CN204263601U - Punching machine angular display unit - Google Patents

Abstract

The utility model relates to a mechanical press angle display, which belongs to the technical field of press detection and is an improvement on the existing electronic angle display structure. The main feature is that the signal interface is connected to an angle sensor with a linear Hall device as a signal acquisition element The angle sensor signal is connected to the single-chip microcomputer, and the crankshaft of the mechanical press drives the mechanical rotation shaft in the angle sensor to rotate. The linear Hall element senses the change of the magnetic field of the permanent magnet magnetic ring, and the linear Hall element outputs an analog voltage signal through the output interface. Connect to the angle sensor signal interface of the angle display through a cable. The single-chip microcomputer samples the signal input by the angle sensor, calculates and looks up the table to obtain the angle digital signal, and displays the real-time angle value through the display circuit. The utility model adopts a linear Hall device as a signal acquisition element, and the Hall device induces a magnetic field change in a non-contact manner, and the output analog voltage value corresponds to the absolute position angle of the crankshaft. At the same time, the oil, dust and other environments have no influence on it, and the shock resistance is good. .

Description

Mechanical Press Angle Display

technical field

The utility model relates to a mechanical press angle display (commonly known as a marquee), which displays the angle value corresponding to the crankshaft position of the press, and belongs to the technical field of press detection.

Background technique

At present, the angle indication devices commonly used in mechanical presses include mechanical pointer dials and electronic angle displays (commonly known as marquees). The mechanical pointer dial is installed on the top of the crankshaft of the mechanical press to indicate the rotation position of the crankshaft, but it is sometimes inconvenient to observe due to the limitation of the installation position of the crankshaft. The electronic angle display is mainly composed of an input interface circuit, a display circuit, an angle sensor, a single-chip microcomputer and a power supply circuit. The crankshaft of the mechanical press is connected with an angle sensor, and the single-chip microcomputer decodes the angle digital signal, and the display circuit displays the angle value to indicate the position of the crankshaft and provides the setting parameters of the man-machine interface. The angle sensor commonly used in the current electronic angle display is a photoelectric incremental encoder.

The electronic angle display adopts the photoelectric incremental encoder as the angle sensor, and its photoelectric incremental encoder outputs three incremental encoding signals of A, B, and Z, and the angle decoding circuit calculates the input signals of A, B, and Z through the counting circuit. Output the crankshaft position angle value of the mechanical press. Electronic angle displays using photoelectric encoders as angle sensors have the following problems: (1) poor dustproof performance. Due to the harsh environment of the industrial site and a lot of dust, and because the rotating parts of the code disc of the photoelectric incremental encoder are difficult to seal, once there is dust on the photoelectric device inside the photoelectric incremental encoder and the circular code disc, the light detected by the light receiving device will be damaged. The signal will be wrong, even the light signal cannot be detected, the output voltage pulse signal is wrong or there is no signal output, resulting in the detected angle value not corresponding to the crankshaft position of the press. (2) The incremental encoder obtains the angle by counting, and its output is not the absolute position angle. The incremental encoder is powered on again after power-off, and the pulse count value of incremental encoder output A and B is saved by power-off to realize the detection of the crankshaft position of the press corresponding to the initial angle after power-on. If the value saved after power-off is wrong or If the mechanical shaft of the incremental encoder rotates after power-off, there will be an error between the angle detected for the first time after power-on and the absolute position of the crankshaft of the press. (3) Due to the large vibration when the press is working and the poor anti-seismic performance of the incremental encoder, the reliability is reduced and the service life is reduced.

Utility model content

The utility model provides an angle display for a mechanical press, aiming at the problems that the electronic angle display currently installed on the mechanical press uses a photoelectric incremental encoder as an angle sensor and has poor shock resistance and dustproof performance, and the absolute angle does not correspond to the position of the crankshaft. The utility model realizes dust-proof and shock-proof, corresponds to the absolute position of the crankshaft, and improves the reliability of the electronic angle display.

The utility model is realized through the following technical solutions. A mechanical press angle display includes a housing, an angle sensor signal interface on the housing, an input interface circuit, a display circuit, a single-chip microcomputer and a power supply circuit in the housing, and is characterized in that The signal interface of the angle sensor is connected to an angle sensor with a linear Hall device as a signal acquisition element, and the signal of the angle sensor is connected to a single-chip microcomputer.

The angle sensor includes a housing, a rotating shaft, a printed circuit board, a linear Hall element, an output interface circuit and a permanent magnet magnetic ring; the rotating shaft is covered with a permanent magnet magnetic ring, and a linear Hall element is installed on the printed circuit board And the output interface circuit, the linear Hall element is opposite to the surface of the permanent magnet magnetic ring and connected to the output interface circuit, and the output interface circuit is a general voltage follower.

