RU72066U1 - DEVICE FOR TESTING AND AUTOMATICALLY DISCONNECTING COMPRESSION SPRINGS - Google Patents

Abstract

A device for testing and automatic rejection of cylindrical compression springs, comprising a mechanism for forced compression of the springs using a power cylinder, a force measuring device based on a force sensor that controls the compression force of the spring and has several measurement channels associated with the range of test loads; electronic unit, sorting mechanism, separating rejected springs from suitable; a central processor and a power supply, characterized in that each measurement channel contains corresponding power test cylinders having sensors for measuring the position of the rod and connected to the test spring; air supply to the power cylinders is controlled by electro-pneumatic valves; the device has an electronic measuring module, which is a local area network that combines the controller of the control unit and the transducers of displacement and force sensors; information on the design characteristics of the springs is digitally recorded in the memory of the electronic measuring module; in the control and measuring module, information on the parameters of the measured springs is compared with structural; on the basis of this, a decision is made on the suitability or rejection of the springs, which is displayed on the indicator device and display; after testing the springs in the sorting mechanism, automatic sorting and accumulation of suitable and unsuitable springs with their calculation takes place.

Description

A utility model for a device relates to a test technique. The device is intended for dynamic testing and measurement of the power characteristics of compression springs during their production, as well as in the repair of devices, devices and machines incorporating compression springs.

Known automatic line for the manufacture, testing and sorting of coil springs. In this device, the loader feeds the rod blanks to the heating furnace, after which the blanks enter the spring-coiling machine. After quenching, tempering and processing in a shot blasting plant, the springs are individually delivered to the section of the stepper conveyor of the plant to control the force of the springs. In the forced compression mechanism, the first power cylinder introduces a conical mandrel into the end of the spring and moves it with its rod along the conveyor section to another conical mandrel. Then the spring is installed on the second mandrel, where it is controlled by compression. Then the spring is fed into the force measuring device, where a similar conical mandrel is inserted into one of the ends of the spring by the second power cylinder. The springs are moved using mandrels mounted on the rods of the device along the guide elements of the housing. When the end face of the spring comes into contact with the force measurement sensor, the rotary mechanism rotates the rod. In this case, the springs are screwed on both sides of the mandrel, one side on the mandrel mounted on the rod, and the other side on the mandrel mounted on the rod of the second power cylinder. With the further course of the rod of the second power cylinder, the spring is compressed. The sensor measures the spring force at a given deformation. During the return stroke of the rod, the spring is removed from the mandrels and fed to the sorting mechanism. Then the spring is discharged by the pushers into one of the outlet trays [1]. The disadvantage of this device is an inconvenient and low-tech way to fix the springs on the mandrel and transport them inside the device for measuring and sorting.

A well-known stand for dynamic testing of compression springs. It provides a given load mode for the test springs. The stand contains a pneumatic accelerating-brake device, including a pneumatic cylinder with a piston and a rod. The cavity of the pneumatic cylinder is divided into two chambers (piston and rod), communicating with each other by

throttle bore in the piston. The stand also has a device for returning the piston to its original position. Regarding the piston, the receiver is concentrically located connected to the compressed air line. The rear flange of the cylinder is made in the form of a shut-off valve with a pneumatic membrane-spring actuator, and the spool and the membrane of the mechanism are, respectively, the bottom of the piston chamber and receiver. A sealed container is fixed on the cylinder with the possibility of filling with a lubricating fluid, in the cavity of which a guide rod is mounted cantilever on the same axis as the piston rod. The test spring is placed on the rod with an emphasis on the end face of the piston rod. The free end of the guide rod is inserted into a hole made along the axis of the piston rod, the residual depth of which is greater than the working stroke of the tested spring [2]. The disadvantage of this device is the inability to test for a wide range of springs, the characteristics of which are very different from each other. In addition, the rejection of the springs is based on subjective decision-making by the operator.

The aim of the invention is to expand the range of measured springs, automate the process of measuring and sorting the springs, creating a convenient for the process of measuring and sorting the springs mechanism for moving them inside the device.

