Device for limiting the angle of tilt of the platform truck

 

(57) Abstract:

Usage: in dump vehicles. The device comprises a valve 1, which is used for communications to the working cylinder cavity tilt platform with sink when the platform limit angle. The stem 2 of the valve has an actuator by means of the cable 6, one end of which is connected with the platform and the other end covers the finger 7 installed with different clearances in the holes 8 and 9, made in the side walls of the bracket 10 fixed to the frame. The finger 7 is fixed against axial displacement in the lateral wall of the bracket 10, and another side wall of the bracket on the finger 7 fixed plate having a shelf 16 that communicates with the stem 2 of the valve 1. This plate 13 is fixed from rotation relative to the bracket. 1 C.p. f-crystals, 7 Il.

The invention relates to dumping vehicles and relates to devices for limiting the angle of tilt of the platform of the dump truck.

The use of the device for limiting the tilting platform (stroke cylinder) due to the following circumstances. The angle of the platform regardless of the load side (back or on the side) typically perform 50aboutthat provide riodialogue lowering (return) empty platform. At the same angle of inclination of the platform to the desired stroke of the hydraulic cylinder when unloading on the side lower than when unloading ago, because of rectangular (in plan) form of the platforms and the different kinematics of the mechanism of rotation of the platform. Thus, when the rear unloading truck using almost the entire stroke of the hydraulic cylinder, and when the lateral unloading is only part of its course, about two-thirds.

To limit the stroke of the hydraulic cylinder when unloading on the side of the valve is used, the straddle pump and pressure hydroline feeding cylinder, when the platform limit angle. For the drive shaft (gate) of the specified valve in some cases it is advisable to use a flexible connection, such as cable or chain [1, 2, 3]. The valve that separates the cylinder chamber from the pump, is generally used in tractor trailers, dump trucks with single hydraulic system. However, when using this valve a dynamic load (hydraulic shock) at the time of disconnection of the pump and the pressure hydroline, resulting in a reduction in the reliability of hydraulic system and primarily the most sensitive to overloading hydroagrigate force, that reduces the reliability of the valve. A device for limiting the angle of tilt of the platform truck containing placed on the frame of the dump valve with the rod that is designed to limit the stroke of the hydraulic cylinder is used to tilt the platform relative to the frame, and the actuator includes a plunger, located on the frame, and a flexible element, one end of which is connected with the platform, and the other end with the plunger [4]. When the valve he communicates with the discharge pressure hydroline, thereby limiting the stroke of the hydraulic cylinder until the platform a maximum slope angle. The valve is triggered also when the rear unloading, preventing the thrust of the hydraulic cylinder, and hence the hydraulic shock in the hydraulic system at the end of his turn.

Such devices are most prevalent in cars-trucks with two-wire system. However, this technical solution together with the exception of the hydraulic shock observed dynamic load tensile flexible element (rope), which in addition to the valve actuator performs the function and safety element that prevents crowding of the platform after the valve opening with a sharp slide Salies rear overhang platform (rear discharge) or through the outer edge of the lateral side (side discharge), forms the axis of rotation of the platform the moment, leading to a sharp further rotation of the platform and pulling the plungers of the hydraulic cylinder due to its free motion, until completely stretched rope and will not restrict inadvertent rotation of the platform, while the dynamic load caused by damping the kinetic energy of the moving platform.

In addition, this device is very cumbersome and bulky in the manufacture.

The problem solved by the invention is to improve the reliability of the device for limiting the angle of tilt of the platform of the truck, ensuring compactness and reduction of the consumption of this device.

