CN111037490A

CN111037490A - A kind of woodworking protractor structure and positioning method for fast and accurate positioning

Info

Publication number: CN111037490A
Application number: CN201911417607.9A
Authority: CN
Inventors: 惠学姣; 秦晓钢; 皮文军
Original assignee: Nanjing Haige Woodworking Technology Co Ltd
Current assignee: Nanjing Haige Woodworking Technology Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-04-21
Anticipated expiration: 2039-12-31
Also published as: CN111037490B

Abstract

The invention provides a rapid and accurate positioning woodworking protractor structure and a positioning method thereof. The invention has the beneficial effects that: according to the invention, the positioning pin fixed at the front end of the swing positioning block is swung through the elastic element and clamped into the positioning clamping groove below the dial plate, two side walls of the positioning clamping groove are inclined planes and are of a V-shaped structure, the positioning pin is circular, the positioning pin can be quickly clamped into the positioning clamping groove when sliding to the side of the positioning clamping groove and is in point contact with any position of two side walls of the clamping groove, the positioning speed is high, and the positioning precision is high.

Description

Woodworking protractor structure capable of achieving rapid and accurate positioning and positioning method thereof

Technical Field

The invention relates to the technical field of woodworking machinery, in particular to a woodworking protractor structure capable of being quickly and accurately positioned and a positioning method thereof.

Background

Referring to fig. 1, a conventional quick positioning structure of a woodworking protractor is generally implemented by using a slot (hole) and a plug, and the working principle thereof is as follows: the quick positioning clamping groove 101 is arranged on the arc end face of the dial 102, the bolt 104 inserted into the clamping groove is pulled out through the handle 103, the dial 102 can be rotated to the other positioning clamping groove, then the handle is loosened, and the bolt 104 is inserted back into the new quick positioning clamping groove 101 again to achieve quick positioning.

According to the positioning method, manual plugging is needed each time a new positioning angle is converted, the operation speed is slow, and on the other hand, as the bolt 104 moves back and forth in the fixed seat through the handle 103, a gap exists between the bolt 104 and the fixed seat, so that the positioning accuracy of the positioning method is low.

In order to improve the rapid positioning accuracy of the protractor, the existing positioning method only depends on increasing the machining accuracy continuously, which undoubtedly increases the machining cost of the product. Moreover, manual plugging is needed when a new positioning angle is converted every time, the operation speed is low, and the function of fast fuzzy search cannot be realized.

How to solve the above technical problems is the subject of the present invention.

Disclosure of Invention

The invention aims to provide a woodworking protractor structure capable of being quickly and accurately positioned and a positioning method thereof.

The invention is realized by the following measures: the utility model provides a quick accurate positioning's carpenter protractor structure, includes the backer, sets up removal baffle on the backer is located the guide rail of backer one side is connected the calibrated scale positioning seat of backer below, fixed connection be in calibrated scale one of calibrated scale positioning seat below, a calibrated scale fixed connection in on the guide rail, wherein, calibrated scale arc circumference below be equipped with quick positioner one on the guide rail, a calibrated scale arc circumference side is equipped with the circular arc locating piece a plurality of quick positioning channel section one has been seted up to the equidistant on the circumference of circular arc locating piece.

The invention provides a further optimized scheme of a rapid and accurate positioning woodworking protractor structure, wherein a rapid positioning device I comprises a cover body arranged on a guide rail and a sliding button arranged on one side of the cover body;

the first quick positioning device further comprises a first positioning block rotating shaft arranged between two deep groove ball bearings on the cover body, the first positioning block rotating shaft is a first shaft-rotating swing positioning block, the bottom of the first positioning block rotating shaft is connected to the lower portion of the first swing positioning block, a first elastic piece on the guide rail is extruded at the top of the first elastic piece, and a positioning pin matched with the first quick positioning clamping groove is arranged at the driving end of the first swing positioning block.

The invention provides a further optimized scheme of a rapid and accurate positioning woodworking protractor structure, the cross section of the sliding button is trapezoidal, one side of the sliding button is provided with a convex bolt, the bolt can be inserted into a radial matching hole at one end of a rotating shaft of a positioning block, and the sliding button is tightly pressed in a sliding groove through a second elastic piece; one end of the first positioning block rotating shaft is pre-tightened through a screw.

The second elastic part is composed of a pressure spring connected to the inner side surface of the sliding button and a limiting pin connected to the spring, and the limiting pin is matched with the sliding groove.