No less than two linear Hall elements are fixed on the printed circuit board.

The permanent magnet magnetic ring sheathed on the mechanical rotating shaft is a radial magnetic ring of a pair of magnetic poles.

The single-chip microcomputer adopts Atmegaxxx or C8051Fxx or STCxx.

The utility model is an improvement on the structure of the existing electronic angle display. The permanent magnet magnetic ring is fixed on the internal mechanical rotating shaft of the angle sensor, and the linear Hall element is fixed on the printed circuit board. When the crankshaft of the mechanical press drives the mechanical rotating shaft in the angle sensor to rotate, the linear Hall element senses the change of the magnetic field of the permanent magnet magnetic ring, and the linear Hall element outputs an analog voltage signal, which is output through the output interface and connected to the angle display through a cable Angle sensor signal interface. The single-chip microcomputer samples the signal input by the angle sensor, calculates and looks up the table to obtain the angle digital signal, and displays the real-time angle value through the display circuit. The utility model adopts a linear Hall device as a signal acquisition element, and the Hall device induces a magnetic field change in a non-contact manner, and the output analog voltage value corresponds to the absolute position angle of the crankshaft, and at the same time, the oil, dust and other environments have no influence on it, and the shock resistance is good. .

Description of drawings

Fig. 1 is a block diagram of the utility model;

Figure 2 is a schematic block diagram of the angle sensor in the utility model;

Figure 3 is a schematic diagram of the mechanical structure of the angle sensor in the utility model.

Detailed ways

Further illustrate the utility model in conjunction with accompanying drawing and embodiment, as shown in Figure 1, the utility model provides DC voltage by power supply module, supplies power to input interface circuit, display circuit, angle sensor, single-chip microcomputer. The angle sensor outputs a voltage signal corresponding to the position of the rotating shaft. The single-chip microcomputer samples the analog voltage signal, looks up the table or calculates the angle digital signal of the crankshaft position of the press, controls the display circuit to display the angle value and related parameters, and scans the display circuit. Press the button to realize the parameter setting function. As shown in Figure 2, the internal circuit of the angle sensor is composed of a linear Hall element and an output interface circuit. The linear Hall element induces the magnetic field of the permanent magnet magnetic ring to generate a voltage signal, which is output through the output interface. As shown in Figure 3, the rotating shaft 2 of the angle sensor and the printed circuit board 4 fixing the linear Hall element 5 are installed on the support 1, and the linear Hall element 5 is vertically fixed on the printed circuit board 4 close to the magnetic ring of the permanent magnet 3, the permanent magnet magnetic ring 3 is sleeved on the mechanical rotating shaft 2. The linear Hall element 5 is opposite to the surface of the permanent magnet magnetic ring 3 and separated by a certain angle. The upper 3 digital tubes of the housing of the utility model display the angle value, the lower 6 digital tubes display the production count value (the number of turns of the crankshaft rotation), and the LEDs corresponding to the angle positions of a circle marquee are on.

The angle display of the utility model adopts an angle sensor with a linear Hall device as a signal acquisition element, and a single-chip microcomputer samples the signal input by the angle sensor, looks up a table or calculates an angle digital signal, and displays the crankshaft position angle of a mechanical press. The utility model solves the problem that the angle display using the photoelectric incremental encoder as the angle sensor has poor dustproof and shockproof performance, and the angle does not correspond to the absolute position.

Claims (5)

1. a punching machine angular display unit, comprise housing, angular transducer signaling interface on housing, input interface circuit in housing, display circuit, single-chip microcomputer and power circuit, it is characterized in that, described angular transducer signaling interface access take linear hall-effect device as the angular transducer of signal collecting element, angular transducer signal access single-chip microcomputer.

2. punching machine angular display unit according to claim 1, is characterized in that, described angular transducer comprises housing, turning cylinder, printed circuit board, linear hall element, output interface circuit and permanent magnet magnetic ring; On turning cylinder, the solid permanent magnet magnetic ring of cover, printed circuit board is installed linear hall element and output interface circuit, and linear hall element is relative with permanent magnet magnetic ring surface and be connected with output interface circuit, and output interface circuit is common voltage follower.

3. punching machine angular display unit according to claim 2, is characterized in that, described printed circuit board is fixedly no less than two linear hall elements.

4. punching machine angular display unit according to claim 2, is characterized in that, described mechanical rotation axle overlaps the radial magnetic ring that solid permanent magnet magnetic ring is a pair magnetic pole.

5. punching machine angular display unit according to claim 1, is characterized in that, described single-chip microcomputer adopts Atmegaxxx or C8051Fxx or STCxx.