Device and method for a specimen used in a creep rate test of a formed refractory mortar

Abstract

The present invention discloses a device for testing specimens of the creep rate of formed refractory mortar, which includes a base, a central column, side columns, a support structure, and a positioning structure. The same number of positioning structures are provided on the side columns, and positioning pieces are provided on the positioning structures. Part of the movement trajectory of the positioning piece falls above the refractory brick thin plate. By arranging side columns, vertically sliding positioning structures, and horizontally sliding positioning pieces on the periphery of the refractory brick thin plate, the height of the positioning piece is consistent with the thickness of the refractory mortar to be laid. When making test blocks, first place the positioning piece on the lower refractory brick thin plate, then lay refractory mortar thicker than the height of the positioning piece on the upper surface of the refractory brick thin plate and place a new refractory brick thin plate on the upper part of the mortar. Finally, by rotating and extruding the upper refractory brick thin plate, the upper and lower ends of the positioning piece are respectively attached to the two refractory brick thin plates. Through the positioning piece, the thickness of each layer of refractory mortar is precisely controlled, so as to precisely control the total thickness of the specimen.

Description

Technical Field

[0001] The present invention relates to the technical field of refractory material testing, and particularly relates to a device and method for testing the creep rate of a formed refractory mortar sample. Background Art

[0002] Refractory mortar is the basic material for refractory masonry in industrial furnaces. It is filled between brick joints to bond refractory bricks into a whole. During the entire service life cycle, under the combined action of high temperature and load, refractory mortar and refractory bricks undergo certain deformation over time, changing the masonry structure. In severe cases, it will affect the safe use of the masonry and even cause safety accidents. Therefore, it is of great practical significance to detect the creep rate of refractory mortar.

[0003] In German standard DIN 1089, a test method for the creep rate of refractory mortar is mentioned. Two refractory brick specimens with a diameter of 50 mm, a thickness of 22.5 mm, and a central through-hole diameter of 12 - 13 mm are bonded with 5-mm-thick refractory mortar into a cylindrical specimen with a height of 50 mm for creep rate testing. However, in actual operation, it is difficult to bond the upper and lower refractory bricks parallel, and the thickness of the mortar in the same layer is uneven; it is difficult to align the central holes and they are prone to vertical misalignment; and during the forming process, the refractory mortar is not kneaded and extruded, making it difficult to be dense. Due to the above defects, it is extremely easy to lead to test failure; and it is easy for the specimen to be bonded skewed and misaligned, resulting in uneven deformation of the mortar during the test and breaking of the central thermocouple sleeve, causing inaccurate testing or equipment damage. Summary of the Invention

[0004] In view of the above-mentioned defects existing in the prior art, a device and method for testing the creep rate of a formed refractory mortar sample are provided, which can accurately control the thickness of each layer of refractory mortar, thereby accurately controlling the total thickness of the sample.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A device for testing the creep rate of a formed refractory mortar sample, characterized in that it includes

[0007] A base, the base adopts a panel structure with a horizontal upper surface;

[0008] A central column, the central column is vertically arranged in the middle of the upper surface of the base;

[0009] Side columns, several side columns are arranged at intervals on the upper surface of the base. The side columns and the central column are arranged parallel to each other, and the side columns are located on a circle with the central column as the center and a certain length as the radius; a refractory brick thin plate is placed on the base, the central column passes through the through-hole in the middle of the refractory brick thin plate, and the refractory brick thin plate is located between the central column and the side columns;

[0010] Support structure, the support structure is arranged on the central column, the outer ring of the support structure abuts against the inner wall of the through hole of the refractory brick sheet, and under the action of the support structure, the center of the refractory brick sheet falls on the central column;

[0011] Positioning structure, the same number of positioning structures are arranged on each side column, the positioning structure is arranged on the side column in a connection mode that can only slide up and down, a positioning piece is arranged on the positioning structure, the positioning piece is arranged on the positioning structure in a linear sliding mode of approaching or departing from the central column, a part of the movement track of the positioning piece falls above the refractory brick sheet, and the thickness of the positioning piece is designed according to the thickness of each layer of refractory mortar.

[0012] According to the above technical solution, the side columns are arranged at equal intervals on a circumference with the central column as the center and a certain length as the radius, and the number of side columns is at least 3.