As a further optimized scheme of the rapid and accurate positioning woodworking protractor structure provided by the invention, the first elastic element is a pressure spring of which the bottom is connected to the guide rail below the first swing positioning block, and the top of the pressure spring is extruded on the first swing positioning block.

The first swing positioning block is always kept in upward swing strength and movement trend through continuous elasticity of the first elastic piece, the positioning pin is continuously inserted into the first quick positioning clamping groove of the first dial scale, and the quick positioning function of the protractor is realized through structural design of the trapezoidal section of the first quick positioning clamping groove and elastic action of the first elastic piece.

The first positioning clamping groove is arranged below the first dial scale in an inclined mode, and two side walls of the first positioning clamping groove are inclined planes, so that the positioning pin can conveniently slide in an automatic alignment mode.

The inside wall of the first positioning clamping groove is completely meshed with the ball head of the positioning pin, so that the function of accurate positioning is realized, the inside wall of the first positioning clamping groove and the ball head of the positioning pin are not self-locked, and the ball head of the positioning pin can slide out along the side wall of the first positioning clamping groove under the action of large lateral external force, so that the first dial scale can be quickly and easily rotated to another required working angle to be positioned.

The swinging of the positioning pin is realized by swinging the first positioning block and rotating the first positioning block rotating shaft around the center of the base hole on the angle fixing seat; when the first swing positioning block swings downwards to the lowest position, the positioning pin is completely pulled out of the first quick positioning clamping groove, the sliding button can be pushed to lock the first positioning block rotating shaft immovably, and the quick positioning function of the protractor is released.

Two ends of a positioning block rotating shaft on the first swing positioning block are respectively fixed on the two deep groove ball bearings, and the other end of the positioning block rotating shaft is pre-tightened through a screw to eliminate the play of the deep groove ball bearings, so that the axial and radial positioning accuracy of the first swing positioning block is improved.

The number of the first quick positioning clamping grooves is 3-11, and the quick positioning clamping grooves are arranged at corresponding positions below the first dial according to the quick positioning requirements of common working angles of the dial.

And the first swing positioning block rotates around the center of the base hole on the cover body through the first self positioning block rotating shaft.

And the first swing positioning block realizes upward swing motion through the first elastic piece.

The head of the positioning pin is spherical, conical or circular arc.

The sliding button is installed and pre-tightened in the sliding groove on the cover body through the elastic piece II.

In order to better achieve the purpose, the invention further provides a rapid and accurate positioning woodworking protractor structure, which comprises a backer, a movable baffle arranged on the backer, a guide rail positioned on one side of the backer, a dial positioning seat connected below the backer, and a dial II fixedly connected below the dial positioning seat, wherein the dial II is fixedly connected on the guide rail.

As a further optimized scheme of the rapid and accurate positioning woodworking protractor structure provided by the invention, the rapid positioning device II comprises a shell arranged on the guide rail and a rapid positioning knob arranged on one side of the shell;

the second quick positioning device further comprises a second positioning block rotating shaft hinged to the shell, the second positioning block rotating shaft serves as a second swing positioning block rotating around the second positioning block rotating shaft, a clamping groove is formed in the circumferential direction of a rotating portion of the second swing positioning block, and the clamping groove is meshed with elastic wave beads arranged on the shell.

The invention provides a further optimized scheme of a rapid and accurate positioning woodworking protractor structure, wherein the elastic wave beads are telescopic springs arranged in the direction vertical to the axis of the positioning block rotating shaft II, and limit wave beads connected to the free end parts of the telescopic springs are formed, and the limit wave beads are matched with the clamping grooves.

In order to better achieve the above purpose, the present invention further provides a positioning method of a carpentry protractor structure with rapid and accurate positioning, which specifically comprises the following steps:

step S1: the first swing positioning block swings upwards around the first positioning block rotating shaft under the action of the elastic force of the first elastic piece, so that the positioning pin is always in contact with the lower surface of the arc positioning block;

step S2: the first dial is rotated until the first dial is rotated to a working angle needing positioning, the positioning pin automatically slides into the first quick positioning clamping groove under the action of the first elastic piece, inclined planes on two sides of the first quick positioning clamping groove are in contact with the spherical surface of the positioning pin, and the positioning pin is clamped into the first positioning clamping groove under the action of the elastic piece, so that quick and accurate positioning is realized;

step S3: when a user does not use the quick positioning function, the upper end plane of the first swing positioning block is pressed down to enable the first swing positioning block to swing to the lowest position, the positioning pin is pulled out of the first quick positioning clamping groove, then the sliding button is pushed rightwards, the bolt on the right side of the sliding button slides into a radial positioning hole of the first positioning block rotating shaft, and therefore the first swing positioning block is locked to prevent the first swing positioning block from swinging upwards.

