A test device for shear strength of slurry bonding joints of refractory specimens at room temperature

Abstract

The present invention relates to a test device for the shear strength of the slurry bonding seam of a refractory material specimen at room temperature. The technical scheme is as follows: a pressure head device (2) is installed at the left end of the upper part of a base (1); a specimen seat plate slide rail (4) fixed to a base bottom plate (3) of the base (1) is movably equipped with a specimen seat plate (5); a pressure head mounting seat (6) is fixed to the left end surface of a horizontal rod of a base column (8), and a specimen clamping device (7) is provided between a vertical rod of the base column (8) and the pressure rod mounting seat (6); an internal thread provided on the upper inner wall of a concave spherical pressure rod (20) of the pressure head device (2) is threadedly connected with an external thread of a cylindrical pressure rod (21), and a screw of a hexagon socket bolt (19) installed in a cylindrical cavity of the concave spherical pressure rod (20) passes through an upper end cover (18) of an adjusting spring, an adjusting spring (17), and a lower end cover (16) of the adjusting spring in sequence, and is threadedly connected with a screw hole of a convex spherical pressure head (15) through a conical through hole. The invention has simple structure, convenient debugging and accurate test results.

Description

Technical Field

[0001] The invention belongs to the technical field of shear strength testing devices, and specifically relates to a testing device for the shear strength of a slurry bonding seam of a refractory material specimen at room temperature. Background Art

[0002] Refractory mud is an indispensable material in the process of building the lining of a high-temperature kiln. Its main function is to bond the refractory bricks to each other, provide overall structural stability for the lining, and prevent molten metal or slag from penetrating into the lining at high temperatures. At the same time, it relieves the thermal stress inside the lining through its own plastic deformation. During the building process and before the furnace is baked, the refractory mud between the refractory bricks will inevitably be subjected to shear stress. At high temperatures, the uneven distribution of thermal stress further increases the shear stress on the refractory mud. Therefore, the shear resistance of the refractory mud, which is determined by testing, is of concern to those skilled in the art.

[0003] The standard method for existing material mechanics shear test is to use a rod-shaped butt joint (such as the US ASTM F1362 standard) or a hollow tubular material butt joint (US ASTM D5448 standard) to bond and then measure the torsional shear strength and torsional shear modulus. If the test piece is suitable and the concentricity is good during loading, the measured result is pure shear stress. However, for refractory materials, it is very difficult to meet the technical conditions for making the above-mentioned samples and testing. It is difficult to make samples for measuring torsional shear strength and torsional shear modulus after making rod-shaped butt joints or hollow tubular materials butt joints and using mud bonding, and a special torque machine is also used to measure the shear stress parallel to the bonding surface, which is obviously difficult to apply in the refractory industry.

[0004] At present, the methods for shear testing of wood and plywood, such as the American ASTM D905 "Standard Test Method for Compression Shear Strength of Adhesive Joints", use adhesive to bond two pieces of wood, and use a test device to test the shear strength of the bonded specimens. Under the action of a press, the device can apply forces of the same magnitude and opposite directions to the two bonded specimens, causing the bonded specimens to deform relatively at the bonding joint, thereby measuring the shear strength of the bonded specimens at the bonding joint. However, when the longitudinal bonding produced by the device during the production of the specimen is not parallel enough, the semicircular movable pressure head in the device can automatically adjust to be parallel to the specimen surface, but when the transverse bonding produced during the production of the specimen is not parallel enough, the semicircular movable pressure head in the device cannot automatically adjust the specimen surface whose transverse bonding is not parallel enough, thereby causing errors in the test results.

[0005] The above method is also related to the failure form of the bonded joint, the thickness of the adhesive and the rigidity of the adherend. Although it is easy to operate, this shear test piece cannot fully represent the shear. When testing the shear strength of the refractory slurry bonded test piece, since the thickness of the slurry joint of the refractory material is 0.5-5mm, it cannot fully meet the requirement that the pure shear stress is the stress generated parallel to the bonding surface.

