CN113964713A - First and second vacuum fusion ring net cage - Google Patents

Abstract

The invention discloses a secondary vacuum fusion ring net cage which comprises a cabinet body, wherein the cabinet body comprises a base and a sliding seat arranged in the base in a sliding manner; the top of the base is provided with a position-giving opening for the sliding seat to extend out; the base is internally provided with a driving mechanism for driving the sliding seat to extend out of the abdicating opening, and the sliding seat is arranged on the driving mechanism; be provided with the stop gear who is located around the mouth of stepping down on the base, stop gear is including being the symmetry and setting up the apron in the mouth both sides of stepping down, and the apron rotates and sets up on the base to the apron of both sides is close to each other or the direction upset of keeping away from each other around respective rotation axial. The sliding seat is slid into the base by starting the driving mechanism, and at the moment, the sliding seat can be accommodated into the base; therefore, the cabinet body with the original double-layer structure is reduced into a single-layer structure, and the whole height of the cabinet body is adjusted; and then the occupied space of looped netowrk case when having reduced the transportation, made things convenient for the effect of transport work.

Description

First and second vacuum fusion ring net cage

Technical Field

The invention relates to the field of ring net cages, in particular to a primary and secondary vacuum fusion ring net cage.

Background

In a 10kv power distribution network, a primary and secondary vacuum fusion ring net cage is a common method for terminal equipment power distribution equipment. The real meaning of ring net case is the box structure that forms with the equipment of a plurality of cubical switchboard of looped netowrk wiring, and it can be circuit breaker cabinet, load switch cabinet, or the cubical switchboard that high-tension load switch adds the fuse and constitutes. Each switch station in the primary and secondary vacuum fusion ring net cage is provided with an intelligent control module, and a worker can distinguish common faults, protect common faults and recover a power supply system without going out to observe the operation condition of the ring net cage.

The ring main unit in the related art is generally of a double-layer structure and is formed by sequentially assembling a plurality of switch cabinets; the internal elements of the switch cabinet are usually installed in a field assembly mode, the shell of the switch cabinet is usually of a double-layer structure, and when the shell of the switch cabinet is transported, the height of a single switch cabinet is relatively high, so that the space occupied by the ring main unit is relatively large during transportation, and the ring main unit with the large volume brings inconvenience to transportation work.

Disclosure of Invention

In order to improve when transporting the ring box with a net, the great ring box with a net of volume will bring inconvenient problem for transportation work, this application provides a one secondary vacuum fusion ring box with a net.

The secondary vacuum fusion ring net cage comprises a cabinet body, wherein the cabinet body comprises a base and a sliding seat arranged in the base in a sliding manner; the top of the base is provided with a position-giving opening for the sliding seat to extend out; the base is internally provided with a driving mechanism for driving the sliding seat to extend out of the abdicating opening, and the sliding seat is arranged on the driving mechanism; be provided with the stop gear who is located around the mouth of stepping down on the base, stop gear is including being the symmetry and setting up the apron in the mouth both sides of stepping down, the apron rotates and sets up on the base to the apron of both sides is close to each other or the direction upset of keeping away from each other around respective rotation axial.

By adopting the technical scheme, when the cabinet body needs to be transported, the sliding seat slides into the base by starting the driving mechanism, and at the moment, the sliding seat can be accommodated into the base; therefore, the cabinet body with the original double-layer structure is reduced into a single-layer structure, and the whole height of the cabinet body is adjusted; therefore, the space occupied by the ring main unit during transportation is reduced, and the carrying work is facilitated; when transporting the cabinet body to the assembly scene after, rethread actuating mechanism will carry out the lifting with the slide, makes the slide upper end stretch out from stepping down the mouth gradually, and the slide can open the apron that covers in stepping down the mouth respectively to both sides at the in-process that rises to guaranteed that the slide can rise in the base smoothly.

Optionally, the limiting mechanism further comprises a pressing plate located between the cover plates on the two sides, the pressing plate is parallel to the rotating shafts of the cover plates on the two sides, and the pressing plate is located above the cover plates; the pressing plate is provided with a sliding rod, and the sliding rod is arranged on the base in a sliding manner along the lifting direction of the sliding seat; the cover plate is provided with a stepped groove for inserting the pressing plate.

