Portable concrete slump detector

Abstract

The invention discloses a portable concrete slump detector, and relates to the technical field of concrete detection.The portable concrete slump detector comprises a bottom plate and a slump cylinder, a support is detachably installed on one side of the bottom plate and comprises a liftable measuring rod, and the lower end of the measuring rod is rotationally connected with an annular frame through a bearing; a light beam emitting device used for emitting light beams is fixed to the annular frame, and a plurality of annularly-distributed plane mirrors are fixed to the annular frame. After the slump cylinder is lifted up, concrete in the slump cylinder freely collapses on the bottom plate, light beams of the light beam emitting device are reflected by the multiple plane mirrors to form regular net-shaped turn-back light beams, and the net-shaped turn-back light beams form a light beam surface through the rotating ring frame; the middle ring frame is rotated to be adjusted downwards through the measuring rod, the light beam surface descends from the initial height and irradiates the highest point of the concrete, and the descending height of the measuring rod is obtained; wherein the difference value between the initial height and the descending height is the concrete slump height, and the problem that detection errors occur in traditional slump measurement data is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete detection, and particularly relates to a portable concrete slump detector. Background Art

[0002] During construction, in order to ensure the construction quality, it is necessary to conduct slump detection on concrete. The purpose of the detection is to understand the fluidity and cohesion of the concrete. Currently, when conducting concrete slump detection, the concrete mixture needs to be filled into the slump cone according to the specified method. After scraping the concrete overflowing from the top of the slump cone flat, the slump cone is vertically lifted upward to separate it from the concrete. Subsequently, the slump cone is placed aside. At this time, the concrete mixture will slump due to its own weight. Then, the size of the slump of the concrete mixture is measured with a measuring ruler.

[0003] However, the current measurement method is to observe the highest point of the slump manually. Different positions of the person standing will result in different observation perspectives, which may lead to the problem of being unable to quickly find the highest point, or the measured high point position being lower than the actual height due to improper observation, thus causing measurement deviation. At the same time, when the measuring ruler approaches the high point position of the concrete after slumping, if the worker operates improperly or has a shaky hand, the measuring ruler will press down on the concrete at the high point, resulting in the measured slump data being smaller than the actual data. Summary of the Invention

[0004] The purpose of the present invention is to propose a portable concrete slump detector to solve the problem of detection errors in traditional slump measurement data.

[0005] To achieve the above purpose, the present invention adopts the following technical solution: A portable concrete slump detector includes a bottom plate and a slump cone. One side of the bottom plate is detachably installed with a bracket. The bracket includes a liftable measuring rod. The lower end of the measuring rod is rotatably connected to a ring frame through a bearing. A beam emitting device for emitting a light beam is fixed on the ring frame, and a plurality of annularly distributed plane mirrors are fixed on the ring frame.

[0006] After the slump cone is lifted, the concrete inside freely slumps onto the bottom plate. The light beam of the beam emitting device forms a regular reticular reflected beam after being reflected by a plurality of plane mirrors, and the reticular reflected beam forms a light beam plane after rotating the ring frame.

[0007] During rotation, the ring frame is adjusted downward through the measuring rod, and the light beam plane descends from the starting height and irradiates at the highest point of the concrete, obtaining the descending height of the measuring rod.

[0008] Among them, the difference between the starting height and the descending height is the slump height of the concrete.

[0009] Further description of a portable concrete slump detector of the above technology: An expansion measurement mechanism is slidably inserted on the ring frame. The expansion measurement mechanism includes a plurality of rangefinders. Every two symmetric rangefinders form a group, and every two groups are vertically arranged;

[0010] The light beam of the rangefinder is parallel to the bottom plate, and the light beam is close to but does not touch the upper surface of the bottom plate;

[0011] The width between two symmetric rangefinders is the starting width;

[0012] During rotation, the ring frame drives a plurality of rangefinders to measure the four sides of the concrete after slumping. Each group of rangefinders measures and obtains the measurement width;

[0013] Among them, the expansion width measured by each group of rangefinders is the difference between the starting width and the measurement width.

