CN111220044B

CN111220044B - Magnetic twist drill detection device

Info

Publication number: CN111220044B
Application number: CN202010222846.5A
Authority: CN
Inventors: 莫莉萍; 沈新阳; 蒋庆斌; 周斌; 钱金法
Original assignee: Changzhou Vocational Institute of Mechatronic Technology
Current assignee: Changzhou Vocational Institute of Mechatronic Technology
Priority date: 2020-03-26
Filing date: 2020-03-26
Publication date: 2021-06-18
Anticipated expiration: 2040-03-26
Also published as: CN111220044A

Abstract

The invention belongs to the technical field of machining detection tools, and relates to a magnetic twist drill detection device. The tail end of a ferromagnetic material main board of the detection device is of an arc-shaped structure, the upper surface of the arc-shaped structure is provided with angle scales, a V-shaped groove is fixed on the main board and used for placing a twist drill to be detected, the front end of the main board is provided with a front rotating shaft, the front rotating shaft is fixedly arranged on the main board and is vertical to the upper surface of the main board, the top end of the front rotating shaft is provided with a front rotating shaft cap, and the tail part of the main board; a long arm B rotating shaft is fixedly arranged on the long arm B, the long arm B rotating shaft is vertical to the upper surface of the long arm B, and a long arm shaft cap is arranged at the top end of the long arm B rotating shaft; the magnet B is installed on the bottom notch B of the long arm armor, the counter bore B is formed in the magnet B, the magnet B is fixed in the bottom notch B of the long arm armor through the screw hole B by the counter-head screw B, the long arm armor is always attached to the main board made of ferromagnetic materials, the detection of the twist drill is simple and convenient, the detection is universal, and measurement errors caused by the inclination of the long arm are not needed to be worried during detection.

Description

Magnetic twist drill detection device

Technical Field

The invention belongs to the technical field of machining detection tools, and relates to a magnetic twist drill detection device.

Background

The twist drill is a common cutter in machining and is also a vulnerable tool, repeated grinding is needed in the using process, the quality of a grinding drill directly influences the punching quality and the drilling efficiency, the service life of the twist drill is also influenced, the length and the angle of one main cutting edge need to be visually observed in front for checking whether the lengths of the two main cutting edges of the twist drill are equal or not and whether the angles of the two main cutting edges are equal or not during manual grinding, the length and the angle of the other main cutting edge need to be visually observed in front, the length and the angle of the other main cutting edge are visually observed after the twist drill rotates 180 degrees, repeated comparison is carried out, and the comparison has time and space intervals, so that the accuracy is difficult to maintain by the method, even if the twist drill is used for measuring, the measurement accuracy of the length of. When coping with the sharpening machine, ordinary sharpening machine is also only to guarantee that the coping angle is suitable, and does not guarantee that the length of two main cutting edges equals, patent application "a fluted drill detection device" provides the device of visual detection fluted drill main cutting edge length and angle, but the device in use need keep two long arms all the time with mainboard in close contact with, otherwise have the line of slope, can introduce the error, in addition lean on the limit automatic adjustment to suitable angle after, it has the angle to appear changing after touching carelessly easily, this will disperse partly attention, the smooth going on of influence detection.

Disclosure of Invention

The invention aims to provide a magnetic twist drill detection device, wherein a movable part of the device is adsorbed on a main board by magnetic attraction, so that errors caused by possible inclination and careless touch of a long arm are reduced, and the reliability of a detection result is improved.

