CN212872777U

CN212872777U - Fire-fighting weak current engineering safety detection device

Info

Publication number: CN212872777U
Application number: CN202022053231.2U
Authority: CN
Inventors: 刘强; 唐建之
Original assignee: Sichuan Jian'an Weiye Construction Engineering Co ltd
Current assignee: Sichuan Jian'an Weiye Construction Engineering Co ltd
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2021-04-02
Anticipated expiration: 2030-09-18

Abstract

The utility model relates to a fire control weak current engineering safety inspection device belongs to fire control safety inspection technical field, including the handwriting, be provided with the survey needle in the handwriting, the cavity has been seted up in the handwriting, the survey needle slides and sets up in the cavity, set up the opening that supplies the survey needle roll-off on the handwriting, the opening with the cavity intercommunication sets up, the survey needle slides along handwriting length direction, be provided with the regulating part that is used for driving the survey needle roll-off handwriting on the handwriting, the internal restoring piece that orders about the survey needle and return to the handwriting that is provided with of handwriting. When the circuit is detected, one end of the measuring pin slides out of the pen body through the adjusting piece, a worker holds the pen body to enable the measuring pin to contact the circuit to be detected, the circuit to be detected and the worker form a closed loop, and then the circuit is detected; after the circuit is detected, the measuring pin is automatically recovered into the pen body under the action of the recovery piece, and the operation is simple and practical.

Description

Fire-fighting weak current engineering safety detection device

Technical Field

The application relates to the technical field of fire safety detection, in particular to a fire-fighting weak current engineering safety detection device.

Background

In the fire-fighting weak current system, all circuits are basically weak current lines, so the system is generally called as 'fire-fighting weak current'. For weak current, it is generally understood that low voltage, i.e. less than 220 volts ac 50 hz, or less than 24 volts dc, is selected or understood as low current depending on the application; although the weak current voltage is not high, a human body can be damaged after contacting, so that the weak current detection is an essential link in a fire fighting system. In the weak current detection process, the test pencil is most commonly used, and is most favored because the test pencil has a small volume and is convenient to carry.

If the patent document with the publication number of CN211148732U discloses a fire-fighting engineering weak current safety detection device, which comprises an upper pen body, a lower pen body and a measuring needle, wherein the upper pen body is positioned above the lower pen body, the measuring needle is positioned in the lower pen body, the bottom of the upper pen body is fixedly provided with a threaded rod and a circular ring limiting plate, the threaded rod is positioned in the circular ring limiting plate, the lower pen body is vertically provided with an accommodating groove, the measuring needle is positioned in the accommodating groove, and the top of the accommodating groove is provided with a threaded sleeve in a sliding manner and is fixedly connected with the top of the measuring needle; when the test pencil is used, the annular limiting plate is clamped into the limiting annular groove, then when the test pencil is not used, the lower pencil body can be rotated, and the threaded sleeve cannot rotate along with the lower pencil body, so that the internal threads and the threaded rod rotate, the position of the threaded rod is unchanged, the threaded sleeve can move upwards, and the threaded sleeve can drive the probe to upwards retract into the accommodating groove; similarly, when the stylus needs to be released, the lower pen body is rotated reversely.

In view of the above-mentioned related art, the inventors considered that the probe needs to be rotated out when the above-mentioned apparatus detection circuit is used; after the pen is used, the pen body needs to be rotated to withdraw the measuring needle, so that the operation is inconvenient.

SUMMERY OF THE UTILITY MODEL

In order to facilitate the detection of circuit, the application provides a fire control light current engineering safety inspection device.

The application provides a fire control light current engineering safety inspection device adopts following technical scheme:

the utility model provides a fire control light current engineering safety inspection device, includes the handwriting, be provided with the test pin in the handwriting, the cavity has been seted up in the handwriting, the test pin slides and sets up in the cavity, set up the opening that supplies the test pin roll-off on the handwriting, the opening with the cavity intercommunication sets up, the test pin slides along handwriting length direction, be provided with the regulating part that is used for driving the test pin roll-off handwriting on the handwriting, be provided with in the handwriting and order about the test pin and return to the internal recovery piece of handwriting.

