SU58311A1 - Device for automatic control of the machine - Google Patents

Description

The device according to the invention is intended to automatically control lathe and grinding type machines by coordinating the work of the machine actuators with the result of measuring the diameter of the workpiece during its processing.

In the proposed device, the probes already in use and used in other machines for automatic control of the product are used, which are used to measure the product.

The essence of the invention is that the measuring probes are made only periodically in contact with the product, fixed on the moving cores of the electromagnets and connected to the moving parts of capacitive or inductive sensors included in the measuring circuit, which acts on the electromagnets that automatically install moved the probes away from the product to the position corresponding to that which takes place during mechanical contact with the product in order to subsequently measure the product by the distance m Between the probes and the corresponding effect on the flow.

The device described in this author's certificate is intended to measure the dimensions of the parts that undergo extensive liquid cooling during processing.

In the drawing of FIG. 1, a side view of the frame carrying the measuring probes is shown in the drawing, FIG. 2 is one of the variants of the design design of the measuring head, FIG. 3 - electrical circuit of the device.

The device consists of a frame L (Fig. 1), having a reciprocating motion in the guides with stops at the extreme positions; the frame makes two or three moves per second.

In the left extreme position, the tips of the N measuring probes (heads) are pulled over the measured part. The measuring probes, equipped with springs, are moved apart and, at the time of measurement (the leftmost position of the frame), the distance between them is fixed by capacitive, inductive or similar measuring instruments, the moving parts of which are connected to the measuring tips. Then the frame L begins to move backwards, the measuring tips descend from the part, but now the E71 micro-magnets embedded inside the measuring heads tighten the measuring tips so that each of them with great precision (.5i) is in the same pollenia ;, in which it was at the time of measurement, recorded by electrical meters. Under these conditions, the distance between the measuring tips is obtained with great accuracy equal to the size of the part diameter. When the frame L goes to the right end position, this distance between the tips is measured (at the time of stopping). Screws M are adjusted by hand when setting up the device so that the reference size corresponds to zero on the scale of the measuring device. They begin to rotate if the diameter of the part falls outside the scale of the measuring device Q. This measuring device can be anything. R brushes clean tips from adhering particles. Thus, in the proposed device, the influence of dust, dirt, etc., is reduced due to the cleaning action of the approaching tips, the abrasion of the measuring tips N is eliminated and, therefore, the possibility of long-term automatic operation of the device without adjustment is possible.

One of the possible structures of the measuring head is shown in FIG. 2. Here yVj is a measuring tip, is a capacitor plate connected to it (grounded), D is a movable cup associated with a measuring tip, E is a spring acting on the cup, H is an armored cable connected to a fixed plate C { capacitor meter, / -expanded head of the core of the electromagnet, coupled with the glass and supporting it when the tip yVj comes off the measured part, Z- winding of the electromagnet.

The electrical circuit of the device (Fig. 3) contains a generator Gj of increased frequency, supplying a bridge consisting of a capacitance C (plates C and C2. In Fig. 2) located in the measuring head, a constant capacitance C and resistance R. In the diagonal of the bridge G2 is turned on inductively coupled to the phased cascade.

Thus, at terminals L and 5, at the time of the primary change, there will be a constant voltage corresponding to the magnitude and sign of the departure of plate C of capacitance C from some average normal position. At the moment when the frame / is in the left extreme position (Fig. 1), terminals A VL B are connected to terminals A and B (Fig. 3) of the input circuit of the compensation lamp voltmeter Od, and the capacitor C is charged before the voltage which is present on terminals A vi B. Then, when frame L moves to the right, terminals A i B are disconnected from terminals L and j5j, and another connection is made during the whole time of departure, namely, terminal A is connected to. B c C s c. If now the actual position of capacitance Cj is such that the voltage UAB is not equal to the voltage at the output resistance ffa of the lamp voltmeter Gg (the amplification factor of the voltmeter Gg is equal to one), then the capacitance Cj does not correspond to its previous position. Then, between the terminals AZ and Bi, a voltage difference is formed, which, after passing through the amplifier G, acts on the thyratron T and ignites it. An electromagnet Z is connected to the anode circuit of the thyratron (Fig. 2), which pushes the measuring tip, and with it the movable plate C of the capacitance Cj until the moment of equilibrium. The whole scheme can be made sensitive to the deviation of the plate from its normal position by a value of the order of - + - 0.5 fj. The capacity of the Cr does not have time for 0.3-0.5 seconds noticeably discharge as it can be chosen equal to I-6 P.F. As a result, at all times

frame L moves backward, as well as during the secondary measurement in the extreme right position, each of the measuring tips (in Fig. 3, for simplicity, a diagram is shown for only one of the tips, for the other, the diagram is identical) is in the same position as it was fixed at the time of measurement. In the extreme right position, the distance between the tips is measured by some measuring system and the counting is carried out on the scale of the corresponding device C, and the control device of the executive body can be associated with this system. To do this, at the time of the measurement, terminals X V. Y (Fig. 3) must be connected in the circuit of the secondary measurement circuit.

The devices are switched on automatically using end contacts 1, 2.3 and 4 located on the frame guides L (Fig. 1) on the path of its movement.

The subject matter of the invention.

Claims (3)

1. Device for automatic control of turning, grinding or the like with the use of probes in contact with the product to measure the dimensions of the product, characterized in that the probes, only periodically in contact with the product to carry out the measurement, are attached to the moving cores of electromagnets and connected to the moving parts of capacitive or inductive sensors included in the measuring a circuit serving to act on said electromagnets, automatically setting the probes away from the product to the position corresponding to that which occurred during mechanical oprikosnovenii with the product for subsequent measurement of an article according to the distance between the probes and the corresponding effect on the flow. 2. In the device according to claim 1, use an automatic drive for the probes to periodically briefly push them onto the product. 3. In the device according to claims. 1 and 2 apply end contacts in the path of the frame carrying the probes to automatically switch the measuring circuit and turn on the electromagnets. with 00 ipp f in f h: nn n " about and about Rch he VD NW Ss five: