Sample grinding device for concrete bubble spacing measurement

Abstract

The utility model discloses a sample grinding device for concrete bubble spacing measurement, which belongs to the technical field of concrete grinding and measurement and comprises a base, a lifting mechanism, a pressure detection device and a clamp mechanism, the lifting mechanism, the pressure detection device and the clamp mechanism are arranged on the base, and the pressure detection device feeds back pressure signals to a controller to control a rotating motor to rotate forwards or backwards. The screw drives the lifting frame to ascend and descend, pressure applied to a test piece by the pressure detection device is adjusted, the vertical section of the lifting frame is provided with a first matching part, the fixing frame is provided with a second matching part, and the first matching part is matched with the second matching part and used for stopping rotation of the lifting frame. It is guaranteed that the clamp mechanism does not generate horizontal deviation in the vertical lifting direction, and the test piece is ground within the controllable applied pressure. The device solves the problems that an existing device cannot detect and accurately adjust applied pressure in real time, and a test piece is prone to insufficient grinding or excessive abrasion, the grinding effect is improved, and the service life of the device is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete grinding and measurement, in particular to a sample grinding device used for measuring concrete bubble spacing. Background Art

[0002] The bubble spacing coefficient refers to the average distance from any point in the slurry to the pores. The bubble spacing coefficient has a direct impact on the frost resistance, permeability, durability and other aspects of concrete because it is closely related to the distribution of connected pores and closed pores inside the concrete. Appropriate bubble spacing can prevent ice crystals from connecting with each other during growth and forming large ice expansion stress, thereby improving the frost resistance of concrete. Larger bubble spacing means that the continuous pore network inside the concrete is relatively sparse, reducing the transmission channels of moisture and harmful ions, thereby reducing the penetration rate and improving the impermeability of concrete. Ideal bubble spacing helps to reduce the penetration depth and rate of moisture and corrosive media, reduce the possibility of steel corrosion inside the concrete, and delay the carbonization process. At present, the concrete bubble spacing coefficient tester is often used to measure and analyze the bubbles in concrete. Before the test, the concrete surface needs to be finely polished to achieve a smooth surface to facilitate measurement and analysis by the bubble spacing coefficient tester.

[0003] The utility model with the existing authorization announcement number CN216718437U discloses a grinding device for measuring the spacing between concrete bubbles, including a grinding machine main unit arranged vertically downward, a dust suppression pipe arranged on the outer side wall of the grinding machine main unit and facing below the grinding machine, a socket mounting head arranged at the end of the output shaft of the grinding machine main unit, and a docking cover detachably connected to the socket mounting head, and a grinding machine is fixed on the lower surface of the docking cover. This grinding machine device relies on the operator's experience to manually lift or press the grinding machine device to adjust the applied pressure, which is easily affected by human judgment deviation. At the same time, it is impossible to detect and accurately adjust the applied pressure in real time according to the sample hardness and grinding accuracy requirements, which easily causes insufficient grinding or excessive wear of the test piece, greatly affecting the grinding effect. Utility Model Content

