Tree core grinding unit and tree core grinding device

Abstract

The present invention proposes a tree core grinding unit and a tree core grinding device, which are used for preparing tree core samples in the process of forestry survey sampling. Compared with the existing technology, the tree core grinding unit and the tree core grinding device of the present invention both realize semi-automatic or fully automatic control, and do not need to be held hand, so there is no danger and no hand injury during precision grinding; the tree core grinding unit can absorb wood debris on the surface of the tree core during its own rotation, and switch the grinding with sandpaper of different particle sizes. The surface of the tree core will be polished smoother and finer without debris residue, which is convenient for more clearly distinguishing the shape and size of the cells on the surface of the wood core under a stereo microscope, and then more accurately determining the tree ring boundaries, laying the foundation for accurately understanding the age of the tree and evaluating the impact of the ecological environment on tree growth.

Description

Technical Field

[0001] The present invention relates to the field of grinding, and in particular to a tree core grinding unit and a tree core grinding device. Background Art

[0002] During the forestry survey and sampling process, tree core samples are collected to understand the age of trees and evaluate the impact of the ecological environment on tree growth. The core samples are usually obtained by drilling holes into the trunk without affecting the survival of the tree, and obtaining strip-shaped core samples. After finely polishing the core samples, the shape and size of the cells on the surface of the core wood are distinguished under a microscope, and then the tree ring boundaries are determined more accurately, the age of the tree is inferred, and the specific impact of the environment on tree growth is evaluated based on the size of the annual rings and the morphology of the cells. Since the strip-shaped core samples are fragile and easy to break, the broken core samples need to be arranged in the original order and placed in a special wooden groove for fixation. They can only be polished after fixation is completed. The core polishing devices commonly used in the existing technology (such as Figure 1 As shown), they are usually purchased from the market and used in combination. This type of tree core grinding device has disadvantages in use: it is not a special tree core grinding device and is not targeted; the grinding machine is handheld electric, and fine grinding is very dangerous and may hurt your hands.

[0003] In addition, existing tree cores are usually manually held and polished individually, which is inefficient. After a long time of polishing, the roughness of the sandpaper decreases, which in turn leads to a decrease in the efficiency of tree core polishing. At this time, it is necessary to replace the sandpaper with a larger mesh size for polishing. Manual replacement is very troublesome and inefficient. On the other hand, some wood debris remaining on the surface of the tree core will affect the accurate identification of the shape and size of the cells on the surface of the wood core. Summary of the Invention

[0004] In order to solve the technical difficulties in the above-mentioned background technology, the present invention proposes a tree core grinding unit and a tree core grinding device. The specific technical solutions are as follows:

[0005] A tree core grinding unit is used to grind and clean multiple tree core surfaces at the same time, and the tree core grinding unit at least includes a grinding cylinder and an end cover, wherein the two ends of the grinding cylinder are connected by end covers, the outer circumference of the grinding cylinder is affixed with sandpaper, and the outer circumference of the grinding cylinder is also provided with a strip groove, the strip groove is located between the outer edges of the two sides of the sandpaper, and the strip groove has an air intake; the end cover has an end cover body, one end of the end cover body is connected to the grinding cylinder, and the other end is connected to an outer ring of a bearing, an inner ring of the bearing is connected to an adapter cylinder, the adapter cylinder is concentrically arranged with a slot, one end of the slot is fixedly connected to one end of the end cover body, and the other end of the slot is connected to the output shaft of a drive unit, the adapter cylinder is connected to an exhaust pipe, and the exhaust pipe is connected to the air path of the air intake.

[0006] The slot is movably connected to a special-shaped connecting piece, the slot can rotate coaxially with the special-shaped connecting piece, the special-shaped connecting piece is fixedly connected to the impeller, and the impeller rotates coaxially with the slot or the grinding cylinder.

[0007] The air inlet is a slit-type air inlet or a hole-type air inlet.