By adopting the technical scheme, when the circuit is detected, one end of the probe slides out of the pen body through the adjusting piece, a worker holds the pen body to enable the probe to contact the circuit to be detected, the circuit to be detected and the worker form a closed loop, and the circuit is detected; after the circuit is detected, the measuring pin is automatically recovered into the pen body under the action of the recovery piece, so that the operation is simple and practical; when the circuit is not required to be detected, the measuring pin is stored in the pen body, so that the possibility of rusting of the measuring pin caused by external factors is reduced, and the service life of the measuring pin is prolonged.

Preferably, the regulating part includes the grab handle of slip setting on the handwriting, the slip direction perpendicular to measuring pin's of grab handle slip direction, open-ended one end is kept away from to the measuring pin is provided with the butt head, the butt head with the grab handle butt sets up, the binding face of grab handle and butt head sets up towards the measuring pin slope, the distance between open-ended one end is kept away from to the grab handle and the measuring pin is less than the distance that the grab handle is close to between open-ended one end and the measuring pin.

Through adopting above-mentioned technical scheme, when ordering about the stylus roll-off handwriting, press the grab handle, the grab handle slides towards the handwriting, under the effect of the binding face of slope, converts the slip of grab handle into the slip of butt head, and then orders about the butt head and slides near open-ended direction towards, and the butt head slides and drives the stylus slip and the roll-off handwriting, and easy operation is practical.

Preferably, the restoring piece comprises a spring arranged between the abutting head and the pen body, one end of the spring is arranged on the abutting head, the other end of the spring is arranged on the side wall of the cavity, and the length direction of the spring is parallel to the sliding direction of the measuring needle.

Through adopting above-mentioned technical scheme, the stylus is at gliding in-process, and the spring is in tensile state, and under the effect of spring force, the butt head has the motion trend of returning to initial position, and then makes the stylus have the motion trend of returning to the pen body, need not the staff and accomodate the stylus to the pen body after the use in, has reduced staff's the amount of labour, uses manpower sparingly.

Preferably, the grab handle is rotatably provided with a roller, and the roller is arranged on the surface of the grab handle close to the abutting head.

Through adopting above-mentioned technical scheme, the setting of gyro wheel has reduced the frictional force between grab handle and the butt head the two, and then is convenient for the staff to press the grab handle and orders about the stylus roll-off pen body.

Preferably, the handle is provided with a through hole, the pen body is provided with an insertion rod in a sliding manner, and the insertion rod can be matched with the through hole in an inserting manner.

Through adopting above-mentioned technical scheme, need to treat that the detection line carries out the multiple spot and detects time measuring, press the grab handle for the test pin roll-off handwriting, after through-hole and inserted bar coaxial line, peg graft the inserted bar in the through-hole, and then fix the grab handle to required position, need not the staff and press the grab handle all the time, reduced staff's the amount of labour, use manpower sparingly.

Preferably, the measuring probe comprises a loop bar arranged on the abutting head and a sliding bar sleeved in the loop bar in a sliding manner, the length direction of the loop bar is perpendicular to the sliding direction of the grab handle, and a limiting piece used for limiting the sliding of the sliding bar is arranged on the loop bar.

Through adopting above-mentioned technical scheme, when the length of survey pin is adjusted in order to satisfy waiting to detect the circuit under the different scenes as needs, press the grab handle and make the survey pin roll-off handwriting and fix the grab handle to required position, slide bar afterwards, then fix the slide bar to required position under the effect of limiting piece, with the length that increases the survey pin, and then improved the application range of survey pin, need not the staff and trade other devices, reduced staff's the amount of labour and improved the detection efficiency to the circuit.

Preferably, the limiting piece comprises a threaded section arranged on the sliding rod, and a threaded groove in threaded fit with the threaded section is formed in the inner wall of the sleeve rod.

By adopting the technical scheme, when the length of the measuring probe needs to be increased, the sliding rod is rotated to slide out of the loop bar, so that the length of the measuring probe is increased, and the operation is simple and practical; the threaded connection has self-locking performance, when the length of the measuring needle is adjusted to a required position, the sliding rod is fixed to the required position, and a worker does not need to fix the sliding rod by other tools, so that the labor capacity of the worker is further reduced; and the loop bar and the sliding bar which are connected by the thread have the advantage of good limiting effect.

