JPS59118415A - Controller for drive of mixer drum of mixer car - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive control device for a driven body such as a mixer drum mounted on a concrete mixer truck. This relates to a drive control device e which improves work efficiency by reducing the number of discharges as much as possible and allows free setting of discharge conditions.

A general concrete mixer truck has a mixer drum rotatably mounted on the vehicle body, and uses power from the vehicle's engine to drive forward rotation, stop, reverse rotation, and increase/decelerate rotation through a drive device. The inner wall of the mixer drum is used to load concrete, mix it while it is running, mix it up, and discharge it at the pouring point.

In order to perform the above operations, two screw blades made of screw ribbons are installed with a phase difference of +80'. In order to correspond to the engine rotation speed and output related to the vehicle running condition and the rotation speed and power required for various operations of the mixer drum in that condition, a unique linked drive system and electric control system are used between the two. There is an intervening δ.

When discharging fresh concrete by reversing the mixer drum, pulsations occur in the discharge amount depending on the angular position of the screw blade.

This vein affects the total discharge time of 11J fresh concrete,
It also varies depending on the slump value of fresh concrete, which worsens the discharge efficiency.

The present invention improves the discharge efficiency by minimizing the pulsations in discharge of fresh concrete and equalizing the L″c discharge speed. The aim is to improve the efficiency of construction work and to make the use and handling of ready-mixed concrete more convenient.

In order to achieve this speed-up, the mixer drum instep motion control device of the present invention includes a mixer drum rotatably mounted on the vehicle body, a drive device for forward and reverse rotation of the mixer drum, and a drive device for rotating the mixer drum in forward and reverse directions. It consists of a control device that detects the rotational phase, changes the rotational speed approximately every rotation, and changes the rotational speed change timing and rotational speed ratio according to the slump value of the fresh concrete. It is a feature.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be explained specifically and in detail with reference to the accompanying drawings.

Figure 1 shows a side view of a concrete mixer truck. , reverse rotation, acceleration, and deceleration. In this example, the drive device (3) is a power extraction device (5) called PTO from the vehicle's engine (4).
A hydraulic motor (7) is connected to the mixer drum (2) and rotates by receiving pressure oil from a reversible variable displacement pump (6) such as a swash plate pop which can be rotated through the mixer drum (2).

As shown in Figure 2, the reversible variable displacement pump (6) is operated via an information processing device including a microcomputer, which is operated by an operator (8) inside the vehicle and an operator (9) outside the vehicle. It is connected to the control motor (b) to control the discharge direction, oil pressure, and discharge timing of the pressure oil. The direction and speed, the amount of change in speed during rotation, the timing of change in speed, etc. are controlled.

In order to maintain the rotation of the mixer drum at the optimal rotation suitable for each operation regardless of changes in the vehicle's stoppage state, the mixer drum (2) is connected to the controller (8) inside the vehicle or outside the vehicle. The operation device (9) is provided with a rotation speed control knob (to) for the mixer drum (2), a slump control knob for fresh concrete θQ, and a rotation angle phase knob for the mixer drum (2). The rotation of the mixer drum (2) is performed by inputting a rotational phase reference signal from the rotational phase sensor (1) and setting signals from each control knob αQqYαη1.

FIG. 8 shows a partially broken mixer drum (2) to show the internal structure related to the invention. Two ribbon-shaped screw plates (18AX 18B) extending from the front to the rear of the mixer drum (2) are approximately 180 mm wide.
The awns are planted with a phase difference of °.

A cylindrical feed chute (4) used for loading fresh concrete material is installed in the center of the rear opening a of the mixer drum (2).
The outer periphery of the screw plate' (+81 (18B)
17-) Not fully supported by the rear end. The inner edge of the foot chute and the screw plate ° (18A) (18
A partial triangular extension chute Q+) extending over the inner edge of B) is provided. The remaining part is opened and becomes an annular discharge port between the mixer drum (2) and the feed shoe 11).
It leads to By rotating the mixer drum (2) in the reverse direction, the mixed concrete of Hakushu 3 is scraped upward from the screw plates (18A) and (18B) alternately, passing through the opening of II and forming a ring. Discharge from the outlet device: 8.

