CN2774853Y - Covering net device for self-dumping track - Google Patents

Abstract

The utility model discloses a covering net device for a truck hopper of a self-dumping truck. The utility model comprises a drive part which is connected with power source, a dragline part, a slide seat with a plurality of pulleys, a net pulling frame, a control supporting device and a guide mechanism, wherein the drive part is in a motive power connection with the dragline part to drive a dragline of the dragline part, the dragline is connected with the slide seat, and the slide seat slides horizontally along a settled position of the truck hopper via the pulleys; in addition, the top part of the slide seat is pivoted with one end of the net pulling frame which is used for connecting a covering net and for the touch of the control supporting device which is pivoted with the net pulling frame, and the guide mechanism comprises a first, a second and a third guide pieces. When the covering net unfolds, the slide seat moves and causes the third guide piece to touch the controlling support device, a pouring state forms, and a fixed point of the net unfolding of the net pulling frame is positioned; when the covering net folds, the second guide piece lifts the first guide piece to support the control supporting device, the control supporting device restores into an original place, automatic net unfolding and folding are provided, wind resistance influence on the covering net device is reduced, and the covering net device moves at a high speed, fluently and actually.

Description

Be suitable for the nerve of a covering device of dumping car wagon box

Technical field

The utility model relates to a kind of such as dumping cars such as gravel cars, and in order to cover the nerve of a covering of material, that particularly controls nerve of a covering throws the net, receives the net operation, not only all can be automatic, and action is smooth and easy fast.

Background technology

Dumping car (Dump Truck) is the large-scale truck form of putting material, has such as the gravel car form promptly to be with the function of wagon box wing drop so that material is unloaded.Vehicle-mounted material, the especially sandstone gone up of general self-unloading dispels the material swarming for exempting from wind-force, influences the traffic traffic safety, therefore can nerve of a covering be installed at wagon box one end, allows nerve of a covering spread the cover material, and makes the nerve of a covering other end be positioned at the wagon box end.

The form of aforementioned nerve of a covering as shown in figure 15, wagon box 90 sets up a driver 91 that comprises motor, chain gearing by headstock one end, use interlock one cylinder 92, volume is established nerve of a covering 93 on the cylinder 92,90 liang of outsides of wagon box approximate bridge 94 that is "＜" shape that respectively is pivoted, terminal common free ends that link nerves of a covering 93 of two bridges 94, and be connected a Return spring 95 between wagon box 90 and bridge 94, wagon box 90 are provided with the static line 96 that can hold bridge 94.And wagon box 90 is controlled 93 of nerves of a covering, occurred several problems when receiving net with above-mentioned technology, and is following listed:

When 1, no doubt receiving net, can be by the motor power of driver, the priming bridge moves towards the cylinder pivot, and elongates Return spring to furl nerve of a covering, re-uses static line and fixes; But, lay the action of throwing the net of nerve of a covering, but need be by " manpower " pulling nerve of a covering free end, the elastic-restoring force that cooperates Return spring, make nerve of a covering terminal by establishing to place, the terminal location of wagon box, therefore the action of throwing the net of nerve of a covering needs to use manpower, and shortcoming is convenience, the time-saving function of operation fully automatically.

2, because to receive the net action be to elongate this Return spring, so repeated use, elastic fatigue even distortion will appear in Return spring, if static line fracture in the driving, bridge can be suddenly upwards lifting even bump foreign matter and cause distortion, damage.

3, be by ship port, coastal high wind zone as the dumping car position, no matter the bridge of frivolous form is to receive net, throwing the net and move midway, all be to hold high and can facing the wind, cause windage to cause deformed damaged, and nerve of a covering is blown askew by high wind, depart from the track of receiving net, throwing the net, the difficulty of controlling and receive net, throw the net all.

The utility model content

The utility model person develops a kind of nerve of a covering device in view of foregoing problems, its main creation purpose ties up to provides a kind of nerve of a covering of suitable dumping car wagon box device, mechanism by multiple boot, slide rail limits nerve of a covering, be not subjected to windage effect and slide smooth and easyly, more provide and receive net, the action of throwing the net all is that purpose is finished in the automation of exempting from manpower fast.

