CN217443221U - Refractory material sample heating wire expansion measuring device - Google Patents
Refractory material sample heating wire expansion measuring device Download PDFInfo
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- CN217443221U CN217443221U CN202123225688.8U CN202123225688U CN217443221U CN 217443221 U CN217443221 U CN 217443221U CN 202123225688 U CN202123225688 U CN 202123225688U CN 217443221 U CN217443221 U CN 217443221U
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Abstract
The utility model relates to a refractory material sample adds thermal linear expansion measuring device, including heating furnace, outer cover pipe, interior ejector pin, outer cover pipe mount, interior ejector pin mount, accurate linear bearing, thermocouple, displacement measurement device and minute pressure tracking mechanism. The beneficial effects are as follows: the utility model discloses a device simple structure, convenient to use, measurement accuracy is high, but the thermal expansion performance of accurate survey refractory material in the heating process provides reliable technical parameter for the furnace body design of industrial furnace.
Description
Technical Field
The utility model relates to a material performance test technical field especially relates to a refractory material sample heater wire expansion measuring device.
Background
The size or volume of all materials can reversibly increase and decrease along with the increase and decrease of the temperature within a certain temperature range, and the phenomenon of expansion with heat and contraction with cold is the basic property of the materials. The expansion/contraction of the refractory material used at high temperatures during heating or cooling is very significant and therefore can only be used correctly if the amount of expansion/contraction at each temperature is accurately known. The refractory materials are various in types and complex in composition, and in the heating process, due to reversible phase change and other reasons, the size of the refractory materials is mostly nonlinear along with the change of temperature, and a precise measuring instrument is needed to measure the expansion amount at each temperature in real time. At present, the measurement of the thermal (linear) expansion of the refractory material basically adopts a method that a mandril tracks the expansion and contraction of a sample, and the expansion value of a standard sample is used as a reference for assignment. The conventional thermal expansion coefficient measuring instrument has two types, namely a horizontal type and a vertical type, and has the following defects:
1) the expansion and contraction tracking of the sample by the ejector rod basically depends on the spring or cannot leave the spring completely, the tracking pressure of the ejector rod on the sample is generally large and not constant, and the expansion of the sample is influenced by stress;
2) the ejector rod of the horizontal thermal expansion measuring instrument is influenced by cantilever force, and the linearity of the displacement direction is poor when the expansion/contraction of the sample is tracked;
3) most of ejector rods of the vertical thermal expansion measuring instrument are in a free state, and the linearity in the displacement direction in the test process is poor;
4) a displacement sensor of the vertical thermal expansion measuring instrument is positioned above the heating furnace, and a connecting device needs to be cooled, otherwise, the measurement cannot be accurately carried out;
5) the existing thermal expansion measuring instrument is limited by the structure, the diameter of the ejector rod is thinner, and the ejector rod is required to be made of a high-purity material to ensure that the ejector rod cannot deform at high temperature.
SUMMERY OF THE UTILITY MODEL
For overcoming the prior art defect, the utility model provides a technical problem provides a refractory material sample heating wire expansion measuring device, simple structure, convenient to use, and measurement accuracy is high, but the thermal expansion performance of accurate survey refractory material in the heating process provides reliable technical parameter for the furnace body design of industrial kiln.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a refractory material sample heating wire expansion measuring device comprises a heating furnace, an outer cover tube, an inner ejector rod, an outer cover tube fixing frame, an inner ejector rod fixing frame, a precise linear bearing, a thermocouple, a displacement measuring device and a micro-pressure tracking mechanism, and is characterized in that the heating furnace consists of a fixed furnace body, a movable furnace body and a heating body, wherein the movable furnace body and the fixed furnace body are arranged in an up-and-down buckling mode, and the heating body is arranged on the movable furnace body; the upper part of the outer cover pipe is in a free state and is vertically erected in the movable furnace body of the heating furnace, rectangular sample loading holes are symmetrically formed in two sides of the outer cover pipe close to the top, and a thermocouple can extend into the outer cover pipe from the sample loading hole in one side; the upper part of the inner ejector rod is of a circular tube structure with a sealing platform shape, the lower part of the inner ejector rod is fixedly connected with the displacement measurement device through an inner ejector rod fixing frame, and the upper part of the inner ejector rod is vertically erected in the outer cover tube in a free state; the outer sleeve of the precise linear bearing is fixedly connected with the outer cover pipe fixing frame, and the inner sleeve is fixedly connected with the inner ejector rod fixing frame; the displacement measuring device consists of a shell, a differential inner rod and a displacement measuring meter, wherein the shell is fixedly connected with an inner ejector rod fixing frame, the differential inner rod and the displacement measuring meter are integrated and are arranged in an inner hole of the shell and fixedly connected with the shell, and the differential inner rod is fixedly connected with an outer cover pipe fixing frame; the micro-pressure tracking mechanism consists of heavy hammers, a steel wire rope and two fixed pulleys, wherein the two fixed pulleys are symmetrically fixed on the outer cover pipe fixing frame, and the two heavy hammers are respectively connected with the steel wire rope and penetrate through the fixed pulleys to be fixedly connected with the shell.
