Grid type measuring head and testing instrument

Abstract

The utility model discloses a grid-type measuring head and a testing instrument, the grid-type measuring head comprises a central shaft, a grid-type measuring plate and a sheet-type measuring plate, the central shaft is used for transmitting a rotating torque, the grid-type measuring plate is used for detecting the gap passing ability, the filling performance and the rheological property of concrete, and the sheet-type measuring plate is used for measuring the filling performance and the rheological property of the concrete. The sheet-type measuring plate has a first position, a second position and a third position and is used for assisting the grid-type measuring plate in different positions or completing a test together with the grid-type measuring plate, and the grid-type measuring head in the embodiment can complete various tests, is wide in application range and convenient to use, and can also improve the detection accuracy. The device is applied to the field of concrete detection.

Description

Technical Field

[0001] The utility model relates to the field of concrete detection, in particular to a grid type measuring head and a testing instrument. Background Art

[0002] The ICAR rheometer mainly consists of a cylinder for loading concrete specimens, a driving head composed of a motor and a torque sensor, a frame connecting the driver and the blade assembly to the top of the container, and a laptop computer. The rheometer calculates rheological parameters by recording the torque during the test. It can perform two measurement methods. The first is the stress growth test, and the measurement curve is a function of torque and time. The maximum torque of the measurement curve is obtained to calculate the static yield stress. The other test type is the flow curve test, and the measurement curve is a function of torque and rotational speed. The dynamic yield stress and plastic viscosity of concrete are calculated using this function.

[0003] Although the tools used above are common, they are extremely inconvenient for test measurements. Although the yield stress and plastic viscosity can reflect the fluidity and segregation resistance stability of concrete to a certain extent, they cannot characterize its gap passing performance. In addition, during the use of the commonly used rotary rheometer, the mixture will settle and segregate due to the action of gravity and stirring centrifugal force, resulting in distortion (being on the low side) of the test results. Therefore, the rheological property test method also needs to be used in combination with multiple inspection methods to comprehensively and accurately reflect the flow performance of concrete. The purpose of the utility model is to solve the problem that it is inconvenient to detect concrete by taking multiple samples. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a grid type measuring head, which can be used for multiple purposes, complete various performance detection tests, and improve the detection accuracy.

[0005] Two testing instruments with the above grid type measuring head are also provided.

[0006] The grid type measuring head according to the first aspect embodiment of the utility model includes:

[0007] A central axis;

[0008] A grid type measuring plate, connected to one end of the central axis;

[0009] A plate type measuring plate, slidably connected to the central axis and capable of moving along the axial direction of the central axis. The plate type measuring plate has a first position, a second position, and a third position;

[0010] Wherein, the chip-type measuring plate is configured to: at the first position, be arranged in sequence with the grid-type measuring plate along the axial direction of the central axis and be parallel to the grid-type measuring plate along the radial direction of the central axis; at the second position, the projection of the grid-type measuring plate along the radial direction of the central axis is located within the projection area of the chip-type measuring plate along the radial direction of the central axis; at the third position, be arranged in sequence with the grid-type measuring plate along the axial direction of the central axis and be arranged at an angle with the grid-type measuring plate along the radial direction of the central axis and remain fixed relative to the grid-type measuring plate.

[0011] The grid-type measuring head according to the first aspect embodiment of the present invention has at least the following beneficial effects:

[0012] 1. When the chip-type measuring plate is at the second position, place the grid-type measuring head in the test cup. The chip-type measuring plate can divide the test cup into two parts. Pour flowing concrete into one of the divided cavities of the test cup. Then, when the grid-type measuring head is lifted to the first position, by the speed of the concrete passing through the grid-type measuring plate and entering the other divided cavity, the gap passing performance of the concrete is detected, and the other divided cavity is filled with the concrete to complete the filling box test to test the filling performance of the concrete; when the chip-type measuring plate is at the third position, place the grid-type measuring head in the test cup and perform a rheological test by rotating the grid-type measuring head to test the rheological performance of the concrete; multiple tests are completed by the same grid-type measuring head, the application range of the grid-type measuring head is wider, and the use cost is lower;

[0013] 2. During the detection process, the grid-type measuring head drives the thinner concrete for detection, improving the accuracy of the detection results and being more conducive to detecting the concrete that settles and segregates due to the action of gravity and stirring centrifugal force.

