CN203464923U - Device for automatically detecting precision of size of bearing - Google Patents

Abstract

The utility model discloses an automatic detection device for bearing dimension precision. Bearing measuring instruments cannot meet the inspection requirements of mass production. The roundness measuring mechanism in the utility model comprises a roundness measuring servo motor, a roundness measuring ball screw, a roundness measuring slider, a knob, an upper roundness measuring claw, a lower roundness measuring claw and a roundness measuring sensor; The mechanism includes a flatness measurement servo motor, a flatness measurement ball screw, a fixture flange, a flatness measurement slideway, a flatness measurement slider, and a flatness measurement sensor; the inner and outer diameter and taper measurement mechanisms include bearing fixtures, the first The second and third servo motors for inner and outer diameter and taper measurement, the first ball screw for inner and outer diameter and taper measurement, the second ball screw for inner and outer diameter and taper measurement, ejector rod, slider for inner and outer diameter and taper measurement, carriage, and the third Internal and external diameter and taper measurement of ball screw, stepper motor and stylus. The utility model can realize the fully automatic on-site on-line measurement of the bearing.

Description

Bearing Dimensional Accuracy Automatic Testing Device

technical field

The utility model belongs to the technical field of testing and relates to a bearing detection device, in particular to an automatic detection device for bearing dimension precision.

Background technique

With the gradual increase of the output of my country's bearing manufacturing industry, the requirements for the geometric dimension accuracy of bearings, especially the inner diameter, outer diameter, roundness and flatness, are getting higher and higher. Evaluating bearing geometric dimension accuracy is one of the most important methods to distinguish the quality of bearing performance. At present, my country's national standard GB and the machinery industry standard JB have revised the evaluation criteria for the dimensional accuracy of bearings. In the bearing industry, torsion spring dial gauges and bearing measuring instruments for testing bearing inner diameter, outer diameter, taper, roundness or flatness have been widely used, but torsion spring dial gauges need to be manually measured one by one, and the measurement accuracy Low, slow measurement efficiency. Although the bearing measuring instrument has high measurement accuracy, it is only suitable for laboratory use and cannot meet the testing requirements of mass production.

In recent years, the gradual maturity of real-time online inspection technology has promoted the development of bearing online inspection system, and the corresponding bearing automatic inspection system for bearing production line has also become a research hotspot. Existing studies have shown that the bearing automatic inspection system has faster efficiency and higher precision than the traditional dial gauge manual inspection, and has a huge market potential. Foreign research in this area is earlier, but it is still in the laboratory stage, and domestic research has just started. Therefore, there is an urgent need for a multi-functional automatic detection that can detect the inner diameter, outer diameter, taper, roundness and flatness of the bearing. system.

Contents of the invention

The purpose of this utility model is to provide an automatic detection device for bearing dimensional accuracy, which can realize fully automatic on-site on-line measurement of bearing roundness, flatness, inner diameter, outer diameter and taper.

The utility model comprises a detection chamber body, a conveyor belt, a roundness measuring mechanism, a flatness measuring mechanism, and an inner and outer diameter and taper measuring mechanism.

The bottom of the detection chamber of the detection chamber body is provided with a conveyor belt, and the drive motor drives the conveyor belt through a pulley. The two roundness measuring mechanisms, the flatness measuring mechanism and the inner and outer diameter and taper measuring mechanisms are integrally set in the detection chamber of the detection chamber body; the two roundness measuring mechanisms are symmetrically arranged on both sides of the conveyor belt, and the flatness measuring mechanism and the inner and outer diameters Diameter and taper measuring mechanism are set on the top of the conveyor belt.

The roundness measuring mechanism includes a roundness measuring servo motor, a roundness measuring ball screw, a roundness measuring slider, a knob, an upper roundness measuring claw, a lower roundness measuring claw and a roundness measuring sensor; two roundness measuring The measuring servo motor is arranged symmetrically in the two side walls of the detecting chamber of the detecting chamber body. The main shaft of each roundness measuring servo motor is threadedly connected with a roundness measuring ball screw and a roundness measuring screw nut respectively. One end of the roundness measurement lead screw nut is fixedly connected with one end of a roundness measurement slider, and the bottom of each roundness measurement slider is slidingly connected with the bottom of the detection chamber of the detection chamber body; the other end of each roundness measurement slider is The knob is screwed to one end of the upper roundness measuring jaw and one end of the lower roundness measuring jaw; the angle between the upper roundness measuring jaw and the lower rounding measuring jaw is 60°, and the other end of the upper roundness measuring jaw and The other end of the lower roundness measuring jaw is threadedly connected with a roundness measuring sensor; each roundness measuring sensor is set vertically with the side of the corresponding upper roundness measuring jaw or lower roundness measuring jaw, and the probe ends are all facing inward Side setup, all roundness measuring sensors are on the same level.

