CN105996930A

CN105996930A - Mop dewatering device

Info

Publication number: CN105996930A
Application number: CN201610437619.8A
Authority: CN
Inventors: 陈铭鸿
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-06-20
Filing date: 2016-06-20
Publication date: 2016-10-12

Abstract

The invention discloses a mop dewatering device which comprises a motor (10), a supporting base (15), a connection support base (9), a round table (8), a mop rod clamping device, a mop head clamping device and a mop head clamping driving device. The mop head clamping driving device comprises a pressing block (7), a gear (5) and an elastic piece (6), one end of the pressing block (7) is fixedly connected with the mop head clamping device in the vertical direction, the side wall of the other end of the pressing block (7) is an inclined face (4), the gear (5) is rotationally connected to the round table (8), one end of the elastic piece (6) is hinged to the round table (8), the other end of the elastic piece (6) is in clamped connection with a gear groove of the gear (5), and the inclined face (4) is a gear face meshed with the gear (5). By the adoption of the structure, work noise is greatly lowered, a mop can be wrung drier, and the ground can be cleaned more conveniently. Besides, meshing transmission of the gear inclined face on the pressing block and the gear is adopted in the mop head clamping driving device, the structure is simple, and operation is convenient.

Description

Mop dewatering equipment

Technical field

The present invention relates to field of mechanical technique, be especially the mop dewatering equipment of a kind of moisture content on drying of mop.

Background technology

At present, having various mop on the market, have flat mop, collodion mop and strip mop, people can select different types of mop according to different use occasions, and wherein strip mop application is the most extensive.The mode of wringing out of traditional strip mop is very painstaking, it must twist the most round about mop could mop wring, but due to the restriction of manpower, the effect wrung out is the most bad.Therefore, the mop-whirling barrel that a kind of foot is stepped on is occurred in that the most again.

The patent of invention " mop cleaning and drying drum " of Publication No. CN101926634A as disclosed on State Intellectual Property Office website, it discloses staving, water rejection box, stirring plate, footstep mechanism, footstep mechanism and water rejection box, stirring plate through transport, footstep mechanism includes riding boogie board, built-up gear, bevel gear, tooth bar, stirring plate gear, base；Riding boogie board is provided with the sector gear with double cog, and built-up gear is to be connected as a single entity by bevel gear wheel, small cylinder gear, rotating shaft, and the inner tines of sector gear engages with small cylinder gear, and the outside tooth of sector gear engages with tooth bar, and tooth bar engages with stirring plate gear.But, the power offer source of the spin dryer tube of said structure is the foot of people, and the degree of wringing out of mop is that the force with operator has proportional relation, and if the power that i.e. operator is applied is big, what mop was twisted does, and it is cleaner that ground is just dragged；But being as the fatigue of operator, the power being applied spin dryer tube tapers into, it is wetter that mop is just twisted, thus ground just process is the cleanest.

To this, the patent " electric mop drying barrel " of Publication No. CN201683869 is disclosed on State Intellectual Property Office website, it discloses dynamic equipment, staving, drive link, dehydration basket, dynamic equipment is electric power device, it is positioned at staving side bottom to cave inward place, electric power device includes accumulator, switch, motor, outlet, drive, accumulator is positioned at bottom staving, motor is positioned at staving side bottom and caves inward top position, place, drive is plate-like gear, coaxially connected with drive link, driving wheel tooth part is connected with motor, outlet is positioned at the middle side edge of staving, switch is positioned at bottom the side of staving.But, the electric mop drying barrel of this structure there is the problem that

1) when the motor being positioned at staving side bottom brings into operation, mophead in drive staving and staving is rotated together, thus realize the purpose that mophead is dried, but, moisture content is dried by mophead under the influence of centrifugal force, motor speed is the biggest, the drying degree of mop is the highest, therefore, when maching wringing tube is started working, motor is in the duty of high speed rotating all the time, on the one hand operating noise is increased, on the other hand, once motor speed declines, moisture content on mophead just can get rid of out, mop is twisted and is not done, just it is unfavorable for the cleaning to ground；

2) additionally, mop needs operator hand-held in the bar portion of mop when carrying out water dumping, and vibrations can be produced when mophead rotates when, this vibrations can be delivered to operator on hand by mop rod portion, thus on the one hand affect the use state of operator, on the other hand also affecting the mop stability when carrying out water dumping, the moisture content affecting mop further dries degree.

