CN210387571U

CN210387571U - Track casting vehicle for vertical molding line

Info

Publication number: CN210387571U
Application number: CN201920945085.9U
Authority: CN
Inventors: 李鹏
Original assignee: Qingdao Wanhengda Machinery Equipment Co ltd
Current assignee: Qingdao Wanhengda Machinery Equipment Co ltd
Priority date: 2019-06-21
Filing date: 2019-06-21
Publication date: 2020-04-24
Anticipated expiration: 2029-06-21

Abstract

The utility model discloses a track casting car for a vertical molding line, which belongs to the technical field of casting equipment and comprises a car body support, wherein a track is arranged at the bottom of the car body support, a plurality of track wheels are rotationally connected at the position of the bottom of the car body support corresponding to the track, the track wheels are all connected on the track in a sliding manner, the top of the car body support is rotationally connected with a containing barrel, a containing groove is formed in the side surface of the containing barrel, a dumping opening is formed in one side of the containing barrel, and the car body support is connected with a transmission mechanism capable of driving the containing barrel to rotate; the splendid attire bucket is close to the pouring opening and keeps away from the fixedly connected with of position department of splendid attire groove one side and emptys the cell body, and the position department fixedly connected with that body support corresponds splendid attire bucket one side emptys the hopper, and when the splendid attire bucket was rotatory to the one end of emptying the cell body and keeping away from the splendid attire bucket was located and emptys hopper top position department, liquid in the splendid attire bucket can follow the pouring opening and flow in and emptys the hopper along empting the cell body, the utility model discloses have.

Description

Track casting vehicle for vertical molding line

Technical Field

The utility model belongs to the technical field of the technique of equipment of pouring and specifically relates to a car is pour with track to perpendicular molding line.

Background

At present, the molten iron casting machine is mainly used for casting mold flow coating, box turning, casting cleaning and other processes when a casting shop produces large and medium castings, and is indispensable equipment for mechanized production of the casting shop. The molten iron casting machine has the following characteristics: by adopting the design of a chain and sprocket transmission structure, the 360-degree forward and reverse continuous or inching electric turnover of the casting mold can be realized, the casting mold can be stopped at follow-up, the rotating speed is low, and the eccentric torque resistance is large; the structural design of the distance between the adjustable chain wheels is adopted, independent bidirectional continuous electric adjustment distance of the left and right double chains can be realized according to different casting molds and sand box sizes, the application range is wide, and the field practicability is strong; the operation control adopts a combined button integrated structure form, and the mobile operation is flexible and convenient and has reliable follow-up control performance; the whole machine has compact and reasonable structure, good rigidity, large safety factor, stable operation and safe and reliable work.

In the prior art, reference can be made to a Chinese utility model patent with an authorization publication number of CN207127249U, which discloses a movable pouring device and a molten iron casting machine, and relates to the technical field of suspension equipment, wherein the movable pouring device comprises a pull rod, a lifting mechanism, a movable lifting lug and a pouring bag; one end of the pull rod is connected with the traveling crane capable of moving horizontally, the other end of the pull rod is connected with one end of the lifting mechanism, the other end of the lifting mechanism is connected with the movable lifting lug, and the pouring bag is connected to the movable lifting lug; the lifting mechanism can drive the pouring bag to move along the vertical direction through the movable lifting lug.

The above prior art solutions have the following drawbacks: present subsides water pouring machine uses the mode of hanging to remove more, leads to removing the mechanism of pouring of in-process pouring machine to have certain rocking, and stable needs the dead time, leads to pouring efficiency and reduces, is unfavorable for pouring the work of pouring of the less mould in hole.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a perpendicular car is pour with track of mo (u) lding line can realize stablizing the effect that the efficient pour the less mould in hole.

