Cutting device for cutting rock test piece

By designing a cutting device that includes a threaded rod and a gear rack, the problem of insufficient cutting accuracy of cuboid rock specimens was solved, and high-precision cutting of rectangular cuts was achieved, which is suitable for scientific research experiments and engineering applications.

CN224060157UActive Publication Date: 2026-03-31ANHUI UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-04-03
Publication Date
2026-03-31

AI Technical Summary

Technical Problem

Existing technologies for cutting rectangular rock specimens suffer from insufficient cutting precision due to human error, making it difficult to guarantee the flatness and perpendicularity of the rectangular cut, which affects subsequent experimental research and engineering applications.

Method used

Design a cutting device that includes a base, a threaded rod, a movable seat, a support platform, a clamping plate, and a cutting mechanism. Through the cooperation of the threaded rod and the gear rack, the rock specimen can be cut multiple times to form a rectangular cut.

Benefits of technology

It improves cutting precision, ensures the flatness and perpendicularity of rectangular cuts, enhances the stability and consistency of the cutting process, and meets the needs of experimental research and engineering applications.

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Abstract

The utility model belongs to the field of rock test piece cutting, and discloses a cutting device for cutting a rock test piece, which comprises a base, a first threaded rod rotationally arranged on the base, a movable seat in threaded connection with the first threaded rod, a second threaded rod rotationally arranged on the movable seat, a bearing table in threaded connection with the second threaded rod, and a fixed plate fixed on the bearing table, a clamping plate is fixed at the inner side end of the threaded column; a connecting rod is fixed to the lower end of the rack, an adjusting plate is fixed to the other end of the connecting rod, two sliding rods are arranged on the adjusting plate in a sliding mode, the sliding rods are fixed into a fixing frame, the fixing frame is fixed to the lower end of the base, the sliding rods are sleeved with springs, and a cylinder is fixed to the inner side of the connecting rod. An adjusting block fixed to the movable base is arranged at the cylinder, and inclined faces are arranged at the two ends of the adjusting block. The cutting precision can be improved, a rectangular notch is cut in the cuboid rock test piece, and subsequent experimental research is facilitated.
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Description

Technical Field

[0001] This utility model belongs to the field of rock specimen cutting, and specifically relates to a cutting device for cutting rock specimens. Background Technology

[0002] In scientific research experiments and engineering practices, the cutting of rectangular rock specimens is often involved. Typically, a rectangular slit is cut into the specimen. Previously, this was simply done by placing the specimen directly onto a standard cutting machine. However, in practice, it's evident that the heavy reliance on manual operation introduces numerous human errors. For instance, it's difficult to ensure the specimen is perfectly level when placed on the cutting machine table. Even a tiny tilt can accumulate errors during cutting, resulting in non-perfectly flat and perpendicular surfaces within the rectangular slit, and dimensional accuracy falls short of expectations. Furthermore, consistent control over cutting speed and pressure during manual operation further impacts precision. These inaccuracies pose significant challenges to subsequent experimental research and engineering applications. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a cutting device for cutting rock specimens, which can improve the cutting accuracy and cut a rectangular slit in a cuboid rock specimen, which is beneficial to subsequent experimental research or engineering applications.

[0004] The objective of this utility model can be achieved through the following technical solutions:

[0005] A cutting device for cutting rock specimens, comprising:

[0006] The base has a first threaded rod rotatably connected to its upper end, a movable seat threadedly connected to the first threaded rod, a second threaded rod rotatably connected to the upper end of the movable seat, a bearing platform threadedly connected to the second threaded rod, fixed plates fixedly connected to both ends of the bearing platform, threaded columns threadedly connected to the two fixed plates on the same side of the bearing platform, and clamping plates fixedly connected to the inner ends of the threaded columns.

