A positioning fixture special for drilling a sample from the center of a combustion test piece

Abstract

The utility model discloses a kind of special positioning clamps of burning test piece core sampling. Special positioning clamp of burning test piece core sampling, comprising: shell and the clamping piece being installed in shell interior;The shell includes shell body, the shell body is enclosed around, upper end opening is equipped with cover plate, the shell body one side installs filter screen, the filter screen one side is equipped with fan;The clamping piece includes a pair of clamping plate, the clamping plate is slidably installed in shell body, and the clamping plate is driven by drive assembly;Limiting hole is equipped on the cover plate, and the limiting hole is located above two clamping plates. The special positioning clamp of burning test piece core sampling provided by the utility model realizes the interception effect of dust in sampling process by setting filter screen, to reduce dust into air inhaled into body by staff, protect the health of staff and environmental sanitation.

Description

Technical Field

[0001] This utility model relates to the field of experimental equipment technology, and in particular to a special positioning clamp for core sampling of burning specimens. Background Technology

[0002] Fire-resistant concrete is a type of concrete material coated with a fire-retardant coating to improve the fire resistance of concrete structures. Fire-retardant coatings enhance fire resistance by reducing the speed of flame propagation and delaying the time it takes for concrete components to reach their maximum temperature. Fire-resistant concrete is mainly divided into two types: non-intumescent and intumescent. Non-intumescent fire-retardant coatings produce a glassy enamel when heated, isolating air and heat, but their insulation performance is limited. Intumescent fire-retardant coatings form a sponge-like foam insulation layer at high temperatures, providing significant insulation. Fire-resistant concrete is widely used in bridges, buildings, and other fields, especially in fires, effectively preventing concrete cracking and strength reduction, ensuring structural safety. Studies have shown that the strength of concrete gradually decreases at high temperatures, while fire-resistant concrete, through its unique fire-retardant mechanism, can significantly improve the fire resistance of structures and reduce losses caused by fires.

[0003] Existing technology provides a special positioning fixture for core sampling of combustion specimens, including a fixed base plate, on both sides of which are fixedly installed a first fixed plate and a second fixed plate. A sliding groove is formed on the top side of the fixed base plate, within which a slider is slidably installed. A through hole is formed on one side of the first fixed plate, and a fixing nut is fixedly installed on one side of the through hole, through which a screw is screwed. A clamping plate is installed at the top of the fixed base plate, and the bottom end of the clamping plate is fixedly connected to the top end of the slider. One end of the screw is connected to the clamping plate. This invention, through the coordinated use of the second fixed plate, the clamping plate, the screw, and the fixing nut, allows the clamping plate to move horizontally towards the second fixed plate when the screw is rotated, thereby enabling rapid clamping of the sample. This effectively ensures stability during drilling of the sample and facilitates operation by experimental personnel.

[0004] The aforementioned device generates a large amount of dust when using a core drill bit for sampling. This dust enters the air, damaging the laboratory environment and adversely affecting the health of the staff.

[0005] Therefore, it is necessary to provide a special positioning fixture for core sampling of combustion specimens to solve the above-mentioned technical problems. Utility Model Content

[0006] In response to the above situation and to overcome the defects of the existing technology, this utility model provides a special positioning fixture for core sampling of combustion specimens that can absorb the dust generated during core sampling, thereby reducing the impact of dust on the environment and human health.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A special positioning fixture for core sampling of combustion test specimens, comprising: an outer shell and clamping components installed inside the outer shell; The outer casing includes a housing, which is closed on all sides and has a cover plate at the upper opening. A filter screen is installed on one side of the housing, and a fan is installed on one side of the filter screen. The clamping member includes a pair of clamping plates, which are slidably mounted inside the housing and are driven by a drive assembly. The cover plate is provided with a limiting hole, which is located above the two clamping plates.

[0008] Preferably, the drive assembly includes a slide rod and a threaded rod rotatably mounted on the inner wall of the housing at both ends. The clamping plate is slidably connected to the slide rod, and the clamping plate is threadedly connected to the threaded rod. The threads at both ends of the threaded rod are in opposite directions.

[0009] Preferably, a limiting ring is installed in the limiting hole of the cover plate using a socket type.

[0010] Preferably, the lower end of the housing is provided with a bottom mesh, which is detachably connected to the housing.

[0011] Preferably, the filter screen is detachably connected to the housing.

[0012] Preferably, the cover plate is L-shaped, and one end of the cover plate is hinged to the housing.

