CN208849178U - A kind of floor socket outlet device with creepage protection function - Google Patents

Abstract

The utility model discloses a kind of floor socket outlet device with creepage protection function; jack body including being rotatably dispose in pedestal is provided with static contact, moving contact, the first elastic component, operating mechanism, interlocking mechanism and electrical leakage tripping device in the jack body；The interlocking mechanism has the lock state for making the operating mechanism and moving contact link, and the operating mechanism and moving contact is made to be detached from the unlocked state of cooperation；It is arranged by the driving end of electrical leakage tripping device and interlocking mechanism's linkage; when leak current fault occurs; it drives the interlocking mechanism to be in the unlocked position by electrical leakage tripping device, is moved to trigger the moving contact far from static contact, floor socket outlet is made to cut off leak current fault circuit in time; it is fast and accurate to trigger speed; the creepage protection function for realizing floor socket outlet avoids electrical equipment scaling loss and accident of human electric shock, ensures line security; it is practical reliable, guarantee the safe handling of product.

Description

A kind of floor socket outlet device with creepage protection function

Technical field

The utility model relates to jack device technical fields, and in particular to a kind of floor socket outlet with creepage protection function Device.

Background technique

Floor socket outlet referred to as is inserted, and is mounted on ground or similar site, the socket for connecting with fixed wiring, usually As the terminal and line outlet of ground wiring system, there is the moving body that may be reversed ground, it is easy to use, it is answered extensively It is widely used for the indoor place of the large bay such as office space, airport, hotel, market, family.

Existing floor socket outlet mainly includes metal shell, jack body and setting in metal shell and socket sheet on the market Mechanism is bounced between body, there is jack panel on jack body, the conductor assembly of connection power supply, jack body is arranged inside It is arranged on metal shell by bouncing mechanism and may be reversed, the installation ground where metal shell is jumped out in overturning when in use, is made Jack panel and jack body overturning can be embedded among geosyncline by jack panel side outwardly, and when not in use, for safety Using floor socket outlet, an earth leakage protective device being applied in combination with floor socket outlet is installed in people's selection in geosyncline, is both increased in this way Big small product size and installation space, and increase cost, installation wiring is inconvenient, and is not suitable for.According to the above structure, it can be seen that, existing Floor socket outlet itself be not have creepage protection function, therefore, floor socket outlet is when leak current fault occurs can not be timely By electric power loop cutting, the in this way electrical equipment on meeting scaling loss route, accident of human electric shock also easy to happen, or even electricity can be caused Gas fire, safety are poor.

Utility model content

Therefore, the technical problem to be solved by the present invention is to overcome floor socket outlet in the prior art leaking electricity Electric power loop can not be cut off in time when failure, understand the electrical equipment on scaling loss route in this way and cause accident of human electric shock, pacified The problem of full property difference, so that providing one kind can cut off the power circuit when leak current fault occurs, safe and reliable has guarantor of leaking electricity The floor socket outlet device of protective function.

In order to solve the above technical problems, the utility model provides a kind of floor socket outlet device with creepage protection function, Jack body including being rotatably set to pedestal is provided with static contact, the first elastic component in the jack body, described The lower moving contact far from the static contact of one elastic component effect, and the driving moving contact overcome the effect of first elastic component Power contacts the operating mechanism of the static contact, and the interlocking mechanism being set between the operating mechanism and the moving contact； The interlocking mechanism has the lock state for making the operating mechanism and the moving contact link, and make the operating mechanism with The moving contact is detached from the unlocked state of cooperation；

It further include the electrical leakage tripping device for being set to the jack body, the electrical leakage tripping device includes and the interlocking The driving end of mechanism linkage, the driving end drive the interlocking mechanism to be in described when the electrical leakage tripping device is triggered Unlocked state, so that the moving contact separates under first elastic component effect with the static contact.

As a preferred embodiment, it is supported including being slidably mounted on the contact of the jack body, the moving contact setting Support that the static contact corresponds on the intermediate bulkhead that the moving contact is arranged in the jack body, described in the contact First elastic component is set to the contact and supports the moving contact edge that the contact can be driven to support between the intermediate bulkhead First direction moves away from the static contact；The operating mechanism includes moving to be extended through the centre along the first direction Operating stick between partition and contact support.