The flatness measurement mechanism includes a flatness measurement servo motor, a flatness measurement ball screw, a fixture flange, a flatness measurement slideway, a flatness measurement slider and a flatness measurement sensor; the flatness measurement servo motor is fixedly arranged on On the top of the detection chamber of the detection chamber body, the spindle is threaded with the flatness measurement screw nut through the flatness measurement ball screw, and the bottom end of the flatness measurement screw nut is fixedly connected with the top end of the fixture flange; the bottom end of the fixture flange Three flatness measuring slideways are fixedly arranged in the radial direction, and a flatness measuring slide block is arranged in each flatness measuring slideway, and the bottom end of each flatness measuring slide block is threadedly connected with the top end of a flatness measuring sensor; The bottom ends of the three flatness measuring sensors are arranged on the same horizontal plane, and the distance between the central axis of each flatness measuring sensor and the central axis of the fixture flange is equal.

The inner and outer diameter and taper measurement mechanism includes a bearing fixture, a first inner and outer diameter and taper measurement servo motor, a first inner and outer diameter and taper measurement ball screw, a second inner and outer diameter and taper measurement servo motor, a second inner and outer diameter and taper measurement Measuring ball screw, ejector rod, inner and outer diameter and taper measuring slider, carriage, third inner and outer diameter and taper measuring ball screw, third inner and outer diameter and taper measuring servo motor, stepping motor and probe needle; bearing fixture It is arranged at the bottom of the detection chamber of the detection chamber body; two first inner and outer diameter and taper measurement servo motors are respectively fixedly arranged in the two side walls of the detection chamber of the detection chamber body, and the main shaft of each first inner and outer diameter and taper measurement servo motor passes through A first inner and outer diameter and taper measuring ball screw is threadedly connected with a first inner and outer diameter and taper measuring screw nut, and the top end of each first inner and outer diameter and taper measuring screw nut is connected with a second inner and outer diameter and taper measuring screw nut. The bottom end of the servo motor is fixedly connected; each second inner and outer diameter and taper measurement servo motor is arranged in the two side walls of the detection chamber of the detection chamber body, and the main shaft passes through a second inner and outer diameter and taper measurement ball screw and a second The inner and outer diameter and taper measurement lead screw nuts are threadedly connected, and each second inner and outer diameter and taper measurement lead screw nut is fixedly connected with one end of an inner and outer diameter and taper measurement slider through a push rod, and two inner and outer diameter and taper measurement sliders It is symmetrically arranged in the horizontal chute opened at the bottom of the carriage; the carriage is threadedly connected with the third ball screw for measuring inner and outer diameter and taper through the screw nut for measuring the third inner and outer diameter and taper, and the third ball screw for measuring the third inner and outer diameter and taper The top of the top is fixedly connected with the main shaft of the third inner and outer diameter and taper measurement servo motor, and the third inner and outer diameter and taper measurement servo motor is fixedly arranged on the top of the detection chamber of the detection chamber body; the bottom of each inner and outer diameter and taper measurement slider is fixedly arranged with A stepping motor, the main shaft of each stepping motor is fixedly connected to the top of a probe pin, and a probe is set on the bottom side of each probe pin, and the probes of the two probe pins are set on the same horizontal plane , and the rotation angles of the two probe pins differ by 180°.

The beneficial effects of the utility model:

The utility model integrates multiple functions, can realize fully automatic measurement of bearing roundness, flatness, inner diameter, outer diameter and taper, and can be seamlessly connected with the bearing production line. The traditional manual measurement method mainly has the disadvantages of poor accuracy of detection data and low detection efficiency. Compared with the traditional manual torsion spring dial indicator measurement method and the measurement method of the laboratory measuring instrument, the utility model realizes automatic measurement from the measurement method, greatly improves the consistency and repeatability of the detection data, and removes human factors It has a huge impact on the measurement results, that is, it improves the accuracy of the detection data; from the measurement efficiency, it realizes multi-station step-by-step measurement, effectively improves the detection efficiency, and can better meet the requirements of modern enterprises for bearing production.