[0008] When the driving unit is started, the output shaft drives the slot to rotate, and then drives the grinding cylinder to rotate, and the sandpaper on the grinding cylinder can grind the tree core; during the grinding process, since the impeller and the output shaft rotate coaxially, the sealed cabin is in a negative pressure state, and the air intake draws residual wood debris from the surfaces of multiple tree cores and discharges it through the sealed cabin and the exhaust pipe, so that the grinding surface is cleaned.

[0009] A counterweight, a barrel ring, and sandpaper are sequentially arranged along the radial direction of the grinding barrel from inside to outside, wherein the sandpaper is attached to the outer periphery of the barrel ring, and the counterweight is arranged in an accommodating space formed by the barrel ring and the special-shaped connecting piece.

[0010] The longitudinal section of the special-shaped connecting piece is in the shape of a "mountain", and the special-shaped connecting piece has a columnar portion, a skirt portion and an annular flat plate portion that are connected to each other, wherein the columnar portion is circumferentially provided with an impeller, the columnar portion is vertically provided at the center of the flat plate portion, the skirt portion is vertically provided at the edge of the flat plate portion, and a cylinder ring is sandwiched between the skirt portion and the end cover body.

[0011] Another optional method is to sequentially arrange a skirt portion, a cylinder ring, and sandpaper along the radial direction of the grinding cylinder from inside to outside, wherein the sandpaper is attached to the outer periphery of the cylinder ring, and the cylinder ring is attached to the outer periphery of the skirt portion.

[0012] The adapter tube has an exhaust cavity, and a sealed cabin is formed between the flat plate portion of the special-shaped connector, the bearing 1, and the adapter tube. The sealed cabin is connected to the exhaust cavity air path. The skirt portion has an opening, and an intake pipe is connected to the tube ring, and the intake pipe is connected to the intake port air path.

[0013] A plurality of tree core clamps are arranged in the clamp. When the driving unit drives the tree core grinding unit to rotate, the clamp is pushed to the bottom of the tree core grinding unit to grind the surface of the tree core.

[0014] Furthermore, a tree core grinding device is proposed, comprising a plurality of the tree core grinding units, each tree core grinding unit having a different grit size of sandpaper, the tree core grinding unit being rotatably connected to the support rod of the drum rack, a plurality of support rods being arranged on a center wheel, the center wheel being rotatably connected to the drum rack bracket, the tree core grinding unit being driven by a driving unit, and during grinding, the surface of the tree core is firstly ground with low-grit sandpaper, and then the surface of the tree core is ground with high-grit sandpaper.

[0015] The driving unit includes a first driving unit and a second driving unit. The second driving unit is connected via a height-adjustable driving unit bracket. The driving unit can be a servo motor, a hydraulic pump, etc.

[0016] The tube rack bracket is connected to the tree core pushing unit, and the tree core pushing unit includes at least a fixed plate, a movable bracket and an adjustment bracket, wherein the tube rack bracket is fixed on the top of the fixed plate, and the fixed plate has a groove-shaped accommodating space formed along the length direction. A gear is arranged inside the accommodating space, and the gear is connected to a driving unit arranged outside the fixed plate.

[0017] The movable bracket includes two movable plates parallel to each other, the two movable plates are connected by a cross frame, a rack is arranged on the outer side of one movable plate, and the rack is meshed with the gear.

[0018] The top of the movable bracket is hinged to the bottom of the adjustment bracket, and the top of the adjustment bracket is hinged to the clamp. The clamp clamps multiple tree cores, and the surfaces of the tree cores to be polished are set upward. The tree core polishing unit is driven to rotate by the second driving unit, and the first driving unit drives the movable bracket to move below the tree core polishing unit.

[0019] Two parallel adjustment brackets form a pair of adjustment bracket groups. Each adjustment bracket includes a linkage rod and multiple height adjustment components. Each height adjustment component is composed of multiple identical adjustment rods hinged end to end, and tension springs are connected to two adjacent adjustment rods.

