Electric heating test device for building materials
By designing an open-closable split electric heating box and supporting platform building materials electrical heating test device, the problem of inconvenience in the prior art being unable to be placed directly in a high-temperature environment and inconvenient to remove the test pieces, effectively heating and testing of building materials at high temperatures is achieved.
Patent Information
- Application Number
- CN202420585042.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-25
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-03-25
AI Technical Summary
In the prior art, when testing the high-temperature properties of building materials, the test device cannot be placed directly in a high-temperature environment, and the test results are affected by the refractory pressure bearing parts, which makes the test piece inconvenient to remove the furnace and is prone to damage.
An electrical heating test device for building materials is designed, including an open and closed split electric heating box and a support platform. The electric heating box is equipped with a heat insulation layer and an electric heating rod. The pallet and the test piece can be removed from the bottom through the discharge hole, and the thermal insulation door can be adjusted to allow the test piece to be removed.
It realizes heating and testing of building materials in high temperature environments without damaging the test furnace. The test specimens are easy to remove, avoiding the test results being affected by refractory pressure bearing parts.
Smart Images
Figure CN222560632U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fire experiments, in particular to an electric heating test device for building materials. Background Art
[0002] When a fire occurs, a series of physical and chemical microscopic changes in building materials affected by high temperature will cause a decrease in the macroscopic bearing capacity of the building structure. Usually, the equipment for testing the mechanical properties of building materials cannot be placed directly in a high temperature environment. If it is necessary to test the high temperature performance of building materials under high temperature, it is necessary to first heat the building materials to the design temperature and then conduct the mechanical property test. For non-metallic materials, such as concrete, the concrete specimen can be placed in a high temperature heating furnace, and the upper and lower surfaces of the concrete specimen are respectively connected to refractory pressure-bearing parts, one end of the pressure-bearing part is in contact with the concrete surface, and the other end is in contact with the pressure-bearing end of the universal testing machine, and the mechanical property test of the concrete material is carried out at high temperature or after high temperature. This method has two main defects. First, the pressure-bearing end of the universal testing machine does not directly act on the surface of the concrete specimen, and the test results are affected by the fire-resistant pressure-bearing parts; second, the concrete specimen is located in a closed test furnace during the test, which is not conducive to observing the damage of the specimen, and it is easy to damage the internal structure of the test furnace when the concrete material is damaged. The cooling conditions after high temperature have a great influence on the mechanical properties of concrete materials. The mechanical properties of concrete materials that are naturally cooled in the air after high temperature and concrete materials that are cooled in the furnace after high temperature are quite different. Therefore, there is an urgent need for a test device that can heat building materials at high temperature without damaging the interior of the test furnace after heating, and the test specimens can be easily removed from the test furnace. Utility Model Content
[0003] The purpose of the utility model is to overcome the deficiencies in the prior art and to provide a test device which can heat building materials at high temperatures without damaging the interior of the test furnace after heating and allows test specimens to be easily removed from the test furnace.
[0004] In order to achieve the above object, the utility model is implemented through the following technical solutions:
[0005] A building material electric heating test device comprises an electric heating box and a supporting platform, wherein an upright fixed bracket is arranged on the supporting platform, and a storage rack which is inserted into the electric heating box is arranged on the top side of the electric heating box by the fixed bracket, and a tray is arranged at the bottom end of the storage rack; the electric heating box is an openable and closable split structure, and legs are arranged at the bottom end of the electric heating box, and the joint ends on the back side of the electric heating box are hinged to the fixed bracket, an insulating layer is arranged in the outer shell of the electric heating box, and electric heating rods are evenly arranged in the insulating layer, a discharge hole which allows the tray to extend out is opened at the bottom of the electric heating box, and an adjustable insulating door which closes the discharge hole is arranged on the fixed bracket, and a cable box and a thermocouple are arranged outside the electric heating box, and the cable box is connected to each electric heating rod through a cable.
[0006] Furthermore, the storage rack is composed of a topmost crossbeam and a plurality of support rods connected downward in sequence at both ends of the crossbeam, the support rods are connected by matching bolt holes and connecting parts, the support rod at the bottom is connected to the tray, the top surface of the electric heating box body has a through hole matching the support rod, the top surface of the electric heating box body is fixedly provided with a positioning frame, the positioning frame is provided with positioning holes matching the bolt holes, and the positioning holes and the bolt holes are connected and positioned by long rod bolts.
[0007] Furthermore, the fixed bracket is provided with a cantilever connected and positioned with the storage rack.