This goal is achieved in that the device extends the range of loads through the use of several measuring presses having different load ranges. In one device, which includes a pneumatic power cylinder and transmitting the load measured by a force sensor to a coil spring, several power cylinders connected with the corresponding measuring channels are used. In this case, the height of the tested coil spring and the force applied to it are measured by means of a measuring press in a certain measuring range. The movement of the springs inside the device is carried out in the mandrels of interchangeable pallets.

A device for testing and automatic rejection of springs contains: measuring presses with different load ranges, mechanisms: feeding under the measuring press, moving the springs inside the device, sorting the measured springs into suitable and unfit, unloading the springs from the device.

As an example of a specific embodiment, Figs. 1, 2 and 3 show a machine for testing and automatic rejection of springs, having three measuring ranges (the first range with a measuring channel of up to 10 kg, the second

range with a measuring channel up to 100 kgf, the third range with a measuring channel up to 1000 or up to 5000 kgf). The air supply to the power cylinders is carried out using electro-pneumatic valves controlled by an electronic measuring unit. This unit is a local network uniting the controller of the control unit with the transducers of displacement and force sensors.

Information about the design parameters of the springs is recorded in the processor memory in digital form. Information about the power characteristics of the tested springs from the sensors in digital form enters the electronic measuring unit. This compares the design characteristics of the springs with the characteristics of the tested springs. At the same time, the springs are automatically rejected and sorted, accumulated and counted. Based on this information, a decision is made on the suitability or rejection of the springs, which is displayed on the display and on the indicator.

Figure 1 shows a block diagram of the device, and figure 2 and 3 shows the design of a device for testing compression springs (its front view and top view). In figures 1, 2 and 3, the following digital designations are adopted: 1 - a sensor for measuring the position of the rod of the first range; 2 - force measurement sensor on the rod of the first range; 3 - sensor measuring the position of the rod of the second range; 4 - force measurement sensor on the stock of the second range; 5 - sensor measuring the position of the rod of the third range; 6 - force measurement sensor on the rod of the third range; 7 - discrete signal distribution module (for a table with measuring presses for forces up to 10 kgf and for forces up to 100 kgfs); 8 - discrete signal distribution module for a pedestal with a measuring press for a force of up to 1000 or 5000 kgf; 9 - control unit; 10- power supply unit; 11 - table; 12 - measuring press on a force of up to 10 kgf; 13 - measuring press on a force of up to 100 kgf; 14 - measuring press on a force of up to 1000 kgf or up to 5000 kgf; 15 - table cylinder for the first measurement range; 16 - table cylinder for the second measurement range; 17 - carousel drive; 18 - window for unloading the measured springs; 19- drive defective springs; 20 - cut-off suitable springs; 21 - cutter cylinder; 22 - drive suitable springs; 23 - table air distributor; 24 - a curbstone; 25 - mandrel; 26 - pneumatic cylinder stands; 27 - pallet; 28 - cylinder loading pallets; 29 - cylinder drive doors; 30 - air diffuser; 31 - indicator.

The device contains sensors for measuring the position of the rod: first range 1, second range 3, third range 5; measurement sensors

forces on the rod: the first range 2, the second range 4, the third range 6. It includes modules for the distribution of discrete table signals and cabinets 7 and 8, a control unit 9 and a power supply 10. The electronic measuring part of the machine is a local network and combines the controller of the control unit 9 with transducers of sensors 1, 3, 5 and 2, 4, 6. Separately, the distribution modules for discrete signals 7 are connected to the control unit 9 (for a table with measuring presses for forces up to 10 kgf and for forces up to 100 kgf) and 8 (for cabinet with measuring pres th on the force of up to 1000 kg or 5000 kg). The control unit 9 collects information from the sensors 1, 2, 3, 4, 5 and 6 and controls the actuators according to the selected operating mode.