[0006] At present, there is no testing device and method for the shear resistance of mud bonding strength in the field of refractory material performance testing. Summary of the invention

[0007] The present invention aims to overcome the defects of the prior art and aims to provide a simple-structured test device for testing the shear strength of the mud bonding seam of a refractory specimen at room temperature under the action of a press, which has convenient debugging and accurate test results.

[0008] To achieve the above object, the technical solution adopted by the present invention is:

[0009] The testing device for the shear strength of the mud bonding joint of the refractory specimen at room temperature is composed of a base and a pressure head device, and the pressure head device is installed at the left end of the upper part of the base.

[0010] The base includes a base bottom plate, a specimen seat plate slide rail, a specimen seat plate, a pressure head mounting seat, a specimen clamping device and a base column; the base bottom plate is a rectangular flat plate, and a base column is vertically fixed at the middle position of the right end surface of the base bottom plate; the specimen seat plate slide rail is fixedly installed on the upper plane of the base bottom plate, the right end surface of the specimen seat plate slide rail is close to the left side of the base column, the specimen seat plate slide rail is located in the middle position of the base bottom plate, and the specimen seat plate is movably installed on the specimen seat plate slide rail.

[0011] The base column is an inverted "L"-shaped entity composed of horizontal rods and vertical rods. A pressure head mounting seat is fixed to the left end face of the horizontal rod of the base column. The pressure head mounting seat is square-shaped, and a through hole is provided in the middle position of the pressure head mounting seat. The center line of the through hole is parallel to the center line of the vertical rod of the inverted "L" rod; the horizontal rod of the base column is provided with a specimen clamping device, and the specimen clamping device is located between the vertical rod of the base column and the pressure head mounting seat.

[0012] A specimen seat plate knob is arranged at the lower part of the base column, and the specimen seat plate knob is threadedly connected to the right end face of the specimen seat plate; a specimen adjustment knob is arranged at the middle part of the base column.

[0013] The specimen clamping device is composed of a clamping base, a clamping base cover plate, a clamping screw and a nut; the main body of the clamping screw is a stud, the lower end of the stud and the cylindrical boss form a whole, and the lower surface of the cylindrical boss is a spherical surface.

[0014] The stud of the clamping screw passes through the clamping base cover and is threadedly connected to the screw hole of the horizontal rod of the specimen clamping device. The upper end of the clamping screw is fixedly connected to the nut. The cylindrical boss at the lower end of the clamping screw is movably inserted into the blind hole of the clamping base. The clamping base cover is fixedly connected to the clamping base by screws.

[0015] The pressure head device consists of a cylindrical pressure rod, a concave spherical pressure rod, a hexagon socket bolt, an upper end cover of an adjusting spring, an adjusting spring, a lower end cover of an adjusting spring, a convex spherical pressure head and a reset spring.

[0016] The cylindrical pressure rod is composed of a circular boss, a cylinder and an external threaded section forming a whole with the same center line. The circular boss is located at the upper end of the cylinder, and the external threaded section is located at the lower end of the cylinder; the concave spherical pressure rod is a hollow cylinder, the upper part of the hollow cylinder is a cylindrical cavity, the lower end surface of the hollow cylinder is a concave spherical surface, and the concave spherical surface is connected to the cylindrical cavity through a conical through hole; the hexagon socket bolt is installed in the cylindrical cavity, and the screw of the hexagon socket bolt passes through the upper end cover of the adjusting spring, the adjusting spring, and the lower end cover of the adjusting spring in turn, and is threadedly connected to the screw hole of the convex spherical pressure head through the conical through hole.

[0017] An internal thread is provided on the inner wall of the upper part of the concave spherical pressure rod, and the internal thread is threadedly connected to the external thread section of the cylindrical pressure rod. The outer diameter of the concave spherical pressure rod is the same as the outer diameter of the cylindrical pressure rod. The return spring is sleeved on the cylindrical surfaces of the concave spherical pressure rod and the cylindrical pressure rod. The upper end of the return spring contacts the circular boss of the cylindrical pressure rod, and the lower end of the return spring contacts the upper plane of the pressure head mounting seat.

