A high-precision, pollution-free grinding device for biological fossils and its usage method

Abstract

This invention discloses a grinding device for biological fossils, relating to the field of biological fossil material grinding and analysis technology in geology and paleontology. Specifically, it relates to a high-precision, pollution-free grinding device for biological fossils and its method of use. It includes a receiving assembly and a grinding assembly disposed on top of the receiving assembly. In this invention, a rotating reciprocating structure drives a crushing structure to move up and down. When the crushing structure moves downward to grind the biological fossil, it causes a second fixed structure to detach from the grinding surface and draw in air. When the crushing structure moves upward, it causes the second fixed structure to contact the grinding surface and blow out airflow to remove residual impurities from the grinding surface, thereby achieving high-precision grinding of the designated grinding surface of the biological fossil and preparation of geochemical powders.

Description

Technical Field

[0001] This invention relates to the field of grinding and analysis technology of biological fossil materials in geology and paleontology, and more specifically, to a high-precision, pollution-free grinding device for biological fossils and its usage method. Background Technology

[0002] Fossils refer to the remains and traces of life of organisms formed and preserved in strata during prehistoric geological history. They include plant fossils, invertebrate fossils, and vertebrate fossils (such as belemnites, bivalves, dinosaur teeth, rhinoceros leg bones, etc.). Fossils are not only scientific evidence for studying the origin and evolution of life, but also the most direct scientific material for studying paleoecological conditions. Paleontologists and geologists have discovered more and more prehistoric fossils during field scientific expeditions, enabling humans to gain a clearer understanding of the environment in which the Earth once existed and the appearance of life on Earth.

[0003] When geologists and paleontologists study fossils indoors, they first need to remove the surface material covering the fossils, then grind the specific parts that need to be studied to observe the internal biological structure (such as ornamentation, chamber structure, shell structure, etc.), and collect the powder after grinding to carry out further geochemical research and analysis.

[0004] For example, CN209158043U discloses a novel fossil grinding device, including a grinding plate with a grinding groove, a pressure plate above the grinding plate, a through hole in the middle of the pressure plate, the through hole being connected to an inner sleeve, a copper column inside the inner sleeve, an outer sleeve with an open bottom fitting on the upper part of the inner sleeve, an adjustment through hole at the top of the outer sleeve, a gasket above the outer sleeve, an adjustment hole coaxial with the adjustment through hole at the top of the copper column, an adjustment screw with its lower part inserted through the gasket into the adjustment through hole and the adjustment hole, the adjustment screw engaging with the adjustment through hole and the adjustment hole respectively, an upper grinding groove on the bottom surface of the pressure plate aligned with the grinding groove, a cavity between the upper grinding groove and the grinding groove being a grinding chamber, a steel ball inside the grinding chamber, the upper surface of the steel ball contacting the top surface of the grinding chamber, and the lower surface of the steel ball contacting the bottom surface of the grinding chamber;

[0005] However, although the grinding device in this patent is portable and can be used by geologists and paleontologists to study fossil grinding discs in the field and indoors, the device simply places the fossil on the grinding plate under the copper pillar. As the fossil is ground, its shape changes and it inevitably shakes during the grinding process, changing the relative position between the fossil and the grinding plate. As a result, the contact surface between the fossil and the grinding structure is no longer the originally designated grinding surface, and the position of the fossil needs to be readjusted. The grinding precision is low, the effect is poor, and it can also produce a large deviation in scientific research.

[0006] To avoid changes in the grinding surface at designated locations of fossils during grinding, and to accurately grind and collect powder from the designated areas to be studied, a high-precision, pollution-free grinding device for biological fossils and its usage method are proposed. Summary of the Invention

[0007] The purpose of this invention is to provide a high-precision, pollution-free grinding device for biological fossils and a method for using it, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, one of the objectives of this invention is to provide a high-precision, pollution-free grinding device for biological fossils, comprising a mounting assembly and a grinding assembly disposed on top of the mounting assembly.

