CN103884615A - Control system of test stand for testing wear precision of rails - Google Patents

Abstract

A control system for a guide rail wear accuracy test bench, comprising an upper computer and a lower computer communicating with the upper computer through a serial port, the signal input ends of the lower computer are respectively connected to friction sensors for detecting the friction force of the guide rail, and for detecting the load of the guide rail The load sensor and the signal output end of the straightness sensor used to detect the straightness of the guide rail, the signal output end of the lower computer is respectively connected to the main motor driver for driving the main motor of the tested guide rail to work, and for driving the straightness sensor The secondary motor driver that moves the secondary motor works. The main motor adopts a servo motor. The secondary motor adopts a stepping motor. The friction sensor is composed of tension and pressure sensors, the load sensor is composed of load measuring sensors, and the straightness sensor is composed of digital dial gauges. The invention not only can quickly evaluate the friction and wear performance of the guide rail pair, but also can display the attenuation of straightness caused by wear in real time.

Description

Control System of Rail Wear Accuracy Test Bench

technical field

The invention relates to a control system. In particular, it relates to a control system of a guide rail wear accuracy test bench.

Background technique

Accuracy retention is a key performance index of high-precision machine tools. As the core component of the feed system of high-precision machine tools, the guide rail pair determines the feed accuracy and accuracy retention performance of the machine tool. The sliding guide rail pair is a commonly used support and feed component in the machine tool system, and friction and wear are the most important factors affecting the working accuracy of the sliding guide rail pair. Under laboratory conditions, use the guide rail wear accuracy test bench to study the wear performance of the sliding guide pair under different material compositions, different working parameters and different lubrication conditions and the accuracy attenuation law caused by wear. Performance matters.

In order to conveniently control the parameters of the test bench accurately and obtain high-precision experimental results, the corresponding control system is very important. The control part of similar testing machines produced in China is mostly realized by voltage adjustment, and the control accuracy is difficult to meet the requirements, and its data processing ability is poor, and the system error is large. How to use the microcomputer control system and bus transmission mode to realize real-time control, how to automatically and efficiently collect and process data, and develop an easy-to-operate software interface are the keys to improving the experimental level of guide rail wear accuracy, which is also the technical problem that the present invention strives to solve.

Contents of the invention

The technical problem to be solved by the present invention is to provide a control system of a guide rail wear precision test bench with high control precision, strong data processing capability and high automation level.

The technical solution adopted in the present invention is: a control system of a guide rail wear accuracy test bench, including a host computer and a lower computer communicating with the upper computer through a serial port, and the signal input terminals of the lower computer are respectively connected to detect the guide rail The friction sensor for friction, the load sensor for detecting the load of the guide rail and the signal output end of the straightness sensor for detecting the straightness of the guide rail, the signal output ends of the lower computer are respectively connected to drive the tested guide rail to run The main motor driver works with the main motor, and the auxiliary motor driver works with the auxiliary motor used to drive the straightness sensor to move.

The main motor is a servo motor.

The secondary motor adopts a stepping motor.

The friction sensor is composed of a tension and pressure sensor installed in the guide rail wear accuracy test bench, and the friction sensor sends the measurement result to the lower computer in the form of analog quantity.

The load sensor is composed of a load measurement sensor arranged in the load application module of the guide rail wear accuracy test bench, and the load sensor sends the measurement result to the lower computer in the form of analog quantity.

The straightness sensor is composed of a digital dial gauge installed in the straightness measurement module of the guide rail wear accuracy test bench, and the straightness sensor sends the measurement results to the lower computer in the form of digital quantities.

The control system of the guide rail wear precision test bench of the present invention can not only quickly evaluate the friction and wear performance of the guide rail pair, but also can display the attenuation of straightness caused by wear in real time. It has the following advantages and positive effects:

1. High control precision

The main motor adopts a servo motor. With its high-precision speed servo characteristics and high positioning accuracy, the guide rail wear accuracy test bench system has the characteristics of large speed adjustment range and high operation accuracy. The auxiliary motor adopts a stepping motor, which has the characteristics of fast response speed and high repeat positioning accuracy.

2. Strong data processing ability

The lower computer receives the analog signal of the friction sensor, the analog signal of the load sensor and the digital signal of the straightness sensor, and performs necessary processing on the signal.

3. High level of automation

The upper computer finally realizes the control of the movement of the main and auxiliary motors through the lower computer, collects various data of the test bench, and processes the collected data. These tasks can be completed without the participation of testers, so they have great potential. High level of automation.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is A-A sectional view of Fig. 1;

Fig. 3 is a partial schematic diagram of a slider sample mounting plate of the present invention;

Fig. 4 is the top view of Fig. 3;

Fig. 5 is a block diagram of the control system of the guide rail wear accuracy test bench of the present invention.