Technical solution of the present utility model is: a kind of nerve of a covering device of suitable dumping car wagon box comprises: one can be arranged at wagon box and the driving section of power can be provided; One links driving section power and drag-line portion that straight line moves, and it comprises a drag-line that is driven; One links the slide of drag-line portion, and it comprises a plurality of pulleys that can slide along wagon box one side, and this slide links drag-line and is provided with slidably to be subjected to its power, and this slide has one at least and is positioned at the top flat at top and the control mouth of adjacent this top flat; One control support device, the side lever that it has a king-rod and is connected in king-rod both sides hypomere; One in order to link the frame that draws in the net of nerve of a covering, and it comprises the two layback bodies and that are long-armed shape can be for the outer tube of nerve of a covering joint, and wherein, this layback body one end is articulated in slide, link this outer tube between this two laybacks body, and this layback body articulates this king-rod; One guide mechanism, it comprises one first guiding piece, one second guiding piece, one the 3rd guiding piece, wherein, this first guiding piece is arranged at this layback body inboard, this second guiding piece that can be arranged on the wagon box has skewed slide bar, this slide bar height is gradually high shape towards this propulsion source direction, and contacting with this first guiding piece, and the 3rd guiding piece is arranged at wagon box with the corresponding side lever that touches this control support device.

The nerve of a covering device of aforesaid suitable dumping car wagon box, described propulsion source is arranged at wagon box near headstock one end, propulsion source links the motor of reductor, propulsion source outputting power place links transmission one transmission bar, with be linked to one this fasten the driven shaft of flower wheel, described driven shaft pivot is through at a bearing seat, and this bearing seat is fixed in a top of the trellis of wagon box one side, and volume is established nerve of a covering on the driven shaft.

The nerve of a covering device of aforesaid suitable dumping car wagon box, described drag-line portion comprise a first round, one second take turns, a drag-line, this first round fastens the driven shaft in the driving section, and this second is taken turns and be hubbed at the free end of wagon box away from headstock, and described first and second taken turns this drag-line of winding.

The nerve of a covering device of aforesaid suitable dumping car wagon box, described drag-line portion comprises a tension force group, it comprises a straining pulley that is hubbed at wheel seat, this straining pulley is by touching in the drag-line downside, this tension force group comprises the pedestal of a tool spring, one driving screw, a plurality of sub-screws, one slide track seat, one enclosing cover, wherein, the slide track seat that this section is H shape is arranged at the wagon box outside, and horizontal the stretching of slide track seat downside is provided with horizontal base plate, and enclosing cover is a ㄇ shape, the corresponding slide track seat of its opening, the wheel seat of straining pulley can be provided with slidably in interior, and this base bottom surface that is ㄇ shape connects this driving screw, and described driving screw installs base plate, and sub-screw installs base plate, shores the pedestal bottom side in order to sub-screw.

The nerve of a covering device of aforesaid suitable dumping car wagon box, the lamellar body form that described slide section is nearly ㄇ shape, both sides are made as first lateral plate respectively, second lateral plate, connect first, two lateral plates are top flats, first, forming the control mouth near the propulsion source position between two lateral plates, slide is first, two lateral plates are respectively at preceding, position, two opposite ends, back, articulate one first pulley respectively, one second pulley, first lateral plate is triangular in shape, lower end end one the 3rd pulley that independently is pivoted, and wagon box can be in last, downside is fixed slide rail on respectively, one glidepath, described first, slide rail is gone up in the contact of two pulleys, the 3rd pulley contact glidepath, this drag-line one end is fixed on first lateral plate, and the free end that other end winding second is taken turns also is fixed in first lateral plate.

The nerve of a covering device of aforesaid suitable dumping car wagon box, the side lever of described control support device is terminal, and the 3rd guiding piece is a V shape pole in order to be the contravention that pushes away of excurvation shape, its two free end pushes away the contravention contact towards looking closely direction horizontal-extending one push rod section with correspondence.

The nerve of a covering device of aforesaid suitable dumping car wagon box, described layback body one end that draws in the net frame is articulated between first and second lateral plate of slide, the other end be " shape; the layback body at the horizontal place of stretching of level for shrinking section; install this outer tube in two shrinking sections; is connected an elastic component between described layback end of body and outer tube, this is the joint seat of ㄇ shape to this layback body near epimere place captive joint, and the both sides of joint seat articulate the king-rod top that device is supportted in control.