The above technical purpose of the present invention can be achieved by the following technical solutions:

a track pouring vehicle for a vertical molding line comprises a vehicle body support, wherein a track is arranged at the bottom of the vehicle body support, a plurality of track wheels are rotatably connected at the bottom of the vehicle body support at positions corresponding to the track, the track wheels are all connected to the track in a sliding manner, a containing barrel which is perpendicular to the length direction of the track is rotatably connected at the top of the vehicle body support, a containing groove is formed in the side surface of the containing barrel, a dumping opening is formed at a position of the containing barrel, corresponding to one side of the containing groove, and a transmission mechanism capable of driving the containing barrel to rotate is connected at a position of the vehicle body support corresponding to the end part of the containing barrel; a pouring groove body is fixedly connected to the position, close to the pouring opening, of the containing barrel, and far away from the containing groove, and when the containing barrel rotates, molten iron in the containing barrel can flow into the pouring groove body from the pouring opening; the automobile body support corresponds the hopper is emptyd to the fixedly connected with of position department of splendid attire bucket one side, works as the splendid attire bucket rotates extremely it keeps away from to empty the cell body the one end of splendid attire bucket is located when empting hopper top position department, liquid in the splendid attire bucket can be followed the pouring opening is followed it flows into to empty the cell body in the hopper to empty.

Through adopting above-mentioned scheme, when pouring, will pour the car and push away to the position department just pouring the hole to the mould, rotatory splendid attire bucket, make the molten iron in the splendid attire bucket can follow the pouring opening and flow in pouring the hopper via empting the cell body, finally flow in the hole of pouring of mould through the lower port of pouring the hopper, compare with traditional equipment of pouring that hangs, this car of pouring can avoid equipment to rock the phenomenon of the unable alignment hole of pouring that leads to at the in-process of pouring that carries out a plurality of moulds, can realize the efficient and pour the function of pouring to the less mould in hole of pouring.

The utility model discloses further set up to: the transmission mechanism comprises a transmission cylinder which is rotatably connected to the bottom of the vehicle body support, the transmission cylinder can rotate in the longitudinal section, and a piston rod of the transmission cylinder is rotatably connected to the edge of the end face of the containing barrel.

Through adopting above-mentioned scheme, when the rotatory splendid attire bucket of needs carries out the molten iron and emptys, the accessible is released transmission cylinder's piston rod and is realized the rotation to the splendid attire bucket, emptys the back that finishes, withdraws transmission cylinder's piston rod, just can realize revolving the initial position back with the splendid attire bucket.

The utility model discloses further set up to: and a fixing mechanism capable of fixing the position of the vehicle body support is arranged at the position of the vehicle body support, which is close to the track wheels.

Through adopting above-mentioned scheme, when pouring the car and every removing the position department that corresponds above the hole of pouring, all need the stablizing accuracy and the stability of pouring in order to ensure, at this moment, fix pouring car and orbital relative position through fixed establishment, just can realize will pouring the effect that the car is stablized.

The utility model discloses further set up to: the fixing mechanism comprises a fixing sliding block which is connected to the bottom of the vehicle body support in a sliding mode and corresponds to the position above the track, the fixing sliding block can slide in the vertical direction, a plurality of vertically arranged fixing slots are formed in the position, corresponding to the position below the fixing sliding block, of the top of the track, all the fixing slots are arranged in the length direction of the track, and the fixing sliding block can be inserted into the fixing slots when sliding downwards.

Through adopting above-mentioned scheme, when needs stall steadily pour the car, peg graft in fixed slot with fixed slider downwards, just can realize fixing the effect at certain position of track with pouring the car to realize the effect of stable fixed car of pouring.

The utility model discloses further set up to: the top of the fixed sliding block is fixedly connected with a handle.

Through adopting above-mentioned scheme, set up the handle and can avoid operating personnel need the inconvenient of bowing when needs operate fixed slider to improve operating personnel and stop or remove the convenient degree when pouring the car, improve the availability factor.

The utility model discloses further set up to: and a plurality of mould grooves perpendicular to the length direction of the rail are formed in the position, corresponding to the lower part of the dumping hopper, of the top of the rail, and all the mould grooves are arranged along the length direction of the rail.

Through adopting above-mentioned scheme, place the mould in the mould groove, realization mould position that on the one hand can be better and the mutual correspondence of the position that the car can stall steadily pour, on the other hand also can further promote the stability of mould, prevent that the mould from being touch the removal and leading to pouring the effect not good pouring the car removal in-process.

The utility model discloses further set up to: the bottom of the car body support corresponds to a position fixedly connected with edge below the containing barrel, a blocking beam is arranged in the length direction of the containing barrel, a clamping block is fixedly connected with a position of the containing groove and is far away from the outer side of the containing barrel, and when the dumping baffle is positioned above the dumping hopper, the clamping block can abut against the blocking beam.