[0009] The mounting assembly includes a tray for placing biological fossils, and the tray is provided with a plurality of first fixing structures for securing the biological fossils;

[0010] The grinding assembly includes a second fixing structure that is inserted and fitted into the tray. The second fixing structure is used to contact the grinding surface of the biological fossil and blow away impurities. The second fixing structure is rotatably connected to a reciprocating structure. The bottom of the reciprocating structure is connected to a crushing structure for crushing the biological fossil. The crushing structure is slidably connected to the second fixing structure. Rotating the reciprocating structure causes the crushing structure to move up and down. When the crushing structure moves downward, it causes the second fixing structure to detach from the grinding surface and draw in air until the crushing structure crushes and grinds the grinding surface. When the crushing structure moves upward, it causes the second fixing structure to contact the grinding surface and blow out airflow to remove residual impurities on the grinding surface.

[0011] As a further improvement to this technical solution, the tray is provided with a sample placement slot for placing biological fossils in the middle, and multiple columns are provided at the edge of the upper surface of the tray. The top of each column has a column opening. The second fixing structure includes a shell and an extension plate provided at one end of the bottom of the shell. Multiple first connecting rods are correspondingly provided at the bottom of the shell, and the bottom of the first connecting rods is inserted into the top of the column opening.

[0012] As a further improvement to this technical solution, the first fixing structure includes a telescopic rod with one end rotatably connected to the inner wall of the column, and the other end of the telescopic rod is connected to a contact head for contacting biological fossils.

[0013] As a further improvement to this technical solution, the bottom end of the extension plate is provided with a contact block for contacting and locking onto the grinding surface.

[0014] As a further improvement to this technical solution, the reciprocating structure includes a reciprocating rod and a first collar that is slidably connected to the outer wall of the reciprocating rod. The top of the reciprocating rod is rotatably connected to the top of the housing. A rotatable handle is provided at one end of the top of the reciprocating rod. The outer wall of the first collar is reciprocally threaded to the inner wall of the housing. The crushing structure includes a grinding disc and a second connecting rod provided on the top of the grinding disc. The grinding disc is connected to the first collar through the second connecting rod.

[0015] As a further improvement to this technical solution, a cone head with an inverted pointed cone structure is provided at the center of the bottom of the grinding disc, and a disc claw connected to the cone head is provided at the bottom edge of the grinding disc.

[0016] As a further improvement to this technical solution, the first ring is symmetrically provided with multiple ring openings that penetrate its upper and lower surfaces, and the top of the second connecting rod is provided with a spring, and the second connecting rod is connected to the inner wall of the ring opening through the provided spring.

[0017] As a further improvement to this technical solution, the extension plate is slidably connected to the contact block, the contact block is provided with a side plate, the surface of the grinding disc is fitted with a second collar, one end of the second collar is provided with a bottom plate shaft, and the second collar is slidably connected to the side plate through the bottom plate shaft.

[0018] As a further improvement to this technical solution, an air cavity is provided at the bottom edge of the casing, and an air inlet pipe is connected to the top of the air cavity. An air passage communicating with the air cavity is provided in the extension plate, and a one-way air valve is provided at the connection between the air passage and the air cavity. An air groove is provided through the top and side wall surfaces of the contact block, and the top of the air groove is connected to the bottom of the air passage. An annular plate is provided at the top of the second ring, and the annular plate is located inside the air cavity. The air cavity and the annular plate cooperate to form a closed space.

[0019] The second objective of this invention is to provide a method for using the aforementioned high-precision, pollution-free grinding device for biological fossils, comprising the following steps:

[0020] S1. First, support the bottom of the second fixing structure and lift it upwards. Then, place the fossil on the tray, adjust it so that the grinding surface of the fossil is aligned with the bottom of the broken structure, and then fix the bottom of the fossil through the first fixing structure.

[0021] S2. Loosen the second fixing structure. Under the gravity of the grinding assembly, the second fixing structure moves down and contacts the grinding surface of the biological fossil.

