CN107300381B - Laser calibration device for loading compass - Google Patents

Abstract

The invention discloses a laser calibration device for loading a compass, which comprises a supporting frame, wherein a rotatable tray seat is arranged on the supporting frame, a transverse marking and a longitudinal marking which are vertically crossed are fixed at the top of the tray seat, the intersection point of the transverse marking and the longitudinal marking is aligned with the axis of the tray seat, an installation position for placing the compass is formed at the top of the tray seat, the installation position is positioned below the transverse marking and the longitudinal marking, two transverse laser transmitters and two longitudinal laser transmitters are arranged at the side part of the tray seat, laser beams emitted by the two transverse laser transmitters are respectively aligned with extension lines of two ends of the transverse marking, and laser beams emitted by the two longitudinal laser transmitters are respectively aligned with the extension lines of two ends of the longitudinal marking. The invention can quickly adjust to the calibration direction without depending on visual inspection, and can simultaneously utilize the laser beam to indicate the direction, thereby not only reducing the deviation caused by visual inspection, but also greatly improving the surveying accuracy.

Description

Laser calibration device for loading compass

Technical Field

The invention relates to compass bearing and operating equipment, in particular to a laser calibration device for loading a compass.

Background

The compass is an instrument for geographical survey, and in the application process, the compass needs to be placed on a stable supporting frame to accurately observe data, and for this, supporting equipment similar to a tripod of a camera appears on the market and is used for playing the role of auxiliary support, but the existing supporting equipment only has the roles of placement and support, and in the actual application process, the following defects still exist:

1. after the compass is placed on the support frame, the compass is required to be adjusted to a calibration position by means of visual inspection, reference objects and the like, for example, the accurate survey can be realized only after the reference azimuth is calibrated, but the visual inspection mode has the defects of large visual deviation, multiple people are required to coordinate operation, low efficiency, poor survey accuracy and the like;

2. in order to fix the compass at a preset position, the existing support frame is usually provided with a compass clamp, a positioning hole, a mounting hole and other structures, but the structures can only be used for mounting a single type of compass, and clamping is difficult to realize for various compasses on the market, so that the compatibility of the compasses is insufficient;

3. when the compass is placed on the support frame, the compass is required to be adjusted to be in a horizontal state, the existing method is to use a level ruler as a reference, and simultaneously adjust the stretching length of the tripod, however, the method is low in efficiency and difficult to accurately level;

4. when the compass is required to be calibrated, the compass is usually driven to rotate by a handle or a hand push mode, the stroke of the adjustment mode is completely dependent on the thrust of a user, the adjustment mode is single, and the compass is difficult to adjust to a specified direction;

5. when the compass is used for calibrating the transverse and longitudinal lines and the compass is not moving, and the marking lines are required to be additionally arranged in any angle direction, two people are required to take one end of the marking line to stand in the direction of the center of the compass, and the middle person can watch the marking line to guide the two people taking the marking line to rotate around the center for orienting the marking lines.

Due to the defects, the existing compass auxiliary equipment cannot fully play a role, and inconvenience is brought to the use process of a user.

Disclosure of Invention

The invention aims to solve the technical problems of the prior art, and provides the laser calibration device for the loading compass, which can be quickly adjusted to the calibration direction without depending on visual inspection, and can utilize the laser beam to indicate the direction, so that the deviation caused by visual inspection is reduced, the surveying accuracy is greatly improved, and in addition, the device can be operated by only one person without being matched by a plurality of persons, thereby effectively saving the manpower.

In order to solve the technical problems, the invention adopts the following technical scheme.

The utility model provides a laser calibration device for loading compass, it is including the support frame, be equipped with rotatable dish seat on the support frame, the top of dish seat is fixed with perpendicular crisscross horizontal marking and vertical marking, the intersection of horizontal marking and vertical marking aligns with the axle center of dish seat, the top of dish seat is formed with the installation position that is used for placing the compass, just the installation position is located the below of horizontal marking and vertical marking, two horizontal laser emitter and two vertical laser emitter are installed to the lateral part of dish seat, and the laser beam of two horizontal laser emitter outgoing respectively with the extension line parallel and level at horizontal marking both ends, the laser beam of two vertical laser emitter outgoing respectively with the extension line parallel and level at vertical marking both ends.