As a preferred embodiment, the interlocking mechanism includes:

Fit structure is set to the operating stick periphery；

Locking structure is movably arranged along the second direction perpendicular to the first direction and supports in the contact, along institute Second direction is stated with the sticking department cooperated with the fit structure to link with the operating stick, and, allow the operation The freedom portion that bar is move freely；

Third elastic component is connected with the locking structure, sticking department described in the elastic power drive of the third elastic component with The fit structure cooperation.

As a preferred embodiment, the operating mechanism includes the operating stick and is set to the jack body and institute The second elastic component between operating stick is stated, it is described when the operating stick is supported to cooperate by the interlocking mechanism and the contact Second elastic component drives the operating stick to drive the moving contact to contact with the static contact along the first direction.

As a preferred embodiment, the electrical leakage tripping device include along the slidable elastic push rod of the second direction, The driving end is arranged on the elastic push rod, and the locking structure is through one end that the contact is supported and the elastic top Bar is cooperatively connected, and the elastic push rod is the third elastic component.

As a preferred embodiment, be provided with annular groove on the elastic push rod, the respective end of the locking structure at Type has the socket being interspersed in the annular groove, and the socket extending direction is parallel to the first direction.

As a preferred embodiment, the electrical leakage tripping device further includes electromagnetic coil and is set in the electromagnetic coil And the sensing iron core with elastic push rod linkage, it is provided in the jack body de- for controlling the electrical leakage tripping device Pull the control circuit board of work.

As a preferred embodiment, the fit structure is the mating groove for being opened in the operating stick, the locking knot Structure has the lockhole for allowing the operating stick to pass through, and described match is protruded into the lockhole side under the action of third elastic component It closes in groove.

As a preferred embodiment, the operating stick bottom is provided with the mating groove and is set to the mating groove The cone of lower section, the cone increase from the bottom end of the operating stick along the first direction size, the circular cone Body fits through the lockhole.

As a preferred embodiment, first elastic component and second elastic component are located at the intermediate bulkhead two It side and is sheathed in the operating stick, second elastic component both ends are respectively arranged on the intermediate bulkhead and the operating stick In the end cap on top；Second elastic component, which applies the operating stick, drives the contact to support the active force moved up, described The elastic acting force of second elastic component is greater than the elastic acting force of first elastic component.

The utility model has the advantages that compared with prior art

1. in the floor socket outlet device provided by the utility model with creepage protection function, in floor socket outlet use process In, when interlocking mechanism is in the lock state, operating mechanism and moving contact form interaction relation to drive moving contact and stationary contact Head contact, and when interlocking mechanism is in the unlocked state, moving contact is detached to match to merge with operating mechanism to be made in the first elastic component With lower separate static contact, to realize the circuit on-off of floor socket outlet, therefore, by the driving end of electrical leakage tripping device with it is described Interlocking mechanism's linkage setting, when leak current fault occurs, drives the interlocking mechanism to be in the unlocked position by electrical leakage tripping device, It is moved to trigger the moving contact far from static contact, floor socket outlet is made to cut off leak current fault circuit in time, triggering speed is fast And precisely, it realizes the creepage protection function of floor socket outlet, avoids electrical equipment scaling loss and accident of human electric shock, ensure route Safety, it is practical reliable, guarantee the safe handling of product, promotes the service performance of floor socket outlet, it is applied widely.

2. in the floor socket outlet device provided by the utility model with creepage protection function, the interlocking mechanism includes matching Structure, locking structure and third elastic component are closed, since the fit structure is arranged in operating stick, the locking structure setting exists During contact is supported, therefore, the operating stick and locking structure cooperatively form connection with fit structure by the sticking department of locking mechanism Dynamic cooperation, and then operating stick and contact is made to support to form interaction relation, it can be supported at this time by operating stick with moving contact Moving contact contacts static contact along first direction；Opposite, the operating stick can pass freely through locking when contacting the freedom portion Structure, i.e. operating stick are linked with locking structure disengaging, so that contact be made to support under the effect of the first elastic component described in drive Moving contact is moved far from the static contact.