[0013] According to the above technical solution, the side column adopts a regular prism, the positioning structure adopts a tubular structure, and the shape and size of the inner wall of the positioning structure match the shape and size of the outer wall of the side column; a slider with a wide outer side and a narrow inner side is fixedly arranged on the side wall of the positioning structure, a horizontal chute matching the slider is arranged on the side surface of the positioning piece adjacent to the side column, and the position of the slider is designed so that the positioning piece moves towards the central column.

[0014] According to the above technical solution, the support structure includes a fixed bushing, a sliding bushing member and a support rod member, the fixed bushing is fixedly arranged at the bottom of the central column, the sliding bushing member is sleeved on the central column in a connection mode of sliding up and down, and the length of the sliding bushing member is greater than the cumulative height of all refractory brick sheets; a plurality of support rod members are arranged at circumferential intervals on the sliding bushing member and the fixed bushing; a vertical positioning rod is arranged inside the support rod member, and under the action of the support rod member, the vertical positioning rod fits on the inner wall of the through hole of the refractory brick sheet, and the vertical positioning rod and the central rod are kept parallel to each other.

[0015] According to the above technical solution, the support rod members are arranged at circumferential equal intervals on the sliding bushing member and the fixed bushing; the number of support rod members is at least 3.

[0016] According to the above technical solution, the central column adopts a circular column structure or a regular prism structure.

[0017] According to the above technical solution, the support rod member further includes a first support rod, a second support rod, and a third support rod; both ends of the first and second support rods are respectively hinged to the vertical positioning rod and the sliding bushing member. The first support rod, the second support rod, the part of the vertical positioning rod between the first support rod and the second support rod, and the part of the sliding bushing member between the first support rod and the second support rod form a parallelogram mechanism; the first support rod and the second support rod are always in an inclined state with the end connected to the sliding bushing member being high and the end connected to the vertical positioning rod being low; one end of the third support rod is hinged to the fixed bushing, and the other end of the third support rod is hinged to the vertical positioning rod, and the third support rod is always in an inclined state with the end connected to the vertical positioning rod being high and the end connected to the fixed bushing being low.

[0018] According to the above technical solution, the sliding bushing member adopts a sleeve structure, the inner cavity of the sleeve matches the shape of the central rod, and one end of the first and second support rods is hinged to the outer wall of the sleeve structure; alternatively, the sliding bushing member includes a plurality of sliding bushings and a sliding bushing lifting rod. The plurality of sliding bushings slide up and down on the central column, the sliding bushing lifting rod is fixedly connected to the plurality of sliding bushings, the sliding bushing lifting rod and the central column are arranged in parallel, and the first support rod of all support rod members is hinged to the same sliding bushing, and the second support rod of all support rod members is simultaneously hinged to another sliding bushing.

[0019] According to the above technical solution, when the support structure is unfolded, the distance from the lower end of the vertical positioning rod to the base is less than a certain size, and this size is determined according to the size of the refractory brick flakes.

[0020] A method for forming a specimen for testing the creep rate of shaped refractory mortar, characterized in that: using the device for forming a specimen for testing the creep rate of shaped refractory mortar as described above; including the following steps:

[0021] S1: Pass the refractory brick disc through the central through hole of the central column and place it flat on the base; press down the lifting rod of the sliding bushing of the support structure to unfold the support structure and make the refractory brick disc concentric with the central column;

[0022] S2: Install a positioning structure on each side column and make the positioning piece face the direction of the central column. Adjust the position of the positioning structure and the positioning piece so that the positioning piece contacts the upper surface of the refractory brick disc and penetrates a certain distance inside the circumference of the disc;

[0023] S3: Apply the stirred refractory mortar on the upper surface of the refractory brick disc, and the thickness of the refractory mortar should exceed the height of the positioning piece;

[0024] S4: Place a new round refractory brick on top of the refractory mortar. Rotate and knead the refractory brick so that the upper edge of the new refractory brick disc contacts the upper edge of the positioning piece. Repeat steps S2 - S3 until the height of the test block reaches the set value, and remove the excess refractory mortar squeezed out by the rotation and kneading around the test block.

[0025] S5: After the refractory mortar starts to set, pull out the positioning piece and lift the lifting rod of the sliding bushing so that the vertical rod of the support structure disengages from the refractory mortar and the refractory brick masonry test block. After removing the test block, remove the remaining refractory mortar in the central hole, and then dry it to prepare a specimen for the refractory mortar creep rate test.

