and adjustment of electromagnetic waves, and that asynchronous adjustment can easily lead to errors in electromagnetic wave transmission and reception, this invention is proposed.

[0006] Therefore, the purpose of this invention is to provide a concrete electromagnetic penetration testing device that allows for convenient adjustment of the positions of the electromagnetic wave transmitter and receiver, facilitating the transmission and reception of electromagnetic waves.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a concrete electromagnetic penetration testing device, comprising a concrete medium; further comprising two pads distributed at both ends of the concrete medium, a moving component for moving the pads being installed at the bottom of the pads, and a support plate being fixed to the surface of the pads; an electromagnetic wave transmitter and an electromagnetic wave receiver distributed on the two pads, and a lifting mechanism being installed on both pads, which drives the electromagnetic wave transmitter and the electromagnetic wave receiver to be raised and lowered; and a positioning component fixed to the top of the support plate, the positioning component being used to position the two pads.

[0008] In a preferred embodiment of the electromagnetic penetration testing device for concrete according to the present invention, the lifting mechanism includes a drive motor fixed to the pad, a lifting screw fixed to the output end of the drive motor via a coupling, and the top of the lifting screw fixed to the outer side of the support plate via a bearing seat. A movable sleeve is threaded onto the outer side of the lifting screw, and a mounting seat is slidably fitted onto the outer side of the movable sleeve. A loading component is mounted on one end of the mounting seat, and the loading component is aligned with the outer end of the movable sleeve. An installation groove is formed within the mounting seat, and a limiting component is installed within the installation groove to limit the relative contact between the mounting seat and the movable sleeve.

[0009] In a preferred embodiment of the concrete electromagnetic penetration testing device of the present invention, the loading component includes a loading frame, and the loading frames in the two loading components are respectively used for the installation of the electromagnetic wave transmitter and the electromagnetic wave receiver. The outer end of the loading frame is provided with two docking frames. Both ends of the mounting base are fixed with mounting plates, and the adjacent sides of the two mounting plates are fixed with docking columns that are inserted into the docking frames. The outer end of the loading frame is fixed with a docking plate, and the outer end of the docking plate is rotatably docked with an adjusting plate via a rotating shaft. The adjusting plate is fixed to the outside of the movable sleeve column.

[0010] In a preferred embodiment of the electromagnetic penetration testing device for concrete according to the present invention, a threaded rod is threadedly inserted into the outer side of the loading frame, and a rotating cap is fixed to the top of the threaded rod, with a rubber sleeve fitted at the end of the threaded rod away from the rotating cap.

[0011] In a preferred embodiment of the electromagnetic penetration testing device for concrete according to the present invention, the limiting component includes an electric push rod and a limiting rod. A support block is fixed in the mounting groove, and the limiting rod slides through the support block. An insertion hole is opened on the outer side of the movable sleeve column, and at least one positioning hole is opened at equal intervals on the outer side of the support plate. The electric push rod is fixed on the mounting base, and its output end is fixed to the limiting rod through a connecting block. Both ends of the limiting rod are slidably inserted into the mounting base, and both ends are respectively adapted to the positioning hole and the insertion hole.

[0012] In a preferred embodiment of the electromagnetic penetration testing device for concrete according to the present invention, the movable sleeve column has at least one planar structure on its outer side, and the movable sleeve column is slidably inserted into the outer side of the mounting base. A guide frame is fixed on the outer side of the mounting base, and the guide frame is slidably sleeved on the outer side of the movable sleeve column. The electric push rod is fixed on the outer side of the guide frame.

[0013] In a preferred embodiment of the electromagnetic penetration testing device for concrete according to the present invention, two track plates are fixed on the outer side of the support plate, and the track plates are slidably attached to the outer side of the mounting base.

[0014] In a preferred embodiment of the electromagnetic penetration testing device for concrete according to the present invention, the movable component includes a movable screw threadedly inserted into the bottom of the pad, two pads are rotatably mounted at both ends of the movable screw via bearings, and a slide rod inserted into the pad is fixed between the two pads. A movable motor is fixed on one of the pads, and the output end of the movable motor is fixed to the outer end of the movable screw via a coupling.

