CN107867637A

CN107867637A - A kind of two running trolleys of band and can random angle rotation crane

Info

Publication number: CN107867637A
Application number: CN201610848616.3A
Authority: CN
Inventors: 卢统华
Original assignee: Fuzhou Gulou Automatic Equipment Co Ltd
Current assignee: Fuzhou Gulou Automatic Equipment Co Ltd
Priority date: 2016-09-26
Filing date: 2016-09-26
Publication date: 2018-04-03

Abstract

This application discloses a kind of two running trolleys of band and can random angle rotation crane, including two end carriages, two girders；The lateral surface of wherein one girder, which is provided with, chooses electric frame and removable lashed cable；Two running trolleys are connected on track above two girders；Girder lateral surface all sets a rail；Running trolley both sides all connect anti-roller devices, and anti-roller devices are ganged up with rail and can run；Running trolley is driven using " three-in-one " reductor；Running trolley center is provided with rotating mechanism；The cantilever member connection of suspension rod axle lower end and triangle in rotating mechanism, upper end connection bus ring；The both ends of two end carriages respectively connect a safety hook；Electric block is connected on cantilever member, electric block can move back and forth along outrigger horizontal；Cantilever beam is in below two girders and can be around suspension rod axis center Arbitrary Rotation in the horizontal plane.

Description

A kind of two running trolleys of band and can random angle rotation crane

Technical field

The application is related to crane field, more particularly to a kind of two running trolleys of band and can random angle rotation lifting Machine.

Background technology

Existing bridge crane is applied in Workshop, and many machine tools have been controlled in some workshops and have been processed life Production, product and raw material are required for Real-Time Transport to next door workshop or other departments；The suspension hook of crane on workshop is from dolly Upper hang carries out lifting goods, and dolly can only be run back and forth along crane twin beams, and crane can only be along workshop both sides Run back and forth across the cart track on post, the goods scope that such crane hook can lift is in two, workshop cart track Within the plane that two-end-point is surrounded, when being in the goods of this horizontal edge needs lifting, suspension hook just produces oblique pull, then from this The article (such as workshop outdoors, across outer) of far point cannot lift outside individual plane, can only now turn by other transporting equipments Fortune, generally drives workshop into by automobile and lifting goods is carried out under suspension hook, some cars are opened to come in this workshop and next door workshop Between laterally lay track, allow trolley special to reach suspension hook and get off to join goods, some is in workshop doorway (or workshop passageway) A special cantilever crane is set up, scheduling is transported through to the goods outside workshop, first goods is lifted up into and hung in this workshop crane The place that hook is got at, then again by crane this goods handling to the other stations in workshop, what is used under this operating mode shows There is bridge crane, can not directly join goods with next door workshop, must be brought quite not by other transporting equipment schedule jobs Just, manpower and materials are also produced to waste.

The content of the invention

The application purpose be to provide a kind of two running trolleys of band and can random angle rotation crane, the crane Can simultaneously by workshop both sides cart support rail beam, this workshop of unloading, can be in car across the goods in outer next door place directly below Between operation simultaneously outside two end bays, also can be in this workshop in cart running track direction direct unloading goods in place outdoors, especially The elongate article being adapted to inside and outside handling workshop, it is not necessary to transported by other transporting equipments；The cantilever beam rotating speed of the crane can It is accurate to reach user's request, and can Arbitrary Rotation in the horizontal plane；The crane do not tumble, run it is smooth do not block, Securely and reliably.

To reach above-mentioned purpose, the application is realized using following technology：

A kind of two running trolleys of band and can random angle rotation crane, including two end carriages, 1, two girder 2 is described The terminations of two girders be connected to respectively by bolt 221 on two end carriages；The lateral surface of wherein one girder is set Choose electric frame 121；It is characterized in that：Two running trolleys 3 are connected on track 21 above two girders；The operation is small The wheel tread of car is ridden on the rail level of the track 21, and can be run；It is described to choose electric frame 121 and movably hung provided with two groups Cable 123；Two girder lateral surfaces all set rail level rail 22 directed downwardly, and with above-mentioned parallel track；Above-mentioned operation The both sides of dolly 3 respectively gang up with the rail 22 and can run by two sets of anti-roller devices 33 of connection, the anti-roller devices；It is described Running trolley is driven using " three-in-one " reductor；The center of running trolley 3 is provided with the rotating mechanism 4 with fan tooth transmission；Institute State the lower end connecting cantilever component 5 of suspension rod axle 42 in rotating mechanism, upper end connection bus ring 9；The both ends of above-mentioned two end carriages 1 Respectively one safety hook 11 of connection；The cantilever member triangular shape, electric block 7, electric block energy edge are connected on cantilever beam Outrigger horizontal to move back and forth；The cantilever beam is in operation outside extended workshop below girder, and can be in suspension rod axle 4 Heart Arbitrary Rotation in the horizontal plane.

