SU805083A1 - Test-bed for spring mechanisms - Google Patents

Description

one

The invention relates to the testing of products and structures.

A known installation for testing springs, including a load device, a spring supply mechanism and measuring units 1.

The disadvantages of this setup are the small measurement range and the impossibility of obtaining the dependence of the force on the magnitude of the deformation in the entire measurement range.

Closest to the technical essence and the achieved result is an installation comprising a diagram of an apparatus connected to strain and force measurement systems, a digital information block, an electric actuator, kinematically connected to strain gauges and forces of measurement systems 2).

The disadvantages of this setup are the lack of automation of the testing process and the low accuracy of the force measurement.

The purpose of the invention is to automate the testing process and improve the accuracy of force measurements.

This goal is achieved by the fact that the installation for testing spring mechanisms, including a digital device connected to the systems of measuring deformation and force, a block of digital information, an electric drive, kinematically connected

with sensors of deformations and forces of measurement systems, it is equipped with a unit for setting limit deformations, a switch of the electric drive and a coincidence circuit, the inputs of which are connected

with the outputs of the task limit block

deformations and digital outputs of the digital display unit, and the output of the coincidence circuit is connected to the first input of the switch, the second

the switch input is connected to the sign output of the digital display unit; the switch outputs are connected to the electric drive.

In addition, the force sensor is made in the form of an inductive transducer with a movable element and an elastic arm, and the transducer is mounted for movement

along the console, the movable element is connected to its free end, and the spring mechanism is connected to the co-salt at a point, 0.10-0.17 of its length from the base of the console. FIG. 1 is a structural wiring diagram of the installation; in fig. 2 attachment unit for the force sensor and the spring mechanism to be tested; Fig. 3, the characteristic of a spring mechanism tested, recorded on a diagram device, The installation for testing spring mechanisms contains a load measurement system 1, a deformation measurement system 2 with a digital indication unit 3, a diagram 4 electro drive 5, a xmmutator 6, a circuit 7, block 8, the setting of the limit deformation, the converter 9, the amplifier 10, the spring 11 mechanism being tested, j is an elastic arm 12. The unit operates as follows. In block 8, the setting of limit deformations, using the switches, set the limit working magnitude for compressing or stretching the tested spring mechanism 11, engaging the actuator 5 for compressing or stretching the spring mechanism 11. The amount of deLormation (compressing or stretching) of the spring mechanism 11 formed by a strain measurement system 2, consisting of a potentiometer (not shown) and an amplifier in correspondence with the value of an electrical signal, which is fed to the Olok 3 digital display of strain, and 4. The magnitude of the force of the spring mechanism 11 through the load measurement system 1 is fed to another coordinate of the chart apparatus 4. Thus, there is a continuous process of recording the dependence of the force on the deformation value of the spring mechanism until the strain value on block 3 is digital the indication will not reach the value of the limit deformation typed on block 8. If the values on the limit deformation block 8 and the digital display unit 3 are equal, the coincidence circuit 7 operates, the signal from which is sent to the switch b. From the digital indication unit 3 to the switch, the signal sign “,. those. the compression process is in progress, the coiviutator issues the first reverse signal to the electric drive 5 and begins with the process of stretching the spring mechanism to the same amount of limiting deformation of another sign of stretching. When the maximum stretch limit is reached, the yes signal is received from the matching circuit 7, and the sign signal from the digital display unit 3 is not received in the switch b (sign - i.e. stretch sign, corresponds to the absence of a signal) and the switch 6 outputs the 2nd reverse signal to the electric drive 5 and the compression process starts again (Fig. 3). This order of operation can continue continuously until the Stop button is pressed on the electric drive in the 1st mode of operation, or automatically stopped at one of the limiting deformation points in the 2nd mode of operation, or automatically stopped at the zero (initial) state in 3 em operation mode. Such an order of work allows one to automate the process of testing different types of mechanisms (mechanisms with different values of limiting deformations), since with the help of a unit of limiting deformations, any amount of deformation can be gathered, which improves the plant performance. Using the force of the inductive transducer 9 displacements and the elastic arm 12 (Fig. 2) in the load measurement system when installing the inductive transducer with the ability to move along the console and the spring mechanism at the support point of the console makes it possible to effectively use the method of measuring, generating mechanical force (load ) by measuring the deflection of the free end of the elastic arm 12, which expands the limits of the load measurement and increases the reliability of the measurement system. In addition, an inductive transducer mounted with rewinding along a cantilever allows you to change the ratio C of the distance C c to the distance L (Fig. 3) and makes it possible to change the sensitivity of the load measurement system within wide limits and easily tune the deformation of the elastic cantilever in Units strength Moreover, in order to reduce the error in measuring strain, the distance should be much less than the distance b. The best test results,. are achieved by installing the tested spring mechanism at a distance of 0.10–0.17 of the length of the cantilever from its base. When the spring mechanism is installed at a distance of less than 0.10 length from the cantilever base, the accuracy of strain measurement decreases, and at a distance of more than 0.17 cantilever length, the sensitivity of the load measurement decreases. FIG. Figure 3 shows a diagram of the spring mechanism under test when installed at a distance of 0.14 of the length of the cantilever from its base. The installation for testing spring mechanisms allows one to automate the process of testing spring mechanisms, to increase the productivity of the process when testing different types of spring mechanisms, to expand the limits of load measurement and to increase the accuracy of measurements.

Claims (2)

Claim 1. Installation for testing springs? mechanisms, including a diagram apparatus connected to deformation and force measurement systems, a digital information unit, an electric drive kinematically connected to deformation and force sensors, measurement systems, characterized in that, in order to automate the testing process, the installation is equipped with a unit for setting ultimate deformations, an electric drive switch and a matching circuit, the inputs of which are connected to the outputs of the limit deformation task unit and to the digital outputs of the digital display unit, and the output of the matching circuit is Inonii the first input switch, said second switch input coupled to the output of the digital sign indication and KoiwyTatora outputs are connected electrically. 2. The installation according to claim 1, with the fact that in order to improve the accuracy of force measurements, j perform a force sensor! in the form of an inductive transducer with a movable element and an elastic cantilever, and the transducer is mounted for movement along the cantilever, the movable element is connected to its free end, and the spring mechanism is connected to the cantilever at a point 0.10- 0.17 of its length. 15 Sources of information taken into account in the examination 1. Copyright certificate of the USSR In 647558, cl. G 01 L 1/04, 1977. 2. USSR copyright certificate 20 I ”139133, cl. G 01L 1/04, 1960.