step S1: the second swing positioning block swings upwards around the rotating shaft of the positioning block through the quick positioning knob, the elastic wave beads are inserted into the clamping groove of the second swing positioning block, the second dial is rotated until the angle needing to be positioned is reached, and the right side of the second swing positioning block is contacted with the quick positioning flange on the quick positioning block so as to realize quick positioning;

step S2: when the quick positioning is not used, the quick positioning knob is rotated, and the elastic wave beads are inserted into the clamping grooves of the second swing positioning block, so that the second swing positioning block is prevented from swinging upwards.

The invention has the beneficial effects that: the positioning pin fixed at the front end of the swinging positioning block swings through the elastic piece and is clamped into the positioning clamping groove below the dial scale, two side walls of the positioning clamping groove are inclined planes and are of a V-shaped structure, the positioning pin is circular, the positioning pin can be quickly clamped into the positioning clamping groove when sliding to the side of the positioning clamping groove and is in point contact with any position of two side walls of the clamping groove, the positioning speed is high, and the positioning accuracy is high.

Drawings

FIG. 1 is a schematic structural view of a conventional woodworking protractor;

FIG. 2 is a schematic view of the woodworking protractor positioning of the present invention;

FIG. 3 is a schematic structural view of the rapid and precise positioning woodworking protractor structure and the positioning method thereof;

FIG. 4 is a rear view of FIG. 3;

FIG. 5 is a left side view of FIG. 3;

FIG. 6 is a cross-sectional view taken along the direction C-C;

FIG. 7 is a cross-sectional view A-A of FIG. 5;

FIG. 8 is a cross-sectional view B-B of FIG. 5;

FIG. 9 is a schematic structural view of embodiment 2 of the present invention;

FIG. 10 is a rear view of FIG. 9;

FIG. 11 is a left side view of FIG. 9;

FIG. 12 is a cross-sectional view taken along line D-D of FIG. 9;

fig. 13 is a partially enlarged schematic view of region I of fig. 12.

Wherein the reference numerals are: 101. quickly positioning the clamping groove; 102. a dial scale; 103. a handle; 104. a bolt; 105. a fixed seat; 1. backing a mountain; 2. moving the baffle; 3. a guide rail; 4. a dial positioning seat; 201. a first dial scale; 202. a first quick positioning device; 203. arc positioning blocks; 204. quickly positioning the first clamping groove; 5. a cover body; 205. a slide button; 206. a first positioning block rotating shaft; 207. positioning pins; 208. swinging the first positioning block; 209. a first elastic part; 210. a second elastic piece; 211. a sliding groove; 213. a screw; 212. a deep groove ball bearing; 301. a second dial scale; 302. a second quick positioning device; 303. quickly positioning the blocks; 304. rapidly positioning the flange; 305. a quick positioning knob; 306. swinging the positioning block II; 307. elastic wave beads; 308. a second positioning block rotating shaft; 309. a card slot; 6. a housing.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described herein are merely illustrative of the invention and are not intended to be limiting.

It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.

In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.

Example 1

Referring to fig. 2 to 8, the invention provides a technical scheme that the quick and accurate positioning woodworking protractor structure comprises a backer 1, a movable baffle 2 arranged on the backer 1, a guide rail 3 positioned on one side of the backer 1, a dial positioning seat 4 connected below the backer 1, a dial one 201 fixedly connected below the dial positioning seat 4, and the dial one 201 is fixedly connected on the guide rail 3, wherein a quick positioning device one 202 is arranged on the guide rail 3 below the arc circumference of the dial one 201, an arc positioning block 203 is arranged on one side surface of the arc circumference of the dial one 201, and a plurality of quick positioning clamping grooves one 204 are arranged on the circumference of the arc positioning block 203 at equal intervals.

As a further optimized scheme of the rapid and accurate positioning woodworking protractor structure provided by the invention, the rapid positioning device I202 comprises a cover body 5 arranged on the guide rail 3, and a sliding button 205 arranged on one side of the cover body 5;

the first quick positioning device 202 further comprises a first positioning block rotating shaft 206 arranged between the two deep groove ball bearings 212 on the cover body 5, a first swing positioning block 208 rotating by taking the first positioning block rotating shaft 206 as a shaft, a first elastic element 209 connected to the guide rail 3 below the first swing positioning block 208 at the bottom, wherein the top of the first elastic element 209 is extruded on the first swing positioning block 208, and a positioning pin 207 matched with the first quick positioning clamping groove 204 is arranged at the driving end of the first swing positioning block 208.