By adopting the technical scheme, as the sliding seat gradually rises from the base, the sliding seat pushes the cover plates on the two sides to be opened towards the direction of mutual separation; the cover plate which is gradually opened pushes the pressing plate to gradually move upwards, when the sliding seat pushes the cover plates on the two sides to be in a vertical state, the two ends of the pressing plate are respectively inserted into the corresponding stepped grooves, the sliding seat moves to the maximum height, and the pressing plate is also attached to the upper surface of the sliding seat; at the moment, the cover plates on the two sides keep a vertical state under the constraint of the pressing plate; the apron of both sides will also laminate with the lateral wall of slide this moment, under the common spacing of clamp plate and both sides apron, can improve the holistic stability of slide after the roll-off.

Optionally, a first spring is arranged on the pressure plate, and the first spring extends and retracts along the sliding direction of the sliding rod; one end of the first spring, which is far away from the pressure plate, is connected with the base.

By adopting the technical scheme, the first spring is gradually stretched along with the gradual rise of the height of the pressing plate, and when the height of the pressing plate moves to be in contact with the upper surface of the sliding seat, the pressing plate is mutually pressed with the upper surface of the sliding seat under the action of the elastic force of the first spring; therefore, the stability of the sliding seat can be further improved, and the sliding seat can be more firmly pressed on the driving mechanism.

Optionally, a sliding plate located below the first spring is arranged on the base, and the sliding plate is arranged on the base in a sliding manner along the telescopic direction of the first spring; one end of the first spring, which is far away from the pressure plate, is arranged on the sliding plate, and the first spring is connected with the base through the sliding plate; the lower end of the sliding plate is limited on the base.

By adopting the technical scheme, when the height of the pressing plate gradually rises, the first spring drives the sliding plate to gradually move upwards, and because the lower end of the sliding plate is limited on the base, when the sliding plate moves to the maximum upwards moving height, the sliding plate stops moving upwards; at the moment, the first spring is further stretched continuously along with the pressing plate until the pressing plate is attached to the upper surface of the sliding seat; the setting of slide can reduce the biggest tensile stroke of first spring to the condition that can prevent to take place to warp because of the tensile volume of spring is too big, has prolonged the life of first spring.

Optionally, a pressure bar located at the stepped groove is arranged on the cover plate, and the pressure bar slides along the direction in which the pressure bar is inserted into the stepped groove; the pressing rod is sleeved with a second spring for ejecting the head of the pressing rod out of the stepped groove, and the tail of the pressing rod is positioned in the cover plate; a limiting rod is arranged in the cover plate in a sliding mode, and the limiting rod slides along the direction perpendicular to the extension direction of the second spring; the tail part of the compression bar is opposite to the tail part of the limiting rod, and the head part of the limiting rod penetrates out of the side wall of the cover plate, which is away from the sliding seat; and the cover plate positioned on the other side is provided with a jack for inserting the limiting rod.

By adopting the technical scheme, when two adjacent cabinet bodies are assembled, the outer side walls of the adjacent cabinet bodies are firstly attached to each other; then the sliding seats are lifted from the respective bases, when the pressing plates are inserted into the stepped grooves, the pressing plates push the pressing rods to press downwards, and at the moment, the second springs are compressed; the pressure rod pushes the limiting rod to move in the direction away from the sliding seat along with the pressing of the pressure rod; finally, the head of the limiting rod penetrates out of the outer side wall of the cover plate where the limiting rod is located and is inserted into the jack on the adjacent cover plate; through the mutual grafting of gag lever post and jack, just can realize spacing along ascending in the fore-and-aft direction between two adjacent cabinets bodies.

Optionally, the limiting rod is sleeved with a third spring for retracting the head of the limiting rod into the cover plate, the third spring is located in the cover plate, and the third spring stretches along the sliding direction of the limiting rod.

By adopting the technical scheme, when the limiting rod is inserted into the jack on the adjacent cover plate, the third spring is in a compressed state; when the clamp plate shifts out from the ladder inslot, the second spring will promote the depression bar and upwards lift up, and the gag lever post will reset under the elastic force effect of third spring here simultaneously, and the head of gag lever post will also retract again to in the apron to dismantle the back with adjacent cabinet body, realize accomodating the gag lever post, played the protection to the gag lever post.

