Forestry field measuring instrument

Abstract

The utility model relates to the technical field of forestry measuring equipment, and discloses a forestry field measuring instrument which comprises a waistband, a measuring instrument body and a Velcro suede arranged on the inner side of the waistband, and further comprises a Velcro hook surface arranged on the outer side of the waistband, and the surface of the waistband is in bolted connection with a mounting plate; the measuring instrument can be connected with the measuring instrument in use under the matching of the waistband, the Velcro suede and the Velcro hook surface, and the measuring instrument body can be conveniently clamped and fixed under the matching of the arc-shaped clamp, the connecting plate, the screw rod and the quick release mechanism, so that a worker does not need to hold the measuring instrument body for measurement for a long time, and the measuring instrument is convenient to use. Through cooperation of the upper connecting rod, the lower connecting rod and the telescopic mechanism, the height of the measuring instrument body can be adjusted in a lifting mode, meanwhile, through cooperation of the adjusting mechanism, the rotating shaft and the lower connecting rod, the inclination distance between the measuring instrument body and a user can be adjusted, and the using comfort of users of different heights and figures can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of forestry measurement equipment, in particular to a forestry field measurement instrument. Background Art

[0002] Forestry field measuring instruments are instruments and equipment specially used for forest resource investigation and measurement. They are widely used in forest management, environmental protection and other fields. 3D laser scanners are commonly used instruments in forestry field measurement. They use laser beams to scan the distance and position of target objects, and record laser point cloud data to generate high-precision 3D point cloud models.

[0003] In order to cover the entire measurement area and obtain complete data, some existing 3D laser scanners usually require workers to hold them in their hands and then walk freely in the measurement area to achieve the effect of measurement and recording. However, when faced with large-area measurement tasks, workers hold the device in their hands and continue walking and measuring for a long time, which will cause fatigue and discomfort in the workers' hand muscles, thereby affecting the efficiency of the measurement work and increasing the discomfort of the operator. Utility Model Content

[0004] The purpose of the utility model is to provide a forestry field measuring instrument to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a forestry field measuring instrument, comprising a waist belt, a measuring instrument body and a Velcro velvet surface arranged on the inner side of the waist belt, and also comprising:

[0006] A Velcro hook surface is arranged on the outside of the waistband, a mounting plate is bolted to the surface of the waistband, two places on one side of the mounting plate are bolted to support plates, and a rotating shaft is rotatably connected between the support plates;

[0007] A lower connecting rod is fixedly connected to the surface of the rotating shaft, a receiving cavity is opened at the top of the lower connecting rod, a connecting rod is slidably connected to the inner wall of the receiving cavity, and an upper connecting rod is fixedly connected to the top of the connecting rod;

[0008] An arc-shaped card is fixedly connected to the top of the upper connecting rod, and both ends of the arc-shaped card are fixedly connected to connecting plates. A screw is arranged between the connecting plates, and a quick-release mechanism is arranged on the surface of the screw;

[0009] A telescopic mechanism is used to adjust the distance between the lower connecting rod and the upper connecting rod. The surface of the mounting plate is provided with an adjusting mechanism, and the adjusting mechanism is used in conjunction with the rotating shaft.

[0010] Preferably, the quick-release mechanism includes a fixing sleeve threadedly connected to the surface of the screw and a limiting ring fixedly connected to one side of the surface of the fixing sleeve, the limiting rings are two in number and are respectively slidably connected to the two sides of the connecting plate, the surface of the fixing sleeve is fixedly connected to a limiting strip, the number of the limiting strips is several and are distributed in a ring array at the center of the fixing sleeve, the surface of the fixing sleeve is slidably connected to a rotating ring, the inner wall of the rotating ring is provided with a limiting groove, the limiting groove corresponds to the number of clamping columns and are slidably connected to each other, one side of the rotating ring is fixedly connected to a clamping column, the number of the clamping columns is several and are distributed in a ring array at the center of the rotating ring, a locking hole is provided on one side of the connecting plate, the number of the clamping column matches the number of the locking hole and they are slidably connected to each other.