[0014] Further description of a portable concrete slump detector of the above technology: The light beam emitting device includes an opposed photoelectric switch. The emitter and receiver of the opposed photoelectric switch are obliquely fixed on the ring frame;

[0015] A plurality of first plane mirrors and a second plane mirror are fixed on the ring frame;

[0016] Among them, every two first plane mirrors are symmetrically arranged. The second plane mirror is fixed on the side of the ring frame away from the opposed photoelectric switch and is located between the emitter and the receiver;

[0017] The opposed photoelectric switch is electrically connected to an audible and visual alarm.

[0018] Further description of a portable concrete slump detector of the above technology: The bracket further includes a vertical pipe. One end of the vertical pipe is vertically fixed with a horizontal pipe. The measuring rod is vertically slidably inserted at one end of the horizontal pipe away from the vertical pipe;

[0019] A gear with a hand crank is rotatably connected to the horizontal pipe. A rack meshing with the gear is vertically fixed on one side of the measuring rod. A scale groove is opened from top to bottom on one side of the measuring rod.

[0020] Further description of a portable concrete slump detector of the above technology: The ring frame is fixed with a plurality of sleeves distributed in a ring shape. A support pipe is vertically slidably inserted in the sleeve. A laser rangefinder is fixed at the lower end of the support pipe. A display is fixed on the bracket. A processor is installed in the display;

[0021] Among them, the survey data of the laser rangefinder is processed by the processor and then displayed on the display.

[0022] As a further description of a portable concrete slump detector of the above technology: A wire harness activity port is opened on one side of the support pipe.

[0023] As a further description of a portable concrete slump detector of the above technology: The ring frame is fixedly and rotatably connected to the lower end of the measuring rod through a fixing frame. A slip ring is fixed to the lower end of the measuring rod. The stator of the slip ring is fixed to the lower end of the measuring rod, and the rotor is fixed on the fixing frame and is coaxially arranged with the ring frame. A storage battery is fixed on the support.

[0024] As a further description of a portable concrete slump detector of the above technology: The bottom plate is fixed with an outer ring plate through a plurality of annularly distributed connecting rods. A separation port is reserved between the outer ring plate and the bottom plate;

[0025] A positioning rod adapted to the lower end of the vertical pipe is fixed on one side of the outer ring plate.

[0026] As a further description of a portable concrete slump detector of the above technology: A collection box with an open top is coaxially fixed to the large-diameter end of the slump cone.

[0027] As a further description of a portable concrete slump detector of the above technology: The bottom plate is provided with a positioning loop line that coincides with the outer edge of the collection box.

[0028] In summary, due to adopting a portable concrete slump detector of the above technology, the beneficial effects of the present invention are:

[0029] 1. The light beam is reflected by multiple plane mirrors, and a light beam surface is formed through the rotation of the ring frame. The measuring rod drives the ring frame to descend, so that the light beam irradiates the highest point of the slumped concrete, thereby quickly determining the position of the highest point. Through a non-contact measurement method with the concrete, it is avoided that the surveyor accidentally presses the concrete with a measuring ruler, thus realizing the rapid and accurate measurement of the slump height of the slumped concrete, and the overall structure is more simple to operate.

[0030] 2. Through the linkage of the rangefinder and the ring frame, when the ring frame rotates, it drives multiple rangefinders to rotate around the light beam center point, measures the distance around the slumped concrete, and then can quickly find out the maximum expansion width and the expansion width data perpendicular to it after the concrete slumps, and finally realizes the rapid and accurate synchronous measurement of the concrete spread. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Shows the overall structural schematic diagram provided by the embodiment of the present invention;

[0032] Figure 2 Shows the structural schematic diagram of the light beam emitting device and the support provided by the embodiment of the present invention;

[0033] Figure 3 Shows a schematic diagram of a partial cross-sectional structure provided according to an embodiment of the present invention;