[0007] A gear is fixedly connected to one end of the second threaded rod, a rack is provided below the gear, a connecting rod is fixedly connected to the lower end of the rack, an adjusting plate is fixedly connected to the other end of the connecting rod, two sliding rods are slidably connected to the adjusting plate, the sliding rods are fixedly connected inside the fixing frame, the fixing frame is fixedly connected to the lower end of the base, springs are sleeved on the sliding rods on both sides of the adjusting plate, a cylinder is fixedly connected to the inner side of the connecting rod, an adjusting block is provided at the cylinder, the adjusting block is fixedly connected to the moving seat, and inclined surfaces are provided at both ends of the adjusting block;

[0008] A wall column is fixedly connected to one end of a base. A sliding groove is provided on the wall column, and a third threaded rod is rotatably connected in the sliding groove. A first slider that slides in the sliding groove is threadedly connected to the third threaded rod. A suspension plate is fixedly connected to the first slider, and a cutting mechanism is installed on the suspension plate.

[0009] The principles and technical effects of the above technical solution are as follows:

[0010] The rock specimen is placed on the support platform. The rock specimen is clamped by the clamping plate by rotating the threaded column, thus fixing it in place. The height of the suspension plate is adjusted by rotating the third threaded rod, which in turn adjusts the height of the cutting mechanism. Rotating the first threaded rod moves the moving seat, which in turn moves the support platform, which in turn moves the rock specimen. When the rock specimen passes the cutting mechanism, the cutting blade on the cutting mechanism cuts the rock specimen once. Continuing to rotate the first threaded rod, when the cylinder contacts the inclined surface at the end of the adjusting block, the cylinder moves along the inclined surface to the upper end face of the adjusting block. During this process, the connecting rod moves upward, lifting the rack, causing the gear to mesh with the rack. Simultaneously, the connecting rod pulls the adjusting plate upward, compressing the spring at the top of the adjusting plate until the cylinder leaves the upper end face of the adjusting block. At this point, the gear and rack... The meshing of the gears causes them to rotate, which in turn drives the second threaded rod to rotate. The second threaded rod then moves the support platform, which in turn moves the rock specimen. This causes the cut on the rock specimen to deviate from the cutting trajectory. The first threaded rod is then rotated in the opposite direction. When the cylinder contacts the inclined surface at the other end of the adjusting block, the cylinder moves along the inclined surface to the lower end of the adjusting block. During this process, the connecting rod moves downward, causing the rack and gear to separate. At the same time, the connecting rod moves the adjusting plate downward, compressing the spring at the lower end of the adjusting plate until the cylinder leaves the lower end of the adjusting block. The first threaded rod continues to rotate, moving the rock specimen and causing it to be cut again by the cutting blade on the cutting mechanism. This process is repeated to achieve multiple cuts at different positions on the rock specimen. After multiple cuts, a rectangular cut is formed on the rock specimen.

[0011] In a preferred embodiment, the present invention can be further configured such that: the cutting mechanism includes a support arm fixedly connected to the suspension plate, a first motor fixedly connected to the support arm, and a cutting blade fixedly connected to the output end of the first motor.

[0012] In a preferred embodiment, the present invention can be further configured such that a second motor is fixedly connected to the top of the wall column, and the output end of the second motor is fixedly connected to a third threaded rod.

[0013] In a preferred embodiment, the present invention can be further configured such that: slide rails parallel to the first threaded rod are provided on both sides of the first threaded rod, the slide rails are fixedly connected to the base, and a second slider is slidably connected to the slide rails, the second slider being fixedly connected to the lower end of the movable seat.

[0014] In a preferred embodiment, the present invention can be further configured such that: guide rods parallel to the second threaded rod are provided on both sides of the second threaded rod, the guide rods are slidably connected to the support platform, and the two ends of the guide rods are fixedly connected to the ends of the movable seat.

[0015] In a preferred embodiment, the present invention can be further configured such that a third motor is fixedly connected to one end of the first threaded rod.

[0016] In a preferred embodiment, the present invention can be further configured such that a second rotating member is fixedly connected to the other end of the second threaded rod.

[0017] In a preferred embodiment, the present invention can be further configured such that a third rotating member is fixedly connected to the outer end of the threaded column.