[0020] The second drive unit is equipped with a signal transmitter, and the slot is equipped with a signal receiver, a coil, and an electromagnetic control unit. The coil is connected to the electromagnetic control unit, and the slot is made of ferromagnetic material. One side of the slot has a spring, and the center of the cylindrical portion of the special-shaped connector has a slot. The slot has a non-circular cross-section, and a spring is sandwiched between the spring and the slot. The drive unit, signal transmitter, signal receiver, and electromagnetic control unit are all connected to the microcontroller.

[0021] In summary, the tree core grinding unit and the tree core grinding device of the present invention have the following advantages compared with the existing tree core grinding devices:

[0022] The core grinding unit and the core grinding device of the present invention can realize semi-automatic or fully automatic control without the need for hand-held operation; there is no danger and no hand injury during precision grinding;

[0023] The core grinding unit uses sandpaper of different grit sizes to grind the core surface to a smoother and finer surface with minimal debris, making it easier to distinguish the shape and size of cells on the core surface under a stereo microscope, and thus more accurately determine the tree ring boundaries.

[0024] The core sanding units with different grit sizes of sandpaper are connected in parallel on the drum rack. The optical signal detection can realize automatic positioning and connection switching, thereby realizing automatic replacement of sandpaper without manual operation.

[0025] The tree core grinding unit and the tree core grinding device of the present invention grind the tree core surface at a relatively low rotation speed and perform low-pressure suction cleaning on the tree core surface, thereby generating a relatively low amount of suspended dust and eliminating the need for a special ventilation and dust removal device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A handheld grinding machine for existing technology;

[0027] Figure 2 A three-dimensional structural diagram of a tree core grinding unit of the present invention;

[0028] Figure 3 A three-dimensional structural diagram of another tree core grinding unit of the present invention;

[0029] Figure 4 A partial cross-sectional view of a tree core grinding unit according to the present invention;

[0030] Figure 5 This is a schematic diagram of the front elevation of the tree core grinding device of the present invention;

[0031] Figure 6 It is a schematic diagram of the right side of the tree core grinding device of the present invention;

[0032] 1-Grinding cylinder; 2-End cap; 3-Slot; 4-Exhaust pipe; 5-Cylinder rack; 6-Cylinder rack bracket; 7-Fixed plate; 8-Moving plate; 9-Rack; 10-Drive unit; 11-Drive unit bracket; 12-Foot pad; 13-Adjustment bracket; 14-Roller; 15-Clamp; 16-Tree core; 17-Strip hole; 18-Center shaft; 19-Bearing 2; 20-Signal transmitting unit; 21-Gear; 22-Horizontal frame;

[0033] 1-1- sandpaper; 1-2- strip groove; 1-3- air inlet; 1-4- cylinder ring; 1-5- counterweight;

[0034] 2-1-end cover; 2-2-bearing 1; 2-3-adapter tube; 2-4-special-shaped connector; 2-5-spring; 2-6-exhaust chamber; 2-7-sealed cabin; 2-8-sealing gasket;

[0035] 3-1-Signal receiving unit; 3-2-Electromagnetic control unit; 3-3-Circlip part;

[0036] 4-1-Impeller; 4-2-Suction pipe;

[0037] 5-1 center wheel; 5-2 support rod;

[0038] 10-1-Drive unit 1; 10-2-Drive unit 2;

[0039] 13-1-linking rod; 13-2-adjusting rod; 13-3-tension spring. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that those skilled in the art will be able to make other improvements or variations without departing from the scope of the present invention, and these improvements or variations are all within the scope of protection of the present invention. Example

