Concrete penetration resistance meter

Abstract

The utility model discloses a concrete penetration resistance meter which comprises a base, a moving mechanism, a placing table, a test mold, a supporting rod, a mounting frame, a control assembly and a penetration needle assembly, the penetration needle assembly comprises a mounting sleeve, the mounting sleeve is mounted on the control assembly, and the bottom of the mounting sleeve is open; the connecting sleeve is mounted in the mounting sleeve, internal threads are formed in the inner wall of the connecting sleeve, two limiting blocks are arranged on the outer wall of the connecting sleeve, two limiting grooves which are in sliding connection with the limiting blocks are axially formed in the inner wall of the mounting sleeve, and the bottom of the connecting sleeve is open; a first stud is arranged at the top of the needle body, the needle body is in threaded connection with the connecting sleeve through the first stud, and a first nut is fixedly arranged on the first stud; the pressure sensor is installed at the top of the interior of the installation sleeve, and when the connection sleeve moves upwards in the installation sleeve, the top of the connection sleeve abuts against the pressure sensor.

Description

Technical Field

[0001] This utility model relates to the field of concrete testing technology, and in particular to a concrete penetration resistance meter. Background Technology

[0002] The concrete penetration resistance meter, also known as the concrete penetration meter or setting time meter, is a precision testing instrument specifically used to determine the penetration resistance of fresh concrete (mainly mortar components), thereby determining its initial and final setting times.

[0003] In existing technologies, such as the concrete penetration resistance meter disclosed in CN 220603470 U, a first motor drives a fixed column and a penetration needle to move, allowing the penetration needle to enter the concrete for testing. The penetration depth can be determined by a measuring line, ensuring that the penetration depth is consistent each time. The first motor drives a moving stage and a placement cylinder to move, allowing adjustment of the concrete position to be tested, facilitating testing of concrete at other locations. The angle of the penetration needle can be adjusted by rotating a second support rod, further facilitating testing of concrete at different locations. This achieves the purpose of ensuring consistent penetration depth of the penetration needle and facilitating testing of concrete at different angles. The structure is simple and convenient for testing.

[0004] However, it also has some shortcomings. For example, when testing concrete, it is necessary to select a penetration needle of different diameters according to the current hardness of the concrete. In the above-mentioned prior art, the penetration needle is fixedly connected to the fixed seat, so it is inconvenient to replace the penetration needle when it is necessary to replace it with a different diameter. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a concrete penetration resistance meter that facilitates the replacement of the penetration needle.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a concrete penetration resistance meter, including a base, a moving mechanism provided in the base, a placement platform for placing a test mold provided on the moving mechanism, a support rod provided on the base, a mounting frame provided on the support rod, a control component for controlling the penetration of a penetration needle into the concrete provided on the mounting frame, a penetration needle assembly provided on the control component, the penetration needle assembly including a mounting sleeve, the mounting sleeve being installed on the control component, the bottom of the mounting sleeve being open; and a connecting sleeve, the connecting sleeve being installed on the mounting sleeve. In the assembly, the inner wall of the connecting sleeve is provided with an internal thread, the outer wall of the connecting sleeve is provided with not less than two limiting blocks, the inner wall of the mounting sleeve is provided with not less than two limiting grooves that slide in connection with the limiting blocks, and the bottom of the connecting sleeve is open; the needle body is provided with a first stud at its top, and the needle body is screwed to the connecting sleeve through the first stud, and a first nut is fixedly provided on the first stud; the pressure sensor is installed at the top of the mounting sleeve, and when the connecting sleeve moves upward in the mounting sleeve, the top of the connecting sleeve abuts against the pressure sensor.

[0007] A further preferred embodiment of this utility model is as follows: the control component includes a first telescopic device, which is mounted on a mounting frame and has its telescopic end facing the base; a connecting plate, which is mounted on the telescopic end of the first telescopic device and the mounting sleeve is connected to the bottom of the connecting plate; and telescopic rods, which include at least two rods, both of which are mounted on the mounting frame and are located on the left and right sides of the first telescopic device, with their telescopic ends connected to the top of the connecting plate.