As a further optimized scheme of the rapid and accurate positioning woodworking protractor structure provided by the invention, the cross section of the sliding button 205 is trapezoidal, one side of the sliding button 205 is provided with a convex plug pin, the plug pin can be inserted into a radial matching hole at one end of a rotating shaft 206 of a positioning block, and the sliding button 205 is pressed tightly in the sliding groove 211 through an elastic piece II 210; one end of the first positioning block rotating shaft 206 is pre-tightened through a screw 213.

As a further optimized scheme of the rapid and accurate positioning woodworking protractor structure provided by the invention, the second elastic part 210 is composed of a pressure spring connected to the inner side surface of the sliding button 205 and a limit pin connected to the spring, and the limit pin is matched with the sliding groove 211.

As a further optimized scheme of the rapid and accurate positioning woodworking protractor structure provided by the invention, the first elastic element 209 is a pressure spring of which the bottom is connected to the guide rail 3 below the first swing positioning block 208, and the top of the pressure spring is extruded on the first swing positioning block 208.

The swing positioning block I208 always keeps upward swing force and movement trend through continuous elasticity of the elastic piece I209, the positioning pin 207 is continuously inserted into the quick positioning clamping groove I204 of the dial I201, and the quick positioning function of the protractor is realized through the structural design of the trapezoidal section of the quick positioning clamping groove I204 and the elasticity action of the elastic piece I209.

The first positioning clamping groove 204 is arranged at the oblique lower part of the first dial 201, and two side walls of the first positioning clamping groove 204 are inclined planes, so that the positioning pin 207 can be conveniently and automatically aligned and slide in.

The inside wall of the first positioning groove 204 is completely meshed with the ball head of the positioning pin 207, so that the accurate positioning function is realized, the inside wall and the ball head of the positioning pin 207 are not self-locked, and the ball head of the positioning pin 207 can slide out along the side wall of the first positioning groove 204 under the action of a large lateral external force, so that the first dial 204 can be quickly and easily rotated to another required working angle for positioning.

The swinging of the positioning pin 207 is realized by swinging the first positioning block 208 and rotating the first positioning block rotating shaft 206 around the center of the base hole on the angle fixing seat; when the first swing positioning block 208 swings downwards to the lowest position, the positioning pin 207 is completely pulled out from the first quick positioning clamping groove 204, the sliding button 205 can be pushed to lock the first positioning block rotating shaft 206 immovably, and the quick positioning function of the protractor is released.

Two ends of a positioning block rotating shaft 206 on the first swing positioning block 208 are respectively fixed on two deep groove ball bearings 212, and the other end of the positioning block rotating shaft 206 is pre-tightened through a screw 213 to eliminate the play of the deep groove ball bearings 212, so that the axial and radial positioning accuracy of the first swing positioning block 208 is improved.

The number of the first quick positioning clamping grooves 204 is 3-11, and the quick positioning clamping grooves are arranged at corresponding positions below the first dial 201 according to the quick positioning requirement of the common working angle of the dial.

The first swing positioning block 208 rotates around the center of the base hole on the cover 5 through the first self positioning block rotating shaft 206.

The first swing positioning block 208 realizes the upward swing movement thereof through the first elastic element 209.

The head of the positioning pin 207 is spherical, conical or circular arc shaped.

The sliding button 205 is mounted and pre-tensioned in a sliding groove on the cover 5 through a second elastic element 210.

step S1: the trend and the strength of the swing positioning block I208 swinging upwards around the positioning block rotating shaft I206 are caused by the elastic action of the elastic element I209, so that the positioning pin 207 is always contacted with the lower surface of the arc positioning block 203;

step S2: the first dial 201 is rotated until the first dial is rotated to a working angle needing positioning, the positioning pin 207 automatically slides into the first quick positioning clamping groove 204 under the action of the first elastic piece 209, inclined planes on two side faces of the first quick positioning clamping groove 204 are in contact with a spherical surface of the positioning pin 207, and the positioning pin 207 is clamped into the first positioning clamping groove 204 under the elastic action of the first elastic piece 209, so that quick and accurate positioning is realized;

step S3: when the user does not use the quick positioning function, the upper end plane of the first swing positioning block 208 is pressed down, the first swing positioning block 208 swings to the lowest position, the positioning pin 207 is pulled out of the first quick positioning clamping groove 204, then the sliding button 205 is pushed rightwards, the bolt on the right side of the sliding button slides into a radial positioning hole of the first positioning block rotating shaft 206, and therefore the first swing positioning block 208 is locked to prevent the first swing positioning block 208 from swinging upwards.

