CN112414604A

CN112414604A - Torque measuring device based on motor-driven steering

Info

Publication number: CN112414604A
Application number: CN202011404010.3A
Authority: CN
Inventors: 张雪梅
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-03
Filing date: 2020-12-03
Publication date: 2021-02-26

Abstract

The invention provides a torque measuring device based on motor-driven steering, relates to the technical field of steering torque measurement, and solves the problems that when a plug and a torque sensor interface are loosened and are not completely separated, the steering torque input to a steering wheel driver is measured and is not influenced, but in a half-separated state, an operator cannot timely know to re-reinforce and install the steering wheel driver, and hidden danger exists. A torque measuring device based on motor-driven steering comprises a torque sensor, wherein a square pressing plate is slidably mounted at an interface part of the torque sensor. When the plug matched with the torque sensor interface is loosened from the torque sensor interface due to factors such as automobile vibration, the power supply inside the rectangular warning shell is in a connection state, and the buzzer makes a sound, so that the plug matched with the torque sensor interface is reminded of loosening in time and needs to be re-installed in time.

Description

Torque measuring device based on motor-driven steering

Technical Field

The invention belongs to the technical field of steering torque measurement, and particularly relates to a torque measuring device based on motor-driven steering.

Background

The motor-driven power steering apparatus refers to an apparatus for providing an assist torque in a driver's steering direction using a driving motor so as to make the operation lighter, and includes a torque sensor for measuring a steering torque input to a driver of a steering wheel; a steering angle sensor for measuring a steering angle of the steering wheel, and a vehicle speed sensor for measuring a vehicle speed.

For example, application No.: cn201210213299.x a device combining motor driven power steering with a compressor and a method of controlling the same. The apparatus for combining motor-driven power steering with a compressor may include: a reduction gear box connected to the steering shaft; an electric motor selectively providing a steering force to the reduction gear box; a first electronic clutch installed between the reduction gear box and the first shaft of the motor and transmitting or interrupting power transmission of the motor to the reduction gear box; a power transmission gear set transmitting power of the motor to a compressor; a second electronic clutch installed at a second shaft of the motor and an input side of the power transmission gear set and transmitting or interrupting power transmission of the motor to the power transmission gear set; and a compressor for an air conditioner connected to an output side of the power transmission gear set.

Based on the search of the above patent and the discovery of equipment in combination with the prior art, the plug matched with the torque sensor interface in the power steering device driven by the existing motor is very easy to loose due to factors such as automobile vibration and the like, and when the plug is not completely separated from the torque sensor interface, the plug measures the steering torque input to a steering wheel driver and is not influenced, but the plug is in a half-separated state, and an operator cannot timely know to reinforce and install the plug again, so that hidden danger exists.

Disclosure of Invention

In order to solve the technical problems, the invention provides a torque measuring device based on motor-driven steering, which aims to solve the problems that when a plug of a torque sensor matched with a torque sensor interface in the conventional motor-driven power steering device is easily loosened from the torque sensor interface due to factors such as automobile vibration and the like and is not completely separated, the steering torque input to a steering wheel driver is measured and is not influenced, but the semi-separated state causes that an operator cannot timely know to re-reinforce and install the steering wheel, and hidden dangers exist.

The invention relates to a torque measuring device based on motor-driven steering, which is realized by the following specific technical means:

a torque measuring device based on motor-driven steering comprises a torque sensor, wherein a square pressing plate is slidably mounted at an interface part of the torque sensor, and the square pressing plate is in plug-in fit with a rectangular pressing plate; a rectangular warning shell is embedded in the adjacent interface part of the top end face of the torque sensor, and a group of reset power supply cutting mechanisms which are in plug-in fit with the rectangular warning shell are arranged in the torque sensor corresponding to the part right below the rectangular warning shell; the rectangle warning casing link up the socket including the rectangle, bee calling organ, conducting block A, button cell, conducting block B and circuit spring, the inside bee calling organ that installs in proper order of rectangle warning casing, conducting block A, button cell, conducting block B and circuit spring, and conducting block A and conducting block B all are connected with bee calling organ pipe foot through the wire, under the ordinary extension state of circuit spring, conducting block A, button cell, conducting block B and circuit spring are in the state of contacting in proper order, a rectangle link up the socket has been seted up jointly for conducting block A and button cell contact site between rectangle warning casing top face and the bottom face.