Summary of the invention

The technical problem to be solved is to provide a kind of can fully remove that moisture content, noise be little and the mop dewatering equipment of stable operation.

For solving above-mentioned technical problem, the mop dewatering equipment that the present invention provides, it includes motor, supports seat, connection bearing, round platform, mop rod clamping device, mophead clamping device and mophead driving clamping device；The described bottom supporting seat is U shape, motor is arranged on the output shaft of support seat inner bottom part and motor and is in transmission connection with being connected bearing lower end by drive mechanism, the bottom welding of the upper end and round platform that connect bearing is fixed and is connected, and the bottom connecting bearing and the lower rotation supporting seat are connected；Described mophead clamping device is connected to round platform upper end, and mop rod clamping device is connected to support the top of seat；Described mophead driving clamping device includes briquetting, gear and shell fragment, one end of briquetting is fixing with mophead clamping device in the vertical direction to be connected, the sidewall of the other end is inclined-plane, the incline direction on inclined-plane is gradually the most close to the center of circle of round platform, pinion rotation is connected on round platform, one end of shell fragment is hinged with round platform, and the other end and the teeth groove clamping of gear, the inclined-plane of briquetting is the flank of tooth that can engage with gear.

Described mophead clamping device includes the most uniform four group clamp assembly, and the lower slide of four groups of clamp assemblies coordinates in round platform, and top is clamped or disengagement with mophead by link gear.

Described often group clamp assembly includes arc clamping head, slide bar, spring and guide rod, and the cylindrical sidewall of round platform is provided with radially-directed hole, and guide rod is positioned at one end of radially-directed hole and guide rod and threadeds at the bottom of the hole in radially-directed hole；Round platform be provided with axially through strip radially slide opening, sliding bar coordinates in strip radially slide opening, and the lower end of slide bar is sliding Being automatically connected on guide rod, the upper end of slide bar is fixing with arc clamping head to be connected, and one end of briquetting is connected with slide bar；Described spring housing is connected on guide rod, and one end of spring pushes against with slide bar, and the other end pushes against at the bottom of the hole, radially-directed hole on round platform.

Arc clamping head in described four groups of clamp assemblies is divided into I and two clamping II of two clampings, wherein the two ends of clamping I respectively have raised line, clamping II two ends respectively have the groove matched with raised line, and four arc clamping heads are along the circumferential direction followed successively by clamping I, clamping II, clamping I and clamping II layout.

Described link gear includes two arc shrouds, two arc loop bars and four connecting rods, two arc shrouds and two arc loop bar interlaced arrangement, and is socketed two-by-two；The lower end of four connecting rods is respectively fixedly connected with on the lateral wall of four slide bars, and the upper end of connecting rod is connected with fixing at the axial centre of arc shrouds or at the axial centre of arc loop bar.

It is additionally provided with locking device between bottom the U shape of described round platform and support seat.

Described round platform is the frustum that upper end diameter is less than lower end diameter, and locking device includes the latch assembly that at least two groups are the most uniform；Described often group latch assembly includes latch segment, horizontal plate and gripper shoe, one end of latch segment matches with the outer cone sidewall of frustum, the other end is fixing with one end of horizontal plate to be connected, the other end of horizontal plate is slidably connected by bolt and nut and is locked on support seat, the lower end of described gripper shoe is connected with supporting seat, and upper end is positioned under horizontal plate.

Slided by bolt and nut and be locked on support seat and refer in one end of described horizontal plate, support seat and be provided with the inclined hole of through support seat, the incline direction of inclined hole is gradually the most close to the outward flange supporting seat, and it is interior and pass through nut check that one end of horizontal plate is slidably connected at inclined hole by bolt.

Described mop rod clamping device includes movable block, arc pendulum rod, arc latch, extension spring and two rubber semi-rings；Movable block wherein one jiao with to support one jiao of seat top hinged, arc latch is fixed on the end face of movable block and extrados has teeth groove, and one end of arc pendulum rod is hinged with support seat end face, and the intrados of the other end is provided with the lobe matched with teeth groove；One end of described extension spring is connected with the end face supporting seat, and the other end is connected with arc pendulum rod；Being equipped with cross section on the side that described support seat is relative with movable block is semicircular groove, and two rubber semi-rings are bonded in two grooves respectively, and are equipped with multiple protruding head outwardly on the intrados of two rubber semi-rings.