Example 2

Referring to fig. 9 to 13, a carpenter's protractor structure of quick accurate positioning, including backer 1, set up removal baffle 2 on backer 1, be located guide rail 3 of backer 1 one side, connect dial positioning seat 4 in backer 1 below, two 301 of calibrated scale of fixed connection below dial positioning seat 4, two 301 of calibrated scale fixed connection on guide rail 3, its characterized in that is equipped with two 302 of quick positioner on guide rail 3 of two 301 arc circumferences below of calibrated scale, two 301 arc circumferences of calibrated scale side equidistant be equipped with a plurality of quick locating piece 303, be equipped with quick location flange 304 in quick locating piece 303 circumference.

As a further optimized scheme of the rapid and accurate positioning woodworking protractor structure provided by the invention, the second rapid positioning device 302 comprises a shell 6 arranged on the guide rail 3, and a rapid positioning knob 305 arranged on one side of the shell 6;

the second quick positioning device 302 further includes a second positioning block rotating shaft 308 hinged to the housing 6, a second swing positioning block 306 rotating around the second positioning block rotating shaft 308, a clamping groove 309 is formed in the circumferential direction of a rotating portion of the second swing positioning block 306, and the clamping groove 309 is engaged with an elastic wave bead 307 arranged on the housing 6.

As a further optimized scheme of the rapid and accurate positioning woodworking protractor structure provided by the invention, the elastic wave beads 307 are extension springs arranged in the direction vertical to the axis of the second positioning block rotating shaft 308 and are formed by limiting wave beads connected to the free end parts of the extension springs, and the limiting wave beads are matched with the clamping grooves 309.

step S1: enabling the second swing positioning block 306 to swing upwards around the second positioning block rotating shaft 308 through the quick positioning knob 305, inserting the elastic wave bead 307 into a clamping groove 309 of the second swing positioning block 306, rotating the second dial 301 until the angle needing positioning is reached, and enabling the right side of the second swing positioning block 306 to be in contact with a quick positioning flange 304 on the quick positioning block 303 so as to realize quick positioning;

step S2: when the quick positioning is not used, the quick positioning knob 305 is rotated, and the elastic wave bead 307 is inserted into the clamping groove 309 of the second swing positioning block 306, so that the second swing positioning block 306 is prevented from swinging upwards.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A woodworking protractor structure for fast and precise positioning, comprising a backer (1), a moving baffle plate (2) arranged on the backer (1), a guide rail (3) on one side of the backer (1), The dial positioning seat (4) connected to the bottom of the backer (1), the dial one (201) fixedly connected to the bottom of the dial positioning seat (4), and the dial one (201) being fixedly connected to On the guide rail (3), it is characterized in that a quick positioning device (202) is provided on the guide rail (3) below the arc-shaped circumference of the dial one (201), and the dial one (201) A circular arc positioning block (203) is provided on one side of the arc-shaped circumference, and a plurality of quick positioning grooves (204) are provided at equal intervals on the circumference of the circular arc positioning block (203).

2. The woodworking protractor structure for fast and precise positioning according to claim 1, characterized in that, the fast positioning device one (202) comprises a cover body (5) arranged on the guide rail (3), and is arranged on the a sliding button (205) on one side of the cover body (5);

The quick positioning device one (202) further comprises a positioning block rotating shaft one (206) arranged between the two deep groove ball bearings (212) on the cover body (5), with the positioning block rotating shaft one (206). 206) is a swing positioning block 1 (208) that pivots, and the bottom is connected to an elastic piece (209) on the guide rail (3) below the swing positioning block 1 (208), and the elastic piece 1 (209) ) is pressed against the first swing positioning block (208), and the driving end of the swing positioning block one (208) is provided with a positioning pin (207) that cooperates with the first quick positioning slot (204).

3. The woodworking protractor structure of fast and precise positioning according to claim 2 is characterized in that, the cross-sectional shape of the sliding button (205) is a trapezoid, and one side of the sliding button (205) is provided with a protruding latch, The plug can be inserted into the radial matching hole at one end of the positioning block shaft one (206), and the sliding button (205) is pressed into the sliding groove (211) by the elastic member two (210); the positioning block shaft One (206) end is preloaded by screw (213).