[0011] Preferably, the telescopic mechanism includes a movable sleeve arranged between the lower connecting rod and the upper connecting rod and a threaded section arranged on the surface of the lower connecting rod, the inner wall of the movable sleeve is provided with a threaded groove, the threaded section and the threaded groove are threadedly connected, the surface of the upper connecting rod is provided with an annular groove, the top of the inner wall of the movable sleeve is fixedly connected with a retaining ring, and the retaining ring is slidably connected to the annular groove.

[0012] Preferably, the adjustment mechanism comprises a support shell bolted to the surface of the mounting plate and a worm gear bolted to the surface of the rotating shaft, and one side of the worm gear is meshingly connected with a worm.

[0013] Preferably, the cross-sectional shape of the inner cavity of the accommodating cavity is rectangular, and the connecting rod matches the shape of the accommodating cavity.

[0014] Preferably, the inner wall of the arc card is provided with a rubber pad

[0015] Preferably, a magnet ring is embedded in the inner wall of the connecting plate, and the clamping column is made of nickel-iron alloy.

[0016] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0017] 1. The utility model can firmly connect the device during use through the cooperation of the waist belt, Velcro velvet surface and Velcro hook surface, and the measuring instrument body can be conveniently clamped and fixed through the cooperation of the arc card, connecting plate, screw and quick release mechanism, without the need for the staff to hold the measuring instrument body for a long time for measurement, which can reduce the labor burden and discomfort of the staff, thereby improving the measurement efficiency.

[0018] 2. The utility model can adjust the height of the measuring instrument body by the cooperation of the upper connecting rod, the lower connecting rod and the telescopic mechanism, ensuring that the measuring instrument body can adapt to measuring objects of different heights. At the same time, through the cooperation of the adjustment mechanism, the rotating shaft and the lower connecting rod, the inclination distance between the measuring instrument body and the user can be adjusted, which can improve the comfort of users of different heights and body shapes when using the device for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 It is a schematic diagram of the expanded cross-sectional structure of the lower connecting rod and the supporting shell in the utility model;

[0021] Figure 3 For this utility model Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0022] Figure 4 It is a schematic diagram of the cross-sectional structure of the movable sleeve in the utility model;

[0023] Figure 5 It is a schematic diagram of the cross-section structure of the movable sleeve and the lower connecting rod in the utility model;

[0024] Figure 6 For this utility model Figure 5 A schematic diagram of the enlarged structure at B in the middle;

[0025] Figure 7 It is a schematic diagram of a local structure in the utility model;

[0026] Figure 8 It is a schematic diagram of the cross-sectional development structure of the connecting plate and the screw in the utility model;

[0027] Fig. 9 It is a schematic diagram of the partial expansion structure of the quick-release mechanism and the screw rod in the utility model.