[0008] A further preferred embodiment of this utility model is as follows: a clamping assembly is provided on the placement platform, the clamping assembly includes a mounting plate, two mounting plates are provided, the two mounting plates are symmetrically installed on the left and right ends of the placement platform, and two second telescopic devices are horizontally provided on each adjacent side wall of the mounting plate; clamping blocks, two clamping blocks are provided, the two clamping blocks are symmetrically arranged on the telescopic ends of the second telescopic devices.

[0009] A further preferred embodiment of this utility model is as follows: the test mold includes a first mold body, which is placed on a placement platform and has an opening at its top; a second mold body, which is installed on top of the first mold body and also has an opening at its top; and a filter cylinder, which is installed at the bottom of the second mold body and has its bottom inserted into the first mold body.

[0010] A further preferred embodiment of this utility model is as follows: The base has at least four adjusting seats at its bottom, each adjusting seat including a support sleeve. The top of the support sleeve is connected to the bottom of the base, and the bottom of the support sleeve is open. An internal thread is formed on the inner wall of the support sleeve. A second stud is installed in the support sleeve and screwed to it, with its bottom protruding from the support sleeve. A support block has a mounting groove at its top, in which a bearing is installed. The outer ring of the bearing is fixedly connected to the side wall of the mounting groove, and the inner ring of the bearing is fixedly connected to the outer wall of the second stud. A second nut is fixedly installed at the bottom of the second stud, and is located above the support block.

[0011] A further preferred embodiment of this utility model is that the support rod and the base are detachably connected by bolts.

[0012] A further preferred embodiment of this utility model is as follows: the mounting bracket includes a sliding sleeve that is slidably sleeved with the support rod. The sliding sleeve has a horizontal plate on one side wall near the test mold. The control component is mounted on the horizontal plate. Two knobs for locking are provided on the outer wall of the sliding sleeve. The bottom of the knob passes through the sliding sleeve and abuts against the outer wall of the support rod. The knob is screwed to the sliding sleeve.

[0013] A further preferred embodiment of this utility model is: a through hole communicating with the interior of the mounting sleeve is provided on the sleeve wall, and a conduit communicating with the through hole is provided on the outer wall of the mounting sleeve.

[0014] A further preferred embodiment of this utility model is: a connecting ring is provided on the top of the first mold body, and a connecting groove for accommodating the connecting ring is provided on the bottom of the second mold body.

[0015] A further preferred embodiment of this utility model is as follows: at least two sliding grooves are axially formed on the support rod, and a slider matching the two sliding grooves is provided on the inner wall of the sliding sleeve, and the side wall of the support rod that abuts against the knob is flat.

[0016] Compared with the prior art, the advantages of this utility model are that when replacing the penetration needle, the operator can use an open-end wrench to wrench the first nut, and then turn the open-end wrench to unscrew the first stud from the connecting sleeve, so that the needle body and the first stud can be removed together. When installing the penetration needle, the first stud is screwed into the connecting sleeve, and the operator can use an open-end wrench to turn the first nut to make the first stud and the connecting sleeve firmly connected. This makes it convenient to replace the penetration needle, and also makes it convenient for the concrete penetration resistance meter to replace penetration needles of different diameters when testing concrete of different hardness. Attached Figure Description

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 This is a front view of the present invention;

[0019] Figure 2 This is a side view of the present invention;

[0020] Figure 3 This is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 4 This is a three-dimensional isometric structural diagram of the present invention.

[0022] Figure 5 This is a three-dimensional structural diagram of the clamping component in this utility model when clamping the test mold;

[0023] Figure 6 This is a three-dimensional exploded view of the pilot-scale model of this utility model;

[0024] Figure 7 This is a schematic diagram of the pilot-scale mold of this utility model;

[0025] Figure 8 This is a three-dimensional schematic diagram of the insertion needle assembly in this utility model;

[0026] Figure 9 This is a schematic diagram of the structure of the penetration needle assembly in this utility model;

[0027] Figure 10 This is a schematic diagram of the mounting sleeve in this utility model;

[0028] Figure 11 This is a three-dimensional structural diagram of the adjusting seat in this utility model;

[0029] Figure 12 This is a schematic diagram of the structure of the adjusting seat in this utility model.

