RU1819201C - Translation electromechanical sensor - Google Patents

Abstract

Use: for measuring linear displacements in flash butt welding. SUMMARY OF THE INVENTION: The sensor is made in the form of a compression spring, which interacts with one supporting surface with the movable part of the housing and the other directly with the transducer rigidly mounted on the fixed part of the housing. 2 ill.

Description

The invention relates to welding and can be used in contact butt welding machines.

The purpose of the invention is to increase the reliability and accuracy of measuring linear displacements in resistance welding.

This is achieved in that in a known sensor comprising movable and fixed parts of the housing and a transducer; the sensor is made in the form of an elastic element, which interacts with the moving part of the housing with one supporting surface, and interacts directly with the transducer rigidly mounted on the fixed part of the housing with the other supporting surface.

In this case, the elastic element is made in the form of a compression spring.

The implementation of the sensor in the form of an elastic element, which interacts with the moving part of the housing with one supporting surface and interacts directly with the transducer rigidly mounted on the fixed part of the housing, provides accurate measurement of linear displacements during resistance welding due to the fact that when moving the moving part the body, the elastic force changes upon deformation of the force-absorbing elastic element in proportion to the linear displacement value.

The implementation of the elastic element in the form of a compression spring provides increased reliability due to the fact that the compression spring has a high efficiency.

In FIG. 1 shows the proposed sensor, a General view in section: figure 2 is a schematic diagram of the installation of the sensor on a contact welding machine.

The sensor (Fig. 1) consists of a fixed 1 and a movable 2 part of the housing, transform

Yu N) Oh

With

a cotton-eye 3, rigidly mounted on the fixed part 1 of the body, and an elastic element 4 with supporting surfaces 5 and 6. The elastic element 4 interacts with the movable part 2 of the housing 5 and the other supporting surface 6 directly interacts with the converter 3. On the movable Part 2 of the body is affected by the force P. The movement of which counteracts the force Ru of the element 4 through the abutment surface. the abutment surface 6 forces Ru acts on the transducer 3. The displacement force P exceeds the force Ru of the elastic element 4 in magnitude.

The design of the sensor (see FIG. 1) is designed to measure and control the linear movements of the movable body of the welding machine and is suitable for determining the speed of fusion, the amount of fusion and draft, as well as for programming the welding process.

The mounting diagram of the sensor on a contact welding machine (Fig. 2) consists of a movable 7 and a fixed 8 casing of the welding machine, a welding transformer 9, a sensor 10, a block 11 for programming the welding process and a drive 12 for moving the movable 7 casing with the parts to be welded 13 and 14. Elastic element 4 (FIG. 1) of the sensor 10 (FIG. 2) is made in the form of a compression spring 15.

The parts to be welded 13 and 14 are driven by a movement actuator 12, which is controlled by the welding process programming unit 11. The input of the welding programming unit 11 is connected to the output of the sensor 10, movable 2 (Fig. 1) and fixed 1 of the body part of which is rigidly connected to the movable 7 (Fig. 2) and fixed 8 casings of the welding machine. The movable 7 and the stationary 8 of the welding machine body are connected to the secondary winding of the welding transformer 9, the primary winding of which is connected to the supply network Uc.

The sensor operates as follows.

With a command from the welding process programming unit 11 to the movement drive 12, the movable 7 body with part 13 starts linear movement to the stationary 8 body with part 14. In this case, the moving force P acts on the movable 2 part of the sensor housing 10, which acts on the elastic element 4 As a result of this, a force Ru of the elastic element 4 arises, which counteracts the displacement force P through the abutment surface 5 and acts on the transducer 3 through the abutment surface b. Since the displacement force P is larger than force Ru of the elastic element 4, then when moving the movable body 7 elastic

element 4 is compressed, the force Py varies in magnitude. By the transducer 3, the force Ru of the elastic element 4 is converted into an electrical signal. As a result, the linear movement of the movable body 7 of the welding machine turns into a variable electrical signal.

During the movement of the movable housing 7, the force Py changes according to the law of the elastic deformation of the elastic

5 of element 4. When the elastic element 4 is made in the form of a compression spring 15, in which the compression force varies according to Hooke's law in proportion to the linear value of compression, an analog electrical signal is recorded at the output of the sensor 10 in accordance with the movement of the movable housing 7. This signal is fed to the input of the welding programming unit 11, in which it is used to give 5 commands to change the speed of movement of the welded parts, to switch the welding voltage, to switch on the draft and to turn off the welding voltage while stopping

0 of the movable body of the welding machine, as well as for recording linear displacements (magnitude and speed) with a measuring device.

When performing the elastic element 4, /

5, for example, in the form of a pneumatic cylinder, an electric signal that changes exponentially is recorded at the output of the sensor 10 and must be converted to linearly varying 0 s. However, this requires a more complicated construction of the transducer compared to an elastic element made in the form of a compression spring, which reduces the speed of the process programming system

5 welding and measurement accuracy.

The converter 3 is rigidly mounted on the stationary part 1 of the housing, since the welding process programming unit 11, to which the converter 3 is electrically connected, is stationary. As a result, spherical communication is performed by a rigid connector, which ensures high availability and reliability. When installing, for example, transformer 5 of bodies 3 on the movable 2 part of the housing, it will be necessary to make the electrical connection between transducer 3 and block 11 flexible. However, a flexible link has less reliability than a rigid link.

The elastic element 4 interacts with the moving part 2 of the housing with one supporting surface 5, and interacts directly with the transducer 3 with the other supporting surface 6, which ensures the operability of the sensor. When, for example, the abutment surface 5 interacts with the fixed part 1 of the housing, the sensor is inoperative.

The sensor can be used in control circuits of butt welding machines in which the programming of the welding process is carried out according to the linear value of the movement of the movable body of the welding installation. This sensor is most suitable for use on welding machines with high-speed hydraulic actuators based on hydraulic power amplifiers or proportional directional control valves.

Claims (1)

, Tests of the sensor on machines of type: K-355 when welding rails showed that reliability lasts at least 10s cycles and the measurement accuracy is 0.1 mm. The claims An electromechanical linear displacement transducer comprising stationary and movable elements interconnected via an elastic element, and a transducer, characterized in that, for the purpose of to increase the reliability and accuracy of measuring displacements in flash butt welding by eliminating inertia and friction losses, the fixed and movable elements are made in the form of semi-bodies for installation on the fixed and mobile bodies of the butt welding machine, the elastic element is made in the form of a compression spring installed with the possibility of interaction of one supporting rto-surface with a movable half-housing, the other with a converter mounted on a fixed half-housing. FIG. I} / 6 U / J Figure 2