Figure 4 0) (B) (U (B) is the cut in the mixer drum (2) when viewed from the rear groove opening (6) of the mixer drum (2)) One rotation in the reverse direction shown by (R) between 1 and 90', i.e. the forward rotated screw blade (1
8A) The angular phase position of (18B) and the seventh position e are υ
1 General i of ready-mixed concrete (C) pots that are being released
Shows the J relationship. Fig. 4 shows the rotation angle phase of ) and ←→, respectively.
18B) has the maximum amount of fresh concrete pushed into the river from the discharge port (E), and the discharge amount is 1 larger as shown by the arrow CD), but the rotation angle phase of In the case, the fresh concrete carried by the screw blades (18A) and (18B) is discharged from the outlet @t.
This transition is underway, and emissions will be small or non-existent. Therefore, even if the mixer drum reversely rotates at a constant speed, the fresh concrete will be discharged in a continuous manner.

Figure 5 (() (b) Fresh concrete υj discharged from the rear opening θ of the mixer drum (2) at G−→
C) is the screw blade (
+8).

Figure 5 shows the case of high slump value fresh concrete, where the fresh concrete is soft and screw grade (18A
) (18B) begins to leak out from the gap.

(FIG. 5(b)) (l- is the intermediate discharge start timing of high slump value fresh concrete shown in No. 111 and low slump raw concrete described later) in the case of medium slump value raw concrete.

Figure 5 (c) shows the case of low-slump ready-mixed conocrete, where the flow resistance is large due to the hardness of the ready-mixed concrete, and the screw blade (IgA) (18E) is pressed down to form a sufficient discharge path. Ejection cannot be started, and the timing to start ejection is delayed.

That is, the angular phase position t of the screw plays (18A) (18B) and the discharge start time of the fresh concrete (C) σ)] differ depending on the slump value t. Therefore under the same operating conditions? The time required to pour the same amount of fresh concrete into the vP river varies depending on the slump value t.

Furthermore, even if the slump value is the same, the timing at which extraction begins varies depending on the amount of fresh concrete in the mixer drum (2), and generally a delay occurs when rABt becomes low.

In the present invention, the angular phase of each A-rotation of the mixer drum (2) is detected by a rotational phase sensor 0e from the vicinity of the mixer drum (2) of the A uJ device (3), for example, and this is detected. The rotational phase base 1$ signal (input to the r1 information processing device αQ, the setting signal from each knob U* (I* aηtr) of the operating device (8) (9), and the arithmetic processing in the information processing device 1 In addition to this, the rotation side w' of the mixer drum (2) is also performed.

FIG. 6 shows a block diagram of the control operation of the mixer drum drive control device including the complete gA.

The rotation of the mixer drum (2) is measured by a rotational speed sensor (6) and is input to the comparison section (c).

Furthermore, the operation switch (2) in the operator (8) of the author 2
In the operation of 70, after pasting (E), 1 work type identification @ is η and input into the comparison section (goods) and the display section).

These input signals to the comparator section (3) are subjected to JIR calculation and discrimination in the comparator section (c), and are then applied to the accelerator 11 of the engine (4).
(3) is used as the accelerator control output to control the accelerator actuator (31). Same.

Rotation speed control knob (2), slump value control knob θQ
, and for each operation of the rotation speed ratio control knob (17), one input is made to the comparison section (c) after the defeat (32) of seven.

The reverse discharge signal (33) and the rotation phase reference signal (34) from the rotation speed sensor a< are pasted (85) and then input to the comparison section (c) d h, the discharge of the bow reverse edible volume pump (6) Calculate the direction, oil content, and discharge timing of the pressure oil (86) L, and control the Pop Actuator Co., Ltd. as the lever control output (37).

Figure 7Gf) (b) ke is the operating device (8) or (9)
) shows an example of how to operate each control knob σQσI<17).

Figure 7 0) shows the case of discharging low slump concrete.

Rotate the rotation speed control knob (a) to the υF output side (drum reverse rotation)
If you set the tl ] tt position 1 as shown in the diagram,
The rotation speed standard of the drum is set in reverse rotation at lrpm.

Rotate the rotation speed ratio control knob Q as shown in the diagram.
When the mixer drum (2) is set at the L/position, the rotational speed changes every t times during one rotation of the mixer drum (2) such that the high rotational speed is set to four times the reference rotational speed (low speed rotation) (4 rpm).

In addition, this low-speed and high-speed rotation speed is longer than the dust mixer drum (
2) There are two changes in one rotation.

If you set the slump value control knob 0 [i to match the slump value of the fresh concrete to be handled and set it to Z15 part l/ as shown in j, the position where the mixer drum starts to rotate at low speed, or the position where the mixer drum starts to rotate at high speed is set. I can do it.