The inner ejector rod fixing frame is of a hollow boss-shaped structure, an inner ejector rod mounting jack is arranged at the upper part of the inner ejector rod fixing frame, and a notch matched with a penetrating rod arranged at the lower part of the outer cover pipe fixing frame is arranged at the lower part of the inner ejector rod fixing frame.
The differential inner rod is connected with the lower penetrating rod of the outer cover tube fixing frame through a connecting hole, the outer shell is connected with the inner ejector rod fixing frame, and thus the outer cover tube fixing frame and the inner ejector rod fixing frame form a connecting mechanism which is buckled in an inner-outer reversing mode.
The mass sum of the two heavy hammers is 10-100 g greater than the mass sum of the inner ejector rod, the inner ejector rod fixing frame and the displacement measurement device.
The outer cover tube and the inner ejector rod are made of high-purity corundum or fused quartz.
The displacement measuring meter is a digital dial indicator or a ten-thousandth meter and can output displacement measuring signals to a computer.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the furnace body of the heating furnace is divided into a fixed part and a movable part, the movable part can be lifted when samples are loaded, so that the samples can be conveniently placed, and a plurality of sets of measuring devices can be simultaneously installed in one heating furnace to test a plurality of samples at one time;
2) the displacement meter is arranged below the heating furnace, so that high-temperature hot air flow and heat radiation generated by the heating furnace in the test process can be avoided, and the measurement accuracy of the displacement meter can be ensured even if the displacement meter is not cooled;
3) the precision linear bearing arranged between the outer cover tube fixing frame and the inner ejector rod fixing frame can ensure that the linearity deviation of relative movement between the inner ejector rod and the outer cover tube is extremely small in the test process, and the measurement precision of the thermal (linear) expansion amount of the sample is improved;
4) differential interior pole links together with the dustcoat pipe mount, the displacement measurement meter links together with interior ejector pin, and the coupling mechanism who detains mutually is rotated to inside and outside like this constitution has following advantage: firstly, the displacement of the inner mandril in a non-test state can be limited within a certain safety range; secondly, the inner ejector rod with larger diameter (more than or equal to 16mm) is convenient to use, and the high-temperature deformation caused by the inner ejector rod with smaller diameter (about 8mm) adopted by the traditional measuring device can be avoided; thirdly, the safe disassembly and maintenance of the outer cover pipe and the inner ejector rod are facilitated;
5) the displacement measuring meter does not contain an automatic reset spring, a sample thermal (linear) expansion/contraction dynamic uninterrupted tracking mechanism is formed by a heavy hammer, a steel wire rope and a fixed pulley, the tracking force applied to the sample is constant and tiny, the influence of larger tracking stress and variable pressure of the spring on the expansion/contraction of the sample can be avoided, and the measuring precision is improved; meanwhile, the high-temperature stress deformation of the outer cover pipe/the inner ejector rod can be avoided;
6) the displacement measuring meter adopts a digital dial indicator or a ten-thousandth meter, the displacement measuring division value can reach 0.1 mu m, and a displacement measuring signal can be directly output to a computer.
Drawings
Fig. 1 is a schematic view of the structure principle of the present invention;
fig. 2 is an enlarged schematic view of the connection relationship between the outer cover tube fixing frame, the inner supporting rod fixing frame and the displacement measuring device housing according to the present invention.