Preferably, four sliding blocks are arranged on the tray seat, four sliding grooves are formed in the tray seat corresponding to the sliding blocks, the four sliding grooves are formed in the periphery of the installation position, the sliding grooves extend along the radial direction of the tray seat, the sliding blocks are clamped in the sliding grooves and are connected with the sliding blocks in a sliding manner, the transverse marking is fixed between the two sliding blocks, and the longitudinal marking is fixed between the other two sliding blocks.

Preferably, the below of dish seat is equipped with the carousel, just the carousel rotates with the dish seat to be connected, the lateral part of carousel is fixed with two lugs, the lug upwards extends by the outside of dish seat, and the top of two lugs is fixed with an angle marking, the angle marking is located the top of horizontal marking and vertical marking, just the intermediate point of angle marking with the intersection point of horizontal marking and vertical marking aligns, angle laser emitter is installed to the lateral part of lug, and the laser beam of two angle laser emitter outgoing respectively with the extension line parallel and level at angle marking both ends.

Preferably, a bottom shaft is formed at the axis of the bottom of the tray seat, a sleeve is formed at the axis of the top of the turntable, and the bottom shaft penetrates through the sleeve and is rotationally connected with the sleeve.

Preferably, the top of support frame wears to be equipped with the main shaft, just the main shaft with the support frame rotates to be connected, the top of main shaft is equipped with the joint seat, be fixed with the joint on the joint seat, the top of joint with dish seat fixed connection.

Preferably, the lower end of the bottom shaft is provided with a polygonal notch, the top end of the joint protrudes upwards to form a polygonal protrusion, the polygonal protrusion is clamped in the polygonal notch, a locking screw is arranged at the axis of the tray seat in a penetrating way, and the lower end of the locking screw is screwed with the polygonal protrusion.

Preferably, the power end of the transverse laser transmitter and the power end of the longitudinal laser transmitter are electrically connected to the two first contacts through leads, the two first contacts are located in the polygonal notch, the two first annular contacts are attached to the top of the polygonal protrusion, the two first annular contacts are concentric and different in diameter, the first contacts are in one-to-one abutting connection with the first annular contacts, and the transverse laser transmitter and the longitudinal laser transmitter are electrified by loading voltage to the two first annular contacts.

Preferably, the power end of the angle laser transmitter is electrically connected to two second contacts through a lead wire, the second contacts are arranged at the bottom of the turntable, two second annular contact pieces are attached to the top of the connector, the two second annular contact pieces are concentric and have different diameters, the second annular contact pieces encircle the polygonal protrusion, the second contacts are in one-to-one abutting connection with the second annular contact pieces, and the angle laser transmitter is electrified by loading voltage to the two second annular contact pieces.

Preferably, a battery box is arranged in the main shaft, a battery clamp is arranged in the battery box, a battery is clamped on the battery clamp, and electric energy output by the battery is transmitted to the two first annular contact pieces and/or the two second annular contact pieces.

Preferably, the circuit board is arranged in the connector base in a clamping manner, a plurality of button switches are arranged on the circuit board, the button switches penetrate through the connector base, the first annular contact piece, the second annular contact piece and the battery are respectively and electrically connected to the circuit board through leads, and the button switches are used for controlling the power-on states of the first annular contact piece and the second annular contact piece.

In the laser calibration device for loading the compass, when the compass is placed in an installation position, the compass is aligned by aligning the center of the compass with the intersection point of the transverse marking and the longitudinal marking, and when the laser calibration device is used, laser emitted by the two transverse laser transmitters and the two longitudinal laser transmitters can be used as extension lines of the transverse marking and the longitudinal marking, so that the rotating position of the tray seat can be adjusted by referring to the pointing direction of the laser beams until the compass is accurately positioned, and meanwhile, the extension lines of the laser transmitters and the angle marking are used for positioning the compass accurately at any angle on the transverse longitudinal positioning reference. Based on the above process, the compass can survey under the calibration condition, compared with the prior art, the invention greatly improves the calibration accuracy, can quickly adjust to the calibration direction without depending on visual inspection, and can simultaneously utilize the laser beam to indicate the direction, thereby not only reducing the deviation caused by visual inspection, but also greatly improving the survey accuracy.

Drawings

Fig. 1 is a perspective view of a laser calibration device for a loading compass of the present invention.

