JPS6310018B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a powder transport vehicle, and more particularly, a plurality of trailers with different discharge methods are selectively connected to a single tractor equipped with a plurality of hydraulic pumps, and a plurality of trailers with different discharge methods are selectively connected to one tractor equipped with a plurality of hydraulic pumps. It is designed to transport and discharge powder and granular materials in accordance with the above.

In general, in order to reduce transportation costs, powder and granule transport vehicles that use tractors and trailers to transport large quantities of powder and granules are equipped with a hydraulic pump on the tractor side, and a hydraulic pump on the trailer side. The powder and granules in the storage tank mounted on the vehicle frame are discharged to the outside by driving a screw conveyor via a hydraulic motor connected to the hydraulic pump on the tractor side.

By the way, there are two ways to discharge powder and granules from a storage tank mounted on the trailer side: to discharge to a high place such as a silo (hereinafter referred to as high place discharge), and to discharge to above ground such as underground equipment (hereinafter referred to as fall discharge). ). Therefore, the number of screw drive hydraulic motors changes in response to these different discharge methods, resulting in excess or deficiency in the discharge volume of the hydraulic pump installed on the tractor side. The disadvantage is that a tractor equipped with a hydraulic pump whose discharge amount can be set according to the above-mentioned conditions must be prepared separately.

The present invention has been made in view of the above points, and includes a plurality of hydraulic pumps that are driven simultaneously on the tractor side, and the discharge side and suction side of one hydraulic pump are connected to the other side in response to falling discharge or high place discharge. It is configured so that it can be connected to the suction side of a hydraulic pump, and allows a single tractor to pull trailers with different discharge methods, such as vertical discharge or high-place discharge, to discharge powder and granular materials.

Embodiments of the present invention will be described below based on the drawings. In FIG. 1, 1 is a tractor equipped with an engine and a plurality of hydraulic pumps to be described later, and a coupler 3 is provided at the rear of the tractor. A trailer 2 can be connected and towed. On the other hand, a powder storage tank 5 is mounted on the frame 4 of the trailer 2 towed by the tractor 1, and two different discharge methods are set for the storage tank 5 depending on the customer's specifications. has been done. That is, as shown in FIG. 1, the storage tank 51 that allows discharge to a high place has a bottom screw 6 over the entire length of the bottom of the storage tank.
F, 6R are arranged, and the bottom screws 6F, 6R are arranged.
Vertical screw 7 for upward conveyance at the rear end of R
A discharge screw 8 is connected to the upper end of the vertical screw 7 and is rotatable in both vertical and horizontal directions. The granules are discharged into a silo, etc.

On the other hand, as shown in FIG. 2, the storage tank 52 that allows for downward discharge has only bottom screws 6F and 6R disposed along the entire length of the bottom of the storage tank, and a discharge port that can be opened and closed by a shutter (not shown) at the rear end. The bottom screws 6F and 6R are driven by a hydraulic motor, which will be described later, and discharged to underground facilities or the like.

Next, the hydraulic circuits for high-place discharge and downward discharge will be explained with reference to Figures 3 and 4.
The figure shows the hydraulic circuit when the storage tank 51 that enables high-place discharge is connected to the tractor 1. The left side of the vertically drawn imaginary line is the tractor 1 side, and the right side is the trailer 2 side (see Figure 4 below). The same applies to A plurality of hydraulic pumps 10 and 11 are provided on the tractor 1 side as a source of pressure oil, and are simultaneously driven by an engine (not shown).
The discharge amount per rotation of the hydraulic pump 11 is set to be larger than that of the hydraulic pump 11.

The discharge side end and suction side end of each hydraulic pump 10, 11 are provided with pipe joints A, B,
Further, on the suction side of the hydraulic motor 10, pipe fittings E and F are arranged in parallel with the pipe fitting D.

By the way, on the trailer 2 side, a pipe joint a connectable to the discharge side pipe joint A of the hydraulic pump 10 is opposed, and the pressure oil from the hydraulic pump 10 is passed through the high-pressure main pipe 13 to the switching valves 17 and 19. By switching the switching valve 17, the hydraulic motor 20 for the discharging screw 8 and the hydraulic motor 21 for the vertical screw 7, which are connected in series, are rotated in the forward and reverse directions. The undulation cylinder 24 that controls the undulation angle of the charge screw 8 is expanded and contracted.