[0015] In a preferred embodiment of the electromagnetic penetration testing device for concrete according to the present invention, the concrete medium includes a placement frame and at least one concrete block, wherein the at least one concrete block is bonded to each other with cement and placed inside the placement frame.

[0016] In a preferred embodiment of the electromagnetic penetration testing device for concrete according to the present invention, the positioning component includes an infrared transmitter and an infrared receiver, the infrared transmitter and the infrared receiver are respectively fixed on the outside of the bearing seats on the top of the two support plates, and the height of the support plates is higher than that of the concrete medium.

[0017] The beneficial effects of this invention are as follows: This invention achieves multi-position movement of the electromagnetic wave transmitter and receiver by means of the designed lifting mechanism and moving components working together, which facilitates electromagnetic penetration testing at various locations in the concrete medium. At the same time, by connecting the limiting component with the positioning hole in the support plate and cooperating with the lifting of the moving sleeve column, the angle of the electromagnetic wave transmitter and receiver can be adjusted to achieve the detection of the optimal receiving angle, resulting in better electromagnetic penetration testing.

[0018] In this solution, the positioning component can locate the two pads, enabling the moving component to assist in positioning when the test piece is placed, and ensuring synchronous movement during the testing process. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0020] Figure 1 This is a schematic diagram of the overall structure of a concrete electromagnetic penetration testing device according to one embodiment of the present invention.

[0021] Figure 2 This is a partial cross-sectional side view of a concrete electromagnetic penetration testing device according to an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the pad, support plate, and external components of a concrete electromagnetic penetration testing device according to an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of the lifting mechanism of a concrete electromagnetic penetration testing device according to one embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of the mounting base and loading components of a concrete electromagnetic penetration testing device according to one embodiment of the present invention.

[0025] Figure 6 This is a schematic diagram of the mounting base and limiting component of a concrete electromagnetic penetration testing device according to one embodiment of the present invention.

[0026] Figure 7 This is a schematic diagram illustrating the separation of the movable sleeve column from the mounting base of a concrete electromagnetic penetration testing device according to an embodiment of the present invention.

[0027] Figure 8 This is a schematic diagram showing the loading frame of a concrete electromagnetic penetration testing device at at least one angle, as provided in one embodiment of the present invention. Detailed Implementation

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0031] Example 1

[0032] Reference Figures 1-4 This is the first embodiment of the present invention. This embodiment provides a concrete electromagnetic penetration testing device, which uses a designed lifting mechanism 200 and a moving component 102 to work together to achieve synchronous movement and adjustment of the electromagnetic wave transmitter 104 and the electromagnetic wave receiver 105, making adjustment more convenient and accurate during multi-point testing.

[0033] Specifically, it includes a concrete medium 100; it also includes two pads 101, which are distributed at both ends of the concrete medium 100. A moving component 102 for moving the pad 101 is installed at the bottom of the pad 101, and a support plate 103 is fixed on the surface of the pad 101; an electromagnetic wave transmitter 104 and an electromagnetic wave receiver 105, which are distributed on the two pads 101, and a lifting mechanism 200 is installed on each of the two pads 101. The lifting mechanism 200 drives the electromagnetic wave transmitter 104 and the electromagnetic wave receiver 105 to be raised and lowered; and a positioning component 300 fixed on the top of the support plate 103, which is used to position the two pads 101.

[0034] It should be noted that in this scheme, concrete medium 100 is first prepared according to the width of the dam and the materials to be prepared. Then, two pads 101 and a moving component 102 are placed at both ends of the concrete medium 100. After that, the electromagnetic wave transmitter 104 and the electromagnetic wave receiver 105 are used to perform penetration tests on the concrete medium 100. By cooperating with the moving component 102 and the lifting mechanism 200 to adjust the corresponding positions of the electromagnetic wave transmitter 104 and the electromagnetic wave receiver 105, multi-point detection is performed.

