A steam turbine cylinder expansion displacement sensor calibration device

Abstract

The present invention belongs to the technical field of turbine status monitoring, and specifically relates to a turbine cylinder expansion displacement sensor calibration device. Two pads are fixed on one end of the base plate respectively, a mounting plate is fixed on the two pads, a right support plate is fixed on the other end of the base plate, and a left support plate is fixed on the base plate and parallel to the right support plate; the measuring chute and the guide chute are fixed between the left support plate and the right support plate in parallel, a handwheel is fixed on one end of the screw, the screw is fixed on the right support plate, and the other end of the screw is fixed on the slider, the screw passes through the cover plate, and the cover plate is fixed on the right support plate; the slider is installed between the measuring chute and the guide chute, and the slider can be moved between the measuring chute and the guide chute by rotating the handwheel; one end of the optical axis passes through the left support plate and is fixed on the slider, and the other end of the optical axis is fixed to the transition sleeve. It effectively solves the problem that the original calibration method is cumbersome to operate and the accuracy cannot meet the requirements, and greatly improves the work efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of steam turbine state monitoring, and in particular relates to a steam turbine cylinder expansion displacement sensor calibration device. Background Art

[0002] The steam turbine cylinder expansion displacement measuring instrument is involved in the protection tripping of the steam turbine. The characteristics of this sensor are high resolution, small hysteresis and compact structure in the entire measurement range. It senses the change of distance by moving the ferromagnetic core in the sensor. The structure is special and it involves the protection of the steam turbine. Each overhaul cycle needs to be sent to a professional institution for calibration.

[0003] At present, the common practice for calibrating turbine cylinder displacement sensors in China is to use a vernier caliper and an auxiliary fixing device. This method has the following shortcomings: 1) The measurement is not accurate because the vernier caliper is fixed to the ferromagnetic core and the vernier caliper is moved. Since the instrument accuracy requirement is 2% of the range, the error caused by this method is large, and the sensor cannot be accurately calibrated; 2) Due to the moving magnetic core, the calibration process cannot guarantee the linearity of the movement; 3) The tight connection between the caliper and the iron core cannot be guaranteed; 4) The calibration time and workload are large.

[0004] In view of this situation, it is necessary to develop a special set of turbine cylinder expansion displacement sensor calibration equipment. Summary of the invention

[0005] There are many problems in the existing calibration of steam turbine cylinder expansion displacement measurement sensors. First, the calibration accuracy cannot be guaranteed and the error is large. At the same time, the calibration steps are cumbersome, the calibration time and workload are large, and it is impossible to calibrate on site. Based on this, the purpose of the present invention is to provide a calibration device for steam turbine cylinder expansion displacement sensor, which can verify the accuracy of probe measurement by simulating the movement of cylinder expansion, and fundamentally eliminate the problem of large measurement error caused by poor probe linearity during unit operation.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A device for calibrating a cylinder expansion displacement sensor for a steam turbine comprises a base plate, a left support plate, a right support plate, a cover plate, a measuring chute, a guide chute, a pad, a slider, a screw, a handwheel, an optical axis, a mounting plate and a transition sleeve; two pads are respectively fixed at one end of the base plate, the mounting plate is fixed on the two pads, the right support plate is fixed at the other end of the base plate, the left support plate is fixed on the base plate and is parallel to the right support plate; the measuring chute and the guide chute are fixed between the left support plate and the right support plate in parallel, the handwheel is fixed at one end of the screw, the screw is fixed on the right support plate, the other end of the screw is fixed on the slider, the screw passes through the cover plate, and the cover plate is fixed on the right support plate; the slider is installed between the measuring chute and the guide chute, and the slider can be moved between the measuring chute and the guide chute by rotating the handwheel; one end of the optical axis passes through the left support plate and is fixed on the slider, and the other end of the optical axis is fixed to the transition sleeve.

[0008] The two cushion blocks are respectively fixed to one end of the bottom plate by screws.

[0009] The mounting plate is fixed on the two pads by screws.

[0010] The right supporting plate is fixed to the other end of the bottom plate by screws.

[0011] A measuring ruler is installed on the measuring chute.

[0012] The cover plate is fixed on the right supporting plate by screws.

[0013] One end of the optical axis passes through the left supporting plate and is fixed on the sliding block by means of screws.

[0014] The transition sleeve is provided with a screw hole, and the movable ferromagnetic core of the sensor is fixed in the screw hole.

[0015] The beneficial effects achieved by the present invention are:

[0016] The present invention can verify the static characteristics, linear characteristics and corresponding card characteristics of the sensor, effectively solve the problem that the original verification method is cumbersome to operate and the accuracy cannot meet the requirements, and greatly improves the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the structural diagram of the turbine cylinder expansion displacement sensor calibration device;

[0018] In the figure: 1. Base plate; 2. Left support plate; 3. Right support plate; 4. Cover plate; 5. Measuring slide; 6. Guide slide; 7. Pad; 8. Slider; 9. Screw; 10. Handwheel; 11. Optical axis; 12. Mounting plate; 13. Transition sleeve. DETAILED DESCRIPTION

[0019] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1 As shown, the present invention comprises a bottom plate 1, a left support plate 2, a right support plate 3, a cover plate 4, a measuring slide 5, a guide slide 6, a cushion block 7, a slider 8, a screw 9, a hand wheel 10, an optical axis 11, a mounting plate 12, and a transition sleeve 13. The sensor and the sensor moving ferromagnetic core do not belong to the invention.