Optionally, a plug connector close to a cover plate on one side is arranged on a side wall of the pressing plate, which is far away from the sliding seat, and the plug connector extends to the outside of an adjacent cover plate in the direction far away from the pressing plate; the side wall of the pressing plate, which is far away from the sliding seat, is also provided with a plug hole for inserting the plug connector; the plug hole is positioned on one side of the pressing plate far away from the plug connector.

By adopting the technical scheme, when the adjacent cabinet bodies are assembled, the plug connector is inserted into the plug hole of the adjacent pressing plate from top to bottom along with the pressing plate at the moment that the pressing plate is inserted into the step groove; through the plug-in connection matching of the plug-in connector and the plug-in hole, the spacing fixation between adjacent cabinet bodies along the left direction and the right direction is realized.

Optionally, a swinging piece is arranged on the base, and the middle section of the swinging piece is rotatably connected to the base; the tail part of the swinging piece is provided with an elastic rope, and the other end of the elastic rope is connected with a driving mechanism; the head of the swinging piece penetrates out of the outer side wall of the base, and a limit groove for the head of the swinging piece to insert is formed in the side wall of the base, which is far away from the swinging piece; and a fourth spring close to the head of the swinging piece is arranged on the swinging piece and used for lifting the head of the swinging piece upwards.

By adopting the technical scheme, when the adjacent cabinet bodies are assembled, the driving mechanism gradually lifts the sliding seat along with the driving mechanism, the driving mechanism drives the elastic rope to lift the tail part of the swinging piece upwards, at the moment, the head part of the swinging piece downwards rotates around the rotating shaft, and finally, the head part of the swinging piece is inserted into the limiting groove of the adjacent cabinet body from top to bottom; through the inserting and connecting cooperation of the swinging piece and the limiting groove, the connection between the adjacent bases is enhanced, and the limiting fixation between the bases is realized.

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

when the cabinet body needs to be transported, the sliding seat slides into the base by starting the driving mechanism, and at the moment, the sliding seat can be accommodated into the base; therefore, the cabinet body with the original double-layer structure is reduced into a single-layer structure, and the whole height of the cabinet body is adjusted; and then the occupied space of the ring main unit is reduced during transportation, and the carrying work is facilitated.

Drawings

Fig. 1 is a schematic view of an overall structure after the assembly of the embodiment of the present application is completed.

Fig. 2 is a partial structural view highlighting the drive mechanism.

Fig. 3 is a schematic view of the overall structure of the raised back slide of fig. 1.

Fig. 4 is a schematic overall structure diagram of an embodiment of the present application.

FIG. 5 is a sectional view showing a part of the structure of the stopper rod inside the cover plate.

Description of reference numerals:

1. a cabinet body; 11. a base; 111. a slide plate; 112. a limiting groove; 12. a slide base; 13. a let position port; 14. a swinging member; 141. an elastic cord; 142. a fourth spring; 2. a drive mechanism; 21. a loading plate; 3. a limiting mechanism; 31. a cover plate; 311. a stepped groove; 312. a pressure lever; 313. a second spring; 32. pressing a plate; 321. a slide bar; 322. a first spring; 33. a limiting rod; 331. a jack; 332. a third spring; 34. a plug-in unit; 341. inserting holes; 4. a slideway.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses a secondary vacuum fusion ring net cage. Referring to fig. 1 and 2, the first and second vacuum fusion ring net cage comprises a cabinet body 1, wherein the cabinet body 1 comprises a base 11 and a sliding seat 12 slidably arranged in the base 11. The top of the base 11 is provided with a yielding port 13 for the sliding seat 12 to extend out of the base 11, and two sets of driving mechanisms 2 for driving the sliding seat 12 to lift along the vertical direction are installed in the base 11. The driving mechanisms 2 are symmetrically arranged at the left side and the right side of the sliding seat 12.

As shown in fig. 2 and 3, the driving mechanism 2 includes a cylinder with a piston rod facing the bottom of the sliding base 12, and the bottom of the cylinder is fixedly installed in the base 11. The piston rod of the cylinder is fixedly provided with a horizontally arranged carrying plate 21, the carrying plates 21 on the two sides are positioned on the same horizontal plane, and the carrying plates 21 on the two sides keep synchronous lifting during working. The bottom of the carriage 12 is fixedly mounted on two side carrier plates 21.