[0035] It should be noted that: (referring to...) Figures 3-5 The lifting mechanism 200 includes a drive motor 201 fixed on a pad 101. The output end of the drive motor 201 is fixed to a lifting screw 202 via a coupling. The top of the lifting screw 202 is fixed to the outside of the support plate 103 via a bearing seat 203. A movable sleeve 204 is threaded onto the outside of the lifting screw 202. A mounting seat 205 is slidably fitted onto the outside of the movable sleeve 204. A loading member 206 is installed at one end of the mounting seat 205. The loading member 206 is connected to the outer end of the movable sleeve 204. A mounting groove 207 is opened in the mounting seat 205. A limiting member 208 for limiting the relative connection between the mounting seat 205 and the movable sleeve 204 is installed in the mounting groove 207.

[0036] The lifting mechanism 200 achieves lifting as follows: First, the lifting screw 202 is driven to rotate by the drive motor 201, which causes the movable sleeve 204 connected to its outer thread to move up and down. Under the action of the limiter 208, the mounting base 205 is driven to follow the lifting, thereby driving the electromagnetic wave transmitter 104 and electromagnetic wave receiver 105 in the loading component 206 to perform corresponding lifting and adjustment.

[0037] In this plan, refer to Figures 5-7 The loading component 206 includes a loading frame 206a, and the loading frames 206a in the two loading components 206 are respectively used for the installation of the electromagnetic wave transmitter 104 and the electromagnetic wave receiver 105. The outer end of the loading frame 206a is provided with two docking frames 206b. The two ends of the mounting base 205 are fixed with mounting plates 206c, and the adjacent sides of the two mounting plates 206c are fixed with docking posts 206d that are inserted into the docking frames 206b. The outer end of the loading frame 206a is fixed with a docking plate 206e, and the outer end of the docking plate 206e is rotatably docked with an adjusting plate 206f through a rotating shaft. The adjusting plate 206f is fixed on the outside of the movable sleeve post 204.

[0038] At the same time, refer to Figure 6 and Figure 7The limiting component 208 includes an electric push rod 208a and a limiting rod 208b. A support block 208c is fixed in the mounting groove 207, and the limiting rod 208b slides through the support block 208c. An insertion hole 208d is opened on the outer side of the movable sleeve column 204, and at least one positioning hole 208e is opened at equal intervals on the outer side of the support plate 103. The electric push rod 208a is fixed on the mounting base 205, and its output end is fixed to the limiting rod 208b through a connecting block. Both ends of the limiting rod 208b are slidably inserted into the mounting base 205, and both ends are adapted to the positioning hole 208e and the insertion hole 208d, respectively.

[0039] The principle of adjusting the angle of the electromagnetic wave transmitter 104 and the electromagnetic wave receiver 105 is as follows: First, after the lifting mechanism 200 moves to the specified height, the electric push rod 208a drives the limiting rod 208b to move, causing the limiting rod 208b to disengage from the insertion hole 208d on the movable sleeve 204 and engage with the positioning hole 208e on the support plate 103, thus limiting the distance between the mounting base 205 and the support plate 103. Then, the continued rotation of the lifting screw 202 causes the movable sleeve 204 to move up and down. The mounting base 205 is limited by the limiting member 208 inserted into the support plate 103 and cannot move with the movable sleeve 204. However, the lifting of the movable sleeve 204 will cause the adjusting plate 206f to rise and fall synchronously, thus pulling the docking plate 206e and the loading frame 206a accordingly, causing one end of the loading frame 206a to be pulled and tilted. Figure 8 As shown, the angles of the electromagnetic wave transmitter 104 and the electromagnetic wave receiver 105 can be adjusted so that the angles can be adjusted during multi-point electromagnetic penetration testing to detect the optimal receiving and transmitting angles.

[0040] After the angle adjustment is completed, the movable sleeve 204 is first moved to the initial position, and then the limit rod 208b is pushed into the insertion hole 208d in the movable sleeve 204 by the electric push rod 208a. At the same time, it disengages from the positioning hole 208e on the support plate 103, thereby fixing the mounting base 205 and the movable sleeve 204, so that the mounting base 205 can follow the movable sleeve 204 to move up and down accordingly.

[0041] Among them, reference Figure 6 In order to improve the loading stability of electromagnetic wave transmitter 104 and electromagnetic wave receiver 105, a threaded rod 206a-1 is threaded into the outside of the loading frame 206a, and a rotating cap 206a-2 is fixed on the top of the threaded rod 206a-1. A rubber sleeve is fitted on the end of the threaded rod 206a-1 away from the rotating cap 206a-2.