[0004] In order to solve the technical problem that the existing grinding device cannot detect and accurately adjust the pressure applied to the test piece in real time, which easily causes insufficient grinding or excessive wear and reduces the grinding effect, the utility model provides a grinding device for measuring the concrete bubble spacing, which can detect and accurately adjust the applied pressure in real time and improve the grinding effect of the grinding device.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] The sample grinding device for measuring the spacing between concrete bubbles comprises a base, a lifting mechanism arranged on the base, a pressure detection device and a clamp mechanism. The lifting mechanism comprises a fixed frame and a lifting frame. A rotating motor is fixedly arranged on the fixed frame. A screw is fixedly arranged on the output shaft of the rotating motor. The screw is threadedly connected to the lifting frame. One end of the screw is connected to the output shaft of the rotating motor. The lifting frame and the screw form a spiral transmission pair. A first matching part is arranged on the vertical section of the lifting frame. A second matching part is arranged on the fixed frame. The vertical section of the lifting frame is penetrated by the fixed frame. The first matching part and the second matching part cooperate with each other to control the lifting frame to make linear motion in the vertical direction. A pressure detection device is arranged on the lifting frame. The pressure detection device is used to detect the pressure applied to the test piece. A clamp mechanism is connected below the pressure detection device. The clamp mechanism is used to clamp the test piece. At least two wires are vertically arranged below the lifting frame. A limit nut is arranged at the lower end of the wire. The wire is used for guiding the movement of the clamp mechanism. A controller for converting transmission signals and controlling the rotating motor is arranged between the pressure detection device and the rotating motor. The pressure detection device and the rotating motor are electrically connected to the controller respectively. The controller used in this solution is known to those skilled in the art. It uses a well-known computer program to convert the electrical signal of the pressure detection device into an electrical signal for controlling the forward or reverse rotation of the rotating motor, and has been used in the market.

[0007] Furthermore, the cross section of the vertical section of the lifting frame is square, and a square through hole is provided on the top of the fixing frame to cooperate with the clearance of the outer peripheral side of the vertical section of the lifting frame.

[0008] Furthermore, the pressure detection device includes a pressure sensor, a sleeve, a compression spring and a fixed rod. The fixed rod is fixedly set on the lifting frame, and the pressure sensor is fixedly connected under the fixed rod. One end of the compression spring is connected to the pressure sensor, and the other end is connected to the clamp mechanism. The sleeve is vertically arranged, and the upper end of the sleeve is fixedly connected to the fixed rod and is sleeved outside the compression spring for guiding the extension and retraction of the compression spring.

[0009] Furthermore, the clamp mechanism includes a fixed plate, an angle steel specimen card, a locking screw and a locking nut, the fixed plate is provided with a guide through hole cooperating with the through wire, the bottom surface of the fixed plate is provided with a guide slide groove, a sliding screw that can slide along the guide slide groove is provided in the guide slide groove, and two left and right angle steel specimen cards are provided on the bottom surface of the fixed plate. A first through hole is provided on the horizontal side surface of the angle steel specimen card, and the threaded end of the sliding screw is passed through the first through hole, and the threaded end is screwed into the nut. The left and right angle steel specimen cards slide along the guide slide groove through the sliding screw, and a second through hole is provided on the vertical side surface of the angle steel specimen card, and a locking screw is passed through the second through hole. Locking nuts are provided at both ends of the locking screw, and the angle steel specimen card is clamped to the specimen by tightening the locking nut. When the specimen is in a locked state, the angle steel specimen card is fixed to the fixed plate by tightening the nut of the sliding screw.

[0010] Furthermore, the fixing frame includes a large sleeve, a small sleeve and a positioning pin. The small sleeve is sleeved in the large sleeve. The large sleeve and the small sleeve have correspondingly multiple vertically arranged positioning holes. The positioning pin is installed in the positioning hole for fixing the large sleeve and the small sleeve. The rotating motor is fixedly arranged in the small sleeve.

[0011] Furthermore, a hanging piece is fixedly provided on the small sleeve, the hanging piece is arranged horizontally, and is provided with an avoidance hole for avoiding the pressure detection device, one end of the through wire is connected to the hanging piece, and the other end cooperates with the clamp mechanism.

[0012] Furthermore, a diagonal brace is provided between the hanging member and the small sleeve.

[0013] Furthermore, an oblique support rod is arranged between the hanging member and the harness.

[0014] The beneficial effects of the utility model are:

[0015] This solution provides a sample grinding device that can detect and accurately adjust the applied pressure in real time, and feeds back the pressure signal to the controller through the pressure detection device, controls the forward or reverse rotation of the rotating motor, drives the lifting frame to rise and fall through the screw, and adjusts the pressure applied by the pressure detection device on the test piece, thereby ensuring that the test piece is ground within a controllable applied pressure, making the grinding regular and stable. At the same time, a thread is provided to guide and limit the lifting of the clamp mechanism, thereby ensuring that the clamp mechanism does not produce horizontal deviation when it is lifted in the vertical direction, thereby improving the grinding flatness and force stability of the test piece, and at the same time limiting the rotation of the clamp mechanism to prevent the clamp mechanism from being affected by the pre-grinder and causing rotational deviation.