[0026] The present invention has the following beneficial effects:

[0027] 1. By arranging side columns, a positioning structure that slides up and down, and a positioning piece that slides horizontally on the periphery of the refractory brick sheet, the height of the positioning piece is the same as the thickness of the refractory mortar to be laid. When making the test block, first place the positioning piece on the lower refractory brick sheet, then lay refractory mortar thicker than the height of the positioning piece on the upper surface of the refractory brick sheet and place a new refractory brick sheet on top of the mortar. Finally, rotate and squeeze the upper refractory brick sheet, so that the upper and lower ends of the positioning piece are respectively attached to the two refractory brick sheets. Through the positioning piece, the thickness of each layer of refractory mortar is accurately controlled, thus accurately controlling the total thickness of the specimen.

[0028] 2. Since multiple positioning pieces are arranged between two adjacent upper and lower refractory brick sheets, it ensures that the thickness between two adjacent upper and lower refractory brick sheets is the same, so that the upper and lower surfaces of each layer of refractory brick and each layer of refractory mortar are parallel, avoiding uneven deformation due to uneven thickness of the mortar along the circumference of the specimen during the test, resulting in uneven deformation and tilting of the test block.

[0029] 3. By designing the side columns as prismatic shapes, the positioning structure can only move up and down, cannot move left and right or rotate. During molding, the refractory brick can be rotated and kneaded, and the refractory mortar can be rotated and squeezed to make the mortar dense and full; the positioning piece will not move left and right to damage the mortar layer.

[0030] 4. The positioning structure can move up and down to adapt to the molding of test blocks of refractory brick sheets with different thicknesses.

[0031] 5. The positioning piece can approach or move away from the central column in the positioning structure. When approaching, it plays a positioning role, and when moving away, it is convenient to take out the molded specimen. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of an embodiment provided by the present invention;

[0033] Figure 2 is a top view of Embodiment 1 of the embodiment provided by the present invention;

[0034] Figure 3It is the top view of Embodiment 2 of the embodiments provided by the present invention;

[0035] In the figure, 1 is the base; 2 is the central column; 3 is the support structure; 301 is the upper sliding bushing; 302 is the lower sliding bushing; 303 is the fixed bushing; 304 is the first support rod; 305 is the second support rod; 306 is the third support rod; 307 is the vertical positioning rod; 308 is the sliding bushing lifting rod; 4 is the side column; 5 is the positioning structure; 501 is the positioning piece. Detailed implementation manners

[0036] The present invention will be described in detail below with reference to the drawings and embodiments.

[0037] Refer to Figures 1 to 3 As shown, a device for testing the creep rate of a formed refractory mud sample provided by the present invention includes a base 1, and the base adopts a panel structure with a horizontal upper surface;

[0038] A central column 2, which is vertically arranged in the middle of the upper surface of the base;

[0039] Side columns 4, several side columns are arranged at intervals on the upper surface of the base. The side columns and the central column are arranged in parallel, and the side columns are located on a circle with the central column as the center and a certain length as the radius; the refractory brick thin plate is placed on the base, the central column passes through the through hole in the middle of the refractory brick thin plate, and the refractory brick thin plate is located between the central column and the side columns;

[0040] A support structure 3, which is arranged on the central column, and the outer ring of the support structure abuts against the inner wall of the through hole of the refractory brick thin plate. Under the action of the support structure, the center of the refractory brick thin plate falls on the central column;

[0041] A positioning structure 5, the same number of positioning structures are provided on each side column. The positioning structure is connected to the side column in a manner that can only slide up and down. A positioning piece 501 is provided on the positioning structure. The positioning piece is arranged on the positioning structure in a linear sliding manner of approaching or moving away from the central column. Part of the movement track of the positioning piece falls above the refractory brick thin plate, and the thickness of the positioning piece is designed according to the thickness of each layer of refractory mud.

[0042] Further, the side columns are arranged at equal intervals on a circle with the central column as the center and a certain length as the radius, and the number of side columns is at least 3. Preferably, the number of side columns is 3 or 4.