The nerve of a covering device of aforesaid suitable dumping car wagon box, described first guiding piece is＞shape, prominently draws end extending one section towards the corner of downside, and this second guiding piece is triangular shape and distributes, be connected a plurality of poles between slide bar and wagon box, slide bar at this highest section for being straight support section.

The nerve of a covering device of aforesaid suitable dumping car wagon box, the corresponding nerve of a covering in the described wagon box outside position of throwing the net is provided with the cut-off switch of throwing the net, and corresponding nerve of a covering is received the net position and is provided with one and receives the net cut-off switch.

The nerve of a covering device of aforesaid suitable dumping car wagon box, described slide is provided with height adjustable the 4th pulley, the 4th pulley comprises a nut seat, a pulley screw rod, an auxiliary block, an assist spring, wherein be installed in the slide outside this nut seat longitudinally-moving, the pulley screw flight is engaged in the nut seat, pulley screw rod external part is in conjunction with a locking cap, to be fixed in this L-shaped auxiliary block, auxiliary block is level and settles the 4th pulley to the position, the 4th pulley is hubbed at auxiliary block, and auxiliary block and slide link this assist spring two ends respectively.

Therefore, the utility model effect that can obtain is following listed:

1, can receive net automatically, throw the net, exempt the trouble and inconvenience of manually throwing the net.

2, throw the net, receive the net motion flow, control slide linear slide positively by drag-line portion fully, change the technical matters that was subjected to windage effect in the past even destroyed utensil fully.

Especially what deserves to be mentioned is that 3, the guide of arranging in pairs or groups makes the self-orientation when arriving fixed point of throwing the net, when receiving net, can automatic lifting reply incipient state via guide again, break through technological means in the past fully.

4, in receiving network process, make nerve of a covering be low volt attitude via guide and move, so moving process halfway can significantly reduce high wind and blow and damage the nerve of a covering associated mechanisms, operate the facility of feeling at ease, service life is long more than known configurations.

Description of drawings

Fig. 1 is the side plan view that the utility model is assembled in wagon box.

Fig. 2 is a partly stereo appearance figure of the utility model.

Fig. 3 is the utility model tension force group and driving section three-dimensional element exploded drawings.

Fig. 4 is the utility model guide and the slide configuration block diagram at the wagon box end.

Fig. 5 is the utility model slide three-dimensional element exploded drawings.

Fig. 6 be the utility model guide, wagon box configuration relation look closely section-drawing.

Fig. 7 is that the utility model shows that slide begins the schematic side view of throwing the net and moving.

Fig. 8 is that the utility model shows the schematic side view that slide is thrown the net and moved midway.

Fig. 9 is the schematic side view that the utility model demonstration slide is finished the action of throwing the net.

Figure 10 is the schematic side view that the utility model shows the action of slide receipts net.

Figure 11 is that the utility model shows and to draw in the net the partial plan layout that frame and layback body dispose.

Figure 12 is that the utility model increases the side plan view of receiving the net cut-off switch.

Figure 13 is that the utility model shows that slide is provided with the side plan view of the 4th pulley embodiment.

Figure 14 is that the utility model shows that slide is provided with the end plan view of the 4th pulley embodiment.

Figure 15 is the side plan view that known dumping car is installed wagon box and nerve of a covering.

The specific embodiment

The utility model is a kind of nerve of a covering device of suitable dumping car wagon box, please referring to Fig. 1, shown in Figure 2, nerve of a covering device of the present utility model is arranged at wagon box 10, wagon box 10 is provided with the driving section 20 of a binding propulsion source 21 in a side, and but wagon box 10 slide 50, that a drag-line portion 40, a horizontal slip be set in both sides respectively draws in the net frame 70, a control support device 60, a guide 80, throwing the net, to receive net, and surely guide nerve of a covering 75 to move on the spot by slide 50, guide 80 from command of execution nerve of a covering 75.