[0034] Figure 4 Shows a schematic diagram of a bottom plate structure provided according to an embodiment of the present invention;

[0035] Figure 5 Shows a schematic diagram of a slump cone structure provided according to an embodiment of the present invention;

[0036] Figure 6 Shows a schematic diagram of an expansion measurement mechanism structure provided according to an embodiment of the present invention;

[0037] Figure 7 Shows a schematic diagram of the Figure 6 magnified structure at position A provided according to an embodiment of the present invention;

[0038] Figure 8 Shows a schematic diagram of the beam reflection path structure of an opposed photoelectric switch provided according to an embodiment of the present invention;

[0039] Figure 9 Shows a schematic diagram of the concrete slump measurement state provided according to an embodiment of the present invention;

[0040] Figure 10 Shows a schematic diagram of the concrete expansion measurement state provided according to an embodiment of the present invention.

[0041] Legend:

[0042] 10. Bottom plate; 11. Positioning loop; 12. Outer ring plate; 121. Positioning rod; 13. Connecting rod; 14. Isolation port;

[0043] 20. Slump cone; 21. Collection box;

[0044] 30. Bracket; 31. Vertical pipe; 32. Horizontal pipe; 33. Measuring rod; 331. Scale groove; 34. Tooth plate; 35. Gear;

[0045] 40. Ring frame; 41. Fixed frame; 42. Wire pipe; 43. Sleeve;

[0046] 50. Beam emission device; 51. Opposed photoelectric switch; 511. Transmitter; 512. Receiver; 52. First plane mirror; 53. Second plane mirror; 54. Electric slip ring; 55. Storage battery; 56. Acousto-optic alarm;

[0047] 60. Expansion measurement mechanism; 61. Laser rangefinder; 62. Display; 63. Support pipe; 631. Wire harness movable port; 64. Wire; Detailed implementation manners

[0048] The following will clearly and completely describe a portable concrete slump detector in the technical solutions of the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0049] As Figure 1 - Figure 10 shown, the present invention provides a portable concrete slump detector, which includes a bottom plate 10 and a slump cone 20. A bracket 30 is detachably installed on one side of the bottom plate 10 to facilitate the overall carrying through the disassembly of the bracket 30 from the bottom plate 10. The bracket 30 includes a liftable measuring rod 33. The lower end of the measuring rod 33 is rotatably connected to a ring frame 40 through a bearing. A beam emitting device 50 for emitting a light beam is fixed on the ring frame 40. A plurality of annularly distributed plane mirrors are fixed on the ring frame 40, and the plurality of plane mirrors are used to reflect the light beam emitted by the beam emitting device 50.

[0050] The light beam of the beam emitting device 50 is reflected by a plurality of plane mirrors to form a regular reticular folded-back light beam. The axis of the ring frame 40 coincides with the intersection point of the light beam centers, that is, the reticular folded-back light beam rotates around the intersection point of the light beam centers, so that the reticular folded-back light beam forms a light beam surface without dead angles through the rotation of the ring frame 40.

[0051] After the slump cone 20 is lifted and the concrete inside freely collapses onto the bottom plate 10, the middle ring frame 40 is adjusted downward through the measuring rod 33. The light beam surface descends from the starting height (i.e., the position where the light beam is coplanar with the upper end of the slump cone 20) and irradiates on the highest point of the concrete, and then the descending height of the measuring rod 33 can be obtained.

[0052] Finally, the difference between the starting height and the descending height is the slump height of the concrete.

[0053] The light beam is reflected by a plurality of plane mirrors, and a light beam surface is formed through the rotation of the ring frame 40. The measuring rod 33 drives the ring frame 40 to descend, so that the light beam irradiates on the highest point of the collapsed concrete, thereby quickly determining the position of the highest point. Through a non-contact measurement method with the concrete, it avoids the surveyor from accidentally pressing the concrete, thus realizing the rapid and accurate measurement of the slump height of the concrete, and the overall structure is more simple to operate.