Wherein, described rotating mechanism 4 includes drive device 40, little gear 402, gear wheel 403, bearing block 41, suspension rod Axle 42；The suspension rod axle is hollow shaft, and its one end is provided with screw thread, and threaded end opens up locking breach 421；The suspension rod axle passes through Thrust bearing 45 is connected to inside the bearing block 41, the suspension rod axle reconnect bearing A44 and bearing B46, the bearing A and Bearing B is connected to the both ends of above-mentioned bearing block, described suspension rod axle one end by bolt and fixed cover 43 and blind flange 47 respectively Stretched from the center of fixed cover 43, the other end is stretched from the above-mentioned center of blind flange 47；The bearing block 41 is by above-mentioned The bolt connection of blind flange 47 is fixed on trolley frame 31；Described drive device 40 is combined by motor and vertical type speed reducer (change gear), The flanged disk of the vertical type speed reducer (change gear) and output shaft；Described drive device is bolted on reductor bearing 401, institute Reductor bearing is stated to be fixed on trolley frame 31；Described drive device output shaft is connected to little gear 402, the little gear with The external toothing of gear wheel 403 is connected, and the gear wheel is connected on above-mentioned suspension rod axle 42.

Wherein, described running trolley 3 includes trolley frame 31, drive car 32, passive wheel group 35；The dolly Frame 31 is welded into plate structure by steel plate and shaped steel combination；The trolley frame center is provided with assembling window 311 and is used to connect whirler Structure, trolley frame both sides transverse side respectively set two connecting seats 312, and connecting seat is provided with connecting hole 3121 and is used to connect anti-roller Device, trolley frame both sides longitudinal side are designed with buffer 313；The drive car 32 and two sets of passive wheel groups 35 are connected to below trolley frame；Drive car 32 includes " three-in-one " reductor 321, left adhesion wheel group 322, right active Wheel group 323；Described " three-in-one " reductor 321 combines adult by reductor, motor, brake；" three-in-one " reductor Output shaft be hollow shaft；" three-in-one " reductor is connected on trolley frame 31 by bearing 324；" three-in-one " reductor it is defeated Shaft is connected with left adhesion wheel group 322, and the wheel shaft end of the left adhesion wheel group passes through spline box coupling 325 It is connected with right adhesion wheel group 323；Above-mentioned left adhesion wheel group 322 is connected to trolley frame with right adhesion wheel group 323 31 both sides.

Wherein, described cantilever member 5 includes cantilever beam 51, Holder for hanging household utensiles 52, brace 53；Described one setting of Holder for hanging household utensiles Connecting hole 521, keyway 522 is provided with described connecting hole and is used for and suspension rod axis connection；The Holder for hanging household utensiles other end is provided with operation Window 523；The operation window of the Holder for hanging household utensiles 52 this be welded on one end of the cantilever beam 51；The other end of the cantilever beam with Above-mentioned brace 53 is connected between Holder for hanging household utensiles and forms triangular structure；The cantilever beam both ends are provided with buffing pad 511.

Wherein, described cantilever member 5 is connected to the suspension rod axle 42 of rotating mechanism by flat key 49 and stop nut 100 On；Described stop nut and suspension rod axle is connected by bolt and locking plate 110 again.

Wherein, described anti-roller devices 33 include roller 331, axle 332, bearing 333, and described axle 332 is arranged to one Hold the big other end small, the small one end of the axle sets jagged 3321；Two axis holes 3331 are provided with the bearing；The rolling Wheel surface sets in the arc-shaped, its internal setting shaft shoulder 3311；Described roller passes through two bearings 334 and sleeve 335 and axle Connection；The axle is connected by locking plate 336 and bolt with bearing；The bearing 333 passes through adjust pad 337 and trolley frame 31 Connection.