[0030] In the diagram: 1. Base; 2. Placement platform; 3. Support rod; 31. Slide groove; 32. Plane; 4. Mounting bracket; 41. Sliding sleeve; 42. Horizontal plate; 43. Knob; 44. Slider; 5. Control component; 6. Insertion needle assembly; 61. Mounting sleeve; 611. Through hole; 62. Conduit; 63. First nut; 64. Needle body; 65. Pressure sensor; 66. Connecting sleeve; 67. First stud; 68. Limiting block; 69. Limiting position 7. Slot; 71. Trial mold; 71. First mold body; 711. Connecting ring; 72. Second mold body; 721. Filter cylinder; 722. Connecting slot; 73. Lifting block; 8. Clamping assembly; 81. Mounting plate; 82. Second telescopic device; 83. Clamping block; 9. Adjusting seat; 91. Support sleeve; 92. Second stud; 93. Second nut; 94. Support block; 941. Mounting slot; 95. Bearing; 10. Moving mechanism; 11. Level. Detailed Implementation

[0031] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0032] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

[0033] This embodiment mainly describes the structure of the concrete penetration resistance meter, as follows:

[0034] like Figures 1-12 As shown, the concrete penetration resistance meter includes a base 1, a moving mechanism 10 is provided in the base 1, and a placement platform 2 for placing the test mold 7 is provided on the moving mechanism 10. When the moving mechanism 10 is working, it can drive the placement platform 2 to move on the base 1, so that the test mold 7 located on the placement platform 2 also moves with the movement of the placement platform 2. A support rod 3 is also provided on the base 1, and a mounting frame 4 is provided on the support rod 3. A control component 5 for controlling the penetration of the penetration needle into the concrete is provided on the mounting frame 4, and a penetration needle component 6 is provided on the control component 5.

[0035] Therefore, when the concrete penetration resistance meter is in use, the screw moving mechanism 10 is first activated, which controls the placement platform 2 to move to the outside of the base 1. Then, the operator places the test mold 7 containing concrete onto the placement platform 2. The moving mechanism 10 is then activated again, which moves the placement platform 2 and the test mold 7 together to the bottom of the penetration needle assembly 6. Finally, the control assembly 5 is activated, which controls the penetration needle assembly 6 to test the concrete in the test mold 7. The moving mechanism 10 mentioned above is the screw moving mechanism 10, which is a common existing technology and is not described in detail.

[0036] To facilitate the replacement of the penetration needle, the penetration needle assembly 6 includes a mounting sleeve 61 installed on the control assembly 5, with an open bottom. A connecting sleeve 66 with an internal thread on its inner wall is provided in the mounting sleeve 61. At the same time, at least two limiting blocks 68 are provided on the outer wall of the connecting sleeve 66, and at least two limiting grooves 69 that slide in axial direction with the limiting blocks 68 are provided on the inner wall of the mounting sleeve 61. The bottom of the connecting sleeve 66 is open. A first stud 67 is screwed into the connecting sleeve 66. A needle body 64 for penetrating concrete is provided at the bottom of the first stud 67. To facilitate the turning of the first stud 67, a first nut 63 is fixedly provided on the first stud 67. Finally, a pressure sensor 65 is provided at the top of the mounting sleeve 61, so that when the connecting sleeve 66 moves upward in the mounting sleeve 61, the top of the connecting sleeve 66 can abut and press against the pressure sensor 65.