[0016] The cross section of the vertical section of the lifting frame is set to a square, and a square through hole matching the lifting frame is set on the top of the fixed frame, so as to achieve the effect of stopping rotation. The structure is simple and the manufacturing cost is low, which ensures that the lifting frame only completes linear motion in the vertical direction.

[0017] The pressure detection device includes a pressure sensor, a sleeve, a compression spring and a fixed rod. The compression length of the compression spring is adjusted by raising and lowering the fixed rod, thereby adjusting the force applied to the test piece. At the same time, the pressure sensor is arranged at the upper end of the compression spring, which can detect the compression force of the compression spring in real time. At the same time, the compression spring is used as an intermediate medium, which can not only transmit the applied pressure, but also provide a buffer for the test piece when the test piece is bumped or jumped, avoiding rigid contact and damaging the test piece and the grinding device. The sleeve is sleeved on the outside of the compression spring, and the outer diameter of the compression spring is consistent with the inner diameter of the sleeve, ensuring that the compression spring expands and contracts in the vertical direction without twisting in the horizontal direction, thereby ensuring the stability of the device.

[0018] A clamp mechanism is adopted which is composed of a fixed plate, an angle steel specimen card, a locking screw and a locking nut. The angle steel specimen card can slide along the guide groove of the fixed plate, and the clamp mechanism can be adjusted to adapt to specimens of different sizes. Locking screws and locking nuts are also provided to tighten the left and right angle steel specimen cards so as to clamp the specimen through the angle steel specimen cards. At this time, the nut of the sliding screw is tightened to fix the angle steel specimen card on the fixed plate, thereby ensuring that the clamp mechanism can adapt to specimens of different specifications, and the clamping capacity and stability of the clamp mechanism are ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a sample grinding device for measuring the spacing between concrete bubbles of the utility model;

[0020] Figure 2 yes Figure 1 A partial enlarged view of middle A;

[0021] Figure 3 yes Figure 1 A partial side view of the

[0022] Marked in the figure, 1-base, 2-large sleeve, 3-positioning pin, 4-rotating motor, 5-screw, 6-small sleeve, 7-lifting frame, 8-fixed rod, 9-pressure sensor, 10-suspension part, 11-sleeve, 12-compression spring, 13-fixed plate, 14-limit nut, 15-angle steel specimen card, 16-locking nut, 17-test specimen, 18-pre-grinder, 19-sliding screw, 20-through wire, 21-diagonal brace, 22-diagonal brace rod, 23-controller, 24-square through hole, 25-guide groove, 26-locking screw. DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the embodiments of the present application more clearly expressed, the present invention is further described below in conjunction with the accompanying drawings.

[0024] First of all, it needs to be stated that the technical solutions of the embodiments of the present application are clearly and completely described. The described embodiments are part of the embodiments of the present application, rather than limitations of the present utility model. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present application.

[0025] In the description of the present invention, it should be understood that the orientations or positional relationships indicated by terms such as “first”, “second”, “upper”, “lower”, “left”, “right”, “inner”, “outer”, “axial” or “radial” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They are not intended to indicate or imply that the device or element referred to must have a specific orientation structure and operation, and therefore cannot be understood as a limitation on the present invention.

[0026] It should be noted that, in the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection: it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Reference Figures 1 to 3 The utility model provides a sample grinding device for measuring the distance between concrete bubbles.