Wherein, the eave tile of described safety hook 11 is connected with the lower surface gap of the upper cover plate Ji edge of cart support rail beam 12.

Wherein, described bus ring 9 can purchase electromechanical accessory, and it includes interior insulation circle, outer insulator, and interior insulation circle can Around outer insulator rotate and can mutually conduction；Interior insulation circle is connected on the suspension rod axle 42 in rotating mechanism, on interior insulation circle The cable of conducting ring is connected to electric block by hollow inside suspension rod axle 42；Outer insulator is fixed on trolley frame by support On, the cable on outer insulator is connected with external power cord.

The beneficial effect of the application is：

In the application crane configure two running trolleys (3), it is necessary to when running trolley can reach workshop two respectively Side operation simultaneously, improves efficiency；Cantilever beam in running trolley can be stretched out between crane locomotive to outdoors or straight to next door workshop Connect lifting goods；Two running trolleys are not only able to be in crane both ends unloading cart running track line side workshop respectively Goods, parted hair operation；And it is capable of the next door workshop goods of unloading cart traffic direction end points；Two cantilever beam can stretch out simultaneously Operation outside workshop, especially facilitate cooperation to hang elongated, the soft object of lift, rotated by two the different of cantilever beam, object handling To suitable position；Because cantilever beam is arranged at the lower section of running trolley and girder, cantilever beam can by be stretched into below support rail beam every The direct lifting cargo in wall workshop, or can directly stretch out the workshop operation outdoors of cart traffic direction；After lifting goods, by electronic Motion of the cucurbit along cantilever beam, or the rotation by cantilever member, or the movement by running trolley, or it is big by crane The motion of car, or by foregoing four integrated motion, the goods of lifting can be hung onto the place that this workshop needs；With every Wall workshop or workshop can need not borrow the transhipment of other transporting equipments when carrying out goods handing-over outdoors, improve efficiency.

Cantilever beam is equipped with two running trolleys (3) in the application crane, electric block (7) suspension hook therein is matched somebody with somebody Handling elongate article can be facilitated by closing use, and two cantilever beam common operationals are especially suitable for the elongate article inside and outside handling workshop.

Electric frame (121) of choosing on the application loading bridge is provided with two groups of moveable lashed cables (123), respectively to two fortune Row dolly (3) is powered.

The electric block cable (6) of the application crane is from the suspension rod axis center in rotating mechanism by that will not be pulled It is disconnected, it is not required to set rotary limit device, by bus ring connecting cable, ensures that cantilever beam any angle can revolve in the horizontal plane Turn；There are a pair of exposed gear auxiliary driving in rotating mechanism, set by the different numbers of teeth of gear wheel, little gear, user can be met To the precise requirements of the cantilever beam rotary speed of crane, avoid the general speed ratio of direct selection standard reductor and caused hang Arm beam rotating speed and the larger error of actual demand.

Running trolley (3) in the application can move back and forth in the top of girder along girder both ends, be suitable for greatly across Workshop is spent to use；Two anti-roller devices are respectively installed in running trolley both sides, can serve " safety hook ", in anti-roller devices Roller, which is pressed on rail, to be run, and can both have been avoided cantilever beam from overloading and produced running trolley rollover and ensure that security, and and can is protected Card running trolley on wheel all rail do not upwarp, it is ensured that running trolley is run always；It is suitable by adjusting adjust pad (337) Work as thickness, the roller in anti-roller devices is rightly connected with rail (22), rolling can be press against, ensure dolly Run smooth.

Two adhesion wheel groups in the application running trolley drive device are connected by spline box coupling (325) Get up, spline housing is simple in construction, and the small handling ease of size, especially spline housing shaft coupling external diameter are small, and centre-to-centre spacing so can be selected Small " three-in-one " reductor, shaft coupling appearance and size are not interfered with reductor, and cost is low；" three-in-one " reductor, small volume In light weight, noise is small, it is easy for installation the advantages that.

