Thermal dilatometer for magnesia carbon brick production

Abstract

The utility model discloses a thermal dilatometer for magnesia carbon brick production, and particularly relates to the technical field of refractory material detection. Comprising a test box body, a test tube movably inserted into the test box body, a sealing cover arranged on the test tube, a sealing plug fixedly connected to the bottom of the sealing cover and inserted into the inner side of the test tube, a light floating needle movably penetrating through the sealing cover and the sealing plug, a supporting strip fixedly connected to the top of the light floating needle, and a driving plate arranged at the top of the supporting strip, the display panel is arranged above the test box body, the positioning column is fixedly connected to the center position of the front side of the display panel, the rotating ring is movably connected to the outer side of the positioning column, and the pointer is fixedly connected to one side of the rotating ring. According to the utility model, the light floating needle is slightly abutted against a sample, so that detection errors caused by extra pressing force are avoided, and the accuracy of detection data is guaranteed; meanwhile, the micro expansion displacement of the sample is amplified according to the similar triangle principle and is visually presented through the pointer and the scale marks, the problem of inconvenient reading is solved, and the detection convenience is improved.

Description

Technical Field

[0001] This utility model relates to the field of refractory material testing technology, and more specifically, to a thermal expansion meter for the production of magnesia-carbon bricks. Background Technology

[0002] Thermal dilatometers are key equipment in the field of materials science for measuring the thermophysical properties of materials. They are primarily used to detect the dimensional changes of materials during temperature variations, and then calculate key indicators such as the coefficient of linear thermal expansion. This provides important data support for the research and development, production quality control, and service performance evaluation of refractory materials, and is widely used in many fields that rely on the performance of refractory materials, such as aerospace, electronic packaging, and machinery manufacturing.

[0003] Currently, various simplified thermal expansion testing devices for refractory materials are available on the market. Among them, a utility model patent with Chinese Patent Network announcement number CN222939033U discloses a related thermal expansion testing device, including a test chamber and an insulated inner cavity. The insulated inner cavity is located inside the test chamber, and test tubes are installed inside the test chamber. A heating component is located inside the test chamber, and an observation assembly is located on the top of the test chamber. The observation assembly includes a pair of connecting frames, with a movable frame slidably connected to the surface of the connecting frames. Movable grooves are opened on both sides of the movable frames, and sealing sleeves are slidably connected within the movable grooves. Locking blocks are threadedly connected to both ends of the sealing sleeves. This solves the problems of existing technologies where real-time observation is not possible when testing the high-temperature thermal expansion of refractory materials, and where the internal heating structure transmits heat slowly, resulting in poor sealing during installation and inconvenience for loading and unloading. While this device achieves thermal expansion detection with a simple structure, reducing equipment costs, it reveals two significant drawbacks in practical applications, severely impacting detection accuracy and practicality: First, the rod used to hold the test material is a traditional rigid coarse pressure rod. During the holding process, an upper thrust is applied to the sample, and the counter-thrust force of the pressure spring further creates constraint stress. Since refractory materials exhibit three-dimensional free expansion, the upper thrust and the counter-thrust force of the pressure spring inhibit the free expansion of the sample in the vertical direction, thus interfering with the accurate acquisition of longitudinal expansion data and causing systematic errors in the calculation of the thermal expansion coefficient. Second, the thermal expansion of refractory materials is extremely small, with only a small amount of visible growth. This device uses a traditional scale display method and lacks a micro-displacement amplification mechanism, failing to visually represent the minute expansion changes of the refractory material after heating. This not only easily leads to reading errors but also reduces testing efficiency, making it difficult to meet the basic requirements of accuracy and convenience in actual production testing.

