Clamping tool for masonry of refractory bricks and use method of clamping tool

Abstract

The invention discloses a clamping tool for masonry of refractory bricks and a using method of the clamping tool, and belongs to the field of refractory brick fixtures. Through cooperation of structures such as a first inclined block, a rotating assembly and a gasket, refractory bricks with different lengths within a certain length range can be conveniently clamped, so that the production efficiency is improved; when a limiting rod moves downwards, a protrusion on the outer wall of the limiting rod slides along the track of a guide groove, so that a cylindrical cam and a gear outside the cylindrical cam are driven to rotate clockwise, then the gear is meshed with a first tooth plate and a second tooth plate, the first tooth plate and the second tooth plate are driven to move in the opposite directions, and then the two clamping plates are driven to move in the opposite directions; and when the gaskets abut against the outer walls of the refractory bricks, the handle is lifted upwards while the push rod is pressed, and therefore the effect of clamping the refractory bricks with different lengths is achieved. Through cooperation of the clamping plate, the pointer and other structures, the length of the clamped refractory brick can be measured conveniently, and therefore the construction efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the field of refractory brick clamps, and specifically relates to a clamping tool for laying refractory bricks and a use method thereof. Background Art

[0002] Refractory bricks are a kind of high-temperature fire-resistant material with the characteristics of high temperature resistance, wear resistance, and chemical corrosion resistance. They are usually used in the internal refractory structure or lining of high-temperature industrial equipment, industrial furnaces, heat treatment furnaces, sintering furnaces, steel furnaces and other equipment. The purpose of laying refractory bricks is to protect the equipment from deformation and cracking at high temperatures. At the same time, they can also play the role of heat insulation, furnace gas isolation, and fire prevention.

[0003] The utility model patent with publication number CN210794530U discloses a brick clamp, including a handle, a right brick clamp, a force rod and a left brick clamp. A rubber sleeve is provided on the handle, and a non-slip rubber layer is attached to the surface of the left brick clamp and the right brick clamp on the opposite side. A hand guard is provided under the force rod, and the two ends of the hand guard are respectively connected to the left brick clamp and the right brick clamp. The brick clamp is convenient for clamping bricks and is not easy to slip and can avoid damaging the surface of the bricks. The brick clamp can also prevent the clamped bricks from rubbing the operator's hands.

[0004] When the above device is in use, the hand guard and the left and right brick clamps are designed to protect the operator's hands while clamping bricks. However, during the construction process, different processes have different requirements for the number of bricks to be clamped, and the size of the bricks will also affect the number of bricks to be clamped. When the above device is in use, the clamping length of the brick clamp cannot be adjusted according to the number of bricks, and the construction efficiency needs to be improved. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a clamping tool for laying refractory bricks and a method of using the same to solve the problems mentioned in the background technology or to achieve better technical effects.

[0006] In order to solve the above technical problems, the inventors have obtained the technical solution of the present invention through practice and summary. The present invention discloses that the present invention provides a clamping tool for laying refractory bricks, including an outer box, a handle is fixedly connected to the top of the outer box, a push rod is movably connected to the handle, a first inclined block is fixedly connected to the top of the push rod, the handle is movably connected to the second inclined blocks located at the left and right ends of the first inclined block, the opposite ends of the two second inclined blocks are hinged to the first connecting rod, and the bottom end of the first connecting rod is hinged to the second connecting rod; the outer box is movably connected to a movable plate, the bottom of the movable plate is fixedly connected to a limiting rod, and a rotating assembly is arranged inside the outer box;

[0007] Wherein, the rotating assembly comprises a cylindrical cam movably connected to the inside of the outer box, and the inner wall of the cylindrical cam is provided with an annular guide groove;

[0008] The outer wall of the cylindrical cam is fixedly connected with a gear, the interior of the outer box is movably connected with a first tooth plate and a second tooth plate, the bottoms of the first tooth plate and the second tooth plate are both provided with clamping assemblies, and the front and rear sides of the outer wall of the outer box are both provided with scales.