[0008] Furthermore, the thermal insulation door is a symmetrical split structure, the joint of the thermal insulation door is a zigzag structure, and a scissor-shaped handle is provided on the thermal insulation door. The central axis of the scissor-shaped handle is rotatably set between the fixed bracket and the height of the scissor-shaped handle on the fixed bracket is locked.
[0009] Furthermore, the electric heating box is a regular hexagonal columnar structure composed of two half boxes, the legs at the bottom of each half box are provided with universal wheels, the closed ends of the two half boxes are externally provided with locks, and the bottom of the support platform is provided with universal wheels.
[0010] Furthermore, a heat-insulating plate is provided on the bottom side of the support platform corresponding to the discharge hole, and the height of the legs allows the tray and the test piece to be placed on the heat-insulating plate after being discharged from the discharge hole.
[0011] Furthermore, a diagonal brace is fixedly connected between the side of the support platform and the top of the fixed bracket.
[0012] Furthermore, the insulation plate is built with refractory bricks, the thermal conductivity of the refractory bricks is not greater than 1.0 W / (m·K), the compressive strength of the refractory bricks is not less than 25 MPa, and the thickness of the refractory bricks at the thinnest point is not less than 100 mm.
[0013] Furthermore, the thermal insulation layer adopts a ceramic fiber module with a thickness of not less than 80 mm and a thermal conductivity of not more than 0.06 W / (m·K).
[0014] Compared with the prior art, the utility model has the following beneficial effects:
[0015] The storage rack of the utility model can be passed out from the top of the electric heating box, and the tray and the test piece can be passed out from the unloading hole at the bottom of the electric heating box, which is convenient for high-temperature heating of the test piece and moving the heated test piece out of the furnace. While the insulated door closes the unloading hole, its scissor-shaped handle can ensure that the test piece can be easily moved out of the furnace after being closed and heated in the furnace. The two half boxes of the electric heating box rotate around the fixed bracket of the support platform through the universal wheels and hinge structure, which is convenient for opening the furnace to arrange the test pieces. The fixed bracket, diagonal brace and universal wheel of the support platform ensure the stability of the electric heating box opening and closing around the fixed position on the support platform, so that it will not overturn during the heating process and the entire test device can be moved freely in the laboratory. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of the utility model;
[0017] Figure 2 It is a side view of the utility model;
[0018] Figure 3 It is a top view of the utility model;
[0019] Figure 4 This is the internal structure diagram of the electric heating box in the utility model;
[0020] Figure 5 This is a half box structure diagram of the electric heating box in the utility model;
[0021] Figure 6 This is a schematic diagram of the structure of the storage rack in the utility model;
[0022] Figure 7 This is a schematic diagram of the structure of the heat insulation door of the utility model;
[0023] Figure 8 It is a structural schematic diagram of the positioning frame in the utility model.
[0024] Reference numerals:
[0025] 1-test piece, 2-shelf, 3-electric heating box, 4-tray, 5-leg, 6-support platform, 7-universal wheel, 8-insulation layer, 9-cable box, 10-thermocouple, 11-positioning frame, 12-insulation door, 13-lock, 14-furnace, 15-unloading hole, 16-electric heating rod, 17-fixed bracket, 18-cantilever, 19-diagonal brace, 20-insulation plate, 21-cable, 22-hinge, 23-support rod, 24-crossbeam, 25-bolt hole, 26-through hole, 27-long rod bolt, 28-positioning hole, 121-scissor-shaped handle, 122-center axis. DETAILED DESCRIPTION
[0026] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.
[0027] like Figures 1 to 8 As shown, an electric heating test device for building materials comprises an electric heating box 3 and a supporting platform 6, wherein an upright fixed bracket 17 is arranged on the supporting platform 6, and a storage rack 2 which penetrates into the electric heating box 3 is arranged on the top side of the electric heating box 3 by the fixed bracket 17, and a tray 4 is arranged at the bottom end of the storage rack 2; the electric heating box 3 is an openable and closable split structure, and a supporting leg 5 is arranged at the bottom end of the electric heating box 3, and the joint ends on the back side of the electric heating box 3 are hinged to the fixed bracket 17, and a heat insulation layer 8 is arranged in the outer shell of the electric heating box 3, and electric heating rods 16 are evenly arranged in the heat insulation layer 8, and a discharge hole 15 which allows the tray 4 to extend is opened at the bottom of the electric heating box 3, and an adjustable heat insulation door 12 which closes the discharge hole 15 is arranged on the fixed bracket 17, and a cable box 9 and a thermocouple 10 are arranged on the outside of the electric heating box 3, and the cable box 9 is connected to each electric heating rod 16 through a cable 21.