Further, on the trailer 2 side, a pipe joint b connectable to the discharge side pipe joint B of the hydraulic pump 11 is opposed.
Pressure oil from the hydraulic pump 11 can be supplied to the switching valve 18 via the high-pressure main pipe 14, and the switching operation of the switching valve 18 causes the hydraulic motors 22, 23 for the bottom screws 6R, 6F to rotate forward.

Note that 12 is an oil reservoir provided on the trailer 2 side, and the hydraulic pumps 10 and 11
Pipe fitting d that can be connected to suction side pipe fittings D and C of
and c are facing each other, and each low pressure main pipe 16
and 15 to the oil reservoir 12.

Next, the hydraulic circuit when the storage tank 52 and the tractor 1 are connected to each other, which enables drop discharge, will be explained with reference to FIG. 4. First, the discharge side pipe joint B and the suction side pipe joint C of the hydraulic pump 11 are are connected to the suction side pipe joints E and F of the hydraulic pump 10, respectively, and the discharge side pipe joint A and the suction side pipe joint D of the hydraulic pump 10.
A pipe joint a' provided at the end of the high-pressure main pipe 14' and a pipe joint d' provided at the end of the low-pressure main pipe 15' on the trailer 2 side are connected to the pipe joints 1 and 2, respectively. At this time, in order to ensure that the pipe joint a' is connected to the corresponding pipe joint A, the pipe joint A and the pipe joints D, E, and F are set to have different sizes.

Therefore, the oil reservoir 1 on the trailer 2 side
The pressure oil from 2' is sent to the high pressure main pipe 1 from the hydraulic pump 10.
The hydraulic motors 22 and 23 for the bottom screws 6R and 6F rotate normally by the switching operation.

In this case, the pressure oil from the hydraulic pump 11 returns to the hydraulic pump 11 again, resulting in no-load operation in which it simply circulates.

Note that the discharge side pipe joint A of the hydraulic pump 10 is different in gender and size from the discharge side pipe joint B of the hydraulic pump 11, and since only the trailer side pipe joint a or a' is always compatible, there is a risk of incorrect operation. There is no.

In addition, when connecting the discharge side and suction side of the hydraulic pump 11 to the suction side of the hydraulic pump 10 in response to drop discharge, the hydraulic pump 1
Since high pressure does not act on the suction side of the hydraulic pump, damage to the hydraulic pump can be prevented.

Further, although the oil reservoir was installed on the trailer side, there is no difference in effectiveness even if it is installed on the tractor side.

As described above, according to the present invention, one tractor can handle a plurality of storage tanks with different discharge methods, and it is possible to reduce the transportation cost of powder and granular materials.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall side view of a powder transport vehicle in which a storage tank that enables high-place discharge is connected to the tractor side, and FIG.
The figure is an overall side view of a powder transport vehicle with a storage tank connected to the tractor that allows for drop-in discharge.
FIG. 3 is a hydraulic circuit diagram of the powder transport vehicle shown in FIG. 1, and FIG. 4 is a hydraulic circuit diagram of the powder transport vehicle shown in FIG. 1... Tractor, 2... Trailer, 5... Powder storage tank, 10, 11... Hydraulic pump, A,
B, C, D, E, F...Pipe fittings.

Claims (1)

[Scope of Claims] 1. First and second hydraulic pumps that are driven simultaneously are installed on the tractor side, and on the other hand, on the trailer side, each corresponds to discharge from a high place into a silo, etc. or discharge into an underground facility, etc. A trailer in which a first storage tank and a second storage tank each equipped with a screw conveyor driven by a hydraulic motor are mounted on a vehicle frame, and the first storage tank or the second storage tank is mounted. When discharging powder and granular materials from the second storage tank corresponding to the above-mentioned drop-in discharge, the discharge side and suction side of one hydraulic pump are used. A powder transport vehicle configured so that one side can be connected to the suction side of the other hydraulic pump. 2. The granular material transport vehicle according to claim 1, wherein of the first and second hydraulic pumps, the discharge amount of one of the hydraulic pumps is larger than that of the other.