The technical scheme of the invention is as follows:

a magnetic twist drill detection device comprises a main board, a V-shaped groove, a lower chute, a front rotating shaft and a front rotating shaft cap;

the tail end of the ferromagnetic material main board is of an arc-shaped structure, the upper surface of the arc-shaped structure is provided with angle scales, a V-shaped groove is fixed on the main board and used for placing a twist drill to be detected, the front end of the main board is provided with a front rotating shaft, the front rotating shaft is fixedly arranged on the main board and is vertical to the upper surface of the main board, the top end of the front rotating shaft is provided with a front rotating shaft cap, the tail part of the main board is provided with a lower sliding groove, a plane formed by the axis of the front rotating shaft and the center of the lower sliding groove is a central plane of the detection device and is marked as a central plane, the V;

the side surface of the tail part of the main board is also provided with 4 screw holes which are respectively a screw hole A, a screw hole B, a screw hole C and a screw hole D, correspondingly, the two sides of the chute frame are provided with 4 long circular holes which are respectively a long circular hole A, a long circular hole B, a long circular hole C and a long circular hole D, and the chute frame is fixed on the main board through the 4 screw holes and the 4 long circular holes by the screws A, the screws B, the screws C and the screws D;

the upper edge of the sliding chute frame is provided with an upper sliding chute, the vertical projection of the upper sliding chute on the main board is superposed with the lower sliding chute, the near edge A and the near edge B are respectively arranged on the main board through a round hole A and a round hole C and can rotate around the front rotating shaft, the near edge A is provided with a near edge shaft, and the near edge shaft is fixedly arranged on the near edge A and is vertical to the upper surface of the near edge A;

the round hole of the long arm nail is inserted on the side shaft, so that the long arm nail can rotate around the side shaft, the rear rotating shaft is fixedly arranged on the long arm nail and is vertical to the lower surface of the long arm nail, the lower surface of the rear rotating shaft is limited by the lower chute, the upper surface of the rear rotating shaft is limited by the upper chute, namely, the rear rotating shaft can only move back and forth along the lower chute and the upper chute, the lower top of the rear rotating shaft is provided with threads, and a hand-screwed nut A is arranged;

a long arm B rotating shaft is fixedly arranged on the long arm B, the long arm B rotating shaft is vertical to the upper surface of the long arm B, and a long arm shaft cap is arranged at the top end of the long arm B rotating shaft; a magnet B is installed in a bottom gap B of the long arm armor, a counter bore B is formed in the magnet B, and the magnet B is fixed in the bottom gap B of the long arm armor through a screw hole B by a counter-head screw B, so that the long arm armor is always attached to a main board made of ferromagnetic materials; the round hole D of the leaning edge B is inserted into the rotating shaft of the long arm B, so that the leaning edge B can rotate around the rotating shaft of the long arm B, and the rear rotating shaft is inserted into the round hole B of the long arm B, so that the long arm B can rotate around the rear rotating shaft; magnet A is installed to long arm second's bottom breach A, has counter bore A on the magnet A, passes through screw A by countersunk screw A and fixes magnet A in long arm second's bottom breach A, makes long arm second hug closely ferromagnetic material's mainboard all the time. The center of the rear rotating shaft is parallel to the center of the round hole, the distance between the two centers is recorded as the center distance of the long arm A, the center of the long arm B rotating shaft is parallel to the center of the round hole B, the distance between the two centers is recorded as the center distance of the long arm B, the center distance of the side shaft is parallel to the center of the round hole A, the center distance of the two centers is recorded as the center distance of the side A, a plane passing through the two shafts is recorded as the center plane of the side A, the center distance of the side A is parallel to the center of the round hole D, the center distance of the two shafts is recorded as the center distance of the side B, the plane passing through the two shafts is recorded as the center plane of the side B, the center distance of the long arm A is required to be equal to the center distance of the long arm B, the center distance of the side A is required to be equal to the center distance of the side B, the diameters of all.

