The tilting mechanism of the truck

 

(57) Abstract:

The inventive tilting mechanism includes pivotally mounted on the frame 1 dump truck telescopic hydraulic cylinder 2 unilateral actions with multiple retractable plungers. In the lower part on the outer surface of the plungers made of annular grooves, which uses two cylindrical guides of the liner 16 and 18, having the opportunity to interact face surfaces with locking ring elements (spring rings 14 and 21, limiting axial movement of the plunger. At the ends of both rails liners 18 the last of the plunger is made of faceted protrusions having the form of a blunt wedge. The distance n between the adjacent cylindrical protrusions at the interface between a faceted lugs of the opposite ends of these inserts is less than the distance m between the ends of the liners of the other plungers in a symmetric position relative to the axis of the cylinder 2, which ensures the maintenance of excessive pressure in the cuff 12 at the jerks of the platform 5. 6 Il.

The invention relates to dumping vehicles and relates to a tilting mechanism that serves to shear the use of telescopic hydraulic cylinder single acting with multiple retractable plungers (ed.mon. N 1197883, N 1472308, CL 60 P 1/16).

Known such tilting mechanisms trucks the closest structure is the tipping mechanism containing pivotally mounted on the frame of the dump truck telescopic hydraulic cylinder single acting with multiple retractable plungers, the last one having the smallest diameter, hinged to the platform, and each plunger is made annular groove in which there are two cylindrical guides of the liner having the opportunity to interact face surface with a locking ring element limiting axial movement of the plunger [1] . All guides liners of this cylinder are the ends of the flat facing each other with the surfaces, the distance between them is large enough to ensure free passage of working fluid from mismanage space in the inner cylinder chamber when the extension of the plungers in the opposite direction when folding. The extension of the plungers is limited to the aforementioned locking ring element, which abuts with its end face guide liners.

However, at the end of the unloading of the truck the platform it creates relative to the hinge platform rotation moment consequently instead of squeezing effort on the cylinder occurs dynamic tensile stress. In the result of the influence of tensile forces last retractable plunger of the hydraulic cylinder is extended force (platform) with great speed, the working fluid coming from the pump while running, no time to fill the expanding inner cavity of the cylinder, resulting in the internal cavity occurs depression, which in turn leads to the entrainment of air from the atmosphere through the sealing elements (cuff, cleaner) last retractable plunger. After unloading when lowering the platform, and in the following cycles of discharge formed in the inner cavity of the cylinder a mixture of air bubbles and fluid (emulsion) out through the sealing elements of the plungers in the form of foam, forming streaks on the body of the cylinder. This disadvantage leads to increased consumption of scarce working fluid as a result of her need for periodic refilling the tank, and in some cases causes a squeezing or pulling the cleaners.

The purpose of the invention is to enhance reliability of the tipping mechanism saii sticky cargo during unloading of the truck.

This is achieved by the fact that the tipping mechanism of the truck containing pivotally mounted on the frame of the dump truck telescopic hydraulic cylinder single acting with multiple retractable plungers, each of which is made annular groove in which there are two cylindrical guides of the liner having the opportunity to interact with their ends with locking ring elements, limiting axial movement of the plunger, the ends of both rails liners last of the plunger having the smallest diameter, made of faceted protrusions having the form of a blunt, i.e., a truncated wedge, the distance between adjacent cut-mentioned protrusions liners when pairing between a faceted lugs of the opposite ends of these inserts is less than the distance between the ends of the liners of the other plungers in a symmetric position relative to the axis of the cylinder.

With this technical solution guide liners last plunger play the role of a piston, which creates excessive pressure of the working fluid in the sealing element of the piston in the event of an abrupt excess of its speed of movement when you pull the platform at the end of Razguliay, having the ability to go from the cylinder to the outside through the sealing elements. Moreover, the implementation of the ends of the guide liners last of the plunger in the form of a blunt wedge prevents the influx of metal at the ends of these liners during their interaction with the retaining ring elements, limiting axial movement of the plunger, and thereby guaranteed the permanence of the gap between the ends of the guide liners last of the plunger, which ensures the stability characteristics of the flow when the flow of the working fluid during normal stroke of the hydraulic cylinder.