[0041] Please inspect Figure 2-Figure 4 , a tree core grinding unit for grinding and cleaning multiple tree core surfaces at the same time, the tree core grinding unit at least comprises a grinding cylinder 1 and an end cover 2, wherein the two ends of the grinding cylinder 1 are connected by end covers 2, the outer periphery of the grinding cylinder 1 is affixed with sandpaper 1-1, and the outer periphery of the grinding cylinder 1 is also provided with a strip groove 1-2, the strip groove 1-2 is located between the outer edges of the two sides of the sandpaper 1-1, and the strip groove 1-2 is provided with an air intake port 1-3; the end cover 2 has an end cover body 2-1, one end of the end cover body 2-1 is connected to the grinding cylinder 1, and the other end is connected to the outer ring of the bearing 2-2, the inner ring of the bearing 2-2 is connected to the adapter cylinder 2-3, the adapter cylinder 2-3 is concentrically arranged with the slot 3 and has a clearance fit, one end of the slot 3 is fixedly connected to one end of the end cover body 2-1, and the other end of the slot 3 is connected to the output shaft of the drive unit 10, the adapter cylinder 2-3 is connected to the exhaust pipe 4, and the exhaust pipe 4 is connected to the air path of the air intake port.

[0042] The air inlets 1-3 can be of orifice type (such as Figure 2 As shown), it can also be a slit type (as shown Figure 3 An air pumping power element is fixedly provided in the slot 3 and rotates coaxially with the slot 3. The air pumping power element is specifically an impeller 4-1.

[0043] Along the radial direction of the grinding barrel 1, from the inside to the outside, a counterweight 1-5, a barrel ring 1-4, and sandpaper 1-1 are arranged in this order. The sandpaper 1-1 is attached to the outer periphery of the barrel ring 1-4, and the counterweight 1-5 is placed in the accommodation space formed by the barrel ring 1-4 and the special-shaped connector 2-4. The special-shaped connector 2-4 has a "mountain" shape in longitudinal cross-section and comprises a columnar portion, a skirt portion, and a flat plate portion that are interconnected. The columnar portion is vertically arranged at the center of the flat plate portion, and the annular skirt portion is vertically arranged at the edge of the flat plate portion. The barrel ring 1-4 is sandwiched between the skirt portion of the special-shaped connector 2-4 and the end cap 2-1.

[0044] When drive unit 10 is activated, the output shaft rotates slot 3, which in turn rotates grinding drum 1. Sandpaper 1-1 on grinding drum 1 can then be used to grind the core of the tree. During the grinding process, impeller 4-1 rotates coaxially with the core grinding unit, creating a negative pressure in sealed chamber 2-7. Air intake 1-3 draws residual wood debris from the surfaces of the multiple cores and discharges it through sealed chamber 2-7 and exhaust pipe 4, thereby cleaning the polished surfaces. After cleaning, a stereo microscope (such as a CCD camera) is used to observe the core surface and identify tree rings. The stereo microscope's identification accuracy must be accurate to the micron level, allowing for clear observation of the cellular morphology on the core surface.

[0045] The adapter tube 2-3 has an exhaust chamber 2-6, and a sealed cabin 2-7 is formed between the flat plate portion of the special-shaped connector 2-4, the bearing 2-2, and the adapter tube 2-3. The sealed cabin 2-7 is connected to the exhaust chamber 2-6 by air. There is an opening on the skirt portion, and the tube ring 1-4 is connected to the intake pipe 4-2, and the intake pipe 4-2 is connected to the intake port by air.

[0046] The clamp 15 is provided with a plurality of tree cores, with the surface of the tree core to be polished facing upwards. The driving unit 10 drives the tree core polishing unit to rotate, pushes the clamp 15 to the bottom of the tree core polishing unit, and polishes the surface of the tree core to be polished. Example

[0047] Different from the first embodiment, the counterweight 1-5 is not provided in this embodiment, the length of the columnar portion of the special-shaped connector 2-4 is long enough, and accordingly, the impeller 4-1 is long enough and is arranged circumferentially along the columnar portion of the special-shaped connector 2-4, and the skirt portion of the special-shaped connector 2-4, the cylinder ring 1-4, and the sandpaper 1-1 are arranged in sequence from the inside to the outside along the radial direction of the grinding cylinder 1.