[0009] Preferably, the clamping assembly comprises a clamping plate, and gaskets are fixedly connected to opposite sides of two clamping plates, and the gaskets are made of rubber material. Pointers are fixedly connected to the front and rear ends of the top of the clamping plate.

[0010] Preferably, a round rod is fixedly connected to the top of the clamping plate, a straight slot for limiting the round rod is provided at the bottom of the outer box, and a protrusion is provided at the bottom of the outer box.

[0011] Preferably, the clamping plate passes through the outer wall of the outer box and extends to the outside of the outer box, and opposite sides of the two pointers are in contact with the outer wall of the outer box.

[0012] Preferably, the push rod is T-shaped, and both ends of the first inclined block are inclined; the opposite ends of the two second inclined blocks are inclined, and the opposite ends of the two second inclined blocks are respectively abutted against the two ends of the first inclined block, and when the first inclined block moves upward, it squeezes the two second inclined blocks to move in opposite directions.

[0013] Preferably, the bottom ends of the two second connecting rods are fixedly connected to the moving plate.

[0014] Preferably, the outer wall of the limiting rod is provided with a protrusion, and the protrusion cooperates with the guide groove. When the limiting rod moves downward, the protrusion slides along the track of the guide groove and drives the cylindrical cam to rotate clockwise.

[0015] Preferably, the outer movable sleeve of the limiting rod is provided with a spring, and the two ends of the spring are respectively fixedly connected to the moving plate and the cylindrical cam, and the spring is used for pressing the moving plate and keeping the moving plate in a tendency to move upward.

[0016] Preferably, opposite sides of the first tooth plate and the second tooth plate are both meshed with gears, and when the gear rotates counterclockwise, it drives the first tooth plate and the second tooth plate to move toward each other.

[0017] The present invention also discloses a method for using a clamping tool for laying refractory bricks, comprising:

[0018] Clamping and carrying: The operator places the entire device above the refractory bricks to be clamped, and then the outer box abuts against the top of the refractory bricks. At this time, the operator presses the push rod toward the inside of the handle, and the first tooth plate and the second tooth plate move toward each other, thereby causing the two clamping components to move toward each other. When the gasket abuts against the outer wall of the refractory brick, the operator continues to press the push rod, so that the gasket generates friction resistance to the outer wall of the refractory brick. Then the operator presses the push rod and lifts the handle upwards to clamp and carry the refractory bricks.

[0019] Length measurement: When the clamping plate moves, it drives the pointer on its top to move in the same direction. When the two gaskets are in contact with the outer wall of the refractory brick, the pointer moves to the corresponding scale value on the scale. Then, the operator can calculate the value to obtain the length of the clamped refractory brick.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention facilitates the clamping of refractory bricks of different lengths within a certain length range through the coordination of structures such as the first inclined block, the rotating assembly and the gasket, thereby improving production efficiency; when the limit rod moves downward, the protrusion on its outer wall slides along the trajectory of the guide groove, thereby driving the cylindrical cam and the gear outside it to rotate clockwise, and then the first tooth plate and the second tooth plate are engaged with the gear, thereby driving the first tooth plate and the second tooth plate to move toward each other, and then driving the two clamping plates to move toward each other, when the gasket abuts against the outer wall of the refractory brick, the push rod is pressed and the handle is lifted upward at the same time, thereby achieving the effect of clamping refractory bricks of different lengths.

[0022] The present invention facilitates the measurement of the length of the clamped refractory bricks through the coordination of structures such as the clamping plate and the pointer, thereby improving the construction efficiency. The pointer is driven to move in the same direction while the clamping plate moves. When the gasket abuts against the outer wall of the refractory brick, the two pointers move toward each other to a predetermined position. Then, the difference between the scale values ​​of the two pointers on the scale is calculated to obtain the length of the clamped refractory bricks, thereby improving the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 for Figure 1Enlarged view of point A in the middle;

[0026] Figure 3 It is a schematic diagram of the positional relationship of the gear, the first tooth plate, the second tooth plate and the clamping assembly of the present invention;

[0027] Figure 4 It is a schematic diagram of the front cross-section structure of the present invention;

[0028] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0029] Figure 6 for Figure 4 Enlarged view of point C in the middle;

[0030] Figure 7 It is a partial cross-sectional view of the rotating assembly of the present invention.