After using above structure, the present invention compared with prior art, has the advantage that

1) being clamped by mophead clamping device and mop rod clamping device respectively due to head and the bar portion of mop, when mophead rotates along with the startup of motor, bar portion is fixed, thus realizes wringing out of mophead；Therefore, on the one hand motor is without high speed rotating, thus is substantially reduced operating noise；On the other hand by the way of wringing out, mophead is anhydrated, more more efficient than the mode dried, and twist more dry, advantageously in the cleaning to ground；It addition, mophead driving clamping device have employed the engaged transmission on tooth inclined-plane on briquetting and gear, while making briquetting press under by external force, mophead clamping device is close to round platform center, until completing mophead to clamp, simple in construction, easy to operate；Additionally, use the structure of gear also shell fragment can pin gear and slide bar preferably to clamp mophead；

2) four clamping heads use and are staggered two-by-two and the structure of raised line and groove fit, are similar to the structure of joggle, on the one hand make clamping structure simpler, on the other hand also make clamping the compactest；Further, four clamping heads are provided with link gear, make four clamping heads to be synchronized with the movement, thus realize four clamping heads mophead can be clamped action simultaneously；

3) locking device arranged between round platform and support seat, no matter round platform is the frustum of a cone or cylinder table, the periphery wall of round platform is connected between seat with supporting by locking device, and support the setting of inclined hole on seat, also for the convenient regulation to horizontal plate, therefore, on the one hand further ensuring round platform is in level all the time, on the other hand also round platform is served certain supporting role, make this device the most firm；

4) mop rod clamping device have employed the clamping having between the arc pendulum rod of lobe and the arc latch with teeth groove, make mop rod clamping device open with close simpler, more convenient to operate；And between movable block and support seat top, it is provided with two rubber semi-rings, make mop rod after putting among two rubber semi-rings, by the characteristic that the coefficient of friction of quality of rubber materials is big, mop rod is made to be clamped on more securely in clamping device, the protruding head outwardly of two rubber half ring inner surfaces simultaneously, also be to further increase the clamping force to mop rod, thus further ensure mophead when rotating mop rod will not concomitant rotation, and then make mophead to wring out effect more preferable.

Accompanying drawing explanation

Fig. 1 is the structural representation of mop dewatering equipment of the present invention.

Fig. 2 is that the present invention removes support seat and the structural representation of motor.

Fig. 3 is the sectional structure schematic diagram of Fig. 2.

Fig. 4 is the structural representation in A-A direction in Fig. 3.

Fig. 5 is the structural representation of link gear in the present invention.

Fig. 6 is the mop rod clamping device structural representation when opening in the present invention.

Fig. 7 is mop rod clamping device structural representation when closed in the present invention.

Wherein: 1, mop rod；2, mophead；3, slide bar；4, inclined-plane；5, gear；6, shell fragment；7, briquetting；8, round platform；9, bearing is connected；10, motor；11, clamping I；12, clamping II；13, arc shrouds；14, arc loop bar；15, seat is supported；16, latch segment；17, horizontal plate；18, inclined hole；19, gripper shoe；20, connecting rod；21, raised line；22, groove；23, radially-directed hole；24, strip radially slide opening；25, guide rod；26, spring；27, extension spring；28, movable block；29, arc pendulum rod；30, lobe；31, rubber semi-ring；32, teeth groove；33, arc latch.

Detailed description of the invention

With detailed description of the invention, the present invention is described in more detail below in conjunction with the accompanying drawings.

From the structural representation of the mop dewatering equipment of the present invention shown in Fig. 1～Fig. 7, it includes motor 10, supports seat 15, connection bearing 9, round platform 8, mop rod clamping device, mophead clamping device and mophead driving clamping device.The described bottom supporting seat 15 is U shape, motor 10 is arranged on the output shaft of support seat 15 inner bottom part and motor 10 and is in transmission connection with being connected bearing 9 lower end by drive mechanism, the bottom of the upper end and round platform 8 that connect bearing 9 is fixed and is connected, and the bottom connecting bearing 9 and the lower rotation supporting seat 15 are connected；Described mophead clamping device is connected to round platform 8 upper end, and mop rod clamping device is connected to support the top of seat 15.Described mophead driving clamping device includes briquetting 7, gear 5 and shell fragment 6, one end of briquetting 7 is connected with mophead clamping device in the vertical direction, the sidewall of the other end is inclined-plane 4, the incline direction on inclined-plane 4 is gradually the most close to the center of circle of round platform 8, gear 5 is rotatably connected on round platform 8, one end of shell fragment 6 is hinged with round platform 8, and the other end and the teeth groove clamping of gear 5, the inclined-plane 4 of briquetting 7 is the flank of tooth that can engage with gear 5.It is known that be fixedly connected with rotation seat on the bottom supported in seat 15 from accompanying drawing 1, the upper end of rotation seat is connected with the lower rotation being connected bearing 9 by bearing.