[0028] In the figure: 1. belt; 2. mounting plate; 3. support plate; 4. rotating shaft; 5. lower connecting rod; 6. adjusting mechanism; 61. supporting shell; 62. worm gear; 63. worm; 7. telescopic mechanism; 71. movable sleeve; 72. threaded section; 73. threaded groove; 74. ring groove; 75. snap ring; 8. upper connecting rod; 9. quick release mechanism; 91. fixed sleeve; 92. rotating ring; 93. limiting strip; 94. limiting groove; 95. clamping column; 96. locking hole; 97. limiting ring; 10. screw; 11. Velcro velvet; 12. Velcro hook surface; 13. measuring instrument body; 14. accommodating chamber; 15. connecting rod; 16. arc clamp; 17. connecting plate; 18. magnet ring; 19. rubber pad. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] See also Figure 1-9As shown, a forestry field measuring instrument comprises a waist belt 1 and a measuring instrument body 13, wherein a Velcro velvet surface 11 is arranged on the inner side of the waist belt 1, and a Velcro hook surface 12 is arranged on the outer side of the waist belt 1. When in use, the two ends of the waist belt 1 are wrapped around the waist of the user, and then the Velcro velvet surface 11 and the Velcro hook surface 12 are bonded to each other, thereby the waist belt 1 can be tightly tied to the waist of the user, and at the same time, it can also be conveniently disassembled and reused, thereby ensuring the firmness of the device during use and effectively avoiding slippage during use. A mounting plate 2 is bolted to the surface of the waist belt 1, and support plates 3 are bolted to two places on one side of the mounting plate 2, and a rotating shaft 4 is arranged between the support plates 3, and the two ends of the rotating shaft 4 respectively penetrate to the outer side of the support plate 3 and pass through the shaft at the penetration point. The bearings are fixed to each other, and the surface of the rotating shaft 4 is fixedly connected with the lower connecting rod 5. The top of the lower connecting rod 5 is provided with a accommodating chamber 14. The cross-sectional shape of the inner cavity of the accommodating chamber 14 is rectangular. The inner wall of the accommodating chamber 14 is slidably connected with a connecting rod 15. The connecting rod 15 matches the shape of the accommodating chamber 14. The top of the connecting rod 15 extends to the top of the lower connecting rod 5 through the accommodating chamber 14. The top of the connecting rod 15 is fixedly connected with an upper connecting rod 8. With the cooperation of the shapes of the accommodating chamber 14 and the connecting rod 15 themselves, it can prevent the lower connecting rod 5 from being separated from the upper connecting rod 8 during telescoping, and it can also prevent the lower connecting rod 5 from rotating with the upper connecting rod 8. The top of the upper connecting rod 8 is fixedly connected with an arc clip 16, and the two ends of the outer side of the arc clip 16 are fixedly connected with connecting plates 17. The arc clip The materials of 16 and the connecting plate 17 are both nickel-titanium alloy, which has good shape memory and elasticity and can return to its original shape after deformation. A screw 10 is arranged between the connecting plates 17, and both ends of the screw 10 pass through the outer sides of the connecting plates 17 on both sides. One end of the hexagonal nut of the screw 10 is fixedly connected to one side of the connecting plate 17, and the surface of the other end of the screw 10 is slidably connected to the inner wall of the connecting plate 17 on the other side. A quick release mechanism 9 is arranged on the surface of the screw 10. The quick release mechanism 9 is used in conjunction with the screw 10 to shorten the distance between the connecting plates 17 and reduce the inner diameter of the arc card 16. When in use, the holding rod under the measuring instrument body 13 is placed inside the arc card 16 to achieve the effect of fitting and clamping the holding rod, thereby achieving the measurement. The instrument body 13 is clamped and fixed. Compared with the traditional method that requires the staff to hold the measuring instrument body 13 and walk around to measure, it can effectively reduce the burden on the staff's arm muscles, thereby reducing the staff's fatigue and improving the measurement work efficiency. The inner wall of the arc clamp 16 is provided with a rubber pad 19, and the rubber pad 19 can increase the friction between the arc clamp 16 and the measuring instrument body 13, thereby improving the stability of the clamping and fixing of the measuring instrument body 13. A telescopic mechanism 7 is provided between the lower connecting rod 5 and the upper connecting rod 8. The telescopic mechanism 7 can telescopically adjust the distance between the upper connecting rod 8 and the lower connecting rod 5, thereby achieving the effect of adjusting the height of the measuring instrument body 13, which can flexibly adapt to different height requirements in different measurement environments.It ensures that the measuring instrument body 13 can adapt to measuring objects of different heights, thereby providing more accurate and reliable measurement results. Moreover, after adjusting the height of the measuring instrument body 13, it is also convenient for users of different heights to operate the quick release mechanism 9, and it is convenient to disassemble and assemble the measuring instrument body 13. An adjustment mechanism 6 is provided on the surface of the mounting plate 2 and on one side of the support plate 3. The adjustment mechanism 6 cooperates with the rotating shaft 4 to adjust the angle of the lower connecting rod 5, so that the tilt distance between the measuring instrument body 13 and the user can also be adjusted. When in use, the tilt distance of the measuring instrument body 13 can be flexibly adjusted according to the height and body shape of the user, so that the user can maintain a comfortable posture when using the device, improve the comfort of use and the sustainability of long-term use.