[0018] The convex spherical indenter is a whole composed of a sphere, a cube and a strip from top to bottom, and the center lines of the sphere, cube and strip are the same straight line. Among them:

[0019] The side length of the cube is 1.1 to 1.2 times the outer diameter of the concave spherical pressure rod;

[0020] The side length l of the strip is equal to the width of the test piece;

[0021] The width b of the strip is 3 to 5 times the thickness of the mud seam of the test piece.

[0022] The right side surface of the strip body of the convex spherical pressure head and the left end surface of the specimen seat plate slide rail are in the same vertical plane.

[0023] A screw hole is vertically arranged at the center of the spherical surface of the spherical body, and the screw hole at the center of the spherical body is threadedly connected with the lower end of the screw rod of the hexagon socket bolt.

[0024] The center lines of the cylindrical pressure rod, the concave spherical pressure rod, the hexagon socket bolt and the convex spherical pressure head are the same straight line, and the concave spherical pressure rod is movably installed in the pressure head mounting seat of the pressure head device.

[0025] The shape of the clamping base is a strip block, and the length × width of the lower plane of the strip block is the same as the placement position of the test piece. Shangping The length and width of the surface are equal The thickness of the strip block is 1.5 to 2 times the height of the cylindrical boss at the lower end of the pressing screw; a blind hole is provided in the middle position of the upper plane of the strip block, and the diameter of the blind hole is 1.1 to 1.2 times the diameter of the cylindrical boss at the lower end of the pressing screw.

[0026] The method of using this test device is:

[0027] Step 1: Move the test device onto the press base, make the center line of the upper ram of the press and the center line of the cylindrical pressure rod of the ram device in the same straight line, and adjust the upper ram of the press to descend to the upper plane of the cylindrical pressure rod of the ram device.

[0028] Step 2: measuring the size of the mud seam of the test piece; the test piece is made by bonding two refractory material test blocks with refractory mud according to GB / T22459.3-2008 standard, and then drying, baking or sintering.

[0029] Step 3: Adjust the specimen seat knob to make the left end surface of the specimen seat flush with the left end surface of the specimen seat slide rail.

[0030] Step 4: Place the test piece on the test piece base plate so that the front and left sides of the test piece are flush with the corresponding surfaces of the test piece base plate; adjust the test piece clamping device so that the test piece clamping device lightly presses the refractory test block on the right side of the test piece.

[0031] Step 5: Adjust the specimen adjustment knob to make the right edge of the mud seam at the upper end of the left test block of the specimen to be tested flush with the left side surface of the convex spherical pressure head strip.

[0032] Step 6: Adjust the specimen clamping device so that it presses the test block on the right side of the test piece.

[0033] Step seven, turn on the press until shear deformation occurs between the mud joint of the test piece and the test block of the test piece; the pressure that causes shear deformation between the two test pieces of the test piece and the mud joint is the shear force on the mud joint of the test piece, and the shear strength of the mud joint of the refractory material test piece at room temperature can be obtained based on the shear force and the size of the test piece.

[0034] Due to the adoption of the above technical solution, the present invention has the following positive effects compared with the prior art:

[0035] The present invention is composed of a base and a convex spherical pressure head device, which is installed in the pressure head installation hole at the upper end of the base, and has a simple structure. After the test piece is placed on the test piece seat plate, the right edge of the mud seam of the test piece is adjusted to be flush with the right side surface of the strip body of the convex spherical pressure head through the test piece seat plate knob and the test piece adjustment knob, and then the right block of the test piece is pressed tightly through the test piece pressing device, which is convenient for debugging.