Power supply needed for running trolley and electric block and rotating mechanism in the application crane passes through conduction rack (122) Tow lashed cable (123) one end along choose electric frame upper rail can be as running trolley runs power supply back and forth；The application rotating mechanism In bearing block and suspension rod axis connection lifting power is born by thrust bearing, suspension rod axle by bearing A and above and below bearing B it is spacing live radially Position, ensure that suspension rod axle can bear very big axial force and not offset radially, so as to ensure that drive device axiality is good, rotation is outstanding Arm member is laborsaving；Brace (53) and cantilever beam and Holder for hanging household utensiles composition triangular structure in cantilever member, make cantilever member firm Degree is strong, stability is good, load-carrying is big, the advantages that being lacked with material；Cantilever beam, which is provided at both ends with buffing pad, can avoid electric block along outstanding Arm beam moves back and forth impact or overtravel；After stop nut in cantilever member connection connects with suspension rod axle thread, then there is stop Piece (110) is connected to stop nut with suspension rod axle spindle-end looseness-proof breach, avoiding stop nut from unclamping, and securely and reliably, again might as well Cable is hindered to pass through from suspension rod axis center.

Brief description of the drawings

Fig. 1 is the application structural front view；

Fig. 2 is Fig. 1 side view；

Fig. 3 is Fig. 1 top view；

Fig. 4 is F partial enlarged drawings (rotating mechanism schematic diagram) in Fig. 1；

Fig. 5 is E direction views in Fig. 4；

Fig. 6 is running trolley front view in the application；

Fig. 7 is Fig. 6 top view；

Fig. 8 is cantilever member schematic diagram in the application；

Fig. 9 is anti-roller devices structural representation in the application.

Embodiment

In conjunction with accompanying drawing, the application embodiment is described in detail：

As shown in Figure 1, Figure 2, Figure 3 shows, a kind of two running trolleys of band and can random angle rotation crane, including two end 1, two girder 2 of beam, the termination of described two girders are connected on two end carriages by bolt 221 respectively；Wherein one The lateral surface of bar girder, which is provided with, chooses electric frame 121；Two running trolleys 3 are connected on track 21 above two girders；Institute The wheel tread for stating running trolley is ridden on the rail level of the track 21, and can be run；It is described choose electric frame 121 can provided with two groups Mobile lashed cable 123；Two girder lateral surfaces all set rail level rail 22 directed downwardly, and with above-mentioned parallel track； The above-mentioned both sides of running trolley 3 respectively connect two sets of anti-roller devices 33, and the anti-roller devices are ganged up with the rail 22 and energy Operation；The running trolley is driven using " three-in-one " reductor；The center of running trolley 3 is provided with the rotation with fan tooth transmission Mechanism 4；The lower end connecting cantilever component 5 of suspension rod axle 42 in the rotating mechanism, upper end connection bus ring 9；Above-mentioned two ends The both ends of beam 1 respectively connect a safety hook 11；The cantilever member triangular shape, electric block 7 is connected on cantilever beam, it is electronic Cucurbit can move back and forth along outrigger horizontal；The cantilever beam is in operation outside extended workshop below girder, and can be around The center of suspension rod axle 4 Arbitrary Rotation in the horizontal plane.

The eave tile of described safety hook 11 is connected with the lower surface gap of the upper cover plate Ji edge of cart support rail beam 12.

Described bus ring 9 can purchase electromechanical accessory, and it includes interior insulation circle, outer insulator, and interior insulation circle can be around Outer insulator rotates and can be mutually conductive；Interior insulation circle is connected on the suspension rod axle 42 in rotating mechanism, conductive on interior insulation circle The cable of ring is connected to electric block by hollow inside suspension rod axle 42；Outer insulator is fixed on trolley frame by support, Cable on outer insulator is connected with external power cord.

As shown in Figure 4, Figure 5, described rotating mechanism 4 includes drive device 40, little gear 402, gear wheel 403, bearing Seat 41, suspension rod axle 42；The suspension rod axle is hollow shaft, and its one end is provided with screw thread, and threaded end opens up locking breach 421；It is described Suspension rod axle is connected to inside the bearing block 41 by thrust bearing 45, and the suspension rod axle reconnects bearing A44 and bearing B46, The bearing A and bearing B are connected to the both ends of above-mentioned bearing block by bolt and fixed cover 43 and blind flange 47 respectively, described Suspension rod axle one end is stretched from the center of fixed cover 43, and the other end is stretched from the above-mentioned center of blind flange 47；The bearing block 41 are fixed on trolley frame 31 by the above-mentioned bolt connection of blind flange 47；Described drive device 40 is by motor and vertical type speed reducer (change gear) Combine, the flanged disk of the vertical type speed reducer (change gear) and output shaft；Described drive device is bolted in reductor branch On seat 401, the reductor bearing is fixed on trolley frame 31；Described drive device output shaft is connected to little gear 402, institute State little gear to be connected with the external toothing of gear wheel 403, the gear wheel is connected on above-mentioned suspension rod axle 42.

