Cylindrical wood polishing device with adjusting mechanism

Abstract

The invention relates to the technical field of wood grinding and polishing, in particular to a cylindrical wood grinding device with an adjusting mechanism, which comprises a first positioning rod, the periphery of the first positioning rod is movably sleeved with an air blowing cylinder in the vertical direction, and an annular gap is formed between the air blowing cylinder and the first positioning rod; an annular fan is rotatably arranged in the annular gap around the axis of the first positioning rod, air flow from top to bottom in the vertical direction is generated when the annular fan is started, the air flow is exhausted from the lower end of the annular gap, two detection rods are symmetrically and fixedly arranged on the air blowing barrel, and detection balls are rotatably arranged at the ends, away from the air blowing barrel, of the detection rods; when the end of the first positioning rod makes contact with the surface of the wood, the two detection balls are arranged in the length direction of the wood, and at least one detection ball makes contact with the surface of the wood. According to the invention, the detection precision of the first positioning rod is improved, and at the same time, the blowing cylinder is prevented from scraping the surface of wood when discharging airflow.

Description

Technical Field

[0001] The present invention relates to the technical field of wood grinding and polishing, and specifically relates to a cylindrical wood grinding device with an adjustment mechanism. Background Art

[0002] Existing wood grinding and polishing devices generate friction between the wood and the grinding disc through the rotation of the grinding disc and the rotation of the wood itself to grind and polish the wood surface. However, this form of grinding and polishing cannot adjust the rotation speed of the grinding disc in a timely manner when dealing with variable-diameter wood. Moreover, different woods have different diameters. If the rotation speed of the grinding disc cannot be adjusted in a timely manner during the grinding process, the grinding speed at the variable-diameter part of the wood will be the same as that at other positions, while the circumferential areas of the variable-diameter part and other positions of the wood are not the same. This will result in different grinding forces per unit grinding area for different diameter segments of the wood, leading to excessive grinding at the smaller-diameter part of the wood or insufficient force at the larger-diameter part.

[0003] Chinese Patent Publication No. CN118254046B discloses a grinding and polishing device for cylindrical wood processing, including a workbench. A motor is fixedly connected to the upper side of the workbench. The output shaft of the motor is fixedly connected to a spline shaft. A grinding disc is spline-connected to the spline shaft of the motor. A rotating ring is rotatably connected to the grinding disc. A sliding frame is fixedly connected to the rotating ring. An electromagnetic slider fixedly connected to the sliding frame is slidably connected to the upper side of the workbench through an electric slide rail. The sliding frame is slidably connected to symmetrically distributed trigger frames through a chute. Symmetrically distributed trigger blocks are slidably connected between the symmetrically distributed trigger frames. A positioning rod is fixedly connected to the side of the trigger block close to the grinding disc. A bidirectional telescopic rod is fixedly connected to the side of the trigger frame close to the symmetrically distributed positioning rods. The telescopic end of the bidirectional telescopic rod is fixedly connected to the adjacent positioning rod. A first pneumatic telescopic rod is fixedly connected between the symmetrically distributed trigger frames. A second pneumatic telescopic rod communicated with the adjacent first pneumatic telescopic rod through a conduit is fixedly connected to the workbench. A sliding rheostat is fixedly connected to the workbench at a position close to the second pneumatic telescopic rod. The telescopic end of the second pneumatic telescopic rod is fixedly connected to the sliding piece on the sliding rheostat. The motor is electrically connected to the sliding rheostat. A fixing component for positioning the wood is arranged on the workbench.

[0004] The above solution enables the grinding disc to achieve adaptive adjustment when grinding wood. However, it requires the straight-line distance between the ends of the two positioning rods as a reference value, that is, the diameter of the wood being ground is monitored in real time through the two positioning rods, so that the grinding disc can perform adaptive adjustment according to the monitoring results. However, when the two positioning rods are positioning the wood, the grinding disc is in a grinding state, and the flying wood chips will fall on the contact position between the positioning rod and the wood, resulting in deviation when the positioning rod monitors the diameter of the wood in real time. At the same time, the positioning rod is in frictional cooperation with the wood during positioning, which is likely to form scratches on the surface of the wood. Summary of the Invention

[0005] In view of the above problems, a cylindrical wood grinding device with an adjustment mechanism is provided. A blowing cylinder is movably sleeved around the first positioning rod in the vertical direction, and an annular fan is arranged in the blowing cylinder. When the annular fan operates, an air flow is generated from top to bottom in the vertical direction. At the same time, detection rods are respectively arranged on the two side walls of the blowing cylinder, and detection balls are rotatably arranged at the ends of the detection rods. During grinding, the undulation condition of the wood surface is pre-judged through the detection balls.