[0028] In an embodiment of the present scheme, a grinding sample device for measuring the spacing between concrete bubbles comprises a base 1, a lifting mechanism arranged on the base 1, a pressure detection device and a clamp mechanism, wherein the lifting mechanism comprises a fixed frame and a lifting frame 7, a rotating motor 4 is fixedly arranged on the fixed frame, a screw 5 is fixedly arranged on the output shaft of the rotating motor 4, the screw 5 is threadedly connected to the lifting frame 7, one end of the screw 5 is connected to the output shaft of the rotating motor 4, the lifting frame 7 and the screw 5 form a spiral transmission pair, the vertical section of the lifting frame 7 is provided with a first matching portion, the fixed frame is provided with a second matching portion, the vertical section of the lifting frame 7 is penetrated by the fixed frame, and the first matching portion and the second matching portion are connected. The engaging parts cooperate with each other and are used to control the lifting frame 7 to make linear motion in the vertical direction. The pressure detection device is arranged on the lifting frame 7. The pressure detection device is used to detect the pressure applied to the test piece 17. A clamp mechanism is connected below the pressure detection device. The clamp mechanism is used to clamp the test piece 17. At least two through wires 20 are vertically arranged below the lifting frame 7. A limiting nut 14 is arranged at the lower end of the through wire 20. The through wire 20 is used for guiding the movement of the clamp mechanism. A controller 23 for converting transmission signals and controlling the rotating motor 4 is arranged between the pressure detection device and the rotating motor 4. The pressure detection device and the rotating motor 4 are electrically connected to the controller 23 respectively. The working process is to preset the expected pressure range of the pressure detection device, and the pressure detection device detects the applied pressure in real time, transmits the pressure signal to the controller 23, and then controls the rotating motor 4 to rotate forward or reverse. When the applied pressure is greater than the maximum value of the expected pressure range, the rotating motor 4 rotates forward, drives the screw 5 to rotate forward, and then drives the lifting frame 7 to rise, adjusts the pressure detection device, and reduces the applied pressure on the specimen 17; when the applied pressure is less than the minimum value of the expected pressure range, the rotating motor 4 reverses, drives the screw 5 to rotate in the opposite direction, and then drives the lifting frame 7 to descend, adjusts the pressure detection device, and increases the applied pressure on the specimen 17; when the applied pressure is in the expected pressure range, it keeps working in the current state. This grinding device that can detect and accurately adjust the applied pressure in real time ensures that the specimen 17 is ground on the pre-grinder 18 within the controllable applied pressure, so that the grinding is regular and stable.

[0029] In this solution, the entire vertical section of the lifting frame 7 can be set as a square column. In this case, the entire vertical section is the first matching part, and the fixed frame is provided with a square hole for matching. In this case, the square hole is the second matching part, which is used to limit the rotation of the lifting frame 7; a part of the vertical section of the lifting frame 7 can also be set as a square. In this case, this part of the area is the first matching part, which matches with the second matching part. A flange for stopping rotation can also be welded on the top of the fixed frame. The center of the flange is a through hole, and the flange is matched with the first matching part of the lifting frame 7 to stop rotation. In addition to setting the cross section as a square, it can also be set as other special shapes, such as triangles, pentagons, hexagons or other irregular shapes, as long as the purpose of stopping rotation can be achieved. At least two wires 20 are arranged below the lifting frame 7, which can be directly connected to the lifting frame 7, or a mounting structure can be set below the lifting frame 7 for installing the wires 20. The limiting nut 14 at the lower end of the wires 20 contacts the clamp mechanism to prevent the wires 20 from escaping from the guide track of the clamp mechanism, so that the clamp mechanism can be lifted, guided and limited in the vertical direction, ensuring that the clamp mechanism does not produce horizontal deviation when it is lifted in the vertical direction, improving the grinding flatness and force stability of the specimen 17, and at the same time limiting the rotation of the clamp mechanism to prevent the clamp mechanism from being affected by the pre-grinder 18 and causing rotational deviation.

