RU206791U1 - Device for weight control of parts - Google Patents

Abstract

The proposed device for weight control relates to the field of mechanical engineering and, in particular, to devices for weight control of parts such as blanks for piston pins of automobile engines. It consists of a base, a first prism fixed on the base, a two-armed rocker arm mounted on the first prism, an electromagnetic damper connected to the first rocker arm, and a second prism fixed on the upper surface of the second rocker arm. Its distinctive features are that it is equipped with two vertically located autogenerating sensors located on the base parallel to each other and perpendicular to the lower surface of the second arm of the rocker arm with a gap between this surface and the active surfaces of the sensors. In this case, the sensors are installed with the ability to move in the direction of the rocker arm and in a direction parallel to the lower surface of its second arm, and the latter is made of two halves, one of which is made of ferromagnet, and the other is diamagnet. The device has a higher accuracy reliability than the prototype. and does not require complex electronic devices for perceiving information. This creates a technical result consisting in increasing its technological reliability.

Description

The proposed utility model relates to the field of mechanical engineering and, in particular, to devices for weight control of cylindrical parts such as blanks for piston pins of automobile engines.

Currently, devices for a similar purpose are known. These include, for example, "Device for sorting parts by weight", protected by the USSR author's certificate No. 1378936 (1988, Bul. No. 9), developed by A.S. Shcherboy, V.S. Kapitonov and others.

This device contains a rectangular frame capable of reciprocating movement. Two diamond-shaped rollers are installed across the frame, the centers of gravity of which are located below their axes of rotation. L-shaped brackets with stops are placed on the base of the device, and so that the latter have the ability to interact with the upper ribs of the rollers when the frame is relative to the base in extreme positions. When the frame is in the middle position, the part to be inspected is placed between the rollers. If its mass (weight) is greater than a certain boundary value, then the rollers turn and the part falls down between them, heading into the "usable" compartment. If the part has a mass less than the limit value, then the rollers do not rotate, the frame is moved in one direction or the other, one of the rollers interacts with one of the stops and the part falls down into one of the compartments located under the stops, which means that they " unusable ".

The considered device does not contain complex electronic elements, since the drive for the reciprocating movement of the frame is quite simple (the elements of the power supply of the engine and the crank mechanism). However, it has significant drawbacks: the first of them is the control of parts on the basis of "more or less", which is not always enough. When, for example, weight control of parts such as blanks of piston pins is required, then they must be controlled according to the signs of "reject", "good", "reject" - "". "Scrap" - "" is processed for another standard size of workpieces or for remelting, "scrap" + "" - for lathe machining, "good" ones are fed to cold heading machines to obtain piston pins in rough form (then they are polished and obtained in a finished form). In addition, even control on the basis of "more-less" device according to copyright certificate No. 1378936 provides very inaccurately. The rotation of the rollers depends on the friction in their bearings, but it is very variable due to possible contamination, untimely lubrication, lubrication temperature, etc.

The noted disadvantages are largely devoid of the device for weight control of parts described in the book by Ya.L. Lieberman and V.V. Kuvshinsky “Control and sorting machines. - M .: Mechanical Engineering, 1983 "on pp. 80-81 (Fig. 80, b). The specified device, taken by us as a prototype, consists of a rocker balance (rocker arm mounted on a prism), which are equipped with an electromagnetic damper to increase the performance of the device (with its help, the rocker arm is also fixed at the time of loading the controlled part on the scales). The damper is connected to one rocker arm. On the other arm of the rocker arm, on its upper surface, one more prism is installed - for basing the controlled part. On the lower surface of the same rocker arm there is a support element (plate) of the pneumatic probe, which measures the rocker arm displacement from the initial position. The pneumatic probe transmits a signal to the pneumatic electrocontact sensor, then to the electronic circuit of the device, built on two threshold subcircuits, and then to the actuating electromagnets. The latter can already send the inspected part to the corresponding compartment of the device ("defective" + "", "good", "defective" - "").

The prototype device is much more accurate than the analogue according to copyright certificate No. 1378936, but it has its own drawbacks. The main one is not always a sufficiently high technological reliability (see the book by Ya.L. Lieberman "Increasing the technological reliability of control and sorting machines. - Sverdlovsk: Ural State University Publishing House, 1990"), which is expressed in precision failures of the device caused by the inconstancy of the contact force a pneumatic probe with a base plate, and hardware failures of a pneumo-electric contact converter and a complex electronic circuit.

The problem solved by the proposed utility model is to increase the technological reliability of the prototype device.