[0031] The quick release mechanism 9 includes a fixed sleeve 91, the inner wall of which is threadedly connected to the surface of the screw rod 10, one side of the surface of the fixed sleeve 91 is fixedly connected to two limit rings 97, the two limit rings 97 are respectively slidably connected to the two sides of the connecting plate 17, and can effectively contact the connecting plate 17 on one side, the surface of the fixed sleeve 91 is fixedly connected to the limit strips 93, the number of the limit strips 93 is several, and they are distributed in a ring array at the center of the fixed sleeve 91, the surface of the fixed sleeve 91 is slidably connected to the rotating ring 92, the inner wall of the rotating ring 92 is provided with a limit groove 94, and the limit groove 94 is connected to the The number and shape of the clamping columns 95 are matched, and they are slidably connected to each other. When the staff rotates the rotating ring 92 by hand, the fixing sleeve 91 can be driven to rotate synchronously through the cooperation of the limiting strip 93 and the limiting groove 94, so that the fixing sleeve 91 moves on the surface of the screw 10. When the limiting ring 97 pushes the connecting plate 17 on one side, the distance between the two connecting plates 17 can be changed, and the connecting plate 17 can drive one end of the arc clamp 16 to move, thereby changing the diameter of the arc clamp 16, so that the arc clamp 16 can clamp the holding rod of the measuring instrument body 13 or remove it. Compared with the staff holding the measuring instrument body 13 and walking around to measure, the staff's arm burden can be reduced, thereby improving the measurement efficiency and reducing the staff's fatigue. A clamping column 95 is fixedly connected to one side of the rotating ring 92. The number of the clamping columns 95 is several and is distributed in a ring array at the center of the rotating ring 92. A locking hole 96 is opened on the side of the connecting plate 17 close to the rotating ring 92. The number and shape of the clamping columns 95 match the locking holes 96, and they are slidably connected to each other. When the rotating ring 92 slides on the surface of the fixed sleeve 91, the clamping columns 95 are When the clamping column 95 is inserted into the locking hole 96, the rotation of the rotating ring 92 can be limited, so that the fixing sleeve 91 will not rotate accidentally on the surface of the screw 10, thereby improving the stability of the arc clamp 16 clamping the measuring instrument body 13. The inner wall of the connecting plate 17 is embedded with a magnet ring 18. The material of the clamping column 95 is a nickel-iron alloy. When the clamping column 95 is inserted into the locking hole 96, the magnet ring 18 and the clamping column 95 are attracted to each other by magnetic force. When in use, the clamping column 95 will not easily escape from the locking hole 96, thereby further improving the stability of clamping the measuring instrument body 13.

[0032] The telescopic mechanism 7 includes a movable sleeve 71, which is located between the lower connecting rod 5 and the upper connecting rod 8. The surface of the movable sleeve 71 is provided with anti-skid patterns to enhance the friction between the sleeve and the hand, so that the staff can rotate it conveniently. The surface of the lower connecting rod 5 is provided with a threaded section 72, and the inner wall of the movable sleeve 71 is provided with a threaded groove 73. The specifications of the threaded section 72 and the threaded groove 73 match, and the threads therebetween are meshed with each other. The surface of the upper connecting rod 8 is provided with an annular groove 74, and the top of the inner wall of the movable sleeve 71 is fixedly connected with a snap ring 75, and the snap ring 75 is slidably connected to the annular groove 74. When the movable sleeve 71 is rotated in use, the threaded connection between the threaded section 72 and the threaded groove 73 can make the movable sleeve 71 on the lower connecting rod 5 , at which time the clamping ring 75 will drive the upper connecting rod 8 to rise and fall through the annular groove 74, so that the spacing between the upper connecting rod 8 and the lower connecting rod 5 can be changed, so that the upper connecting rod 8 drives the measuring instrument body 13 to rise or fall through the arc clamp 16 and the quick release mechanism 9, and the height of the measuring instrument body 13 can be adjusted accordingly, which can flexibly adapt to different height requirements and ensure that the measuring instrument body 13 can adapt to measurement objects of different heights and provide accurate and reliable measurement results, and it is also convenient for users of different heights to operate the quick release mechanism 9, so as to facilitate the disassembly and assembly of the measuring instrument body 13, and under the restriction of the shape of the connecting rod 15 and the accommodating cavity 14, it can prevent the upper connecting rod 8 from rotating with the lower connecting rod 5 when it is lifted or lowered.