In the figure: 1-sample 2-sample loading hole 3-outer cover tube 4-inner mandril 5-outer cover tube fixing frame 51-connecting hole 52-penetrating rod 6-inner mandril fixing frame 61-inner mandril installation jack 62-notch 7-heavy hammer 8-shell 81-inner hole 9-differential inner rod 10-precision linear bearing 11-fixed pulley 12-fixed furnace body 13-thermocouple 14-moving furnace body 15-heating body 16-displacement measuring meter
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1 and fig. 2, the utility model relates to a refractory material sample heating wire expansion measuring device, which comprises a heating furnace, an outer cover tube 3, an inner ejector rod 4, an outer cover tube fixing frame 5, an inner ejector rod fixing frame 6, a precise linear bearing 10, a thermocouple 13, a displacement measuring device and a micro-pressure tracking mechanism, wherein the heating furnace comprises a fixed furnace body 12, a movable furnace body 14 and a heating body 15, the movable furnace body 14 and the fixed furnace body 12 are arranged in a vertically buckling manner, and the heating body 15 is arranged on the movable furnace body 14; the outer cover tube 3 is of a cylindrical sleeve structure with a sealed upper part, the lower part of the outer cover tube is fixed on a fixed furnace body 12 of the heating furnace through an outer cover tube fixing frame 5, the upper part of the outer cover tube is vertically erected in a movable furnace body 14 of the heating furnace in a free state, rectangular sample loading holes 2 are symmetrically formed in two sides of the outer cover tube 3 close to the top of the outer cover tube, and a thermocouple 13 can extend into the outer cover tube 3 from the sample loading hole 2 in one side to measure the ambient temperature of a sample; the inner ejector rod 4 is a circular tube structure with the upper part in a sealing platform shape (the platform is used for placing the sample 1), the lower part is fixedly connected with the displacement measurement device through an inner ejector rod fixing frame 6, and the upper part is vertically erected in the outer cover tube 3 in a free state; the outer sleeve of the precise linear bearing 10 is fixedly connected with the outer cover tube fixing frame 5, and the inner sleeve is fixedly connected with the inner ejector rod fixing frame 6, so that the inner ejector rod 4 and the outer cover tube 3 can only perform relative linear sliding in the vertical direction under the constraint of the precise linear bearing 10; the displacement measuring device consists of a shell 8, a differential inner rod 9 and a displacement measuring meter 16, wherein the shell 8 is fixedly connected with an inner ejector rod fixing frame 6, the differential inner rod 9 and the displacement measuring meter 16 are integrated and are arranged in an inner hole 81 of the shell 8 and fixedly connected with the shell 8, and the differential inner rod 9 is fixedly connected with an outer cover pipe fixing frame 5; the micro-pressure tracking mechanism consists of a heavy hammer 7, a steel wire rope and two fixed pulleys 11, wherein the two fixed pulleys 11 are symmetrically fixed on the outer cover pipe fixing frame 5, and the two heavy hammers 7 are respectively connected by the steel wire rope and penetrate through the fixed pulleys 11 to be fixedly connected with the shell 8.
The inner ejector rod fixing frame 6 is of a hollow boss-shaped structure, an inner ejector rod mounting jack 61 is arranged at the upper part of the inner ejector rod fixing frame, and a notch 62 matched with the penetrating rod 52 arranged at the lower part of the outer cover pipe fixing frame 5 is arranged at the lower part of the inner ejector rod fixing frame.
The differential inner rod 9 is connected with a lower penetrating rod 52 of the outer cover tube fixing frame 5 through a connecting hole 51, the outer shell 8 is connected with the inner ejector rod fixing frame 6, so that the outer cover tube fixing frame 5 and the inner ejector rod fixing frame 6 form a connecting mechanism which is buckled in an inner-outer reversing mode, and the relative displacement of the inner ejector rod 4 and the outer cover tube 3 is measured and recorded by a displacement measuring device; the outer mantle pipe mount 5 and the inner ejector rod mount 6 can be detached from the furnace bottom shell, so that the outer mantle pipe 3 and the inner ejector rod 4 can be replaced or maintained conveniently.
The displacement measuring device does not contain an automatic return spring, the uninterrupted tracking and measuring of the thermal (linear) expansion/contraction quantity of the sample 1 completely depends on a micro-pressure tracking mechanism consisting of a heavy hammer 7, a steel wire rope and a fixed pulley 11, the sum of the masses of the two heavy hammers 7 in the micro-pressure tracking mechanism is slightly larger than the mass of the combination body of the inner ejector rod 4, the inner ejector rod fixing frame 6 and the displacement measuring device, and a constant upward force can be applied to the inner ejector rod 4, the inner ejector rod fixing frame 6 and the displacement measuring device.
The outer cover tube 3 and the inner ejector rod 4 are both made of high-purity corundum or fused quartz.
The displacement meter 16 is a digital micrometer or a micrometer, and can output a displacement measurement signal to a computer.