[0006] To solve the problems of the prior art, the present invention provides a cylindrical wood grinding device with an adjustment mechanism, including a grinding disc for grinding wood and a diameter measuring unit. The diameter measuring unit includes a first positioning rod and a second positioning rod arranged vertically from top to bottom. The wood passes horizontally between the first positioning rod and the second positioning rod. A blowing cylinder is movably sleeved around the first positioning rod in the vertical direction, and there is an annular gap between the blowing cylinder and the first positioning rod. An annular fan is rotatably arranged around the axis of the first positioning rod in the annular gap. When the annular fan is started, an air flow is generated from top to bottom in the vertical direction, and the air flow is discharged from the lower end of the annular gap. Two detection rods are symmetrically and fixedly arranged on the blowing cylinder, and detection balls are rotatably arranged at the ends of the detection rods far away from the blowing cylinder. When the end of the first positioning rod contacts the wood surface, the two detection balls are arranged along the length direction of the wood, and at least one detection ball contacts the wood surface.

[0007] Preferably, an annular magnetic drive for driving the annular fan to rotate is arranged on the inner wall of the blowing cylinder. When the blowing cylinder rises relative to the first positioning rod, the power of the annular magnetic drive increases. When the blowing cylinder descends relative to the first positioning rod, the power of the annular magnetic drive decreases.

[0008] Preferably, a rolling ball is rotatably arranged at the lower end of the first positioning rod. When the first positioning rod and the second positioning rod detect the diameter of the wood, the rolling ball is in rolling cooperation with the wood surface.

[0009] Preferably, a sliding piece electrically connected to the annular magnetic driver is fixedly arranged on the inner wall of the hair dryer. A resistance column is fixedly arranged on one side of the first positioning rod. A terminal is arranged at the upper end of the resistance column. The sliding piece is in sliding fit with the resistance column.

[0010] Preferably, a scraper is rotatably arranged around the axis of the first positioning rod at the bottom of the first positioning rod. The scraper is in sliding fit with the lower end of the first positioning rod. A transmission unit is arranged between the annular fan and the scraper. When the annular fan rotates, the scraper is driven to rotate through the transmission unit.

[0011] Preferably, a first extension sleeve is fixedly arranged along the axis of the first positioning rod above the annular fan. A second extension sleeve with the lower end fixedly connected to the scraper is rotatably arranged along the axis of the first positioning rod on one side of the inner ring of the first extension sleeve. The second extension sleeve sequentially passes through the inner ring of the annular fan and the first extension sleeve from top to bottom. A speed reduction unit is arranged between the first extension sleeve and the second extension sleeve.

[0012] Preferably, the speed reduction unit includes a first rotating wheel rotatably arranged on one side of the first extension sleeve. A first rotating belt in transmission fit with both of them is sleeved on the first rotating wheel and the first extension sleeve. A second rotating wheel is fixedly arranged at the end of the first rotating wheel. A second rotating belt in transmission fit with both of them is sleeved on the second rotating wheel and the second extension sleeve. The diameter of the second rotating wheel is smaller than the diameter of the second extension sleeve.

[0013] Preferably, an air inlet pipe for supplying air into the hair dryer is arranged above the hair dryer. The end of the air inlet pipe far away from the hair dryer is arranged on the side of the grinding disc far away from the wood.

[0014] Preferably, a limiting plate is fixedly arranged on the upper part of the hair dryer. When the hair dryer is in the lowest position, the limiting plate contacts the upper end of the first positioning rod.

[0015] Preferably, the outer surface of the rolling ball is coated with an anti-static coating.

[0016] The beneficial effects of the present invention compared with the prior art are as follows: 1. In the present invention, a hair dryer is movably sleeved along the vertical direction around the first positioning rod, and an annular fan is arranged in the hair dryer. When the annular fan operates, an air flow from top to bottom in the vertical direction is generated. At the same time, detection rods are respectively arranged on the two side walls of the hair dryer. Detection balls are rotatably arranged at the ends of the detection rods. During grinding, the undulation condition of the wood surface is pre-judged through the detection balls, which not only ensures that when the first positioning rod detects the wood surface, the flying sawdust from the outside will not affect the detection result of the first positioning rod, but also enables the hair dryer to rise and fall automatically according to the undulation of the wood surface in real time, avoiding the hair dryer from scraping against the wood surface when discharging the air flow.