As shown in fig. 3 and 4, the top of the base 11 is provided with the limiting mechanism 3 located around the abdicating port 13, the limiting mechanism 3 includes two sets of cover plates 31, the cover plates 31 are symmetrically arranged on the left and right sides of the abdicating port 13, and one end of the cover plate 31 is rotatably connected to the top side wall of the base 11. The rotation axes of the cover plates 31 extend horizontally in the front-rear direction of the base 11, and the cover plates 31 on both sides are turned in directions to approach or separate from each other about the respective rotation axes.

As shown in fig. 3 and 4, the limiting mechanism 3 further includes a pressing plate 32 located between the two side cover plates 31, and the pressing plate 32 is parallel to the rotating shafts of the two side cover plates 31. Three vertically arranged sliding rods 321 are fixedly mounted on the pressing plate 32, the sliding rods 321 are close to the rear of the base 11, and the lower ends of the sliding rods 321 are arranged on the base 11 in a sliding manner along the vertical direction. The base 11 is further provided with a slide 4 located below the pressing plate 32, the slide 4 is located on one side of the sliding rod 321 away from the sliding base 12, and the length direction of the slide 4 extends along the sliding direction of the sliding rod 321. The base 11 is further provided with a sliding plate 111 located in the slideway 4, the sliding plate 111 is slidably disposed in the slideway 4 along the length direction of the sliding rod 321, the lower end of the sliding plate 111 is limited in the slideway 4, and when the lower end of the sliding plate 111 moves to the opening at the upper end of the slideway 4, the sliding plate 111 is limited in the slideway 4 and cannot move upwards continuously.

As shown in fig. 3 and 4, two sets of symmetrical first springs 322 are disposed between the sliding plate 111 and the pressing plate 32, and the first springs 322 extend and contract along the length direction of the sliding rod 321. The lower end of the first spring 322 is fixedly connected with the sliding plate 111, and the upper end of the first spring 322 is fixedly connected with the pressing plate 32.

As shown in fig. 4 and 5, the end of the cover plate 31 away from the rotation axis is provided with a stepped groove 311 for inserting the pressing plate 32, when the driving mechanism 2 lifts the slide carriage 12 to the maximum height, the cover plates 31 on both sides will turn to the vertical state around the respective rotation axes, and the cover plates 31 on both sides will be placed oppositely. At this time, the pressing plate 32 is pressed downward into the stepped grooves 311 on both sides, and the pressing plate 32 is bridged over the cover plates 31 on both sides.

As shown in fig. 4 and 5, two sets of pressing rods 312 are disposed on one cover plate 31 and located at the stepped groove 311, and the two sets of pressing rods 312 are symmetrically disposed on the front and rear sides of the cover plate 31. When the cover plate 31 is turned to the vertical state, the pressing rod 312 will also be in the vertical state. And a pressing bar 312 is slidably provided on the cover plate 31 in a direction in which the pressing plate 32 is inserted into the stepped groove 311. The lower end of the pressing rod 312 is sleeved with a second spring 313 used for ejecting the head of the pressing rod 312 from the upper surface of the stepped groove 311, one end of the second spring 313 is fixed with the pressing rod 312, and the other end of the second spring 313 is fixed with the upper surface of the stepped groove 311. The tail part of the pressure rod 312 is inserted into the cover plate 31, the limit rod 33 close to the tail part of the pressure rod 312 is arranged in the cover plate 31 in a sliding mode, and the limit rod 33 is arranged in the cover plate 31 in a sliding mode along the direction perpendicular to the extending and contracting direction of the second spring 313.

As shown in fig. 4 and 5, the tail of the limit rod 33 is opposite to the tail of the pressing rod 312, the tail of the limit rod 33 is provided with an inclined surface facing the tail of the pressing rod 312, and the head of the limit rod 33 penetrates out of the side wall of the cover plate 31 departing from the sliding seat 12. When the pressing plate 32 pushes the pressing rod 312 to press down, the tail of the pressing rod 312 will push the limiting rod 33 along the inclined surface of the limiting rod 33, and finally the head of the limiting rod 33 will pass through the outer side wall of the cover plate 31 away from the sliding seat 12. Two insertion holes 331 are formed in the cover plate 31 on the other side of the same base 11, and the two insertion holes 331 are respectively used for inserting the heads of the limiting rods 33 on the adjacent cover plates 31.