The sliding plate is a knife-shaped plate and is provided with a knife edge, 3 cylinders are arranged on the mounting surface of the sliding plate and are respectively a cylinder A, a cylinder B and a cylinder C, wherein the top end of the cylinder A is provided with a cylinder cap A, the top end of the cylinder C is provided with a cylinder cap B, the top of the cylinder B is provided with threads, the 3 cylinders are all vertical to the mounting surface of the sliding plate, the diameter of the cylinder A is equal to that of the cylinder C, the plane formed by the axes of the two cylinders is vertical to the knife edge, two parallel long round holes, namely a sliding plate groove A and a sliding plate groove B, are arranged on the corresponding side A, and the sliding plate is arranged on the surface of the inner side surface; cylinder A and cylinder C can slide in slide groove B, and cylinder B slides in slide groove A simultaneously, and the distance that leans on the limit second constitutes to lean on limit second thick, and the face of leaning on limit first medial surface to medial surface) constitutes to lean on limit first thick, requires to lean on limit first thick and lean on limit second thick to equal, and from this, when the pivot moved in last spout and lower spout after, the angle that constitutes by slide medial surface and midplane and the angle that leans on limit first medial surface and midplane constitute equal all the time.

The invention has the beneficial effects that:

the detection of the twist drill is simple, convenient and universal, and measurement errors caused by the inclination of the long arm are not needed to be worried about during detection.

Drawings

Fig. 1 is a perspective view of the stabilized twist drill.

Fig. 2 is a perspective view of the stabilized twist drill detection apparatus after assembly.

Fig. 3 is a perspective view of the stabilized twist drill detection apparatus after assembly.

Fig. 4 is an exploded view of the stabilized twist drill detection apparatus.

Fig. 5 is an exploded view of the stabilized twist drill detection apparatus.

Fig. 6 is a schematic side view of the stable twist drill detection device.

Fig. 7 is a schematic diagram of a portion of the stabilized twist drill detection apparatus exploded.

Fig. 8 is a schematic diagram of a portion of the stabilized twist drill detection apparatus exploded.

Fig. 9 is a perspective view of the stabilized twist drill detection apparatus after assembly.

In the figure: 1, a twist drill; 2, a chisel edge; 3, turning a point A with a chisel edge; 4, turning point B of the chisel edge; 5; a main cutting edge A; 6, a main cutting edge B; 101 a main board; a 102V-shaped groove; 103 lower chute; 104 a front rotating shaft; 105 front rotating shaft cap; 106 screw holes A; 107 screw holes B; 108 screw holes C; 109 screw hole D; 110 oblong holes A; 111 oblong holes B; 112 oblong holes C; 113 oblong holes D; 114, a screw A; 115 screws B; 116 a screw C; 117; a screw D; 118 an upper chute; 119 a chute frame; 120 long armed nails; 121 rear rotating shaft; 122, screwing the nut A by hand; 123 circular holes; 124 folding the long arm nail; 125 a side armor; 126 round hole A; 127 by side axis; 128 side shaft caps; 129 long arm B; 130 round holes B; 131 long arm B rotating shaft; 132 long arm axle cap; 134 to the edge B; 135 circular hole C; 136 round hole D; 138 hand-screwing nut B; 139 a slide plate; 140 knife edges; 141 cylinder a; 142 cylindrical cap A; 143 cylinders B; 144 cylinders C; 145 cylindrical caps B; 146 slide plate groove A; 147 slide plate groove B; cutting a 148V-shaped groove; 170 thick near the edge B; 171 thick near-edge armor; 301, a notch A; 302 magnet A; 303 a countersunk screw A; 304 screw holes E; 305 counterbore a; 311, a notch B; 312 a magnet B; 313 countersunk head screw B; 314 screw hole F; 315 a counterbore B. 321, notch C; 322 a magnet C; 323 a countersunk screw C; 324 screw hole G; 325 counterbore C; 326 main board wing B; 327 long arm wing b; 331, notch D; 332 a magnet D; 333 countersunk head screws D; 334 screw hole H; 335 counter bore D; 336 main board wing armor; 337 Long arm pterygoid concha.

Detailed Description

The invention is described in further detail below with reference to the figures and the specific embodiments.