[0017] 2. By providing a ring-shaped magnetic drive on the inner wall of the hair dryer for driving the ring-shaped fan to rotate, when the hair dryer rises relative to the first positioning rod, the power of the ring-shaped magnetic drive increases; when the hair dryer descends relative to the first positioning rod, the power of the ring-shaped magnetic drive decreases. This not only ensures that the hair dryer will not scratch the surface of the wood during the grinding process but also ensures that when the hair dryer rises, the wind force generated by the ring-shaped fan is greater, thus ensuring that the air flow velocity around the lower end of the first positioning rod will not slow down due to the rise of the hair dryer.

[0018] 3. By fixedly installing a sliding piece on the inner wall of the hair dryer and electrically connecting the sliding piece to the ring-shaped magnetic drive, when the hair dryer rises due to the change in the diameter of the wood, the lower end of the hair dryer rises, and the hair dryer drives the sliding piece to rise synchronously. At this time, the sliding piece moves towards the terminal. The resistance column between the sliding piece and the terminal is the actual resistance. The closer the sliding piece is to the terminal, the smaller the actual resistance. Conversely, when the sliding piece descends with the hair dryer, the distance between the sliding piece and the terminal becomes larger, and the actual resistance also gradually increases. When the resistance is smaller, the current transmitted to the ring-shaped magnetic drive through the resistance column under the same voltage is also larger. In this way, the power of the ring-shaped magnetic drive rises, ensuring that the power of the ring-shaped magnetic drive can be adjusted synchronously with the rise and fall of the hair dryer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional schematic diagram of a cylindrical wood grinding device with an adjustment mechanism according to the present invention Figure 1 .

[0020] Figure 2 is a three-dimensional schematic diagram of a cylindrical wood grinding device with an adjustment mechanism according to the present invention Figure 2 .

[0021] Figure 3 is a Figure 2 partial enlarged schematic view of part A in a cylindrical wood grinding device with an adjustment mechanism according to the present invention.

[0022] Figure 4 is a side view of a cylindrical wood grinding device with an adjustment mechanism according to the present invention.

[0023] Figure 5 is a Figure 4 cross-sectional schematic view taken along line B - B in a cylindrical wood grinding device with an adjustment mechanism according to the present invention.

[0024] Figure 6 is a Figure 5 partial enlarged schematic view of part C in a cylindrical wood grinding device with an adjustment mechanism according to the present invention.

[0025] Figure 7 is a sectional three-dimensional schematic diagram of a cylindrical wood grinding device with an adjustment mechanism according to the present invention.

[0026] Figure 8 is the partial enlarged schematic view of the position D in a cylindrical wood grinding device with an adjusting mechanism according to the present invention Figure 7 in the figure.

[0027] Figure 9 is the partial enlarged schematic view of the position E in a cylindrical wood grinding device with an adjusting mechanism according to the present invention Figure 7 in the figure.

[0028] Figure 10 is the three-dimensional schematic view of the diameter measuring unit of a cylindrical wood grinding device with an adjusting mechanism according to the present invention after removing the air blower

[0029] Figure 11 is the three-dimensional schematic view of the diameter measuring unit of a cylindrical wood grinding device with an adjusting mechanism according to the present invention after removing the annular magnetic drive and the air blower Figure 1 .

[0030] Figure 12 is the three-dimensional schematic view of the diameter measuring unit of a cylindrical wood grinding device with an adjusting mechanism according to the present invention after removing the annular magnetic drive and the air blower Figure 2 .

[0031] The reference numerals in the figure are as follows: 1, grinding disc; 2, diameter measuring unit; 21, first positioning rod; 211, rolling ball; 212, scraping plate; 213, transmission unit; 2131, first extension sleeve; 2132, second extension sleeve; 2133, first rotating wheel; 2134, first rotating belt; 2135, second rotating wheel; 2136, second rotating belt; 22, second positioning rod; 23, air blower; 231, detecting rod; 232, detecting ball; 233, resistance column; 234, terminal; 235, sliding piece; 236, air inlet pipe; 237, limiting plate; 24, annular fan; 25, distance measuring instrument; 26, annular magnetic drive; 3, wood. Specific embodiments