In Fig. 1 shows a truck, at the time of discharge, and Fig. 2 - cylinder tilting of the platform mechanism (transport position); Fig. 3 - node I in Fig. 2; Fig. 4 - node II in Fig. 2 (the position of the focus pull-out link); Fig. 5 - section a-a in Fig. 2; Fig. 6 is a view along arrow B in Fig. 5 (side view on the guide liners last plunger).

On the frame 1 articulated dump truck equipped with telescopic hydraulic cylinder single acting 2 with multiple retractable plungers 3, namely the plungers 3.1 and 3.2. The last of the plunger 4, hinged to the platform 5. In the rear part of the platform 5 has swest rear side with a bevel, preventing loss of cargo while driving. Such platforms bucket type characteristic of the trucks. Near the cylinder 2 mounted restrictive valve 7, perepustili working fluid to drain at the end of the cylinder to eliminate water hammer. In addition, the frame is fitted with a safety device 8, usually in the form of a steel flexible cable. The other end of the cable secured to the underside of the platform 5. Belay device 8 is stretched after the limit valve 7, however, until full extension of the plungers 3 and 4 of the cylinder 2. It protects swivel 9 body 10 and the plunger 4 of the cylinder 2 from destruction in case even after the termination of the supply of operating fluid under pressure platform under the action of slipping sharply cargo continues to rise (the jerk at the end of discharge).

To seal and support the upper end of the plunger 4 has a guide sleeve 11 is made of antifriction material, the cuff 12 and the cleaner 13, located in the penultimate plunger 3.2. A similar bearing and sealing elements are placed in the housing 10 and in another drawer plunger 3.1. In the housing 10 and the plungers the LEC circular cross-section, limiting the stroke of the plungers 3 and 4.

In the lower part on the outer surfaces of the plungers 3 are annular grooves 15, which uses two cylindrical guides of the liner 16, which interacts with the response, the inner surfaces of the covering of the plunger and the housing when the extension of the plungers. The distance m between the ends of these inserts in a symmetrical position relative to the axis of the cylinder provides free passage of fluid between the respective misonnei spaces and an internal cavity b of the hydraulic cylinder.

In the annular groove 17 on the outer surface of the latter plunger 4 is installed rails liners 18, the ends of which are made of faceted lugs 19 having the shape of a blunt wedge with bevels 20. The distance n between adjacent cut tabs liners 18 when pairing between a faceted lugs of the opposite ends of these inserts is less than the distance m between the ends of the liners 16 if their symmetric arrangement relative to the axis of the cylinder. The value of the distance (gap) n is selected so that it does not affect the flow of working fluid between messonnier space b and the internal p is iza 21, a similar retaining ring elements 14. End surface 22 of the liners 16 and 18 on both sides is made conical. In the lower part to the body 10 of the cylinder 2 by means of a threaded coupling attached to a removable plate 23 with a sealing element 24. The bottom 23 is made integral with the lug 25, which has a hinged connection 9 for mounting the cylinder on the frame 1, and on top of the last of the plunger 4 is fixed to the cylinder 26, which is made similar to the pivot joint 9 of the cylinder 2 with the platform 5. The working fluid is supplied into the cylinder 2 through a flexible hose 27, the tube 28 attached to the housing 10, and a hole 29 in the housing wall.

The mechanism works as follows. When the flow of operating fluid from the pump in the discharge process (platform 5) it enters the cylinder 2 through a flexible hose 27, the nozzle 28 and the opening 29 in the housing 10. Next the liquid through mizunoe space and the gap m between the ends of the inserts 16 is supplied into the inner space b of the hydraulic cylinder. Under the pressure of the working fluid the whole package plungers starts to move, while the axial force on the last plunger 4, acting on the platform 5, is transmitted from covering conicelli form liners 16 and 18. Occur in the contact load g (Fig. 3) is directed into the body of the plungers 3 and 4 and gives stability to the liners 16 and 18, which transmit the load on the plungers 3 and 4 through the upper ends of the annular grooves 15 and 17. When you achieve the greatest plunger 3.1 extreme position, i.e. the position at which the upper end surface 22 of the inserts 16 comes in contact with the corresponding locking ring element 14. Occur in the contact load f (Fig. 4) is directed into the body housing 10, which gives stability to the element 14, except for his pulling out of the groove. After full extension of the largest plunger begins to move the other plunger 3.2, and after it stops (in the same way as described above) extends past the plunger 4. In the nomination process of the plungers 3 working fluid from Misonix spaces and flows freely into the internal cavity of the cylinder due to the gap m between the ends of the liners 16.