Through adopting above-mentioned scheme, the fixture block can be when the splendid attire bucket is rotatory to the suitable position butt in blocking the roof beam to stabilize the position of splendid attire bucket, prevent that the rotatory excessive raw materials that leads to empting the too fast phenomenon that splashes of raw materials that leads to of speed of splendid attire bucket, thereby the efficiency that the guarantee was emptyd.

The utility model discloses further set up to: and an elastic protective layer is fixedly connected to one side surface of the blocking beam close to the clamping block.

Through adopting above-mentioned scheme, at the fixture block in-process that collides with the stop beam many times, the protective layer can disperse the fixture block to the power that stops the beam to the damage that the messenger stopped that the beam received reduces, thereby prolongs the life who stops the beam.

The utility model discloses further set up to: the side wall of the containing barrel, which is close to the containing groove, is provided with a plurality of through holes arranged in an array.

Through adopting above-mentioned scheme, when adding the molten iron in to the splendid attire bucket, need ensure that the atmospheric pressure in the splendid attire bucket is stable in order to realize that the efficient molten iron adds, the through-hole can effectively play the effect of balanced atmospheric pressure to the high efficiency that the guarantee molten iron added goes on.

The utility model discloses further set up to: the automobile body support bottom corresponds track top position department sets up the slider groove of vertical setting, fixed slider sliding connection in the slider groove, the joint groove of vertical setting is seted up at fixed slider top, fixed slider is close to the position department of joint tank bottom rotates and is connected with the joint piece, the joint piece can be at the longitudinal section internal rotation, the joint piece can accomodate in the joint groove, the joint piece is close to the lateral wall top fixedly connected with spring in joint groove, the spring is kept away from the one end fixed connection of joint piece in fixed slider is close to the position department in joint groove, the spring can give the joint piece is applyed to keeping away from the power that joint groove direction removed.

Through adopting above-mentioned scheme, when the removal was pour the car, upwards spur fixed slider, the joint piece can go out the joint groove under the effect of spring to with fixed slider stable in the position of leaving fixed inserting groove, operating personnel can concentrate on the removal of pouring the car this moment, when needs fixed pouring car, promote fixed slider downwards, the joint piece can be extruded and slide to the joint groove in, the realization of guarantee fixed function.

To sum up, the utility model discloses following beneficial effect has:

1. the accuracy and the stability of pouring can be effectively improved, so that the effect of efficiently pouring the die with a smaller pouring hole is realized;

2. the pouring trolley can be conveniently fixed or moved, and the use efficiency of the pouring trolley is improved;

3. the service life of the pouring equipment can be effectively prolonged.

Drawings

FIG. 1 is an overall schematic view of the present embodiment;

FIG. 2 is a partial sectional view of the embodiment of the protruding barrel structure;

FIG. 3 is a partial schematic view of a projected rail wheel configuration of an embodiment;

fig. 4 is a partial sectional view showing the structure of the protrusion fixing mechanism in the embodiment.

In the figure, 1, a vehicle body bracket; 11. dumping the hopper; 12. a transmission mechanism; 121. a transmission cylinder; 13. a blocking beam; 131. a protective layer; 14. a rail wheel; 141. a driven gear; 142. a driving gear; 143. a chain; 144. a hand-operated wheel; 2. a track; 21. fixing the slot; 22. a mold slot; 3. a containing barrel; 31. a containing groove; 32. pouring a spout; 321. dumping the trough body; 33. a rotating shaft; 34. a clamping block; 35. a through hole; 4. a fixing mechanism; 41. fixing the sliding block; 411. a handle; 412. a clamping groove; 413. a clamping block; 414. a spring; 42. a slider slot.

Detailed Description

Example (b): a track casting vehicle for a vertical molding line comprises a track 2, wherein a vehicle body support 1 is connected to the track 2 in a sliding mode, the vehicle body support 1 can slide along the length direction of the track 2, and a containing barrel 3 used for containing and pouring molten iron is connected to the top of the vehicle body support 1 in a rotating mode. During the use, slide automobile body support 1 to the position top of mould along track 2, rotatory splendid attire bucket 3, alright pour the mould that needs pour with the molten iron in the splendid attire bucket 3.