[0030] In the embodiment of this scheme, the cross section of the vertical section of the lifting frame 7 is square, and a square through hole 24 is provided on the top of the fixing frame to be clearance-matched with the outer peripheral side of the vertical section of the lifting frame 7. In this way, the function of stopping rotation is achieved, the structure is simple, the manufacturing cost is low, and it is ensured that the lifting frame 7 only completes linear motion in the vertical direction.

[0031] In an embodiment of the present scheme, the pressure detection device includes a pressure sensor 9, a sleeve 11, a compression spring 12 and a fixed rod 8. The fixed rod 8 is fixedly arranged on the lifting frame 7, and the pressure sensor 9 is fixedly connected to the lower part of the fixed rod 8. One end of the compression spring 12 is connected to the pressure sensor 9, and the other end is connected to the clamp mechanism. The sleeve 11 is vertically arranged, and the upper end of the sleeve 11 is fixedly connected to the fixed rod 8, and is sleeved outside the compression spring 12 for telescopic guidance of the compression spring 12. When the applied pressure is greater than the maximum value of the expected pressure range, the rotating motor 4 rotates forward, driving the screw 5 to rotate forward, and then driving the lifting frame 7 to rise, so that the compression amount of the compression spring 12 is reduced, and the applied pressure on the test piece 17 is reduced. When the applied pressure is less than the minimum value of the expected pressure range, the rotating motor 4 reverses, driving the screw 5 to rotate in the opposite direction, and then driving the lifting frame 7 to descend, so that the compression amount of the compression spring 12 is increased, and the applied pressure on the test piece 17 is increased. The outer diameter of the compression spring 12 is consistent with the inner diameter of the sleeve 11, ensuring that the compression spring 12 is stretched in the vertical direction and not twisted in the horizontal direction, thereby ensuring the stability of the device. In addition to using the compression spring 12 as an intermediate medium for transmitting pressure, a rigid rod can also be used to connect the pressure sensor 9 and the clamp mechanism respectively, or a rigid rod and a spring can be used in combination. For example, one end of the rigid rod is connected to the clamp mechanism, and the other end is connected to the spring, and the spring is installed between the rigid rod and the pressure sensor 9, or the rigid rod is installed between the pressure sensor 9 and the clamp mechanism, and a shock-absorbing spring is installed between the test piece 17 and the clamp mechanism, so as to measure and transmit the applied pressure.

[0032] In the embodiment of the present scheme, the clamp mechanism includes a fixed plate 13, an angle steel specimen card 15, a locking screw 26 and a locking nut 16, the fixed plate 13 is provided with a guide through hole matched with the through wire 20, the bottom surface of the fixed plate 13 is provided with a guide groove 25, and a sliding screw 19 that can slide along the guide groove 25 is provided in the guide groove 25, and the bottom surface of the fixed plate 13 is provided with two left and right angle steel specimen cards 15, and a first through hole is provided on the horizontal side of the angle steel specimen card 15, and the threaded end of the sliding screw 19 is passed through It is arranged in the first through hole, and the nut is screwed into the threaded end. The left and right angle steel specimen clamps 15 slide along the guide groove 25 through the sliding screw 19. A second through hole is opened on the vertical side of the angle steel specimen clamp 15. A locking screw 26 is passed through the second through hole. Locking nuts 16 are arranged at both ends of the locking screw 26. The angle steel specimen clamp 15 clamps the specimen 17 by tightening the locking nut 16. When the specimen 17 is in a locked state, the angle steel specimen clamp 15 is fixed to the fixed plate 13 by tightening the nut of the sliding screw 19. There is no limit to the number of guide slots 25, which can be one, two, or even three or more. To reduce processing costs, only one guide slot 25 may be provided. The angle steel specimen clamps 15 on the left and right sides can slide along the guide slots 25 of the fixed plate 13 through the sliding screws 19, and the clamp mechanism can be adjusted to adapt to specimens 17 of different sizes. For the setting of the locking screws 26, it is optional to set one or two locking screws 26, tighten the locking nuts 16, and tighten the left and right angle steel specimen clamps 15 to clamp the specimen 17. When the specimen 17 is in the locked state, the nut of the sliding screw 19 is tightened to fix the angle steel specimen clamp 15 on the fixed plate 13. Such a setting has a simple structure and low cost, and also ensures that the clamp mechanism can adapt to specimens 17 of different specifications, as well as the clamping capacity and stability of the clamp mechanism.