[0018] The explanations of the nouns, conjunctions, or adjectives used in the above technical solutions are as follows:

[0019] A fixed connection refers to a connection in which parts or components are fixed in place, with no relative movement between them. These connections are divided into two types: detachable and non-detachable.

[0020] (1) Detachable connections use screws, splines, wedges, etc. to fix parts together. This type of connection can be disassembled during maintenance without damaging the parts. However, the specifications of the connecting parts used must be correct (such as the length of bolts, keys, wedges) and properly tightened.

[0021] (2) Non-removable connections mainly refer to welding, riveting, and tenon joints. Since disassembly is required by forging, sawing, or oxy-acetylene cutting during repair or replacement, the parts generally cannot be reused. At the same time, attention should be paid to the process quality, technical inspection, and remedial measures (such as correction, polishing, etc.) when making connections.

[0022] A threaded connection is a detachable connection in which threaded parts (or the threaded portion of the connected parts) are joined together as one unit.

[0023] A sliding connection refers to two objects that are in contact but not fixed, and can slide relative to each other.

[0024] A rotating connection is a connection between parts that allows the parts to rotate relative to each other.

[0025] The beneficial effects of this utility model are:

[0026] The rock specimen is placed on the support platform. The rock specimen is clamped by the clamping plate by rotating the threaded column, thus fixing it in place. The height of the suspension plate is adjusted by rotating the third threaded rod, which in turn adjusts the height of the cutting mechanism. Rotating the first threaded rod moves the moving seat, which in turn moves the support platform, which in turn moves the rock specimen. When the rock specimen passes the cutting mechanism, the cutting blade on the cutting mechanism cuts the rock specimen once. Continuing to rotate the first threaded rod, when the cylinder contacts the inclined surface at the end of the adjusting block, the cylinder moves along the inclined surface to the upper end face of the adjusting block. During this process, the connecting rod moves upward, lifting the rack, causing the gear to mesh with the rack. Simultaneously, the connecting rod pulls the adjusting plate upward, compressing the spring at the top of the adjusting plate until the cylinder leaves the upper end face of the adjusting block. At this point, the gear and rack... The meshing of the gears causes them to rotate, which in turn drives the second threaded rod to rotate. The second threaded rod then moves the support platform, which in turn moves the rock specimen. This causes the cut on the rock specimen to deviate from the cutting trajectory. The first threaded rod is then rotated in the opposite direction. When the cylinder contacts the inclined surface at the other end of the adjusting block, the cylinder moves along the inclined surface to the lower end of the adjusting block. During this process, the connecting rod moves downward, causing the rack and gear to separate. At the same time, the connecting rod moves the adjusting plate downward, compressing the spring at the lower end of the adjusting plate until the cylinder leaves the lower end of the adjusting block. The first threaded rod continues to rotate, moving the rock specimen and causing it to be cut again by the cutting blade on the cutting mechanism. This process is repeated to achieve multiple cuts at different positions on the rock specimen. After multiple cuts, a rectangular cut is formed on the rock specimen. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0029] Figure 2 This is a partial structural diagram of the movable seat in an embodiment of the present utility model;

[0030] Figure 3 This is a partial schematic diagram of the gear rack in an embodiment of this utility model;