Preferably, the pen body is rotatably provided with a sealing plate for closing the opening, the rotating axis of the sealing plate is perpendicular to the sliding direction of the stylus, and the pen body is provided with an elastic piece for enabling the sealing plate to be flush with the plane where the opening is located.

By adopting the technical scheme, when the line is detected, the grab handle is pressed, so that the measuring pin slides out of the pen body, the end, far away from the abutting head, of the measuring pin pushes the sealing plate open, and then the measuring pin abuts against the wall to be detected; after the measuring pin is retracted into the pen body, the sealing plate is restored to the position flush with the plane where the opening is located under the action of the elastic piece, the possibility of external impurities in the cavity is reduced, and the measuring pin is protected to a certain extent.

Preferably, the pen body is provided with an articulated shaft in a rotating mode, the rotation axis of the articulated shaft is parallel to the rotation axis of the sealing plate, two ends of the articulated shaft are arranged on the side wall of the cavity, the articulated shaft is arranged at one end, away from the butt joint head, of the cavity, the elastic part comprises a torsional spring which is sleeved on the articulated shaft, one side of the torsional spring is arranged on the sealing plate, and the other side of the torsional spring is arranged on the side wall of the cavity.

By adopting the technical scheme, when the measuring pin slides out of the pen body, the measuring pin jacks the sealing plate, and meanwhile, the torsion spring is driven by the sealing plate to be twisted, so that the torsion spring generates torsion; when the stylus returns to the pen body, the sealing plate automatically returns to the required position under the action of torsional spring torsion, and then the opening is sealed, the staff is not required to rotate the sealing plate to seal the opening, and the labor capacity of the staff is reduced.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the circuit is detected, one end of the measuring pin slides out of the pen body through the adjusting piece, a worker holds the pen body to enable the measuring pin to contact the circuit to be detected, the circuit to be detected and the worker form a closed loop, and then the circuit is detected; after the circuit is detected, the measuring pin is automatically recovered into the pen body under the action of the recovery piece, so that the operation is simple and practical; when the circuit is not required to be detected, the measuring pin is accommodated in the pen body, so that the possibility of corrosion of the measuring pin caused by external factors is reduced, and the service life of the measuring pin is prolonged;

2. when the stylus is driven to slide out of the pen body, the grab handle is pressed, the grab handle slides towards the pen body, the sliding of the grab handle is converted into the sliding of the butt joint head under the action of the inclined binding surface, the butt joint head is driven to slide towards the direction close to the opening, the butt joint head slides to drive the stylus to slide and slide out of the pen body, and the operation is simple and practical;

3. the survey pin is at gliding in-process, and the spring is in tensile state, and under the effect of spring force, the butt head has the motion trend of returning to initial position, and then makes the survey pin have the motion trend of returning to in the pen body, need not the staff and accomodate the survey pin to the pen body after the use, has reduced staff's the amount of labour, uses manpower sparingly.

Drawings

FIG. 1 is a schematic diagram of the overall structure of one embodiment of the present application;

FIG. 2 is an enlarged schematic view of portion A of FIG. 1;

FIG. 3 is a cross-sectional view of one embodiment of the present application showing the internal structure of the pen body;

FIG. 4 is a cross-sectional view of a stylus according to an embodiment of the present application, showing a connection relationship between a loop bar and a slide bar.

Description of reference numerals: 1. a pen body; 2. measuring a needle; 21. a loop bar; 22. a slide bar; 3. a cavity; 4. an opening; 5. a handle; 6. a butting head; 7. a spring; 8. a roller; 9. a through hole; 10. inserting a rod; 11. a threaded segment; 12. a thread groove; 13. a sealing plate; 14. hinging a shaft; 15. a torsion spring; 16. and (6) erecting a rod.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

The embodiment of the application discloses light current engineering safety inspection device of fire control. Referring to fig. 1 and 3, a fire control weak current engineering safety inspection device, including the handwriting 1, be provided with the probe 2 in the handwriting 1, the probe 2 is flat mouthful of shape with the contact jaw of circuit, cavity 3 has been seted up in the handwriting 1, 3 cross-sections of cavity are the rectangle, the length direction that cavity 3 is on a parallel with handwriting 1 is long limit, cavity 3 is on a parallel with handwriting 1 width direction is the minor face, probe 2 slides and sets up in cavity 3, set up opening 4 that supplies the 2 roll-off of probe on the handwriting 1, opening 4 and 3 intercommunication settings of cavity, probe 2 slides along the length direction of handwriting 1, be provided with the regulating part that is used for driving probe 2 roll-off handwriting 1 on the handwriting 1, be provided with in the handwriting 1 and order about the reply piece that probe 2 returned to the handwriting 1.