[0043] Preferably, the side columns adopt regular prisms, the positioning structures adopt tubular structures, and the shape and size of the inner wall of the positioning structure match the shape and size of the outer wall of the side columns; a slider with a wide outer side and a narrow inner side is fixedly provided on the side wall of the positioning structure. A horizontal chute matching the slider is provided on the side surface of the positioning piece adjacent to the side column, and the position of the slider is designed such that the positioning piece moves towards the central column.

[0044] Specifically, the support structure includes a fixed bushing 303, a sliding bushing member, and a support rod member. The fixed bushing is fixedly provided at the bottom of the central column. The sliding bushing member is sleeved on the central column in a vertically slidable connection manner, and the length of the sliding bushing member is greater than the cumulative height of all refractory brick flakes. A plurality of support rod members are circumferentially spaced between the sliding bushing member and the fixed bushing. A vertical positioning rod 307 is provided inside the support rod member. Under the action of the support rod member, the vertical positioning rod fits against the inner wall of the through hole of the refractory brick flake, and the vertical positioning rod and the central rod are kept parallel to each other.

[0045] Furthermore, the support rod members are circumferentially equally spaced between the sliding bushing member and the fixed bushing; the number of support rod members is at least 3.

[0046] Preferably, the central column adopts a circular column structure or a regular prism structure.

[0047] Specifically, the support rod member further includes a first support rod 304, a second support rod 305, and a third support rod 306. The two ends of the first and second support rods are respectively hinged to the vertical positioning rod and the sliding bushing member. The first support rod, the second support rod, the part of the vertical positioning rod between the first support rod and the second support rod, and the part of the sliding bushing member between the first support rod and the second support rod form a parallelogram mechanism. The first support rod and the second support rod are always in an inclined state with the end connected to the sliding bushing member being high and the end connected to the vertical positioning rod being low. One end of the third support rod is hinged to the fixed bushing, and the other end of the third support rod is hinged to the vertical positioning rod, and the third support rod is always in an inclined state with the end connected to the vertical positioning rod being high and the end connected to the fixed bushing being low.

[0048] Specifically, the sliding bushing member adopts a sleeve structure, the inner cavity of the sleeve matches the shape of the central rod, and one end of the first and second support rods is hinged to the outer wall of the sleeve structure; or, the sliding bushing member includes a plurality of sliding bushings (two sliding bushings are selected in the embodiment in the figure, namely the upper sliding bushing 301 and the lower sliding bushing 302), and a sliding bushing lifting rod 308. The plurality of sliding bushings are sleeved on the central column and slide up and down. The sliding bushing lifting rod is fixedly connected to the plurality of sliding bushings, and the sliding bushing lifting rod and the central column are arranged in parallel. The first support rods of all support rod members are hinged to the same sliding bushing, and the second support rods of all support rod members are simultaneously hinged to another sliding bushing.

[0049] Furthermore, when the support structure is unfolded, the distance from the lower end of the vertical positioning rod to the base is less than a certain size, and this size is determined according to the size of the refractory brick flake.

[0050] A method for preparing a specimen for the creep rate test of shaped refractory mortar, characterized in that: using the device for preparing a specimen for the creep rate test of shaped refractory mortar as described above; comprising the following steps:

[0051] S1: Pass the refractory brick disc through the central through-hole of the central column and place it flat on the base; press down the lifting rod of the sliding sleeve of the support structure to expand the support structure and make the refractory brick disc concentric with the central column;

[0052] S2: Install a positioning structure on each side column and make the positioning piece face the direction of the central column. Adjust the positions of the positioning structure and the positioning piece so that the positioning piece contacts the upper surface of the refractory brick disc and penetrates a certain distance inside the circumference of the disc;

[0053] S3: Apply the well-stirred refractory mortar on the upper surface of the refractory brick disc, and the thickness of the refractory mortar should exceed the height of the positioning piece;

[0054] S4: Place a new refractory brick disc on top of the refractory mortar, rotate and knead the refractory brick so that the new refractory brick disc touches the upper edge of the positioning piece, and repeat steps S2 - S3 until the height of the test block reaches the set value, and remove the excess refractory mortar extruded by kneading, rotating and squeezing around the test block;

[0055] S5: After the refractory mortar starts to set, pull out the positioning piece and lift the lifting rod of the sliding sleeve to separate the vertical rod of the support structure from the refractory mortar and the refractory brick masonry test block. After taking out the test block, remove the residual refractory mortar in the central hole, and then dry it to prepare a specimen for the creep rate test of refractory mortar.