[0032] In order to further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Refer to Figures 1 - 6: A cylindrical wood grinding device with an adjustment mechanism, comprising a grinding disc 1 for grinding wood 3 and a diameter measuring unit 2. The diameter measuring unit 2 includes a first positioning rod 21 and a second positioning rod 22 arranged vertically from top to bottom. Wood 3 passes horizontally between the first positioning rod 21 and the second positioning rod 22. A blowing cylinder 23 is movably sleeved around the first positioning rod 21 in the vertical direction. There is an annular gap between the blowing cylinder 23 and the first positioning rod 21. An annular fan 24 is rotatably arranged around the axis of the first positioning rod 21 in the annular gap. When the annular fan 24 is started, an air flow is generated from top to bottom in the vertical direction, and the air flow is discharged from the lower end of the annular gap. Two detection rods 231 are symmetrically and fixedly arranged on the blowing cylinder 23. A detection ball 232 is rotatably arranged at the end of the detection rod 231 away from the blowing cylinder 23. When the end of the first positioning rod 21 contacts the surface of the wood 3, the two detection balls 232 are arranged along the length direction of the wood 3, and at least one detection ball 232 contacts the surface of the wood 3.

[0034] A machine tool for receiving the grinding disc 1 is arranged below the grinding disc 1. The machine tool is provided with a clamp for clamping and fixing one end of the wood 3 and a tailstock arranged at the other end of the wood 3. When grinding the existing cylindrical wood 3, the wood 3 is first horizontally placed on the machine tool. One end of the wood 3 is clamped by the clamp and the other end of the wood 3 is supported by the tailstock, ensuring the stability of the wood 3 during rotation. According to the processing requirements, the diameter of some wood 3 needs to change during processing, that is, in the length direction of the wood 3, the diameter of the wood 3 is not always constant. In order to improve the processing accuracy, in the process of grinding the wood 3 by the existing wood grinding device, a first positioning rod 21 and a second positioning rod 22 are respectively arranged above and below the wood 3. The first positioning rod 21 and the second positioning rod 22 are arranged vertically. The wood 3 passes between the first positioning rod 21 and the second positioning rod 22. Before processing, the end of the first positioning rod 21 and the end of the second positioning rod 22 are made to contact the wood 3, thereby realizing the real-time measurement of the diameter of the wood 3. However, during the grinding process of the grinding disc 1 on the wood 3, the wood chips ground by the grinding disc 1 will fly everywhere, and the landing points of the flying wood chips are uncontrollable. If the wood chips fall on the upper part of the wood 3, when the grinding disc 1 and the diameter measuring unit 2 move synchronously, when the first positioning rod 21 above the wood 3 passes through the surface of the wood 3 with wood chips attached, the first positioning rod 21 is easily affected by the wood chips, resulting in the measured diameter of the wood 3 by the first positioning rod 21 and the second positioning rod 22 being greater than the actual diameter of the wood 3.

[0035] To avoid the above situation, the structure of the existing diameter measuring unit 2 is redesigned so that the wood chips during the grinding process will not splash to the contact position between the first positioning rod 21 and the wood 3, improving the detection accuracy of the diameters of the wood 3 by the first positioning rod 21 and the second positioning rod 22. The specific structure and working process of the diameter measuring unit 2 in the present invention are as follows: Before grinding, the first positioning rod 21 and the second positioning rod 22 are first attached to the wood 3. The first positioning rod 21 and the second positioning rod 22 have a squeezing force on the wood 3 during the grinding process, but the squeezing force should not be too large, otherwise the first positioning rod 21 and the second positioning rod 22 are likely to squeeze and deform the surface of the wood 3. When the diameter of the wood 3 being ground starts to change, the distance between the first positioning rod 21 and the second positioning rod 22 also changes. During the grinding process, the flying wood chips are mainly likely to splash to the upper part of the wood 3, resulting in the first positioning rod 21 not being able to stably contact the surface of the wood 3, while the second positioning rod 22 located below the wood 3 is usually not easily affected by the flying wood chips. When the grinding disc 1 grinds the wood 3, the annular fan 24 in the air blower tube 23 sleeved around the first positioning rod 21 is started. The annular fan 24 generates an air flow flowing vertically downward from top to bottom in the annular gap. The air flow is discharged from the lower end of the annular gap, and the discharged air flow forms an isolation circle around the lower end of the first positioning rod 21. When the external flying wood chips approach the lower end of the first positioning rod 21, the air discharged from the annular gap can blow the wood chips away. At the same time, the wood chips falling on the upper part of the wood 3 will also be blown away by the air flow blown out from the annular gap. Since the wood 3 to be processed by the grinding device in the present invention has a variable diameter, if the air blower tube 23 sleeved around the first positioning rod 21 cannot slide along the extension direction of the first positioning rod 21, the situation where the lower end of the air blower tube 23 abuts against the surface of the wood 3 will occur, thereby causing the air blower tube 23 to scratch the surface of the wood 3. To avoid the above situation, two detection rods 231 are provided on the side wall of the air blower tube 23, and detection balls 232 are rotatably provided at the ends of the detection rods 231. The two detection balls 232 are respectively located on both sides of the first positioning rod 21, and when the first positioning rod 21 detects the wood 3, the arrangement direction of the two detection balls 232 is parallel to the extension direction of the wood 3. During the grinding process, when the diameter of the wood 3 changes, the two detection balls 232 provided on both sides of the first positioning rod 21 can detect the change in the diameter of the wood 3 in advance. The detection balls 232 drive the air blower tube 23 to rise and fall according to the undulation of the surface of the wood 3, avoiding the lower end of the air blower tube 23 from scratching the surface of the wood 3. A distance measuring instrument 25 for measuring the change in the distance between the first positioning rod 21 and the second positioning rod 22 is provided on the upper part of the first positioning rod 21. The lengths of the first positioning rod 21 and the second positioning rod 22 are constant, so as to measure the actual diameter of the wood 3.