[0022] S3. The rotating reciprocating structure drives the crushing structure to move downward, thereby causing the second fixed structure to detach from the grinding surface and draw in air until the bottom of the crushing structure contacts and crushes and grinds the grinding surface. Sample powder is collected at the same time as grinding.

[0023] S4. The continuously rotating reciprocating structure drives the crushing structure to move upward, which in turn drives the second fixed structure to contact the grinding surface and blow out airflow to remove residual impurities on the grinding surface. The above process is repeated until the grinding of the biological fossil is completed.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. In this high-precision, pollution-free grinding device for biological fossils and its usage method, the reciprocating rotating structure drives the crushing structure to move up and down. When the crushing structure moves downward to grind the biological fossils, it will cause the second fixed structure to detach from the grinding surface and draw in air. When the crushing structure moves upward, it will cause the second fixed structure to contact the grinding surface and blow out airflow to remove residual impurities on the grinding surface, thereby achieving high-precision grinding treatment of the biological fossil grinding surface.

[0026] 2. In this high-precision, pollution-free grinding device for biological fossils and its usage method, the contact head is fixed to the bottom of the biological fossil by means of a telescopic rod. The biological fossil is fixed by multiple contact heads at multiple points to prevent the biological fossil from shaking during the processing and to ensure high-precision processing of the designated grinding position of the biological fossil.

[0027] 3. In this high-precision, pollution-free grinding device for biological fossils and its usage method, when the grinding disc moves toward the grinding surface, the second ring can drive the contact block to move away from the grinding surface. When the grinding disc contacts the grinding surface, the contact block just separates and does not contact the grinding surface, thereby avoiding obstructing the rotation of the grinding disc and ensuring the grinding effect on the designated grinding position of the biological fossil. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a cross-sectional view of the overall structure of the present invention;

[0030] Figure 3 This is a schematic diagram of the mounting component structure of the present invention;

[0031] Figure 4 This is a schematic diagram of the first fixing structure of the present invention;

[0032] Figure 5 This is a cross-sectional view of the grinding assembly of the present invention;

[0033] Figure 6 This is a cross-sectional view of the second fixing structure of the present invention;

[0034] Figure 7 This is a cross-sectional structural diagram of the contact block of the present invention;

[0035] Figure 8 This is a schematic diagram of the reciprocating structure of the present invention;

[0036] Figure 9 This is a cross-sectional view of the fractured structure of the present invention;

[0037] Figure 10 This is a second set of ring cross-sectional structural diagrams of the present invention.

[0038] The meanings of the labels in the diagram are as follows:

[0039] 1. Loading component; 11. Pallet; 111. Column; 112. Column opening; 12. First fixing structure; 121. Telescopic rod; 122. Contact head;

[0040] 2. Grinding assembly; 21. Second fixing structure; 211. Housing; 212. Extension plate; 213. First connecting rod; 214. Contact block; 2141. Side plate; 2142. Air groove; 215. Air chamber; 216. Air inlet pipe; 22. Reciprocating structure; 221. Reciprocating rod; 222. First collar; 223. Handle; 224. Ring opening; 23. Crushing structure; 231. Grinding disc; 232. Second connecting rod; 2321. Spring; 233. Cone head; 234. Disc claw; 235. Second collar; 2351. Base plate shaft; 2352. Ring plate. Detailed Implementation

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] Please see Figures 1-10 As shown, one of the objectives of this embodiment is to provide a high-precision, pollution-free grinding device for biological fossils, including a mounting assembly 1 and a grinding assembly 2 disposed on top of the mounting assembly 1.

[0045] The container assembly 1 includes a tray 11 for placing biological fossils, and the tray 11 is provided with a plurality of first fixing structures 12 for fixing the biological fossils.