[0004] In summary, to improve the accuracy and practicality of thermal expansion testing of refractory materials and meet the needs of actual production testing for convenience and data accuracy, it is necessary to solve the problems of detection errors caused by the thrust of the coarse pressure rod and the counter-thrust of the pressure spring in the existing reference patent device, and the inability of traditional scales to intuitively display minute expansion amounts. This would enable the thermal expansion meter to accurately collect and intuitively present the thermal expansion data of refractory materials, providing reliable support for the quality control and performance evaluation of refractory materials. Utility Model Content

[0005] The present invention provides a thermal expansion meter for the production of magnesia-carbon bricks, which aims to solve the following problems: the detection error caused by the thrust of the coarse pressure rod and the counter-thrust of the pressure spring in the existing reference patent device, and the inability of traditional scale to intuitively display minute expansion amounts.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a thermal expansion meter for magnesia-carbon brick production, comprising a test chamber, a test tube movably inserted into the test chamber, a cap on the test tube, a sealing plug fixedly connected to the bottom of the cap and inserted into the inside of the test tube, a lightweight floating needle movably penetrating the cap and the sealing plug, a support bar fixedly connected to the top of the lightweight floating needle, a driving plate on the top of the support bar, a display panel above the test chamber, a positioning post fixedly connected to the center of the front side of the display panel, a rotating ring movably connected to the outside of the positioning post, a pointer fixedly connected to one side of the rotating ring, a connecting plate fixedly connected to the other side of the rotating ring, and an arc-shaped scale line located at the outer edge of the display panel. The side of the connecting plate away from the rotating ring is fixedly connected to the driving plate, and the driving plate and the pointer are located on the same axis.

[0007] In a preferred embodiment, the surface of the display panel is provided with a horizontal X-axis line and a vertical Y-axis line, which are perpendicular to each other. The distance between the support point of the support bar and the center axis of the positioning post is set to one-fifth of the distance between the pointer tip and the center axis of the positioning post.

[0008] In a preferred embodiment, magnetic blocks are fixedly connected to both sides of the upper end of the support bar, and the drive plate is movably positioned between the two magnetic blocks. Magnetic plates are attracted to the upper ends of the two magnetic blocks, and handle posts are fixedly connected to the upper ends of the magnetic plates.

[0009] In a preferred embodiment, a cylinder is fixedly installed at the upper end of the test chamber, and a support base is fixedly connected to the output end of the cylinder. The cylinder is used to drive the support base to move up and down, and the support base is fixedly connected to the display panel.

[0010] In a preferred embodiment, an external threaded ring 1 is fixedly connected to the outer side of the upper end of the test tube, and an external threaded ring 2 is fixedly connected to the outer side of the cap. An internal threaded connecting sleeve is threadedly connected to the outer sides of the external threaded ring 1 and the external threaded ring 2.

[0011] In a preferred embodiment, a positioning ring is fixedly connected to the bottom of the external threaded ring one and is fixedly connected to the outside of the test tube, and a positioning ring is fixedly connected to the top of the external threaded ring two and is fixedly connected to the outside of the cap.

[0012] In a preferred embodiment, two fixed plates are fixedly connected to the upper end of the test chamber, two movable frames are provided above the test chamber, and two pressure plates are provided at the upper end of the cover. A set of clamping drive mechanisms is installed on each of the two movable frames. The output end of each set of clamping drive mechanisms is connected to a corresponding pressure plate. The clamping drive mechanism is used to drive the pressure plate to move up and down. A position adjustment mechanism is installed on the two fixed plates. The output end of the position adjustment mechanism is connected to the two movable frames. The position adjustment mechanism is used to drive the two movable frames to move closer or farther apart.

[0013] In a preferred embodiment, each set of pressing drive mechanisms includes a threaded rod rotatably connected to the inside of the movable frame, a lifting plate threadedly connected to the outside of the threaded rod, and a knob rotatably mounted on the outside. The lifting plate is fixedly connected to the corresponding pressure plate, and the knob is fixedly connected to the threaded rod via a shaft.

[0014] In a preferred embodiment, the position adjustment mechanism includes a bidirectional screw rotatably connected between two fixed plates, movable plates symmetrically threaded to the outer ends of the bidirectional screw, and a second knob rotatably connected to one of the fixed plates. The two movable plates are respectively fixedly connected to two movable frames, and the second knob is fixedly connected to the bidirectional screw via a shaft.