As shown in fig. 4 and 5, each of the position-limiting rods 33 is sleeved with a third spring 332 for retracting the head of the position-limiting rod 33 into the cover plate 31, and the third spring 332 is located in the cover plate 31. One end of the third spring 332 is fixed to the limiting rod 33, and the other end of the third spring 332 abuts against the inner side wall of the cover plate 31. The third spring 332 extends and contracts in the sliding direction of the stopper rod 33, and when the head of the stopper rod 33 passes through the outer side wall of the cover plate 31, the third spring 332 is gradually compressed. When the tail of the pressing rod 312 is separated from the tail of the stopper rod 33, the head of the stopper rod 33 will be retracted into the cover plate 31 by the elastic force of the third spring 332.

As shown in fig. 4 and 5, a plug connector 34 close to the limit rod 33 is installed on a side wall of the pressing plate 32 away from the sliding base 12, the plug connector 34 extends to the outside of the adjacent cover plate 31 in a direction away from the pressing plate 32, and one end of the plug connector 34 away from the pressing plate 32 is vertically bent downwards and is formed with a plug section. The side wall of the plug connector 34 departing from the sliding base 12 is further provided with a plug hole 341 for the plug connector 34 on the adjacent cabinet body 1 to be inserted, and the plug hole 341 is located on one side of the pressing plate 32 where the plug connector 34 is located.

As shown in fig. 2 and 3, two sets of swinging members 14 are mounted at the bottom of the base 11, the swinging members 14 are symmetrically arranged at the front and rear sides of the base 11, and the two sets of swinging members 14 are located below the same side cover plate 31. The middle section of the swinging member 14 is rotatably connected to the base 11, and the rotating shaft of the swinging member 14 is perpendicular to the lifting direction of the slider 12. An elastic rope 141 is fixedly installed at the tail of the swinging member 14, and the other end of the elastic rope 141 is fixedly connected with the loading plate 21 right above. The heads of the swinging members 14 penetrate through the outer side walls of the bases 11 where the swinging members are respectively located, two sets of symmetrical limiting grooves 112 are formed in the side walls of the bases 11 departing from the swinging members 14, and the limiting grooves 112 are used for inserting the heads of the corresponding swinging members 14 on the adjacent bases 11.

As shown in fig. 2 and 3, the swinging member 14 is provided with a fourth spring 142 near the head thereof, and the fourth spring 142 is located on the side wall of the swinging member 14 facing away from the upper carrier plate 21. The upper end of the fourth spring 142 is fixedly connected with the swinging member 14, and the lower end of the fourth spring 142 is fixedly connected with the base 11. The fourth spring 142 is used to raise the head of the oscillating member 14 upward to return.

The implementation principle of the first-time and second-time vacuum fusion ring net cage in the embodiment of the application is as follows:

when the cabinet 1 needs to be transported, the driving mechanism 2 is started to slide the sliding seat 12 into the base 11, and at this time, the sliding seat 12 can be accommodated into the base 11. Thereby make the cabinet body 1 of bilayer structure reduce into single-layer construction originally, realized the regulation to cabinet body 1 overall height. And then the occupied space of the ring main unit is reduced during transportation, and the carrying work is facilitated. After the cabinet body 1 is transported to an assembly site, the sliding seat 12 is lifted by the driving mechanism 2, so that the upper end of the sliding seat 12 gradually extends out of the abdicating opening 13, and the cover plates 31 covering the abdicating opening 13 can be respectively opened towards two sides during the lifting process of the sliding seat 12, thereby ensuring that the sliding seat 12 can be smoothly lifted from the base 11.

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 (8)

1. A second vacuum fusion ring box with a net, including the cabinet body (1), its characterized in that: the cabinet body (1) comprises a base (11) and a sliding seat (12) which is arranged in the base (11) in a sliding manner; the top of the base (11) is provided with a position-giving opening (13) for the sliding seat (12) to extend out; a driving mechanism (2) for driving the sliding seat (12) to extend out of the abdicating opening (13) is arranged in the base (11), and the sliding seat (12) is arranged on the driving mechanism (2); be provided with on base (11) and be located and let stop gear (3) around a mouthful (13), stop gear (3) are including being apron (31) that the symmetry set up in letting a mouthful (13) both sides, apron (31) rotate and set up on base (11) to apron (31) of both sides are close to each other or the direction upset of keeping away from each other around respective rotation axial.