[0046] The grinding assembly 2 includes a second fixing structure 21 that is vertically inserted into the tray 11. The second fixing structure 21 is used to contact the grinding surface of the fossil and blow away impurities. The second fixing structure 21 is rotatably connected to a reciprocating structure 22. The bottom of the reciprocating structure 22 is connected to a crushing structure 23 for crushing the fossil. The crushing structure 23 is slidably connected to the second fixing structure 21. First, the bottom of the second fixing structure 21 is supported and lifted upwards. Then, the fossil to be ground is placed on the tray 11, so that the designated grinding surface of the fossil is aligned with the bottom of the crushing structure 23. The bottom of the fossil is then fixed by the first fixing structure 12. The second fixing structure 21 is then released, and the grinding process continues. Under the influence of gravity, the second fixed structure 21 moves downward until its bottom contacts the grinding surface of the biological fossil. The reciprocating structure 22 drives the crushing structure 23 to move up and down. When the crushing structure 23 moves downward, it will cause the second fixed structure 21 to detach from the grinding surface and draw in air until the bottom of the crushing structure 23 contacts the grinding surface and crushes and grinds it. At the same time, the powder generated by grinding is collected. When the reciprocating structure 22 continues to rotate and drives the crushing structure 23 to move upward, it will cause the second fixed structure 21 to contact the grinding surface and blow out airflow to remove residual impurities on the grinding surface. The above process is repeated until the grinding process of the biological fossil is completed, so as to achieve high-precision grinding of the grinding surface of the biological fossil and powder collection.

[0047] The above structure is disclosed below:

[0048] First, the grinding assembly 2 needs to be raised to leave a certain space so that the biological fossils can be placed on the tray 11. The tray 11 has a sample placement groove in the middle for placing biological fossils. The sample placement groove is a groove with multiple openings through the bottom of the tray 11. Multiple pillars 111 are provided at the edge of the upper surface of the tray 11. The top of the pillars 111 has a column opening 112. The second fixing structure 21 includes a shell 211 and an extension plate 212 set at one end of the bottom of the shell 211. Multiple first connecting rods 213 are correspondingly provided at the bottom of the shell 211. The bottom of the first connecting rod 213 is located inside the column opening 112. The bottom of the first connecting rod 213 is inserted into the top of the column opening 112. By supporting the bottom of the second fixing structure 21, the second fixing structure 21 is moved upward, thereby making it easier to leave space for the biological fossil material to pass through.

[0049] Next, place the fossil into the sample placement tank. After aligning the grinding surface of the fossil with the bottom of the crushing structure 23, the fossil needs to be fixed to prevent it from shaking during grinding. The first fixing structure 12 includes a telescopic rod 121 with one end rotatably connected to the inner wall of the column 111. The other end of the telescopic rod 121 is connected to a contact head 122 for contacting the fossil. The telescopic rod 121 drives the contact head 122 to contact and fix it to the bottom of the fossil. The fossil is fixed by multiple contact heads 122 at multiple points to prevent it from shaking during processing and ensure high-precision processing of the designated grinding area of ​​the fossil.

[0050] After the fossil is fixed, the distance between the bottom of the second fixing structure 21 and the tray 11 needs to be adjusted to ensure that the reciprocating structure 22 can drive the crushing structure 23 to contact the grinding surface for grinding. The bottom end of the extension plate 212 is provided with a contact block 214 for contacting and locking onto the grinding surface. The second fixing structure 21 is released so that the second fixing structure 21 moves downward under the gravity of the grinding component 2 until the bottom end of the contact block 214 is locked onto the grinding surface. This avoids the problem that the crushing structure 23 cannot contact and grind the fossil because the distance between the crushing structure 23 and the fossil is too large.