[0028] like Figure 2 , Figure 6 and Figure 8As shown, the storage rack 2 is composed of a crossbeam 24 at the top and a plurality of support rods 23 connected downward in sequence at both ends of the crossbeam 24. The support rods 23 are connected to each other through matching bolt holes 25 and connectors. The support rod 23 at the bottom is connected to the tray 4. The top surface of the electric heating box 3 has a through hole 26 that matches the support rod 23. The top surface of the electric heating box 3 is fixedly provided with a positioning frame 11. The positioning frame 11 is provided with a positioning hole 28 that matches the bolt hole 25. The positioning hole 28 and the bolt hole 25 are connected and positioned by a long rod bolt 27. The storage rack 2 can pass through the through hole 26 at the top of the electric heating box 3. The through hole 26 can be slotted at the joint of the two half boxes. After the two half boxes are closed, two through holes 26 are formed. The gap between the through hole 26 and the support rod 23 can be closed by plugging thermal insulation cotton. The support rods 23 of the rack 2 are arranged in sections, and a plurality of bolt holes 25 for adjusting the height and positioning of the rack 2 can be formed, so that the corresponding height of the tray 4 in the furnace 14 can be changed according to the volume of the test piece 1 during the test, and then the height position can be locked with the positioning hole 28 on the positioning frame 11. The fixed bracket 17 is provided with a cantilever 18 connected and positioned with the rack 2, so that the rack 2 can be positioned between the positioning frame 11 and the cantilever 18 at the same time, further ensuring that the height position of the rack 2 is stable. The cantilever 18 can also be connected to the rack 2 by setting the positioning hole 28 and the long rod bolt 27 in the same way as the positioning frame 11.
[0029] like Figure 7 As shown, the heat-insulating door 12 is a symmetrical split structure, and the joint of the heat-insulating door 12 is a zigzag structure. A scissor-shaped handle 121 is provided on the heat-insulating door 12. The central axis 122 of the scissor-shaped handle 121 is rotatably arranged between the fixed bracket 17 and locks the height of the scissor-shaped handle 121 on the fixed bracket 17. The central axis 122 plays the role of both rotating with the fixed bracket 17 and locking the heat-insulating door 12 at the bottom height of the discharge hole 15. While the heat-insulating door 12 closes the discharge hole 15, its scissor-shaped handle 121 can ensure that the test piece 1 is easy to move out of the furnace 14 after being closed and heated in the furnace 14. The zigzag structure at the joint of the heat-insulating door 12 can ensure that the high temperature in the furnace 14 can be effectively blocked when the two half heat-insulating doors are closed. A heat-insulating layer can also be provided on the upper end surface of the heat-insulating door 12 to protect the heat-insulating door 12 and prevent heat from being transferred to the scissor-shaped handle 121.
[0030] The electric heating box 3 is a regular hexagonal columnar structure composed of two half boxes, the legs 5 at the bottom of each half box are provided with universal wheels 7, the closed ends of the two half boxes are matched with lock buckles 13, and the bottom of the support platform 6 is provided with universal wheels 7. The two half boxes rotate around the fixed bracket 17 through the universal wheels 7 and the hinges 22, which facilitates the opening of the furnace 14 for the arrangement of the test piece 1, and the universal wheels 7 of the support platform 6 facilitate the entire test device to be moved arbitrarily in the laboratory.
[0031] Among them, the support platform 6 is provided with an insulation plate 20 at the bottom side corresponding to the discharge hole 15, and the height of the legs 5 allows the tray 4 and the test piece 1 to be placed on the insulation plate 20 after being discharged from the discharge hole 15. The insulation plate 20 is used to protect the support platform 6 to prevent the tray 4 and the test piece 1 from damaging the support platform 6 after being discharged. The height of the legs 5 is greater than the sum of the thicknesses of the tray 4, the test piece 1, the insulation door 12 and the insulation plate 20, so that the tray 4 and the test piece 1 can be smoothly discharged from the discharge hole 15. An oblique brace 19 is fixedly connected between the side of the support platform 6 and the top of the fixed bracket 17. The two oblique braces 19 and the support platform 6 together form a triangular structure, so that the upright fixed bracket 17 supports the electric heating box 3 more stably.