[0048] In this embodiment, the special-shaped connector 2-4 and the impeller 4-1 itself can serve as a counterweight for the tree core grinding unit, thereby increasing the friction between the sandpaper 1-1 and the surface of the tree core.

[0049] The right end cover 2 of the tree core grinding unit is not provided with a special-shaped connecting piece 2-4 or a slot 3, and the end of the adapter tube 2-3 facing outward is sealed. Example

[0050] Please inspect Figure 5-Figure 6A tree core grinding device includes multiple tree core grinding units as described in the above-mentioned embodiment 1 or embodiment 2, and the sandpaper 1-1 of each tree core grinding unit has a different particle size. The tree core grinding unit is rotatably connected to the support rod 5-2 of the drum rack 5, and multiple support rods 5-2 are arranged in a spoke shape on the center wheel 5-1. The center wheel 5-1 is rotatably connected to the drum rack bracket 6. The tree core grinding unit is driven by the driving unit 10. When grinding, the low-mesh sandpaper 1-1 is first used to grind the surface of the tree core, and then the high-mesh sandpaper 1-1 is used to grind the surface of the tree core.

[0051] A strip hole 17 is provided on the cartridge rack bracket 6 , a center shaft 18 is provided at the center of the center wheel 5 - 1 , and the center shaft 18 is rotatably connected via a second bearing 19 . The second bearing 19 is provided in the strip hole 17 and can move up and down along the strip hole 17 .

[0052] Figure 5 、 Figure 6 The figure shows six core sanding units. Each unit can have a 1-1 sandpaper grit of 240, 400, 600, 800, 1000, or 1500. The higher the grit, the finer the grit of the 1-1 sandpaper. By sanding with sandpaper 1-1 of varying grits, the shape and size of cells on the core surface can be clearly discerned under a stereomicroscope. For extremely narrow, dense tree rings or tree rings that are unclear for other reasons, higher grit sandpaper (800, 1000, or 1500) is used to ensure clear identification of the tree-ring boundaries.

[0053] The driving unit 10 includes a driving unit 10 - 1 and a driving unit 2 10 - 2 . The driving unit 2 10 - 2 is connected via a height-adjustable driving unit bracket 11 . The driving unit 10 may be a servo motor, a hydraulic pump, or the like.

[0054] The tube rack bracket 6 is connected to the tree core pushing unit, and the tree core pushing unit includes at least a fixed plate 7, a movable bracket and an adjustment bracket 13, wherein the tube rack bracket 6 is fixed on the top of the fixed plate 7, and the fixed plate 7 forms a groove-shaped accommodating space along the length direction, and a gear 21 is arranged inside, and the gear 21 is connected to the driving unit 10-1 arranged outside the fixed plate 7.

[0055] The mobile bracket includes two parallel mobile plates 8, which are connected by a cross frame 22. A rack 9 is provided on the outside of one mobile plate 8, and the rack 9 is meshed with an internal gear 21. In order to reduce friction, a plurality of rollers 14 are also provided at the bottom of the mobile bracket.

[0056] The fixed plate 7 and the bottom of the movable bracket are further provided with feet 12. For the movable bracket, the rollers 14 can be provided on the feet 12 at the bottom thereof.

[0057] The top of the movable bracket is hinged to the bottom of the adjustable bracket 13, which is hinged to the top of the adjustable bracket 13. The clamp 15 holds multiple tree cores, with the surfaces to be polished facing upward. The core polishing unit is driven by drive unit 2 10-2. Drive unit 1 10-1 drives gear 21 to engage with rack 9, thereby driving the movable bracket downward to polish the surfaces of multiple tree cores 16 using sandpaper 1-1.

[0058] Two parallel adjustment brackets 13 form a pair of adjustment brackets. Each adjustment bracket 13 includes a linkage rod 13-1 and two height adjustment assemblies. Each height adjustment assembly is composed of four identical adjustment rods 13-2 hinged end-to-end. Tension springs 13-3 are installed within the height adjustment assembly and connected to two adjacent adjustment rods 13-2. During the movement of the movable bracket, the adjustment bracket 13 drives the clamp 15 to adjust its height. The air intake 1-3 closely aligns with the surface of the core to be polished, thereby effectively absorbing wood debris remaining on the surface of the core 16.