[0014] According to some embodiments of the present invention, the grid-type measuring head further includes: a first locking member. The central axis is provided with a first fixing hole, the axial direction of the first fixing hole is arranged at an angle with the plane where the grid-type measuring plate is located, and the first locking member can clamp the chip-type measuring plate in the first fixing hole to fix the chip-type measuring plate at the third position.

[0015] According to some embodiments of the present invention, the chip-type measuring plate includes a main board portion and a socket portion connected to the main board portion. Along the axial direction of the central axis, the socket portion is located on the side of the main board portion away from the grid-type measuring plate, and the socket portion is slidably sleeved on the central axis.

[0016] According to some embodiments of the present utility model, the grid type measuring head further includes: a first locking member. The central shaft is provided with a first fixing hole, the axial direction of the first fixing hole is arranged at an angle with respect to the plane where the grid type measuring plate is located. The socket portion is provided with a first positioning hole, and the first locking member can pass through the first positioning hole and be locked in the first fixing hole to fix the sheet type measuring plate at the third position.

[0017] According to some embodiments of the present utility model, the sheet type measuring plate is configured to be arranged in sequence along the axial direction of the central shaft and perpendicular to the grid type measuring plate at the third position.

[0018] According to some embodiments of the present utility model, the grid type measuring head further includes: a second locking member. The central shaft is provided with a second fixing hole, the axial direction of the second fixing hole is arranged parallel to the plane where the grid type measuring plate is located. The second locking member can clamp the sheet type measuring plate in the second fixing hole to fix the sheet type measuring plate at the first position.

[0019] According to some embodiments of the present utility model, the grid type measuring head further includes: a third locking member. The central shaft is provided with a third fixing hole, the axial direction of the third fixing hole is arranged parallel to the plane where the grid type measuring plate is located. The third locking member can clamp the sheet type measuring plate in the third fixing hole to fix the sheet type measuring plate at the second position.

[0020] According to some embodiments of the present utility model, the grid type measuring plate includes a main rod portion and a plurality of grid tooth portions connected to the main rod portion. The plurality of grid tooth portions are sequentially and spaced apart along the length direction of the main rod portion, and all the grid tooth portions are connected to one side of the main rod portion far from the other end of the central shaft.

[0021] The testing instrument according to the second aspect embodiment of the present utility model includes:

[0022] A cup body having a detection cavity;

[0023] The grid type measuring head according to the first aspect embodiment of the present utility model is installed in the detection cavity, and the grid type measuring plate and the sheet type measuring plate can divide the detection cavity into a first sub-cavity and a second sub-cavity.

[0024] The testing instrument according to the second aspect embodiment of the present utility model has at least the following beneficial effects: it can perform various tests through the same grid type measuring head and improve the detection accuracy.

[0025] The testing instrument according to the third aspect embodiment of the present utility model includes:

[0026] A cup body having a detection cavity;

[0027] A grid-type measuring plate is disposed in the detection cavity and connected to the cup body;

[0028] A central axis is connected to the grid-type measuring plate;

[0029] A sheet-type measuring plate is slidably connected to the central axis and can move along the axial direction of the central axis. The sheet-type measuring plate has a first position and a second position;

[0030] Wherein, the sheet-type measuring plate is configured to: at the first position, be arranged in sequence with the grid-type measuring plate along the axial direction of the central axis and be parallel to the grid-type measuring plate along the radial direction of the central axis; at the second position, the projection of the grid-type measuring plate along the radial direction of the central axis is located within the projection area of the sheet-type measuring plate along the radial direction of the central axis.

[0031] The testing instrument according to the third aspect embodiment of the present utility model has at least the following beneficial effects: It can perform various tests through the same grid-type measuring head and improve the accuracy of detection.

