RU2670732C1 - Automatic dimensional sorting details - Google Patents

Abstract

FIELD: machine building.SUBSTANCE: invention relates to control and sorting engineering in mechanical engineering and is intended for automating control in dimensional sorting of miniature asymmetrical cylindrical details, for example pins of radio connectors, in large-scale and mass production. Tasks of simultaneous control of diametrical size and form error of working part of radio connectors pins, as well as reliable fixation of monitored part in clamping device (cartridge) with predetermined amount of detail emission during measurement. Goal is achieved by the fact that before entering part from handler into clamping chuck, by means of pneumatic cylinder, clamp is placed in a way that limits the amount of detail's outreach. Another pneumatic cylinder, acting on pusher, ensures opening of jaws in chuck, thereby freeing the space inside chuck for detail to traverse. On command from control unit, pneumatic cylinder moves away from pusher and, under action of return spring, pusher returns to its original state, and clamping jaw chucks are closed, ensuring reliable fixing of the detail. After detail clamping, latch returns to its original state and transport device moves to control position, where cartridge is fed to cartridge with stepping motor of cartridge rotation. Dimension sensor is fed to detail and, using locking device, dipsticks are lowered onto detail to be monitored at chuck output. During measurement, detail rotates together with chuck, and carriage with size control sensor makes linear movement, so measurement result is obtained spirally. Practical implementation of device is performed in control unit KI1502, developed jointly by Tolyatti State University and OJSC "Electro-connector".EFFECT: as a result, by the end of measurement, diametric size control is performed over entire detail working length with estimation of form error.4 cl, 3 dwg

Description

The invention relates to a control and sorting technique in machine-building instrument making and can be used to sort miniature cylindrical parts, such as pins for radio connectors.

A machine for monitoring and sorting cylindrical parts (needle rollers) of model 45301 is known (BM Sorochkin, “Automation of Measurement and Control of Part Size”, L., Mashinostroenie, Leningrad Branch, 1990, p. 316). The machine contains a boot device with a drive, a transporting device, a measuring unit, a storage device and a control panel.

The main disadvantage of the design is the impossibility of organizing the control of the geometric parameters of asymmetrical miniature parts.

As an example of control of asymmetric parts can serve as a control machine according to a.s. 1037972 (Bull. No. 32 of 08/30/1983). The machine serves to control the quality of the sockets of plug connectors and contains a boot device, a transport device, a control device with sensors and a control unit.

A distinctive feature of the machine is that the quality control of the manufacturing of the socket, including its geometrical parameters, is carried out according to an indirect parameter - the force of unclamping the socket, performed in the control cycle.

For this purpose, a special procedure for measuring the unclamping force of the socket with the help of reference pins is organized. Thus, it is possible to carry out quality control of manufacturing asymmetric parts, which is the socket of the plug connector.

The analysis of the presented solutions, as well as the designs of other automata for the control of cylindrical parts, allows to note the following points:

1. The control of the diametrical dimensions of parts such as miniature unbalanced pins of radio connectors, performed in automatic mode, is practically absent.

An operation close in meaning is to control the quality of the jacks of sockets, which is performed automatically, but indirectly by means of a release force control, as is the case in A. 1037972.

2. The control of the diametrical dimensions of conventional symmetrical cylindrical parts, such as needle rollers, is carried out in control automata mainly in one section, which is the cause of incorrectly received or incorrectly rejected products.

3. With increased demands on the quality of the product, in addition to controlling the diameter over the entire working length, control of the shape error, primarily ovality and cylindricity, is required.

Tasks of this kind are solved either with the help of rigid calibers used in the control cycle (A. p. 1148656), or by introducing special tools that detect shape error (p. 99306, and. p. 465768).

These circumstances determine the use in the practice of monitoring the pins of radio connectors of the simplest calibers based on the use of a lever bracket, for example, the 523 series from MITUTOYO (Japan). In this case, the controlled part is placed between two flat jaws of the bracket, the pin is rotated manually around its axis. At the same time with the control of the diameter, the shape error — ovality and cylindricity — is approximately estimated.

Manual control performed on the lever brackets, accompanied by subjective errors and can not be considered effective.

The main difficulty in organizing automatic control lies in the asymmetry of the part, as is the case with the pin of an electrical connector consisting of two cylinders, a relatively long working part and a short shank. All control operations on a part can be performed if the part is reliably based in a clamping device, with which all necessary control operations are then performed.