[0013] Compared with the prior art, the present invention has the following beneficial effects: (1) This utility model achieves the effect of intercepting dust during the sampling process by setting a filter screen, thereby reducing the amount of dust entering the air and being inhaled by the staff, and protecting the health of the staff and the environment. (2) This utility model can adapt to the corresponding specifications of core drill bits by setting different specifications of limiting rings. The limiting ring can determine the position of the core drill bit in the plane, making the core operation more accurate. (3) This utility model can catch concrete fragments falling from it by setting a bottom net, keeping the work surface clean. After use, the bottom net can be removed from the bottom of the shell for cleaning. Attached Figure Description

[0014] Figure 1 A first-view structural schematic diagram of the special positioning fixture for core sampling of combustion specimens provided by this utility model; Figure 2 A second-view structural schematic diagram of the positioning fixture for core sampling of combustion specimens provided by this utility model; Figure 3 A schematic diagram of the internal structure of the special positioning fixture for core sampling of combustion specimens provided by this utility model; Figure 4 A cross-sectional view of the special positioning fixture for core sampling of combustion specimens provided by this utility model.

[0015] The corresponding names of the reference numerals in the attached drawings are as follows: 10, outer shell; 11, housing; 111, filter screen; 112, magnetic ring; 12, cover plate; 121, limiting hole; 122, limiting ring; 13, fan; 131, frame; 14, bottom mesh; 141, air inlet; 15, foot pad; 20, clamping component; 21, clamping plate; 211, support; 22, slide rod; 23, threaded rod. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.

[0017] Protective concrete is a special type of concrete that maintains strong mechanical properties even under sustained high temperatures. It is frequently used in building or structural components with fire-resistant requirements. To analyze the actual fire-resistant effect of fire-resistant concrete, concrete test blocks are often treated under simulated fire temperatures. Then, a core drill bit is used to extract the central part of the concrete test block to analyze its mechanical and physical properties under high temperature to determine the fire-resistant properties of the concrete. When using existing samplers, the high-speed friction between the concrete and the drill bit generates a large amount of dust. This dust enters the air and affects the health of workers. If this phenomenon can be suppressed during the core sampling process, this problem can be effectively solved.

[0018] First embodiment: like Figure 1 As shown, the present invention provides a special positioning fixture for core sampling of burning specimens, including: a shell 10, and a clamping member 20 installed inside the shell 10. The function of the shell 10 is to prevent dust from spreading into the air during the core sampling process, and the function of the clamping member 20 is to clamp and fix the concrete sample. Specifically, such as Figure 1 As shown, the outer casing 10 includes a housing 11, which is a rectangular structure that is closed on all four sides and open vertically. A cover plate 12 is hinged to the upper opening. The cover plate 12 is L-shaped, and a circular through hole 121 is provided at the upper end of the cover plate 12 for the core drill bit to pass through. On the other hand, a rectangular through hole 111 is provided on one side of the housing 11 for installing a filter screen 111. The filter screen 111 is net-shaped and has an opening, such as... Figure 3-4As shown, a magnetic ring 112 is glued and fixed to the mesh opening of the filter screen 111. The magnetic ring 112 is fixed to the inner wall of the opening of the housing 11. A cylindrical protrusion for receiving and connecting the frame 131 is located on the outer wall of the opening of the housing 11. Both the frame 131 and the protrusion are cylindrical, and the outer diameter of the protrusion is the same as the inner diameter of the frame 131. Therefore, the two can be connected by a socket joint. The fan 13 is fixed on the frame 131, and its distribution on the frame 131 is as follows. Figure 2 As shown, a foot pad 15 is fixed to each of the four corners of the lower end of the housing 11; On the other hand, such as Figure 3 As shown, the clamping component 20 includes a pair of clamping plates 21. The clamping plates 21 are inverted T-shaped. The horizontal part at the lower end is used to support the concrete test block, and the vertical part at the upper end is used to clamp the concrete. A support 211 is fixed on each side of the lower end of the two clamping plates 21. A sliding rod 22 is slidably connected to one support 211, and a threaded rod 23 is threadedly connected to the other support 211. The sliding rod 22 and the threaded rod 23 are parallel to each other and are in a horizontal state. The two ends of the sliding rod 22 are fixed to the inner wall of the housing 11. The two ends of the threaded rod 23 are rotatably installed on the inner wall of the housing 11. At the same time, the thread directions of the left and right halves of the threaded rod 23 are opposite. Therefore, when the threaded rod 23 rotates, the two supports 211 that are threaded on it and are symmetrical on the left and right can drive the clamping plates 21 on it to move synchronously in opposite directions. One end of the threaded rod 23 extends to the outside of the housing 11 and is fixedly installed with a handle that is easy for the operator to hold and rotate. It should be noted that the limiting hole 121 of the cover plate 12 is located directly above the two clamping plates 21. In this way, first open the cover plate 12, rotate the threaded rod 23 to push the two clamping plates 21 closer to each other, place the concrete between the two clamping plates 21 to support and tighten the concrete, then close the cover plate 12, and use a drill with a core drill bit to pass through the limiting hole 121 at the upper end of the cover plate 12. Finally, turn on the fan 13. After the fan 13 rotates, it pushes the airflow from the lower end of the housing 11 into the interior of the housing 11. Then the airflow passes through the filter screen 111 and is discharged from the device. Finally, use the drill bit to drill the core and take a sample. The dust and dust generated in this process will move with the airflow and will eventually be intercepted by the filter screen 111.