[0031] Figure 4 This is a schematic diagram of the cutting mechanism structure according to an embodiment of the present utility model. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0033] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around" and other terms indicating orientation or positional relationship are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] Based on the concept of this application, combined with Figures 1 to 4This describes an embodiment of a cutting device for cutting rock specimens. Specifically, the cutting device for cutting rock specimens is constructed as a split structure, comprising a base 1, a gear 9, and a wall column 18, among other components that work together. The rock specimen is placed on a support platform 5. Rotating the threaded column 7 causes the clamping plate 8 to clamp the rock specimen, thus fixing it in place. Rotating the third threaded rod 20 adjusts the height of the suspension plate 22, thereby adjusting the height of the cutting mechanism 23. Rotating the first threaded rod 2 moves the movable seat 3, which in turn moves the support platform 5. Platform 5 moves the rock specimen. When the rock specimen passes the cutting mechanism 23, the cutting blade 26 on the cutting mechanism 23 cuts the rock specimen once. The first threaded rod 2 continues to rotate. When the cylinder 16 contacts the inclined surface 35 at the end of the adjusting block 17, the cylinder 16 moves along the inclined surface 35 to the upper end of the adjusting block 17. During this process, the connecting rod 11 moves upward to lift the rack 10, causing the gear 9 to mesh with the rack 10. Simultaneously, the connecting rod 11 pulls the adjusting plate 12 upward, and the spring 15 at the upper end of the adjusting plate 12... The cylinder 16 is compressed until it leaves the upper surface of the adjusting block 17. At this point, the gear 9 rotates during the meshing of the gear 9 and the rack 10. The rotation of the gear 9 drives the second threaded rod 4 to rotate, which in turn drives the support platform 5 to move. The support platform 5 then moves the rock specimen, causing the cut on the rock specimen to deviate from the cutting trajectory. The first threaded rod 2 then rotates in the opposite direction. When the cylinder 16 contacts the inclined surface 35 at the other end of the adjusting block 17, the cylinder 16 moves along the inclined surface 35 to the adjusting block 17. At the lower end of 7, during this process, the connecting rod 11 moves down, causing the rack 10 to separate from the gear 9. At the same time, the connecting rod 11 will drive the adjusting plate 12 to move down, and the spring 15 at the lower end of the adjusting plate 12 will be compressed until the cylinder 16 leaves the lower end of the adjusting block 17. The first threaded rod 2 continues to rotate, causing the rock specimen to move, so that the rock specimen is cut again by the cutting blade 26 on the cutting mechanism 23. This process is repeated to achieve multiple cuts at different positions of the rock specimen. After multiple cuts, a rectangular cut is formed on the rock specimen.

[0035] like Figures 1 to 4 As shown, a cutting device for cutting rock specimens includes:

[0036] A base 1 is rotatably connected to a first threaded rod 2 at its upper end. A movable seat 3 is threadedly connected to the first threaded rod 2. A second threaded rod 4 is rotatably connected to the upper end of the movable seat 3. A bearing platform 5 is threadedly connected to the second threaded rod 4. Fixing plates 6 are fixedly connected to both ends of the bearing platform 5. Threaded posts 7 are threadedly connected to the two fixing plates 6 on the same side of the bearing platform 5. A clamping plate 8 is fixedly connected to the inner end of the threaded post 7.

[0037] A gear 9 is fixedly connected to one end of the second threaded rod 4. A rack 10 is provided below the gear 9. A connecting rod 11 is fixedly connected to the lower end of the rack 10. An adjusting plate 12 is fixedly connected to the other end of the connecting rod 11. Two sliding rods 13 are slidably connected on the adjusting plate 12. The sliding rods 13 are fixedly connected inside the fixing frame 14. The fixing frame 14 is fixedly connected to the lower end of the base 1. Springs 15 are fitted on the sliding rods 13 on both sides of the adjusting plate 12. A cylinder 16 is fixedly connected to the inner side of the connecting rod 11. An adjusting block 17 is provided at the cylinder 16. The adjusting block 17 is fixedly connected to the movable seat 3. Inclined surfaces 35 are provided at both ends of the adjusting block 17.

[0038] A wall column 18 is fixedly connected to one end of the base 1. A sliding groove 19 is provided on the wall column 18. A third threaded rod 20 is rotatably connected in the sliding groove 19. A first slider 21 that slides in the sliding groove 19 is threadedly connected to the third threaded rod 20. A suspension plate 22 is fixedly connected to the first slider 21. A cutting mechanism 23 is installed on the suspension plate 22.