As Fig. 2, shown in Figure 3, this propulsion source 21 is arranged at wagon box 10 near headstock 13 1 ends, propulsion source 21 is the motors that link reductor, and propulsion source 21 outputting power places link the transmission bar 22 of transmission one such as chain, it is linked to a driven shaft 23 that fastens flower wheel 24, driven shaft 23 pivots are through at a bearing seat 231, and this bearing seat 231 is fixed in support 14 tops of wagon box 10 1 sides, and volume is established nerve of a covering 75 on the driven shaft 23;

As Fig. 2, shown in Figure 3, this drag-line portion 40 comprises a tension force group 30, one first round 41, one second takes turns 42, one drag-line 44, wherein, 30 of this tension force groups comprise a straining pulley 36 that is hubbed at wheel seat 361, the pedestal 33 of one tool spring 34, one driving screw 331, a plurality of sub-screws 35, one slide track seat 31, one enclosing cover 32, wherein, the slide track seat 31 that this section is H shape is arranged at wagon box 10 outsides and near bracket 14, the horizontal horizontal base plate 311 of stretching of slide track seat 31 downsides, and enclosing cover 32 is a ㄇ shape, with the corresponding slide track seat 31 of opening, aforementioned this is the pedestal 33 of ㄇ shape, its driving screw 331 that utilizes pedestal 31 bottom surfaces to extend installs this base plate 311, matching pair screw rod 35 installs base plate 311 again, shore pedestal 33 bottom sides with sub-screw 35 tops, with as shown in Figure 7, sub-screw 35 and nut 351 threads engage, move back by nut 35 pines, can adjust the length that sub-screw 35 stretches out base plate 311, the height of pedestal 33 is shored in adjusting, exposes to pedestal 33 open ends so as to spring 34, and presses on wheel seat 361, position with adjustment of tonicity wheel 36, and the corresponding slide track seat 31 of enclosing cover 32 openings is used and is clamped wheel seat 361, makes straining pulley 36 stable displacement on slide track seat 31; And

This first round 41 fastens in the driving section 20 driven shaft 23, and this second takes turns 42 as Fig. 1, shown in Figure 4, be hubbed at the free end of wagon box 10 away from headstock 13, take turns the drag-line 44 of 41,42 winding cable wire forms with first and second, and drag-line 44 is subjected to straining pulley 36 adjustment of tonicity, guarantee that drag-line 44 is subjected to the steady real transmission of the first round 41, the position by adjustment of tonicity wheel 36 is can appropriateness to change the 44 winding first round 41, second of drag-line take turns 42 tension degree;

Should be in order to the slide 50 that links drag-line portion 40 as Fig. 1,2, shown in 5, slide 50 is the approximate lamellar body forms that are ㄇ shape of section, both sides are made as first lateral plate 51 respectively, second lateral plate 52, connect first, two lateral plates 51,52 be top flat 53, this top flat 53 is in reverse to headstock 13, first, two lateral plates 51, forming the space of controlling mouth 54 near headstock 13 positions between 52, and first, two lateral plates 51,52 respectively at preceding, position, two opposite ends, back, articulate one first pulley 55 respectively, one second pulley 55 ', first lateral plate 51 is triangular in shape, and one the 3rd pulley 55 that independently is pivoted in the lower end "; and wagon box 10 both sides end faces are set to inclined-plane 11 (as shown in Figure 4); the fixing slide rail 56 of going up together on inclined-plane 11; corresponding downside is fixed glidepath 56 ' one; with first; two pulleys 55, slide rail 56 is gone up in 55 ' contact, the 3rd pulley 55 " contact glidepath 56 '; drag-line 44 1 ends as for aforementioned drag-line portion 40 are fixed on first lateral plate 51 by solid rope device 57; other end winding second is taken turns after 42, link another solid rope device 57 that these slide 50 first lateral plates 51 are provided with;

The side lever 62 that this control support device 60 has a king-rod 61 and is connected in king-rod 61 both sides hypomeres, this side lever 62 is terminal to push away contravention 63 for what be the excurvation shape;