Fig. 2 is an enlarged view of a portion of the laser calibration device for a loading compass of fig. 1.

Fig. 3 is a partially exploded view of the laser calibration device for a loading compass of the present invention.

Fig. 4 is a side cross-sectional view of a laser calibration device for a loading compass of the present invention.

Fig. 5 is a partially exploded view of the laser calibration device for a loading compass of the present invention.

Fig. 6 is a structural diagram of the tray and the turntable.

Fig. 7 is a partially exploded view of the laser calibration device for a loading compass of the present invention.

Detailed Description

The invention is described in more detail below with reference to the drawings and examples.

The invention discloses a laser calibration device for loading a compass, which is shown in combination with fig. 1 to 7, and comprises a support frame 1, wherein a rotatable tray seat 2 is arranged on the support frame 1, a transverse marking 20 and a longitudinal marking 21 which are vertically crossed are fixed on the top of the tray seat 2, the intersection point of the transverse marking 20 and the longitudinal marking 21 is aligned with the axis of the tray seat 2, a mounting position 22 for placing the compass is formed on the top of the tray seat 2, the mounting position 22 is positioned below the transverse marking 20 and the longitudinal marking 21, two transverse laser transmitters 200 and two longitudinal laser transmitters 210 are arranged on the side part of the tray seat 2, laser beams emitted by the two transverse laser transmitters 200 are respectively aligned with extension lines of two ends of the transverse marking 20, and the laser beams emitted by the two longitudinal laser transmitters 210 are respectively aligned with extension lines of two ends of the longitudinal marking 21.

In the above-mentioned laser calibration device for loading a compass, when the compass is placed at the installation position 22, the alignment of the compass is achieved by aligning the center of the compass with the intersection point of the transverse marking 20 and the longitudinal marking 21, and when in use, the laser emitted from the two transverse laser emitters 200 and the two longitudinal laser emitters 210 can be used as the extension lines of the transverse marking 20 and the longitudinal marking 21, so that the rotating position of the disc seat 2 can be adjusted by referring to the direction of the laser beams until the compass is accurately positioned, and at the same time, any angle accurate marking positioning is performed on the transverse and longitudinal positioning references by using the extension lines of the turntable laser emitters and the angle marking. Based on the above process, the compass can survey under the calibration condition, compared with the prior art, the invention greatly improves the calibration accuracy, can quickly adjust to the calibration direction without depending on visual inspection, and can simultaneously utilize the laser beam to indicate the direction, thereby not only reducing the deviation caused by visual inspection, but also greatly improving the survey accuracy.

In order to solve the second problem in the prior art, that is, the problem of being applicable to compasses of multiple types, in this embodiment, as shown in fig. 1 to 3, four sliding blocks 23 are provided on the tray base 2, four sliding grooves 24 are provided on the tray base 2 corresponding to the sliding blocks 23, the four sliding grooves 24 are respectively provided around the mounting position 22, the sliding grooves 24 extend along the radial direction of the tray base 2, the sliding blocks 23 are clamped in the sliding grooves 24 and are slidably connected with the sliding grooves, the transverse marking 20 is fixed between the two sliding blocks 23, and the longitudinal marking 21 is fixed between the other two sliding blocks 23.

Wherein, under the effect of four sliders 23, can adjust the size of installation position 22, and then can place the compass of multiple size, horizontal marking 20 and vertical marking 21 accessible screw lock in this embodiment are on four sliders 23, in the adjustment process, can adjust the length of marking through elasticity, tight screw for the slider is behind the joint compass, and two marking homoenergetic reach the tensioning state.

After the compass is calibrated, in order to still play an indicating role in the surveying process, in this embodiment, the below of dish seat 2 is equipped with carousel 3, just carousel 3 rotates with dish seat 2 and is connected, the lateral part of carousel 3 is fixed with two lugs 30, lug 30 upwards extends by the outside of dish seat 2, and the top of two lugs 30 is fixed with angle marking 31, angle marking 31 is located the top of horizontal marking 20 and vertical marking 21, just the intermediate point of angle marking 31 with the intersection point of horizontal marking 20 and vertical marking 21 aligns, angle laser emitter 300 is installed to the lateral part of lug 30, and the laser beam that two angle laser emitters 300 export is parallel and level with the extension line at angle marking 31 both ends respectively.