[0037] When the penetration needle needs to be replaced, the operator uses an open-end wrench to engage the first nut 63, and then rotates the open-end wrench to unscrew the first stud 67 from the connecting sleeve 66. This allows the needle body 64 to be removed together with the first stud 67. When installing the penetration needle, the first stud 67 is screwed into the connecting sleeve 66, and the operator uses an open-end wrench to tighten the first nut 63 to secure the first stud 67 to the connecting sleeve 66. This facilitates the replacement of the penetration needle and also allows the concrete penetration resistance meter to change penetration needles of different diameters when testing concrete of different hardness. When the needle body 64 penetrates the concrete, the connecting sleeve 66 moves upward along the limiting groove 69 in the mounting sleeve 61 via the limiting block 68 and squeezes the pressure sensor 65 in the mounting sleeve 61. When the pressure sensor 65 is squeezed, it can detect the pressure on the needle body 64.

[0038] Furthermore, in order to facilitate the wires on the pressure sensor 65 to pass through the mounting sleeve 61, a through hole 611 communicating with the inside of the mounting sleeve 61 is provided on the sleeve wall of the mounting sleeve 61, and a conduit 62 communicating with the through hole 611 is provided on the outer wall of the mounting sleeve 61.

[0039] Furthermore, to ensure the stability of the control component 5 when controlling the movement of the insertion needle assembly 6, the control component 5 includes a first telescopic device mounted on the mounting bracket 4, with the telescopic end of the first telescopic device facing the base 1. A connecting plate connected to the mounting sleeve 61 is provided at the telescopic end of the first telescopic device, so that the movement of the insertion needle assembly 6 can be controlled when the first telescopic device is activated. A telescopic rod is provided on the mounting bracket 4 at both ends of the first telescopic device, and the telescopic ends of both telescopic rods are connected to the top of the connecting plate. So that when the first telescopic device extends or retracts, the telescopic rods on the left and right sides of the first telescopic device also extend or retract accordingly, thus ensuring the stability of the control component 5 when controlling the movement of the insertion needle assembly 6.

[0040] Furthermore, to improve the stability of the test mold 7 on the placement platform 2, a clamping assembly 8 is provided on the placement platform 2. The clamping assembly 8 includes two mounting plates 81 symmetrically installed on the left and right ends of the placement platform 2. At the same time, two second telescopic devices 82 are horizontally provided on the adjacent side wall of each mounting plate 81. Each of the two telescopic devices 82 on each mounting plate 81 is provided with a clamping block 83 for clamping the test mold 7. In this way, when the test mold 7 is placed on the placement platform 2, the test mold 7 is located between the two clamping blocks 83. Then, the second telescopic device 82 is activated and the telescopic end of the second telescopic device 82 is extended. As the second telescopic device 82 extends, the clamping block 83 can clamp and fix the test mold 7, thus ensuring the stability of the test mold 7 on the placement platform 2.

[0041] Furthermore, to facilitate the transportation of the concrete penetration resistance meter, the support rod 3 and the base 1 are detachably connected by bolts. This reduces the space occupied by the concrete penetration resistance meter, thus facilitating its transportation.

[0042] Furthermore, to facilitate the assembly and disassembly of the mounting bracket 4 and the support rod 3, the mounting bracket 4 includes a sliding sleeve 41 that slidably engages with the support rod 3. A horizontal plate 42, connected to the control component 5, is horizontally mounted on the side wall of the sliding sleeve 41 near the test mold 7. To ensure the sliding sleeve 41 can be fixed to the support rod 3, two locking knobs 43 are provided on the outer wall of the sliding sleeve 41. The bottom of each knob 43 penetrates the sliding sleeve 41 and abuts against the outer wall of the support rod 3. The knobs 43 are screwed onto the sliding sleeve 41. Thus, when it is necessary to assemble or disassemble the mounting bracket 4, the mounting bracket 4 can be easily assembled or disassembled. When removing the frame 4 from the support rod 3, first remove the knob 43 from the sliding sleeve 41, and then remove the sliding sleeve 41 from the support rod 3. When installing the mounting frame 4 onto the support rod 3, slip the sliding sleeve 41 onto the support rod 3, and then install the knob 43 onto the sliding sleeve 41. At the same time, tighten the knob 43 so that the bottom of the knob 43 abuts against the outer wall of the support rod 3. This facilitates the disassembly and assembly of the mounting frame 4 and the support rod 3, and further facilitates the transportation of the concrete penetration resistance meter.