[0033] In the embodiment of the present scheme, the fixing frame includes a large sleeve 2, a small sleeve 6 and a positioning pin 3. The small sleeve 6 is sleeved in the large sleeve 2. The large sleeve 2 and the small sleeve 6 are provided with a plurality of vertically arranged positioning holes respectively. The positioning pin 3 is installed in the positioning holes for fixing the large sleeve 2 and the small sleeve 6. Here, the outer contours of the large sleeve 2 and the small sleeve 6 can be square tubes or round tubes, or tubes of other shapes, to ensure that they can be extended up and down. No specific requirements are made for the outer shape here. It is only necessary to ensure that the shape of the second matching part at the top of the small sleeve 6 matches the first matching part of the lifting frame 7 to achieve the purpose of stopping the lifting frame 7. The rotating motor 4 is fixedly arranged in the small sleeve 6. The lifting frame 7 is penetrated in the small sleeve 6. One end of the screw 5 is threadedly connected to the lifting frame 7, and the other end is connected to the output shaft of the rotating motor 4. The rotating motor 4 can also be fixed outside the small sleeve 6. At the same time, a guide part for guiding the lifting frame 7 is arranged outside the small sleeve 6. By preliminarily adjusting the relative positions of the large sleeve 2 and the small sleeve 6, the test piece 17 is roughly adjusted to be able to contact the surface of the sandpaper, and then the test piece 17 is adjusted by the lifting mechanism to be ground within a suitable pressure range.

[0034] In the embodiment of the present scheme, a hanging member 10 is fixedly arranged on the small sleeve 6, the hanging member 10 is arranged horizontally, and is provided with an escape hole for escaping the pressure detection device, one end of the wire 20 is connected to the hanging member 10, and the other end is matched with the clamp mechanism. When the device is initially adjusted, the hanging member 10 and the clamp mechanism can rise or fall with the small sleeve 6, and the test piece 17 can be quickly adjusted to roughly contact the sandpaper surface. The setting of the hanging member 10 shortens the length of the wire 20 and also provides a stable suspension and guide for the clamp mechanism.

[0035] In the embodiment of the present solution, a diagonal brace 21 is provided between the suspended member 10 and the coarse adjustment lifting mechanism to strengthen the fixation.

[0036] In the embodiment of the present solution, a diagonal support rod 22 is provided between the hanging member 10 and the through wire 20 to strengthen the fixation.

Claims

1. A sample grinding device for measuring the spacing between concrete bubbles, characterized by: The invention comprises a base (1), a lifting mechanism, a pressure detection device and a clamping mechanism arranged on the base (1); the lifting mechanism comprises a fixed frame and a lifting frame (7); a rotating motor (4) is fixedly arranged on the fixed frame; a screw rod (5) is fixedly arranged on the output shaft of the rotating motor (4); the screw rod (5) is threadedly connected to the lifting frame (7); one end of the screw rod (5) is connected to the output shaft of the rotating motor (4); the lifting frame (7) and the screw rod (5) form a spiral transmission pair; a first matching portion is arranged on the vertical section of the lifting frame (7); a second matching portion is arranged on the fixed frame; the vertical section of the lifting frame (7) is penetrated by the fixed frame; the first matching portion and the second matching portion cooperate with each other and are used to control the lifting frame (7); 7) performs linear motion in the vertical direction, a pressure detection device is arranged on the lifting frame (7), the pressure detection device is used to detect the pressure applied to the test piece (17), a clamping mechanism is connected below the pressure detection device, the clamping mechanism is used to clamp the test piece (17), at least two wires (20) are vertically arranged below the lifting frame (7), a limit nut (14) is arranged at the lower end of the wire (20), the wire (20) is used to guide the movement of the clamping mechanism, a controller (23) for converting transmission signals and controlling the rotating motor (4) is arranged between the pressure detection device and the rotating motor (4), and the pressure detection device and the rotating motor (4) are respectively electrically connected to the controller (23).