As a preferable mode, a bottom shaft 25 is formed at the axis of the bottom of the tray 2, a sleeve 32 is formed at the axis of the top of the turntable 3, and the bottom shaft 25 is inserted into the sleeve 32 and is rotatably connected with the sleeve 32.

Regarding further structure, as shown in fig. 2 to 5, a spindle 10 is inserted through the top of the support frame 1, the spindle 10 is rotatably connected with the support frame 1, a joint seat 11 is disposed at the top end of the spindle 10, a joint 12 is fixed on the joint seat 11, and the top end of the joint 12 is fixedly connected with the disc seat 2.

In order to realize the rotation of the tray, referring to fig. 2, 3, 5 and 6, a polygonal recess 250 is formed at the lower end of the bottom shaft 25, the top end of the joint 12 protrudes upward to form a polygonal protrusion 120, the polygonal protrusion 120 is clamped in the polygonal recess 250, a locking screw 201 is disposed at the axial center of the tray 2, and the lower end of the locking screw 201 is screwed with the polygonal protrusion 120.

Regarding the power-taking part, the power end of the transverse laser transmitter 200 and the power end of the longitudinal laser transmitter 210 are electrically connected to the two first contacts 202 through leads, the two first contacts 202 are located in the polygonal recess 250, the two first annular contacts 121 are attached to the top of the polygonal protrusion 120, the two first annular contacts 121 are concentric and have different diameters, the first contacts 202 are in one-to-one abutting connection with the first annular contacts 121, and the transverse laser transmitter 200 and the longitudinal laser transmitter 210 are powered on by loading voltages to the two first annular contacts 121.

Further, the power end of the angle laser transmitter 300 is electrically connected to two second contacts 301 through a lead wire, the second contacts 301 are disposed at the bottom of the turntable 3, two second annular contacts 122 are attached to the top of the connector 12, the two second annular contacts 122 are concentric and have different diameters, the second annular contacts 122 encircle the polygonal protrusion 120, the second contacts 301 are in one-to-one abutting connection with the second annular contacts 122, and the angle laser transmitter 300 is powered on by loading voltage to the two second annular contacts 122.

In this embodiment, battery power is preferably supplied, specifically, a battery case 101 is disposed in the spindle 10, a battery holder 102 is disposed in the battery case 101, a battery 103 is clamped on the battery holder 102, and electric energy output by the battery 103 is transmitted to two first annular contacts 121 and/or two second annular contacts 122.

In order to control the power-on state of each laser, a circuit board 110 is clamped in the connector base 11, a plurality of push-button switches 111 are arranged on the circuit board 110, the push-button switches 111 are arranged on the connector base 11 in a penetrating manner, the first annular contact 121, the second annular contact 122 and the battery 103 are respectively and electrically connected to the circuit board 110 through leads, and the power-on state of the first annular contact 121 and the second annular contact 122 is controlled by the push-button switches 111.

In order to solve the third technical problem of the present invention, in this embodiment, as shown in fig. 2 and fig. 4 to fig. 7, a snap ring 4 is disposed at the top of the support frame 1, an inner cylinder 5 is disposed in the snap ring 4, an annular step portion 50 expanding outwards is formed at the upper end of the inner cylinder 5, the bottom of the annular step portion 50 abuts against the top end of the snap ring 4, a supporting ring 51 is disposed in the annular step portion 50, a movable ring 52 is disposed at the inner side of the supporting ring 51, a gap is disposed between the movable ring 52 and the supporting ring 51, two side shafts 53 are disposed at the outer side of the movable ring 52 and coaxially extend along the radial direction of the movable ring 52, the side shafts 53 are inserted into the inner side wall of the annular step portion 50 and rotatably connected with each other, a transverse shaft 54 is disposed in the movable ring 52, two ends of the transverse shaft 54 are respectively disposed in a penetrating manner and rotatably connected with each other, and the length direction of the transverse shaft 54 is perpendicular to the length direction of the side shafts 53, and the transverse shaft 54 is rotatably connected with the main shaft 10.

In the above structure, under the action of gravity, the spindle 10 can maintain the plumb state by the universal deflection action between the movable ring 52 and the supporting ring 51, and the disk seat 2 can also maintain the plumb state because the disk seat 2 is mounted on the top of the spindle 10. Further, a hanging weight 13 is hung at the lower end of the main shaft 10, so as to ensure that the main shaft 10 is always in a vertical state.