[0059] The signal transmitter 20 is mounted on the second drive unit 10-2. Correspondingly, a signal receiver 3-1 is mounted within the slot 3. Slot 3 also houses a coil and an electromagnetic control unit 3-2, which are connected to the electromagnetic control unit 3-2. Slot 3 is made of ferromagnetic material. A spring 3-3 with a T-shaped longitudinal cross-section is formed on one side of the slot 3. The coil is wound around the spring 3-3. The center of the columnar portion of the special-shaped connector 2-4 has a slot with a non-circular cross-section. A spring 2-5 is sandwiched between the spring 3-3 and the slot. The drive unit 10, signal transmitter 20, signal receiver 3-1, and electromagnetic control unit 3-2 are all connected to a microcontroller (MCU).

[0060] As the barrel holder 5 rotates, the signal transmitting unit 20 continuously emits a light signal. When the signal receiving unit 3-1 detects the light signal, it sends an electromagnetic attraction command to the micro-control unit. The electromagnetic control unit 3-2 controls the coil to energize, generating an induced current in the coil, which in turn generates a magnetic attraction force in the slot 3. Because the output shaft of the second drive unit 10-2 is made of ferromagnetic material, the slot 3 extends from the adapter barrel 2-3 and connects to the output shaft of the second drive unit 10-2. The micro-control unit sends a start command to the second drive unit 10-2, which drives the core grinding unit 10-2 to grind. After the preset grinding time, the micro-control unit sends an electromagnetic de-attachment command, and the electromagnetic control unit 3-2 controls the coil to de-energize, causing the slot 3 to retract under the action of the spring force.

[0061] In summary, the core grinding unit and core grinding device applied for by the present invention are semi-automatic or fully automatic in control compared with the existing core annual ring grinding devices. The sandpaper rotates coaxially with the impeller for air extraction and is driven by the same drive unit, integrating grinding and chip removal. The system is greatly simplified and does not need to be held hand-held, so there is no danger and no hand injury during precision grinding. By grinding with sandpaper of different particle sizes, the surface of the core will be polished smoother and more delicate, making it easier to distinguish the shape and size of the cells on the surface of the wood core more clearly under a stereo microscope, and thus more accurately determine the tree ring boundaries. It can enable the sandpaper of the current core grinding unit to maintain sufficient roughness, improve material utilization, and improve the efficiency of core grinding.

[0062] Those skilled in the art should understand that the above embodiments only describe the optimal implementation scheme of the present invention and are not limited to the above technical scheme. Without departing from the basic concept of the present invention, other technical schemes are formed by any combination of the above technical features or their equivalent features, such as the technical scheme formed by replacing the above technical features with technical features with similar functions invented in the present invention. The scope of protection of the present invention is determined by the technical scheme covered by the claims.

Claims

1. A tree core grinding unit for simultaneously grinding and cleaning multiple tree core surfaces, characterized by: The tree core grinding unit comprises at least a grinding cylinder and an end cap, wherein the two ends of the grinding cylinder are connected by the end cap, the outer circumference of the grinding cylinder is affixed with sandpaper, and the outer circumference of the grinding cylinder is further provided with a strip groove, the strip groove is located between the outer edges of the two sides of the sandpaper, and the strip groove has an air intake; The end cover comprises an end cover body, one end of the end cover body is connected to the grinding cylinder, and the other end is connected to an outer ring of the bearing, an inner ring of the bearing is connected to an adapter cylinder, the adapter cylinder is concentrically arranged with the slot, one end of the slot is fixedly connected to one end of the end cover body, the other end of the slot is electromagnetically adsorbed and connected to the output shaft of the drive unit, the adapter cylinder is connected to the exhaust pipe, and the exhaust pipe is in communication with the air path of the air intake; after a preset grinding time, the slot is controlled to be electromagnetically decoupled from the output shaft of the drive unit; The slot is movably connected to a special-shaped connecting piece, the slot and the special-shaped connecting piece rotate coaxially, and the special-shaped connecting piece is fixedly connected to the impeller.