As Fig. 5, Figure 11, should comprise two layback body 71 and outer tubes 72 that are long-armed shape in order to the frame 70 that draws in the net that links nerve of a covering 75, two elastic components 73, one joint seat 76, wherein, these layback body 71 1 ends are articulated in first of slide 50, two lateral plates 51,52, the other end be " shape; layback body 71 at the horizontal place of stretching of level for shrinking section 711; shrinking section with two layback bodies 71 installs this outer tube 72; layback body 71 ends are connected an elastic component 73 that is spring-like with 72 of outer tubes; this outer tube 72 is rolled up setting for the free end of nerve of a covering 75 different driven shafts 23; can conveniently spur nerve of a covering 75, use outer tube 72, the configuration of two elastic components 73, make the spacing of two layback bodies 71 that appropriate elastic stretch can be arranged, in addition, this is the joint seat 76 of ㄇ shape the nearly epimere captive joint of this layback body, articulates king-rod 61 tops of control support device 60 in order to its both sides;

This guide mechanism 80 comprises one first guiding piece 81, one second guiding piece 83, one the 3rd guiding piece 84, wherein, this first guiding piece 81 is as Fig. 5, shown in Figure 6, is arranged to draw in the net frame 70 layback bodies 71 inboards, and be＞shape, extending one section prominent end 82 that draws towards the corner of downside; And

83 of this second guiding pieces are arranged at the last slide rail 56 of wagon box 10, and contiguous slide 50 is positioned at propulsion source 21 initial point positions, this second guiding piece 83 is triangular shape and distributes, upside is skewed slide bar 831,56 linking number poles 832 of slide bar 831 and last slide rail, and the height of slide bar 831 is gradually high shape towards propulsion source 21, and is the support section 834 that is straight at this highest section, and this support section 834 can be drawn end 82 contacts for first guiding piece 81 prominent; And

The 3rd guiding piece 84 is as Fig. 4, shown in Figure 6, is that the madial wall at wagon box 10 extreme ends is provided with V shape pole, and towards looking closely direction horizontal-extending one push rod section 841, this push rod section 841 just can be corresponding pushes away contravention 63 contacts for control support device 60 to this V shape pole at its two free end; In addition, the utility model can be thrown the net the position and the cut-off switch 86 of throwing the net is set in the corresponding nerve of a covering 75 in wagon box 10 outsides, also can in the net position of should collect mutually receipts net cut-off switch 87 also be set again as shown in figure 12, aforementioned components is assembled into preferable example of the present utility model according to this.

When using enforcement, if the receipts net cut-off switch 87 of Figure 12 is not set, then start and continue to pin propulsion source 21 power switchs, as Fig. 1, shown in Figure 7, propulsion source 21 drives driving section 20 and drives slide 50 with the drag-line 44 that makes drag-line portion 40, make slide 50 along last, glidepath 56,56 ' slides, control support device 60 in the middle of this is to keep rising sheer from the top flat 53 of slide 50 always, be incorporated into slide 50 and draw in the net frame 70, so haul nerve of a covering 75 straight-line displacement exactly synchronously, push rod section 841 ora terminalis that contravention 63 is pushed and shoved the 3rd guiding piece 84 that push away up to control support device 60, cause control support 60 weightless hearts of device and topple over towards the 3rd guiding piece 84 directions, fall in the control mouth 54 up to controlling the king-rod 61 that supports device 60 and pushing away contravention 63, reduce and highly form Fu Xiazhuan, the interlock control is drawn in the net frame 70 and is leaned forward lowly, and slide 50 shuts down after touching the cut-off switch of throwing the net, loosen power switch again, this promptly finishes the action of throwing the net that nerve of a covering 75 covers wagon box 10, receive net cut-off switch 87 if be provided with, then press the startup power switch, need not continue to push, run into receipts net cut-off switch 87 up to slide 50 and get final product.

Otherwise, receive net as desire, then as Fig. 6, shown in Figure 10, start power switch and make drag-line portion 40 retract slide 50, draw in the net frame 70, nerve of a covering 75, draw end 82 contacts to second guiding piece 83 up to the prominent of first guiding piece 81, draw in the net frame 70 and control support device 60 gradually very to support along slide bar 831 climbings, enter support section 834 up to the prominent end 82 that draws, the king-rod 61 that makes control support device 60 shifts and gets back to top flat 53 states that stand in by control mouthfuls 54, even and slide 50 is run into receipts net cut-off switch 87 propulsions source 21 of Figure 12 and shut down.