[0036] The test object of the present invention is the test piece to be tested. Since the mud seam has a certain thickness, and the test pressure does not act directly on the mud seam of the test piece to be tested, but acts on the two test pieces on both sides of the mud seam, the force component generated by the spacing caused by the thickness of the mud seam will cause the upper end of the test piece to be tested to tilt to the left. For this reason, the present invention adopts a test piece clamping device to press tightly on the upper end surface of the test block on the right side of the test piece to be tested, so as to prevent the right test block from tilting to the left due to force. The cylindrical boss at the lower end of the clamping screw of the test piece clamping device is a spherical structure, and the clamping base is pressed tightly on the right test block of the test piece to be tested. When pressurized, the shape deviation caused by the longitudinal and lateral directions when making the test piece to be tested can be automatically adjusted. The spherical movable pressure head can automatically fit the surface of the test block, and can adaptively fit tightly to compress the test block of the test piece to be tested, thereby ensuring the accuracy of the test results.

[0037] The present invention hangs the convex spherical pressure head of the pressure head device on the lower surface of the concave spherical pressure rod, and adjusts the hexagon socket bolt to make the convex spherical pressure head move flexibly within 360 degrees (the rotation range within the direction of 360 degrees is within 5 degrees). The strip body of the convex spherical pressure head overcomes the slight shape deviation caused by the mud seam bonding process of the test piece and can adaptively and closely fit the left test block of the test piece, thereby reducing the test error.

[0038] Therefore, the present invention has a simple structure, and the provided device for testing the shear strength of the mud bonding joint of a refractory material specimen at room temperature has the characteristics of convenient debugging and accurate test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of the present invention;

[0040] Figure 2 yes Figure 1 A schematic diagram of the structure of the middle base 1;

[0041] Figure 3 yes Figure 2 An enlarged schematic diagram of the structure of the test piece clamping device 7;

[0042] Figure 4 yes Figure 3 An enlarged schematic diagram of the AA section;

[0043] Figure 5 yes Figure 1 A schematic diagram of the structure of the medium pressure head device 2;

[0044] Figure 6 yes Figure 5 An enlarged top view of the convex spherical indenter 15;

[0045] Figure 7 Schematic diagram of the appearance of the test object - the test piece 26 of the present invention;

[0046] Figure 8 yes Figure 1 Schematic diagram of usage status. DETAILED DESCRIPTION

[0047] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but is not intended to limit the scope of protection thereof.

[0048] Example 1

[0049] The invention discloses a testing device for the shear strength of the mud bonding joint of a refractory material specimen at room temperature.

[0050] like Figure 1 As shown, the testing device for the shear strength of the mud bonding joint of the refractory specimen at room temperature is composed of a base 1 and a pressure head device 2, and the pressure head device 2 is installed at the left end of the upper part of the base 1.

[0051] like Figure 2 As shown, the base 1 includes a base bottom plate 3, a specimen seat plate slide rail 4, a specimen seat plate 5, a pressure head mounting seat 6, a specimen clamping device 7 and a base column 8; the base bottom plate 3 is a rectangular flat plate, and a base column 8 is vertically fixed at the middle position of the right end surface of the base bottom plate 3; the specimen seat plate slide rail 4 is fixedly installed on the upper plane of the base bottom plate 3, the right end surface of the specimen seat plate slide rail 4 is close to the left side surface of the base column 8, the specimen seat plate slide rail 4 is located in the middle position of the base bottom plate 3, and the specimen seat plate 5 is movably installed on the specimen seat plate slide rail 4.

[0052] like Figure 2 As shown, the base column 8 is an inverted "L"-shaped entity composed of a horizontal rod and a vertical rod, and a pressure head mounting seat 6 is fixed to the left end face of the horizontal rod of the base column 8; the pressure head mounting seat 6 is a square block, and a through hole is provided at the middle position of the pressure head mounting seat 6, and the center line of the through hole is parallel to the center line of the vertical rod of the inverted "L" rod; the horizontal rod of the base column 8 is provided with a specimen clamping device 7, and the specimen clamping device 7 is located between the vertical rod of the base column 8 and the pressure head mounting seat 6.