[0031] In the figure: 1. outer box; 2. handle; 3. push rod; 4. first inclined block; 5. second inclined block; 6. first connecting rod; 7. second connecting rod; 8. moving plate; 9. limit rod; 10. rotating assembly; 1001. cylindrical cam; 1002. guide groove; 1003. spring; 11. gear; 12. first tooth plate; 13. second tooth plate; 14. clamping assembly; 1401. clamping plate; 1402. gasket; 1403. pointer; 15. ruler. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] The application principle of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] Example 1

[0035] like Figure 1 to Figure 1 As shown, the present invention provides a clamping tool for laying refractory bricks, comprising an outer box 1, a handle 2 is fixedly connected to the top of the outer box 1, a push rod 3 is movably connected to the bottom of the handle 2, a first inclined block 4 is fixedly connected to the top of the push rod 3, a second inclined block 5 located at the left and right ends of the first inclined block 4 is movably connected to the inside of the handle 2, a first connecting rod 6 is hinged to the opposite ends of the two second inclined blocks 5, a second connecting rod 7 is hinged to the bottom end of the first connecting rod 6, a moving plate 8 is movably connected to the inside of the outer box 1, a limiting rod 9 is fixedly connected to the bottom of the moving plate 8, and a rotating assembly 10 is arranged inside the outer box 1;

[0036] The rotating assembly 10 comprises a cylindrical cam 1001 movably connected to the inside of the outer box 1, and the inner wall of the cylindrical cam 1001 is provided with a surrounding guide groove 1002;

[0037] The outer wall of the cylindrical cam 1001 is fixedly connected with a gear 11, and the interior of the outer box 1 is movably connected with a first tooth plate 12 and a second tooth plate 13. The bottoms of the first tooth plate 12 and the second tooth plate 13 are both provided with a clamping assembly 14, and the front and rear sides of the outer wall of the outer box 1 are both provided with a scale 15.

[0038] The above scheme is adopted: by pressing the push rod 3, the first inclined block 4 is driven to squeeze the two second inclined blocks 5 to move toward each other; then the second inclined block 5 pushes the first connecting rod 6 to rotate around the axis, and the second connecting rod 7 moves downward to drive the movable plate 8 and the limit rod 9 to move downward. When the limit rod 9 moves downward, the protrusion on its outer wall slides along the trajectory of the guide groove 1002, thereby driving the cylindrical cam 1001 and the gear 11 outside it to rotate clockwise, and then through the engagement of the gear 11 with the first tooth plate 12 and the second tooth plate 13, the first tooth plate 12 and the second tooth plate 13 are driven to move toward each other, thereby driving the two clamping plates 1401 to move toward each other, and when the gasket 1402 abuts against the outer wall of the refractory brick, the push rod 3 is pressed at this time and the handle 2 is lifted upward, thereby achieving the effect of clamping refractory bricks of different lengths within a certain length range.

[0039] Necessary: ​​the contact surface between the first inclined block 4 and the two second inclined blocks 5 has a sufficient width, and the handle 2 also has a cavity of sufficient height and width. To ensure the accuracy of the first inclined block 4 and the two second inclined blocks 5 moving toward each other, the contact surfaces between the first inclined block 4 and the two second inclined blocks 5 can guide each other, for example: the first inclined block 4 includes a linear protrusion at the contact surface, and the two second inclined blocks 5 correspondingly include a linear groove that cooperates with the linear protrusion;

[0040] The first inclined block 4 moves in the vertical direction, and the two second inclined blocks 5 move in the horizontal direction;