[0056] Based on the above-mentioned multiple types of embodiments, two specific embodiments are as follows:

[0057] Embodiment 1

[0058] The base is a steel disc with a diameter of 60 mm, and a central column perpendicular to the disc surface is fixed at the center of the base 1; a support structure is installed on the central column; there are side columns parallel to the central column distributed at intervals of 120° on the circumference 28 mm away from the center of the base; the side columns are regular prisms with a size of 3 mm × 3 mm × 50 mm, and each side column is equipped with 2 positioning structures along the height direction, and each positioning structure is equipped with a positioning piece with a height of 4 mm, a width of 1 mm and a length of 10 mm. The positioning structure can be installed or removed from the top of the side column and can slide up and down along the side column. The positioning piece can move closer to or away from the central column.

[0059] The central column is a steel cylinder with a diameter of 2 mm and a height of 60 mm. A fixed sleeve is fixed near the base of the central column. Above the fixed sleeve, a lower sliding sleeve and an upper sliding sleeve are installed in sequence from bottom to top. The upper sliding sleeve and the lower sliding sleeve are connected by a sliding sleeve lifting rod, and the distance between the lower sliding sleeve and the lower sliding sleeve is 20 mm; the sliding sleeve lifting rod has a diameter of 1 mm and a length of 50 mm.

[0060] Along the circumference of the cross-section of the central column, there is a set of support rod members at intervals of 120°. Each set of support rod members consists of a vertical positioning rod, a first support rod, a second support rod, and a third support rod. The two ends of the first support rod are respectively hinged to the corresponding vertical positioning rod and the upper sliding bushing; the two ends of the second support rod are respectively hinged to the corresponding vertical positioning rod and the lower sliding bushing; the first support rod and the second support rod are of equal length, approximately 5 mm; the first support rod, the second support rod, the central column, and the vertical positioning rod form a parallelogram. The two ends of the third support rod are respectively hinged to the vertical positioning rod and the fixed bushing; the third support rod is approximately 5 mm long. The first support rod and the second support rod are always in an inclined state with the end connected to the sliding bushing member being high and the end connected to the vertical positioning rod being low; one end of the third support rod is hinged to the fixed bushing, and the other end of the third support rod is hinged to the vertical positioning rod, and the third support rod is always in an inclined state with the end connected to the vertical positioning rod being high and the end connected to the fixed bushing being low.

[0061] The vertical positioning rod has a diameter of 1 mm and a length of approximately 60 mm. When the support structure is deployed, the distance from the lower end of the vertical positioning rod to the base is less than 2 mm.

[0062] Embodiment 2

[0063] The base is a steel disc with a diameter of 60 mm. A central column perpendicular to the circular surface is fixed at the center of the base; a support structure is installed on the central column; on the circumference of the base, 90° apart from the center of the circle at a distance of 28 mm, there are side columns parallel to the central column; the side columns are regular prisms with dimensions of 2 mm × 2 mm × 50 mm. Along the height direction of each side column, there is a positioning structure, and each positioning structure is equipped with a positioning piece that is 5 mm high, 1 mm wide, and 10 mm long. The positioning structure can be installed or removed from the top of the side column and can slide up and down along the side column. The positioning piece can move closer to or farther away from the central column.

[0064] The central column is a regular prism with dimensions of 2 mm × 2 mm × 80 mm. A fixed bushing is fixed at a position 25 mm from the bottom end of the central column. Above and below the fixed bushing, an upper sliding bushing and a lower sliding bushing are respectively installed. A sliding bushing lifting rod is vertically fixed on the upper sliding bushing, with a diameter of 1 mm and a length of 50 mm.

[0065] On each of the four sides of the central column, there is a set of support rod members. Each set of support rod members consists of a vertical positioning rod, a first support rod, a second support rod, and a third support rod. The two ends of the first support rod are respectively hinged to the corresponding vertical positioning rod and the upper sliding bushing; the two ends of the second support rod are respectively hinged to the corresponding vertical positioning rod and the lower sliding bushing; the first support rod and the second support rod are of equal length, approximately 5 mm; the first support rod, the second support rod, the central column, and the vertical positioning rod form a parallelogram structure; the two ends of the third support rod are respectively hinged to the vertical positioning rod and the fixed bushing; the third support rod is approximately 5 mm long. The first support rod and the second support rod are always in an inclined state with the end connected to the sliding bushing member at a higher level and the end connected to the vertical positioning rod at a lower level; one end of the third support rod is hinged to the fixed bushing, and the other end of the third support rod is hinged to the vertical positioning rod, and the third support rod is always in an inclined state with the end connected to the vertical positioning rod at a higher level and the end connected to the fixed bushing at a lower level.