[0053] like Figure 2 As shown, a specimen seat plate knob 10 is provided at the lower part of the base column 8, and the specimen seat plate knob 10 is threadedly connected to the right end surface of the specimen seat plate 5; a specimen adjustment knob 9 is provided at the middle part of the base column 8.

[0054] like Figure 3 and Figure 4 As shown, the specimen clamping device 7 is composed of a clamping base 11, a clamping base cover plate 12, a clamping screw 13 and a nut 14; the main body of the clamping screw 13 is a stud, the lower end of the stud and the cylindrical boss form a whole, and the lower surface of the cylindrical boss is a spherical surface.

[0055] like Figure 2 , Figure 3 and Figure 4 As shown, the stud of the clamping screw 13 passes through the clamping base cover 12 and is threadedly connected to the screw hole of the horizontal rod of the specimen clamping device 7, the upper end of the clamping screw 13 is fixedly connected to the nut 14, and the cylindrical boss at the lower end of the clamping screw 13 is movably inserted into the blind hole of the clamping base 11, and the clamping base cover 12 is fixedly connected to the clamping base 11 by screws.

[0056] like Figure 5 As shown, the pressure head device 2 is composed of a cylindrical pressure rod 21, a concave spherical pressure rod 20, a hexagon socket bolt 19, an upper end cover 18 of an adjusting spring, an adjusting spring 17, a lower end cover 16 of an adjusting spring, a convex spherical pressure head 15 and a reset spring 22.

[0057] like Figure 5 As shown, the cylindrical pressure rod 21 is composed of a circular boss, a cylinder and an external threaded section forming a whole with the same center line, the circular boss is located at the upper end of the cylinder, and the external threaded section is located at the lower end of the cylinder; the concave spherical pressure rod 20 is a hollow cylinder, the upper part of the hollow cylinder is a cylindrical cavity, the lower end surface of the hollow cylinder is a concave spherical surface, and the concave spherical surface is connected to the cylindrical cavity through a conical through hole; the hexagon socket bolt 19 is installed in the cylindrical cavity, and the screw of the hexagon socket bolt 19 passes through the upper end cover 18 of the adjusting spring, the adjusting spring 17, and the lower end cover 16 of the adjusting spring in sequence and is threadedly connected to the screw hole of the convex spherical pressure head 15 through the conical through hole.

[0058] like Figure 5 and Figure 6 As shown, the inner wall of the upper part of the concave spherical pressure rod 20 is provided with an internal thread, and the internal thread is threadedly connected with the external thread section of the cylindrical pressure rod 21. The outer diameter of the concave spherical pressure rod 20 is the same as the outer diameter of the cylindrical pressure rod 21. The return spring 22 is sleeved on the cylindrical surface of the concave spherical pressure rod 20 and the cylindrical pressure rod 21. Figure 1 , Figure 5 and Figure 8 As shown, the upper end of the return spring 22 contacts the circular boss of the cylindrical pressure rod 21, and the lower end of the return spring 22 contacts the upper plane of the pressure head mounting seat 6.

[0059] like Figure 6 As shown, the convex spherical indenter 15 is a whole composed of a spherical body 25, a cube 24 and a strip body 23 from top to bottom, and the center lines of the spherical body, the cube and the strip body are the same straight line. Figure 5 , Figure 6 and Figure 7 As shown, where:

[0060] The side length of the cube 24 is 1.2 times the outer diameter of the concave spherical pressure rod 20;

[0061] The side length l of the strip 23 is equal to the width of the test piece 26;

[0062] The width b of the strip 23 is 5 times the thickness of the mud seam 27 of the test piece 26 .

[0063] like Figure 1 , Figure 5 and Figure 6 As shown, the right side surface of the strip body 23 of the convex spherical indenter 15 and the left end surface of the specimen seat plate slide rail 4 are in the same vertical plane.

[0064] A screw hole is vertically provided at the center of the spherical surface of the spherical body 25 , and the screw hole at the center of the spherical body 25 is threadedly connected to the lower end of the screw rod of the hexagon socket bolt 19 .