[0042] At the same time, refer to Figure 3The moving component 102 includes a moving screw 102a that is threaded into the bottom of the pad 101. Two pads 102b are rotatably mounted at both ends of the moving screw 102a via bearings. A slide rod 102c that is inserted into the pad 101 is fixed between the two pads 102b. A moving motor 102d is fixed on one of the pads 102b, and the output end of the moving motor 102d is fixed to the outer end of the moving screw 102a via a coupling.

[0043] It should be noted that the rotation of the moving motor 102d drives the moving lead screw 102a to rotate, thereby causing the pad 101 to move accordingly on the slide rod 102c, thus satisfying the horizontal movement adjustment of the electromagnetic wave transmitter 104 and the electromagnetic wave receiver 105 on the pad 101.

[0044] It should also be noted that the concrete medium 100 in this scheme includes a placement frame 106 and at least one concrete block 107. The concrete blocks 107 are bonded together with cement and placed in the placement frame 106. The preparation of multiple concrete blocks 107 is simple, and after being bonded with cement, it is convenient to adjust their width. At the same time, it meets the same width and material requirements as the dam, which can reduce the testing cost to a certain extent.

[0045] Example 2

[0046] Reference Figure 5 and Figure 7 This is the second embodiment of the present invention. This embodiment provides a supplementary description of the first embodiment, and its difference from the first embodiment is the enhancement of the moving stability of the movable sleeve 204.

[0047] Specifically, the movable sleeve 204 has at least one planar structure on its outer side, and the movable sleeve 204 is slidably inserted into the outer side of the mounting base 205. A guide frame 205a is fixed on the outer side of the mounting base 205, and the guide frame 205a is slidably sleeved on the outer side of the movable sleeve 204. The electric push rod 208a is fixed on the outer side of the guide frame 205a.

[0048] Meanwhile, two track plates 103a are fixed to the outer side of the support plate 103, and the track plates 103a slide against the outer side of the mounting base 205.

[0049] The principle that enables the movable sleeve 204 to move stably: (Refer to...) Figure 7 The shape of the movable sleeve 204 is optimized, and at least one flat surface is designed so that after the mounting base 205 is fixed, the continued rotation of the movable screw 102a can make the movable sleeve 204 move more stably. The guide frame 205a is designed to increase the contact area between the mounting base 205 and the movable sleeve 204, and also makes the movement and adjustment between the mounting base 205 and the movable sleeve 204 more stable.

[0050] It should also be noted that the track plate 103a, designed in conjunction with the design, improves the stability of the lifting of the mounting base 205.

[0051] Example 3

[0052] Reference Figures 1-4 This is the third embodiment of the present invention. This embodiment provides supplementary explanations to the other embodiments. What makes it different from the other embodiments is that the positioning member 300 is implemented in a specific way.

[0053] Specifically, the positioning component 300 includes an infrared transmitter 301 and an infrared receiver 302. The infrared transmitter 301 and the infrared receiver 302 are respectively fixed on the outside of the bearing seats 203 at the top of the two support plates 103. The height of the support plates 103 is higher than that of the concrete medium 100.