Described mophead clamping device includes the most uniform four group clamp assembly, and the lower slide of four groups of clamp assemblies coordinates in round platform 8, and top is clamped by link gear with mophead 2 or disengages.

Described often group clamp assembly includes arc clamping head, slide bar 3, spring 26 and guide rod 25, the cylindrical sidewall of round platform 8 Being provided with radially-directed hole 23, guide rod 25 is positioned at one end of radially-directed hole 23 and guide rod 25 and threadeds at the bottom of the hole in radially-directed hole 23.Round platform 8 be provided with axially through strip radially slide opening 24, slide bar 3 is slidably fitted in strip radially slide opening 24, and the lower slide of slide bar 3 is connected on guide rod 25, the upper end of slide bar 3 is fixing with arc clamping head to be connected, and one end of briquetting 7 is connected with slide bar 3.Described spring 26 is socketed on guide rod 25, and one end of spring 26 pushes against with slide bar 3, and the other end pushes against at the bottom of the hole, radially-directed hole 23 on round platform 8.Strip radially slide opening 24 is actually made up of two parts elongate holes, the direction of its strip is the radial direction of round platform, its degree of depth be round platform axially through, near the counterbore being equivalent to strip of round platform upper surface, near round platform lower surface for strip through hole.

Arc clamping head in described four groups of clamp assemblies is divided into two clampings I 11 and two clampings II 12, wherein the two ends of clamping I 11 respectively have raised line 21, clamping II 12 two ends respectively have the groove 22 matched with raised line 21, and four arc clamping heads are along the circumferential direction followed successively by clamping I 11, clamping II 12, clamping I 11 and clamping II 12 and arrange.

Described link gear includes 13, two arc loop bars 14 of two arc shrouds and four connecting rods 20, two arc shrouds 13 and two arc loop bar 14 interlaced arrangement, and is socketed two-by-two.The lower end of four connecting rods 20 is respectively fixedly connected with on the lateral wall of four slide bars 3, and the upper end of connecting rod 20 is connected with fixing at the axial centre of arc shrouds 13 or at the axial centre of arc loop bar 14.

It is additionally provided with locking device between bottom the U shape of described round platform 8 and support seat 15.In the present embodiment, described round platform 8 is less than the frustum of lower end diameter for upper end diameter, and locking device includes the latch assembly that at least two groups are the most uniform.Described often group latch assembly includes latch segment 16, horizontal plate 17 and gripper shoe 19, one end of latch segment 16 matches with the outer cone sidewall of frustum, the other end is fixing with one end of horizontal plate 17 to be connected, the other end of horizontal plate 17 is slidably connected by bolt and nut and is locked on support seat 15, the lower end of described gripper shoe 19 is connected with supporting seat 15, and upper end is positioned at horizontal plate 17 times.

Slided by bolt and nut and be locked on support seat 15 and refer in one end of described horizontal plate 17, support seat 15 and be provided with the inclined hole 18 of through support seat 15, the incline direction of inclined hole 18 is gradually the most close to the outward flange supporting seat 15, and it is interior and pass through nut check that one end of horizontal plate 17 is slidably connected at inclined hole 18 by bolt.

Described mop rod clamping device includes movable block 28, arc pendulum rod 29, arc latch 33, extension spring 27 and two rubber semi-rings 31.Movable block 28 wherein one jiao with to support one jiao of seat 15 top hinged, arc latch 33 is fixed on the end face of movable block 28 and extrados has teeth groove 32, one end of arc pendulum rod 29 is hinged with support seat 15 end face, and the intrados of the other end is provided with the lobe 30 matched with teeth groove 32.One end of described extension spring 27 is connected with the end face supporting seat 15, and the other end is connected with arc pendulum rod 29.Being equipped with cross section on the side that described support seat 15 is relative with movable block 28 is semicircular groove, and two rubber semi-rings 31 are bonded in two grooves respectively, and are equipped with multiple protruding head outwardly on the intrados of two rubber semi-rings 31.