Example 1

As shown in fig. 2, 3, 4, and 5, the tail end of the main board 101 made of ferromagnetic material is an arc structure, the upper surface of the arc structure is provided with angle scales 163, a V-shaped groove 102 is fixed on the main board 101 and used for placing the twist drill 1 to be tested, the front end of the main board 101 is provided with a front rotating shaft 104, the front rotating shaft 104 is fixedly installed on the main board 101 and is perpendicular to the upper surface of the main board 101, the top end of the front rotating shaft 104 is provided with a front rotating shaft cap 105, the tail of the main board 101 is provided with a lower chute 103, a plane formed by the axis of the front rotating shaft 104 and the center of the lower chute 103 is a central plane of the detection device and is marked as a central plane, the V-shaped groove.

The side surface of the tail of the main plate 101 is also provided with 4 screw holes which are respectively a screw hole A106, a screw hole B107, a screw hole C108 and a screw hole D109, correspondingly, two sides of the sliding groove frame 119 are provided with 4 oblong holes which are respectively an oblong hole A110, an oblong hole B111, an oblong hole C112 and an oblong hole D113, and the sliding groove frame 119 is fixed on the main plate 101 through 4 screw holes and 4 oblong holes by a screw A114, a screw B115, a screw 16 and a screw D117.

An upper chute 118 is arranged on the upper side of the chute frame 119, the vertical projection of the upper chute 118 on the main board 101 coincides with the lower chute 103, a first side support 125 and a second side support 134 are respectively installed on the main board 101 through a round hole A126 and a round hole C135 and can rotate around the front rotating shaft 104, a first side support 127 is arranged on the first side support 125, and the first side support 127 is fixedly installed on the first side support 125 and is vertical to the upper surface of the first side support 125.

The round hole 123 of the long arm nail 120 is inserted on the side shaft 127, so that the long arm nail 120 can rotate around the side shaft 127, the rear rotating shaft 121 is fixedly installed on the long arm nail 120 and is vertical to the lower surface of the long arm nail 120, the lower surface of the rear rotating shaft 121 is limited by the lower chute 103, the upper surface of the rear rotating shaft is limited by the upper chute 118, namely, the rear rotating shaft 121 can only move back and forth along the lower chute 103 and the upper chute 118, the lower top of the rear rotating shaft 121 is provided with threads, and a hand screw nut A122 is installed.

The bottom notch B311 of the long arm A120 is provided with a magnet B312, the magnet B312 is provided with a counter bore B315, a counter head screw B313 fixes the magnet B312 in the bottom notch B311 of the long arm A120 through a screw hole F314, so that the long arm A120 is always tightly attached to the main board 101 made of ferromagnetic materials, the long arm B129 is fixedly provided with a long arm B rotating shaft 131, the long arm B rotating shaft 131 is vertical to the upper surface of the long arm B129, the top end of the long arm B rotating shaft 131 is provided with a long arm shaft cap 132, a round hole D136 of an adjacent side B134 is inserted in the long arm B rotating shaft 131, the adjacent side B134 can rotate around the long arm B rotating shaft 131, the rear rotating shaft 121 is inserted in the round hole B130 of the long arm B129, so that the long arm B129 can rotate around the rear rotating shaft 121, the bottom notch A301 of the long arm A129 is provided with a magnet A302, the magnet A302 is provided with a counter bore A305, the counter head screw A303 is fixed in the bottom notch A301 of the long arm A129 through a screw hole E304. The axial center of the rear rotating shaft 121 is parallel to the axial center of the round hole 123, the distance between the two axial centers is recorded as the central distance of the long arm A120, the axial center of the long arm B rotating shaft 131 is parallel to the axial center of the round hole B130, the distance between the two axial centers is recorded as the central distance of the long arm B129, the axial center of the side-close shaft 127 is parallel to the axial center of the round hole A126, the distance between the two axial centers is recorded as the central distance of the side-close A125, the plane passing through the two axial centers is recorded as the central plane of the side-close A125, the axial center of the round hole C135 is parallel to the axial center of the round hole D136, the distance between the two axial centers is recorded as the central distance of the side-close B134, the plane passing through the two axial centers is recorded as the central plane of the side-close B134, the central distance of the long arm A120 is required to be equal to the central distance of the long arm B129, the central distance of the.