The technically formulated problem is solved due to the fact that a device for weight control and sorting of parts, consisting of a base, a first prism fixed on the base, a two-armed rocker mounted on the first prism, an electromagnetic damper connected to the first rocker arm, and a second prism fixed on the upper surface of the second arm of the rocker arm, differs from the prototype in that it is equipped with two vertically located autogenerator sensors located on the base parallel to each other and perpendicular to the lower surface of the second arm of the rocker arm with a gap between this surface and the active surfaces of the sensors, while the sensors are installed with the possibility movement in the direction of the rocker arm and in a direction parallel to the lower surface of its second arm, and the latter is made of two halves, one of which consists of a ferromagnet, and the other of a diamagnet.

FIG. 1 shows a longitudinal section of the proposed device (in the plane A-A); in fig. 2 - cross section (in plane BB).

The device consists of a base 1, a first prism 2, fixed on the base, a two-armed rocker arm 3 mounted on the first prism, an electromagnetic damper 4 connected to the first arm 5 of the rocker arm 3, and a second prism 6, fixed on the upper surface of the second arm 7 of the rocker arm 3. It is equipped with two vertically arranged autogenerating sensors of the BES type 8 and 9, placed on the base 1 parallel to each other and perpendicular to the lower surface 10 of the second arm 7 of the rocker arm 3 with a gap between this surface and the active surfaces of sensors 8 and 9. Sensors 8 and 9 are installed with the possibility movement in the direction of the rocker arm 3 and in a direction parallel to the lower surface 10 of its second arm 7. The latter is made of two halves 11 and 12, the first of which is made of ferromagnet, and the second is made of diamagnet (glued).

To implement the possibility of movement, the sensors 8 and 9 are equipped with nuts 13 and 14, 15 and 16, screwed onto their bodies, and bolts 17 and 18, abutting against them perpendicular to their axes. At the base 1, oval holes are made to accommodate the sensors, in which the sensors are located.

Before practical use of the device, it must be configured. For this, the features of the operation of autogenerating sensors of the BES type are used (see the book "Ya.L. Lieberman. Monitoring systems for metal-cutting machines. Yekaterinburg: USTU, 2000", p. 12, Fig. 4, b). These features are that when the flat screen interacts with the active surface of the sensor (page 10, Fig. 3 in the specified book), the sensor is triggered (issues a relay signal) at a certain gap between the screen and the sensor (Y) and a certain overlap of the active surface of the sensor screen (X). In this case, the response also depends on what material the screen is made of. So, if the screen is ferromagnetic (in particular, steel), then when the active surface of the sensor is completely covered by the screen, it is triggered with a gap of 4.5 mm. As the overlap decreases, the trigger gap decreases. If the screen is diamagnetic (in particular, duralumin), then the sensor is triggered, for example, when its active surface is overlapped by about 60%, with a gap of 2.0 mm. As the overlap decreases, the gap also decreases.

In connection with the above, the device is configured as follows.

A reference part is taken, having a mass corresponding to its lower permissible limit, and placed on the prism 6. Then, using the nuts 13 and 14 and the bolt 17, the sensor 8 is moved relative to the element 11 of the device to the position at which it is triggered. After that, take a reference part having a mass corresponding to its upper permissible limit and place it on the prism 6 instead of the previous part. Next, using the nuts 15 and 16 and the bolt 18, the sensor 9 is moved relative to the element 12 of the device to the position at which this sensor is triggered.

After completing the configuration, the device can already be used. For this, the parts to be inspected are sequentially installed one after the other on the prism 6. After installing each part, after the time required to stop the oscillations of the rocker arm 3, the sensors 8 and 9 are interrogated. If it turns out that none of the sensors has triggered, then the part can be further directed to the "reject" section. If sensor 8 is triggered, but sensor 9 is not triggered, then the part can then be sent to the "good" compartment. If both sensors 8 and 9 are triggered, then the part should be directed to the section "reject" + "".

The proposed device does not require a complex electronic circuit, a pneumatic electrocontact converter and a pneumatic probe interacting with the rocker arm of the device by a contact method. This increases the accuracy of the control and, when used, increases the instrumental reliability.

Ultimately, the proposed utility model creates a technical result, expressed in an increase in the technological reliability of the control device.

Claims (1)

A device for weight control and sorting of parts, consisting of a base, a first prism fixed on the base, a two-armed rocker arm mounted on the first prism, an electromagnetic damper connected to the first rocker arm, and a second prism fixed on the upper surface of the second rocker arm, differing in that that it is equipped with two vertically located autogenerator sensors located on the base parallel to each other and perpendicular to the lower surface of the second arm of the rocker arm with a gap between this surface and the active surfaces of the sensors, while the sensors are installed with the ability to move in the direction of the rocker arm and in a direction parallel to the lower surface its second arm, and the last is made of two halves, one of which is made of ferromagnet, and the other is diamagnet.

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