For this purpose, an automatic machine is proposed for dimensional sorting of cylindrical asymmetrical parts, for example, pins of radio engineering connectors. The machine contains a vibrating hopper with an orienting device, a hopper, a transporting device with a rotating electric motor, a sensor for monitoring dimensions and a control unit connected to the measuring unit, receiving devices for suitable and defective parts. Two chucks, mounted on a transporting device and equipped with recharging mechanisms and driving gears, and a locking device mechanically connected with the measuring probes of the part size control sensor and connected to the control unit are inserted into the machine. In addition, two linear displacement carriages, two stepper motors, three pneumatic cylinders, and a retainer for the part being monitored are inserted into the machine. The first carriage with the dimensions control sensor installed on it and the arresting device reciprocates from the first stepper motor connected to it kinematically connected to the control unit. The second carriage with the second stepper motor mounted on it reciprocates from the first pneumatic cylinder kinematically connected with it. The clamp of the controlled products has a tapered groove and reciprocates from the second pneumatic cylinder, which is kinematically connected with it. The second stepping motor includes a drive gear that alternately engages with the drive gears of the clamping chucks.

The reloading mechanism contains a spring return piston, the working end of which is kinematically connected to the clamping chuck, and the second end is kinematically connected to the third pneumatic cylinder connected to the control unit. FIG. 1 shows a block diagram of a machine for testing cylindrical asymmetrical parts. FIG. 2 - clamping cartridge with a recharge mechanism in the section. FIG. 3 shows the appearance of the control automaton of the model KI1502 of the proposed device and the list of the main units included in its composition.

The automatic machine for dimensional sorting of parts contains a vibro-bin 1 with an orienting device 2, a storage unit 3, a transport device with a rotational motor 5, a sensor 6 for monitoring the dimensions of the part 7 and a control unit 8 connected to the measuring unit 9, receiving devices 10 and 11 for suitable and defective parts respectively. Two chucks 12 and 13, mounted on the transport device 4 and equipped with recharging mechanisms 14 and 15 and driving gears 16 and 17, and a locking device 18 mechanically connected to the measuring probes 19 and 20 of the sensor 6 for monitoring the dimensions of the part 7 and connected to the control unit 8. In addition, two linear displacement carriages 21 and 22, two stepper motors 23 and 24, three pneumatic cylinders 25, 26 and 27, a clamp of the monitored part 28 are inserted into the machine. First carriage 21 with control sensors installed on it Sizes 6 and the arresting device 18 reciprocates from the first stepper motor 23 kinematically connected to it, connected to the control unit 8. The second carriage 22 with the second stepper motor 24 mounted on it reciprocates from the first pneumatic cylinder kinematically connected to it 25. The latch 28 controlled products 7 has a tapered groove and reciprocates from the second pneumatic cylinder kinematically associated with it 26. The second step the motor 24 comprises a drive gear 29, which alternately engages with the drive gears 16 and 17 of the clamping chuck 12 and 13, respectively.

The recharging mechanism of FIG. 2 comprises a pusher 30 with a return spring 31, the working end of which is kinematically connected with three cams 32, 33 and 34 of the chuck. The second end of the pusher 30 is kinematically connected with the third pneumatic cylinder 27 connected to the control unit 8.

The machine works as follows.

Products, such as pins radio connectors, from the vibrating hopper 1 using the orientator 2 come in oriented position in the drive 3. The transport device 4, which is equipped with two clamping chuck 12 and 13, equipped with the corresponding drive gears 16 and 17 and recharge mechanisms 14 and 15, have four working positions, indicated in FIG. 1 as I, II, III, IV. At the initial moment of time, the transport disk 4 is in the position I and the part from the accumulator 3 enters the recharging mechanism 14.

The cycle of operation of the machine is performed in accordance with the program recorded in the measurement unit 9 and executed by the control unit 8. At the command of the control unit 8, the second and third pneumatic cylinders 26 and 27 are activated, respectively. The operation of the pneumatic cylinder 26 causes the lifting of the latch 28, which limits the amount of departure of the part 7 from the chuck.

When triggered, the third pneumatic cylinder 27 is pressed on the plunger 30, while the return spring 31 is compressed.

When the pusher is lowered 30, the cams 32, 33 and 34 open. This frees up the space inside the chuck for the passage of the part, which at one end will fall into the conical recess of the retainer 28. Thus, the position of the monitored part 7 is stabilized before it is clamped in the chuck 12.

The next command coming from the control unit 8, retracts the pneumatic cylinder 27 from the pusher 30. The return spring 31 returns the pusher 30 to the initial position and the cams 32, 33 and 34 are closed, clamping part 7. Then, at the command of the control unit 8, the pneumatic cylinder 26 is retracted and the lock is lowered 28. The item is ready for the control procedure. At the command of the control unit 8, the electric motor 5 moves the conveying device 4 to position II, where part dimensions are monitored.

At the command of the control unit 8, the pneumatic cylinder 25, which moves the linear movement carriage 22 with the stepper motor 24 mounted on it and the drive gear 29 to the clamping chuck 13 and the drive gear 17 associated with it, comes in motion. Gears 29 and 17 engage.