Description of drawings

Fig. 1 is the overall structural representation of the utility model;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is the perspective view of the roundness measuring mechanism in the utility model;

Fig. 4 is the structural representation of flatness measuring mechanism in the utility model;

Fig. 5 is a perspective view of the inner and outer diameter and taper measuring mechanism of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Figures 1 and 2, the automatic detection device for bearing dimensional accuracy includes a detection chamber body 1, a conveyor belt 2, a roundness measurement mechanism 3, a flatness measurement mechanism 4, and an inner and outer diameter and taper measurement mechanism 5.

The bottom of the detection chamber body 1 is provided with a conveyor belt 2, and the driving motor drives the conveyor belt 2 through a pulley. The two roundness measuring mechanisms 3, the flatness measuring mechanism 4 and the inner and outer diameter and taper measuring mechanisms 5 are integrally arranged in the detection chamber of the detection chamber body 1; the two roundness measuring mechanisms 3 are symmetrically arranged on both sides of the conveyor belt 2, The flatness measuring mechanism 4 and the internal and external diameter and taper measuring mechanism 5 are all arranged on the top of the conveyor belt 2 .

As shown in Figures 2 and 3, the roundness measuring mechanism 3 includes a roundness measuring servo motor 3-1, a roundness measuring ball screw 3-2, a roundness measuring slider 3-3, a knob 3-4, an upper roundness measuring Measuring jaw 3-5, lower roundness measuring jaw 3-6 and roundness measuring sensor 3-7; two roundness measuring servo motors 3-1 are symmetrically arranged in the two side walls of the detection chamber of the detection chamber body 1, each The main shaft of the roundness measurement servo motor 3-1 is threadedly connected with a roundness measurement lead screw nut through a roundness measurement ball screw 3-2 respectively, and one end of each roundness measurement lead screw nut is connected with a roundness measurement slide One end of the block 3-3 is fixedly connected, and the bottom of each roundness measurement slider 3-3 is slidingly connected with the bottom of the detection chamber of the detection chamber body 1; the other end of each roundness measurement slider 3-3 is connected through the knob 3 -4 is threadedly connected with one end of the upper roundness measuring jaw 3-5 and one end of the lower roundness measuring jaw 3-6; the angle between the upper roundness measuring jaw 3-5 and the lower roundness measuring jaw 3-6 is 60°, the other end of the upper roundness measuring jaw 3-5 and the other end of the lower roundness measuring jaw 3-6 are threadedly connected with a roundness measuring sensor 3-7; each roundness measuring sensor 3-7 is connected with the corresponding The sides of the upper roundness measuring jaw or the lower roundness measuring jaw are set vertically, and the end of the measuring head is set towards the inner side, and all the roundness measuring sensors 3-7 are located on the same horizontal plane.

As shown in Figures 1 and 4, the flatness measurement mechanism 4 includes a flatness measurement servo motor 4-1, a flatness measurement ball screw 4-2, a fixture flange 4-3, a flatness measurement slideway 4-4, and a flatness measurement slideway 4-4. The flatness measurement slide block 4-5 and the flatness measurement sensor 4-6; the flatness measurement servo motor 4-1 is fixedly arranged on the top of the detection cavity of the detection cavity body 1, and the main shaft is connected with the flatness measurement ball screw 4-2 by the flatness measurement. The measuring lead screw nut is threadedly connected, and the bottom end of the flatness measuring lead screw nut is fixedly connected with the top end of the fixture flange 4-3; the bottom end of the fixture flange 4-3 is fixedly provided with three flatness measuring slideways 4 along the radial direction -4, each flatness measurement slideway 4-4 is provided with a flatness measurement slider 4-5, the bottom end of each flatness measurement slider 4-5 is connected with the top end of a flatness measurement sensor 4-6 Threaded connection; the bottom ends of the three flatness measuring sensors 4-6 are arranged on the same horizontal plane, and the distance between the central axis of each flatness measuring sensor 4-6 and the central axis of the fixture flange 4-3 is equal.