As shown in fig. 1 and 2, the containing barrel 3 is arranged perpendicular to the length direction of the rail 2, a containing groove 31 is formed in the side surface of the containing barrel 3, a pouring opening 32 is formed in the position of the containing barrel 3 corresponding to one side of the containing groove 31, and the pouring opening 32 is communicated with the containing groove 31. A pouring trough body 321 is fixedly connected to the position of the filling barrel 3 close to the pouring opening 32 and far away from the filling trough 31. When the loading bucket 3 is rotated, the molten iron in the loading bucket 3 can flow from the pouring port 32 into the pouring trough body 321. The position of the vehicle body bracket 1 corresponding to one side of the containing barrel 3 is fixedly connected with a dumping hopper 11. When splendid attire bucket 3 rotated to when splendid attire bucket 31 was located 3 top positions of splendid attire bucket, pouring opening 32 was located one side that splendid attire bucket 31 was close to emptys hopper 11, when splendid attire bucket 3 rotated to the one end that emptys cell body 321 and kept away from splendid attire bucket 3 was located the position department above emptying hopper 11, liquid in splendid attire bucket 3 can follow pouring opening 32 and flow into along emptying cell body 321 and emptys hopper 11. The position of the vehicle body bracket 1 corresponding to the end part of the containing barrel 3 is connected with a transmission mechanism 12 which can drive the containing barrel 3 to rotate. The transmission mechanism 12 comprises a transmission cylinder 121 rotatably connected to the bottom of the vehicle body support 1, and the transmission cylinder 121 can rotate in the longitudinal section. The edge of the end face of the containing barrel 3 close to the transmission cylinder 121 is fixedly connected with a rotating shaft 33, and a piston rod of the transmission cylinder 121 is rotatably connected to the rotating shaft 33. When the molten iron is poured, the transmission cylinder 121 is started, the containing barrel 3 is inclined, at the moment, the molten iron can flow to the pouring hopper 11 along the pouring groove body 321 from the pouring opening 32, finally falls to a pouring hole of the mold along a lower port of the pouring hopper 11, and the pouring process is completed.

As shown in fig. 2, a stop beam 13 is fixedly connected to a position of the bottom of the car body frame 1 corresponding to the lower side of the containing barrel 3 and arranged along the length direction of the containing barrel 3, a latch 34 is fixedly connected to a position of the outer side of the containing barrel 3 far away from the containing groove 31, and when the pouring trough body 321 is located above the pouring hopper 11, the latch 34 can abut against the stop beam 13. A protective layer 131 made of an elastic material such as graphene is fixedly connected to one side surface of the blocking beam 13 close to the latch 34. The fixture block 34 can abut against the blocking beam 13 when the containing barrel 3 rotates to a proper position, so that the position of the containing barrel 3 is stabilized, the phenomenon of raw material waste or raw material splashing caused by the fact that the pouring speed is too fast due to excessive rotation of the containing barrel 3 is prevented, and the pouring efficiency is guaranteed. In the process of the multiple collision of the latch 34 with the blocking beam 13, the protective layer 131 can disperse the force of the latch 34 against the blocking beam 13, so that the damage to the blocking beam 13 is reduced, thereby extending the service life of the blocking beam 13.

As shown in fig. 2, a plurality of through holes 35 are formed in the sidewall of the containing barrel 3 near the containing groove 31. When adding the molten iron into splendid attire bucket 3, need ensure that the atmospheric pressure in the splendid attire bucket 3 is stable in order to realize that the efficient molten iron adds, through-hole 35 can effectively play the effect of balanced atmospheric pressure to the high efficiency of guarantee molten iron interpolation goes on.