2. The sample grinding device for measuring the spacing between concrete bubbles as claimed in claim 1, characterized in that: The cross section of the vertical section of the lifting frame (7) is square, and a square through hole (24) is arranged on the top of the fixing frame to be gap-matched with the outer peripheral side of the vertical section of the lifting frame (7).

3. The sample grinding device for measuring the spacing between concrete bubbles as claimed in claim 1, characterized in that: The pressure detection device comprises a pressure sensor (9), a sleeve (11), a compression spring (12) and a fixed rod (8); the fixed rod (8) is fixedly arranged on the lifting frame (7); the pressure sensor (9) is fixedly connected to the lower part of the fixed rod (8); one end of the compression spring (12) is connected to the pressure sensor (9) and the other end is connected to the clamp mechanism; the sleeve (11) is arranged vertically; the upper end of the sleeve (11) is fixedly connected to the fixed rod (8) and is sleeved outside the compression spring (12) for guiding the extension and contraction of the compression spring (12).

4. The sample grinding device for measuring the spacing between concrete bubbles as claimed in claim 1, characterized in that: The clamp mechanism comprises a fixing plate (13), an angle steel specimen clamp (15), a locking screw (26) and a locking nut (16); the fixing plate (13) is provided with a guide through hole matched with the through wire (20); a guide groove (25) is provided on the bottom surface of the fixing plate (13); a sliding screw (19) which can slide along the guide groove (25) is provided in the guide groove (25); two left and right angle steel specimen clamps (15) are provided on the bottom surface of the fixing plate (13); a first through hole is provided on the horizontal side surface of the angle steel specimen clamp (15); a threaded end of the sliding screw (19) is inserted into the first through hole. The threaded end is screwed into a nut, and the left and right angle steel test piece clamps (15) slide along the guide groove (25) through the sliding screw (19). A second through hole is opened on the vertical side of the angle steel test piece clamp (15), and a locking screw (26) is inserted into the second through hole. Locking nuts (16) are arranged at both ends of the locking screw (26). The angle steel test piece clamp (15) is clamped to the test piece (17) by tightening the locking nut (16). When the test piece (17) is in a locked state, the angle steel test piece clamp (15) is fixed to the fixed plate (13) by tightening the nut of the sliding screw (19).

5. The sample grinding device for measuring the concrete bubble spacing according to any one of claims 1 to 4, characterized in that: The fixing frame comprises a large sleeve (2), a small sleeve (6) and a positioning pin (3); the small sleeve (6) is sleeved in the large sleeve (2); the large sleeve (2) and the small sleeve (6) are provided with a plurality of vertically arranged positioning holes respectively; the positioning pin (3) is installed in the positioning hole and is used for fixing the large sleeve (2) and the small sleeve (6); the rotating motor (4) is fixedly arranged in the small sleeve (6).

6. The sample grinding device for measuring the distance between concrete bubbles as claimed in claim 5, characterized in that: The small sleeve (6) is fixedly provided with a hanging piece (10), which is arranged horizontally and is provided with an escape hole for escaping the pressure detection device. One end of the wire (20) is connected to the hanging piece (10), and the other end cooperates with the clamp mechanism.

7. The sample grinding device for measuring the distance between concrete bubbles as claimed in claim 6, characterized in that: A diagonal brace (21) is provided between the suspension member (10) and the small sleeve (6).

8. The sample grinding device for measuring the distance between concrete bubbles as claimed in claim 6, characterized in that: An oblique support rod (22) is arranged between the suspension member (10) and the harness (20).

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