[0043] Furthermore, in order to ensure the stability of the sliding sleeve 41 moving on the support rod 3, at least two sliding grooves 31 are axially opened on the support rod 3. At the same time, a slider 44 matching the two sliding grooves 31 is provided on the inner wall of the sliding sleeve 41. In order to improve the contact effect between the knob 43 and the support rod 3, the side wall of the support rod 3 that contacts the knob 43 is set as a plane 32.

[0044] Furthermore, in order to ensure the accuracy of the test data, the test mold 7 includes a first mold 71 placed on the placement table 2, and the top of the first mold 71 is open. Then, a second mold 72 is placed on the top of the first mold 71, and the top of the second mold 72 is open. Then, a filter cylinder 721 is placed at the bottom of the second mold 72, and the bottom of the filter cylinder 721 can be inserted into the first mold 71.

[0045] When the operator adds the concrete to be tested to the test mold 7, the second mold 72 is first placed on the first mold 71, and the filter cylinder 721 installed at the bottom of the second mold 72 is inserted into the first mold 71. Then, the mixed concrete is poured into the second mold 72. After the concrete is added, the second mold 72 is removed from the first mold 71. Because the filter cylinder 721 is designed to block coarse aggregate, when the concrete penetration resistance meter tests the concrete in the first mold 71, it ensures that the test is of the concrete setting characteristics, eliminates the interference of coarse aggregate on the test data, and thus ensures the accuracy of the test data.

[0046] Furthermore, in order to improve the firmness of the connection between the first mold 71 and the second mold 72, a connecting ring 711 is provided on the top of the first mold 71, and a connecting groove 722 for accommodating the connecting ring 711 is provided at the bottom of the second mold 72. In addition, in order to facilitate the operation of the first mold 71 and the second mold 72, two lifting blocks 73 are provided on the outer walls of both the first mold 71 and the second mold 72.

[0047] Furthermore, to ensure that the upper surface of the base 1 is level, at least four adjustment seats 9 are provided at the bottom of the base 1. A level 11 is also provided on the base 1 for easy observation of whether the upper surface of the base 1 is level. Each adjustment seat 9 includes a support sleeve 91 connected to the bottom of the base 1, with an open bottom. An internal thread is provided on the inner wall of the support sleeve 91. A second stud 92 is screwed into the support sleeve 91, with its bottom protruding from the support sleeve 91. A support block 94 is provided at the bottom of the second stud 92, and a mounting bracket is provided at the top of the support block 94. The mounting groove 941 is provided with a bearing 95. The outer ring of the bearing 95 is fixedly connected to the side wall of the mounting groove 941, and the inner ring of the bearing 95 is fixedly connected to the outer wall of the second stud 92. Finally, a second nut 93 is provided at the bottom of the second stud 92 and is located above the support block 94. Thus, when the upper surface of the base 1 is adjusted to be level by using the adjusting seat 9, the level 11 is first observed to understand the current level of the upper surface of the base 1. If one side of the base 1 is too high or too low, causing the upper surface of the base 1 to be uneven, the adjusting seat 9 at the corresponding position can be adjusted to ensure the level of the upper surface of the base 1.

[0048] When adjusting the adjusting seat 9, the operator uses an open-end wrench to turn the second nut 93. If the upper surface of the base 1 is not level due to one side being too high, the operator can use an open-end wrench to turn the second nut 93 to screw the second stud 92 into the support sleeve 91. If the upper surface of the base 1 is not level due to one side being too low, the operator can use an open-end wrench to turn the second nut 93 to screw the second stud 92 out of the support sleeve 91.