As shown in fig. 2 and 3, a plurality of rail wheels 14 are rotatably connected to the bottom of the vehicle body support 1 at positions corresponding to the rails 2, and the rail wheels 14 are slidably connected to the rails 2. The vehicle body frame 1 is provided with a fixing mechanism 4 at a position close to the rail wheel 14. The fixing mechanism 4 includes a fixing slider 41 slidably attached to the bottom of the vehicle body frame 1 at a position corresponding to the upper side of the rail 2, and the fixing slider 41 is slidable in the vertical direction. The bottom of the car body support 1 is provided with a vertically arranged slide block slot 42 (see fig. 4) corresponding to the position above the track 2, and the fixed slide block 41 is slidably connected in the slide block slot 42. A plurality of vertically arranged fixing slots 21 are formed in the top of the rail 2 at positions corresponding to the lower portions of the fixing sliders 41, and all the fixing slots 21 are arranged along the length direction of the rail 2. The fixed slider 41 can be inserted into the fixed slot 21 when sliding downward. The top of the fixed slider 41 is fixedly connected with a handle 411. When the pouring vehicle moves to the position above the corresponding pouring hole, the pouring vehicle needs to be stopped stably to ensure the accuracy and stability of pouring, and when the pouring vehicle needs to be stopped stably, the fixed sliding block 41 is downwards inserted into the fixed inserting groove 21, so that the effect of fixing the pouring vehicle at a certain position of the track 2 can be realized, and the effect of stably fixing the pouring vehicle is realized. The handle 411 is arranged, so that the convenience degree of an operator when the operator stops or moves to pour the vehicle can be improved, and the use efficiency is improved.

As shown in fig. 2 and 3, a driven gear 141 is fixedly connected to a side of one rail wheel 14 away from the vehicle body frame 1, a driving gear 142 is rotatably connected to a side of the vehicle body frame 1 close to the driven gear 141, and a chain 143 is engaged with outer sides of the driving gear 142 and the driven gear 141. One side of the driving gear 142 far away from the vehicle body bracket 1 is fixedly connected with a hand-operated wheel 144 which is coaxially arranged with the driving gear 142. When the vehicle body support 1 needs to be moved, the hand wheel 144 is rotated, so that the rail wheel 14 can be rotated under the transmission of the driving gear 142 and the driven gear 141, and the vehicle body support 1 is moved.

As shown in fig. 2 and 4, a vertically arranged clamping groove 412 is formed in the top of the fixed slider 41, a clamping block 413 is rotatably connected to a position, close to the bottom of the clamping groove 412, of the fixed slider 41, the clamping block 413 can rotate in a longitudinal section, and the clamping block 413 can be accommodated in the clamping groove 412. The clamping block 413 is fixedly connected with a spring 414 near the top of the side wall of the clamping groove 412, one end of the spring 414 far away from the clamping block 413 is fixedly connected to the position, close to the clamping groove 412, of the fixed slide block 41, and the spring 414 can apply force to the clamping block 413 to move in the direction far away from the clamping groove 412. When the car is pour in the removal, upwards stimulate fixed slider 41, joint piece 413 can go out joint groove 412 under the effect of spring 414 to stabilize fixed slider 41 in the position of leaving fixed slot 21, operating personnel can concentrate on the removal of pouring the car this moment, when needs fixed pouring car, pushes down fixed slider 41, joint piece 413 can be extruded and slide to joint groove 412 in, the realization of guarantee fixed function.

Referring back to fig. 2, a plurality of mold slots 22 perpendicular to the length direction of the rail 2 are formed at the top of the rail 2 corresponding to the lower portion of the pouring hopper 11, and all the mold slots 22 are arranged along the length direction of the rail 2. Place the mould in mould groove 22, realization mould position that on the one hand can be better and the mutual correspondence of the position that the car can stall steadily pour, on the other hand also can further promote the stability of mould, prevent that the mould from being touch the removal and leading to pouring the effect not good pouring the car removal in-process.

The use method comprises the following steps: when using, pour ladle 3 into the molten iron, with ladle 3 along with automobile body support 1 remove the mould top that needs were pour, fix through fixed establishment 4, through rotatory ladle 3 of transmission cylinder 121, when rotatory suitable position with ladle 3, the molten iron can flow to dumping hopper 11 from dumping cell body 321 to flow to the mould from the lower port of dumping hopper 11, accomplish and pour the process.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a perpendicular mo (u) lding line is with track car of pouring, includes vehicle body support (1), vehicle body support (1) bottom is provided with track (2), vehicle body support (1) bottom corresponds the position department of track (2) rotates and is connected with a plurality of rail wheels (14), rail wheel (14) all sliding connection in on track (2), its characterized in that: the top of the vehicle body support (1) is rotatably connected with a containing barrel (3) which is perpendicular to the length direction of the track (2), a containing groove (31) is formed in the side face of the containing barrel (3), a pouring opening (32) is formed in the position, corresponding to one side of the containing groove (31), of the containing barrel (3), and a transmission mechanism (12) capable of driving the containing barrel (3) to rotate is connected to the position, corresponding to the end part of the containing barrel (3), of the vehicle body support (1);