[0015] The beneficial effects of this utility model are as follows:

[0016] This invention employs a combination of a lightweight floating needle and a magnetic limiting mechanism, allowing the lightweight floating needle to lightly contact the sample surface without applying additional clamping force. This effectively avoids the constraint stress caused by the upper thrust applied by the traditional coarse pressure rod, eliminates the inhibitory effect of this thrust on the vertical expansion of the sample, solves the detection error problem caused by pressure interference in the prior art, and ensures the authenticity and accuracy of thermal expansion detection data.

[0017] This invention, by setting a reasonable size ratio between the rotating ring, pointer, arc-shaped scale line, support bar, and pointer end, utilizes the principle of similar triangles to amplify the minute expansion displacement of the sample after heating. This allows the minute expansion amount, which was originally difficult to observe intuitively, to be clearly presented through the scale indicated by the pointer. This completely solves the problem of small expansion amount and inability to intuitively present readings in the background technology for metal and magnesium-carbon brick materials, and improves the convenience and accuracy of detection readings.

[0018] This invention features a cylinder that allows for flexible adjustment of the display panel height, accommodating samples of varying lengths and expanding the equipment's applicability. It also incorporates a clamping drive mechanism and a position adjustment mechanism. The position adjustment mechanism employs a clearance design, moving the moving frame and pressure plate away from each other for easier insertion and removal of test tubes. The clamping drive mechanism securely clamps the cap, ensuring the stability of the test tubes and caps during testing and guaranteeing a smooth testing process. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model.

[0020] Figure 2 This is a partial disassembly diagram of the present invention. Figure 1 .

[0021] Figure 3 This is a partial disassembly diagram of the present invention. Figure 2 .

[0022] Figure 4 This is a partial disassembly diagram of the present invention. Figure 3 .

[0023] Figure 5 For the present utility model Figure 4 Schematic diagram of the exploded structure.

[0024] Figure 6 This is a schematic diagram of the three-dimensional structure of the display panel of this utility model. Figure 1 .

[0025] Figure 7 This is a schematic diagram of the rotating ring three-dimensional structure of this utility model.

[0026] Figure 8 This is a schematic diagram of the three-dimensional structure of the display panel of this utility model. Figure 2 .

[0027] The attached diagram is labeled as follows: 1. Test chamber; 2. Test tube; 3. Cap; 4. Sealing plug; 5. Lightweight floating needle; 6. Support bar; 701. Threaded rod; 702. Lifting plate; 703. Knob one; 801. Bidirectional screw; 802. Moving plate; 803. Knob two; 9. Drive plate; 10. Pressure plate; 11. Cylinder; 12. Support base; 13. Display panel; 14. Positioning post; 15. Rotary ring; 16. Pointer; 17. Connecting plate; 18. Arc-shaped scale line; 19. X-axis horizontal line; 20. Y-axis vertical line; 21. Magnetic block; 22. Magnetic plate; 23. Handle post; 24. External threaded ring one; 25. External threaded ring two; 26. Internal threaded connecting sleeve; 27. Positioning ring one; 28. Positioning ring two; 29. ​​Fixed plate; 30. Moving frame. Detailed Implementation

[0028] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0029] Refer to the instruction manual appendix Figures 1 to 8 A thermal expansion tester for magnesia-carbon brick production includes a test chamber 1, a test tube 2 movably inserted into the test chamber 1, a cap 3 on the test tube 2, a sealing plug 4 fixedly connected to the bottom of the cap 3 and inserted into the inside of the test tube 2, a lightweight floating needle 5 movably penetrating the cap 3 and the sealing plug 4, a support bar 6 fixedly connected to the top of the lightweight floating needle 5, a drive plate 9 on the top of the support bar 6, a display panel 13 above the test chamber 1, a positioning post 14 fixedly connected to the center of the front side of the display panel 13, a rotating ring 15 movably connected to the outside of the positioning post 14, a pointer 16 fixedly connected to one side of the rotating ring 15, a connecting plate 17 fixedly connected to the other side of the rotating ring 15, and an arc-shaped scale line 18 located at the outer edge of the display panel 13. The side of the connecting plate 17 away from the rotating ring 15 is fixedly connected to the drive plate 9, and the drive plate 9 and the pointer 16 are located on the same axis.