The work process of the present invention is as follows: first passes through the locking device between round platform 8 and support seat 15 and adjusts the position of round platform 8, makes round platform 8 be maintained at the state of level；Now, supporting the arc pendulum rod 29 at seat 15 top in opened condition, movable block 28 is the most in opened condition；Then by mop embedding device, mop rod 1 puts into two rubber semi-rings 31, mophead 2 puts into four arc clamping heads, movable block 28 is closed up, and pull on extension spring 27, the lobe 30 making arc pendulum rod 29 inwardly straighten to arc pendulum rod 29 is connected in the teeth groove 32 on arc latch segment 33, so, completes the pinching action of mop rod 1；Then, briquetting 7 is applied external force, briquetting 7 is forced to move down, briquetting 7 moves down along slide bar 3 when not in contact with strip radially slide opening 24, during until the inclined-plane 4 of briquetting 7 touches gear 5, under the gear effect with flank engagement, continuing to move down briquetting 7 will force slide bar 3 to slide to the center of round platform 9, now, the spring 26 being socketed on guide rod 25 is compressed, the arc clamping head of slide bar 3 upper end is close to round platform center, under the effect of link gear, its excess-three group clamp assembly is also the most close to round platform center, until mophead 2 being locked in arc clamping head；Now, under the shell fragment 6 effect with gear 5, briquetting 7 can't move up, thus realizes locking the purpose of mophead；Then, actuating motor 10, motor 10 output shaft rotarily drive connection bearing 9 and round platform 8 rotates, same under the effect of mophead clamping device drive mophead 2 to rotate, but mop rod 1 does not rotate, thus realizes mophead 2 and wring out the purpose of moisture content；Finally, after mophead anhydrates, stop motor 10, shell fragment 6 is pushed aside to opposite direction, briquetting 7 and slide bar 3 eliminate restraining forces, and under the effect of the spring force of spring 26, slide bar 3 slides to the edge direction of round platform 8, and drive four arc clamping heads to expand outwardly under the effect of link gear, unclamp the clamping to mophead 2；And supporting seat 15 top, arc pendulum rod 29 is turned out, makes lobe 30 disengage teeth groove 32, open movable block 28, take out mop rod 1；So far, the operation of anhydrating of whole mop is completed.

The invention is not limited in structures described above, wherein: first, round platform 8 can also be cylinder table, and correspondingly latch segment 16 is vertical circular arc inner concave with the end face of the sidewall contact of round platform 8；Second, four groups of clamp assemblies, due to the attachment structure of link gear, as long as the one group of clamp assembly being connected with mophead driving clamping device is provided with spring, can not use spring in its excess-three group clamp assembly；3rd, in order to make connection bearing 9 more firm and steady with the connection of round platform 8, the structure of some reinforcements can be set up in both junctions；4th, the connection of the upper end of gripper shoe 19 and horizontal plate 17 can increase the sliding connection structure of slide rail and chute, and the side of same gripper shoe 19 can also increase the sliding connection structure of slide rail and chute with the connection supporting seat 15；5th, the output shaft of motor and the transmission connecting structure being connected bearing lower end, can be meshed transmission gear, can be belt wheel transmission；Etc..Within the above structure each falls within protection scope of the present invention.

Claims

1. a mop dewatering equipment, it is characterised in that: it includes motor (10), supports seat (15), connection bearing (9), round platform (8), mop rod clamping device, mophead clamping device and mophead driving clamping device；The bottom of described support seat (15) is U shape, motor (10) is arranged on the output shaft of support seat (15) inner bottom part and motor (10) and is in transmission connection with being connected bearing (9) lower end by drive mechanism, connects bearing (9) upper end is fixing with the bottom welding of round platform (8) to be connected, and the bottom connecting bearing (9) is connected with the lower rotation supporting seat (15)；Described mophead clamping device is connected to round platform (8) upper end, and mop rod clamping device is connected to support the top of seat (15)；Described mophead driving clamping device includes briquetting (7), gear (5) and shell fragment (6), one end of briquetting (7) is connected with mophead clamping device in the vertical direction, the sidewall of the other end is inclined-plane (4), the incline direction on inclined-plane (4) is gradually the most close to the center of circle of round platform (8), gear (5) is rotatably connected on round platform (8), one end of shell fragment (6) is hinged with round platform (8), the other end and the teeth groove clamping of gear (5), the inclined-plane (4) of briquetting (7) is the flank of tooth that can engage with gear (5).

