A laboratory UHPC mixing device with a guarded conductivity probe

Abstract

The utility model provides a kind of laboratory UHPC stirring device with protective conductivity probe, including stirring tank, tank cover, stirrer, probe protection structure and conductivity probe;Probe protection structure includes mounting seat and the protective cover of being arranged in the lower end of mounting seat;Mounting seat and protective cover are cylindrical structure;Probe holding element is equipped in the inner wall of protective cover, multiple flow guide holes are arranged in the middle lower part and bottom of the side wall of protective cover, multiple air holes are arranged in the upper part of side wall, the aperture of flow guide hole and air hole is less than aggregate particle diameter;Conductivity probe is inserted in protective cover and is fixed by probe holding element, the wire of conductivity probe extends to outside and is connected with host computer by passing through mounting seat;Tank cover is equipped with mounting through-hole, and mounting seat is detachably mounted at mounting through-hole.The UHPC stirring device evaluates the dispersion of cement paste or mortar by the change of conductivity, which is fast and convenient, and can effectively protect the conductivity probe, so that it can work stably and be easily disassembled and maintained.

Description

Technical Field

[0001] This utility model belongs to the technical field of building material experimental equipment, and in particular relates to a laboratory UHPC stirring device with a protective conductivity probe. Background Technology

[0002] Ultra-high performance concrete (UHPC) is widely used due to its excellent mechanical properties and durability. However, the extremely low water-cement ratio of UHPC mixtures makes it difficult for cement particles to disperse quickly and sufficiently in the initial stages of mixing. Traditional evaluation methods, such as visual inspection or cross-sectional cone flowability testing, are cumbersome and difficult to accurately and quantitatively determine the dispersion uniformity. This results in large dispersions in the mechanical strength values ​​of UHPC specimens prepared in the laboratory, seriously affecting experimental efficiency and the accuracy of results.

[0003] To address this issue, conductivity probes can be used to monitor changes in the conductivity of cement paste or mortar during the mixing process. The conductivity curve can be used to accurately determine the optimal time for dispersion. However, UHPC mixtures are subjected to strong mixing forces inside the mixer, and the materials contain aggregate particles. The conductivity probes are subjected to such harsh working conditions for a long time, making them highly susceptible to damage from impacts, leading to inaccurate measurements and shortened equipment lifespan. Utility Model Content

[0004] In view of this, in order to solve the above-mentioned technical problems, this utility model proposes a laboratory UHPC mixing device with a protective conductivity probe. By setting a conductivity probe, the conductivity change of cement paste or mortar is tested, and the dispersion of cement paste or mortar is evaluated by the change in conductivity. It is fast and convenient. At the same time, the reasonable structural design can effectively protect the conductivity probe, so that it can work stably in the UHPC mixture and is easy to disassemble and maintain.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A laboratory UHPC stirring device with a protective conductivity probe includes a stirring tank, a tank cover on top of the stirring tank, a stirrer for stirring materials inside the stirring tank, a probe protection structure, and a conductivity probe. The probe protection structure includes a mounting base and a detachable protective cover mounted on the lower end of the mounting base. Both the mounting base and the protective cover are cylindrical structures. A probe holder is provided on the upper end of the inner wall of the protective cover. Multiple flow guide holes are provided in the lower middle and bottom parts of the side wall of the protective cover, and multiple air holes are provided in the upper part of the side wall of the protective cover. The diameter of the flow guide holes and the air holes is smaller than the diameter of the aggregate particles. The conductivity probe is vertically inserted into the protective cover and detachably fixed by the probe holder. The wire of the conductivity probe extends through the inner cavity of the mounting base to the outside and connects to the main unit. The tank cover has a mounting through hole, and the mounting base is detachably mounted at the mounting through hole.

[0007] Furthermore, the upper end face of the tank cover is symmetrically provided with threaded columns outside the mounting through hole; the top of the mounting base is provided with a flange, which is inserted into the threaded column and fixed to the threaded column by an upper positioning nut and a lower positioning nut; by adjusting the position of the flange on the threaded column, the depth of the mounting base extending into the mixing tank can be adjusted to adapt to the monitoring of different liquid levels. The height adjustment is based on the fact that most of the air holes are above the liquid level and most of the guide holes are below the liquid level.

[0008] Furthermore, the bottom of the mounting base is provided with a protective cover through hole, and the lower end of the inner wall of the mounting base is provided with an internal thread; the upper end of the protective cover is installed in the protective cover through hole, and the top of the protective cover is provided with a horizontally outwardly extending edge, and the outer side wall of the edge is provided with an external thread that matches the internal thread at the lower end of the inner wall of the mounting base; the protective cover and the mounting base are detachably connected by threads.

[0009] Furthermore, the bottom of the protective cover has a downward-convex arc-shaped structure.