Further, torque sensor is including cylindrical chamber, the embedded recess of rectangle through-hole and rectangle of accomodating, and the embedded recess of rectangle has been seted up at the adjacent interface position of torque sensor top face, and torque sensor is inside to be seted up a cylindrical chamber of accomodating corresponding to the embedded recess of rectangle under the position, the embedded recess bottom end face of rectangle is seted up a rectangle through-hole that is linked together with cylindrical chamber of accomodating.

Further, square clamp plate is including the circular port, the slip hole site, ball A and isosceles trapezoid recess, square clamp plate top end face central point has seted up a slip hole site, and the slip hole site diameter is greater than torque sensor interface external diameter, slip hole site internal periphery is that the annular array form is embedded to rotate altogether and installs eight ball A, square clamp plate top end face edge contained angle position all has seted up a circular port everywhere, square clamp plate bottom end face sets up the isosceles trapezoid recess that two places link up square clamp plate right-hand member face, under the installation, square clamp plate cup joints on torque sensor interface outer peripheral face through the circular port, and ball A and torque sensor interface outer peripheral face sliding contact, the round port everywhere is corresponding with the fastener position of torque sensor interface position.

Further, the rectangle clamp plate includes the limit slide bar, isosceles trapezoid piece, insulating inserted sheet A and copper conducting strip, the rectangle clamp plate left end is personally submitted the symmetry and is provided with two isosceles trapezoid pieces, rectangle clamp plate bottom face edge contained angle position all is provided with a limit slide bar everywhere, rectangle clamp plate bottom face middle part is provided with an insulating inserted sheet A, and the embedded copper conducting strip of installing on the insulating inserted sheet A, under the mounted state, two isosceles trapezoid pieces and two isosceles trapezoid recess grafting cooperation, and under isosceles trapezoid piece and the isosceles trapezoid recess grafting cooperation state, rectangle clamp plate bottom face and square clamp plate bottom face were in same horizontal plane.

Further, the rectangle warning casing is including reset spring A, circular spacing through-hole and ball B, rectangle warning casing top face four places edge contained angle position has all seted up a circular spacing through-hole, the adjacent open-top end position of every circular spacing through-hole inner peripheral surface all is the embedded rotation of annular array form and installs four ball B, rectangle warning casing top is personally submitted the symmetry form and has seted up two springs and accomodate the recess, and equal fixed mounting has a reset spring A in the recess is accomodate to two springs, under the installation condition, the embedded installation in the embedded recess of rectangle warning casing, the rectangle link up socket position is corresponding with the rectangle through-hole position, four spacing slide bars are pegged graft respectively in the circular spacing through-hole of four places, and spacing slide bar and ball B slide contact, insulating inserted sheet A is pegged graft in the rectangle link up socket.

Further, when the bottom end face of the rectangular pressing plate and the end face of the torque sensor interface part are positioned on the same horizontal plane, the reset spring A is in a compressed state, the conductive block A and the button battery are separated by the insulating insertion piece A, and the distance between the copper conductive sheets and the button battery is five millimeters.

Further, reset power supply shutdown mechanism is including reset spring B and insulating inserted sheet B, reset spring B top fixed mounting has an insulating inserted sheet B, under the installation status, reset spring B installs in cylindrical storage cavity, insulating inserted sheet B sliding connection is in the rectangle through-hole, under the ordinary extension state of reset spring B, insulating inserted sheet B is pegged graft and is separated conducting block A and button cell in the rectangle link up jack, under insulating inserted sheet A grafting state, insulating inserted sheet B top face contacts with insulating inserted sheet A bottom face, and insulating inserted sheet B top face and the embedded recess bottom face of rectangle are in same horizontal plane, and reset spring B is in compression state.