[0054] It should be noted that the infrared transmitter 301 is designed to emit infrared rays, and the infrared receiver 302 is designed to receive the emitted infrared rays. By determining whether the infrared rays are received, it is possible to determine whether the two pads 101 are in the same relative position, thereby completing the positioning operation between the two pads 101.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A concrete electromagnetic penetration testing device, characterized in that: include, The concrete medium (100) includes a pad (101), two pads (101) are provided and distributed at both ends of the concrete medium (100), a moving component (102) for moving the pad (101) is installed at the bottom of the pad (101), and a support plate (103) is fixed on the surface of the pad (101). An electromagnetic wave transmitter (104) and an electromagnetic wave receiver (105) are provided. The electromagnetic wave transmitter (104) and the electromagnetic wave receiver (105) are distributed on two pads (101). A lifting mechanism (200) is installed on each of the two pads (101). The electromagnetic wave transmitter (104) and the electromagnetic wave receiver (105) are adjusted by lifting through the lifting mechanism (200). The lifting mechanism (200) includes a drive motor (201) fixed on the pad (101). The output end of the drive motor (201) is fixed with a lifting screw (202) via a coupling. The top of the lifting screw (202) is fixed to the outside of the support plate (103) via a bearing seat (203). A movable sleeve (204) is threaded onto the outside of the lifting screw (202). A mounting seat (205) is slidably fitted onto the outside of the movable sleeve (204). A loading member (206) is installed at one end of the mounting seat (205). The loading member (206) is connected to the outer end of the movable sleeve (204). A mounting groove (207) is opened in the mounting seat (205). A limiting member (208) for limiting the relative connection between the mounting seat (205) and the movable sleeve (204) is installed in the mounting groove (207). The loading component (206) includes a loading frame (206a), and the loading frames (206a) in the two loading components (206) are respectively used for the installation of the electromagnetic wave transmitter (104) and the electromagnetic wave receiver (105). The outer end of the loading frame (206a) is provided with two docking frames (206b). Both ends of the mounting base (205) are fixed with mounting plates (206c), and the adjacent sides of the two mounting plates (206c) are fixed with docking posts (206d) that are inserted into the docking frames (206b). The outer end of the loading frame (206a) is fixed with a docking plate (206e), and the outer end of the docking plate (206e) is rotatably docked with an adjusting plate (206f) through a rotating shaft. The adjusting plate (206f) is fixed to the outside of the movable sleeve (204). The limiting component (208) includes an electric push rod (208a) and a limiting rod (208b). A support block (208c) is fixed in the mounting groove (207), and the limiting rod (208b) slides through the support block (208c). An insertion hole (208d) is opened on the outer side of the movable sleeve (204), and at least one positioning hole (208e) is opened at equal intervals on the outer side of the support plate (103). The electric push rod (208a) is fixed on the mounting base (205), and its output end is fixed to the limiting rod (208b) through a connecting block. Both ends of the limiting rod (208b) are slidably inserted into the mounting base (205), and both ends are adapted to the positioning hole (208e) and the insertion hole (208d) respectively. And a positioning element (300) fixed to the top of the support plate (103), the positioning element (300) being used to position the two pads (101); The positioning component (300) includes an infrared transmitter (301) and an infrared receiver (302), which are respectively fixed on the outside of the bearing seat (203) on the top of the two support plates (103), and the height of the support plate (103) is higher than that of the concrete medium (100).

2. The electromagnetic penetration testing device for concrete as described in claim 1, characterized in that: The loading frame (206a) has a threaded rod (206a-1) threaded into its outer side, and a rotating cap (206a-2) is fixed to the top of the threaded rod (206a-1). A rubber sleeve is fitted on the end of the threaded rod (206a-1) away from the rotating cap (206a-2).

3. The electromagnetic penetration testing device for concrete as described in claim 2, characterized in that: The movable sleeve (204) has at least one planar structure on its outer side, and the movable sleeve (204) is slidably inserted into the outer side of the mounting base (205). A guide frame (205a) is fixed on the outer side of the mounting base (205), and the guide frame (205a) is slidably sleeved on the outer side of the movable sleeve (204). The electric push rod (208a) is fixed on the outer side of the guide frame (205a).

4. The electromagnetic penetration testing device for concrete as described in claim 3, characterized in that: Two track plates (103a) are fixed to the outer side of the support plate (103), and the track plates (103a) slide against the outer side of the mounting base (205).

5. The electromagnetic penetration testing device for concrete as described in claim 2, characterized in that: The moving assembly (102) includes a moving screw (102a) that is threaded into the bottom of the pad (101). Two pads (102b) are rotatably mounted on both ends of the moving screw (102a) via bearings. A slide rod (102c) that is inserted into the pad (101) is fixed between the two pads (102b). A moving motor (102d) is fixed on one of the pads (102b), and the output end of the moving motor (102d) is fixed to the outer end of the moving screw (102a) via a coupling.

6. The electromagnetic penetration testing device for concrete as described in claim 5, characterized in that: The concrete medium (100) includes a placement frame (106) and at least one concrete block (107), the concrete blocks (107) being bonded together with cement and placed inside the placement frame (106).

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