[0065] The center lines of the cylindrical pressure rod 21 , the concave spherical pressure rod 20 , the hexagon socket bolt 19 and the convex spherical pressure head 15 are the same straight line, and the concave spherical pressure rod 20 is movably installed in the pressure head mounting seat 6 of the pressure head device 2 .

[0066] The shape of the clamping base 11 is a strip block, the length × width of the lower plane of the strip block is equal to the length × width of the upper plane where the test piece 26 is placed, and the thickness of the strip block is 1.5 to 2 times the height of the cylindrical boss at the lower end of the clamping screw 13; a blind hole is provided in the middle position of the upper plane of the strip block, and the diameter of the blind hole is 1.2 times the diameter of the cylindrical boss at the lower end of the clamping screw 13.

[0067] The steps of using the test device are:

[0068] Step 1: Move the test device onto the press base so that the center line of the upper ram of the press is aligned with the center line of the cylindrical pressure rod 21 of the ram device 2, and adjust the upper ram of the press to descend to the upper plane of the cylindrical pressure rod 21 of the ram device 2.

[0069] Step 2: Measure Figure 7 The size of the mud gap 27 of the test piece 26 is shown; the test piece 26 is made by bonding two refractory test blocks with refractory mud according to GB / T22459.3-2008 standard, and then drying, baking or sintering.

[0070] Step 3 to Step 7 Figure 8 As shown:

[0071] Step 3: Adjust the specimen seat knob 10 to make the left end surface of the specimen seat 5 flush with the left end surface of the specimen seat slide rail.

[0072] Step 4: Place the test piece 26 on the test piece base plate 5 so that the front and left sides of the test piece 26 are flush with the corresponding surfaces of the test piece base plate 5; adjust the test piece clamping device 7 so that the test piece clamping device 7 lightly presses the refractory material test block on the right side of the test piece 26.

[0073] Step 5: Adjust the specimen adjustment knob 9 to make the right edge of the mud seam at the upper end of the left test block of the test piece 26 flush with the left side surface of the strip body 23 of the convex spherical pressure head 15.

[0074] Step 6: Adjust the specimen pressing device 7 so that the specimen pressing device 7 presses the test block on the right side of the specimen 26 to be tested.

[0075] Step seven, turn on the press until shear deformation occurs between the mud joint 27 of the test piece 26 and the test block of the test piece 26; the pressure that causes shear deformation between the two test pieces of the test piece 26 and the mud joint 27 is the shear force on the mud joint 27 of the test piece 26, and the shear strength of the mud joint of the refractory material specimen at room temperature can be obtained based on the shear force and the size of the mud joint 27.

[0076] Example 2

[0077] A test device for the shear strength of slurry bonding joints of refractory specimens at room temperature. Except for the following technical parameters, the rest is the same as Example 1:

[0078] The side length of the cube 24 is 1.15 times the outer diameter of the concave spherical pressure rod 20 ; the width b of the strip 23 is 4 times the thickness of the mud seam 27 of the test piece 26 .

[0079] A blind hole is provided at the middle position of the upper plane of the strip-shaped body 23 , and the diameter of the blind hole is 1.15 times the diameter of the cylindrical boss at the lower end of the pressing screw 13 .

[0080] Example 3

[0081] A test device for the shear strength of slurry bonding joints of refractory specimens at room temperature. Except for the following technical parameters, the rest is the same as Example 1:

[0082] The side length of the cube 24 is 1.1 times the outer diameter of the concave spherical pressure rod 20 ; the width b of the strip 23 is 3 times the thickness of the mud seam 27 of the test piece 26 .

[0083] A blind hole is provided at the middle position of the upper plane of the strip-shaped body 23 , and the diameter of the blind hole is 1.1 times the diameter of the cylindrical boss at the lower end of the pressing screw 13 .