In other words, after a predetermined time period calculated in advance according to the slump value has elapsed after the rotation angle reference position of the mixer drum (2) is used by the one-rotation phase sensor α distortion, the mixer drum (2) is rotated at a low speed or a high speed. The mixer drum (2) moves at high speed during one rotation.

Repeat the change in low rotational speed twice.

Figure 7 (b) shows the case where fresh concrete with a high slump value is discharged.

Rotation speed control knob QIZ and rotation ratio control knob α force are the same as in the case of the above-mentioned figure 7), and only slump value control knob α is handled as shown in the figure to match the slump value of the fresh concrete. Cent to 22cmrl.

this? Therefore, the start position of the speed change during rotation of the mixer drum (2) corresponding to the high slump value p is temporally delayed compared to the case of the low slap value.

In both cases of high slump and low slump, the mixer drum (2) rotates at low speed in the angular phase where the discharge amount is large, and at high speed in the angular phase where the υF field amount is small.

FIG. 7(c) shows the case where fresh concrete is discharged little by little regardless of the slump value of the fresh concrete. Here, set the rotation speed ratio control knob (Jη to 21 motors as shown).
Set to l rt. Under the low rotational speed set by this (rising rotational speed control knob (g) 1), the rotational speed rotates at a constant speed without any change, and discharge is performed in a pulsating manner as in the past.

In this case, the setting of the slump value control dimension θ~ becomes irrelevant.

According to the present invention, when discharging ready-mixed concrete from the mixer drum of a mixer truck, the rotational speed of the drum is switched between high and low speeds at the optimum timing according to the slump value of the ready-mixed concrete with k rotational phase,
During the rotational phase period when the amount of discharge is small, the discharge of fresh concrete is prevented from pulsating due to the high speed so that it can be completed in a short time, reducing the total discharge time and improving work efficiency. and improve the operating efficiency of mixer trucks.

In addition, it is possible to arbitrarily change the discharge conditions of ready-mixed concrete from the minimum discharge amount (i) which is pulsating to the discharge M which is the highest efficiency, and has various effects such as making the handling and use of ready-mixed concrete convenient. It will be done.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the concrete mixer truck's cracked surface and the mixer drum drive device, Figure 2 is a related line diagram of the JJ control equipment system, Figure 8 is a partially cutaway side view of the mixer drum, and Figure 4 (A). (B)←U←) is a diagram showing the progress of the rotational position as seen from the rear opening of the mixer drum, and Figure 5 0) (B)←U indicates the discharge start time corresponding to the rotational phase of the mixer drum. The explanatory diagram, Figure 6, shows the mixer drum drive of the present invention! 1
Block diagram of J Post J Gosuke J's work, Figure 7 (a) (b)
t/e is an explanatory diagram of the operation steps of the operating device. (1)...Vehicle body, (2)...Mixer drum, (3)...
Drive device, (4)...engine/engine, (6)...power extraction device. (6)... Reversible variable displacement pump, (7)... Hydraulic motor (8) (9)... Operator, (IQ... Information processing device,
At q...control motor, (b)...rotation speed sender, (to)...accelerator drive device, a→...rotation phase sensor, (
G)...Rotation speed control knob, αS...Slump value control knob, aη...Rotation speed control knob, (+8A)
(18B)...Screw blade, Ql...Rear opening. (Roll)...Feed shoot, 171)...Extension shoot. (B)...Discharge port, wire...Intake %H...Comparison section, (C)
・・Operation switch, ・・Intake, @・・Work type identification, (c)・・Display part, @・・Acceleration amount calculation,
■...Accelerator control output, (31)...Accelerator actuator, (82)...Intake, (3B)...Reverse discharge signal, (34)...Rotation phase reference signal. (35)...Intake, (36)...Discharge timing calculation,
(87) ・Lever control device, (38) ・
・Pump actuator. Special ``Applicant's Agent Name: Patent Attorney Kaku 1) Yoshihiro

Claims (1)

[Claims] A mixer drum rotatably mounted on a vehicle body. The drive device for rotating the mixer drum in forward and reverse directions and the rotational phase of the mixer drum are examined, the rotational speed is changed approximately every rotation, and the rotational speed is changed in accordance with the slump value t of the ready-mixed concrete. season. and a control device for changing the rotational speed ratio.