[0032] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0033] The following further illustrates the present utility model in conjunction with the drawings and embodiments, wherein:

[0034] Figure 1 It is a schematic structural diagram of the grid-type measuring plate of the grid-type measuring head according to an embodiment of the present utility model connected to the central axis;

[0035] Figure 2 It is a schematic structural diagram of the grid-type measuring head according to an embodiment of the present utility model when the sheet-type measuring plate is in the first position;

[0036] Figure 3 It is a schematic structural diagram of the grid-type measuring head according to an embodiment of the present utility model when the sheet-type measuring plate is in the second position;

[0037] Figure 4 It is a schematic structural diagram of the grid-type measuring head according to an embodiment of the present utility model when the sheet-type measuring plate is in the third position;

[0038] Figure 5 It is a schematic structural diagram of the testing instrument according to an embodiment of the present utility model when the sheet-type measuring plate is in the first position;

[0039] Figure 6 It is a schematic structural diagram of the testing instrument according to an embodiment of the present utility model when the sheet-type measuring plate is in the second position;

[0040] Figure 7 Schematic diagram of the structure of the chip measurement board of a test instrument according to an embodiment of the present utility model when it is in the third position.

[0041] Reference numerals in the drawings:

[0042] Central axis 100; first fixing hole 110; second fixing hole 120; third fixing hole 130;

[0043] Grid measurement board 200; main rod part 210; grid tooth part 220;

[0044] Chip measurement board 300; main board part 310; socket part 320; first positioning hole 321;

[0045] Cup body 400; detection cavity 410. Detailed implementation manners

[0046] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0047] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as up and down, etc., is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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 should not be construed as a limitation of the present utility model.

[0048] In the description of the present utility model, several means one or more, and multiple means two or more. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0049] In the description of the present utility model, unless otherwise clearly defined, terms such as setting, installation, and connection should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0050] Refer to Figures 1 to 7As shown, the first embodiment of the utility model proposes a grid type measuring head, including: a central axis 100, a grid type measuring plate 200 and a sheet type measuring plate 300, the central axis 100 is used to transmit the torque, the grid type measuring plate 200 is used to detect the gap passability, filling performance and rheological properties of concrete, the sheet type measuring plate 300 has a first position, a second position and a third position, and is used to assist the grid type measuring plate 200 at different positions or complete the test together with the grid type measuring plate 200. The grid type measuring head in this embodiment can complete a variety of tests, has a wide range of applications, is easy to use, and can also improve the accuracy of detection.

[0051] The central shaft 100 is used to transmit the rotational torque. The central shaft 100 may be connected to the motor transmission and rotated under the drive of the motor; or it may be rotated manually by the user.

[0052] The grid measuring plate 200 is connected to one end of the central axis 100; when the grid measuring head is placed in the detection cup, the grid measuring plate 200 is located at the bottom of the detection cup to facilitate the concrete to pass through under the action of gravity; and both ends of the grid measuring plate 200 can abut against the inner wall of the detection cup so that the grid measuring plate 200 can separate the detection cavity 410 in the detection cup. For example, when the detection cavity 410 is cylindrical, the length of the grid measuring plate 200 is consistent with the diameter of the detection cavity 410; when the detection cavity 410 is rectangular, the grid measuring plate 200 is consistent with the short side of the detection cavity 410.

[0053] The sheet-type measuring plate 300 is slidably connected to the central axis 100 and can move along the axial direction of the central axis 100 . The sheet-type measuring plate 300 has a first position, a second position and a third position. The length of the sheet-type measuring plate 300 is consistent with the length of the grid-type measuring plate 200 .

[0054] Reference Figure 2 and Figure 5 As shown, the sheet-type measuring plate 300 is configured as follows: in the first position, along the axial direction of the central axis 100, the sheet-type measuring plate 300 and the grid-type measuring plate 200 are arranged in sequence, and along the radial direction of the central axis 100, the sheet-type measuring plate 300 is parallel to the grid-type measuring plate 200. In the first position, the sheet-type measuring plate 300 and the grid-type measuring plate 200 do not interfere with each other, and the grid-type measuring plate 200 located at the bottom of the detection cup can perform a concrete gap passability test.