Compared with the prior art, the invention has the following beneficial effects:

when the plug matched with the torque sensor interface is loosened with the torque sensor interface due to factors such as automobile vibration, the plug is not limited, the reset spring A is reset quickly, the square pressing plate slides upwards along the outer peripheral face of the torque sensor interface through the ball A, the rectangular pressing plate is in sliding contact with the ball B through the limiting sliding rod to lift unimpeded, when the bottom end face of the rectangular pressing plate and the end face of the torque sensor interface are located on the same horizontal plane, the copper conducting plate is five millimeters away from the button battery, so when the rectangular pressing plate drives the insulating insertion sheet A to lift five millimeters, the copper conducting plate is in contact with the button battery, at the moment, the power supply inside the rectangular warning shell is in a connection state, and the buzzer makes a sound, so that the plug matched with the torque sensor interface is timely reminded of being loosened and needs to be installed again.

A group of reset power supply cutting mechanisms which are matched with the rectangular warning shell in an inserted mode are installed in the torque sensor corresponding to the position right below the rectangular warning shell, no insulating insertion piece A is inserted in the rectangular through socket through the reset power supply cutting mechanisms, the reset spring B is in a common extension state, the insulating insertion piece B is inserted in the rectangular through socket to separate the conductive block A from the button cell, and therefore the power supply in the rectangular warning shell can be always in a cut-off state.

Drawings

Fig. 1 is a schematic axial view of the present invention.

Fig. 2 is a schematic structural diagram of the square pressing plate, the rectangular warning shell and the reset power supply cutting mechanism in a disassembled state.

Fig. 3 is a schematic view of a partial cross-sectional enlarged structure of a rectangular warning housing according to the present invention.

Fig. 4 is a schematic structural view of the rectangular pressing plate, the rectangular warning case and the reset power cut-off mechanism in fig. 3 in a state where the rectangular pressing plate, the rectangular warning case and the reset power cut-off mechanism are removed.

FIG. 5 is a schematic view of a cross-sectional enlarged structure of a rectangular platen according to the present invention.

FIG. 6 is a schematic sectional view of the position of the limiting slide bar according to the present invention.

Fig. 7 is a schematic view of the present invention at a portion enlarged in fig. 6.

In the drawings, the corresponding relationship between the component names and the reference numbers is as follows:

1. a torque sensor; 101. a cylindrical receiving cavity; 102. a rectangular through hole; 103. a rectangular embedded groove; 2. a square pressing plate; 201. a circular hole; 202. a sliding hole position; 203. a ball A; 204. an isosceles trapezoid groove; 3. a rectangular pressing plate; 301. a limiting slide bar; 302. an isosceles trapezoid block; 303. an insulating insert A; 304. a copper conductive sheet; 4. a rectangular warning housing; 401. a rectangular through socket; 402. a return spring A; 403. a circular limiting through hole; 404. a ball B; 405. a buzzer; 406. a conductive block A; 407. a button cell; 408. a conductive block B; 409. a circuit spring; 5. a reset power supply cut-off mechanism; 501. a return spring B; 502. insulating inserted sheet B.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

As shown in figures 1 to 7:

the invention provides a torque measuring device based on motor-driven steering, comprising: a square pressing plate 2 is slidably mounted at the interface part of the torque sensor 1, and the square pressing plate 2 is in inserted fit with the rectangular pressing plate 3; a rectangular warning shell 4 is embedded in the adjacent interface part of the top end face of the torque sensor 1, and a group of reset power supply cutting mechanisms 5 which are in plug-in fit with the rectangular warning shell 4 are arranged in the torque sensor 1 corresponding to the part right below the rectangular warning shell 4; the rectangular warning shell 4 comprises a rectangular through socket 401, a buzzer 405, a conductive block A406, a button cell 407, a conductive block B408 and a circuit spring 409, the buzzer 405, the conductive block A406, the button cell 407, the conductive block B408 and the circuit spring 409 are sequentially installed inside the rectangular warning shell 4, the conductive block A406 and the conductive block B408 are connected with a base pin of the buzzer 405 through wires, the conductive block A406, the button cell 407, the conductive block B408 and the circuit spring 409 are in a sequential contact state under a common extension state of the circuit spring 409, and a rectangular through socket 401 is jointly formed between the top end face and the bottom end face of the rectangular warning shell 4 relative to a contact portion of the conductive block A406 and the button cell 407.

The torque sensor 1 comprises a cylindrical accommodating cavity 101, a rectangular through hole 102 and a rectangular embedded groove 103, the rectangular embedded groove 103 is formed in the position of an adjacent interface of the top end face of the torque sensor 1, the cylindrical accommodating cavity 101 is formed in the position, corresponding to the position below the rectangular embedded groove 103, in the torque sensor 1, and the rectangular through hole 102 communicated with the cylindrical accommodating cavity 101 is formed in the bottom end face of the rectangular embedded groove 103.