[0049] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0050] The concrete penetration resistance meter provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand this utility model and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from its principle, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A concrete penetration resistance meter, comprising a base, a moving mechanism disposed therein, a placement platform for placing a test mold disposed on the moving mechanism, a support rod disposed on the base, a mounting frame disposed on the support rod, a control component for controlling the penetration of a penetration needle into the concrete disposed on the mounting frame, and a penetration needle assembly disposed on the control component, characterized in that: The insertion needle assembly includes Mounting sleeve, which is mounted on the control component, has an opening at the bottom; A connecting sleeve is installed in an installation sleeve. The inner wall of the connecting sleeve has an internal thread, and the outer wall of the connecting sleeve has at least two limiting blocks. The inner wall of the installation sleeve has at least two limiting grooves that slide in axially with the limiting blocks. The bottom of the connecting sleeve is open. The needle body has a first stud at its top, and the needle body is screwed to the connecting sleeve via the first stud. A first nut is fixedly provided on the first stud. A pressure sensor is mounted on top of a mounting sleeve, and the top of the connecting sleeve abuts against the pressure sensor when the connecting sleeve moves upward within the mounting sleeve.

2. The concrete penetration resistance meter according to claim 1, characterized in that: The control component includes A first telescopic device is mounted on a mounting frame, with the telescopic end of the first telescopic device facing the base. A connecting plate is installed at the telescopic end of the first telescopic device, and the mounting sleeve is connected to the bottom of the connecting plate; The telescopic rods are provided in at least two pieces, and both telescopic rods are mounted on the mounting frame. The two telescopic rods are located on the left and right sides of the first telescopic device, respectively, and the telescopic ends of the telescopic rods are connected to the top of the connecting plate.

3. The concrete penetration resistance meter according to claim 1, characterized in that: The placement platform is provided with a clamping assembly, the clamping assembly including... Mounting plate, two mounting plates are provided, and the two mounting plates are symmetrically installed at the left and right ends of the placement platform, respectively. Two second telescopic devices are horizontally provided on the adjacent side wall of each mounting plate. The clamping block consists of two blocks, which are symmetrically arranged at the telescopic end of the second telescopic device.

4. The concrete penetration resistance meter according to claim 1, characterized in that: The trial mold includes A first mold is placed on a placement platform, and the top of the first mold is open. The second mold body is installed on top of the first mold body, and the top of the second mold body is provided as an opening; A filter cylinder is installed at the bottom of the second mold body, and the bottom of the filter cylinder is inserted into the first mold body.

5. The concrete penetration resistance meter according to claim 1, characterized in that: The base has at least four adjustment seats at its bottom, each adjustment seat including... A support sleeve, the top of which is connected to the bottom of the base, the bottom of which is open, and the inner wall of which is threaded. The second stud is installed in the support sleeve and is screwed to the support sleeve. The bottom of the second stud protrudes from the support sleeve. A support block has an installation groove on its top, in which a bearing is installed. The outer ring of the bearing is fixedly connected to the side wall of the installation groove, and the inner ring of the bearing is fixedly connected to the outer wall of the second stud. The second nut is fixedly installed at the bottom of the second stud, and the second nut is located above the support block.

6. The concrete penetration resistance meter according to claim 1, characterized in that: The support rod is detachably connected to the base by bolts.

7. The concrete penetration resistance meter according to claim 1, characterized in that: The mounting bracket includes a sliding sleeve that is slidably connected to the support rod. The sliding sleeve has a horizontal plate on one side wall near the test mold. The control component is mounted on the horizontal plate. Two knobs for locking are provided on the outer wall of the sliding sleeve. The bottom of the knobs penetrates the sliding sleeve and abuts against the outer wall of the support rod. The knobs are screwed to the sliding sleeve.

8. The concrete penetration resistance meter according to claim 1, characterized in that: The mounting sleeve has a through hole on its sleeve wall that communicates with the inside of the mounting sleeve, and a conduit communicating with the through hole is provided on the outer wall of the mounting sleeve.

9. The concrete penetration resistance meter according to claim 4, characterized in that: The first mold body has a connecting ring at its top, and the second mold body has a connecting groove at its bottom to accommodate the connecting ring.

10. The concrete penetration resistance meter according to claim 7, characterized in that: The support rod has at least two axial grooves, and the inner wall of the sleeve is provided with a slider that matches the two grooves. The side wall of the support rod that abuts against the knob is flat.

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