[0055] Reference Figure 3 and Figure 6As shown, at the second position, the projection of the grid-type measuring plate 200 in the radial direction of the central axis 100 is located within the projection area of the sheet-type measuring plate 300 in the radial direction of the central axis 100. In other words, along the radial direction of the central axis 100, the grid-type measuring plate 200 is completely blocked by the sheet-type measuring plate 300. When the grid-type measuring head is located inside the test cup, the sheet-type measuring plate 300 can divide the test cup into two parts, forming two sub-chambers, and the fluids in the two sub-chambers are basically not interconnected. Flowable concrete is added to one of the sub-chambers, and the other sub-chamber remains empty. Then, the sheet-type measuring plate 300 is moved to the first position, and the flowable concrete flows into the empty sub-chamber to complete the filling box test to detect the filling performance of the flowable concrete.

[0056] Refer to Figure 4 And Figure 7 As shown, at the third position, along the axial direction of the central axis 100, the sheet-type measuring plate 300 and the grid-type measuring plate 200 are arranged in sequence; along the radial direction of the central axis 100, the sheet-type measuring plate 300 and the grid-type measuring plate 200 are arranged at an angle and remain fixed relative to the grid-type measuring plate 200. When the grid-type measuring head is placed inside the test cup, flowable concrete is poured into the test cup, and then the central axis 100 is rotated so that the sheet-type measuring plate 300 and the grid-type measuring plate 200 cut the concrete together to complete the rheological test to test the rheological properties of the concrete.

[0057] It is worth understanding that multiple tests are completed by the same grid-type measuring head, so the applicable range of the grid-type measuring head is wider and the use cost is lower; during the detection process, the grid-type measuring head drives the thinner concrete for detection, improving the accuracy of the detection results, and is more conducive to detecting the concrete that settles and segregates due to the action of gravity and stirring centrifugal force.

[0058] Refer to Figure 1 And Figure 4 As shown, in some specific embodiments of the present invention, the grid-type measuring head further includes: a first locking member. The central axis 100 is provided with a first fixing hole 110, and the axial direction of the first fixing hole 110 is arranged at an angle with the plane where the grid-type measuring plate 200 is located. The first locking member can clamp the sheet-type measuring plate 300 in the first fixing hole 110 to fix the sheet-type measuring plate 300 at the third position.

[0059] It is worth understanding that the sheet-type measuring plate 300 can be fixed at the third position by the first locking member, and the sheet-type measuring plate 300 and the grid-type measuring plate 200 remain relatively fixed at the third position, which is convenient for stirring the flowable concrete to conduct the rheological test to detect the rheological properties of the concrete.

[0060] In this embodiment, the first locking member is a locking bolt or a clamping pin.

[0061] Refer to Figure 1With Figure 4 As shown, in some specific embodiments of the present utility model, the chip-type measuring plate 300 includes a main board portion 310 and a socket portion 320 connected to the main board portion 310. Along the axial direction of the central axis 100, the socket portion 320 is located on the side of the main board portion 310 away from the grid-type measuring plate 200, and the socket portion 320 is slidably sleeved on the central axis 100.

[0062] It should be understood that the chip-type measuring plate 300 is slidably sleeved on the central axis 100 through the socket portion 320, so that the main body portion can move along the axial direction of the central axis 100. At the same time, there is a certain misalignment between the main board portion 310 and the central axis 100. The main board portion 310 can be rotated through the socket portion 320 to be opposite to the grid-type measuring plate 200 along the radial direction of the central axis 100, and there is a certain gap between the main board portion 310 and the grid-type measuring plate 200 along the radial direction of the central axis 100. By moving the socket portion 320 along the axial direction of the central axis 100, the main board portion 310 is moved to be opposite to the grid-type measuring plate 200, and along the radial direction of the central axis 100, the two completely overlap, realizing that the chip-type measuring plate 300 completely isolates the detection cavity 410 of the detection cup.

