JPS58112707A - Detector for revolution of 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 drum rotation detection device for a truck, which directly or indirectly detects the number of rotations of the drum by extracting the number of rotations from any rotating part.

The front part of the drum 6 is supported by a bearing 4, and the rear part is supported by a guide roller 5 and a drum band (not shown). good). Reference numeral 6 denotes a plunger motor for the drum body, which is fixed to the tabletop 2, connected to an appropriate hydraulic system W (not shown) such as a hydraulic pump, and connected to the drum 3 via a sprocket, ) 7.8 and a chain 9. Transmit driving force. 10 is a proximity sensor (detector) mounted on the upper part of the plunger motor 6, and its tip is inserted into the inside of the plunger motor 6, and is close to the one in the extended state above among the plungers 11 disposed in an annular shape. I am facing this.

Next, to explain the operation of this embodiment, when the plunger motor 6 is driven by a hydraulic bag # (not shown) in order to rotationally drive the drum 3, each plunger 11 rotates while extending and contracting. When the plunger is in an extended state and approaches the proximity sensor 10, as the rotation continues, the next plunger approaches the proximity sensor 10, and the same action is repeated in sequence. Therefore, in the proximity sensor 10, each plunger 1
Since a detection action is performed every time a drum 1 approaches, this detection period is detected by converting it into the number of rotations of the feed drum using an electric signal such as a pulse to an appropriate electric control device.

FIG. 4 shows a drum drive chain 9 in a second embodiment of the present invention.
A detector 12 such as a proximity sensor or a phototube (in the case of a proximity sensor, only one is required) is placed in front of the vehicle chassis 21.
Attach it to 1. During detection, the passage of the reeler 13 is detected by the detector 12 as the chain 9 wound between the sprocket, the door and the chain 8 operates, and the detection period and the pitch of the rollers 13 of the chain 9 are determined. 5 and 6 show a third embodiment of the present invention, the drum 6 is
In the circumferential direction of the bearing 4 in front of the front wall of the drum shaft tube
1. The object to be detected 15 is protruded from the circumference of a circle with a constant radius of curvature using support stays (not shown) or the like at spacing intervals, and a detector is installed on the vehicle body 2 at a position close to the object to be detected 15. As shown in FIG. 6, the object to be detected is formed in the shape of a circular arc with a constant radius of curvature R, as shown in FIG. The distance is maintained constant even when the proximity switch 16 is oscillated at the oscillation angle B, and erroneous operation of the proximity switch 16 can be prevented.

The proximity switch 16 detects when the detected object 15 approaches and when it does not approach, and detects the drum rotation speed in the same manner as in the previous embodiment.

FIGS. 7 and 8 show fourth and fifth embodiments of the present invention. First, in the fourth embodiment, objects to be detected, such as reflective materials, are arranged radially near the outer periphery of the front wall of the drum 3 at appropriate intervals. 17 is installed,
Facing the detected object 17, a detector 18 such as a phototube or a proximity switch is mounted on the chassis 2II! Further, in the fifth embodiment, detecting objects 19 such as reflective materials are mounted radially at appropriate intervals on a rotary plate 18 mounted on a drum shaft 14, while A detector 20 such as a phototube or a proximity switch is mounted on the vehicle chassis 2. The detection procedures of the fourth and fifth embodiments are the same as those of the previous embodiments.

Also, the proximity switch as a detector in the first embodiment.

As another embodiment of H 10, a vibration detection sensor may be used to detect the vibration noise caused by the sliding movement of the plunger 11 when the plunger 11 is extended or retracted.

Furthermore, as a rotation detection means, it is of course possible to detect rotating parts other than those in the above-mentioned embodiments, such as the rear part of the drum, the guide roller 5, the gears and shafts of the reducer, and the hydraulic pulsation of the motor during plunge.

As described above, according to the present invention, since the rotation speed detecting means is provided in the drum rotatably mounted on the chassis or in the drive system of the drum, the rotation speed of the drum can be detected accurately and simply. Improves work efficiency when using electrical control.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of the mixer truck, and Fig. 2 is the first embodiment of the present invention.
FIG. 6 is a perspective view showing the embodiment; FIG. 6 is a partially cutaway side view of the main part thereof; FIG. 4 is a front view showing the second embodiment; FIG. 5 is a front view showing the third embodiment; FIG. 7 is a front view showing the fourth and fifth embodiments, and FIG. 8 is a side view thereof. 2... Chassis, 3... Drum, 10.12016.1
8・20...Detector, 15-・17・19...Detected object Figure 2 Figure l Figure 5 Figures 2f to 7 Figure 8 Procedural amendment 1. Display of the case Mixer truck drum rotation detection device 3, person making the amendmentRelationship with the case Patent applicant 4, multiple agent 6, contents of the amendment As shown in the attached sheet (1) ``18'' in the first line of page 5 of the specification " is corrected to "21". (2) Correct the number 18 in Figure 8 of the cylinder in the attached drawing to 21 as per the arrangement.

Claims (1)

[Scope of Claims] 0) A drum rotation detection device for a mixer truck, comprising a drum rotatably mounted on a chassis or a rotation speed detection means in the drive system of the drum. ■The rotational speed detecting means comprises a detection object mounted radially outside the drum, and a detector mounted on the chassis facing the detection object. Rotation detection device. ■The rotation speed detection means is a drum rotation detection device for a mixer truck as set forth in claim 1, which comprises a detector mounted on a plunger motor for driving the ram so as to face the internal plunger. Claim #! Item 1: A drum rotation detection device for a mixer truck by Kiyabe, which comprises a detector fixed to the chassis in close proximity to a drive chain.