As shown in fig. 2, 5 and 6, the sliding plate 139 is a knife-shaped plate and has a knife edge 140, the mounting surface of the sliding plate 139 has 3 cylinders, which are a cylinder a141, a cylinder B143 and a cylinder C144, wherein the top end of the cylinder a141 has a cylinder cap a142, the top end of the cylinder C144 has a cylinder cap B145, the top of the cylinder B143 has threads, 3 cylinders are all perpendicular to the mounting surface of the sliding plate 139, the diameter of the cylinder a141 is equal to the diameter of the cylinder C144, the plane formed by the axes of the two cylinders is perpendicular to the knife edge 140, the corresponding side B134 has two parallel oblong holes, i.e., a sliding plate slot a146 and a sliding plate slot B147, and the sliding plate 139 is mounted on the inner side surface (the surface facing the sliding plate holder 119) of the side B134. The cylinder A141 and the cylinder C144 can slide in the sliding plate groove B147, and the cylinder B143 slides in the sliding plate groove A146, the distance from the center plane of the side B134 to the inner side plane (the plane facing the sliding groove rack 119) of the sliding plate 139 forms the side B thickness 170, the distance from the center plane of the side A125 to the inner side plane (the plane facing the sliding groove rack 119) forms the side A thickness 171, the side A thickness 171 is required to be equal to the side B thickness 170, and therefore, when the rear rotating shaft 121 moves in the upper sliding groove 118 and the lower sliding groove 103, the angle formed by the inner side plane and the center plane of the sliding plate 139 and the angle formed by the inner side plane and the center plane of the side A125 are always equal.

The main plate 101 is made of ferromagnetic metal material, except for the magnets a302 and B312, which may be hard plastic or metal or alloy, but the sliding plate 139 is preferably made of harder metal or alloy to form the desired knife-edge 140.

Example 2

Sometimes, the twist drill 1 generates certain magnetism after being ground or for other reasons, and then the twist drill 1 rotates in the V-shaped groove 102 due to the influence of the magnet a302 and the magnet B312, and the second scheme is used for solving the problem. As shown in fig. 7, 8 and 9, the main board 101 is welded or bonded to be widened outwards to form a main board wing a 336 and a main board wing b 326, correspondingly, the long arm a 120 is expanded outwards to form a long arm wing a 337, the long arm b 129 is expanded outwards to form a long arm wing b 327, the countersunk screw D333 is screwed into the screw hole H334 through the countersunk hole D335, so that the magnet D332 is fixed in the notch D331 of the long arm wing a 337, and the countersunk screw C323 is screwed into the screw hole G324 through the countersunk hole C325, so that the magnet C322 is fixed in the notch C321 of the long arm wing b 327. The rest of the constitution is the same as the scheme one, and the operation is also the same.

In the second embodiment, in addition to the magnet C322 and the magnet D332, the main board wing a 336 and the main board wing b 326 are required to be made of ferromagnetic metal material, the long arm wing a 337 and the long arm wing b 327 are preferably made of ferromagnetic metal material, the main board 101, the long arm a 120 and the long arm b 129 are preferably made of non-ferromagnetic hard material, the sliding board 139 is preferably made of hard metal or alloy so as to form the desired knife edge 140, and the rest of the manufacturing materials may be hard plastic or metal and alloy.

Example 3

The using method of the invention is as follows:

when the twist drill 1 is detected, the twist drill 1 is placed in the V-shaped groove 102, the chisel edge 2 faces the front rotary shaft 104, the chisel edge 2 (or a connecting line between a chisel edge rotary point A3 and a chisel edge rotary point B4) is parallel to the central plane, the front part of the main cutting edge A5 is set to be an edge-leaning A125, if the relationship between the twist drill 1 and the preset angle is detected, two edge-leaning sides are adjusted to the preset angle, then the rear rotary shaft 121 is fixed with the main plate 101 by screwing the nut A122 with a hand, the sliding plate 139 is tightly screwed on the cylinder B143 by screwing the nut B138 with a hand after being tightly leaned on the edge A125, so that the sliding plate 139 is fixed on the edge-leaning side B134, the twist drill 1 moves forwards in the V-shaped groove 102, the chisel edge 2 (or a connecting line between the chisel edge rotary point A3 and the chisel edge rotary point B4) is kept parallel to the central plane until the head of the twist drill 1 is contacted with the edge-leaning side A125 or the sliding plate 139, and the relationship between, whether the lengths of the main cutting edge A5 and the main cutting edge B6 are equal or not can be preliminarily judged, the position relation between the main cutting edge A5 and the abutting edge A125 and the position relation between the main cutting edge B6 and the sliding plate 139 are observed, whether the angles of the main cutting edge A5 and the main cutting edge B6 are proper or not can be judged, and whether the length of the main cutting edge A5 is equal to the length of the main cutting edge B6 or not can be further judged. If only whether the main cutting edge A5 and the main cutting edge B6 of the twist drill 1 are symmetrical is detected, the hand nut B138 and the hand nut A122 are loosened, so that the included angle formed by the inner side surface of the side A125 and the inner side surface of the sliding plate 139 is in an adjustable state, the included angle is obviously smaller than the angle between the main cutting edge A5 and the main cutting edge B6, the twist drill 1 moves forwards in the V-shaped groove 102, the chisel edge 2 (or the connecting line between the chisel edge turning point A3 and the chisel edge turning point B4) is kept parallel to the central plane until the head of the twist drill 1 is in contact with the side A125 or the sliding plate 139, then the forward movement is slowly continued, the angle between the side A125 and the side B134 can be automatically adjusted, the twist drill 1 moves forwards until the side A125 and the side B134 are not adjusted, the position relation between the main cutting edge A5 and the side A125 and the position relation between the main cutting edge B6 and the sliding plate 139 are observed, whether the inclination of the main cutting edge A5 is equal to that of the main cutting edge B6 or not can be judged, then the sliding plate 139 is moved to the central plane, the knife edge 140 is enabled to be in contact with the side approaching A125, if the sliding plate 139 is blocked by the twist drill 1, the side approaching A125 cannot be contacted, the main cutting edge A5 is longer than the main cutting edge B6, if the knife edge 140 is in contact with the side approaching A125, the position relation of the chisel edge 2 and the knife edge 140 is observed, and the length relation of the main cutting edge A5 and the main cutting edge B6 can be judged.

Claims

1. A magnetic twist drill detection device is characterized by comprising a main board (101), a V-shaped groove (102), a lower chute (103), a front rotary shaft (104) and a front rotary shaft cap (105);

the tail end of the main board (101) is of an arc-shaped structure, the upper surface of the arc-shaped structure is provided with angle scales (163), a V-shaped groove (102) is fixed on the main board (101) and used for placing a twist drill (1) to be detected, the front end of the main board (101) is provided with a front rotating shaft (104), the front rotating shaft (104) is fixedly installed on the main board (101) and is perpendicular to the upper surface of the main board (101), the top end of the front rotating shaft (104) is provided with a front rotating shaft cap (105), the tail of the main board (101) is provided with a lower sliding groove (103), a plane formed by the axis of the front rotating shaft (104) and the center of the lower sliding groove (103) is a central plane of the detection device and is recorded as a central plane, the V-shaped groove (102;

the side face of the tail of the main board (101) is also provided with 4 screw holes which are respectively a screw hole A (106), a screw hole B (107), a screw hole C (108) and a screw hole D (109), correspondingly, two sides of the sliding chute frame (119) are provided with 4 long round holes which are respectively a long round hole A (110), a long round hole B (111), a long round hole C (112) and a long round hole D (113), and the sliding chute frame (119) is fixed on the main board (101) through 4 screw holes and 4 long round holes by a screw A (114), a screw B (115), a screw C (116) and a screw D (117);