[0010] Furthermore, the probe clamping component includes a protruding ring arranged circumferentially on the inner wall of the protective cover and an alkali-resistant elastic rubber sleeve sleeved on the surface of the protruding ring; the inner diameter of the alkali-resistant elastic rubber sleeve is smaller than the outer diameter of the rod of the conductivity probe, and the conductivity probe is inserted into the alkali-resistant elastic rubber sleeve and fixed by the elastic clamping of the alkali-resistant elastic rubber sleeve.

[0011] Furthermore, there are two probe holders, spaced apart vertically.

[0012] Furthermore, the opening ratio of the guide hole is greater than that of the air hole, and the opening area of ​​the guide hole accounts for 15%-30% of the total area of ​​the protective cover.

[0013] Compared with existing technologies, the laboratory UHPC stirring device with a protective conductivity probe described in this utility model has the following advantages:

[0014] (1) The laboratory UHPC mixing device with protective conductivity probe described in this utility model uses conductivity probe to test the conductivity change of cement paste or mortar, and evaluates the dispersion of cement paste or mortar by the change of conductivity, which replaces the tedious work of manually testing cement paste or mortar with cross-section cone, and is fast and convenient.

[0015] (2) The laboratory UHPC stirring device with protective conductivity probe described in this utility model isolates the conductivity probe from the main stirring body flow by setting a probe protection structure, which effectively avoids direct impact of materials and direct impact of hard aggregates on the probe, reduces wear, and significantly improves the service life of the conductivity probe; the detachable connection design makes it easier to clean, calibrate and replace the conductivity probe and the probe protection structure, and facilitates maintenance.

[0016] (3) The guide hole design on the protective cover of the laboratory UHPC stirring device with protective conductivity probe described in this utility model ensures that the fresh slurry can flow continuously and stably through the probe measurement area, so that the conductivity measurement value can truly reflect the state of the overall mixture without being significantly interfered with by the protective cover. At the same time, air holes are provided to facilitate the discharge of internal air bubbles.

[0017] (4) The laboratory UHPC stirring device with protective conductivity probe described in this utility model can adjust the depth of the mounting base extending into the stirring tank by adjusting the position of the flange on the threaded column, and can adapt to the monitoring of different liquid levels within a certain range. Attached Figure Description

[0018] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0019] Figure 1 This is a schematic diagram of the internal structure of the laboratory UHPC stirring device with a protective conductivity probe as described in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the probe protection structure and the internal structure of the conductivity probe described in the embodiment of this utility model;

[0021] Figure 3 This is a schematic diagram of the external structure of the probe protection structure and the conductivity probe described in the embodiment of this utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1-Mixing tank, 2-Tank cover, 3-Agitator, 4-Probe protection structure, 5-Conductivity probe, 6-Mounting through hole, 7-Threaded column, 8-Mounting base, 9-Protective cover, 10-Flange, 11-Upper positioning nut, 12-Lower positioning nut, 13-Edge, 14-Guide hole, 15-Air hole, 16-Probe clamp, 17-Protruding ring, 18-Alkali-resistant elastic rubber sleeve, 19-Wire. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0025] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] like Figures 1 to 3 As shown, a laboratory UHPC stirring device with a protective conductivity probe includes a stirring tank 1, a tank cover 2 on top of the stirring tank 1, a stirrer 3 for stirring the materials inside the stirring tank 1, a probe protection structure 4, and a conductivity probe 5.

[0029] The can lid 2 is provided with a mounting through hole 6, and threaded columns 7 are symmetrically provided on the upper end face of the can lid 2 outside the mounting through hole 6;

[0030] The probe protection structure 4 includes a mounting base 8 and a detachable protective cover 9 installed at the lower end of the mounting base 8; both the mounting base 8 and the protective cover 9 are cylindrical structures.

[0031] Mounting base 8 is detachably installed at mounting through hole 6. Mounting base 8 has a flange 10 on top, which is inserted into threaded column 7 and fixed to threaded column 7 by upper positioning nut 11 and lower positioning nut 12. Mounting base 8 has a protective cover through hole at bottom and internal thread at the lower end of inner wall of mounting base 8.

[0032] The upper end of the protective cover 9 is installed in the through hole of the protective cover. The top of the protective cover 9 is provided with a horizontally outward extending edge 13. The outer side wall of the edge 13 is provided with an external thread that matches the internal thread of the lower end of the inner wall of the mounting base 8. The protective cover 9 and the mounting base 8 are detachably connected by the thread. The bottom of the protective cover 9 is a downwardly convex arc structure. Multiple guide holes 14 are opened in the lower middle part and bottom of the side wall of the protective cover 9. Multiple air holes 15 are opened in the upper part of the side wall of the protective cover 9. The diameter of the guide holes 14 and the air holes 15 is smaller than the diameter of the aggregate particles. The opening ratio of the guide holes 14 is greater than the opening ratio of the air holes 15. The area accounts for 15%-30% of the total area of ​​the protective cover 9; the upper end of the inner wall of the protective cover 9 is provided with a probe clamp 16, which includes a protruding ring 17 arranged circumferentially on the inner wall of the protective cover 9 and an alkali-resistant elastic rubber sleeve 18 sleeved on the surface of the protruding ring 17; the inner diameter of the alkali-resistant elastic rubber sleeve 18 is smaller than the outer diameter of the rod of the conductivity probe 5, the conductivity probe 5 is vertically inserted into the alkali-resistant elastic rubber sleeve 18 and fixed by the elastic clamping of the alkali-resistant elastic rubber sleeve 18, and the wire 19 of the conductivity probe 5 passes through the inner cavity of the mounting base 8 and extends to the outside to connect with the main unit; there are two probe clamps 16, which are arranged at intervals.