[0051] Next, the biological fossils are ground. The reciprocating structure 22 includes a reciprocating rod 221 and a first collar 222 that slides vertically and vertically connected to the outer wall of the reciprocating rod 221. The top of the reciprocating rod 221 passes through the top of the casing 211, and the top of the reciprocating rod 221 is rotatably connected to the top of the casing 211. A rotatable handle 223 is provided at one end of the top of the reciprocating rod 221. The outer wall of the first collar 222 is reciprocally threaded to the inner wall of the casing 211. The crushing structure 23 includes a grinding disc 231 and a second connecting rod 232 provided on the top of the grinding disc 231. The grinding disc 231 is connected to the first collar 222 through the second connecting rod 232. The user holds it with one hand. A handle on the surface of the housing 211 prevents the device from shaking. The other hand holds the handle 223 to drive the reciprocating rod 221 to rotate inside the housing 211. Since the first collar 222 is slidably connected to the reciprocating rod 221 and is reciprocally threaded to the inner wall of the housing 211, the rotation of the reciprocating rod 221 drives the first collar 222 to rotate. At the same time, the first collar 222 moves up and down along the reciprocating rod 221, so that the reciprocating rod 221 can drive the grinding disc 231 to move up and down and rotate through the first collar 222. When the grinding disc 231 moves down to the bottom and contacts the grinding surface, the rotating grinding disc 231 can grind the grinding surface.

[0052] Furthermore, a cone head 233 with an inverted pointed cone structure is provided at the center of the bottom of the grinding disc 231, and a disc claw 234 connected to the cone head 233 is provided at the bottom edge of the grinding disc 231. When the reciprocating rod 221 drives the grinding disc 231 to move downward, the cone head 233 first contacts the grinding surface, and the cone head 233 breaks the surface of the grinding surface with the help of the pointed cone structure. Then, the disc claw 234 at the bottom of the rotating grinding disc 231 grinds the broken surface to remove the coating on the surface of the biological fossil, which can accelerate the processing speed of the biological fossil. Moreover, by first determining the breaking point of the grinding surface with the cone head 233, and then performing surface grinding with the disc claw 234, the accuracy can be improved.

[0053] In addition, the first ring 222 is symmetrically provided with multiple ring openings 224 that penetrate its upper and lower surfaces. The top of the second connecting rod 232 passes through the ring opening 224. A spring 2321 is provided on the top of the second connecting rod 232. The second connecting rod 232 is connected to the inner wall of the ring opening 224 through the spring 2321. By providing the spring 2321, when the reciprocating rod 221 drives the bottom of the grinding disk 231 to contact the grinding surface, as the reciprocating rod 221 drives the first ring 222 to continue to move downward, the first ring 222 pulls the spring 2321 downward, so that the first ring 222 can apply a force towards the grinding surface to the grinding disk 231 through the spring 2321, thereby improving the grinding efficiency of the disk claw 234.

[0054] Considering that the contact block 214 stuck on the grinding surface during grinding will hinder the rotation of the grinding disc 231, in order to avoid affecting the grinding effect on the biological fossil, the extension plate 212 is slidably connected to the contact block 214. The contact block 214 is provided with a side plate 2141. A second ring 235 is sleeved on the surface of the grinding disc 231. A bottom plate shaft 2351 is provided at the bottom of one end of the second ring 235. The second ring 235 is slidably connected to the side plate 2141 through the bottom plate shaft 2351. When the grinding disc 231 moves towards the grinding surface, the second ring 235 can drive the contact block 214 slidably connected to it to move along the extension plate 212 away from the grinding surface. When the grinding disc 231 contacts the grinding surface, the contact block 214 just disengages and does not contact the grinding surface, thereby avoiding hindering the rotation of the grinding disc 231 and ensuring the grinding effect and accuracy of the biological fossil.