3. in the floor socket outlet device provided by the utility model with creepage protection function, the electrical leakage tripping device packet Slidable elastic push rod in a second direction is included, the locking structure cooperates through one end that contact is supported and the elastic push rod Connection, this structure setting drive elastic push rod retracting action, to be driven by elastic push rod when electrical leakage tripping device is triggered The left end of locking structure in a second direction moves and steps down to operating stick, is detached from the mating groove of operating stick and conical sections The lockhole of locking structure, being linked between release operation bar and locking structure finally separate dynamic and static contact, realize ground The leakage protection of face socket, triggering accurately and timely, cooperate reliable transmission, and safety is good.

Detailed description of the invention

Fig. 1 is the schematic perspective view of floor socket outlet device provided by the utility model；

Schematic diagram of internal structure when Fig. 2 is the floor socket outlet device conducting circuit of the utility model；

Fig. 3 is the schematic diagram of the section structure shown in Fig. 2 along line A-A, the lock state of the specifically shown interlocking mechanism；

Schematic diagram of internal structure when Fig. 4 is the floor socket outlet device disconnection circuit of the utility model；

Fig. 5 is the schematic diagram of the section structure shown in Fig. 4 along line B-B, the unlocked state of the specifically shown interlocking mechanism；

Fig. 6 is the electrical leakage tripping device of the utility model and the mounting structure schematic diagram of locking mechanism；

Fig. 7 is the structural schematic diagram of the locking structure of the utility model；

Description of symbols: 1- jack body, 11- moving contact, 12- static contact, 13- contact-support, 14- intermediate bulkhead, 2- pedestal, 3- electrical leakage tripping device, 30- driving end, 31- elastic push rod, 32- annular groove, 4- operating mechanism, 41- operating stick, The second elastic component of 42-, 43- cone, 5- interlocking mechanism, 51- locking structure, 52- mating groove, 53- lockhole, 54- socket, 8- Control circuit board, the first elastic component of 9-.

Specific embodiment

Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation Example is a part of the embodiment of the present invention, instead of all the embodiments.

In the description of the present invention, it should be noted that term " first ", " second ", " third " are only used for describing Purpose is not understood to indicate or imply relative importance.

In the description of the present invention, it should be noted that unless otherwise specific regulation, term " installation ", " phase Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary Connection inside two elements.

Embodiment 1

The present embodiment is specifically described with reference to the accompanying drawing:

The present embodiment provides a kind of floor socket outlet devices with creepage protection function as shown in figs. 1-7, including have peace The pedestal 2 behaveing affectedly and side are rotatably dispose in the pedestal 2 to pass in and out the jack body 1 of the installation cavity, the jack body 1 Inside it is provided with static contact 12, the first elastic component 9, the moving contact far from the static contact under first elastic component 9 effect 11, and the operating mechanism 4 for driving the moving contact 11 that the active force of first elastic component is overcome to contact the static contact 12, with And it is set to the interlocking mechanism 5 between the operating mechanism 4 and the moving contact 11；The interlocking mechanism 5 have make the behaviour Make the lock state of mechanism 4 and moving contact linkage, and the operating mechanism 4 is made to be detached from cooperation with the moving contact Unlocked state；

Further include the electrical leakage tripping device 3 for being set to the jack body, the electrical leakage tripping device 3 include with it is described The driving end 30 that latch mechanism 5 links, the driving end 30 drives the interlocking mechanism when the electrical leakage tripping device 3 is triggered 5 are in the unlocked state, so that the moving contact 11 divides under first elastic component effect with the static contact 12 From.

Above embodiment is the core technology scheme of the present embodiment, in floor socket outlet use process, when interlocking mechanism 5 When being in the lock state, the operating mechanism 4 and moving contact form interaction relation to drive moving contact to contact with static contact, with And when interlocking mechanism 5 is in the unlocked state, the moving contact 11 is detached from cooperation with operating mechanism to make in the first elastic component With lower separate static contact, to realize the circuit on-off of floor socket outlet, therefore, by the driving end 30 of electrical leakage tripping device 3 with The linkage of interlocking mechanism 5 setting, when leak current fault occurs, drives the interlocking mechanism 5 by the electrical leakage tripping device 3 In unlocked state, is moved to trigger the moving contact 11 far from static contact 12, floor socket outlet is made to cut off leak current fault in time Circuit, triggering speed is fast and accurate, realizes the creepage protection function of floor socket outlet, avoids electrical equipment scaling loss and person touching Electrification ensures line security, practical reliable, guarantees the safe handling of product, promotes the service performance of floor socket outlet device, fits It is wide with range.