[0054] As Figure 1 、 Figure 9 、 Figure 10 shown, an expansion measurement mechanism 60 is slidably inserted on the ring frame 40. The expansion measurement mechanism 60 includes a plurality of annularly distributed rangefinders. Among them, every two symmetric rangefinders are a group, and every two groups are vertically arranged.

[0055] The beam of the rangefinder is parallel to the bottom plate 10, and the beam is close to but does not touch the upper surface of the bottom plate 10 to prevent the beam of the rangefinder from irradiating on the bottom plate 10 and affecting the accuracy of the measurement data;

[0056] The width between two symmetric rangefinders is the starting width, and the number of the starting width is "W";

[0057] Rotate the middle ring frame 40 to drive multiple rangefinders to measure the distances around the concrete after it collapses. The measured values of the multiple rangefinders are numbered d1, d11, d2, and d22 respectively. Among them, d1 and d11 are rangefinders at both ends of the same diameter line, that is, the light rays of the two groups of sensors coincide and are in opposite directions. d2 and d22 are also arranged in the same way and are perpendicular to the diameter line direction of d1 and d11. By subtracting the sum of the measured values of the two groups of rangefinders from the starting width W of the two opposite groups of rangefinders, the concrete expansion width value is obtained. The formula is: expansion width = W - (d1 + d11), then the vertical expansion width = W - (d2 + d22); among them, when the difference between the starting width W and the measured widths d1 and d11 is the largest, it is the maximum expansion width after the concrete collapses; at this time, the difference between the starting width W and the measured widths d2 and d22 is the expansion width in the vertical direction of the maximum expansion width;

[0058] Taking the measurement data of two groups of vertically arranged rangefinders as a set, if the difference between the maximum expansion width and its vertical expansion width is ≤ 50 mm, it is valid data. On the contrary, if it is > 50 mm, it is invalid data, and the measurement of the concrete expansion degree this time is invalid. It is necessary to refill the concrete into the slump cone 20 and let it collapse freely again until the difference between the maximum expansion width and its vertical expansion width is ≤ 50 mm. Finally, the average value of the maximum expansion width and its vertical expansion width values is the final expansion width.

[0059] The expansion width measured by each group of rangefinders is the difference between the starting width and the measured width. And through the rotating rangefinders, the distances around the collapsed concrete can be measured in a circular manner, and thus the maximum diameter of the collapsed concrete can be found quickly and accurately.

[0060] Through the linkage between the rangefinder and the ring frame 40, when the ring frame 40 rotates, it drives multiple rangefinders to rotate around the beam center point to measure the distances around the collapsed concrete, and thus the maximum expansion width and its vertical expansion width data of the collapsed concrete can be found quickly. Finally, the measurement of the concrete expansion degree is completed quickly and accurately synchronously.

[0061] As Figure 2 、 Figure 8 shown, the beam emission device 50 includes an opposed photoelectric switch 51, and the emitter 511 and the receiver 512 of the opposed photoelectric switch 51 are inclined and fixed on the ring frame 40;

[0062] A plurality of first plane mirrors 52 and a second plane mirror 53 are fixed on the ring frame 40;

[0063] Among them, every two first plane mirrors 52 are symmetrically arranged. The second plane mirror 53 is fixed on the side of the ring frame 40 away from the opposed photoelectric switch 51 and is located between the emitter 511 and the receiver 512. When the light beam emitted by the emitter 511 is reflected successively from R1 - R7 by the first plane mirror 52, and then reflected by the second plane mirror 53, the light beam is reflected successively through R8 - R14, and finally reflected by R14 to the receiver 512;

[0064] The opposed photoelectric switch 51 is electrically connected to an audible and visual alarm 56. When an object blocks the light beam of the opposed photoelectric switch 51, when the light beam of the opposed photoelectric switch 51 is blocked, its receiver 512 converts the interruption of the optical signal into a jump of the electrical signal. After amplification, filtering, and threshold judgment to eliminate interference, a switching quantity signal is output to the control end of the audible and visual alarm 56 or triggered by PLC / single-chip microcomputer programming, and the buzzer immediately sounds and the LED flashes for alarm, so as to quickly judge the height position of the concrete after collapse.