[0055] As the reciprocating rod 221 continues to rotate, it drives the grinding disc 231 to move upward and detach from the grinding surface. At this time, there will be residual powder impurities formed by grinding on the grinding surface. In order to avoid affecting the grinding disc 231's processing of the grinding surface in the next reciprocating cycle, the powder impurities need to be removed. A gas cavity 215 with an inverted "U" shaped cross-section is opened at the bottom edge of the housing 211. An air inlet pipe 216 is connected to the top of the gas cavity 215. The air inlet pipe 216 is used to control the airflow to flow into the gas cavity 215 in one direction. An air passage communicating with the gas cavity 215 is opened in the extension plate 212. A one-way air valve is set at the connection between the air passage and the gas cavity 215 to control the gas to flow out of the gas cavity 215 in one direction. An air groove 2142 is opened in the contact block 214, penetrating its top and side wall surfaces. The top of the air groove 2142 is connected to the bottom of the air passage. The top of the second collar 235 is provided with a connection to the gas cavity 214. A matching ring plate 2352 is located within the air chamber 215, and rubber gaskets for maintaining airtightness are provided on the inner and outer walls of the ring plate 2352. The air chamber 215 and the ring plate 2352 cooperate to form a closed space. When the grinding disc 231 moves down, the ring plate 2352 moves down along the air chamber 215, which increases the volume of the closed space and creates a negative pressure in the closed space, drawing outside air into the closed space from the air inlet pipe 216. During the process of the grinding disc 231 moving up and the contact block 214 resetting and locking the grinding surface, the ring plate 2352 moves up along the air chamber 215. The air in the closed space is compressed and enters the air passage through the one-way air valve, and then moves towards the grinding surface through the air groove 2142 connected to the air passage. The air blows away the residual powder impurities on the grinding surface, avoiding affecting the grinding process of the grinding disc 231 on the grinding surface and causing contamination.

[0056] The second objective of this embodiment is to provide a method for using the high-precision, pollution-free grinding device for biological fossils described above, comprising the following steps:

[0057] S1. First, support the bottom of the second fixing structure 21 and lift it upwards. Then, place the fossil on the tray 11 and adjust it so that the grinding surface of the fossil is aligned with the bottom of the crushing structure 23. Then, fix the bottom of the fossil through the first fixing structure 12.

[0058] S2. Release the second fixing structure 21. Under the gravity of the grinding component 2, the second fixing structure 21 moves down and contacts the grinding surface of the biological fossil.

[0059] S3. The rotating reciprocating structure 22 drives the crushing structure 23 to move downward, thereby driving the second fixed structure 21 to detach from the grinding surface and draw in air until the bottom of the crushing structure 23 contacts and crushes and grinds the grinding surface. At the same time as the grinding process, powder can be collected for geochemical research.

[0060] S4. The continuously rotating reciprocating structure 22 drives the crushing structure 23 to move upward, which in turn drives the second fixed structure 21 to contact the grinding surface and blow out airflow to remove residual impurities on the grinding surface. The above process is repeated until the grinding treatment of the biological fossil is completed, so as to achieve high-precision grinding treatment of the grinding surface of the designated part of the biological fossil.

[0061] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision, pollution-free grinding device for biological fossils, characterized in that: Includes a mounting assembly (1) and a grinding assembly (2) disposed on top of the mounting assembly (1); The mounting assembly (1) includes a tray (11) for placing biological fossils, and the tray (11) is provided with a plurality of first fixing structures (12) for fixing biological fossils. The grinding assembly (2) includes a second fixing structure (21) that is inserted into the tray (11). The second fixing structure (21) is used to contact the grinding surface of the biological fossil and blow away impurities. The second fixing structure (21) is rotatably connected to a reciprocating structure (22). The bottom of the reciprocating structure (22) is connected to a crushing structure (23) for crushing the biological fossil. The crushing structure (23) is slidably connected to the second fixing structure (21). The crushing structure (23) moves down to drive the second fixing structure (21) away from the grinding surface and suck in air until the crushing structure (23) crushes and grinds the grinding surface. The crushing structure (23) moves up to drive the second fixing structure (21) to contact the grinding surface and blow away impurities.