Referring to fig. 3, two upright rods 16 are arranged in the pen body 1, the upright rods 16 are arranged at one end of the cavity 3 close to the opening 4, the length direction of the upright rods 16 is parallel to the length direction of the measuring needle 2, sliding blocks are arranged at two sides of the measuring needle 2, and sliding grooves for the sliding blocks to slide are formed in the upright rods 16; the vertical rod 16 plays a certain guiding role for the sliding of the measuring pin 2, thereby ensuring that the measuring pin 2 slides out of the opening 4.

When the circuit is detected, one end of the probe 2 slides out of the pen body 1 through the adjusting piece, a worker holds the pen body 1 to enable the probe 2 to contact the circuit to be detected, the circuit to be detected and the worker form a closed loop, and then the circuit is detected; after the circuit is detected, the measuring pin 2 is automatically recovered into the pen body 1 under the action of the recovery piece, so that the operation is simple and practical; when the circuit is not required to be detected, the measuring pin 2 is contained in the pen body 1, so that the possibility that the measuring pin 2 is corroded due to external factors is reduced, and the service life of the measuring pin 2 is prolonged.

Referring to fig. 3, the adjusting member comprises two handles 5 slidably disposed on the pen body 1, the sliding direction of the handles 5 is perpendicular to the sliding direction of the stylus 2, the pen body 1 is symmetrically arranged along the central line of the pen body 1, the grab handle 5 is provided with anti-skid grains, the pen body 1 is provided with a gap for the grab handle 5 to slide, one end of the measuring needle 2 away from the opening 4 is provided with an abutting head 6, the grab handle 5 and the abutting head 6 are both metal heads (copper, iron and the like) capable of conducting electricity, the abutting head 6 is arranged at one end of the measuring needle 2 away from the opening 4, the cross section of the abutting head 6 is trapezoidal, the abutting head 6 is abutted with the grab handle 5, and butt joint head 6 and grab handle 5 can relative slip, and grab handle 5 and the binding face of butt joint head 6 set up towards the inclination of survey needle 2, and the distance between the one end of grab handle 5 keeping away from opening 4 and survey needle 2 is less than the distance between the one end of grab handle 5 near opening 4 and survey needle 2.

Referring to fig. 3, in order to further reduce the friction between the handle 5 and the abutting head 6, a roller 8 is rotatably disposed on the handle 5, a placing groove is disposed on the handle 5, the roller 8 is disposed in the placing groove, and the roller 8 is disposed on a surface of the handle 5 close to the abutting head 6.

When order about 2 roll-off handwriting 1 of gauge needle, press grab handle 5, grab handle 5 slides towards handwriting 1, under the binding face's of slope effect, converts the slip of grab handle 5 into the slip of butt head 6, and then orders about the first 6 orientation of butt and slides near the direction of opening 4, and the first 6 slip of butt drives the one end roll-off handwriting 1 that the butt head 6 was kept away from to gauge needle 2.

Referring to fig. 3, the restoring member includes two springs 7 disposed between the abutting head 6 and the pen body 1, in this embodiment, the two springs 7 are parallel to each other and have the same length, one end of each spring 7 is disposed on the abutting head 6, the other end of each spring 7 is disposed on the sidewall of the cavity 3, and the length direction of each spring 7 is parallel to the sliding direction of the stylus 2.

During the sliding process of the stylus 2, the spring 7 is in a stretched state, and under the action of the elastic force of the spring 7, the abutting head 6 has a movement tendency of returning to an initial position, so that the stylus 2 has a movement tendency of returning to the pen body 1.