The floor socket outlet of the present embodiment includes being slidably mounted on the contact support 13 of the jack body 1, the moving contact 11, which are set to the contact, supports 13, and the centre in the jack body 1 is arranged in the corresponding moving contact of the static contact 12 On partition 14, first elastic component 9 is set to the contact and supports that the contact can be driven between 13 and the intermediate bulkhead It supports the moving contact on 13 to move away from the static contact along first direction, floor socket outlet is made to disconnect circuit；It is further preferred that In conjunction with Fig. 3 and Fig. 5 it is found that the moving contact 11 is moved along first direction close to or far from the static contact 12, the first party To the direction being expressed as perpendicular to 1 bottom surface of jack body, the operating mechanism 4 includes moving to be extended through along the first direction The intermediate bulkhead 14 and the contact support the operating stick 41 between 13, and are set to the jack body 1 and the behaviour Make the second elastic component 42 between bar 41, the active force that the operating stick 41 needs to rely on after moving down the second elastic component 52 resets It moves up, therefore, when the operating stick 41 supports 13 cooperation with the contact by the interlocking mechanism 5, second elastic component The 42 driving operating sticks 41 drive the moving contact 11 to contact with the static contact 12 along the first direction, make floor socket outlet Circuit is connected.

It elaborates below with reference to the specific set-up mode of Fig. 2-5 pairs of interlocking mechanisms:

The interlocking mechanism 5 includes fit structure, locking structure and third elastic component, specifically, the fit structure 52 It is set to 41 periphery of operating stick；The locking structure 51 is movably arranged along the second direction perpendicular to the first direction 13 are supported in the contact, are had along the second direction and are cooperated with the fit structure 52 with the lock with 41 linkage of operation Determine portion, and, the freedom portion for allowing the operating stick 41 to move freely；The third elastic component and 51 phase of locking structure Even, sticking department and the fit structure 52 described in the elastic power drive of the third elastic component cooperate, and the contact supports 13 edges First direction and second direction are separately formed the second through-hole of the first through hole for being adapted to locking structure and attended operation bar.It is logical Above structure is crossed it is found that the locking structure position as described in Fig. 3 and Fig. 6 passes through cooperation when operating stick 41 touches sticking department Structure 52 and sticking department cooperation define lever position, form operating stick 41 with locking structure 51 and are linked, and then make Operating stick 41 and contact support that 13 form interaction relation, can contact stationary contact by the moving contact that operating stick is supported with moving contact Head；Locking structure position as described in Figure 5 can pass freely through locking structure when the operating stick 41 contacts the freedom portion 51, i.e. operating stick is linked with locking structure disengaging, so that contact be made to support 13 to drive dynamic touching under the effect of the first elastic component 9 Head is moved far from static contact.

As a kind of specific set-up mode, as shown in fig. 6, the fit structure 52 is the cooperation for being opened in the operating stick Groove, the locking structure 51 have the lockhole 53 for allowing the operating stick to pass through, and 53 side of lockhole is in the third bullet It is protruded into the mating groove under the action of property part, in the present embodiment, the hole it should be understood that lockhole is preferably in U-shape, The lockhole side is closing one end of U-shaped hole, and the sticking department of the locking structure 51 corresponds to closing one end of lockhole 53, The freedom portion corresponds to the throughhole portions of lockhole 53, therefore, when lockhole side is stuck in the mating groove described in just formation The interaction relation of operating stick 41 and locking structure 51.

In conjunction with shown in Fig. 6-7,41 bottom of operating stick is provided with the mating groove and is set to the mating groove The cone 43 of lower section, the cone 43 increase from the bottom end of the operating stick 41 along the first direction size.This Kind structure setting is conducive to operating stick more smoothly by the lockhole 53 by cone 43, presses through under operating stick 41 Cheng Zhong is squeezed by the cone 43 and is pushed away the lockhole side locking structure 51 is made to step down movement, until the cone 43 by the way that after the lockhole 53, the lockhole side is protruded into the mating groove under the action of third elastic component, by circular cone Body 43 limits below lockhole 53, and realization is linked.