Figure 13, Figure 14 show the another kind of embodiment of slide 50 configuration pulleys, be that slide 50 can increase the 4th complementary pulley 59, its movable property adjustment upper-lower position, use and adapt to the discrepant highly slightly situation of wagon box 10, keep upper and lower some position of slide 50 all to have pulley to contact separately on the upper and lower slide rail 56,56 ', slide fast with the stability that extremely is difficult for rocking, and the 4th pulley 59 can only be provided with one group, it comprises a nut seat 58, a pulley screw rod 581, an auxiliary block 591, an assist spring 592, wherein;

Be installed in slide 50 outsides these nut seat 58 longitudinally-movings, pulley screw rod 581 is to threadingly engage in the nut seat 58, external part is in conjunction with a locking cap 582, use and be fixed in this L-shaped auxiliary block 591, auxiliary block 591 is level to be settled for the 4th pulley 59 to the position, allow the 4th pulley 59 be hubbed at auxiliary block 591, and between auxiliary block 591 and the slide 50 and link this assist spring 592, make the 4th pulley 59 can with glidepath 56 ' bearing fit; In view of the above, dial slightly and change nut seat 58, drive pulley screw rod 581 drives auxiliary blocks 591, the 4th pulley 59 moves up and down, and just regulates contact condition according to glidepath 56 ' position and slidably.

And Fig. 2, shown in Figure 11, draw in the net frame 70 as when running into wagon box 10 bearing loads and forming the situation of bulging outwardly, but slide 50 mat elastic components 73 elastic stretching outwardly then, use the aforementioned wagon box 10 of counteracting and expand the displacement situation outwardly, really keep the slide 50 smooth and easy slip in ground of on upper and lower slide rail 56,56 ', not derailing, unlikely stuck.

Thus, according to technology contents of the present utility model, the utility model is mainly slided by drag-line portion 40 along upper and lower slide rail 56,56 ' by slide 50, be able to positively not be subjected to windage effect and the stable nerve of a covering 75 that drives moves, it will be further appreciated that, guide mechanism 80 makes slide 50 not only provide clear and definite track for slide 50 displacement movements throwing the net, receive net action, the terminal point that arrival is thrown the net, guiding is drawn in the net frame 70 and is inclined down and be inverted, determine the fixed point of throwing the net, do not need with the action of manually throwing the net, the fast and convenient function of throwing the net, receiving net automatically is provided automatically.

Though the utility model discloses with specific embodiment; but it is not in order to limit the utility model; any those skilled in the art; the displacement of the equivalent assemblies of under the prerequisite that does not break away from design of the present utility model and scope, having done; or, all should still belong to the category that this patent is contained according to equivalent variations and modification that the utility model scope of patent protection is done.

Claims (10)

1. the nerve of a covering device of a suitable dumping car wagon box is characterized in that, comprising:

One can be arranged at wagon box and the driving section of power can be provided;

One links driving section power and drag-line portion that straight line moves, and it comprises a drag-line that is driven;

One links the slide of drag-line portion, and it comprises a plurality of pulleys that can slide along wagon box one side, and this slide links drag-line and is provided with slidably to be subjected to its power, and this slide has one at least and is positioned at the top flat at top and the control mouth of adjacent this top flat;

One control support device, the side lever that it has a king-rod and is connected in king-rod both sides hypomere;

One in order to link the frame that draws in the net of nerve of a covering, and it comprises the two layback bodies and that are long-armed shape can be for the outer tube of nerve of a covering joint, and wherein, this layback body one end is articulated in slide, link this outer tube between this two laybacks body, and this layback body articulates this king-rod;

One guide mechanism, it comprises one first guiding piece, one second guiding piece, one the 3rd guiding piece, wherein, this first guiding piece is arranged at this layback body inboard, this second guiding piece that can be arranged on the wagon box has skewed slide bar, this slide bar height is gradually high shape towards this propulsion source direction, and contacting with this first guiding piece, and the 3rd guiding piece is arranged at wagon box with the corresponding side lever that touches this control support device.

2. the nerve of a covering device of suitable dumping car wagon box as claimed in claim 1, it is characterized in that, described propulsion source is arranged at wagon box near headstock one end, propulsion source links the motor of reductor, propulsion source outputting power place links transmission one transmission bar, be linked to one this fasten the driven shaft of flower wheel, described driven shaft pivot is through at a bearing seat, this bearing seat is fixed in a top of the trellis of wagon box one side, and volume is established nerve of a covering on the driven shaft.