[0084] Compared with the prior art, this specific implementation has the following positive effects:

[0085] This specific embodiment is composed of a base 1 and a convex spherical pressure head device 2, which is installed in the pressure head installation hole at the upper end of the base 1, and has a simple structure. After the test piece 26 is placed on the test piece seat plate 5, the right edge of the mud seam 27 of the test piece 26 is adjusted to be flush with the right side surface of the strip body of the convex spherical pressure head 15 by the test piece seat plate knob 10 and the test piece adjustment knob 9, and then the right block of the test piece 26 is pressed by the test piece pressing device 7, which is convenient for debugging.

[0086] The test object of this specific embodiment is the test piece 26. Since the mud seam 27 has a certain thickness, the test pressure does not act directly on the mud seam 27 of the test piece 26, but acts on the two test pieces on both sides of the mud seam 27. The force component generated by the spacing caused by the thickness of the mud seam 27 will cause the upper end of the test piece 26 to tilt to the left. For this reason, this specific embodiment uses a test piece clamping device 7 to press tightly on the upper end surface of the right test block of the test piece 26 to prevent the right test block from tilting to the left due to force. The cylindrical boss at the lower end of the clamping screw 13 of the test piece clamping device 7 is a spherical structure, and the clamping base 11 is pressed tightly on the right test block of the test piece 26. When pressurized, the shape deviation caused by the longitudinal and lateral directions when making the test piece 26 can be automatically adjusted. The spherical movable pressure head can automatically fit the surface of the test block, and can adaptively fit tightly to press the test block of the test piece 26 to ensure the accuracy of the test results.

[0087] In this specific embodiment, the convex spherical pressure head 15 of the pressure head device 2 is hung on the lower surface of the concave spherical pressure rod 20, and the convex spherical pressure head 15 is flexibly moved within 360° by adjusting the hexagon socket bolt 19, and the rotation range within the direction of 360° is within 5°. The strip body 23 of the convex spherical pressure head 15 overcomes the slight shape deviation caused by the bonding process of the mud seam 27 of the test piece 26 and can adaptively and closely fit the left test block of the test piece 26, thereby reducing the test error.

[0088] Therefore, the structure of this specific embodiment is simple, and the shear strength test device for the mud bonding joint of the refractory specimen at room temperature provided has the characteristics of convenient debugging and accurate test results.