It elaborates below with reference to set-up mode of the Fig. 3 to the first elastic component and the second elastic component:

First elastic component 9 and second elastic component 42 are located at the intermediate bulkhead two sides and are sheathed on described In operating stick 41,42 both ends of the second elastic component are respectively arranged on the intermediate bulkhead 14 and 41 top of operating stick End cap in；The elastic acting force of second elastic component 42 is greater than the elastic acting force of first elastic component 9, this structure Setting, after the operating stick 41 supports 13 to be linked by the formation of locking structure 51 with contact, the operating stick 41 is the It drives the contact to support that 13 move up under two elastic components, 42 active force, contacts moving contact 11 with static contact 13；And it is operating Bar and contact support after releasing cooperation that the contact supports that 13 can drive the moving contact 11 under 9 active force of the first elastic component It is separated with static contact 12.

It elaborates below with reference to the set-up mode of Fig. 2-6 pairs of electrical leakage tripping devices:

The electrical leakage tripping device 3 includes along the slidable elastic push rod 31 of the second direction, and the driving end 30 is set It sets on the elastic push rod 31, the locking structure 51 cooperates through one end that the contact is supported and the elastic push rod 31 Connection, the elastic push rod 31 are the third elastic component, provide for locking structure and cooperate the active force contacted with driving structure, It is further preferred that the electrical leakage tripping device 3 further include electromagnetic coil and be set in the electromagnetic coil and with the bullet Property the sensing iron core that links of mandril 31, be provided with for controlling 3 trip action of electrical leakage tripping device in the jack body 1 Control circuit board 8, control command can be issued when control circuit board 8 detects leakage current signal, to drive electric leakage de- The elastic push rod retracting action of buckle mechanism 3, to drive the left end of locking structure 51 in a second direction to move by elastic push rod 31 And step down to operating stick 41, so that the mating groove of the operating stick 41 and conical sections is detached from the lockhole of locking structure 51, solution It except being linked between operating stick and locking structure, finally separates dynamic and static contact, realizes that the earth leakage protective of floor socket outlet is made With in addition, the elastic push rod 31 is used as third elastic component towards described second when the electrical leakage tripping device 3 is not triggered The right end bullet in direction stretches movement, to drive the lockhole side of locking structure 51 and the mating groove holding of operating stick 41 that can be abutted against Touching, triggering accurately and timely, cooperate reliable transmission, and safety is good.

As shown in fig. 6, annular groove 32 is provided on the elastic push rod 31, the respective end molding of the locking structure 51 There is the socket 54 being interspersed in the annular groove 32,54 extending direction of socket is parallel to the first direction, this structure Setting makes the locking structure 51 that contact be followed to support along the first direction by the socket 54 and the cooperation of annular groove 32 It moves synchronously, and without departing from elastic push rod, ensures that the locking structure 51 with elastic push rod 31 described second Being linked on direction, it is simple in sturcture, ingenious in design.

It is illustrated below with reference to the working principle of Fig. 2-5 pairs of floor socket outlet device:

When floor socket outlet normal use, the operating stick 41 is linked with locking structure 51, and in the second elastic component 42 Active force under with moving contact support 13 on moving contact 11 and static contact 12 contact, realize circuit conducting, when occur electric leakage therefore When barrier, drives the locking structure 51 to release with operating stick 41 by electrical leakage tripping device 3 and be linked, to make the operation Bar 41 supports that 13 are separated from each other with the contact, and at this moment, the contact support 13 is under the action of the first elastic component 9 described in drive Moving contact 11 and static contact 12 separate, and disconnect circuit to realize earth leakage protective.

Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or It changes among the protection scope created still in the utility model.

Claims (10)

1. a kind of floor socket outlet device with creepage protection function, the jack body including being rotatably set to pedestal (2) (1), it is characterised in that: static contact (12), the first elastic component (9) are provided in the jack body (1), in first elasticity The lower moving contact (11) far from the static contact of part (9) effect, and the driving moving contact (11) overcome first elastic component Active force contact the operating mechanism (4) of the static contact (12), and be set to the operating mechanism (4) and the moving contact (11) interlocking mechanism (5) between；The interlocking mechanism (5), which has, makes the operating mechanism (4) to link with the moving contact Lock state, and the operating mechanism (4) and the moving contact is made to be detached from the unlocked state of cooperation；

Further include the electrical leakage tripping device (3) for being set to the jack body, the electrical leakage tripping device (3) include with it is described The driving end (30) of latch mechanism (5) linkage, described in the driving end (30) drives when the electrical leakage tripping device (3) is triggered Interlocking mechanism (5) is in the unlocked state so that the moving contact (11) first elastic component effect under with institute State static contact (12) separation.