3. the nerve of a covering device of suitable dumping car wagon box as claimed in claim 1, it is characterized in that, described drag-line portion comprise a first round, one second take turns, a drag-line, this first round fastens the driven shaft in the driving section, this second is taken turns and is hubbed at the free end of wagon box away from headstock, and described first and second taken turns this drag-line of winding.

4. as the nerve of a covering device of claim 1 or 3 described suitable dumping car wagon boxes, it is characterized in that, described drag-line portion comprises a tension force group, it comprises a straining pulley that is hubbed at wheel seat, this straining pulley is by touching in the drag-line downside, this tension force group comprises the pedestal of a tool spring, one driving screw, a plurality of sub-screws, one slide track seat, one enclosing cover, wherein, the slide track seat that this section is H shape is arranged at the wagon box outside, horizontal the stretching of slide track seat downside is provided with horizontal base plate, and enclosing cover is a ㄇ shape, the corresponding slide track seat of its opening, the wheel seat of straining pulley can be provided with slidably in interior, and this base bottom surface that is ㄇ shape connects this driving screw, described driving screw installs base plate, shores the pedestal bottom side and sub-screw installs base plate.

5. the nerve of a covering device of suitable dumping car wagon box as claimed in claim 1, it is characterized in that, the lamellar body form that described slide section is a ㄇ shape, both sides are made as first lateral plate respectively, second lateral plate, connect first, two lateral plates are top flats, first, forming the control mouth near the propulsion source position between two lateral plates, slide is first, two lateral plates are respectively at preceding, position, two opposite ends, back, articulate one first pulley respectively, one second pulley, first lateral plate is triangular in shape, lower end end one the 3rd pulley that independently is pivoted, and wagon box can be in last, downside is fixed slide rail on respectively, one glidepath, described first, slide rail is gone up in the contact of two pulleys, the 3rd pulley contact glidepath, this drag-line one end is fixed on first lateral plate, and the free end that other end winding second is taken turns also is fixed in first lateral plate.

6. the nerve of a covering device of suitable dumping car wagon box as claimed in claim 1, it is characterized in that, the side lever of described control support device is terminal, and the 3rd guiding piece is a V shape pole in order to be the contravention that pushes away of excurvation shape, and the push rod section that direction horizontal-extending one can corresponding push away the contravention contact is looked closely by its two free ends court.

7. the nerve of a covering device of suitable dumping car wagon box as claimed in claim 1, it is characterized in that, described layback body one end that draws in the net frame is articulated between first and second lateral plate of slide, the other end is and " is connected an elastic component between shape; the layback body for shrinking section, installs this outer tube in two shrinking sections at the horizontal place of stretching of level, described layback end of body and outer tube; this is the joint seat of ㄇ shape to this layback body near epimere place captive joint, and the both sides of joint seat articulate the king-rod top that device is supportted in control.

8. the nerve of a covering device of suitable dumping car wagon box as claimed in claim 1, it is characterized in that, described first guiding piece is＞shape, extending one section prominent end that draws towards the corner of downside, and this second guiding piece is the triangular shape distribution, be connected a plurality of poles between slide bar and wagon box, slide bar at this highest section for being straight support section.

9. the nerve of a covering device of suitable dumping car wagon box as claimed in claim 1 is characterized in that, the corresponding nerve of a covering in the described wagon box outside position of throwing the net is provided with the cut-off switch of throwing the net, and corresponding nerve of a covering is received the net position and is provided with one and receives the net cut-off switch.

10. the nerve of a covering device of suitable dumping car wagon box as claimed in claim 5, it is characterized in that, described slide is provided with height adjustable the 4th pulley, the 4th pulley comprises a nut seat, one pulley screw rod, one auxiliary block, one assist spring, wherein be installed in the slide outside this nut seat longitudinally-moving, the pulley screw flight is engaged in the nut seat, pulley screw rod external part is in conjunction with a locking cap, to be fixed in this L-shaped auxiliary block, auxiliary block is level and settles the 4th pulley to the position, the 4th pulley is hubbed at auxiliary block, and auxiliary block and slide link this assist spring two ends respectively.

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