[0063] Refer to Figure 1 With Figure 4 As shown, in some specific embodiments of the present utility model, the grid-type measuring head further includes: a first locking member. The central axis 100 is provided with a first fixing hole 110, the axial direction of the first fixing hole 110 is arranged at an angle with the plane where the grid-type measuring plate 200 is located, the socket portion 320 is provided with a first positioning hole 321, and the first locking member can pass through the first positioning hole 321 and be locked in the first fixing hole 110 to fix the chip-type measuring plate 300 at the third position.

[0064] It should be understood that the socket portion 320 is provided with a first positioning hole 321, and the first locking member passes through the first positioning hole 321 and is connected to the first fixing hole 110, which makes the installation of the first locking member more convenient. As another implementation manner, it may also be that the main board portion 310 is provided with a second positioning hole, and the first locking member passes through the second positioning hole and is connected to the first fixing hole 110.

[0065] Refer to Figure 4 With Figure 7 As shown, in some specific embodiments of the present utility model, the chip-type measuring plate 300 is configured to be arranged in sequence with the grid-type measuring plate 200 along the axial direction of the central axis 100 and perpendicular to the grid-type measuring plate 200 at the third position.

[0066] It should be understood that the chip-type measuring plate 300 is perpendicular to the grid-type measuring plate 200, and the projections of the two along the axial direction of the central axis 100 are in a "cross" shape, so that the concrete is divided more evenly, there are fewer variables in the rheological test, and the test accuracy is higher.

[0067] Refer to Figure 1 As shown in relation to Figure 2 In some specific embodiments of the present utility model, the grid type measuring head further includes: a second locking member. The central shaft 100 is provided with a second fixing hole 120, and the axial direction of the second fixing hole 120 is arranged parallel to the plane where the grid type measuring plate 200 is located. The second locking member can clamp the chip type measuring plate 300 in the second fixing hole 120 to fix the chip type measuring plate 300 at the first position.

[0068] It is worth understanding that the second locking member fixes the chip type measuring plate 300 at the first position through the second fixing hole 120, which is convenient for conducting the concrete gap passing test and the filling box test. In this embodiment, the chip type measuring plate 300 is aligned with the second fixing hole 120 through the first positioning hole 321. The second fixing hole 120 and the first fixing hole 110 are arranged at an angle, and this angle is the same as the angle between the chip type measuring plate 300 and the grid type measuring plate 200 at the third position. For example, at the third position, when the chip type measuring plate 300 and the grid type measuring plate 200 are arranged at "90°", the axis of the second fixing hole 120 and the axis of the first fixing hole 110 are arranged at "90°". Among them, the second locking member can be a bolt or a pin. The chip type measuring plate 300 can also be aligned with the second fixing hole 120 through the second positioning hole of the main board portion 310.

[0069] Refer to Figure 1 As shown in relation to Figure 3 In some specific embodiments of the present utility model, the grid type measuring head further includes: a third locking member. The central shaft 100 is provided with a third fixing hole 130, and the axial direction of the third fixing hole 130 is arranged parallel to the plane where the grid type measuring plate 200 is located. The third locking member can clamp the chip type measuring plate 300 in the third fixing hole 130 to fix the chip type measuring plate 300 at the second position.

[0070] It is worth understanding that the third locking member fixes the chip type measuring plate 300 at the second position through the third fixing hole 130, which is convenient for the preparation work of the filling box test. Moreover, the chip type measuring plate 300 can stably block the grid type measuring plate 200, improving the reliability of use. In this embodiment, positioning is carried out through the first positioning hole 321 of the chip type measuring plate 300. When the first positioning hole 321 is aligned with the third fixing hole 130, the third locking member fixes the chip type measuring plate 300 on the central shaft 100, so that the chip type measuring plate 300 cannot move along the axial direction of the central shaft 100. The chip type measuring plate 300 receives the impact of flowing concrete in a fixed state and is not easily displaced, making the use more reliable.