[0036] A hair dryer 23 is sleeved around the outer periphery of the first positioning rod 21 and moves vertically. An annular fan 24 is arranged inside the hair dryer 23. When the annular fan 24 operates, an air flow is generated from top to bottom in the vertical direction. At the same time, detection rods 231 are respectively arranged on the two side walls of the hair dryer 23. A detection ball 232 is rotatably arranged at the end of the detection rod 231. During grinding, the undulation condition of the surface of the wood 3 is pre-judged through the detection ball 232. This not only ensures that when the first positioning rod 21 detects the surface of the wood 3, flying wood chips from the outside will not affect the detection result of the first positioning rod 21, but also the hair dryer 23 can rise and fall automatically according to the undulation of the surface of the wood 3 in real time, avoiding scratching the surface of the wood 3 when the hair dryer 23 discharges the air flow.

[0037] Refer to Figure 6 : An annular magnetic drive 26 for driving the annular fan 24 to rotate is arranged on the inner wall of the hair dryer 23. When the hair dryer 23 rises relative to the first positioning rod 21, the power of the annular magnetic drive 26 increases. When the hair dryer 23 descends relative to the first positioning rod 21, the power of the annular magnetic drive 26 decreases.

[0038] Since the diameter of the wood 3 may change according to the processing requirements during the grinding process, the grinding disc 1 and the diameter measuring unit 2 move synchronously along the extension direction of the wood 3 during the grinding operation. The hair dryer 23 sleeved around the outer periphery of the first positioning rod 21 contacts the wood 3 through the detection ball 232, so that the detection ball 232 can detect the change in the diameter of the wood 3 earlier than the first positioning rod 21. When the hair dryer 23 rises relative to the first positioning rod 21, the distance from the lower end of the hair dryer 23 to the wood 3 is shorter. If the annular magnetic drive 26 drives the annular fan 24 to rotate at a constant power at this time, the air flow velocity around the end of the first positioning rod 21 close to the wood 3 will decrease, and it is easy for flying wood chips to fall on the wood 3 below the first positioning rod 21, resulting in errors when the first positioning rod 21 and the second positioning rod 22 detect the diameter of the wood 3. By increasing the power of the annular magnetic drive 26 when the hair dryer 23 rises and decreasing the power when the hair dryer 23 descends, it is avoided that the wood chips during grinding fall on the wood 3 directly below the first positioning rod 21 when the hair dryer 23 rises. It should be noted that the air flow velocity around the first positioning rod 21 should be controlled at 15 - 25 m / s. If the air flow velocity is too large, the wood chips falling on the grinding device will be blown up again by the air flow. If the air flow velocity is too small, the wood chips will fall on the wood 3 directly below the first positioning rod 21.

[0039] Refer to Figure 9 : A rolling ball 211 is rotatably arranged at the lower end of the first positioning rod 21. When the first positioning rod 21 and the second positioning rod 22 detect the diameter of the wood 3, the rolling ball 211 rolls in cooperation with the surface of the wood 3.

[0040] The friction when the first positioning rod 21 contacts the surface of the wood 3 is reduced, avoiding abrasion of the surface of the wood 3 when the first positioning rod 21 detects the wood 3.