Wherein, square clamp plate 2 is including circular port 201, slip hole site 202, ball A203 and isosceles trapezoid recess 204, square clamp plate 2 top end face central point has seted up one and has slided hole site 202, and slide hole site 202 diameter is greater than torque sensor 1 interface external diameter, slide hole site 202 internal periphery is the annular array form and altogether embeds the rotation and install eight ball A203, square clamp plate 2 top end face edge contained angle position all has seted up one circular port 201 everywhere, square clamp plate 2 bottom end face sets up two isosceles trapezoid recess 204 that link up square clamp plate 2 right-hand member face, under the installation status, square clamp plate 2 cup joints on torque sensor 1 interface outer peripheral face through circular port 201, and ball A203 and torque sensor 1 interface outer peripheral face sliding contact, four circular ports 201 correspond with the fastener position at torque sensor 1 interface position.

Wherein, rectangular pressing plate 3 is including spacing slide bar 301, isosceles trapezoid piece 302, insulating inserted sheet A303 and

copper conducting strip

304, 3 left end faces of rectangular pressing plate are the symmetry form and are provided with two

isosceles trapezoid pieces

302, 3 bottom face of rectangular pressing plate all is provided with a spacing slide bar 301 in edge contained angle position everywhere, 3 bottom face middle part of rectangular pressing plate is provided with an insulating inserted sheet A303, and embedded installation has a copper conducting strip 304 on insulating inserted sheet A303, under the mounted state, two isosceles trapezoid pieces 302 and two isosceles trapezoid recess 204 cooperation of pegging graft, and isosceles trapezoid piece 302 and isosceles trapezoid recess 204 cooperation state of pegging graft, 3 bottom faces of rectangular pressing plate are in same horizontal plane with 2 bottom faces of square pressing plate.

Wherein, the rectangular warning shell 4 comprises a reset spring A402, a circular limiting through hole 403 and balls B404, the four edge included angles of the top end surface of the rectangular warning shell 4 are all provided with one circular limiting through hole 403, the adjacent top opening end part of the inner peripheral surface of each circular limiting through hole 403 is embedded with four balls B404 in an annular array shape in a rotating way, the top end surface of the rectangular warning shell 4 is symmetrically provided with two spring receiving grooves, and a return spring A402 is fixedly arranged in the spring accommodating grooves at two positions, and in the mounting state, the rectangular warning shell 4 is embedded and installed in the rectangular embedded groove 103, the rectangular through socket 401 corresponds to the rectangular through hole 102, four limit slide bars 301 are respectively inserted in four round limit through holes 403, and the limiting sliding rod 301 is in sliding contact with the ball B404, and the insulating insertion sheet A303 is inserted into the rectangular through insertion opening 401.

When the bottom end face of the rectangular pressing plate 3 and the end face of the interface part of the torque sensor 1 are positioned on the same horizontal plane, the return spring A402 is in a compressed state, the insulating insertion piece A303 separates the conductive block A406 from the button battery 407, and the distance between the copper conductive sheet 304 and the button battery 407 is five millimeters.

The reset power supply cutting mechanism 5 comprises a reset spring B501 and an insulating insertion sheet B502, an insulating insertion sheet B502 is fixedly mounted at the top end of the reset spring B501, in the mounting state, the reset spring B501 is mounted in the cylindrical receiving cavity 101, the insulating insertion sheet B502 is connected in the rectangular through hole 102 in a sliding mode, in the ordinary extension state of the reset spring B501, the insulating insertion sheet B502 is inserted into the rectangular through hole 401 to separate the conductive block A406 from the button cell 407, in the insertion state of the insulating insertion sheet A303, the top end face of the insulating insertion sheet B502 is in contact with the bottom end face of the insulating insertion sheet A303, the top end face of the insulating insertion sheet B502 and the bottom end face of the rectangular embedded groove 103 are in the same horizontal plane, and the reset spring.

