JPH0361504A - Apparatus for detecting drum rotation of mixer truck - 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 (Field of Industrial Application) The present invention relates to a drum rotation detection device for a mixer ili, which takes out the 111 rotation number from the drum drive system and indirectly detects the drum rotation number.

(Prior technology) A cam is installed on the drum shaft to detect the rotation speed of the drum of mixer 1, and a contact type detector such as a limit switch is installed on the side of the jli stand to detect the cam and the rotation speed of the drum. This is detected by mechanical contact with the limit switch.
(There is one that calculates 11 rolls.

(Problems to be Solved by the Invention) Since the above device always involves mechanical contact, there is a problem in durability, and there is also a concern that poor contact may occur due to wear and repeated contact. There is also.

(Means for Solving the Problem) The present invention solves the problem No. 11.
The rotation speed detection means is a mixer weight drum rotation detection device consisting of a detector mounted on a drum driving plunger motor close to the internal plunger.

(Embodiment) Below, an embodiment of the present invention will be described with reference to the drawings. 1 is a mixer east, and a drum 3 is mounted on 1 polymerization 2. The drum 3 has a bearing 4 at the front and a guide roller 5 and a drum at the rear. band(
(not shown) (the +iii portion may be directly connected to and supported by the hydraulic motor instead of the bearing 4). Reference numeral 6 denotes a plunger motor for driving the drum, which is fixed to the li stand 2, connected to the oil 1-E device (not shown) of the ura pressure pump, etc. transmits driving force to. 10 is a proximity sensor (
(detector) is installed in the L section of the plunger motor 6.

The tip end thereof is inserted into the interior of the plunger motor 6 and faces close to the plunger 11 which is in the extended state on the -E side of the annularly arranged plungers 11.

Next, to explain the operation of the present invention, when the plunger motor 6 is driven by an oil IE device (not shown) to rotate the drum 3, each plunger 1! The plunger rotates while expanding and contracting, but when it moves upward, it becomes extended and approaches the proximity sensor 10. As the rotation continues, the next plunger approaches the proximity sensor, and the same action is repeated in sequence. . Therefore, since the proximity sensor IO performs a detection action each time each plunger 11 approaches, the detection period is detected by converting the detection period into the feed drum rotation speed using an electric signal such as a pulse to an appropriate electric control device.

(Effects of the Invention) As described in Part 2, according to the present invention, a detector is provided in the plunger motor for driving the drum mounted on the rotary motor 7E on the upper stand, and is placed close to the plunger, so that the detector is not exposed to the external environment. 1 [Reliably and simply drum 1-! 1
The number of rotations can be detected.

[Brief explanation of drawings]

Figure 1 is an overall side view of Mixa City, Figure 2 is a perspective view, and Figure 3 is a side view of the mixer city.
The figure is a partially cutaway side view of the main part. 2...S(stand, 3...drum, 10...detector,
+1...Plunger.

Claims (1)

[Claims] A rotation speed detection means is provided in the drive system of the drum rotatably mounted on the chassis, and the rotation speed detection means consists of a detector mounted on the drum drive plunger motor in close proximity to the internal plunger. Mixer truck drum rotation detection device.