[0019] By setting up filter 111, dust can be intercepted during the sampling process, thereby reducing the amount of dust entering the air and being inhaled by staff, thus protecting the health of staff and the environment.

[0020] Second embodiment: like Figure 4As shown, a limiting ring 122 is installed in the limiting hole 121 of the cover plate 12 using a socket type. The limiting ring 122 has a cylindrical structure with a small opening at the upper end and a large opening at the lower end. The outer diameter of the lower end of the limiting ring 122 is the same as the stepped inner diameter of the limiting hole 121. At the same time, the lower end of the limiting hole 121 can support the limiting ring 122 and constrain its downward movement.

[0021] By setting different sizes of limit rings 122, it can adapt to the corresponding size of core drill bit. The limit ring 122 can determine the position of the core drill bit in the plane, making the core operation more precise.

[0022] Third embodiment: like Figure 3-4 As shown, a bottom mesh 14 is provided at the lower end of the housing 11. The width of the bottom mesh 14 is smaller than the width of the opening at the lower end of the housing 11. The gap between the edge of the bottom mesh 14 and the inner wall of the housing 11 is an air inlet 141 for airflow. Magnetic strips are glued and fixed to the edge of the bottom mesh 14 and the lower end of the housing 11. The two are connected by the attraction between the magnetic strips.

[0023] The bottom mesh 14 can catch concrete fragments falling from it, keeping the work surface clean. After use, the bottom mesh 14 can be removed from the bottom of the housing 11 for cleaning.

[0024] Fourth embodiment: like Figure 3-4 As shown, a magnetic ring 112 is glued and fixed at the opening of the filter screen 111. The magnetic ring 112 is magnetic. The side wall of the housing 11 is made of steel plate. Therefore, the filter screen 111 can be adsorbed on the inner wall of the housing 11. At the same time, the filter screen 111 can also be removed from the inner wall of the housing 11 when it needs to be replaced or cleaned.

[0025] Working principle: When the fan 13 is turned on, the fan 13 rotates and pushes the airflow from the lower end of the housing 11 into the interior of the housing 11. Then the airflow passes through the filter screen 111 and is discharged from the device. Finally, the core is drilled and sampled. The dust and ash generated in this process will move with the airflow and will eventually be intercepted by the filter screen 111.

[0026] The above embodiments are merely one of the preferred embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any modifications or refinements made to the main design concept and spirit of this utility model that are not of substantial significance, but solve the same technical problem as this utility model, should be included within the scope of protection of this utility model.

Claims

1. A special positioning fixture for core sampling of combustion specimens, characterized in that, include: The housing (10) and the clamping member (20) installed inside the housing (10); The outer casing (10) includes a casing (11), which is closed on all sides and has a cover plate (12) at the upper opening. A filter screen (111) is installed on one side of the casing (11), and a fan (13) is provided on one side of the filter screen (111). The clamping member (20) includes a pair of clamping plates (21) which are slidably mounted in the housing (11) and are driven by a drive assembly. The cover plate (12) is provided with a limiting hole (121), which is located above the two clamping plates (21).

2. The special positioning fixture for core sampling of combustion specimens according to claim 1, characterized in that, The drive assembly includes a slide rod (22) and a threaded rod (23) that are rotatably mounted on the inner wall of the housing (11) at both ends. The clamping plate (21) is slidably connected to the slide rod (22), and the clamping plate (21) is threadedly connected to the threaded rod (23). The threads at both ends of the threaded rod (23) are in opposite directions.

3. The special positioning fixture for core sampling of combustion specimens according to claim 1 or 2, characterized in that, The limiting ring (122) is installed in the limiting hole (121) of the cover plate (12) in a socket type.

4. The special positioning fixture for core sampling of combustion specimens according to claim 1 or 2, characterized in that, The lower end of the housing (11) is provided with a bottom mesh (14), and the bottom mesh (14) is detachably connected to the housing (11).

5. The special positioning fixture for core sampling of combustion specimens according to claim 1 or 2, characterized in that, The filter (111) is detachably connected to the housing (11).

6. The special positioning fixture for core sampling of combustion specimens according to claim 3, characterized in that, The cover plate (12) is L-shaped, and one end of the cover plate (12) is hinged to the housing (11).

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