To solve this problem in the device for limiting the angle of tilt of the platform truck containing placed on the frame of the dump valve with the rod that is designed to limit the stroke of the hydraulic cylinder is used to tilt the platform relative to the frame, and a valve actuator including a plunger, located on the frame, and a flexible element, one end of which is connected with the platform and the other with the plunger, the plunger is made in the form of finger plate covered by another end of the flexible element and ustanovlenno one wall bracket with a smaller gap between it and the finger last fixed against axial movement, for other wall brackets on the pinned this plate having a shelf, interacting with the rod, the movement of the plate along a wall bracket is limited to the direction parallel to the rod. The actuator of the valve stem with a flexible element, one end of which is connected with the platform and the other end comprises a finger mounted with different clearances in the holes formed in the side walls of the bracket fixed to the frame, and having on the end plate with shelf opposite the valve stem with the opportunity to interact with him during the limited angular movement of the finger within different-sized gaps in the holes formed in the side walls of the bracket, allows the device to absorb dynamic loads, hold down the platform from sapacitabine when its movement by inertia after the message of the pressure hydroline and, accordingly, the working cylinder cavity with sink, especially when sliding sticky cargo from the end of the platform, with the resulting dynamic loads are transmitted via flexible element, the finger and the bracket directly on the frame and does not affect the valve. Device for limiting the angle of tilt of the platform at the specified execution is a vet. To ensure a smooth limit of the stroke of the hydraulic cylinder to reduce the dynamic loads at the time of actuation of the flexible valve element can be made in the form of rope with a loop at the end, covering the said finger located in the holes of the wall bracket, and the middle part of the cable can be connected with the platform by means of a tension spring, while in the hydroline connecting the valve with drain, can be installed choke.

In the presence of such spring that is connected to the middle part of the rope and with the platform, at the expense of a delay line of spring is its smooth tension as tilt platform, resulting in the gradual opening of the valve, resulting in a steady increase in drain the fluid from the pressure hydroline, which is additionally regulated by the orifice installed in the drain hydroline.

In Fig. 1 shows a vehicle-dump truck when unloading ago, side view; Fig. 2 - the same, when unloading on the side, rear view, and Fig. 3 - node I in Fig. 2; Fig. 4 is a view along arrow a in Fig. 3; Fig. 5 - the position of the Cam follower at the end of the tilting platform of Fig. 6 is a view along arrow B in Fig. 5; Fig. 7 is a diagram of the device.

Device the platform 4 with respect to the frame 5 of the dump truck. The valve 1 has an actuator in the form of a flexible element, a cable 6, one end of which is connected with the platform 4, and the other end covers the finger 7 installed with different clearances in the holes 8 and 9, made in the side walls of the bracket 10 fixed to the frame 5. The finger 7 is fixed against axial movement in one of the side walls of the hole 8 with a smaller gap through pins 11 and washers 12. At the other end of the finger 7 from the side of the hole 9 having a larger gap is fixed by welding the plate 13, is fixed from rotation relative to the bracket 10 by means of made her retainer 14 that communicates with an elongated opening 15 in the side wall of the bracket 10. The latch 14 may be performed either in the form of a bent end of the plate 13 (see Fig. 3), either in the form of a rod fixed in the plate 13. The plate 13 has a shelf 16 in contact with the rod 2 through the adjusting bolt 17 and a nut 18, which serve to adjust the moment of actuation of the valve 1. In the middle part of the cable 6 is connected to one end of the spring 19 is stretching the other end of which is mounted on the platform 4. The valve 1 is connected pressure hydroline 20, the feeding cylinder 3, and the drain hydroline 21, in which is mounted a throttle 22. Clap the m is in communication with the pressure hydroline 20, and the cavity 25, which has a stem 2, with a drain hydroline 21.

The device operates as follows.