When in work, the operation steps are as follows:
1) preparing a refractory material into a sample 1 with a standard specified shape and size;
2) lifting the heating furnace moving furnace body 14 to expose a sample loading area;
3) a weight with the same mass as the sample 1 and a weight (10 g-100 g larger than the sample) with the mass slightly larger than the sample 1 are sequentially placed on the inner top rod 4, and the mass of the weight 7 is selected and set (the principle is that the mass of the weight 7 is adjusted, so that the upward resilience of the inner top rod 4 can keep continuous tracking of linear expansion/contraction of the sample 1, but the tracking pressure is as small as possible);
4) placing a sample 1 between an inner ejector rod 4 and an outer cover tube 3 in a vertical state, and enabling two end faces of the sample 1 to be in close contact with the inner ejector rod 4 and the outer cover tube 3;
5) lowering the movable furnace body 14 of the heating furnace to close the fixed furnace body 12 of the heating furnace, and adjusting the insertion depth of the thermocouple 13 to enable the hot end of the thermocouple to be close to the sample 1;
6) heating the sample 1 at a certain heating rate, measuring and recording the linear expansion/contraction quantity of the sample 1 at different temperatures, namely the relative displacement of the inner ejector rod 4 and the outer cover tube 3 by a displacement measuring device, transmitting the relative displacement to a computer for storage in real time, and stopping heating after a set heating program is finished;
7) according to the test data, a temperature-sample thermal linear expansion/shrinkage curve is drawn or the sample thermal linear expansion coefficient/expansion coefficient value at the corresponding temperature is given.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (5)
1. A refractory material sample heating wire expansion measuring device comprises a heating furnace, an outer cover tube, an inner ejector rod, an outer cover tube fixing frame, an inner ejector rod fixing frame, a precise linear bearing, a thermocouple, a displacement measuring device and a micro-pressure tracking mechanism, and is characterized in that the heating furnace consists of a fixed furnace body, a movable furnace body and a heating body, wherein the movable furnace body and the fixed furnace body are arranged in an up-and-down buckling manner, and the heating body is arranged on the movable furnace body; the outer cover tube is of a cylindrical sleeve structure with a sealed upper part, the lower part of the outer cover tube is fixed on a fixed furnace body of the heating furnace through an outer cover tube fixing frame, the upper part of the outer cover tube is vertically erected in a movable furnace body of the heating furnace in a free state, rectangular sample loading holes are symmetrically formed in two sides of the outer cover tube close to the top of the outer cover tube, and a thermocouple can extend into the outer cover tube from the sample loading hole in one side of the outer cover tube; the upper part of the inner ejector rod is of a circular tube structure with a sealing platform shape, the lower part of the inner ejector rod is fixedly connected with the displacement measurement device through an inner ejector rod fixing frame, and the upper part of the inner ejector rod is vertically erected in the outer cover tube in a free state; the outer sleeve of the precise linear bearing is fixedly connected with the outer cover pipe fixing frame, and the inner sleeve is fixedly connected with the inner ejector rod fixing frame; the displacement measuring device comprises a shell, a differential inner rod and a displacement measuring meter, wherein the shell is fixedly connected with an inner ejector rod fixing frame, the differential inner rod and the displacement measuring meter are integrated and are arranged in a shell inner hole and fixedly connected with the shell, and the differential inner rod is fixedly connected with an outer cover pipe fixing frame; the micro-pressure tracking mechanism consists of heavy hammers, a steel wire rope and two fixed pulleys, wherein the two fixed pulleys are symmetrically fixed on the outer cover pipe fixing frame, and the two heavy hammers are respectively connected with the steel wire rope and penetrate through the fixed pulleys to be fixedly connected with the shell.
2. The apparatus of claim 1, wherein the inner post rod fixing frame is a hollow boss-shaped structure, the upper portion of the inner post rod fixing frame is provided with an inner post rod mounting jack, and the lower portion of the inner post rod fixing frame is provided with a notch matched with a through rod arranged at the lower portion of the outer cover tube fixing frame.
3. The apparatus as claimed in claim 1 or 2, wherein the differential inner rod is connected to the lower penetrating rod of the outer casing tube holder through a connecting hole, and the outer casing is connected to the inner top rod holder.
4. The apparatus as claimed in claim 1, wherein the sum of the masses of the two weights is 10-100 g greater than the sum of the masses of the inner support rod, the inner support rod fixing frame and the displacement measuring device.
5. The apparatus according to claim 1, wherein the outer jacket tube and the inner post rod are made of high purity corundum or fused silica.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123225688.8U CN217443221U (en) | 2021-12-21 | 2021-12-21 | Refractory material sample heating wire expansion measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123225688.8U CN217443221U (en) | 2021-12-21 | 2021-12-21 | Refractory material sample heating wire expansion measuring device |
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| Publication Number | Publication Date |
|---|---|
| CN217443221U true CN217443221U (en) | 2022-09-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123225688.8U Active CN217443221U (en) | 2021-12-21 | 2021-12-21 | Refractory material sample heating wire expansion measuring device |
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| CN (1) | CN217443221U (en) |
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2021
- 2021-12-21 CN CN202123225688.8U patent/CN217443221U/en active Active
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