an upper chute (118) is arranged on the upper side of the chute frame (119), the vertical projection of the upper chute (118) on the main board (101) is superposed with the lower chute (103), a side A (125) and a side B (134) are respectively installed on the main board (101) through a round hole A (126) and a round hole C (135) and can rotate around a front rotating shaft (104), a side shaft (127) is arranged on the side A (125), and the side shaft (127) is fixedly installed on the side A (125) and is vertical to the upper surface of the side A (125);

the round hole (123) of the long arm armor (120) is inserted on the side shaft (127), so that the long arm armor (120) can rotate around the side shaft (127), the rear rotating shaft (121) is fixedly installed on the long arm armor (120) and is vertical to the lower surface of the long arm armor (120), the lower surface of the rear rotating shaft (121) is limited by the lower sliding groove (103), the upper surface of the rear rotating shaft is limited by the upper sliding groove (118), namely, the rear rotating shaft (121) can only move back and forth along the lower sliding groove (103) and the upper sliding groove (118), the lower top of the rear rotating shaft (121) is provided with threads, and a hand screw nut A (122) is installed; a long arm B rotating shaft (131) is fixedly installed on the long arm B (129), the long arm B rotating shaft (131) is vertical to the upper surface of the long arm B (129), and a long arm shaft cap (132) is arranged at the top end of the long arm B rotating shaft (131);

a magnet B (312) is installed in a bottom gap B (311) of the long-arm armor (120), a counter bore B (315) is formed in the magnet B (312), and the magnet B (312) is fixed in the bottom gap B (311) of the long-arm armor (120) through a screw hole F (314) by a counter-head screw B (313), so that the long-arm armor (120) is always attached to the main board (101) made of ferromagnetic materials; the round hole D (136) of the leaning edge B (134) is inserted into the long arm B rotating shaft (131), so that the leaning edge B (134) can rotate around the long arm B rotating shaft (131), the rear rotating shaft (121) is inserted into the round hole B (130) of the long arm B (129), and the long arm B (129) can rotate around the rear rotating shaft (121); a magnet A (302) is installed in a bottom gap A (301) of the long arm B (129), a counter bore A (305) is formed in the magnet A (302), the magnet A (302) is fixed in the bottom gap A (301) of the long arm B (129) through a screw hole E (304) by a counter head screw A303, and the long arm B (129) is enabled to be attached to the main board (101) made of ferromagnetic materials all the time;

the sliding plate (139) is a knife-shaped plate and is provided with a knife edge (140), 3 cylinders are arranged on the mounting surface of the sliding plate (139), and are respectively a cylinder A (141), a cylinder B (143) and a cylinder C (144), wherein the top end of the cylinder A (141) is provided with a cylinder cap A (142), the top end of the cylinder B (143) is provided with a cylinder cap B (145), the top of the cylinder C (144) is provided with threads, the 3 cylinders are all vertical to the mounting surface of the sliding plate (139), the diameter of the cylinder A (141) is equal to that of the cylinder C (144), a plane formed by the axes of the two cylinders is vertical to the knife edge (140), two parallel oblong holes, namely a sliding plate groove A (146) and a sliding plate groove B (147), are formed in the corresponding near edge B (134), and the sliding plate (139) is mounted on the inner side face of the near edge B (134); the cylinder A (141) and the cylinder C (144) can slide in the slide plate groove B (147), and the cylinder B (143) can slide in the slide plate groove A (146).

2. The magnetic twist drill detecting device according to claim 1, wherein the axis of the rear rotating shaft (121) is parallel to the axis of the circular hole (123), the distance between the two axes is recorded as the center distance of the long arm A (120), the axis of the long arm B rotating shaft (131) is parallel to the axis of the circular hole B (130), the distance between the two axes is recorded as the center distance of the long arm B (129), the axis of the side shaft (127) is parallel to the axis of the circular hole A (126), the distance between the two axes is recorded as the center distance of the side A (125), a plane passing through the two axes is recorded as the center plane of the side A (125), the axis of the circular hole C (135) is parallel to the axis of the circular hole D (136), the distance between the two axes is recorded as the center distance of the side B (134), a plane passing through the two axes is recorded as the center plane of the side B (134), the center distance of the long arm A (120) is equal to the center distance of the long arm B (129), and the center distance of the side A (125) is equal to the center distance of the side B (134), the diameters of all the round holes related to the rotating shaft are equal, the outer diameters of all the rotating shafts are equal, and the diameters of the round holes are equal or are properly adjusted according to the roughness.