[0066] The vertical positioning rod has a diameter of 1 mm and a length of approximately 60 mm. When the support structure is deployed, the distance from the lower end of the vertical positioning rod to the base is less than 2 mm.

[0067] For a specimen forming device for testing the creep rate of refractory mortar based on the above embodiment, the test is carried out according to the following steps:

[0068] a) Pass a refractory brick disc with an outer diameter of 50 mm, a thickness of 6 mm, and a central through-hole diameter of 14 mm through the central column from the central through-hole and place it flat on the base; press down the lifting rod of the sliding bushing of the support structure to deploy the support structure and make the refractory brick disc concentric with the central column.

[0069] b) Install a positioning structure on each side column and make the positioning piece face the direction of the central column. Adjust the positions of the positioning structure and the positioning piece so that the positioning piece contacts the upper surface of the refractory brick disc and penetrates 0.5 mm inside the circumference of the disc.

[0070] c) Apply the stirred refractory mortar on the upper surface of the refractory brick disc, and the thickness of the refractory mortar should exceed the height of the positioning piece.

[0071] d) Place the second refractory brick disc in the manner of step a, rotate and knead the refractory brick so that the second refractory brick disc contacts the upper edge of the positioning piece.

[0072] e) Repeat the operations of b, c, a, b, c... four times to prepare a test block with five layers of refractory brick discs and four layers of refractory mortar spaced apart. The height of the test block is 50 mm. Remove the excess refractory mortar squeezed out by rotation and kneading around the periphery of the test block.

[0073] f) After the refractory mortar starts to set, extract the positioning piece and lift the lifting rod of the sliding bushing to separate the vertical rod of the support structure from the refractory mortar and the refractory brick masonry test block. After removing the test block, remove the residual refractory mortar in the central hole. Then dry it to prepare a specimen for the refractory mortar creep rate test.

[0074] The above are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the protection scope of the present invention.

Claims

1. An apparatus for a specimen used in the creep rate test of a formed refractory mortar, characterized in that: including a base, the base adopting a panel structure with a horizontal upper surface; a central column, the central column being vertically arranged in the middle of the upper surface of the base; side columns, a plurality of side columns being arranged at intervals on the upper surface of the base, the side columns and the central column being arranged parallel to each other, and the side columns falling on a circumference with the central column as the center and a certain length as the radius; refractory brick flakes are placed on the base, the central column passing through a through-hole in the middle of the refractory brick flakes, and the refractory brick flakes being located between the central column and the side columns; a support structure, the support structure being arranged on the central column, the outer ring of the support structure abutting against the inner wall of the through-hole of the refractory brick flakes, and under the action of the support structure, the center of the refractory brick flakes falls on the central column; a positioning structure, the same number of positioning structures being provided on each side column, the positioning structure being arranged on the side column in a connection mode that can only slide up and down, a positioning piece being provided on the positioning structure, the positioning piece being arranged on the positioning structure in a linear sliding mode of approaching or moving away from the central column, a part of the movement track of the positioning piece falling above the refractory brick flakes, and the thickness of the positioning piece being designed according to the thickness of each layer of refractory mud.

2. The device for testing the creep rate of the formed refractory mortar sample according to claim 1, characterized in that: The side columns are arranged at equal intervals on a circumference with the central column as the center and a certain length as the radius, and the number of side columns is at least 3.

3. The device for testing the creep rate of the formed refractory mortar sample according to any one of claims 1-2, characterized in that: The side columns adopt regular prisms, the positioning structure adopts a tubular structure, and the shape and size of the inner wall of the positioning structure match the shape and size of the outer wall of the side columns; a slider with a wide outer side and a narrow inner side is fixedly provided on the side wall of the positioning structure, a horizontal chute matching the slider is provided on the side surface of the positioning piece adjacent to the side column, and the position of the slider is designed such that the positioning piece moves towards the central column.