[0039] In use, the rock specimen is placed on the support platform 5. The rock specimen is clamped by the clamping plate 8 by rotating the threaded rod 7, thus fixing the specimen in place. The height of the suspension plate 22 is adjusted by rotating the third threaded rod 20, which in turn adjusts the height of the cutting mechanism 23. Rotating the first threaded rod 2 moves the moving seat 3, which in turn moves the support platform 5, which in turn moves the rock specimen. When the rock specimen passes the cutting mechanism 23, the cutting blade 26 on the cutting mechanism 23 cuts the rock specimen once. Continuing to rotate the first threaded rod 2, when the cylinder 16 contacts the inclined surface 35 at the end of the adjusting block 17, the cylinder 16 moves along the inclined surface 35 to the upper surface of the adjusting block 17. During this process, the connecting rod 11 moves upward, lifting the rack 10, causing the gear 9 to mesh with the rack 10. Simultaneously, the connecting rod 11 pulls the adjusting plate 12 upward, compressing the spring 15 at the upper end of the adjusting plate 12, until the cylinder 16 leaves the upper surface of the adjusting block 17. At this point, the rock specimen is... The meshing of gear 9 and rack 10 causes gear 9 to rotate during this process. The rotation of gear 9 drives the second threaded rod 4 to rotate, which in turn drives the support platform 5 to move. The support platform 5 then moves the rock specimen, causing the cut on the rock specimen to deviate from the cutting trajectory. Then, the first threaded rod 2 rotates in the opposite direction. When cylinder 16 contacts the inclined surface 35 at the other end of the adjusting block 17, cylinder 16 moves along the inclined surface 35 to the lower end of the adjusting block 17. During this process, connecting rod 11 moves down, causing rack 10 to separate from gear 9. At the same time, connecting rod 11 drives adjusting plate 12 to move down, and spring 15 at the lower end of adjusting plate 12 is compressed until cylinder 16 leaves the lower end of adjusting block 17. The first threaded rod 2 continues to rotate, causing the rock specimen to move. The rock specimen is then cut again by the cutting blade 26 on the cutting mechanism 23. This process is repeated to achieve multiple cuts at different positions on the rock specimen. After multiple cuts, a rectangular cut is formed on the rock specimen.

[0040] The lower end of the movable seat 3 is fixedly connected to a movable block 34, which is threaded onto the first threaded rod 2. When the first threaded rod 2 rotates, it drives the movable block 34 to move, and the movable block 34 drives the movable seat 3 to move the rock specimen on the cutting path.

[0041] In one embodiment of this utility model, the cutting mechanism 23 includes a support arm 24 fixedly connected to the suspension plate 22, a first motor 25 fixedly connected to the support arm 24, and a cutting blade 26 fixedly connected to the output end of the first motor 25. The first motor 25 drives the cutting blade 26 to rotate at high speed to cut the rock specimen.

[0042] In one embodiment of this utility model, in order to drive the third threaded rod 20 to rotate, a second motor 27 is fixedly connected to the top of the wall column 18, and the output end of the second motor 27 is fixedly connected to the third threaded rod 20.

[0043] In one embodiment of this utility model, to ensure the stability of the movable seat 3, slide rails 28 parallel to the first threaded rod 2 are provided on both sides of the first threaded rod 2. The slide rails 28 are fixedly connected to the base 1, and a second slider 29 is slidably connected to the slide rails 28. The second slider 29 is fixedly connected to the lower end of the movable seat 3. When the movable seat 3 moves, it can drive the second slider 29 to move along the slide rails 28, ensuring the stability of the movable seat 3.

[0044] In one embodiment of this utility model, in order to improve the stability of the support platform 5 when it moves, guide rods 30 parallel to the second threaded rod 4 are provided on both sides of the second threaded rod 4. The guide rods 30 are slidably connected to the support platform 5, and the two ends of the guide rods 30 are fixedly connected to the ends of the movable seat 3.

[0045] In one embodiment of this utility model, a third motor 31 is fixedly connected to one end of the first threaded rod 2 to facilitate rotation of the first threaded rod 2.