Referring to fig. 3, for reducing staff's the amount of labour, it is provided with inserted bar 10 to slide on the handwriting 1, the slip direction of inserted bar 10 is on a parallel with the slip direction of survey needle 2, set up the inserted block on the handwriting 1, inserted bar 10 slides and wears to establish on the inserted block, set up on the inserted block and supply the gliding passageway of inserted bar 10, the one end that grab handle 5 was kept away from to inserted bar 10 is provided with the dog, in order to prevent that inserted bar 10 from droing from the inserted block, through-hole 9 has been seted up on grab handle 5, through-hole 9 sets up the one end of keeping away from opening 4 at grab handle 5, inserted bar 10 can be pegged graft the.

When needing to treat that detection line carries out the multiple spot and detects, press grab handle 5 for 2 roll-off handwriting 1 of testing pin, after through-hole 9 and inserted bar 10 coaxial line, peg graft inserted bar 10 in through-hole 9, and then fix grab handle 5 to required position, need not the staff and press grab handle 5 all the time, reduced staff's the amount of labour.

Referring to fig. 3 and 4, in order to facilitate the detection of lines in corners difficult to extend by workers, the probe 2 includes a loop bar 21 disposed on the abutting head 6 and a slide bar 22 slidably sleeved in the loop bar 21, the length direction of the loop bar 21 is perpendicular to the sliding direction of the grip 5, a limiting member for limiting the slide of the slide bar 22 is disposed on the loop bar 21, the limiting member includes a threaded section 11 disposed on the slide bar 22, and a threaded groove 12 in threaded fit with the threaded section 11 is disposed on the inner wall of the loop bar 21.

Press grab handle 5, grab handle 5 slides towards the handwriting 1, under the effect of the binding face of slope, converts the slip of grab handle 5 into the slip of butt head 6, and then orders about the first 6 orientation of butt and slide near opening 4's direction, and the first 6 slip of butt drives the slide pin 2 and slides and roll-off handwriting 1, rotates slide bar 22 afterwards for slide bar 22 roll-off loop bar 21, and then has increased the length of slide pin 2.

In other embodiments, the limiting member can replace a bolt screwed on the sleeve rod 21, the bolt is arranged at one end of the sleeve rod 21 close to the opening 4, and the bolt passes through the sleeve rod 21 and abuts against the sliding rod 22; when the slide bar 22 is slid out to a desired position, the bolt is turned so that the bolt abuts against the slide bar 22, thereby allowing the slide bar 22 to be fixed to the desired position.

Referring to fig. 1 and 2, in order to reduce the possibility that external impurities enter the pen body 1, a sealing plate 13 for closing the opening 4 is rotatably disposed on the pen body 1, two sealing plates 13 are disposed on the sealing plate 1, the rotation axes of the two sealing plates 13 are perpendicular to the sliding direction of the stylus 2, an articulated shaft 14 is rotatably disposed on the pen body 1, the articulated shaft 14 is provided with two sealing plates, the rotation axis of the articulated shaft 14 is parallel to the rotation axis of the sealing plate 13, two ends of the articulated shaft 14 are disposed on the side wall of the cavity 3, the articulated shaft 14 is disposed at one end of the cavity 3 away from the abutting head 6, an elastic member is disposed on the pen body 1 and enables the sealing plate 13 to be flush with the plane of the opening 4, the elastic member includes a torsion spring 15 sleeved on the articulated shaft 14, one side of the torsion spring 15.

When the measuring pin 2 slides out of the pen body 1, the measuring pin 2 pushes the sealing plate 13 open, and meanwhile, the torsion spring 15 is driven by the sealing plate 13 to be twisted, so that the torsion spring 15 generates torsion; when the stylus 2 returns to the pen body 1, the sealing plate 13 automatically returns to a required position under the action of the torsion spring 15, and the opening 4 is further sealed.

The implementation principle of the fire-fighting weak current engineering safety detection device in the embodiment of the application is as follows:

when detecting the circuit, press grab handle 5, grab handle 5 slides towards the handwriting 1, under the binding face's of slope effect, converts the slip of grab handle 5 into the slip of butt head 6, and then orders about the slip of butt head 6 orientation near opening 4, and butt head 6 slides and drives the one end roll-off handwriting 1 that butt head 6 was kept away from to probe 2, and the one end contact that keeps away from butt head 6 with probe 2 later waits to detect the circuit.

If the multipoint of the line is detected, the inserting rod 10 is slid, so that the inserting rod 10 is inserted into the through hole 9; when the length of the measuring probe 2 needs to be increased, the sliding rod 22 is rotated, so that the sliding rod 22 slides out of the loop bar 21, and the length of the measuring probe 2 is increased.