[0065] As Figure 2 、 Figure 3 shown, the bracket 30 further includes a riser pipe 31. A horizontal pipe 32 is vertically fixed at the upper end of the riser pipe 31. The measuring rod 33 is vertically inserted and slid in the end of the horizontal pipe 32 away from the riser pipe 31;

[0066] A gear 35 with a handwheel is rotatably connected to the horizontal pipe 32 by an axis. A toothed plate 34 meshing with the gear 35 is vertically fixed on one side of the measuring rod 33. A scale groove 331 is opened vertically from top to bottom on one side of the measuring rod 33. By rotating the handwheel to drive the gear 35 to rotate, under the meshing action of the gear 35 and the toothed plate 34, the measuring rod 33 is vertically lifted and adjusted. At the same time, by observing the change of the scale value of the scale groove 331, the descending height of the measuring rod 33 can be quickly obtained.

[0067] As Figure 1 、 Figure 2 shown, the ring frame 40 is fixed with a plurality of square sleeves 43 distributed annularly. A square support pipe 63 is vertically inserted and slid in the sleeve 43. A laser rangefinder 61 is fixed at the lower end of the support pipe 63. A display 62 is fixed on the bracket 30, and a processor is installed in the display 62;

[0068] Among them, the surveying data of the laser rangefinder 61 is processed by the processor and then displayed on the display 62;

[0069] The beam of the laser rangefinder 61 irradiates along the horizontal direction, and through the sliding adjustment of the support tube 63 in the sleeve 43, when the ring frame 40 drives the support tube 63 to rotate, it can also ensure the normal descent of the ring frame 40. In this embodiment, there are four sleeves 43, and every two groups are symmetrically arranged. Therefore, every two symmetric laser rangefinders 61 are vertically arranged for measuring the measurement width d in two vertical directions;

[0070] After the laser rangefinder 61 emits a laser beam and receives the target reflection signal, and measures the distance data in real time, the analog signal is converted into a digital signal by the built-in analog-to-digital conversion module, and is transmitted to the processor through the serial port or wireless communication for denoising filtering, error calibration and data format standardization processing. Finally, the processed distance value (such as three-dimensional coordinates, dynamic waveform or numerical interface) is output to the display 62 in real time through the HDMI or LVDS interface.

[0071] As Figure 6 、 Figure 7 As shown, a wire harness moving port 631 is opened on one side of the support tube 63, and the wire 64 of the laser rangefinder 61 penetrates into the support tube 63, and the part placed in the support tube 63 is a spring wire. Therefore, when the ring frame 40 moves up and down, the wire 64 inside the support tube 63 expands and contracts, and the wire 64 moves along the wire harness moving port 631 to prevent the wire 64 from jamming the up and down movement of the ring frame 40.

[0072] As Figure 3 As shown, the ring frame 40 is fixedly and rotatably connected to the lower end of the measuring rod 33 through the fixing frame 41. A slip ring 54 is fixed to the lower end of the measuring rod 33. The stator of the slip ring 54 is fixed to the lower end of the measuring rod 33, and the rotor is fixed to the fixing frame 41 and is coaxially arranged with the ring frame 40. A storage battery 55 is fixed on the support 30.

[0073] The storage battery 55 is installed in the horizontal tube 32 to supply power to the display 62, the laser rangefinder 61, and the opposed photoelectric switch 51, which is convenient for carrying and using. At the same time, the cooperation of the slip ring 54 solves the problem of wire 64 winding when the ring frame 40 rotates.

[0074] At the same time, a wire tube 42 is fixed on the fixing frame 41 above the opposed photoelectric switch 51, and the wire 64 penetrates into the wire tube 42 to prevent the scattered wire 64 from falling into the ring frame 40 and causing misoperation of the opposed photoelectric switch 51.