a pouring trough body (321) is fixedly connected to the position, close to the pouring opening (32) and far away from one side of the containing trough (31), of the containing bucket (3), and when the containing bucket (3) rotates, molten iron in the containing bucket (3) can flow into the pouring trough body (321) from the pouring opening (32);

automobile body support (1) corresponds hopper (11) is emptyd to the position department fixedly connected with of splendid attire bucket (3) one side, works as splendid attire bucket (3) rotate extremely it keeps away from to empty cell body (321) the one end of splendid attire bucket (3) is located when empting hopper (11) top position department, liquid in splendid attire bucket (3) can be followed pouring opening (32) are followed it flows into to empty cell body (321) in empting hopper (11).

2. The track laying vehicle for a vertical molding line according to claim 1, wherein: the transmission mechanism (12) comprises a transmission cylinder (121) which is rotatably connected to the bottom of the vehicle body support (1), the transmission cylinder (121) can rotate in the longitudinal section, and a piston rod of the transmission cylinder (121) is fixedly connected to the edge of the end face of the containing barrel (3).

3. The track laying vehicle for a vertical molding line according to claim 1, wherein: and a fixing mechanism (4) capable of fixing the relative position of the vehicle body support (1) and the track (2) is arranged at the position, close to the track wheels (14), of the vehicle body support (1).

4. The track laying vehicle for a vertical molding line according to claim 3, wherein: the fixing mechanism (4) comprises a fixing sliding block (41) which is connected to the bottom of the vehicle body support (1) in a sliding mode and corresponds to the position above the track (2), the fixing sliding block (41) can slide in the vertical direction, a plurality of vertically arranged fixing slots (21) are formed in the position, corresponding to the position below the fixing sliding block (41), of the top of the track (2), all the fixing slots (21) are arranged in the length direction of the track (2), and the fixing sliding block (41) can be inserted into the fixing slots (21) when sliding downwards.

5. The track laying vehicle for a vertical molding line according to claim 4, wherein: the top of the fixed sliding block (41) is fixedly connected with a handle (411).

6. The track laying vehicle for a vertical molding line according to claim 1, wherein: a plurality of mold grooves (22) perpendicular to the length direction of the rail (2) are formed in the position, corresponding to the lower portion of the pouring hopper (11), of the top of the rail (2), and all the mold grooves (22) are arranged along the length direction of the rail (2).

7. The track laying vehicle for a vertical molding line according to claim 1, wherein: automobile body support (1) bottom corresponds position department fixedly connected with of splendid attire bucket (3) below is followed the fender roof beam (13) that splendid attire bucket (3) length direction set up, keep away from in the splendid attire bucket (3) outside position department fixedly connected with fixture block (34) of splendid attire groove (31), work as it is located to empty cell body (321) when empting hopper (11) top, fixture block (34) can the butt in keep off roof beam (13).

8. The track laying vehicle for a vertical molding line according to claim 7, wherein: and an elastic protective layer (131) is fixedly connected to one side surface of the blocking beam (13) close to the clamping block (34).

9. The track laying vehicle for a vertical molding line according to claim 1, wherein: the side wall of the containing barrel (3) close to the containing groove (31) is provided with a plurality of through holes (35) which are arranged in an array.

10. The track laying vehicle for a vertical molding line according to claim 4, wherein: automobile body support (1) bottom corresponds track (2) top position department sets up slider groove (42) of vertical setting, fixed slider (41) sliding connection in slider groove (42), joint groove (412) of vertical setting are seted up at fixed slider (41) top, fixed slider (41) are close to the position department of joint groove (412) bottom rotates and is connected with joint piece (413), joint piece (413) can be at the cross section internal rotation of ordinates, joint piece (413) can be accomodate in joint groove (412), joint piece (413) are close to the lateral wall top fixedly connected with spring (414) of joint groove (412), spring (414) are kept away from the one end fixed connection of joint piece (413) in fixed slider (41) are close to the position department of joint groove (412), spring (414) can give joint piece (413) apply to keeping away from the power that joint groove (412) direction removed.