2. A tree core grinding unit according to claim 1, characterized in that: A counterweight, a barrel ring, and sandpaper are sequentially arranged along the radial direction of the grinding barrel from inside to outside, wherein the sandpaper is attached to the outer periphery of the barrel ring, and the counterweight is arranged in an accommodating space formed by the barrel ring and the special-shaped connecting piece.

3. The tree core grinding unit according to claim 1, characterized in that: A skirt portion, a barrel ring, and sandpaper are sequentially arranged along the radial direction of the grinding barrel from inside to outside, wherein the sandpaper is attached to the outer periphery of the barrel ring, and the barrel ring is attached to the outer periphery of the skirt portion.

4. The tree core grinding unit according to claim 1, characterized in that: The longitudinal section of the special-shaped connecting piece is in the shape of a "mountain", and the special-shaped connecting piece has a columnar portion, a skirt portion and an annular flat plate portion that are connected to each other, wherein the columnar portion is vertically arranged at the center of the flat plate portion, the skirt portion is vertically arranged at the edge of the flat plate portion, and a cylindrical ring is sandwiched between the skirt portion and the end cover body.

5. The tree core grinding unit according to claim 3, characterized in that: The adapter tube has an exhaust cavity, and a sealed cabin is formed between the flat plate portion of the special-shaped connector, the bearing 1, and the adapter tube. The sealed cabin is connected to the exhaust cavity air path. The skirt portion has an opening, and an intake pipe is connected to the tube ring, and the intake pipe is connected to the intake port air path.

6. The tree core grinding unit according to claim 1, characterized in that: A plurality of tree core clamps are arranged in the clamp. When the driving unit drives the tree core grinding unit to rotate, the clamp is pushed to the bottom of the tree core grinding unit to grind the surface of the tree core.

7. A tree core grinding device, comprising the tree core grinding unit as claimed in claim 1, wherein there are multiple tree core grinding units, and the sandpaper particle size of each tree core grinding unit is different. The tree core grinding unit is rotatably connected to the support rod of the drum rack, and multiple support rods are arranged on the center wheel, and the center wheel is rotatably connected to the drum rack bracket. The tree core grinding unit is driven by a driving unit. During grinding, the surface of the tree core is first ground with low-mesh sandpaper, and then the surface of the tree core is ground with high-mesh sandpaper.

8. The tree core grinding device according to claim 7, characterized in that: The driving unit includes driving unit 1 and driving unit 2, and the driving unit 2 is connected through a height-adjustable driving unit bracket; the drum rack bracket is connected to the tree core pushing unit, and the tree core pushing unit includes at least a fixed plate, a movable bracket and an adjustment bracket. The drum rack bracket is fixed on the top of the fixed plate, and the fixed plate is formed with a groove-shaped accommodating space along the length direction. A gear is arranged inside the accommodating space, and the gear is connected to the driving unit 1 arranged outside the fixed plate; the movable bracket includes two movable plates parallel to each other, and the two movable plates are connected by a horizontal frame. A rack is arranged on the outside of one movable plate, and the rack is engaged with the gear.

9. The tree core grinding device according to claim 7, characterized in that: A signal transmitting unit is provided on the second driving unit, and a signal receiving unit, a coil and an electromagnetic control unit are provided in the slot, the coil is connected to the electromagnetic control unit, and the slot is made of ferromagnetic material; a retaining spring portion is provided on one side of the slot, and a slot is provided in the middle of the columnar portion of the special-shaped connecting piece, the cross-section of the slot is non-circular, a spring is sandwiched between the retaining spring portion and the slot, and the driving unit, signal transmitting unit, signal receiving unit and electromagnetic control unit are all connected to the micro-control unit.

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