[0041] Refer to Figure 8 : A sliding piece 235 electrically connected to the annular magnetic drive 26 is fixedly arranged on the inner wall of the hair dryer 23. A resistance column 233 is fixedly arranged on one side of the first positioning rod 21. A terminal 234 is arranged at the upper end of the resistance column 233. The sliding piece 235 is in sliding fit with the resistance column 233.

[0042] By fixedly arranging the sliding piece 235 on the inner wall of the hair dryer 23 and making the sliding piece 235 electrically connected to the annular magnetic drive 26, when the hair dryer 23 rises due to the change in diameter of the wood 3, the lower end of the hair dryer 23 rises, and the hair dryer 23 drives the sliding piece 235 to rise synchronously. At this time, the sliding piece 235 moves towards the terminal 234. The resistance column 233 between the sliding piece 235 and the terminal 234 is the actual resistance. The closer the sliding piece 235 is to the terminal 234, the smaller the actual resistance. On the contrary, when the sliding piece 235 descends with the hair dryer 23, the distance between the sliding piece 235 and the terminal 234 becomes larger, and the actual resistance also gradually becomes larger. When the resistance is smaller, the current transmitted to the annular magnetic drive 26 through the resistance column 233 under the same voltage is also larger. In this way, the power of the annular magnetic drive 26 rises, ensuring that the power of the annular magnetic drive 26 can be adjusted synchronously with the lifting and lowering of the hair dryer 23.

[0043] Refer to Figure 8 、 Figure 10 and Figure 11 : A scraper 212 is rotatably arranged around the axis of the first positioning rod 21 at the bottom of the first positioning rod 21. The scraper 212 is in sliding fit with the lower end of the first positioning rod 21. A transmission unit 213 is arranged between the annular fan 24 and the scraper 212. When the annular fan 24 rotates, the scraper 212 is driven to rotate through the transmission unit 213.

[0044] The rolling ball 211 arranged at the lower end of the first positioning rod 21 will adhere to fine wood chips and dust during the rolling process. The rolling ball 211 drives the wood chips and dust to the lower end of the first positioning rod 21 for scraping. After long-term use, a relatively large amount of wood chips and dust will adhere to the lower end of the first positioning rod 21. In order to avoid excessive adhesion of wood chips and dust to the lower end of the first positioning rod 21, the scraper 212 and the transmission unit 213 are arranged. When the annular fan 24 is started, the annular fan 24 drives the scraper 212 to rotate around the first positioning rod 21 through the transmission unit 213. The scraper 212 scrapes off the wood chips and dust adhering to the lower end of the first positioning rod 21. The scraped wood chips and dust gather into a ball, and the hair dryer 23 blows off the formed ball of wood chips and dust.

[0045] Refer toFigure 9 : A first extension sleeve 2131 is fixedly arranged along the axis of the first positioning rod 21 at the upper part of the annular fan 24. A second extension sleeve 2132, whose lower end is fixedly connected to the scraper 212, is rotatably arranged along the axis direction of the first positioning rod 21 on one side of the inner ring of the first extension sleeve 2131. The second extension sleeve 2132 sequentially passes through the inner ring of the annular fan 24 and the first extension sleeve 2131 from top to bottom. A speed reduction unit is arranged between the first extension sleeve 2131 and the second extension sleeve 2132.

[0046] Since the rotation speed of the annular fan 24 is relatively fast, by setting the speed reduction unit, the rotation speed of the scraper 212 is reduced, thereby reducing the wear between the scraper 212 and the lower end of the first positioning rod 21.

[0047] Refer to Figure 11 and Figure 12 : The speed reduction unit includes a first rotating wheel 2133 rotatably arranged on one side of the first extension sleeve 2131. A first rotating belt 2134, which is in transmission cooperation with both of them, is sleeved on the first rotating wheel 2133 and the first extension sleeve 2131. A second rotating wheel 2135 is fixedly arranged at the end of the first rotating wheel 2133. A second rotating belt 2136, which is in transmission cooperation with both of them, is sleeved on the second rotating wheel 2135 and the second extension sleeve 2132. The diameter of the second rotating wheel 2135 is smaller than the diameter of the second extension sleeve 2132.

[0048] The diameter of the first rotating wheel 2133 is greater than or equal to the diameter of the first extension sleeve 2131, thereby achieving the effect of reducing the speed of the scraper 212.