Claims

1. A test device for the shear strength of slurry bonding joints of refractory specimens at room temperature, characterized in that: The testing device is composed of a base (1) and a pressure head device (2), wherein the pressure head device (2) is installed at the left end of the upper part of the base (1); The base (1) comprises a base bottom plate (3), a specimen seat plate slide rail (4), a specimen seat plate (5), a pressure head mounting seat (6), a specimen pressing device (7) and a base column (8); the base bottom plate (3) is a rectangular flat plate, and a base column (8) is vertically fixed at the middle position of the right end surface of the base bottom plate (3); the specimen seat plate slide rail (4) is fixedly mounted on the upper plane of the base bottom plate (3), the right end surface of the specimen seat plate slide rail (4) is close to the left side surface of the base column (8), the specimen seat plate slide rail (4) is located at the middle position of the base bottom plate (3), and the specimen seat plate (5) is movably mounted on the specimen seat plate slide rail (4); The base column (8) is an inverted "L"-shaped whole composed of a horizontal rod and a vertical rod. A pressure head mounting seat (6) is fixed to the left end surface of the horizontal rod of the base column (8). The pressure head mounting seat (6) is in a square shape. A through hole is provided at the middle position of the pressure head mounting seat (6). The center line of the through hole is parallel to the center line of the vertical rod of the inverted "L" rod. The horizontal rod of the base column (8) is provided with a test piece clamping device (7). The test piece clamping device (7) is located between the vertical rod of the base column (8) and the pressure head mounting seat (6). A specimen seat plate knob (10) is provided at the lower part of the base column (8), and the specimen seat plate knob (10) is threadedly connected to the right end surface of the specimen seat plate (5); a specimen adjustment knob (9) is provided at the middle part of the base column (8); The specimen clamping device (7) is composed of a clamping base (11), a clamping base cover plate (12), a clamping screw (13) and a nut (14); the main body of the clamping screw (13) is a stud, the lower end of the stud and the cylindrical boss form a whole, and the lower surface of the cylindrical boss is a spherical surface; The stud of the clamping screw (13) passes through the clamping base cover (12) and is threadedly connected to the screw hole of the horizontal rod of the specimen clamping device (7); the upper end of the clamping screw (13) is fixedly connected to the nut (14); the cylindrical boss at the lower end of the clamping screw (13) is movably inserted into the blind hole of the clamping base (11); the clamping base cover (12) is fixedly connected to the clamping base (11) by screws; The pressure head device (2) is composed of a cylindrical pressure rod (21), a concave spherical pressure rod (20), a hexagon socket bolt (19), an upper end cover of an adjusting spring (18), an adjusting spring (17), a lower end cover of an adjusting spring (16), a convex spherical pressure head (15) and a return spring (22); The cylindrical pressure rod (21) is composed of a circular boss, a cylinder and an external thread section, which are coaxially integrated. The circular boss is located at the upper end of the cylinder, and the external thread section is located at the lower end of the cylinder. The concave spherical pressure rod (20) is a hollow cylinder, the upper part of the hollow cylinder is a cylindrical cavity, and the lower end surface of the hollow cylinder is a concave spherical surface, which is connected to the cylindrical cavity through a conical through hole. The hexagon socket bolt (19) is installed in the cylindrical cavity, and the screw of the hexagon socket bolt (19) passes through the upper end cover (18) of the adjusting spring, the adjusting spring (17), and the lower end cover (16) of the adjusting spring in sequence, and is threadedly connected to the screw hole of the convex spherical pressure head (15) through the conical through hole. An inner thread is provided on the inner wall of the upper part of the concave spherical pressure rod (20), and the inner thread is threadedly connected with the outer thread section of the cylindrical pressure rod (21). The outer diameter of the concave spherical pressure rod (20) is the same as the outer diameter of the cylindrical pressure rod (21). A return spring (22) is sleeved on the cylindrical surfaces of the concave spherical pressure rod (20) and the cylindrical pressure rod (21). The upper end of the return spring (22) contacts the circular boss of the cylindrical pressure rod (21), and the lower end of the return spring (22) contacts the upper plane of the pressure head mounting seat (6). The convex spherical pressure head (15) is a whole composed of a spherical body (25), a cube (24) and a strip body (23) in order from top to bottom, and the center lines of the spherical body, the cube and the strip body are the same straight line; wherein: The side length of the cube (24) is 1.1 to 1.2 times the outer diameter of the concave spherical pressure rod (20). The side length l of the strip (23) is equal to the width of the test piece (26). The width b of the strip (23) is 3 to 5 times the thickness of the mud seam (27) of the test piece (26); The right side surface of the strip body (23) of the convex spherical pressure head (15) and the left end surface of the specimen seat plate slide rail (4) are in the same vertical plane; A screw hole is vertically provided at the center of the spherical surface of the spherical body (25), and the screw hole at the center of the spherical body (25) is threadedly connected to the lower end of the screw rod of the hexagon socket bolt (19); The center lines of the cylindrical pressure rod (21), the concave spherical pressure rod (20), the hexagon socket bolt (19) and the convex spherical pressure head (15) are the same straight line, and the concave spherical pressure rod (20) is movably installed in the pressure head mounting seat (6) of the pressure head device (2).

2. The test device for the shear strength of the slurry bonding joint of a refractory specimen at room temperature according to claim 1 is characterized in that The shape of the clamping base (11) is a strip block, the length × width of the lower plane of the strip block is equal to the length × width of the upper plane where the test piece (26) is placed, and the thickness of the strip block is 1.5 to 2 times the height of the cylindrical boss at the lower end of the clamping screw (13); a blind hole is provided in the middle position of the upper plane of the strip block, and the diameter of the blind hole is 1.1 to 1.2 times the diameter of the cylindrical boss at the lower end of the clamping screw (13).

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