[0071] Refer to Figure 1As shown, in some specific embodiments of the present utility model, the grid-type measuring plate 200 includes a main rod portion 210 and a plurality of grid tooth portions 220 connected to the main rod portion 210. The plurality of grid tooth portions 220 are sequentially and spaced apart along the length direction of the main rod portion 210, and all the grid tooth portions 220 are connected to one side of the main rod portion 210 away from the other end of the central axis 100. It should be understood that through the interval between two grid tooth portions 220, for flowing concrete to pass through, the gap passability test of flowing concrete is realized, and it is more convenient to use.

[0072] Referring to Figures 4 to 7 As shown, in the second aspect embodiment of the present utility model, a testing instrument is proposed, including: a cup body 400 and the grid-type measuring head of the first aspect embodiment of the present utility model.

[0073] The cup body 400 has a detection cavity 410. Generally, the cup body 400 has a cylindrical detection cavity 410, and the cup body 400 itself can be cylindrical or rectangular. That is, when the detection cavity 410 is cylindrical, the cup body 400 can be a cylindrical shape similar to the detection cavity 410, or the rectangular cup body 400 is provided with a cylindrical detection cavity 410. The grid-type measuring head of the first aspect embodiment of the present utility model is installed in the detection cavity 410. The grid-type measuring plate 200 and the sheet-type measuring plate 300 can divide the detection cavity 410 into a first sub-cavity and a second sub-cavity, so as to facilitate the filling box test. It should be understood that the testing instrument can perform multiple tests through the same grid-type measuring head and improve the detection accuracy.

[0074] In some specific embodiments of the present utility model, in the third aspect embodiment of the present utility model, a testing instrument is proposed, including: a cup body 400, a grid-type measuring plate 200, a central axis 100, and a sheet-type measuring plate 300.

[0075] The cup body 400 has a detection cavity 410. Generally, the cup body 400 has a cylindrical detection cavity 410, and the cup body 400 itself can be cylindrical or rectangular. That is, when the detection cavity 410 is cylindrical, the cup body 400 can be a cylindrical shape similar to the detection cavity 410, or the rectangular cup body 400 is provided with a cylindrical detection cavity 410.

[0076] The grid-type measuring plate 200 is disposed in the detection cavity 410 and connected to the cup body 400; the grid-type measuring plate 200 is fixed in the cup body 400 and can perform the filling box test and the gap passability test. The central axis 100 is connected to the grid-type measuring plate 200; the central axis 100 can be integrally connected to the grid-type measuring plate 200 or detachably connected to the grid-type measuring plate 200.

[0077] The chip-type measuring plate 300 is slidably connected to the central axis 100 and can move along the axial direction of the central axis 100. The chip-type measuring plate 300 has a first position and a second position. Among them, the chip-type measuring plate 300 is configured as follows: in the first position, along the axial direction of the central axis 100, the chip-type measuring plate 300 and the grid-type measuring plate 200 are arranged in sequence, and along the radial direction of the central axis 100, the chip-type measuring plate 300 is parallel to the grid-type measuring plate 200. In the first position, the chip-type measuring plate 300 and the grid-type measuring plate 200 do not interfere with each other, and the grid-type measuring plate 200 located at the bottom of the test cup can perform the concrete clearance passability test.

[0078] In the second position, the projection of the grid-type measuring plate 200 along the radial direction of the central axis 100 is located within the projection area of the chip-type measuring plate 300 along the radial direction of the central axis 100. In other words, along the radial direction of the central axis 100, the grid-type measuring plate 200 is completely blocked by the chip-type measuring plate 300. When the grid-type measuring head is located inside the test cup, the chip-type measuring plate 300 can divide the test cup into two parts, forming two sub-chambers, and the fluids in the two sub-chambers are basically not interconnected. Flowable concrete is added to one of the sub-chambers, and the other sub-chamber remains empty. Then, the chip-type measuring plate 300 is moved to the first position, and the flowable concrete flows into the empty sub-chamber to complete the filling box test to detect the filling performance of the flowable concrete.

[0079] It should be understood that the test instrument can perform multiple tests through the same grid-type measuring head and improve the accuracy of detection.