2. The high-precision, pollution-free grinding device for biological fossils according to claim 1, characterized in that: The tray (11) has a sample placement slot in the middle for placing biological fossils. Multiple columns (111) are provided at the edge of the upper surface of the tray (11). The top of the column (111) is provided with a column opening (112). The second fixing structure (21) includes a shell (211) and an extension plate (212) provided at one end of the bottom of the shell (211). Multiple first connecting rods (213) are provided at the bottom of the shell (211). The bottom of the first connecting rod (213) is inserted into the top of the column opening (112).

3. The high-precision, pollution-free grinding device for biological fossils according to claim 2, characterized in that: The first fixed structure (12) includes a telescopic rod (121) with one end rotatably connected to the inner wall of the column (111), and the other end of the telescopic rod (121) is connected to a contact head (122) for contacting biological fossils.

4. The high-precision, pollution-free grinding device for biological fossils according to claim 2, characterized in that: The bottom end of the extension plate (212) is provided with a contact block (214) for contacting and locking onto the grinding surface.

5. The high-precision, pollution-free grinding device for biological fossils according to claim 4, characterized in that: The reciprocating structure (22) includes a reciprocating rod (221) and a first collar (222) slidably connected to the outer wall of the reciprocating rod (221). The reciprocating rod (221) is rotatably connected to the top of the housing (211). A handle (223) is provided at one end of the top of the reciprocating rod (221). The outer wall of the first collar (222) is threadedly connected to the inner wall of the housing (211). The crushing structure (23) includes a grinding disc (231). The grinding disc (231) is connected to the first collar (222) through a second connecting rod (232).

6. The high-precision, pollution-free grinding device for biological fossils according to claim 5, characterized in that: The grinding disc (231) has a cone head (233) with an inverted cone structure at the bottom center, and the grinding disc (231) has a disc claw (234) at the bottom edge that is connected to the cone head (233).

7. The high-precision, pollution-free grinding device for biological fossils according to claim 5, characterized in that: The first collar (222) has multiple symmetrical openings (224), and the top of the second connecting rod (232) is provided with a spring (2321). The second connecting rod (232) is connected to the inner wall of the opening (224) through the spring (2321).

8. The high-precision, pollution-free grinding device for biological fossils according to claim 5, characterized in that: The extension plate (212) is slidably connected to the contact block (214). The contact block (214) is provided with a side plate (2141). A second collar (235) is sleeved on the surface of the grinding disc (231). The second collar (235) is slidably connected to the side plate (2141) through a bottom plate shaft (2351).

9. The high-precision, pollution-free grinding device for biological fossils according to claim 8, characterized in that: An air chamber (215) is provided at the bottom edge of the casing (211). An air inlet pipe (216) is connected to the top of the air chamber (215). An air passage communicating with the air chamber (215) is provided in the extension plate (212). A one-way air valve is provided at the connection between the air passage and the air chamber (215). An air groove (2142) is provided through the top and side wall surfaces of the contact block (214). The top of the air groove (2142) is connected to the bottom of the air passage. A ring plate (2352) is provided at the top of the second ring (235). The ring plate (2352) is located in the air chamber (215).

10. A method using the high-precision, pollution-free grinding apparatus for biological fossils as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. First, support the bottom of the second fixing structure (21) and lift it upwards. Then place the fossil on the tray (11), adjust it so that the grinding surface of the fossil is aligned with the bottom of the crushing structure (23), and then fix the bottom of the fossil through the first fixing structure (12). S2. Loosen the second fixing structure (21). Under the gravity of the grinding assembly (2), the second fixing structure (21) moves down and contacts the grinding surface of the biological fossil. S3. The rotating reciprocating structure (22) drives the crushing structure (23) to move downward, thereby driving the second fixed structure (21) to detach from the grinding surface and draw in air until the bottom of the crushing structure (23) contacts and crushes and grinds the grinding surface. S4. The continuously rotating reciprocating structure (22) drives the crushing structure (23) to move upward, thereby driving the second fixed structure (21) to contact the grinding surface and blow out airflow to remove residual impurities on the grinding surface. Repeat the above process until the grinding of biological fossils is completed.

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