SU993052A1 - Automatic device for checking spring force - Google Patents

Description

one

The invention relates to a measuring technique and can be used in all sectors of the national economy where mass control of cylindrical compression springs is required, for example for controlling springs providing certain contact pressure forces in electrical apparatus when testing compression springs of repaired vehicles and agricultural vehicles. cars, etc.

A device for controlling springs is known comprising a drive device associated with a feeding mechanism and a loading mechanism 1.

The performance of the control and its accuracy are small, since the machine uses reference springs, in addition, the measuring nodes are cumbersome, which also complicates the setup of the machine to control the springs.

The closest in technical essence to the proposed is

a device for measuring the elastic characteristics of the springs, comprising a drive device associated with the feeding mechanism and the spring loading mechanism, and a device for measuring the height of the spring in contact with the loading mechanism and connected with the load measuring device L2j.

However, such a device for measuring the elastic characteristics of the springs

10 does not take into account the non-parallelism of the bases of the tested spring, which reduces the quality and productivity of the control process.

The purpose of the invention is to increase the quality and productivity of the control process.

This goal is achieved by the fact that the machine is equipped with a device for controlling the parallelism of the base of the spring, made in the form of a test platform rigidly connected to the rod, connected through a spherical hinge to the case rigidly mounted on the load-bearing device and connected to the sensor of the angular position of the rod.

FIG. 1 schematically shows an automatic device for controlling springs; in fig. 2 shows section A-A in FIG. 1J in FIG. 3 is a diagram of a spring height meter; in fig. k - diagram of the device controlling the parallelism of the bases of the spring.

The spring control machine includes (fig. 1) the feed mechanism consisting of the driven gear-feeder 1, on which the fixing sleeves 2, the ejection tray 3 and the feeder tray k are fixed (fig. 2); a drive unit having a gear motor 5, which rotates a drive shaft 6, periodically moving through an intermittent transfer 7 of the Maltese cross type, the driven shaft: 8 and pinion gear 9 gear reducer 1, a loading mechanism consisting of a sequential loading cam 10, acting on the test spring placed on the support table 11; a force-measuring device consisting of a rod 12 and a power lever 13 acting on a piston rod of a cylinder 1 with a liquid, whose pressure is controlled by an electro-contact pressure gauge 15 A device 16 is fixed on a rod 12 of a force-measuring device for continuously monitoring the height of a spring consisting of a toothed rack 17 spiraling to the support table 11, toothed gears with movable arrow magnet 18 and reed switches 19 electrically connected to the load-bearing device (Fig. 3)

The device 20 for controlling the parallel base of the spring is fixed on the rod 12 and includes the following components (Fig. 4): case 21, test platform 22 having a pin with spherical protrusion 23 crunches 2 and a deflection sensor 25, for example, of an electrocontact type. The spherical protrusion 23 and the grooves in the croutons 2k form a spherical hinge. The rod with a spherical protrusion 23 acts on the sensor 25 Crackers 2 posted {) | in the conical recess of the housing 21 and may make small movements in the axial direction.

The device works as follows.

The spring being tested comes from the feeder tray into the fixing sleeve 2 of the gear-feeder 1. With the next rotation of the gear-feeder 1, carried out with the help of - transfer 7 intermittently, the spring is moved to the test position, while the spring is fixed by the reference Table II and the test platform 22 of the device 20 of the control of the parallelism of the bases of the spring. At this stage, using a device for continuous measurement of the spring height, the spring height is monitored in a free state. When this parameter is within acceptable limits, the arrow-magnet of the gear wheel 18 acts on the corresponding reed switch 19 whose closure is recorded by a control device (not shown). When the cam 10 is rotated in succession, the support table 11, moving up, begins to compress the spring under test. The achievement of the first control deformation is recorded by the corresponding reed switch 18 of the device for continuous measurement of the spring height, which sends a signal to the force-measuring part to measure the first working force by an electric contact gauge 15. With further compression of the spring, the second working force is similarly monitored. The spring is thrown into the ejection tray 3 at the next movement of the gear-feeder 1.

When the spring is compressed at the test position, the test platform 22 displaces the crackers 2k in the conical recess of the housing 21 by the amount of backlash, whereby the crackers 2 compress the spherical protrusion of the rod 23, fixing the test platform 22 in the position where the bottom plane of the test platform 22 turns out to be parallel to the upper base of the spring. In this case, the rod 23 deviates from the axis by an angle of 0 ° equal to the angle of non-parallelism of the spring bases, 8 if the angle o does not exceed the permissible value, the rod 23 acts on the sensor 25. As a result, a signal is recorded that the spring is valid for this parameter. Next, the spring is fed into

ejection tray 3 where controlled springs are sorted.

Due to the fact that the device for controlling the parallelism of the spring bases is inserted into the spring control device, the machine allows control of the spring bases parallelism and its length in a free state, which improves the quality of control. The control of these parameters is carried out simultaneously with the control of the pressure; the total efforts of the measured silismicating device according to the signals of the device for continuous measurement of the spring height. This allows the axis to be (the process is the whole control process at one working position), which greatly improves its performance.

Claims (2)

1. USSR author's certificate If 623118, cl. G of Ll / Ot, 1978. 2. USSR author's certificate K 739350, cl. G 01 L I / O, 1980, (prototype). 15 G2x 74 f3 ( 20 P-, 16 r 22 L 2