[0030] It should be noted that the test chamber 1 serves as the mounting base for the entire device, integrating a heating component to provide a stable high-temperature testing environment for the test tube 2, adapting to the high-temperature thermal expansion testing requirements of magnesia-carbon bricks. The test tube 2 is used to hold the magnesia-carbon brick sample, and its movable insertion into the test chamber 1 facilitates sample handling and maintenance of the test tube 2. The cap 3 seals the opening at the top of the test tube 2, and the sealing plug 4, made of a high-temperature resistant flexible sealing material, is embedded inside the test tube 2 to achieve an internal seal, preventing gas leakage or external air intrusion that could interfere with the testing during heating. The lightweight floating needle 5, made of sapphire, is lightweight, high-temperature resistant, and has low thermal expansion, reducing the pressure of its own weight on the sample. Its bottom is slightly in contact with the sample surface, and it can be lifted synchronously when the sample expands. The support bar 6 at the top is used to support the driving plate 9 to achieve stable transmission of force and displacement. The display disk 13 is the carrier for displaying the expansion amount. The positioning post 14 is fixed in the center of the display disk 13, providing a rotation fulcrum for the rotating ring 15. The rotating ring 15 can rotate flexibly around the positioning post 14. The pointer 16 on one side is used to indicate the arc-shaped scale line 18, and the connecting plate 17 on the other side is used to connect the driving plate 9. The driving plate 9 and the pointer 16 are set coaxially to ensure that the displacement of the driving plate 9 can be synchronously transmitted to the pointer 16. The arc-shaped scale line 18 is marked with the converted expansion height value, which is convenient for intuitive reading of the test results.

[0031] Refer to the instruction manual appendix Figure 2The surface of the display panel 13 is provided with an X-axis horizontal line 19 and a Y-axis vertical line 20, which are perpendicular to each other. The distance between the support bar 6 and the support position point of the drive plate 9 and the center axis of the positioning post 14 is set to one-fifth of the distance between the end of the pointer 16 and the center axis of the positioning post 14.

[0032] It should be noted that the horizontal X-axis line 19 and the vertical Y-axis line 20 on the surface of the display panel 13 are perpendicular to each other. This is used to check the horizontal and vertical status of the pre-calibration equipment, ensuring the accuracy of the initial position of the pointer 16 and providing a benchmark for subsequent expansion measurement. The distance between the support point of the support bar 6 and the central axis of the positioning post 14 is designed to be one-fifth of the distance between the end of the pointer 16 and the central axis of the positioning post 14. This size ratio is based on the principle of similar triangles to amplify the expansion. The specific conversion logic is as follows: Let the height change of the lightweight floating needle 5 be Δh (vertical displacement), the horizontal distance from the support point to the central axis of the positioning post 14 be r, and the horizontal distance from the end of the pointer 16 to the central axis of the positioning post 14 be R (R=5r, both centered on the positioning post 14). (Measured along the horizontal direction to avoid mistaking R as the hypotenuse); When the sample expands and lifts the lightweight floating needle 5, causing a vertical displacement of Δh, it drives the plate 9 to rise synchronously, which in turn drives the connecting plate 17 and the rotating ring 15 to rotate around the positioning column 14. At this time, the vertical displacement Δh and horizontal distance r of the support position point, and the vertical displacement ΔH and horizontal distance R of the end of the pointer 16, respectively form two similar right triangles (the legs of the right triangles are the horizontal distance and the vertical displacement); According to the principle that the corresponding legs of similar triangles are proportional, Δh / r=ΔH / R, substituting R=5r, we can calculate that ΔH=Δh×R / r=5Δh, which realizes a 5-fold amplification of the vertical displacement of the lightweight floating needle 5, effectively solving the problem that the small expansion of metal and magnesium carbon bricks is difficult to display intuitively, and improving the reading accuracy.

[0033] Refer to the instruction manual appendix Figure 7 Magnetic blocks 21 are fixedly connected to the upper two sides of the support bar 6, and the drive plate 9 is movably set between the two magnetic blocks 21. Magnetic plates 22 are attracted to the upper ends of the two magnetic blocks 21, and handle posts 23 are fixedly connected to the upper ends of the magnetic plates 22.