When in use:

when a plug matched with an interface of the torque sensor 1 is in an installation state, the plug presses down the square pressing plate 2 to slide down along the peripheral surface of the interface of the torque sensor 1 through the ball A203 until the bottom end face of the square pressing plate 2 is contacted with the interface end of the torque sensor 1, and the square pressing plate 2 and the rectangular pressing plate 3 are installed through the matching of the isosceles trapezoid groove 204 and the isosceles trapezoid block 302, so that the square pressing plate 2 synchronously drives the rectangular pressing plate 3 to press down when sliding down, when the bottom end face of the rectangular pressing plate 3 and the end face of the interface part of the torque sensor 1 are positioned on the same horizontal plane, the reset spring A402 is in a compression state, the insulating inserting sheet A303 separates the conductive block A406 from the button battery 407, and at the moment, the power;

when the plug matched with the interface of the torque sensor 1 is loosened with the interface of the torque sensor 1 due to factors such as automobile vibration and the like, the reset spring A402 is reset rapidly without the limit of the plug, the square pressing plate 2 slides up along the outer peripheral surface of the interface of the torque sensor 1 through the ball A203, the rectangular pressing plate 3 is in sliding contact with the ball B404 through the limit slide rod 301 and rises without hindrance, because when the bottom end surface of the rectangular pressing plate 3 and the end surface of the interface part of the torque sensor 1 are positioned on the same horizontal plane, the distance between the copper conducting plate 304 and the button battery 407 is five millimeters, when the rectangular pressing plate 3 drives the insulating insertion piece A303 to rise five millimeters, the copper conducting plate 304 is in contact with the button battery 407, at the moment, the internal power supply of the rectangular warning shell 4 is in a connection state, the buzzer 405 makes a sound, thereby timely reminding that when the, reinstallation in time is needed;

a group of reset power supply cutting mechanisms 5 which are matched with the rectangular warning shell 4 in an inserted mode are installed in the torque sensor 1 corresponding to the position right below the rectangular warning shell 4, through the arrangement of the reset power supply cutting mechanisms 5, no insulating insertion sheet A303 is inserted in the state of a rectangular through socket 401, at the moment, a reset spring B501 is in a common extension state, and an insulating insertion sheet B502 is inserted in the rectangular through socket 401 to separate a conductive block A406 from a button cell 407, so that the power supply in the rectangular warning shell 4 can be always in a cut-off state.

The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. A torque measuring device based on motor-driven steering is characterized in that: the torque sensor comprises a torque sensor (1), wherein a square pressing plate (2) is slidably mounted at the interface part of the torque sensor (1), and the square pressing plate (2) is in plug-in fit with a rectangular pressing plate (3); a rectangular warning shell (4) is embedded in the adjacent interface part of the top end face of the torque sensor (1), and a group of reset power supply cutting mechanisms (5) which are in plug-in fit with the rectangular warning shell (4) are arranged in the torque sensor (1) corresponding to the part right below the rectangular warning shell; the rectangular warning shell (4) comprises a rectangular through socket (401), a buzzer (405), a conductive block A (406), a button cell (407), a conductive block B (408) and a circuit spring (409), the buzzer (405), the conductive block A (406), the button cell (407), the conductive block B (408) and the circuit spring (409) are sequentially arranged in the rectangular warning shell (4), and the conductive block A (406) and the conductive block B (408) are connected with the pin of the buzzer (405) through leads, under the normal extension state of the circuit spring (409), the conductive block A (406), the button cell (407), the conductive block B (408) and the circuit spring (409) are in a sequentially contacted state, and a rectangular through socket (401) is formed between the top end face and the bottom end face of the rectangular warning shell (4) and is opposite to the contact part of the conductive block A (406) and the button cell (407).

2. A torque measuring device based on motor-driven steering according to claim 1, wherein: the torque sensor (1) comprises a cylindrical accommodating cavity (101), a rectangular through hole (102) and a rectangular embedded groove (103), the rectangular embedded groove (103) is formed in the position of an adjacent interface of the top end face of the torque sensor (1), the cylindrical accommodating cavity (101) is formed in the position, corresponding to the position under the rectangular embedded groove (103), in the torque sensor (1), the rectangular through hole (102) communicated with the cylindrical accommodating cavity (101) is formed in the bottom end face of the rectangular embedded groove (103).