Preferably, an upper cover 6 is provided on the top of the inner cylinder 5, the upper cover 6 covers the outer side of the annular step 50, and the upper cover 6 is fixedly connected to the supporting ring 51. Further, the upper cover 6 and the supporting ring 51 are fixedly connected with the positioning column through positioning holes.

In order to solve the fourth technical problem of the present invention, in this embodiment, as shown in fig. 4 and 5, teeth 60 are formed on the outer side wall of the upper cover 6, a turnover member 40 is disposed on the snap ring 4, one end of the turnover member 40 is hinged to the snap ring 4, a stud 41 disposed transversely is clamped at the other end of the turnover member 40, the stud 41 is rotatably connected with the turnover member 40, when the turnover member 40 is turned outwards, the stud 41 is separated from the upper cover 6, and when the turnover member 40 is turned inwards, the external threads of the stud 41 are meshed with the teeth 60 on the outer side wall of the upper cover 6, and the upper cover 6 and the supporting ring 51 are driven to rotate by rotating the stud 41.

When the turnover piece 40 is turned outwards, the upper cover 6 can be manually rotated at the moment, the supporting ring 51, the movable ring 52, the transverse shaft 54, the main shaft 10 and the disc seat 2 are rotated together, so that coarse adjustment is carried out on the position of the disc seat 2, and when the turnover piece 40 is turned inwards by a user, the stud 41 is meshed with the outer side wall of the upper cover 6, the upper cover 6 can be driven to slowly rotate by the knob stud 41 at the moment, and then fine adjustment is carried out on the compass position placed on the disc seat 2.

In practical application, in order to apply force to the stud 41 conveniently, a knob 42 is disposed on the outer side of the turning member 40, the knob 42 is connected to the stud 41 through a key pin 43, and the stud 41 can be driven to rotate by rotating the knob 42.

In order to solve the fifth technical problem of the present invention, referring to fig. 3, in this embodiment, the turntable 3 is rotatably connected with the tray 2, two lugs 30 are fixed on the side of the turntable 3, the lugs 30 extend upward from the outer side of the tray 2, an angle marking 31 is fixed on the top ends of the two lugs 30, the angle marking 31 is located above the transverse marking 20 and the longitudinal marking 21, the middle point of the angle marking 31 is aligned with the intersection point of the transverse marking 20 and the longitudinal marking 21, an angle laser emitter 300 is mounted on the side of the lug 30, and the laser beams emitted by the two angle laser emitters 300 are respectively aligned with the extension lines of the two ends of the angle marking 31.

Wherein, when two angle laser emitter 300 outgoing lasers, these two laser beams can be regarded as the extension line at angle marking 31 both ends, and then play directional effect, and it is compared among the prior art and adopts the mode of artifical supplementary unwrapping wire, this embodiment is easier to use, observe to the accuracy is better.

The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, and modifications, equivalent substitutions or improvements made within the technical scope of the present invention should be included in the scope of the present invention.

Claims (3)

1. The utility model provides a laser calibration device for loading compass, its characterized in that includes support frame (1), be equipped with rotatable dish seat (2) on support frame (1), the top of dish seat (2) is fixed with perpendicular cross horizontal marking (20) and vertical marking (21), the intersection of horizontal marking (20) and vertical marking (21) aligns with the axle center of dish seat (2), the top of dish seat (2) is formed with installation position (22) that are used for placing the compass, just installation position (22) are located the below of horizontal marking (20) and vertical marking (21), two horizontal laser emitter (200) and two vertical laser emitter (210) are installed to the lateral part of dish seat (2), and the laser beam that two horizontal laser emitter (200) were emergent is parallel and level with the extension line at both ends of horizontal marking (20) respectively, and the laser beam that two vertical laser emitter (210) were emergent is parallel and level with the extension line at both ends of vertical marking (21) respectively;

four sliding blocks (23) are arranged on the tray seat (2), four sliding grooves (24) are formed in the tray seat (2) corresponding to the sliding blocks (23), the four sliding grooves (24) are respectively formed in the periphery of the installation position (22), the sliding grooves (24) extend along the radial direction of the tray seat (2), the sliding blocks (23) are clamped in the sliding grooves (24) and are in sliding connection with the sliding blocks, the transverse marking (20) is fixed between the two sliding blocks (23), and the longitudinal marking (21) is fixed between the other two sliding blocks (23);