[0049] Refer to Figure 3 and Figure 4 : An air inlet pipe 236 for supplying air into the air blowing cylinder 23 is arranged above the air blowing cylinder 23. One end of the air inlet pipe 236 far from the air blowing cylinder 23 is arranged on the side of the grinding disc 1 far from the wood 3.

[0050] By arranging one end of the air inlet pipe 236 far from the air blowing cylinder 23 on the side of the grinding disc 1 far from the wood 3, it is ensured that when the air inlet pipe 236 sucks in the outside air, the content of wood chips in the sucked air is less. This not only avoids that the air flow discharged through the air blowing cylinder 23 contains more wood chips, but also avoids the air inlet pipe 236 being blocked by wood chips.

[0051] Refer to Figure 8 : A limiting plate 237 is fixedly arranged at the upper part of the air blowing cylinder 23. When the air blowing cylinder 23 is in the lowest position, the limiting plate 237 contacts the upper end of the first positioning rod 21.

[0052] By setting the limit plate 237, the upper end of the first positioning rod 21 supports the limit plate 237. At this time, the lower end surface of the hair dryer 23 is higher than the lower end surface of the first positioning rod 21. When a bulge appears on the surface of the wood 3, and the two detection balls are located on both sides of the bulge, the hair dryer 23 will not bottom out.

[0053] Reference Figures 1 - 12 : The outer surface of the ball 211 is coated with an antistatic coating.

[0054] By coating the outer surface of the rolling ball 211 with an antistatic coating, the rolling ball 211 is less likely to absorb wood chips and dust when rolling on the wood 3 .

[0055] Working principle: Before grinding, the first positioning rod 21 and the second positioning rod 22 are first attached to the wood 3. The first positioning rod 21 and the second positioning rod 22 exert a squeezing force on the wood 3 during grinding, but the squeezing force should not be too large, otherwise the first positioning rod 21 and the second positioning rod 22 are likely to squeeze and deform the surface of the wood 3. When the wood 3 being grinded begins to change in diameter, the distance between the first positioning rod 21 and the second positioning rod 22 also changes. During grinding, the flying wood chips are likely to mainly splash onto the upper part of the wood 3, causing the first positioning rod 21 to be unable to stably contact the surface of the wood 3, while the second positioning rod 22 located below the wood 3 is usually not easily affected by the flying wood chips. When the sanding disc 1 is sanding the wood 3, the annular fan 24 in the blower tube 23 sleeved on the outer periphery of the first positioning rod 21 is started, and the annular fan 24 generates an airflow flowing from top to bottom in the vertical direction in the annular gap, and the airflow is discharged from the lower end of the annular gap. The discharged airflow forms an isolation circle around the lower end of the first positioning rod 21. When wood chips flying from the outside are close to the lower end of the first positioning rod 21, the air discharged from the annular gap can blow the wood chips away, and at the same time, the wood chips falling on the upper part of the wood 3 will also be blown away by the airflow blown out from the annular gap. Since the wood 3 to be processed by the grinding device of the present invention has a variable diameter, if the hair dryer 23 sleeved on the outer periphery of the first positioning rod 21 cannot slide along the extension direction of the first positioning rod 21, the lower end of the hair dryer 23 will abut against the surface of the wood 3, thereby causing the hair dryer 23 to scratch the surface of the wood 3. In order to avoid the above situation, two detection rods 231 are arranged on the side wall of the hair dryer 23, and a detection ball 232 is rotatably arranged at the end of the detection rod 231. The two detection balls 232 are respectively located on both sides of the first positioning rod 21, and when the first positioning rod 21 detects the wood 3, the arrangement direction of the two detection balls 232 is parallel to the extension direction of the wood 3. During the grinding process, when the wood 3 changes its diameter, the two detection balls 232 arranged on both sides of the first positioning rod 21 can detect the change in the diameter of the wood 3 in advance. The detection balls 232 drive the hair dryer 23 to rise and fall according to the undulations on the surface of the wood 3, thereby avoiding the lower end of the hair dryer 23 from scratching the surface of the wood 3.

[0056] The above embodiments merely represent one or several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several variations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the appended claims.