[0041] The first connecting rod 6 is connected to an axis, and the first connecting rod 6 can rotate around the axis;

[0042] It should be emphasized that: in order to ensure that the second inclined block 5 pushes the first connecting rod 6 to rotate around the axis, and the second connecting rod 7 moves downward to drive the movable plate 8 to move downward, the hinge mode of the second inclined block 5 and the first connecting rod 6 needs to ensure that the second inclined block 5 does not move up and down while the first connecting rod 6 rotates, for example: the hinge mode is that there is a slide groove on the first connecting rod 6, and the hinged parts of the second inclined block 5 and the first connecting rod 6 can slide in the slide groove; correspondingly, the hinge mode of the first connecting rod 6 and the second connecting rod 7 needs to ensure that the second connecting rod 7 does not move horizontally while the first connecting rod 6 rotates, for example: the hinge mode is that there is a second slide groove on the first connecting rod 6, and the second hinged parts of the first connecting rod 6 and the second connecting rod 7 can slide in the second slide groove;

[0043] The protrusion on the outer wall of the limiting rod 9 needs to match the trajectory of the guide groove 1002 to ensure that the protrusion can slide smoothly in the guide groove 1002.

[0044] like Figures 1 to 4 As shown, the clamping assembly 14 includes a clamping plate 1401 , and gaskets 1402 are fixedly connected to opposite sides of the two clamping plates 1401 . The gaskets 1402 are made of rubber material, and pointers 1403 are fixedly connected to the front and rear ends of the top of the clamping plates 1401 .

[0045] The above scheme is adopted: the gasket 1402 is made of rubber material, and its function is that since the rubber material has elasticity, it can play a certain buffering role. When the device clamps the refractory bricks, the gasket 1402 can buffer the squeezing force of the device on the refractory bricks, thereby preventing the refractory bricks from being damaged. At the same time, the surface of the rubber material has a certain friction force, so it can increase the clamping force of the clamping plate 1401 on the refractory bricks, thereby preventing the refractory bricks from sliding or falling off during the clamping process.

[0046] like Figures 1 to 5 As shown, a round rod is fixedly connected to the top of the clamping plate 1401, a straight groove for limiting the round rod is opened at the bottom of the outer box 1, a protrusion is arranged at the bottom of the outer box 1, the clamping plate 1401 passes through the outer wall of the outer box 1 and extends to the outside of the outer box 1, the opposite sides of the two pointers 1403 are both in contact with the outer wall of the outer box 1, the bottom end of the push rod 3 passes through the outer wall of the handle 2 and extends to the outside of the handle 2, the push rod 3 is T-shaped, the two ends of the first inclined block 4 are both inclined, the opposite ends of the two second inclined blocks 5 are both inclined, the opposite ends of the two second inclined blocks 5 are respectively in contact with the two ends of the first inclined block 4, and when the first inclined block 4 moves upward, it squeezes the two second inclined blocks 5 to move in opposite directions, the second connecting rod 7 extends to the inside of the outer box 1, and the bottom ends of the two second connecting rods 7 are fixedly connected to the movable plate 8.

[0047] The above scheme is adopted: through the design of the pointer 1403, its function is that the clamping plate 1401 moves and the pointer 1403 is driven to move in the same direction. When the gasket 1402 abuts against the outer wall of the refractory brick, the two pointers 1403 move toward each other to the predetermined position. Then, the length of the clamped refractory brick can be obtained through the scale of the two pointers 1403 on the ruler 15, thereby improving the construction efficiency.