After the detection is finished, the insertion rod 10 is pulled out, the abutting joint head 6 is driven to slide and return to a required position under the action of the elastic force of the spring 7, and the abutting joint head 6 slides to drive the measuring needle 2 to return to the pen body 1.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a fire control weak current engineering safety inspection device, includes handwriting (1), be provided with in handwriting (1) survey needle (2), its characterized in that: offer cavity (3) in the handwriting (1), stylus (2) slide and set up in cavity (3), offer opening (4) that supply stylus (2) roll-off on handwriting (1), opening (4) with cavity (3) intercommunication sets up, stylus (2) slide along handwriting (1) length direction, be provided with the regulating part that is used for driving stylus (2) roll-off handwriting (1) on handwriting (1), be provided with in handwriting (1) and order about stylus (2) to return the piece that returns in handwriting (1) to reply.

2. The fire-fighting weak current engineering safety detection device as claimed in claim 1, wherein: the regulating part is including sliding grab handle (5) that sets up on pen body (1), the slip direction of the slip direction perpendicular to survey needle (2) of grab handle (5), the one end that opening (4) were kept away from in survey needle (2) is provided with butt head (6), butt head (6) with grab handle (5) butt sets up, the binding face of grab handle (5) and butt head (6) sets up towards survey needle (2) slope, the distance between one end that opening (4) were kept away from in grab handle (5) and survey needle (2) is less than the distance between one end that grab handle (5) is close to opening (4) and survey needle (2).

3. The fire-fighting weak current engineering safety detection device as claimed in claim 2, wherein: the restoring piece comprises a spring (7) arranged between the abutting joint head (6) and the pen body (1), one end of the spring (7) is arranged on the abutting joint head (6), the other end of the spring is arranged on the side wall of the cavity (3), and the length direction of the spring (7) is parallel to the sliding direction of the measuring needle (2).

4. The fire-fighting weak current engineering safety detection device as claimed in claim 2, wherein: the handle (5) is rotatably provided with a roller (8), and the roller (8) is arranged on the surface of the handle (5) close to the abutting joint head (6).

5. The fire-fighting weak current engineering safety detection device as claimed in claim 2, wherein: the pen is characterized in that the grab handle (5) is provided with a through hole (9), the pen body (1) is provided with an inserted bar (10) in a sliding mode, and the inserted bar (10) can be matched with the through hole (9) in an inserting mode.

6. The fire-fighting weak current engineering safety detection device as claimed in claim 5, wherein: the measuring probe (2) comprises a loop bar (21) arranged on the abutting joint (6) and a sliding rod (22) sleeved in the loop bar (21) in a sliding mode, the length direction of the loop bar (21) is perpendicular to the sliding direction of the grab handle (5), and a limiting piece used for limiting the sliding of the sliding rod (22) is arranged on the loop bar (21).

7. The fire-fighting weak current engineering safety detection device as claimed in claim 6, wherein: the limiting piece comprises a threaded section (11) arranged on the sliding rod (22), and a threaded groove (12) in threaded fit with the threaded section (11) is formed in the inner wall of the sleeve rod (21).

8. The fire-fighting weak current engineering safety detection device as claimed in claim 3, wherein: the pen is characterized in that a sealing plate (13) used for closing the opening (4) is arranged on the pen body (1) in a rotating mode, the rotating axis of the sealing plate (13) is perpendicular to the sliding direction of the measuring needle (2), and an elastic piece enabling the sealing plate (13) to be flush with the plane where the opening (4) is located is arranged on the pen body (1).

9. The fire-fighting weak current engineering safety detection device as claimed in claim 8, wherein: rotate on the handwriting (1) and be provided with articulated shaft (14), the axis of rotation of articulated shaft (14) is on a parallel with the axis of rotation of closing plate (13), the both ends setting of articulated shaft (14) is on the lateral wall of cavity (3), articulated shaft (14) set up the one end of keeping away from butt head (6) in cavity (3), the elastic component is established torsional spring (15) on articulated shaft (14) including the cover, one side setting of torsional spring (15) is on closing plate (13), the another side setting is on the lateral wall of cavity (3).