Described cantilever member 5 is connected on the suspension rod axle 42 of rotating mechanism by flat key 49 and stop nut 100；It is described Stop nut and suspension rod axle connected again by bolt and locking plate 110.

As shown in Figure 6, Figure 7, described running trolley 3 includes trolley frame 31, drive car 32, passive wheel group 35；The trolley frame 31 is welded into plate structure by steel plate and shaped steel combination；The trolley frame center is provided with assembling window 311 and is used for Connection traversing mechanism, trolley frame both sides transverse side respectively set two connecting seats 312, and connecting seat is used for provided with connecting hole 3121 Anti- roller devices are connected, trolley frame both sides longitudinal side is designed with buffer 313；Described in the drive car 32 and two sets Passive wheel group 35 is connected to below trolley frame；Drive car 32 includes " three-in-one " reductor 321, left adhesion wheel group 322nd, right adhesion wheel group 323；Described " three-in-one " reductor 321 combines adult by reductor, motor, brake；" three close The output shaft of one " reductor is hollow shaft；" three-in-one " reductor is connected on trolley frame 31 by bearing 324；" three-in-one " The output shaft of reductor is connected with left adhesion wheel group 322, and the wheel shaft end of the left adhesion wheel group passes through spline set Cylinder shaft coupling 325 is connected with right adhesion wheel group 323；Above-mentioned left adhesion wheel group 322 connects respectively with right adhesion wheel group 323 It is connected on the both sides of trolley frame 31.

As shown in figure 8, described cantilever member 5 includes cantilever beam 51, Holder for hanging household utensiles 52, brace 53；The Holder for hanging household utensiles one Head sets connecting hole 521, and being provided with keyway 522 in described connecting hole is used for and suspension rod axis connection；The Holder for hanging household utensiles other end is set There is operation window 523；The operation window of the Holder for hanging household utensiles 52 this be welded on one end of the cantilever beam 51；The cantilever beam it is another Above-mentioned brace 53 is connected between one end and Holder for hanging household utensiles and forms triangular structure；The cantilever beam both ends are provided with buffing pad 511.

As shown in figure 9, described anti-roller devices 33 include roller 331, axle 332, bearing 333, described axle 332 is set Small into the big other end in one end, the small one end of the axle sets jagged 3321；Two axis holes 3331 are provided with the bearing；Institute State roller surface and in the arc-shaped, its internal setting shaft shoulder 3311 is set；Described roller passes through two bearings 334 and sleeve 335 With axis connection；The axle is connected by locking plate 336 and bolt with bearing；The bearing 333 passes through adjust pad 337 and dolly Frame 31 connects.

Claims

1. a kind of two running trolleys of band and can random angle rotation crane, including two end carriages (1), two girders (2), institute The termination for two girders stated is connected on two end carriages by bolt (221) respectively；The lateral surface of wherein one girder It is provided with and chooses electric frame (121)；It is characterized in that：Two running trolleys (3) are connected on track (21) above two girders； The wheel tread of the running trolley is ridden on the rail level of the track (21), and can be run；The electric frame (121) of choosing is provided with Two groups of moveable lashed cables (123)；Two girder lateral surfaces all set a rail level rail directed downwardly (22), and with it is above-mentioned Parallel track；Above-mentioned running trolley (3) both sides respectively connect two sets of anti-roller devices (33), and the anti-roller devices are ganged up with described On rail (22) and it can run；The running trolley is driven using " three-in-one " reductor；Running trolley (3) center is provided with Rotating mechanism (4)；Suspension rod axle (42) lower end connecting cantilever component (5) in the rotating mechanism, upper end connection bus ring (9)；The both ends of above-mentioned two end carriages (1) respectively connect a safety hook (11)；The cantilever member triangular shape, on cantilever beam Electric block (7) is connected, electric block can move back and forth along outrigger horizontal；The cantilever beam is in extended below girder Operation outside workshop, and can be around suspension rod axle (4) center Arbitrary Rotation in the horizontal plane.