[0075] As Figure 4 As shown, the bottom plate 10 is fixed with an outer ring plate 12 through a plurality of annularly distributed connecting rods 13, and an isolation port 14 is reserved between the outer ring plate 12 and the bottom plate 10;

[0076] The laser rangefinder 61 is mounted on the outer ring plate 12. Therefore, when measuring the slump of concrete, the concrete spreads to the outer edge of the bottom plate 10 and is isolated through the isolation port 14 at the outer edge to prevent the overflowing concrete from contaminating the outer ring plate 12 and affecting the normal rotation of the laser rangefinder 61. In addition, a plurality of annularly distributed adjusting feet are threadedly connected to the bottom of the outer ring plate 12 to facilitate the adjustment of the flatness of the bottom plate 10;

[0077] As Figure 4 shown, a positioning rod 121 adapted to the lower end of the riser pipe 31 is fixed on one side of the outer ring plate 12. By inserting and removing the riser pipe 31 from the positioning rod 121, it is convenient for the quick disassembly and assembly of the bracket 30 and the bottom plate 10. At the same time, the riser pipe 31 can be fixed on the positioning rod 121 through the bolts at the lower end of the riser pipe 31.

[0078] As Figure 4 shown, a collection box 21 with an open top is coaxially fixed to the large-diameter end (lower end) of the slump cone 20. When adding concrete into the slump cone 20 and scraping off the excess concrete with a scraper, the concrete flows into the collection box 21 along the slump cone 20, thereby ensuring that the bottom plate 10 around the bottom is in a clean state when the slump cone 20 is lifted upward and avoiding the problem of secondary cleaning of the scraped concrete.

[0079] As Figure 4 shown, a positioning loop 11 that coincides with the outer edge of the collection box 21 is provided on the bottom plate 10 to facilitate the positioning of the slump cone 20, so that the intersection of the axis of the slump cone 20 and the beam center is on the same axis, thereby enabling the slump cone 20 to be centered and avoiding the concrete from falling from one side edge of the bottom plate 10 due to excessive position offset during slump.

[0080] Working principle: Remove the bracket 30 from the positioning rod 121, align the outer edge of the collection box 21 with the positioning loop 11, then pour the concrete into the slump cone 20 and vibrate it with a vibrating rod. Then scrape off the excess concrete with a scraper. Rotate the handwheel to make the measuring rod 33 move upward. When it can no longer move upward, after assembling the riser pipe 31 onto the positioning rod 121, the beam of the emitter 511 and the upper end of the slump cone 20 are in a coplanar state. At this time, the scale groove 331 corresponding to the upper edge of the horizontal pipe 32 is the starting height. Then rotate the ring frame 40 and rotate the handwheel so that the ring frame 40 rotates and descends. When the beam of the emitter 511 is blocked by the concrete, the sound and light alarm 56 operates. Read the value corresponding to the upper edge of the horizontal pipe 32 of the scale groove 331 to obtain the measured height. Then subtract the measured height from the starting height value to obtain the slump height;

[0081] Meanwhile, the rotating laser rangefinder 61 measures the distance around the collapsed concrete, and measures the measurement widths at multiple positions around the collapsed concrete through the laser rangefinder 61. By subtracting the measurement width from the original width, the expansion width can be obtained.

[0082] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent replacements or changes, and should be covered within the protection scope of the present invention.

Claims

1. A portable concrete slump detector, characterized in that, It includes a bottom plate (10) and a slump cone (20). A bracket (30) is detachably installed on one side of the bottom plate (10). The bracket (30) includes a liftable measuring rod (33). The lower end of the measuring rod (33) is rotatably connected to a ring frame (40) through a bearing. A beam emitting device (50) for emitting a light beam is fixed on the ring frame (40). A plurality of annularly distributed plane mirrors are fixed on the ring frame (40). After the slump cone (20) is lifted, the concrete inside freely collapses onto the bottom plate (10). The light beam of the beam emitting device (50) is reflected by a plurality of plane mirrors to form a regular reticular refolded light beam. The reticular refolded light beam forms a light beam surface through the rotating ring frame (40). During rotation, the ring frame (40) is adjusted downward through the measuring rod (33). The light beam surface descends from the starting height and irradiates at the highest point of the concrete, obtaining the descending height of the measuring rod (33). Among them, the difference between the starting height and the descending height is the slump height of the concrete.