In the process of extension of the plunger 4 in the normal discharge that happens at a gradual emptying of the platform 5 from easy sipusers cargo such as dry sand, gravel, speed of extension of the plunger is determined by the pump capacity of the hydraulic tilting mechanism. At this speed rabh">

However, when unloading sticky goods (raw clay, asphalt, and so on), and rock is not gradual pouring in, and the sharp slide of the total weight of the cargo after the angle of inclination of the platform 35-38abouti.e. in the nomination process last of the plunger 4. In this period of weight through the rear overhang 6 platform 5 (shown in Fig. 1) there is the overturning moment due to the action of the force P of the mass located in the cargo platform on the shoulder g of the center of gravity of the load to the axis "O" of hinge rotation of the platform 5 with respect to the frame 1 (MODA= =WG). Based on the kinematics of the tipping mechanism, in this moment on the cylinder 2 instead of squeezing effort, ruling the entire period of discharge, tension arises Q (Q = = (Q= = ).). As a rule, due to the dramatic nature of the sliding cargo shift compressive efforts on the cylinder tensile happens with dynamic impact. It is necessary to take into account the fact that the bevel of the platform 5 leads to inhibition of the cargo at its slipping, along with a rear overhang 6 further improves the dynamics of sapacitabine platform 5.

When crowding of the platform due to hang sticky cargo last plane time in a timely manner to fill the vacant space inside the cylinder, resulting in the cylinder decreases pressure, which may be less than atmospheric. In this case, the guide inserts 18, moving inside the previous plunger, act as a piston pump, while maintaining the desired excess pressure in the cuff 12 to avoid the entrainment of air into the cylinder through the sleeve during movement of the latter plunger.

For tipper trucks three-way side unloading this problem is no less relevant, since the lateral unloading cargo passes through suspended on chains the side (to avoid sprinkling under the wheels), so that the shoulder g, which applies a force P is very large. In the process of lowering the empty platform 5 (folding plungers), the working fluid flows in the reverse direction, that is, flows from the internal cavity b of the hydraulic cylinder in Messinia space and in normal speed. This slowing effect in the process of folding the last of the plunger 4 has no effect.

The proposed construction, providing an exception breakthrough platform during unloading, improves the integrity and reliability of sealing elements retractable plungers for contigiani cylinder and a safety device 8, sensitive to dynamic tensile stresses resulting from the jerks platform. In addition, the implementation of the ends of the liners 18 faceted, shaped like a blunt wedge, eliminates the change of the gap n during operation. Due to the action of the load g and f, given the linear contact between the toroidal surfaces of the rings 14 and 21 and the conical end surfaces 22 of the inserts 18, along the line of contact experience significant stress, leading to deformation, i.e., to the influx of the metal in the direction of the gap n.

The presence of the bevels 20, which may extend the flows of metal in cold working, completely eliminates the change of the distance n between the ends 19 of the liners 18 during operation.

The TILTING MECHANISM of the TRUCK containing pivotally mounted on the frame of the dump truck telescopic hydraulic cylinder single acting with multiple retractable plungers, the last of which, with the smallest diameter, hinged to the platform, and each plunger is made annular groove, which is equipped with two cylindrical guide liner interoperable end surfaces with locking ring elements, limiting the OS is done cut the tabs on the form of a blunt wedge, the distance between adjacent cut tabs liners when pairing between a faceted lugs of the opposite ends of these inserts is less than the distance between the ends of the liners of the other plungers in a symmetric position relative to the axis of the cylinder.

 

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