2. according to the mop dewatering equipment described in claim 1, it is characterised in that: described mophead clamping device includes edge Four groups of clamp assemblies that circumferencial direction is uniform, the lower slide of four groups of clamp assemblies coordinates in round platform (8), and top is clamped by link gear with mophead (2) or disengages.

3. according to the mop dewatering equipment described in claim 2, it is characterised in that: described often group clamp assembly includes that arc presss from both sides Tight head, slide bar (3), spring (26) and guide rod (25), the cylindrical sidewall of round platform (8) is provided with radially-directed hole (23), and guide rod (25) is positioned at one end of radially-directed hole (23) and guide rod (25) and threadeds at the bottom of the hole of radially-directed hole (23)；Round platform (8) be provided with axially through strip radially slide opening (24), slide bar (3) is slidably fitted in strip radially slide opening (24), and the lower slide of slide bar (3) is connected on guide rod (25), the upper end of slide bar (3) is fixing with arc clamping head to be connected, and one end of briquetting (7) is connected with slide bar (3)；Described spring (26) is socketed on guide rod (25), and one end of spring (26) pushes against with slide bar (3), the other end pushes against at the bottom of radially-directed hole (23) hole on round platform (8).

4. according to the mop dewatering equipment described in claim 3, it is characterised in that: the arc folder in described four groups of clamp assemblies Tight head is divided into two clampings I (11) and two clampings II (12), wherein the two ends of clamping I (11) respectively have raised line (21), clamping II (12) two ends respectively have the groove (22) matched with raised line (21), and four arc clamping heads are along the circumferential direction followed successively by clamping I (11), clamping II (12), clamping I (11) and clamping II (12) and arrange.

5. according to the mop dewatering equipment described in claim 3, it is characterised in that: described link gear includes two arcs Sleeve pipe (13), two arc loop bars (14) and four connecting rods (20), two arc shrouds (13) and two arc loop bar (14) interlaced arrangement, and be socketed two-by-two；The lower end of four connecting rods (20) is respectively fixedly connected with at four slide bars (3), on lateral wall, the upper end of connecting rod (20) is connected with fixing at the axial centre of arc shrouds (13) or at the axial centre of arc loop bar (14).

6. according to the mop dewatering equipment described in claim 1, it is characterised in that: it is additionally provided with locking device between bottom the U shape of described round platform (8) and support seat (15).

7. according to the mop dewatering equipment described in claim 6, it is characterised in that: described round platform (8) is the frustum that upper end diameter is less than lower end diameter, and locking device includes the latch assembly that at least two groups are the most uniform ；Described often group latch assembly includes latch segment (16), horizontal plate (17) and gripper shoe (19), one end of latch segment (16) matches with the outer cone sidewall of frustum, the other end is fixing with one end of horizontal plate (17) to be connected, horizontal plate (17) the other end is slidably connected by bolt and nut and is locked in support seat (15), the lower end of described gripper shoe (19) is connected with supporting seat (15), and upper end is positioned under horizontal plate (17).

8. according to the mop dewatering equipment described in claim 7, it is characterized in that: slided by bolt and nut and be locked in support seat (15) and refer in one end of described horizontal plate (17), support seat (15) and be provided with the inclined hole (18) of through support seat (15), the incline direction of inclined hole (18) is gradually the most close to the outward flange supporting seat (15), and it is interior and pass through nut check that one end of horizontal plate (17) is slidably connected at inclined hole (18) by bolt.

9. according to the mop dewatering equipment described in claim 1, it is characterised in that: described mop rod clamping device includes living Motion block (28), arc pendulum rod (29), arc latch (33), extension spring (27) and two rubber semi-rings (31)；Movable block (28) wherein one jiao with to support one jiao of seat (15) top hinged, arc latch (33) is fixed on the end face of movable block (28) and extrados has teeth groove (32), one end of arc pendulum rod (29) is hinged with support seat (15) end face, and the intrados of the other end is provided with the lobe (30) matched with teeth groove (32)；One end of described extension spring (27) is connected with the end face supporting seat (15), and the other end is connected with arc pendulum rod (29)；Being equipped with cross section on the side that described support seat (15) is relative with movable block (28) is semicircular groove, two rubber semi-rings (31) are bonded in two grooves respectively, and are equipped with multiple protruding head outwardly on the intrados of two rubber semi-rings (31).