[0034] It should be noted that the magnetic blocks 21 on both sides of the upper end of the support bar 6 are made of permanent magnet material. The two magnetic blocks 21 are symmetrically arranged to form a limiting space for placing the driving plate 9. The driving plate 9 is movably set between the two magnetic blocks 21 and can move flexibly within the limiting range. This ensures that the driving plate 9 can rise and fall synchronously with the support bar 6, while avoiding displacement distortion caused by the displacement plate 9 shifting. The magnetic plate 22 can be attracted to the upper end of the two magnetic blocks 21, which plays a limiting and fixing role for the driving plate 9, preventing the driving plate 9 from detaching from the support bar 6 during the detection process and affecting the detection stability. At the same time, the magnetic connection method facilitates installation before detection and disassembly after detection. The handle 23 at the upper end of the magnetic plate 22 makes it easy for the operator to manually pick up and put down the magnetic plate 22, simplifying the operation process of equipment debugging and sample replacement, and improving detection efficiency.

[0035] Refer to the instruction manual appendix Figure 8 A cylinder 11 is fixedly installed on the upper end of the test chamber 1. A support base 12 is fixedly connected to the output end of the cylinder 11. The cylinder 11 is used to drive the support base 12 to move up and down. The support base 12 is fixedly connected to the display panel 13.

[0036] It should be noted that the cylinder 11 fixed at the upper end of the test chamber 1 is a small lifting model with a compact structure and high lifting accuracy. Its output end is fixedly connected to the support base 12, and the support base 12 is firmly connected to the display panel 13, which can realize the stable support and synchronous lifting of the display panel 13. The core function of the cylinder 11 is to drive the support base 12 to drive the display panel 13 to lift and lower, so that the position of the display panel 13 can be adjusted according to the height of the support bar 6 before the test, so that the horizontal line 19 of the X-axis on the display panel 13 is level with the upper end of the support bar 6, ensuring that the initial position of the pointer 16 is precisely aligned with the zero point of the arc scale line 18, laying the foundation for subsequent accurate testing. At the same time, it can be adapted to test tubes 2 and samples of different heights, improving the versatility of the equipment.

[0037] Refer to the instruction manual appendix Figure 4 and Figure 5 The test tube 2 is fixedly connected to the outer side of the upper end with an external threaded ring 24, and the cap 3 is fixedly connected to the outer side with an external threaded ring 25. The external threads of the external threaded ring 24 and the external threaded ring 25 are connected to the outer threads of an internal threaded connecting sleeve 26.

[0038] It should be noted that the external threaded ring 24 on the outer side of the upper end of test tube 2 and the external threaded ring 25 on the outer side of cap 3 have the same specifications and both adopt a fine thread design. Fine thread has the characteristics of good sealing performance and firm connection, which can enhance the sealing performance of the connection between test tube 2 and cap 3. The inner threaded connecting sleeve 26 has an internal thread that matches the external threaded ring 24 and external threaded ring 25. By simultaneously screwing the inner threaded connecting sleeve 26 onto the outer side of external threaded ring 24 and external threaded ring 25, test tube 2 and cap 3 can be firmly locked, realizing a sealed connection between the two, preventing the leakage of protective gas in test tube 2 during heating, and preventing outside air from entering and causing oxidation of the magnesium carbon brick sample, thus ensuring the authenticity of the test data.

[0039] Refer to the instruction manual appendix Figure 4 and Figure 5 The bottom of the external threaded ring 24 is fixedly connected to the positioning ring 27, and the positioning ring 27 is fixedly connected to the outside of the test tube 2. The top of the external threaded ring 25 is fixedly connected to the positioning ring 28, and the positioning ring 28 is fixedly connected to the outside of the cap 3.