[0048] like Figure 3 to Figure 4 , Figure 6 to Figure 7As shown, the protrusion on the outer wall of the limit rod 9 is movably engaged with the inside of the guide groove 1002. When the limit rod 9 moves downward, the protrusion slides along the trajectory of the guide groove 1002 and drives the cylindrical cam 1001 to rotate clockwise; the outer movably sleeve of the limit rod 9 is provided with a spring 1003, and the two ends of the spring 1003 are respectively fixedly connected to the movable plate 8 and the cylindrical cam 1001. The spring 1003 is used to squeeze the movable plate 8 and keep the movable plate 8 moving upward. The opposite sides of the first tooth plate 12 and the second tooth plate 13 are both engaged with the gear 11. When the gear 11 rotates counterclockwise, it drives the first tooth plate 12 and the second tooth plate 13 to move toward each other.

[0049] The above scheme is adopted: the movable plate 8 is supported by the spring 1003, and its function is that when the refractory bricks are transported to the predetermined position, the operator releases the pressure on the push rod 3, so that the first inclined block 4 releases the squeezing of the two second inclined blocks 5. At this time, the movable plate 8 drives the limit rod 9 to move upward under the action of the elastic force of the spring 1003. While the limit rod 9 moves upward, it drives the cylindrical cam 1001 and the gear 11 outside it to rotate in the opposite direction through the guide groove 1002, thereby driving the first tooth plate 12 and the second tooth plate 13 to move in opposite directions, and then the two clamping plates 1401 move in opposite directions and release the clamping of the refractory bricks. While the movable plate 8 moves upward, it drives the second connecting rod 7 to move upward, and then the second connecting rod 7 drives the second inclined blocks 5 to move toward each other through the first connecting rod 6, so that the push rod 3 and the first inclined block 4 are reset under the action of external force, which is convenient for the operator to use next time.

[0050] It is worth noting here that the middle scale of the scale 15 is zero degree, and with the middle zero degree as the center, numbers are marked in increasing and decreasing order to the left and right sides respectively, and then the two pointers 1403 move toward each other, and by calculating the value, the length of the clamped refractory brick can be obtained.

[0051] The working principle and use process of the present invention are as follows: the operator places the device as a whole above the refractory bricks to be clamped, and then the outer box 1 abuts against the top of the refractory bricks, and the operator presses the push rod 3 toward the inside of the handle 2, thereby driving the first inclined block 4 to move upward, and while the first inclined block 4 moves upward, it squeezes the two second inclined blocks 5 to move in the opposite direction, and then the second inclined block 5 drives the second connecting rod 7 to move downward through the first connecting rod 6, and then drives the limit rod 9 to move downward through the moving plate 8, and while the limit rod 9 moves downward, the protrusions on both sides thereof slide along the trajectory of the guide groove 1002, thereby driving the cylindrical cam 1001 to rotate;

[0052] When the cylindrical cam 1001 rotates, it drives the gear 11 outside it to rotate clockwise, and then the gear 11 meshes with the first tooth plate 12 and the second tooth plate 13, thereby driving the first tooth plate 12 and the second tooth plate 13 to move toward each other, thereby causing the two clamping assemblies 14 to move toward each other, and when the gasket 1402 abuts against the outer wall of the refractory brick, the operator continues to press the push rod 3, so that the gasket 1402 generates friction resistance to the outer wall of the refractory brick, and then the operator presses the push rod 3 and lifts the handle 2 upwards, thereby clamping and carrying the refractory brick;

[0053] As the clamping plate 1401 moves, it drives the pointer 1403 on its top to move in the same direction. When the two gaskets 1402 are in contact with the outer wall of the refractory brick, the pointer 1403 moves to the corresponding scale value on the scale 15. Then, the operator can calculate the value between the two pointers 1403 to obtain the length of the clamped refractory brick.

[0054] The gear 11 on its outside rotates in the opposite direction, thereby driving the first tooth plate 12 and the second tooth plate 13 to move in opposite directions, and then the two clamping plates 1401 move in opposite directions and release the clamping of the refractory bricks. The moving plate 8 moves up and drives the second connecting rod 7 to move upward. Then the second connecting rod 7 drives the second inclined block 5 to move toward each other through the first connecting rod 6, thereby resetting the push rod 3 and the first inclined block 4 under the action of external force, which is convenient for the operator to use next time.