In the picture:

1: Servo motor; 2: Motor mounting plate; 3: Coupling; 4: Front support plate; 5: Ball screw; 6: Mounting plate of guide rail sample; Slider sample; 10: Rear support plate; 11: Slider sample mounting plate; 12: Tensile pressure sensor; 13: Load adjustment screw; 14: Load adjustment nut; 15: Load spring; 16: Digital micrometer Table; 17: lead screw; 18: stepping motor; 19: support guide rail; 20: installation top plate; 21: rear thrust plate; 22: load measurement sensor; 23: load measurement sensor installation plate; 24: front thrust plate ;25: ball screw nut; 26: screw nut top plate; 101: upper computer; 102: lower computer; 103: friction sensor; 104: load sensor; 405: straightness sensor; 106: main motor driver; 107: Main motor; 108: auxiliary motor driver; 109: auxiliary motor.

Detailed ways

The control system of the guide rail wear accuracy test bench of the present invention will be described in detail below in combination with the embodiments and the accompanying drawings.

The control system of the guide rail wear accuracy test bench of the present invention is used on a guide rail wear accuracy test bench. The guide rail wear accuracy test bench is shown in Figures 1 to 4, including a support frame, a guide rail pair simulation module, a load application module, a straightness measurement module and a friction measurement module.

Described support frame comprises installation bottom plate 7, front support plate 4, rear support plate 10 and installation top plate 20, and described front support plate 4 and described rear support plate 10 are vertically affixed on described installation base plate 7 respectively, and described The installation top plate 20 is fixedly connected to the tops of the front support plate 4 and the rear support plate 10 , and the installation top plate 20 and the installation bottom plate 7 are parallel to each other.

The rail pair simulation module includes a rail sample mounting plate 6, a slider sample mounting plate 11 and a first screw transmission mechanism, and the first screw transmission mechanism includes balls fixed in the slider sample mounting plate 11 Lead screw nut 25 and the ball screw 5 that is connected with it, described ball screw 5 is parallel with guide rail sample 8, and is supported by described front support plate 4 and described rear support plate 10, and described ball screw 5 is supported by Driven by a main motor, the main motor is fixed on the installation base plate 7 . The guide rail sample mounting plate 6 is located below the slider sample mounting plate 11 and is fixed on the mounting bottom plate 7 .

Described load applying module comprises load loading spring 15, load adjustment leading screw 13, load adjustment nut 14, load measurement sensor 22, load measurement sensor mounting plate 23, support guide rail 19, support guide rail slider, front thrust plate 24 and rear Thrust plate 21, the load adjustment screw 13 is vertically fixed above the slider sample mounting plate 11, the load adjustment nut 14 is connected to the load adjustment screw 13, the load adjustment screw The top of 13 is provided with the top plate that coaxially slides with it, and described load measurement sensor 22 is pressed on described top plate, and described load measurement sensor 22 is installed on the described load measurement sensor mounting plate 23, and described load measurement sensor is installed The plate 23 is fixed on the support guide rail slider, and the support guide rail slider is slidably matched with the support guide rail 19, and the support guide rail 19 is fixed on the installation top plate 20 and is parallel to the ball screw 5 , the load loading spring 15 is clamped between the top plate and the load adjusting nut 14, the load loading spring 15 is sleeved on the load adjusting screw 13, and the mounting plate of the load measuring sensor 22 is set There is a front thrust plate 24 and a rear thrust plate 21, and the front thrust plate 24 and the rear thrust plate 21 are fixedly connected to the slider sample mounting plate 11 respectively.

The straightness measurement module includes a digital dial indicator 16, an auxiliary motor and a second screw transmission mechanism, and the second screw transmission mechanism is installed on the front thrust plate 24, and the digital dial indicator 16 is similar to the guide rail. The member 8 is vertical and fixedly connected with the lead screw nut of the second screw transmission mechanism, and the lead screw 17 of the second screw transmission mechanism is driven by the auxiliary motor.

The friction measurement module is composed of a tension pressure sensor 12 , one end of the tension pressure sensor 12 is fixed on the slider sample mounting plate 11 , and the other end is fixed on the ball screw nut 25 .

As shown in FIG. 5 , the control system of the guide rail wear accuracy test bench of the present invention includes an upper computer 101 and a lower computer 102 composed of a single-chip microcomputer that communicates with the upper computer 101 through a serial port. In this embodiment, the upper computer 101 is a computer, and the lower computer 102 can be a single-chip microcomputer model STC5A60S2, or a single-chip computer model STC12C5A60S2, or a single-chip computer model PIC16F877, or a single-chip computer model CORE8051.