2. according to claim 1 with the floor socket outlet device of creepage protection function, it is characterised in that: including being slidably installed (13) are supported in the contact of the jack body (1), and the moving contact (11) is set to the contact and supports (13), the stationary contact The corresponding moving contact of head (12) is arranged on the intermediate bulkhead (14) in the jack body (1), first elastic component (9) Being set to the contact supports can to drive the contact to support the moving contact on (13) along the between (13) and the intermediate bulkhead One direction moves away from the static contact；The operating mechanism (4) includes moving to be extended through in described along the first direction Spacing board (14) and the contact support the operating stick (41) between (13).

3. according to claim 2 with the floor socket outlet device of creepage protection function, it is characterised in that: the interlocking mechanism (5) include:

Fit structure (52) is set to the operating stick (41) periphery；

Locking structure (51) is movably arranged along the second direction perpendicular to the first direction and supports (13) in the contact, There is the sticking department with the fit structure (52) cooperation to link with the operating stick (41) along the second direction, and, The freedom portion for allowing the operating stick (41) to move freely；

Third elastic component is connected with the locking structure (51), sticking department described in the elastic power drive of the third elastic component with Fit structure (52) cooperation.

4. with the floor socket outlet device of creepage protection function according to Claims 2 or 3, it is characterised in that: the operation Mechanism (4) include the operating stick (41) and be set between the jack body (1) and the operating stick (41) second Elastic component (42), when the operating stick (41) is supported to cooperate by the interlocking mechanism and the contact, second elastic component (42) operating stick is driven to drive the moving contact (11) to contact with the static contact (12) along the first direction.

5. according to claim 3 with the floor socket outlet device of creepage protection function, it is characterised in that: the electric leakage tripping Mechanism (3) includes along the slidable elastic push rod of the second direction (31), and the driving end (30) is arranged in the elastic top On bar (31), the locking structure (51) is cooperatively connected through one end that the contact is supported and the elastic push rod (31), institute Stating elastic push rod (31) is the third elastic component.

6. according to claim 5 with the floor socket outlet device of creepage protection function, it is characterised in that: the elastic push rod On be provided with annular groove (32), the respective end of the locking structure (51) form is interspersed in the annular groove (32) insert Mouth (54), socket (54) extending direction are parallel to the first direction.

7. according to claim 6 with the floor socket outlet device of creepage protection function, it is characterised in that: the electric leakage tripping Mechanism (3) further includes electromagnetic coil and is set in the electromagnetic coil and the sensing iron with the elastic push rod (31) linkage Core, the interior control circuit board (8) being provided with for controlling the electrical leakage tripping device (3) trip action of the jack body (1).

8. with the floor socket outlet device of creepage protection function according to any one of claim 5-7, it is characterised in that: institute Stating fit structure (52) is the mating groove for being opened in the operating stick (41), and the locking structure (51) has the permission behaviour The mating groove is protruded under the action of the third elastic component in the lockhole (53) passed through as bar, lockhole (53) side In.

9. according to claim 8 with the floor socket outlet device of creepage protection function, it is characterised in that: the operating stick (41) cone (43) that bottom is provided with the mating groove and is set to below the mating groove, the cone (43) Increase from the bottom end of the operating stick (41) along the first direction size, the cone (43) fits through the lock Hole.

10. according to claim 4 with the floor socket outlet device of creepage protection function, it is characterised in that: first bullet Property part (9) and second elastic component (42) are located at the intermediate bulkhead two sides and are sheathed on the operating stick (41), Second elastic component (42) both ends be respectively arranged on the intermediate bulkhead and the end cap on the operating stick (41) top in；Institute The elastic acting force for stating the second elastic component (42) is greater than the elastic acting force of first elastic component (9).