Structurally, the device is a table 11 on which are installed measuring presses 12 for a force of up to 10 kgfs and press 13 for a force of up to 100 kgfs. The measuring press 14 for a force of up to 1000 kgf or up to 5000 kgf is mounted in the floor stand 24, located separately from the table. The presses 12 and 13 are equipped with displacement sensors for measuring the height of the spring 1 and 3, as well as sensors for measuring the force 2 and 4; The electro-pneumatic valves that control the supply of compressed air to the pneumatic cylinders 15 and 16 are installed on the table air distributor plate 23. The springs for measuring in the first and second load ranges (up to 10 kgf and up to 100 kgf) are loaded into mandrels 25 mounted on rotary drives 17, and for measurements in the third load range (up to 1000 kgf or up to 5000 kg) - to pallets 27. After the measurement, defective springs from the devices of the first and second load measuring ranges fall through the windows 18 into the drive 19, and the suitable ones are sent to a cylinder 20, driven by a cylinder 21, into an accumulator of suitable springs 22. A measuring press 14 is located in the floor cabinet 24 for a force of up to 1000 kgf or up to 5000 kgf driven by cylinders 26. The measuring spring is loaded into a pallet 27 extended by the drive cylinder pallets 28. The measurement zone is enclosed by a door, driven by a door drive cylinder 29. The electro-pneumatic valves that control the supply of compressed air to the cylinders of the cabinet are installed on the plate of the air distributor 30. The control unit 9 and the power supply unit 10 are installed pour on the table 11.

The device operates as follows. The springs for measurement are loaded into mandrels 25 installed on the rotary drives 17. Depending on the type of spring, they are installed in the corresponding rotary drive on the desired measuring channel. Pressure Sensors

spring height meters 1 and 3 and sensors of the force meter 2 and 4 applied to the spring take characteristics of the tested springs. The electro-pneumatic valves control the supply of compressed air to the pneumatic cylinders 15 and 16 of the table 11. After measurement, the framed springs fall through the window 18 into the defective springs accumulator 19, and the suitable springs are guided by the cutter 20, which is actuated by the cylinder 21, into the suitable springs accumulator 22. The control unit 9 collects information from sensors 1, 3, 2, 4, 5, 6 and controls the actuators according to the selected operating mode. The decision on the suitability or rejection of the springs is displayed on the indicator device 31 and the display 31. During the test of the springs, the suitable and rejected springs are automatically sorted and accumulated with their counting. Data on the tested springs are stored and, if necessary, recorded, after which they can be further processed.

The technical effect of the claimed device lies in the fact that it allows you to control the springs in terms of stiffness and height in the range of working drawdowns of springs for a wide range of cylindrical compression springs of various types. In addition, it automates control and measuring operations and rejects springs, eliminating the subjectivity of estimates and operator errors. The placement of springs in pallets and carousel drives simplifies the process of moving the springs inside the device.

Information sources

1 Patent RU No. 20055572 of 04.16.1992, MKI B21F 3/00.

2 RU patent No. 2138794 from 11.25.1997, MKI G01M 17/04.

Claims (1)

A device for testing and automatic rejection of cylindrical compression springs, comprising a mechanism for forced compression of the springs using a power cylinder, a force measuring device based on a force sensor that controls the compression force of the spring and has several measurement channels associated with the range of test loads; electronic unit, sorting mechanism, separating rejected springs from suitable; a central processor and a power supply, characterized in that each measurement channel contains corresponding power test cylinders having sensors for measuring the position of the rod and connected to the test spring; air supply to the power cylinders is controlled by electro-pneumatic valves; the device has an electronic measuring module, which is a local area network that combines the controller of the control unit and the transducers of displacement and force sensors; information on the design characteristics of the springs is digitally recorded in the memory of the electronic measuring module; in the control and measuring module, information on the parameters of the measured springs is compared with structural; on the basis of this, a decision is made on the suitability or rejection of the springs, which is displayed on the indicator device and display; after testing the springs in the sorting mechanism, automatic sorting and accumulation of suitable and unsuitable springs with their calculation takes place.