[0040] It should be noted that the positioning ring 27 at the bottom of the external threaded ring 24 is fixedly connected to the outside of the test tube 2. The diameter of the positioning ring 27 is larger than that of the external threaded ring 24. It can limit the lower end of the internal threaded connecting sleeve 26, preventing the internal threaded connecting sleeve 26 from being over-screwed, which would cause the sealing plug 4 to excessively squeeze the sample inside the test tube 2, resulting in sample deformation or damage. The positioning ring 28 at the top of the external threaded ring 25 is fixedly connected to the outside of the cap 3. Its diameter is larger than that of the external threaded ring 25. It can limit the upper end of the internal threaded connecting sleeve 26. At the same time, it can ensure the coaxiality of the test tube 2 and the cap 3 after the internal threaded connecting sleeve 26 is screwed in, avoiding the sealing plug 4 from shifting and causing sealing failure, thus further improving the sealing reliability of the equipment.

[0041] Refer to the instruction manual appendix Figure 3 Two fixed plates 29 are fixedly connected to the upper end of the test chamber 1. Two movable frames 30 are set on the top of the test chamber 1. Two pressure plates 10 are set on the upper end of the cover 3. A set of pressing drive mechanisms is installed on each of the two movable frames 30. The output end of each set of pressing drive mechanisms is connected to a corresponding pressure plate 10. The pressing drive mechanism is used to drive the pressure plate 10 to move up and down. A position adjustment mechanism is installed on the two fixed plates 29. The output end of the position adjustment mechanism is connected to the two movable frames 30. The position adjustment mechanism is used to drive the two movable frames 30 to move closer or farther away from each other.

[0042] It should be noted that the two fixed plates 29 at the top of the test chamber 1 are fixed by welding, providing a stable mounting carrier for the position adjustment mechanism. The two movable frames 30 are symmetrically arranged below the display panel 13 and can move flexibly in the horizontal direction. The pressure plate 10 at the top of them is used to press the cap 3. Each set of pressing drive mechanism can independently drive the corresponding pressure plate 10 to rise and fall, realizing the pressing and loosening of the cap 3. The position adjustment mechanism can drive the two movable frames 30 to move closer or further apart, ensuring that the pressure plate 10 can accurately act on both sides of the cap 3. Through the cooperation of the position adjustment mechanism and the pressing drive mechanism, the cap 3 can be firmly pressed onto the test tube 2, preventing the cap 3 from loosening or failing to seal due to equipment vibration or sample expansion during heating, thus ensuring the stability of the testing process.

[0043] Refer to the instruction manual appendix Figure 3 Each set of pressing drive mechanisms includes a threaded rod 701 rotatably connected to the inner side of the movable frame 30, a lifting plate 702 threadedly connected to the outer side of the threaded rod 701, and a knob 703 rotatably mounted on the outer side. The lifting plate 702 is fixedly connected to the corresponding pressure plate 10, and the knob 703 is fixedly connected to the threaded rod 701 through a shaft.

[0044] It should be noted that the threaded rod 701 in each set of clamping drive mechanisms adopts fine thread and is rotatably connected to the inner side of the moving frame 30. The lifting plate 702 on its outer side is threadedly connected to the threaded rod 701, and the lifting plate 702 is slidably engaged with the inner side of the moving frame 30 to prevent the lifting plate 702 from rotating synchronously with the threaded rod 701, thereby realizing the vertical lifting of the lifting plate 702. The knob 703 on the outer side of the moving frame 30 is fixedly connected to the threaded rod 701 through a shaft. The operator can rotate the knob 703 to drive the threaded rod 701 to rotate, thereby driving the lifting plate 702 to lift synchronously with the pressure plate 10. The surface of the knob 703 is provided with anti-slip texture, which makes it easy for the operator to apply force. At the same time, the fine thread design can realize the fine adjustment of the clamping force of the pressure plate 10, avoiding excessive pressure that could damage the cap 3 or the sample.

[0045] Refer to the instruction manual appendix Figure 3 The position adjustment mechanism includes a bidirectional screw 801 rotatably connected between two fixed plates 29, a movable plate 802 symmetrically threaded to both ends of the outer side of the bidirectional screw 801, and a knob 803 rotatably connected to one of the fixed plates 29. The two movable plates 802 are respectively fixedly connected to two movable frames 30, and the knob 803 is fixedly connected to the bidirectional screw 801 through a shaft.