the laser device comprises a disc seat (2), and is characterized in that a turntable (3) is arranged below the disc seat (2), the turntable (3) is rotationally connected with the disc seat (2), two lugs (30) are fixed on the side part of the turntable (3), the lugs (30) extend upwards from the outer side of the disc seat (2), angle marks (31) are fixed on the top ends of the two lugs (30), the angle marks (31) are positioned above the transverse marks (20) and the longitudinal marks (21), the middle points of the angle marks (31) are aligned with the crossing points of the transverse marks (20) and the longitudinal marks (21), angle laser transmitters (300) are mounted on the side parts of the lugs (30), and laser beams emitted by the two angle laser transmitters (300) are respectively aligned with extension lines at two ends of the angle marks (31);

a bottom shaft (25) is formed at the axis of the bottom of the disc seat (2), a sleeve (32) is formed at the axis of the top of the rotary disc (3), and the bottom shaft (25) penetrates through the sleeve (32) and is rotationally connected with the sleeve;

a main shaft (10) is arranged on the top of the support frame (1) in a penetrating way, the main shaft (10) is rotationally connected with the support frame (1), a joint seat (11) is arranged at the top end of the main shaft (10), a joint (12) is fixed on the joint seat (11), and the top end of the joint (12) is fixedly connected with the disc seat (2);

the lower end of the bottom shaft (25) is provided with a polygonal notch (250), the top end of the joint (12) protrudes upwards to form a polygonal protrusion (120), the polygonal protrusion (120) is clamped in the polygonal notch (250), a locking screw (201) is arranged at the axis of the tray seat (2) in a penetrating way, and the lower end of the locking screw (201) is screwed with the polygonal protrusion (120);

the power ends of the transverse laser transmitter (200) and the longitudinal laser transmitter (210) are electrically connected to two first contacts (202) through leads, the two first contacts (202) are positioned in a polygonal notch (250), two first annular contact pieces (121) are attached to the top of the polygonal protrusion (120), the two first annular contact pieces (121) are concentric and have different diameters, the first contacts (202) are in one-to-one abutting connection with the first annular contact pieces (121), and the transverse laser transmitter (200) and the longitudinal laser transmitter (210) are electrified by loading voltage to the two first annular contact pieces (121);

the power end of the angle laser transmitter (300) is electrically connected with two second contacts (301) through leads, the second contacts (301) are arranged at the bottom of the turntable (3), two second annular contacts (122) are attached to the top of the joint (12), the two second annular contacts (122) are concentric and have different diameters, the second annular contacts (122) encircle the polygonal protrusion (120), the second contacts (301) are in one-to-one abutting connection with the second annular contacts (122), and the angle laser transmitter (300) is electrified by loading voltage to the two second annular contacts (122);

the outer side wall of the upper cover (6) is provided with teeth (60), the snap ring (4) is provided with a turnover piece (40), one end of the turnover piece (40) is hinged with the snap ring (4), the other end of the turnover piece (40) is provided with a transverse stud (41) in a clamping mode, the stud (41) is rotationally connected with the turnover piece (40), when the turnover piece (40) is turned outwards, the stud (41) is separated from the upper cover (6), when the turnover piece (40) is turned inwards, external threads of the stud (41) are meshed with the teeth (60) on the outer side wall of the upper cover (6), and the upper cover (6) and the supporting ring (51) are driven to rotate through the rotary stud (41).

2. The laser calibration device for loading a compass according to claim 1, wherein a battery box (101) is arranged in the spindle (10), a battery clamp (102) is arranged in the battery box (101), a battery (103) is clamped on the battery clamp (102), and electric energy output by the battery (103) is transmitted to two first annular contact pieces (121) and/or two second annular contact pieces (122).

3. The laser calibration device for loading a compass according to claim 2, wherein the connector base (11) is internally provided with a circuit board (110), the circuit board (110) is provided with a plurality of button switches (111), the button switches (111) are arranged on the connector base (11) in a penetrating manner, the first annular contact (121), the second annular contact (122) and the battery (103) are respectively and electrically connected to the circuit board (110) through leads, and the power-on states of the first annular contact (121) and the second annular contact (122) are controlled by the button switches (111).