[0021] This device consists of two parts, the sensor fixing bracket and the measuring device. The specific structure is as follows:

[0022] Fixed bracket: used to fix the turbine cylinder expansion displacement sensor, consisting of two pads 7, a mounting plate 12 and a base plate 1.

[0023] The measuring device is composed of a left supporting plate 2, a right supporting plate 3, a cover plate 4, a measuring slide 5, a guide slide 6, a slide block 8, a screw rod 9, a hand wheel 10, an optical axis 11, a mounting plate 12, and a transition sleeve 13.

[0024] The connection relationship between each part is as follows:

[0025] The two cushion blocks 7 are fixed to one end of the bottom plate 1 by screws respectively.

[0026] The mounting plate 12 is fixed on the two pads 7 by screws to fix the sensor.

[0027] The right supporting plate 3 is fixed to the other end of the bottom plate 1 by screws, and the left supporting plate 2 is fixed on the bottom plate 1 and is parallel to the right supporting plate 3 .

[0028] The measuring chute 5 and the guiding chute 6 are fixed in parallel between the left support plate 2 and the right support plate 3, wherein the guiding chute 6 guides left and right, and a measuring ruler is installed on the measuring chute 5 for measuring and guiding.

[0029] The hand wheel 10 is fixed to one end of the screw rod 9, and the screw rod 9 is fixed to the right support plate 3. The other end of the screw rod 9 is fixed to the slider 8. The screw rod 9 passes through the cover plate 4, and the cover plate 4 is fixed to the right support plate 3 by screws.

[0030] The slide block 8 is installed between the measuring slide groove 5 and the guide slide groove 6 , and the slide block 8 can be moved between the measuring slide groove 5 and the guide slide groove 6 by rotating the hand wheel 10 .

[0031] One end of the optical axis 11 passes through the left support plate 2 and is fixed to the slider 8 by means of screws, and the other end of the optical axis 11 is fixed to the transition sleeve 13 .

[0032] The transition sleeve 13 is provided with an M3 screw hole, in which the movable ferromagnetic core of the sensor is fixed.

[0033] When in use, the sensor to be calibrated is fixed on the mounting plate 12, and the moving ferromagnetic core of the sensor is fixed on the transition sleeve 13. Power is supplied to the sensor, and the hand wheel 10 is rotated to move the slider 8 in the measuring slot 5 and the guide slot 6, thereby driving the optical axis 11 to move, and the sensor measuring ferromagnetic core will move in the sensor. According to the indication of the measuring slot 5, the sensor can be calibrated by recording the test data at each fixed interval (for example, 5mm).

Claims

1. A steam turbine cylinder expansion displacement sensor calibration device, characterized in that: It includes a base plate, a left support plate, a right support plate, a cover plate, a measuring slide, a guide slide, a pad, a slider, a screw, a handwheel, an optical axis, a mounting plate, and a transition sleeve; two pads are respectively fixed at one end of the base plate, the mounting plate is fixed on the two pads, the right support plate is fixed at the other end of the base plate, the left support plate is fixed on the base plate, and is parallel to the right support plate; the measuring slide and the guide slide are fixed between the left support plate and the right support plate in parallel, the handwheel is fixed at one end of the screw, the screw is fixed on the right support plate, the other end of the screw is fixed on the slider, the screw passes through the cover plate, and the cover plate is fixed on the right support plate; the slider is installed between the measuring slide and the guide slide, and the slider can be moved between the measuring slide and the guide slide by rotating the handwheel; one end of the optical axis passes through the left support plate and is fixed on the slider, and the other end of the optical axis is fixed on the transition sleeve; one end of the optical axis passes through the left support plate and is fixed to the slider by a screw; the transition sleeve is provided with a screw hole, and the movable ferromagnetic core of the sensor is fixed in the screw hole.

2. The steam turbine cylinder expansion displacement sensor calibration device according to claim 1 is characterized in that: The two cushion blocks are respectively fixed to one end of the bottom plate by screws.

3. The steam turbine cylinder expansion displacement sensor calibration device according to claim 1 is characterized in that: The mounting plate is fixed on the two pads by screws.

4. The steam turbine cylinder expansion displacement sensor calibration device according to claim 1 is characterized in that: The right supporting plate is fixed to the other end of the bottom plate by screws.

5. The steam turbine cylinder expansion displacement sensor calibration device according to claim 1 is characterized in that: A measuring ruler is installed on the measuring chute.

6. The steam turbine cylinder expansion displacement sensor calibration device according to claim 1, characterized in that: The cover plate is fixed on the right supporting plate by screws.

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