[0046] It should be noted that the bidirectional screw 801 in the position adjustment mechanism is rotatably connected between two fixed plates 29, and its two ends are provided with threads with opposite directions of rotation. The two moving plates 802 are respectively symmetrically threaded to the two ends of the bidirectional screw 801, and the moving plates 802 are slidably engaged with the upper end of the test chamber 1 to ensure that the moving plates 802 can move smoothly along the axial direction of the bidirectional screw 801. The knob 803 on one of the fixed plates 29 is fixedly connected to the bidirectional screw 801 through a shaft. Rotating the knob 803 can drive the bidirectional screw 801 to rotate synchronously. Since the threads at both ends of the bidirectional screw 801 rotate in opposite directions, it can drive the two moving plates 802 to move closer or further away synchronously, thereby driving the two moving frames 30 to move synchronously, realizing the precise adjustment of the position of the pressure plate 10. The adjustment process has good synchronization, high precision, and convenient operation.

[0047] Working principle:

[0048] I. Pre-test preparation: Place the magnesia-carbon brick sample into test tube 2, cover it with cap 3 to seal test tube 2 with plug 4, rotate the internal threaded connecting sleeve 26 to engage with external threaded ring 1 24 and external threaded ring 25, and use positioning ring 1 27 and positioning ring 28 to limit the movement, thus completing the sealing and fixation of test tube 2 and cap 3; insert the lightweight floating needle 5 through cap 3 and plug 4, so that its bottom slightly abuts the top surface of the sample, and then insert test tube 2 into test chamber 1; start cylinder 11 to drive support base 12 and display The indicator 13 is raised and lowered until the horizontal line 19 of the X-axis is level with the upper end of the support bar 6 and then fixed. The driving plate 9 is placed on the support bar 6 and limited by the magnetic plate 22 and the magnetic block 21. The rotating ring 15 is adjusted so that the pointer 16 is aligned with the zero point of the arc-shaped scale line 18. The knob 2 803 is turned, and the two moving frames 30 are driven to approach the cover 3 through the bidirectional screw 801 and the moving plate 802. The knob 1 703 is turned, and the pressure plate 10 is driven to press the cover 3 through the threaded rod 701 and the lifting plate 702, thus completing the preparation.

[0049] II. Thermal Expansion Test: The heating component of the test chamber 1 is activated, and the sample in the test tube 2 expands due to heat, which lifts the light floating needle 5 and generates a vertical displacement Δh. The support bar 6 drives the driving plate 9 to rise, pulling the connecting plate 17 to make the rotating ring 15 rotate around the positioning column 14. Based on the principle of similar triangles (the ratio of the horizontal distance from the support point to the pointer end to the positioning column 14 is 1:5), the displacement of the pointer 16 end is magnified by 5 times. The amount of sample expansion and its trend can be read intuitively through the arc-shaped scale line 18 indicated by the pointer 16.

[0050] III. Test Completion: Turn off the heating components and wait for test tube 2 and the sample to cool to room temperature; remove the magnetic suction plate 22, and rotate knob 703 and knob 803 in the opposite direction to reset the pressure plate 10 and the moving frame 30; remove the lightweight floating needle 5, unscrew the internal threaded connecting sleeve 26, open the cap 3, remove test tube 2 and the sample, clean all parts and reset them to complete the test.

[0051] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A thermal expansion apparatus for the production of magnesia-carbon bricks, characterized in that: Includes a test chamber (1), a test tube (2) that is movably inserted into the test chamber (1), a cap (3) that is placed on the test tube (2), a sealing plug (4) that is fixedly connected to the bottom of the cap (3) and inserted into the inside of the test tube (2), a lightweight floating needle (5) that movably passes through the cap (3) and the sealing plug (4), a support bar (6) that is fixedly connected to the top of the lightweight floating needle (5), a drive plate (9) that is placed on the top of the support bar (6), a display panel (13) that is placed above the test chamber (1), and a fixed... The positioning post (14) is connected to the center of the front side of the display disk (13), the rotating ring (15) is movably connected to the outside of the positioning post (14), the pointer (16) is fixedly connected to one side of the rotating ring (15), the connecting plate (17) is fixedly connected to the other side of the rotating ring (15), and the arc-shaped scale line (18) is set at the outer edge of the display disk (13). The side of the connecting plate (17) away from the rotating ring (15) is fixedly connected to the driving plate (9), and the driving plate (9) and the pointer (16) are set on the same axis.