4. The woodworking protractor structure for fast and precise positioning according to claim 3, characterized in that, the second elastic member (210) consists of a compression spring connected to the inner side of the sliding button (205) and a compression spring connected to the spring The limit pin on the upper part is formed, and the limit pin cooperates with the sliding groove (211).

5. The woodworking protractor structure for fast and precise positioning according to claim 2, wherein the first elastic member (209) is the guide rail (3) whose bottom is connected to the bottom of the first swing positioning block (208). The top of the compression spring is pressed against the swing positioning block 1 (208).

6. A woodworking protractor structure for fast and precise positioning, comprising a backer (1), a moving baffle plate (2) arranged on the backer (1), a guide rail (3) located on one side of the backer (1), The dial positioning seat (4) connected to the bottom of the backer (1) is fixedly connected to the second dial (301) below the dial positioning seat (4), and the second dial (301) is fixedly connected to the On the guide rail (3), it is characterized in that a second quick positioning device (302) is provided on the guide rail (3) below the arc circumference of the second dial (301), and the second dial (301) ) A plurality of quick positioning blocks (303) are arranged at equal intervals on one side of the arc-shaped circumference, and quick positioning ribs (304) are arranged in the circumferential direction of the quick positioning blocks (303).

7. The woodworking protractor structure for fast and precise positioning according to claim 6, characterized in that the second fast positioning device (302) comprises a housing (6) arranged on the guide rail (3), and is arranged on the the quick positioning knob (305) on one side of the casing (6);

The second quick positioning device (302) further comprises a second positioning block rotating shaft (308) hinged on the housing (6), and a second swing positioning block (306) that rotates around the second positioning block rotating shaft (308) as an axis ), the rotating part of the second swing positioning block (306) is provided with a clamping groove (309) in the circumferential direction, the clamping groove (309) and the elastic wave ball (307) arranged on the casing (6) mesh with each other.

8. The woodworking protractor structure for fast and precise positioning according to claim 6, wherein the elastic wave bead (307) is a telescopic spring arranged in a direction perpendicular to the axis of the positioning block rotating shaft two (308), It consists of a limit wave ball connected to the free end of the telescopic spring, and the limit wave ball cooperates with the clamping groove (309).

9. a kind of positioning method based on the woodworking protractor structure described in any one of claim 1-5, it is characterized in that, comprise the following steps:

Step S1: the tendency and force of swinging positioning block one (208) to swing upward around the positioning block axis one (206) through the elastic action of elastic member one (209), so that the positioning pin (207) is always connected to the arc positioning block (203). ) are in contact with the lower surface;

Step S2: Rotate the dial one (201) until it reaches the working angle that needs to be positioned, the positioning pin (207) automatically slides into the quick positioning slot one (204) under the action of the elastic piece (209), and When the inclined surfaces on both sides of the quick positioning slot 1 (204) are in contact with the spherical surface of the positioning pin (207), the positioning pin (207) makes the positioning pin (207) snap into the positioning slot 1 (209) under the elastic force of the elastic member 1 (209). 204), to achieve fast and accurate positioning;

Step S3: When the user does not use the quick positioning function, press the upper end plane of the swing positioning block one (208) to swing the swing positioning block one (208) to its lowest position, and move the positioning pin (207) from the quick positioning Pull out from the slot one (204), then push the sliding button (205) to the right, and let the latch on the right side slide into a radial positioning hole of the positioning block shaft one (206), thereby locking the swing positioning block one (206). 208) to prevent it from swinging upwards.

10. a positioning method based on the woodworking protractor structure of any one of claims 6-8, characterized in that, comprising the following steps:

Step S1: Use the quick positioning knob (305) to make the second swing positioning block (306) swing up around the second positioning block rotating shaft (308), and the elastic wave ball (307) is inserted into the slot (309) of the second swing positioning block (306). , Rotate the second dial (301) until it reaches the angle that needs to be positioned, so that the right side of the second swing positioning block (306) is in contact with the quick positioning rib (304) on the quick positioning block (303), so as to achieve rapid position;

Step S2: When the quick positioning is not used, rotate the quick positioning knob (305), and the elastic wave ball (307) is inserted into the slot (309) of the second swing positioning block (306), so that the second swing positioning block (306) prevents the Swing upwards.