[0033] The adjustment mechanism 6 includes a support shell 61, which is located on one side of the connecting plate 17. The support shell 61 is bolted to the surface of the mounting plate 2. One end of the rotating shaft 4 extends into the inner cavity of the supporting shell 61. One end of the rotating shaft 4 is rotatably connected to the inner wall of the supporting shell 61 through a bearing. A worm wheel 62 is bolted to the surface of the rotating shaft 4. A worm 63 is meshedly connected to one side of the worm wheel 62. The bottom end of the worm 63 is rotatably connected to the bottom of the inner wall of the supporting shell 61. The top end of the worm 63 penetrates to the top of the supporting shell 61 and is rotatably connected to the penetration point through a bearing. A handle is fixedly connected to the top of the worm 63. By rotating the handle of the worm 63, the worm 63 can be meshed with the worm wheel 62. Rotate, so that the worm wheel 62 drives the rotating shaft 4 and the lower connecting rod 5 to rotate, thereby the inclination angle of the lower connecting rod 5 can be changed, and then the inclination angle and distance between the measuring instrument body 13 and the user can be adjusted, the meshing connection between the worm wheel 62 and the worm 63 has good self-locking property, so that the lower connecting rod 5 will not change accidentally after the angle is adjusted, and the inclination angle and distance of the measuring instrument body 13 can be adjusted accordingly according to the height and body shape of the staff during use, so that the staff can maintain a more comfortable posture when using the device, which can reduce the burden on the body and reduce unnecessary muscle fatigue, and can also improve the flexibility and versatility of the device.

[0034] It is worth noting that the measuring instrument body 13 proposed in this technical solution is a three-dimensional laser scanner in the prior art, which can measure the height, diameter and other aspects of forestry trees through laser scanning. The working principle and beneficial effects when used will not be elaborated here.

[0035] Working principle: first, wrap the two ends of the belt 1 around the waist of the staff, then glue the Velcro velvet surface 11 and the Velcro hook surface 12 to make the belt 1 tight around the waist of the staff, then place the holding rod of the measuring instrument body 13 in the arc clamp 16, and then rotate the rotating ring 92. With the cooperation of the limiting strip 93 and the limiting groove 94, the fixing sleeve 91 can be driven to rotate and move on the surface of the screw 10. With the push of the connecting plate 17 by the limiting ring 97, the connecting plate 17 can drive one end of the arc clamp 16 to move, thereby shortening the diameter of the arc clamp 16 to clamp and fix the holding rod of the measuring instrument body 13, which can reduce the labor burden of the staff and improve the measurement efficiency. At the same time, when the height of the measuring instrument body 13 needs to be adjusted, first rotate the moving sleeve 71 between the threaded section 72 and the threaded groove 73 When the movable sleeve 71 is connected with the groove, the movable sleeve 71 can be moved on the surface of the lower connecting rod 5. At this time, the distance between the upper connecting rod 8 and the lower connecting rod 5 can be changed through the sliding connection between the retaining ring 75 and the annular groove 74, so that the measuring instrument body 13 can be driven to rise and fall, and can flexibly adapt to the measurement requirements of different heights. Finally, when it is necessary to adjust the inclination distance between the measuring instrument body 13 and the staff, first turn the handle of the worm 63 to make it mesh with the worm wheel 62, so that the worm wheel 62 drives the rotating shaft 4 and the lower connecting rod 5 to rotate, and thus the inclination angle of the lower connecting rod 5 can be changed. The meshing connection between the worm wheel 62 and the worm 63 has a self-locking effect, so that the measuring instrument body 13 will not be easily changed after adjustment, so that the staff can maintain a comfortable posture when using the device.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A forestry field measuring instrument, comprising a waist belt (1), a measuring instrument body (13), and a Velcro velvet surface (11) arranged on the inner side of the waist belt (1), characterized in that: Also includes: A Velcro hook surface (12) is arranged on the outside of the waist belt (1), a mounting plate (2) is bolted to the surface of the waist belt (1), two places on one side of the mounting plate (2) are bolted to support plates (3), and a rotating shaft (4) is rotatably connected between the support plates (3); A lower connecting rod (5) is fixedly connected to the surface of the rotating shaft (4), a receiving cavity (14) is provided at the top of the lower connecting rod (5), a connecting rod (15) is slidably connected to the inner wall of the receiving cavity (14), and an upper connecting rod (8) is fixedly connected to the top of the connecting rod (15); An arc-shaped clamp (16) is fixedly connected to the top of the upper connecting rod (8), both ends of the arc-shaped clamp (16) are fixedly connected to connecting plates (17), a screw rod (10) is arranged between the connecting plates (17), and a quick-release mechanism (9) is arranged on the surface of the screw rod (10); A telescopic mechanism (7) is used to adjust the distance between the lower connecting rod (5) and the upper connecting rod (8); the surface of the mounting plate (2) is provided with an adjusting mechanism (6), and the adjusting mechanism (6) is used in conjunction with the rotating shaft (4).