The signal input end of the lower computer 102 is respectively connected to the signal output end of the friction sensor 103 for detecting the friction force of the guide rail, the load sensor 104 for detecting the load of the guide rail, and the straightness sensor 105 for detecting the straightness of the guide rail The signal output terminals of the lower computer 102 are respectively connected to the main motor driver 106 for driving the main motor 107 of the tested guide rail to work, and the auxiliary motor driver 108 for driving the auxiliary motor 109 for driving the straightness sensor 105 to move .

In this embodiment, the main motor 107 is a servo motor, and the main motor driver 106 is provided with the servo motor. With its high-precision speed servo characteristics and high positioning accuracy, the servo motor makes the guide rail wear accuracy test bench system have the characteristics of large speed adjustment range and high operation accuracy.

In this embodiment, the auxiliary motor 109 is a stepping motor, and the auxiliary motor driver 108 is provided with the stepping motor. The stepper motor has the characteristics of fast response speed and high repeat positioning accuracy.

The friction sensor 103 is composed of a tension and pressure sensor installed in the rail wear accuracy test bench. The friction sensor 103 measures the friction force between the test samples on the test bench in real time, and sends the measurement result to the lower computer 102 in the form of analog quantity.

The load sensor 104 is composed of a load measuring sensor arranged in the load applying module of the guide rail wear accuracy test bench. The load sensor 104 measures the load between the test pieces of the test bench in real time, and sends the measurement result to the lower computer 102 in the form of analog quantity.

The straightness sensor 105 is composed of a digital dial indicator arranged in the straightness measurement module of the guide rail wear accuracy test bench. The action of the straightness sensor 105 is driven by the auxiliary motor to realize the contact and separation with the measurement object, and send the measurement result to the lower computer 102 in the form of digital quantity.

The working process of the guide rail wear precision test bench control system of the present invention is as follows:

The guide rail sample and the slider sample are installed on the guide rail wear accuracy test bench and the guide rail wear accuracy test bench is started to run. The lower computer obtains the relevant parameters of the current operation of the test bench through the friction sensor, load sensor and straightness sensor, and The relevant parameters of the current operation of the obtained test bench are sent to the upper computer through the serial port, and the upper computer sends a control signal to the lower computer according to the received relevant parameters of the current operation, and the lower computer receives the upper computer through the serial port. According to the control signal of the upper computer, by adjusting the control parameters of the main motor, the relative motion state between the guide rail sample and the slider sample is changed, and by adjusting the control parameters of the auxiliary motor, the straightness sensor and the guide rail are controlled. Whether the sample is in contact or not. The upper computer displays the current operating parameters of the test bench in real time.

Claims (6)

1. a way rub accuracy testing bench control system, it is characterized in that, the slave computer (102) that includes host computer (101) and communicate by serial ports with host computer (101), the signal input part of described slave computer (102) connects respectively the friction force sensor (103) for detection of rail friction power, for detection of the load transducer (104) of guide rail load capacity and for detection of the signal output part of the linearity sensor (105) of guide rail linearity, the signal output part of described slave computer (102) connects respectively the main motor driver (106) of main motor (107) work for driving tested guide rail operation, and for driving the auxiliary-motor driver (108) of mobile auxiliary-motor (109) work of linearity sensor (105).

2. way rub accuracy testing bench control system according to claim 1, is characterized in that, described main motor (107) adopts servomotor.

3. way rub accuracy testing bench control system according to claim 1, is characterized in that, described auxiliary-motor (109) adopts stepper motor.

4. way rub accuracy testing bench control system according to claim 1, it is characterized in that, described friction force sensor (103) is to be made up of the pull pressure sensor being arranged in way rub accuracy testing platform, and described friction force sensor (103) is delivered to slave computer (102) by measurement result with the form of analog quantity.

5. way rub accuracy testing bench control system according to claim 1, it is characterized in that, described load transducer (104) is to be made up of the load measuring cell being arranged in the described load applying module of way rub accuracy testing platform, and described load transducer (104) is delivered to slave computer (102) by measurement result with the form of analog quantity.

6. way rub accuracy testing bench control system according to claim 1, it is characterized in that, described linearity sensor (105) is to be made up of the digital dial gauge being arranged in the straight line degree measurement module of way rub accuracy testing platform, and described linearity sensor (105) is delivered to slave computer (102) by measurement result with the form of digital quantity.

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