2. The portable concrete slump detector according to claim 1, characterized in that, An expansion measurement mechanism (60) is slidably inserted on the ring frame (40). The expansion measurement mechanism (60) includes a plurality of rangefinders. Every two symmetric rangefinders form a group, and every two groups are vertically arranged. The light beams of the rangefinders are parallel to the bottom plate (10), and the light beams are close to but do not touch the upper surface of the bottom plate (10). The width between two symmetric rangefinders is the starting width. During rotation, the ring frame (40) drives a plurality of rangefinders to measure the distances around the concrete after collapse. Each group of rangefinders measures and obtains a measured width. Among them, the expansion width measured by each group of rangefinders is the difference between the starting width and the measured width.

3. The portable concrete slump detector according to claim 1, characterized in that, The beam emitting device (50) includes a through-beam photoelectric switch (51). The emitter (511) and the receiver (512) of the through-beam photoelectric switch (51) are obliquely fixed on the ring frame (40). A plurality of first plane mirrors (52) and a second plane mirror (53) are fixed on the ring frame (40). Among them, every two first plane mirrors (52) are symmetrically arranged. The second plane mirror (53) is fixed on the side of the ring frame (40) away from the through-beam photoelectric switch (51) and is located between the emitter (511) and the receiver (512). The through-beam photoelectric switch (51) is electrically connected to an audible and visual alarm (56).

4. A portable concrete slump detector according to claim 1, characterized in that, The bracket (30) further includes a riser pipe (31). One end of the riser pipe (31) is vertically fixed with a cross pipe (32). The measuring rod (33) is vertically slidably inserted into the end of the cross pipe (32) away from the riser pipe (31). A gear (35) with a handwheel is rotatably connected to the cross pipe (32). A toothed plate (34) meshing with the gear (35) is vertically fixed on one side of the measuring rod (33). A scale groove (331) is opened on one side of the measuring rod (33) from top to bottom.

5. A portable concrete slump detector according to claim 1, characterized in that, A plurality of annularly distributed sleeves (43) are fixed on the ring frame (40). A support pipe (63) is vertically slidably inserted into the sleeve (43). A laser rangefinder (61) is fixed at the lower end of the support pipe (63). A display (62) is fixed on the bracket (30). A processor is installed in the display (62). Among them, the surveying data of the laser rangefinder (61) is processed by a processor and then displayed on the display (62).

6. The portable concrete slump detector according to claim 5, characterized in that, One side of the support pipe (63) is provided with a wire harness movable opening (631).

7. A portable concrete slump detector according to claim 1, characterized in that, The ring frame (40) is fixedly and rotatably connected to the lower end of the measuring rod (33) through a fixing frame (41). An electric slip ring (54) is fixed to the lower end of the measuring rod (33). The stator of the electric slip ring (54) is fixed to the lower end of the measuring rod (33), and the rotor is fixed on the fixing frame (41) and is coaxially arranged with the ring frame (40). A storage battery (55) is fixed on the support (30).

8. A portable concrete slump detector according to claim 4, characterized in that, The bottom plate (10) is fixed with an outer ring plate (12) through a plurality of annularly distributed connecting rods (13). A separation opening (14) is reserved between the outer ring plate (12) and the bottom plate (10); One side of the outer ring plate (12) is fixed with a positioning rod (121) adapted to the lower end of the riser pipe (31).

9. The portable concrete slump detector according to claim 1, characterized in that, The large-diameter end of the slump cone (20) is coaxially fixed with a collection box (21) with an open top.

10. A portable concrete slump detector according to claim 1, characterized in that, The bottom plate (10) is provided with a positioning loop line (11) that coincides with the outer edge of the collection box (21).

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