[0055] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0056] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0057] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A clamping tool for laying refractory bricks, characterized in that: The invention comprises an outer box, wherein a handle is fixedly connected to the top of the outer box, a push rod is movably connected to the handle, a first inclined block is fixedly connected to the top of the push rod, a second inclined block located at the left and right ends of the first inclined block is movably connected to the inside of the handle, a first connecting rod is hinged to the opposite ends of the two second inclined blocks, and a second connecting rod is hinged to the bottom end of the first connecting rod; a movable plate is movably connected to the inside of the outer box, a limiting rod is fixedly connected to the bottom of the movable plate, and a rotating assembly is arranged inside the outer box; The rotating assembly includes a cylindrical cam movably connected to the inside of an outer box, and the inner wall of the cylindrical cam is provided with an annular guide groove; the outer wall of the cylindrical cam is fixedly connected with a gear, and the inside of the outer box is movably connected with a first tooth plate and a second tooth plate, and the bottoms of the first tooth plate and the second tooth plate are both provided with clamping assemblies.

2. A clamping tool for laying refractory bricks according to claim 1, characterized in that: The clamping assembly includes a clamping plate, and gaskets are fixedly connected to the opposite sides of the two clamping plates, and the gaskets are made of rubber material. Pointers are fixedly connected to the front and rear ends of the top of the clamping plate, and the opposite sides of the two pointers are in contact with the outer wall of the outer box; scales are provided on the front and rear sides of the outer wall of the outer box.

3. A clamping tool for laying refractory bricks according to claim 2, characterized in that: The top of the clamping plate is fixedly connected with a round rod, and the bottom of the outer box is provided with a straight slot for limiting the round rod; the clamping plate penetrates the outer wall of the outer box and extends to the outside of the outer box.

4. The clamping tool for laying refractory bricks according to claim 1, characterized in that: The push rod is T-shaped, and both ends of the first inclined block are inclined; the opposite ends of the two second inclined blocks are inclined, and the opposite ends of the two second inclined blocks are respectively abutted against the two ends of the first inclined block. When the first inclined block moves upward, it squeezes the two second inclined blocks to move in opposite directions.

5. A clamping tool for laying refractory bricks according to claim 4, characterized in that: The bottom ends of the two second connecting rods are fixedly connected to the moving plate.

6. A clamping tool for laying refractory bricks according to claim 4, characterized in that: The outer wall of the limiting rod is provided with a protrusion, and the protrusion cooperates with the guide groove.

7. The clamping tool for laying refractory bricks according to claim 4, characterized in that: The outer part of the limiting rod is movably sleeved with a spring, and the two ends of the spring are respectively fixedly connected to the moving plate and the cylindrical cam.

8. The clamping tool for laying refractory bricks according to claim 4, characterized in that: The first tooth plate and the second tooth plate are meshed with the gear on one side opposite to the first tooth plate. When the gear rotates counterclockwise, the first tooth plate and the second tooth plate are driven to move toward each other.

9. A method for using a clamping tool for laying refractory bricks, comprising the clamping tool for laying refractory bricks according to any one of claims 1 to 8, characterized in that: Clamping and carrying: The operator places the entire device above the refractory bricks to be clamped, and then the outer box abuts against the top of the refractory bricks. At this time, the operator presses the push rod toward the inside of the handle, and the first tooth plate and the second tooth plate move toward each other, thereby causing the two clamping components to move toward each other. When the gasket abuts against the outer wall of the refractory brick, the operator continues to press the push rod, so that the gasket generates friction resistance to the outer wall of the refractory brick. Then the operator presses the push rod and lifts the handle upwards to clamp and carry the refractory bricks. Length measurement: When the clamping plate moves, it drives the pointer on its top to move in the same direction. When the two gaskets are in contact with the outer wall of the refractory brick, the pointer moves to the corresponding scale value on the scale. Then, the operator can calculate the value to obtain the length of the clamped refractory brick.

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