[0046] In one embodiment of this utility model, when the rock specimen is moved without the meshing of gear 9 and rack 10, a second rotating member can be fixedly connected to the other end of the second threaded rod 4, and the second threaded rod 4 can be driven to rotate by rotating the second rotating member.

[0047] In one embodiment of this utility model, in order to facilitate the rotation of the threaded column 7, a third rotating member 33 is fixedly connected to the outer end of the threaded column 7.

[0048] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims of this utility model.

Claims

1. A cutting device for cutting rock specimens, characterized in that, Include: The base (1), the upper end of the base (1) is rotatably connected with the first threaded rod (2), the first threaded rod (2) is threadedly connected with the moving seat (3), the upper end of the moving seat (3) is rotatably connected with the second threaded rod (4), the second threaded rod (4) is threadedly connected with the bearing table (5), the two ends of the bearing table (5) are fixedly connected with the fixed plate (6), the two fixed plates (6) on the same side of the bearing table (5) are threadedly connected with the threaded column (7), and the inner side end of the threaded column (7) is fixedly connected with the clamping plate (8). One end of the second threaded rod (4) is fixedly connected with a gear (9), a rack (10) is arranged below the gear (9), the lower end of the rack (10) is fixedly connected with a connecting rod (11), the other end of the connecting rod (11) is fixedly connected with an adjusting plate (12), two slide rods (13) are slidably connected on the adjusting plate (12), the slide rods (13) are fixedly connected in the fixed frame (14), the fixed frame (14) is fixedly connected at the lower end of the base (1), springs (15) are sleeved on the slide rods (13) on the two sides of the adjusting plate (12), a cylinder (16) is fixedly connected inside the connecting rod (11), an adjusting block (17) is arranged at the cylinder (16), the adjusting block (17) is fixedly connected with the moving seat (3), and inclined surfaces (35) are arranged at the two ends of the adjusting block (17). A wall column (18) is fixedly connected to one end of the base (1), a sliding groove (19) is formed in the wall column (18), a third threaded rod (20) is rotatably connected in the sliding groove (19), a first sliding block (21) slidably connected in the sliding groove (19) is threadedly connected on the third threaded rod (20), a hanging plate (22) is fixedly connected on the first sliding block (21), and a cutting mechanism (23) is mounted on the hanging plate (22).

2. The cutting apparatus for cutting of rock specimens according to claim 1, characterized in that, The cutting mechanism (23) comprises a support arm (24) fixedly connected on the hanging plate (22), a first motor (25) fixedly connected on the support arm (24), and a cutting blade (26) fixedly connected to the output end of the first motor (25).

3. A cutting apparatus for cutting a rock sample according to claim 2, wherein, The top end of the wall column (18) is fixedly connected with a second motor (27), and the output end of the second motor (27) is fixedly connected with the third threaded rod (20).

4. The cutting apparatus for cutting of rock specimens according to claim 3, characterized in that, The two sides of the first threaded rod (2) are provided with slide rails (28) parallel to the first threaded rod (2), the slide rails (28) are fixedly connected on the base (1), a second sliding block (29) is slidably connected on the slide rails (28), and the second sliding block (29) is fixedly connected at the lower end of the moving seat (3).

5. A cutting apparatus for cutting a rock sample according to claim 4, wherein, The two sides of the second threaded rod (4) are provided with guide rods (30) parallel to the second threaded rod (4), the guide rods (30) are slidably connected with the bearing table (5), and the two ends of the guide rods (30) are fixedly connected with the ends of the moving seat (3).

6. The cutting apparatus for cutting of rock specimens of claim 1, wherein, One end of the first threaded rod (2) is fixedly connected with a third motor (31).

7. The cutting apparatus for cutting of rock specimens according to claim 1, wherein, The other end of the second threaded rod (4) is fixedly connected with a second rotating piece (32).

8. The cutting apparatus for cutting of rock specimens according to claim 1, wherein, The outer end of the threaded column (7) is fixedly connected with a third rotating member (33).