Claims

1. A cylindrical wood grinding device with an adjustment mechanism, comprising a grinding disc (1) for grinding wood (3) and a diameter measuring unit (2). The diameter measuring unit (2) includes a first positioning rod (21) and a second positioning rod (22) arranged vertically from top to bottom. The wood (3) passes horizontally between the first positioning rod (21) and the second positioning rod (22). It is characterized in that A hair dryer (23) is movably sleeved around the outer periphery of the first positioning rod (21) in the vertical direction. There is an annular gap between the hair dryer (23) and the first positioning rod (21). An annular fan (24) is rotatably arranged around the axis of the first positioning rod (21) within the annular gap. When the annular fan (24) is started, an air flow is generated from top to bottom, and the air flow is discharged from the lower end of the annular gap. Two detection rods (231) are symmetrically and fixedly arranged on the hair dryer (23). A detection ball (232) is rotatably arranged at the end of the detection rod (231) away from the hair dryer (23). When the end of the first positioning rod (21) contacts the surface of the wood (3), the two detection balls (232) are arranged along the length direction of the wood (3), and at least one detection ball (232) contacts the surface of the wood (3).

2. The cylindrical wood grinding device with an adjustment mechanism according to claim 1, characterized in that An annular magnetic drive (26) for driving the annular fan (24) to rotate is arranged on the inner wall of the hair dryer (23). When the hair dryer (23) rises relative to the first positioning rod (21), the power of the annular magnetic drive (26) increases. When the hair dryer (23) descends relative to the first positioning rod (21), the power of the annular magnetic drive (26) decreases.

3. The cylindrical wood grinding device with an adjustment mechanism according to claim 1, characterized in that A rolling ball (211) is rotatably arranged at the lower end of the first positioning rod (21). When the first positioning rod (21) and the second positioning rod (22) detect the diameter of the wood (3), the rolling ball (211) rolls in cooperation with the surface of the wood (3).

4. The cylindrical wood grinding device with an adjustment mechanism according to claim 2, characterized in that A sliding piece (235) electrically connected to the annular magnetic drive (26) is fixedly arranged on the inner wall of the hair dryer (23). A resistance column (233) is fixedly arranged on one side of the first positioning rod (21). A terminal (234) is arranged at the upper end of the resistance column (233). The sliding piece (235) is in sliding cooperation with the resistance column (233).

5. The cylindrical wood grinding device with an adjustment mechanism according to claim 1, characterized in that A scraping plate (212) is rotatably arranged around the axis of the first positioning rod (21) at the bottom of the first positioning rod (21). The scraping plate (212) is in sliding cooperation with the lower end of the first positioning rod (21). A transmission unit (213) is arranged between the annular fan (24) and the scraping plate (212). When the annular fan (24) rotates, it drives the scraping plate (212) to rotate through the transmission unit (213).

6. The cylindrical wood grinding device with an adjustment mechanism according to claim 5, characterized in that A first extension sleeve (2131) is fixedly arranged along the axis of the first positioning rod (21) above the annular fan (24). A second extension sleeve (2132) whose lower end is fixedly connected to the scraping plate (212) is rotatably arranged along the axis direction of the first positioning rod (21) on one side of the inner ring of the first extension sleeve (2131). The second extension sleeve (2132) sequentially passes through the inner ring of the annular fan (24) and the first extension sleeve (2131) from top to bottom. A speed reduction unit is arranged between the first extension sleeve (2131) and the second extension sleeve (2132).

7. The cylindrical wood grinding device with an adjustment mechanism according to claim 6, characterized in that The speed reduction unit includes a first rotating wheel (2133) rotatably arranged on one side of the first extension sleeve (2131). A first rotating belt (2134) that is in transmission cooperation with both is sleeved on the first rotating wheel (2133) and the first extension sleeve (2131). A second rotating wheel (2135) is fixedly arranged at the end of the first rotating wheel (2133). A second rotating belt (2136) that is in transmission cooperation with both is sleeved on the second rotating wheel (2135) and the second extension sleeve (2132). The diameter of the second rotating wheel (2135) is smaller than the diameter of the second extension sleeve (2132).

8. The cylindrical wood grinding device with an adjustment mechanism according to claim 1, characterized in that An air inlet pipe (236) for supplying air into the hair dryer (23) is arranged above the hair dryer (23). One end of the air inlet pipe (236) away from the hair dryer (23) is arranged on the side of the grinding disc (1) away from the wood (3).

9. The cylindrical wood grinding device with an adjustment mechanism according to claim 1, characterized in that A limiting plate (237) is fixedly arranged on the upper part of the hair dryer (23). When the hair dryer (23) is in the lowest position, the limiting plate (237) contacts the upper end of the first positioning rod (21).

10. The cylindrical wood grinding device with an adjustment mechanism according to claim 3, characterized in that The outer surface of the rolling ball (211) is coated with an anti-static coating.

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