4. The device for testing the creep rate of the formed refractory mortar sample according to claim 1, characterized in that: The support structure includes a fixed bushing, a sliding bushing member, and a support rod member, the fixed bushing being fixedly arranged at the bottom of the central column, the sliding bushing member being sleeved on the central column in a connection mode of sliding up and down, the length of the sliding bushing member being greater than the cumulative height of all refractory brick flakes; a plurality of support rod members are arranged at circumferential intervals on the sliding bushing member and the fixed bushing; a vertical positioning rod is arranged inside the support rod member, and under the action of the support rod member, the vertical positioning rod fits against the inner wall of the through-hole of the refractory brick flakes, and the vertical positioning rod and the central rod remain parallel to each other.

5. The device for testing the creep rate of the formed refractory mortar sample according to claim 4, characterized in that: The support rod members are arranged at equal circumferential intervals on the sliding bushing member and the fixed bushing; the number of support rod members is at least 3.

6. The device for testing the creep rate of the formed refractory mortar sample according to claim 5, characterized in that: The central column adopts a circular column structure or a regular prism structure.

7. The device for testing the creep rate of the formed refractory mortar sample according to claim 5, characterized in that: The support rod member further includes a first support rod, a second support rod, and a third support rod; both ends of the first and second support rods are respectively hinged to the vertical positioning rod and the sliding bushing member, and the first support rod, the second support rod, the part of the vertical positioning rod between the first support rod and the second support rod, and the part of the sliding bushing member between the first support rod and the second support rod form a parallelogram mechanism; the first support rod and the second support rod are always in an inclined state with the end connected to the sliding bushing member being high and the end connected to the vertical positioning rod being low; one end of the third support rod is hinged to the fixed bushing, the other end of the third support rod is hinged to the vertical positioning rod, and the third support rod is always in an inclined state with the end connected to the vertical positioning rod being high and the end connected to the fixed bushing being low.

8. The device for testing the creep rate of the formed refractory mortar sample according to claim 5, characterized in that: The sliding bushing member adopts a sleeve structure, and the inner cavity of the sleeve matches the shape of the central rod. One ends of the first and second support rods are hinged to the outer wall of the sleeve structure; alternatively, the sliding bushing member includes a plurality of sliding bushings and a sliding bushing lifting rod. The plurality of sliding bushings slide up and down on the central column, and the sliding bushing lifting rod is fixedly connected to the plurality of sliding bushings. The sliding bushing lifting rod and the central column are arranged parallel to each other. The first support rods of all the support rod members are hinged to the same sliding bushing, and the second support rods of all the support rod members are simultaneously hinged to another sliding bushing.

9. The device for testing the creep rate of the shaped refractory mortar sample according to claim 4, characterized in that: When the support structure is deployed, the distance between the lower end of the vertical positioning rod and the base is less than a certain dimension, which is determined according to the dimension of the refractory brick flakes.

10. A method for preparing a specimen for the creep rate test of a shaped refractory mortar, characterized in that: Use the device for testing the creep rate of the formed refractory mortar sample as described in any one of claims 1-9; the method includes the following steps: S1: Pass the refractory brick disc through the central through hole of the central column and place it flat on the base; press down the lifting rod of the sliding bushing of the support structure to deploy the support structure and make the refractory brick disc concentric with the central column. S2: Install a positioning structure on each side column and make the positioning piece face the direction of the central column. Adjust the positions of the positioning structure and the positioning piece so that the positioning piece contacts the upper surface of the refractory brick disc and penetrates a certain distance inside the circumference of the disc. S3: Apply the stirred refractory mortar on the upper surface of the refractory brick disc, and the thickness of the refractory mortar should exceed the height of the positioning piece. S4: Place a new refractory brick disc on the upper part of the refractory mortar, rotate and knead the refractory brick so that the new refractory brick disc contacts the upper edge of the positioning piece. Repeat steps S2-S3 until the height of the test block reaches the set value, and remove the excess refractory mortar extruded by the kneading, rotation and extrusion around the test block. S5: After the refractory mortar begins to set, pull out the positioning piece and lift the lifting rod of the sliding bushing to separate the vertical rod of the support structure from the refractory mortar and the refractory brick masonry test block. After taking out the test block, remove the residual refractory mortar in the central hole, and then dry it to prepare a sample for testing the creep rate of the refractory mortar.

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