The command of the control unit 8 is given and the procedure for loading the next part into the clamping chuck 13, which is in the I position, is performed, and the part from the accumulator 3 enters the recharging mechanism 15. The procedure is similar to that previously described. By the beginning of the measurement of the part 7 in the clamping chuck 12, the procedure for loading the next part into the clamping chuck 13 is completed.

At the next command of the control unit 8, an arresting device 18 is triggered, which arrests (spreads) the measuring probes 19 and 20. At the command of the control unit 8, the stepping electric motor 23 moves the linear movement carriage 21 together with the sensor of the part size control 6 to the part 7. At the command of the unit The control 8 triggers the arresting device 18 and the test probes 19 and 20 are lowered onto the test piece 7 at the place of its exit from the chuck 13. At the same time, the control unit 8 receives the command for the first 23 and second 27 stepper motors. This command stepper motor 24 through the drive gears 29 and 17 rotates the clamping chuck 13 together with the test piece 7. At the same time, the stepper motor 23 moves the carriage of linear movement 21 with the size control sensor 6 mounted on it so that the probes 19 and 20 move along controlled part 7.

Since the part 7 at this time rotates around its axis, the measuring probes 19 and 20 describe the spiral trajectory on the surface of the part 7. Thus, for the measurement cycle of the part being monitored, the diametric size is monitored along the entire working length of the pin. In addition, on each revolution of the part, the non-roundness of the part is determined in accordance with the expression

Δ = d _MAX -d _MIN ,

where d _MAX and d _MIN are the maximum and minimum diameters of the tested part, respectively.

In general, the selected method of controlling the geometric parameters of the pin ensures the required quality and eliminates the entry of defective parts into suitable ones.

At the end of the cycle, measurement unit 9 analyzes, stores measurement information and, together with the control unit, generates a command that takes the transport device to position III (suitable parts), or to position IV (defect), where they fall respectively into receiving device 10 or 11.

The practical implementation of the proposed device is carried out in the control machine KI1502, the appearance of which is shown in FIG. 3, developed jointly by Togliatti State University and OJSC Electroconnector, Sec. Urussu, Republic of Tatarstan. The automatic machine KI1502 contains a vibro-bunker 1 with an orienting device 2, a cabinet with a vibro-support system 35. All mechanical components and parts listed in the description of the invention are placed in a special power frame made of aluminum profile 36. The control unit 8, measuring unit 9, is fixed on the same frame, the light signaling column 37, signaling the mode of operation of the machine.

SPECIFICATIONS

1. Number of measurement channels 2 2. Measurement range in each channel
(for each size of the part), mm ± 0,200  tuning, in the form of sensor readings  measuring, in the form of a table of actual values 3. Type of information provided  final with a form error estimate  calibration information  profilogram 4. Time of adjustment of the machine to another size, not more than, min thirty 5. Time of continuous work, no less than an hour sixteen 6. Performance of the machine with the load factor k = 0.8 and single shift operation, not less, pcs / month 40 × 10 ³ 7. Power consumption, VA, not more than 200 8. Power

; 50±1 Гцfrom 110 to 220 V

; 50 ± 1 Hz 9. Air pressure in the system, MPa from 0.4 to 0.6 10. Overall dimensions, mm:  measuring block ACK1547 310 × 120 × 265  control unit ACK1502 400 × 500 × 150  measuring device IP1502 complete with pneumatic automation panel 650 × 720 × 440 11. Weight, kg, not more than:  measuring block ACK1547 5.5  control unit ACK1502 10.0 measuring device IP1502
complete with pneumatic automation panel 110

Claims (4)

1. An automatic machine for dimensional sorting of cylindrical asymmetrical parts, for example, pins of radio engineering connectors, containing a vibrating bunker with an orienting device, a drive, a transporting device with a rotating electric motor, a sensor for controlling the dimensions of a part and a control unit connected to the measuring unit, receiving devices for suitable and defective parts, characterized in that it has two chucks inserted on the transporting device and equipped with recharge mechanisms and drive gears, a locking device connected mechanically with the measuring probes of the part dimensions control sensor and connected to the control unit, two linear motion carriages, two stepping motors, three pneumatic cylinders and a clamp of the part being monitored, the first carriage with the size control sensor and the arresting device making it reciprocating motion from the kinematically connected with it the first stepper motor connected to the control unit, and the second carriage with ennym thereon a second stepper motor reciprocates by motion kinematically associated first air cylinder. 2. The device according to claim 1, characterized in that the latch of controlled products has a tapered recess and makes reciprocating movements from the second pneumatic cylinder connected to the control unit kinematically connected with it. 3. The device according to claim 1, characterized in that the second stepping motor includes a drive gear, which alternately engages with the drive gears of the clamping chuck. 4. The device according to PP. 1-3, characterized in that the recharging mechanism includes a spring-loaded pusher, the working end of which is kinematically connected to the three jaws of the chuck, and the second end is kinematically connected to the third pneumatic cylinder connected to the control unit.