When the rear unloading the truck (Fig. 1) is used in almost full stroke hydraulic cylinder 3, while before the limit is reached (50about) the angle of inclination of the platform 4 cable 6 under the action of the rotating platform 4 and the spring 19 begins to affect the finger 7, the position of the "C" arrow deflection f. Under the action of the rope finger 7 is moved in the holes 8 and 9 within the gap between him and the wall to lock the shelf 16 of the plate 13 in the bolt 17 is screwed into the piston rod 2. However, the stem 2, which is loaded by a force from the action of the pressure in the cavity 24 and the spring of the shutter 23, balances the tension force of the cable 6. Upon further rotation of the platform 4, the deflection of the cable 6 is reduced to a value of e, the cable takes the position d, the spring 19 is stretched, which leads to an increase in tensile forces in the cable 6 to the extent necessary to release the rod 2 of the shutter 23. At this point, the finger 7 is moved (rotated) within a larger gap in the hole 9, while a small gap in the hole 8 only provides freedom of rotation. This plate 13 attached to the finger 7, moved and settled along the wall brackets, except for its rotation about the axis of the finger 7. When moving rod 2, the shutter 23 is released from its seat and the working fluid from the pressure hydroline 20 through the cavity 24 and 25 of the valve 1 flows into the drain hydroline 21. The choke 22 installed in the drain hydroline 21, provides the pressure drop at rated flow less, but commensurate with the pressure in the hydraulic system at the end of the discharge, which eliminates the sharp pressure drop at the moment of actuation of the valve 1 and makes the operation smooth. The finger 7 is moved (rotated) in the hole 9 all the way to the wall bracket, and the shaft 2, acting on the shutter 23 has a free running and therefore no load on the valve body 1. When the valve 1, the pressure in the hydraulic system is reduced to the magnitude of the pressure drop across the orifice 22, the working fluid ceases to flow into the cylinder chamber 3, the platform stops, while the cylinder remains free running and the cable 6 is not fully stretched, i.e., retained a certain amount of deflection of. The same sequence is observed when the lateral unloading so that the cable 6 with rear unloading takes the position "a" (Fig. 5), and when the lateral unloading position "b".

Frequent inertia or under the action of the rest of her cargo, abruptly slipping at the end of the lifting platform. This cargo passing through the edge of the rear overhang of the platform (rear discharge) or through the edge of the side Board (side discharge), creates the axis of rotation of the platform turning point. Inhibiting and limiting element in this case is the cable 6, the force which gradually increases as it moves the platform up to its full stop. However, due to the interaction with the spring 19 cable 6 even under dynamic jerks platform is not fully straightened, keeping at least a small deflection in the cylinder 3 remains free play. In addition, the spring 19 performs the function of folding the cable 6 in the transport position, preventing it from tangling or unwanted contact with the aggregates of the truck.

Thus, the invention provides full discharge valve 1 from the efforts arising from the crowding of the platform, as the tensile stress occurring in the cable 6 after moving the finger 7 within the gap in the hole 9, is passed directly to the bracket 10 fixed to the frame 5 of the truck, and the stem 2 of the valve 1 when this keeps stock of free running. In addition, the throttle 22 is especial smooth damping of the leap platform at the end of unloading, which is beneficial to the reliability of the hydraulic system and a safety mechanism for preventing the crowding of the platform. It should be noted that this effect is achieved a compact device having a minimum number of parts, is small in intensity and complexity of manufacturing.

1. DEVICE FOR limiting the ANGLE of TILT of the PLATFORM TRUCK containing placed on the frame of the dump valve with the rod that is designed to limit the stroke of the hydraulic cylinder is used to tilt the platform relative to the frame, and the actuator includes a plunger, located on the frame, and a flexible element, one end of which is connected with the platform and the other with the plunger, characterized in that, in order to increase reliability while ensuring compactness and the reduction of material, the plunger is made in the form of finger plate covered by another end of the flexible element and installed with different clearances in the holes, made in the side walls of the bracket fixed to the frame, and one wall bracket with a smaller gap between it and the finger last fixed against axial movement, the other wall of the bracket on the pinned specified plates the Board, parallel to the stem.

2. The device under item 1, characterized in that the flexible element is made in the form of a rope with a loop at the end, covering the finger, and the middle part of the rope is connected with the platform by means of a tension spring, while in the hydroline connecting the valve with drain, set the choke.

 

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