2. The thermal expansion apparatus for magnesia-carbon brick production according to claim 1, characterized in that: The surface of the display panel (13) is provided with an X-axis horizontal line (19) and a Y-axis vertical line (20), which are perpendicular to each other. The distance between the support bar (6) and the support position point of the drive plate (9) and the center axis of the positioning post (14) is set to one-fifth of the distance between the end of the pointer (16) and the center axis of the positioning post (14).

3. The thermal expansion apparatus for magnesia-carbon brick production according to claim 1, characterized in that: The upper ends of the support bar (6) are fixedly connected to magnetic blocks (21), and the drive plate (9) is movably set between the two magnetic blocks (21). The upper ends of the two magnetic blocks (21) are attached to magnetic plates (22), and the upper ends of the magnetic plates (22) are fixedly connected to handles (23).

4. The thermal expansion apparatus for magnesia-carbon brick production according to claim 1, characterized in that: A cylinder (11) is fixedly installed on the upper end of the test box (1). A support base (12) is fixedly connected to the output end of the cylinder (11). The cylinder (11) is used to drive the support base (12) to move up and down. The support base (12) is fixedly connected to the display panel (13).

5. A thermal expansion apparatus for producing magnesia-carbon bricks according to claim 1, characterized in that: The test tube (2) is fixedly connected to the outer side of the upper end with an external threaded ring one (24), and the outer side of the cap (3) is fixedly connected with an external threaded ring two (25). The outer threads of the external threaded ring one (24) and the external threaded ring two (25) are connected with an internal threaded connecting sleeve (26).

6. A thermal expansion apparatus for producing magnesia-carbon bricks according to claim 5, characterized in that: The bottom of the external threaded ring 1 (24) is fixedly connected to the positioning ring 1 (27), and the positioning ring 1 (27) is fixedly connected to the outside of the test tube (2). The top of the external threaded ring 2 (25) is fixedly connected to the positioning ring 2 (28), and the positioning ring 2 (28) is fixedly connected to the outside of the cap (3).

7. A thermal expansion apparatus for producing magnesia-carbon bricks according to claim 1, characterized in that: Two fixed plates (29) are fixedly connected to the upper end of the test box (1). Two movable frames (30) are set above the test box (1). Two pressure plates (10) are set at the upper end of the cover (3). A set of pressing drive mechanisms is installed on each of the two movable frames (30). The output end of each set of pressing drive mechanisms is connected to a corresponding pressure plate (10). The pressing drive mechanism is used to drive the pressure plate (10) to move up and down. A position adjustment mechanism is installed on the two fixed plates (29). The output end of the position adjustment mechanism is connected to the two movable frames (30). The position adjustment mechanism is used to drive the two movable frames (30) to move closer or further apart.

8. A thermal expansion apparatus for producing magnesia-carbon bricks according to claim 7, characterized in that: Each set of pressing drive mechanisms includes a threaded rod (701) rotatably connected to the inside of the movable frame (30), a lifting plate (702) rotatably connected to the outside of the threaded rod (701), and a knob (703) rotatably mounted on the outside. The lifting plate (702) is fixedly connected to the corresponding pressure plate (10), and the knob (703) is fixedly connected to the threaded rod (701) through a shaft.

9. A thermal expansion apparatus for producing magnesia-carbon bricks according to claim 7, characterized in that: The position adjustment mechanism includes a bidirectional screw (801) rotatably connected between two fixed plates (29), a movable plate (802) symmetrically threaded to both ends of the outer side of the bidirectional screw (801), and a knob (803) rotatably connected to one of the fixed plates (29). The two movable plates (802) are fixedly connected to two movable frames (30) respectively, and the knob (803) is fixedly connected to the bidirectional screw (801) through a shaft.

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