3. A torque measuring device based on motor-driven steering according to claim 1, wherein: the square pressing plate (2) comprises a circular hole (201), a sliding hole site (202), balls A (203) and isosceles trapezoid grooves (204), the center part of the top end face of the square pressing plate (2) is provided with one sliding hole site (202), the diameter of the sliding hole site (202) is larger than the outer diameter of an interface of the torque sensor (1), the inner circumference of the sliding hole site (202) is in an annular array shape, eight balls A (203) are rotatably embedded in the sliding hole site, the circular hole (201) is formed in the edge included angle part of the four positions of the top end face of the square pressing plate (2), the isosceles trapezoid grooves (204) penetrating through the right end face of the square pressing plate (2) are formed in the bottom end face of the square pressing plate (2), the square pressing plate (2) is sleeved on the outer circumferential face of the interface of the torque sensor (1) through the circular hole (201) in the installation state, the four circular holes (201) correspond to four fastener positions of the interface part of the torque sensor (1).

4. A torque measuring device based on motor-driven steering according to claim 1, wherein: rectangle clamp plate (3) are including limiting slide bar (301), isosceles trapezoid piece (302), insulating inserted sheet A (303) and copper conducting strip (304), rectangle clamp plate (3) left end face is the symmetry form and is provided with two isosceles trapezoid piece (302), rectangle clamp plate (3) bottom end face four edge contained angle positions all are provided with a limiting slide bar (301), rectangle clamp plate (3) bottom end face middle part is provided with an insulating inserted sheet A (303), and embedded installation has a copper conducting strip (304) on insulating inserted sheet A (303), under the installation state, two isosceles trapezoid piece (302) and two isosceles trapezoid recess (204) are pegged graft and are cooperated, and isosceles trapezoid piece (302) and isosceles trapezoid recess (204) are pegged graft under the cooperation state, rectangle clamp plate (3) bottom end face and square clamp plate (2) bottom end face are in same horizontal plane.

5. A torque measuring device based on motor-driven steering according to claim 1, wherein: the rectangular warning shell (4) comprises a return spring A (402), circular limiting through holes (403) and balls B (404), wherein the top end face of the rectangular warning shell (4) is provided with one circular limiting through hole (403) at each edge included angle, the adjacent top opening end part of the inner peripheral surface of each circular limiting through hole (403) is embedded with four balls B (404) in an annular array manner in a rotating manner, the top end face of the rectangular warning shell (4) is symmetrically provided with two spring accommodating grooves, the two spring accommodating grooves are fixedly provided with one return spring A (402), in the installation state, the rectangular warning shell (4) is embedded in the rectangular embedded groove (103), the rectangular through socket (401) is corresponding to the rectangular through hole (102), and four limiting slide rods (301) are respectively inserted in the circular limiting through holes (403), and the limiting sliding rod (301) is in sliding contact with the ball B (404), and the insulating insertion sheet A (303) is inserted into the rectangular through insertion opening (401).

6. A torque measuring device based on motor-driven steering according to claim 1, wherein: when the bottom end face of the rectangular pressing plate (3) and the end face of the interface part of the torque sensor (1) are positioned on the same horizontal plane, the reset spring A (402) is in a compressed state, the insulating insertion piece A (303) separates the conductive block A (406) from the button battery (407), and the distance between the copper conductive sheet (304) and the button battery (407) is five millimeters.

7. A torque measuring device based on motor-driven steering according to claim 1, wherein: the reset power supply cutting mechanism (5) comprises a reset spring B (501) and an insulating insertion sheet B (502), the top end of the reset spring B (501) is fixedly provided with the insulating insertion sheet B (502), and in the installation state, the return spring B (501) is arranged in the cylindrical containing cavity (101), the insulating insertion sheet B (502) is connected in the rectangular through hole (102) in a sliding way, and under the ordinary extension state of the return spring B (501), the insulating insertion sheet B (502) is inserted in the rectangular through insertion opening (401) to separate the conductive block A (406) from the button cell (407), and under the insertion state of the insulating insertion sheet A (303), the top end surface of the insulating insert B (502) is contacted with the bottom end surface of the insulating insert A (303), and the top end face of the insulating insertion sheet B (502) and the bottom end face of the rectangular embedded groove (103) are in the same horizontal plane, and the return spring B (501) is in a compressed state.