[0080] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A grating measuring head, characterized in that: include: Central axis; A grid-type measuring plate connected to one end of the central axis; a sheet-type measuring plate, slidably connected to the central axis and capable of moving along the axial direction of the central axis, the sheet-type measuring plate having a first position, a second position and a third position; Wherein, the sheet-type measuring plate is configured as follows: in the first position, it is arranged in sequence with the grid-type measuring plate along the axial direction of the central axis, and is parallel to the grid-type measuring plate along the radial direction of the central axis; in the second position, the projection of the grid-type measuring plate along the radial direction of the central axis is located within the projection area of ​​the sheet-type measuring plate along the radial direction of the central axis; in the third position, it is arranged in sequence with the grid-type measuring plate along the axial direction of the central axis, and is arranged at an angle with the grid-type measuring plate along the radial direction of the central axis, and is kept fixed relative to the grid-type measuring plate.

2. The grating type measuring head according to claim 1, characterized in that: Also includes: A first locking member, the central axis is provided with a first fixing hole, the axial direction of the first fixing hole is set at an angle with the plane where the grid type measuring plate is located, and the first locking member can clamp the sheet type measuring plate in the first fixing hole to fix the sheet type measuring plate in the third position.

3. The grating type measuring head according to claim 1, characterized in that: The sheet-type measuring plate comprises a main board portion and a sleeve portion connected to the main board portion. Along the axial direction of the central axis, the sleeve portion is located on a side of the main board portion away from the grid-type measuring plate, and the sleeve portion is slidably sleeved on the central axis.

4. The grating type measuring head according to claim 3, characterized in that: Also includes: A first locking piece, the central axis is provided with a first fixing hole, the axial direction of the first fixing hole is set at an angle with the plane where the grid type measuring plate is located, the sleeve portion is provided with a first positioning hole, the first locking piece can pass through the first positioning hole and be locked in the first fixing hole to fix the sheet type measuring plate at the third position.

5. The grating type measuring head according to claim 3, characterized in that: The sheet-type measuring plate is configured to be arranged in sequence with the grid-type measuring plate along the axial direction of the central axis at the third position, and to be perpendicular to the grid-type measuring plate.

6. The grating type measuring head according to claim 1, characterized in that: Also includes: A second locking piece, the central axis is provided with a second fixing hole, the axial direction of the second fixing hole is arranged parallel to the plane where the grid type measuring plate is located, and the second locking piece can clamp the sheet type measuring plate in the second fixing hole to fix the sheet type measuring plate in the first position.

7. The grating type measuring head according to claim 1, characterized in that: Also includes: A third locking piece, the central axis is provided with a third fixing hole, the axial direction of the third fixing hole is arranged parallel to the plane where the grid type measuring plate is located, and the third locking piece can clamp the sheet type measuring plate in the third fixing hole to fix the sheet type measuring plate in the second position.

8. The grating type measuring head according to claim 1, characterized in that: The grid type measuring plate comprises a main rod and a plurality of grid teeth connected to the main rod, wherein the plurality of grid teeth are sequentially spaced along the length direction of the main rod, and all the grid teeth are connected to one side of the main rod away from the other end of the central axis.

9. A testing instrument, characterized in that: include: A cup body having a detection cavity; The grid-type measuring head according to any one of claims 1 to 8 is installed in the detection chamber, and the grid-type measuring plate and the sheet-type measuring plate can separate the detection chamber into a first sub-chamber and a second sub-chamber.

10. A testing instrument, characterized in that: include: A cup body having a detection cavity; A grid-type measuring plate is disposed in the detection cavity and connected to the cup body; A central axis connected to the grid-type measuring plate; A sheet-type measuring plate, slidably connected to the central axis and movable along the axial direction of the central axis, the sheet-type measuring plate having a first position and a second position; Wherein, the sheet-type measuring plate is configured as follows: in the first position, it is arranged in sequence with the grid-type measuring plate along the axial direction of the central axis, and is parallel to the grid-type measuring plate along the radial direction of the central axis; in the second position, the projection of the grid-type measuring plate along the radial direction of the central axis is located within the projection area of ​​the sheet-type measuring plate along the radial direction of the central axis.

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