3. A magnetic twist drill testing device according to claim 1 or 2, wherein the long arm a folded edge (124) is perpendicular to the upper surface of the long arm a (120), the length of the long arm a folded edge (124) is equal to the height of the long arm b (129), i.e. the long arm a (120) and the long arm b (129) are both against the upper surface of the main plate (101) during the movement.

4. A magnetic twist drill detecting device according to claim 1 or 2, wherein the distance from the central plane of the second side b (134) to the inner side of the slide plate (139) constitutes the second side b thickness (170), the distance from the central plane of the first side b (125) to the inner side constitutes the first side b thickness (171), the first side b thickness (171) and the second side b thickness (170) are required to be equal, whereby, when the rear rotary shaft (121) moves in the upper slide groove (118) and the lower slide groove (103), the angle formed by the inner side of the slide plate (139) and the central plane and the angle formed by the inner side of the first side b (125) and the central plane are always equal.

5. A magnetic twist drill detecting device according to claim 3, wherein the distance from the central plane of the second side rest (134) to the inner side of the slide plate (139) constitutes the second side rest thickness (170), the distance from the central plane of the first side rest (125) to the inner side constitutes the first side rest thickness (171), the first side rest thickness (171) is required to be equal to the second side rest thickness (170), and thereby, when the rear rotary shaft (121) moves in the upper slide groove (118) and the lower slide groove (103), the angle formed by the inner side of the slide plate (139) and the central plane is always equal to the angle formed by the inner side of the first side rest (125) and the central plane.

6. A magnetic twist drill detecting device according to claim 1, 2 or 5, wherein the main board (101) is welded or bonded to be outwardly expanded to form a main board wing a (336) and a main board wing b (326), correspondingly, the long arm a (120) is outwardly expanded to form a long arm wing a (337), the long arm b (129) is outwardly expanded to form a long arm wing b (327), a countersunk head screw D (333) is screwed into the screw hole H (334) through the countersunk head D (335), so as to fix the magnet D (332) in the notch D (331) of the long arm wing a (337), and a countersunk head screw C (323) is screwed into the screw hole G (324) through the countersunk head screw C (325), so as to fix the magnet C (322) in the notch C (321) of the long arm wing b (327).

7. A magnetic twist drill detecting device according to claim 3, wherein the main plate (101) is welded or bonded to be outwardly expanded to form a main plate wing a (336) and a main plate wing b (326), the long arm wing a (120) is correspondingly outwardly expanded to form a long arm wing a (337), the long arm wing b (129) is outwardly expanded to form a long arm wing b (327), a countersunk screw D (333) passes through the countersunk hole D (335) and is screwed into the screw hole H (334) to fix the magnet D (332) in the notch D (331) of the long arm wing a (337), and a countersunk screw C (323) passes through the countersunk hole C (325) and is screwed into the screw hole G (324) to fix the magnet C (322) in the notch C (321) of the long arm wing b (327).

8. The magnetic twist drill detection device according to claim 4, wherein the main plate (101) is welded or bonded to be expanded outwards to form a main plate wing A (336) and a main plate wing B (326), the long arm A (120) is correspondingly expanded outwards to form a long arm wing A (337), the long arm B (129) is expanded outwards to form a long arm wing B (327), a countersunk head screw D (333) penetrates through the countersunk hole D (335) and is screwed into the screw hole H (334) so as to fix the magnet D (332) in the notch D (331) of the long arm wing A (337), and a countersunk head screw C (323) penetrates through the countersunk head hole C (325) and is screwed into the screw hole G (324) so as to fix the magnet C (322) in the notch C (321) of the long arm wing B (327).