2. A forestry field measuring instrument according to claim 1, characterized in that: The quick-release mechanism (9) comprises a fixing sleeve (91) threadedly connected to the surface of the screw rod (10) and a limiting ring (97) fixedly connected to one side of the surface of the fixing sleeve (91); the limiting rings (97) are two in number and are respectively slidably connected to the two sides of the connecting plate (17); the surface of the fixing sleeve (91) is fixedly connected to a limiting strip (93); the limiting strips (93) are several in number and are distributed in a ring array at the center of the fixing sleeve (91); the surface of the fixing sleeve (91) is slidably connected to a rotating ring (92), a limiting groove (94) is provided on the inner wall of the rotating ring (92), the limiting grooves (94) correspond to the number of the clamping columns (95) and are slidably connected to each other, a clamping column (95) is fixedly connected to one side of the rotating ring (92), the number of the clamping columns (95) is several and is distributed in a ring array at the center of the rotating ring (92), a locking hole (96) is provided on one side of the connecting plate (17), the number of the clamping columns (95) and the locking holes (96) match each other and are slidably connected to each other.

3. A forestry field measuring instrument according to claim 1, characterized in that: The telescopic mechanism (7) comprises a movable sleeve (71) arranged between a lower connecting rod (5) and an upper connecting rod (8) and a threaded section (72) arranged on the surface of the lower connecting rod (5); a threaded groove (73) is provided on the inner wall of the movable sleeve (71); the threaded section (72) and the threaded groove (73) are threadedly connected; an annular groove (74) is provided on the surface of the upper connecting rod (8); a snap ring (75) is fixedly connected to the top of the inner wall of the movable sleeve (71); and the snap ring (75) is slidably connected to the annular groove (74).

4. A forestry field measuring instrument according to claim 1, characterized in that: The adjustment mechanism (6) comprises a support shell (61) bolted to the surface of the mounting plate (2) and a worm wheel (62) bolted to the surface of the rotating shaft (4), and one side of the worm wheel (62) is meshingly connected with a worm (63).

5. A forestry field measuring instrument according to claim 1, characterized in that: The cross-sectional shape of the inner cavity of the accommodating cavity (14) is rectangular, and the connecting rod (15) matches the shape of the accommodating cavity (14).

6. A forestry field measuring instrument according to claim 1, characterized in that: The inner wall of the arc-shaped clamp (16) is provided with a rubber pad (19).

7. A forestry field measuring instrument according to claim 2, characterized in that: A magnet ring (18) is embedded in the inner wall of the connecting plate (17), and the clamping column (95) is made of nickel-iron alloy.

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