2. The primary and secondary vacuum fusion ring net cage according to claim 1, wherein: the limiting mechanism (3) further comprises a pressing plate (32) positioned between the cover plates (31) on the two sides, the pressing plate (32) is parallel to the rotating shafts of the cover plates (31) on the two sides, and the pressing plate (32) is positioned above the cover plates (31); a sliding rod (321) is arranged on the pressing plate (32), and the sliding rod (321) is arranged on the base (11) in a sliding manner along the lifting direction of the sliding seat (12); the cover plate (31) is provided with a stepped groove (311) for inserting the pressure plate (32).

3. The primary and secondary vacuum fusion ring net cage according to claim 2, wherein: the pressing plate (32) is provided with a first spring (322), and the first spring (322) stretches along the sliding direction of the sliding rod (321); one end of the first spring (322) far away from the pressure plate (32) is connected with the base (11).

4. The primary and secondary vacuum fusion ring net cage according to claim 3, wherein: a sliding plate (111) positioned below the first spring (322) is arranged on the base (11), and the sliding plate (111) is arranged on the base (11) in a sliding manner along the telescopic direction of the first spring (322); one end, far away from the pressure plate (32), of the first spring (322) is arranged on the sliding plate (111), and the first spring (322) is connected with the base (11) through the sliding plate (111); the lower end of the sliding plate (111) is limited on the base (11).

5. The primary and secondary vacuum fusion ring net cage according to claim 2, wherein: the cover plate (31) is provided with a pressure lever (312) positioned at the stepped groove (311), and the pressure lever (312) slides along the direction that the pressure plate (32) is inserted into the stepped groove (311); the pressing rod (312) is sleeved with a second spring (313) used for ejecting the head of the pressing rod (312) out of the stepped groove (311), and the tail of the pressing rod (312) is positioned in the cover plate (31); a limiting rod (33) is arranged in the cover plate (31) in a sliding mode, and the limiting rod (33) slides along the direction perpendicular to the extension direction of the second spring (313); the tail part of the pressure lever (312) is over against the tail part of the limiting rod (33), and the head part of the limiting rod (33) penetrates out of the side wall of the cover plate (31) deviating from the sliding seat (12); the cover plate (31) positioned at the other side is provided with an insertion hole (331) for inserting the limiting rod (33).

6. The primary and secondary vacuum fusion ring net cage according to claim 5, wherein: the utility model discloses a safety device, including stopper rod (33), third spring (332) that is used for withdrawing stopper rod (33) head to apron (31) on the cover is equipped with on stopper rod (33), third spring (332) are located apron (31), just third spring (332) are flexible along the glide direction of stopper rod (33).

7. The primary and secondary vacuum fusion ring net cage according to claim 2, wherein: a plug connector (34) close to a cover plate (31) on one side is arranged on the side wall, away from the sliding seat (12), of the pressing plate (32), and the plug connector (34) extends to the outside of the adjacent cover plate (31) in the direction far away from the pressing plate (32); the side wall of the pressing plate (32) departing from the sliding seat (12) is also provided with an inserting hole (341) for inserting the inserting piece (34); the plug-in hole (341) is positioned on one side of the pressure plate (32) far away from the plug connector (34).

8. The primary and secondary vacuum fusion ring net cage according to claim 1, wherein: the base (11) is provided with a swinging piece (14), and the middle section of the swinging piece (14) is rotatably connected to the base (11); the tail part of the swinging piece (14) is provided with an elastic rope (141), and the other end of the elastic rope (141) is connected with the driving mechanism (2); the head of the swinging piece (14) penetrates out of the outer side wall of the base (11), and a limit groove (112) for inserting the head of the swinging piece (14) is formed in the side wall of the base (11) deviating from the swinging piece (14); the swinging piece (14) is provided with a fourth spring (142) close to the head of the swinging piece, and the fourth spring (142) is used for lifting the head of the swinging piece (14) upwards.

Images