[0032] The utility model occupies a small area. The heat insulation plate 20 is built of refractory bricks. The thermal conductivity of the refractory bricks is not more than 1.0W / (m·K), the compressive strength of the refractory bricks is not less than 25MPa, and the thickness of the thinnest part of the refractory bricks is not less than 100mm. The heat insulation layer 8 adopts a ceramic fiber module with a thickness of not less than 80mm and a thermal conductivity of not more than 0.06W / (m·K). During the heating process of the test piece 1, the thermocouple 10 monitors the temperature in the furnace 14. The rack 2 can be used in conjunction with a small crane or a crane. After the test piece 1 is heated, the crossbeam 24 of the rack 2 is hoisted by the hook of the small crane or the crane, and the long rod bolts 27 connecting the cantilever 18, the positioning frame 11 and the rack 2 are loosened in turn, and the insulation door 12 is opened. The hook of the small crane or the crane is lowered until the tray 4 is completely in contact with the insulation plate 20 on the support platform 6, and the test piece 1 is clamped out by the refractory tongs, which is convenient for subsequent mechanical property tests of building materials at or after high temperature.
[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A building material electric heating test device, comprising an electric heating box (3) and a supporting platform (6), characterized in that: The support platform (6) is provided with an upright fixed bracket (17), and a storage rack (2) is arranged on the top side of the electric heating box (3) and is inserted into the electric heating box (3), and a tray (4) is arranged at the bottom end of the storage rack (2); the electric heating box (3) is a split structure that can be opened and closed, and a support leg (5) is arranged at the bottom end of the electric heating box (3), and the joint ends on the back side of the electric heating box (3) are hinged to the fixed bracket (17), and the electric heating box (3) is The outer shell of the electric heating box (3) is provided with a heat insulating layer (8), and electric heating rods (16) are evenly distributed in the heat insulating layer (8). The bottom of the electric heating box (3) is provided with a discharge hole (15) through which the tray (4) can be extended. An adjustable heat insulating door (12) for closing the discharge hole (15) is provided on the fixed bracket (17). A cable box (9) and a thermocouple (10) are provided outside the electric heating box (3), and the cable box (9) is connected to each electric heating rod (16) through a cable (21).
2. A building material electric heating test device according to claim 1, characterized in that: The storage rack (2) is composed of a crossbeam (24) at the top and a plurality of support rods (23) connected downward in sequence at both ends of the crossbeam (24); the support rods (23) are connected to each other through matching bolt holes (25) and connecting pieces; the support rod (23) at the bottom is connected to the tray (4); the top surface of the electric heating box (3) has a through hole (26) matching the support rod (23); a positioning frame (11) is fixedly provided on the top surface of the electric heating box (3); a positioning hole (28) matching the bolt hole (25) is provided on the positioning frame (11); the positioning hole (28) and the bolt hole (25) are connected and positioned by a long rod bolt (27).
3. A building material electric heating test device according to claim 2, characterized in that: The fixed bracket (17) is provided with a cantilever (18) connected and positioned with the storage rack (2).
4. The electric heating test device for building materials according to claim 1, characterized in that: The heat-insulating door (12) is a symmetrical split structure, the joint of the heat-insulating door (12) is a zigzag structure, a scissor-shaped handle (121) is provided on the heat-insulating door (12), and the central axis (122) of the scissor-shaped handle (121) is rotatably arranged between the fixed bracket (17) and the height of the scissor-shaped handle (121) on the fixed bracket (17) is locked.
5. The electric heating test device for building materials according to claim 1, characterized in that: The electric heating box (3) is a regular hexagonal columnar structure composed of two half boxes, the legs (5) at the bottom of each half box are provided with universal wheels (7), the closed ends of the two half boxes are externally provided with lock buckles (13), and the bottom of the support platform (6) is provided with universal wheels (7).
6. The electric heating test device for building materials according to claim 1, characterized in that: A heat-insulating plate (20) is provided on the bottom side of the support platform (6) corresponding to the discharge hole (15), and the height of the legs (5) enables the tray (4) and the test piece (1) to be placed on the heat-insulating plate (20) after being discharged from the discharge hole (15).
7. A building material electric heating test device according to claim 6, characterized in that: A diagonal brace (19) is fixedly connected between the side of the support platform (6) and the top of the fixed bracket (17).
8. The electric heating test device for building materials according to claim 6, characterized in that: The heat insulation plate (20) is built with refractory bricks, the thermal conductivity of the refractory bricks is not greater than 1.0 W / (m·K), the compressive strength of the refractory bricks is not less than 25 MPa, and the thickness of the refractory bricks at the thinnest part is not less than 100 mm.
9. The electric heating test device for building materials according to claim 1, characterized in that: The heat insulation layer (8) adopts a ceramic fiber module with a thickness of not less than 80 mm and a thermal conductivity of not more than 0.06 W / (m·K).