2. two running trolleys of a kind of band according to claim 1 and can random angle rotation crane, it is characterised in that： Described rotating mechanism (4) includes drive device (40), little gear (402), gear wheel (403), bearing block (41), suspension rod axle (42)；The suspension rod axle is hollow shaft, and its one end is provided with screw thread, and threaded end opens up locking breach (421)；The suspension rod axle leads to To cross thrust bearing (45) and be connected to the bearing block (41) inside, the suspension rod axle reconnects bearing A (44) and bearing B (46), The bearing A and bearing B are connected to the both ends of above-mentioned bearing block, institute by bolt and fixed cover (43) and blind flange (47) respectively The suspension rod axle one end stated is stretched from the fixed cover (43) center, and the other end is stretched from above-mentioned blind flange (47) center；Institute Bearing block (41) is stated to be fixed on trolley frame (31) by above-mentioned blind flange (47) bolt connection；Described drive device (40) by Motor combines with vertical type speed reducer (change gear), the flanged disk of the vertical type speed reducer (change gear) and output shaft；Described drive device passes through spiral shell Tether and be connected on reductor bearing (401), the reductor bearing is fixed on trolley frame (31)；Described drive device output Axis connection little gear (402), and the little gear is connected with gear wheel (403) external toothing, and the gear wheel is connected to above-mentioned hang On bar axle (42).

3. two running trolleys of a kind of band according to claim 1 and can random angle rotation crane, it is characterised in that： Described running trolley (3) includes trolley frame (31), drive car (32), passive wheel group (35)；The trolley frame (31) plate structure is welded into by steel plate and shaped steel combination；The trolley frame center is provided with assembling window (311), and trolley frame two is right Answer and two connecting seats (312) and two buffers (313) are respectively set on side；The drive car (32) and two sets of quilts Motor car wheel group (35) is connected to below trolley frame；Drive car (32) includes " three-in-one " reductor (321), left active car Wheel group (322), right adhesion wheel group (323)；Described " three-in-one " reductor (321) is combined by reductor, motor, brake Adult；The output shaft of " three-in-one " reductor is hollow shaft；" three-in-one " reductor is connected to trolley frame by bearing (324) (31) on；The output shaft of " three-in-one " reductor is connected with left adhesion wheel group (322), the axletree of the left adhesion wheel group End is connected by spline box coupling (325) with right adhesion wheel group (323)；Above-mentioned left adhesion wheel group (322) The both sides of trolley frame (31) are connected to right adhesion wheel group (323).

4. two running trolleys of a kind of band according to claim 1 and can random angle rotation crane, it is characterised in that： Described cantilever member (5) includes cantilever beam (51), Holder for hanging household utensiles (52), brace (53)；The Holder for hanging household utensiles one sets connection Hole (521), described connecting hole is interior to be provided with keyway (522)；The Holder for hanging household utensiles other end is provided with operation window (523)；The hanging This head of the operation window of seat (52) is welded on one end of the cantilever beam (51)；Between the other end and Holder for hanging household utensiles of the cantilever beam Connect above-mentioned brace (53) and form triangular structure；The cantilever beam both ends are provided with buffing pad (511).

5. two running trolleys of a kind of band according to claim 1 and can random angle rotation crane, it is characterised in that： Described cantilever member (5) is connected on the suspension rod axle (42) of rotating mechanism by flat key (49) and stop nut (100)；It is described Stop nut and suspension rod axle connected again by bolt and locking plate (110).

6. two running trolleys of a kind of band according to claim 1 and can random angle rotation crane, it is characterised in that： Described anti-roller devices (33) include roller (331), axle (332), bearing (333), and it is big that described axle (332) is arranged to one end The other end is small, and the small one end of the axle sets jagged (3321)；Two axis holes (3331) are provided with the bearing；The rolling Wheel surface sets in the arc-shaped, its internal setting shaft shoulder (3311)；Described roller passes through two bearings (334) and sleeve And axis connection (335)；The axle is connected by locking plate (336) and bolt with bearing；The bearing (333) passes through adjust pad (337) it is connected with the connecting seat (311) on trolley frame.

7. two running trolleys of a kind of band according to claim 1 and can random angle rotation crane, it is characterised in that： The eave tile of described safety hook (11) is connected with the lower surface gap of cart support rail beam (12) upper cover plate Ji edge.