[0033] The working process of the laboratory UHPC stirring device with protective conductivity probe described in this utility model is as follows:

[0034] Insert the conductivity probe 5 into the protective cover 9 and fix it with the probe holder 16; place the protective cover 9 with the conductivity probe 5 inserted into the mounting base 8 from the top of the mounting base 8, with the lower end of the protective cover 9 passing through the protective cover through hole and the edge 13 reaching the thread. Rotate the protective cover 9 to fix it to the mounting base 8 by means of threaded connection; insert the assembled probe protection structure 4 with conductivity probe 5 into the mounting through hole 6 of the tank cover 2; insert the flange 10 into the threaded column 7, adjust the position of the flange 10 on the threaded column 7 to a suitable height, and then tighten the upper positioning nut 11 and the lower positioning nut 12 at the upper and lower ends of the flange 10 to fix the position of the mounting base 8; during the stirring process, the UHPC slurry continuously flows into and out of the protective cover 9 through the guide hole 14 under the action of stirring, and fully contacts the measuring end of the conductivity probe 5, thereby detecting the conductivity of the slurry, and transmitting it to the external host through the wire 19.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A laboratory UHPC stirring device with a protective conductivity probe, comprising a stirring tank, a tank cover disposed on top of the stirring tank, and a stirrer for stirring materials inside the stirring tank, characterized in that: It also includes a probe protection structure and a conductivity probe; the probe protection structure includes a mounting base and a detachable protective cover installed at the lower end of the mounting base; both the mounting base and the protective cover are cylindrical structures; the upper end of the inner wall of the protective cover is provided with a probe clamping component, and multiple flow guide holes are opened in the lower middle part and bottom of the side wall of the protective cover, and multiple air holes are opened in the upper part of the side wall of the protective cover. The diameter of the flow guide holes and the air holes is smaller than the diameter of the aggregate particles; the conductivity probe is vertically inserted into the protective cover and is detachably fixed by the probe clamping component, and the wire of the conductivity probe extends through the inner cavity of the mounting base to the outside and connects to the main unit; the tank cover is provided with a mounting through hole, and the mounting base is detachably installed at the mounting through hole.

2. The laboratory UHPC stirring device with a protective conductivity probe according to claim 1, characterized in that: The upper end face of the can cover is symmetrically provided with threaded columns located outside the mounting through hole; the top of the mounting base is provided with a flange, which is inserted through the threaded columns and fixed to the threaded columns by an upper positioning nut and a lower positioning nut.

3. The laboratory UHPC stirring device with a protective conductivity probe according to claim 1, characterized in that: The bottom of the mounting base is provided with a protective cover through hole, and the lower end of the inner wall of the mounting base is provided with an internal thread; the upper end of the protective cover is installed in the protective cover through hole, and the top of the protective cover is provided with a horizontally outwardly extending edge, and the outer side wall of the edge is provided with an external thread that matches the internal thread at the lower end of the inner wall of the mounting base; the protective cover and the mounting base are detachably connected by threads.

4. The laboratory UHPC stirring device with a protective conductivity probe according to claim 1, characterized in that: The bottom of the protective cover has a downward-convex arc-shaped structure.

5. The laboratory UHPC stirring device with a protective conductivity probe according to claim 1, characterized in that: The probe clamping component includes a protruding ring arranged circumferentially on the inner wall of the protective cover and an alkali-resistant elastic rubber sleeve sleeved on the surface of the protruding ring; the inner diameter of the alkali-resistant elastic rubber sleeve is smaller than the outer diameter of the rod of the conductivity probe, and the conductivity probe is inserted into the alkali-resistant elastic rubber sleeve and fixed by the elastic clamping of the alkali-resistant elastic rubber sleeve.

6. The laboratory UHPC stirring device with a protective conductivity probe according to claim 5, characterized in that: There are two probe holders, spaced apart vertically.

7. The laboratory UHPC stirring device with a protective conductivity probe according to claim 1, characterized in that: The opening ratio of the guide hole is greater than that of the air hole, and the opening area of ​​the guide hole accounts for 15%-30% of the total area of ​​the protective cover.

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