As shown in Figures 1 and 5, the inner and outer diameter and taper measurement mechanism 5 includes a bearing fixture 5-1, a first inner and outer diameter and taper measurement servo motor 5-2, a first inner and outer diameter and taper measurement ball screw 5-3, and a first inner and outer diameter and taper measurement ball screw 5-3. Second inner and outer diameter and taper measurement servo motor 5-4, second inner and outer diameter and taper measurement ball screw 5-5, ejector rod 5-6, inner and outer diameter and taper measurement slider 5-7, carriage 5-8, the second Three internal and external diameters and taper measurement ball screw 5-9, the third internal and external diameter and taper measurement servo motor 5-10, stepper motor 5-11 and probe needle 5-12; bearing fixture 5-1 is arranged on the detection chamber body 1 at the bottom of the detection chamber; two first inner and outer diameter and taper measurement servo motors 5-2 are respectively fixedly arranged in the two side walls of the detection chamber body 1 of the detection chamber, and each first inner and outer diameter and taper measurement servo motor 5-2 The main shaft of the first internal and external diameter and taper measurement ball screw 5-3 is threadedly connected with a first internal and external diameter and taper measurement screw nut, and the top of each first internal and external diameter and taper measurement screw nut is connected with a first The bottom ends of the second internal and external diameter and taper measurement servo motors 5-4 are fixedly connected; each second internal and external diameter and taper measurement servo motors 5-4 are arranged in the two side walls of the detection cavity of the detection cavity body 1, and the main shaft passes through a first Two internal and external diameters and taper measurement ball screw 5-5 are threadedly connected with a second internal and external diameter and taper measurement screw nut, and each second internal and external diameter and taper measurement screw nut is connected to an internal and external diameter by a push rod 5-6 and one end of the taper measurement slider 5-7 is fixedly connected, and two inner and outer diameters and the taper measurement slider 5-7 are symmetrically arranged in the horizontal chute provided at the bottom of the carriage 5-8; the carriage 5-8 passes through the third inner and outer The diameter and taper measurement lead screw nut is threadedly connected with the third inner and outer diameter and taper measurement ball screw 5-9, and the top of the third inner and outer diameter and taper measurement ball screw 5-9 is connected with the third inner and outer diameter and taper measurement servo motor 5 The main shaft of -10 is fixedly connected, and the third inner and outer diameter and taper measurement servo motor 5-10 is fixedly arranged on the top of the detection chamber body 1; each inner and outer diameter and taper measurement slider 5-7 bottom is fixedly provided with a stepper Motor 5-11, the main shaft of each stepper motor 5-11 is fixedly connected with the top of a probe pin 5-12, and the bottom end side of each probe pin 5-12 is provided with a measuring head, two measuring probes The probes of the probe pins 5-12 are arranged on the same horizontal plane, and the rotation angles of the two probe pins 5-12 differ by 180°.

The preparatory calibration work before the automatic detection device for bearing dimension accuracy works. Before the roundness measurement, adjust the roundness measurement sensor 3-7 to a suitable length according to the outer diameter of the bearing to be tested, and then select a standard test block with the same outer diameter as the bearing for roundness calibration and zeroing. Adjust the distance between the flatness measurement sensor 4-6 and the center of the fixture flange 4-3 according to the size of the outer ring of the tested bearing before flatness measurement, and ensure the distance between the three flatness measurement sensors 4-6 and the center of the fixture flange 4-3 The distances are equal, and then select a flat standard test block for flatness calibration and zeroing. Before measuring inner and outer diameters and tapers, adjust the inner and outer diameters and taper measurement sliders 5-7 to contact and be symmetrical about the center of the conveyor belt 2. The first inner and outer diameters and taper measurement servo motor 5-2 cooperates with the third inner and outer diameter and taper measurement servo motor 5- 10 Stop the entire inner and outer diameter and taper measurement mechanism 5 above the conveyor belt 2, and then separate the two inner and outer diameter and taper measurement sliders 5-7 symmetrically through two second inner and outer diameter and taper measurement servo motors 5-4, and select The standard test block with the same inner and outer diameter as the tested bearing is used for roundness calibration and zero reset.

Movement method for roundness measurement. The driving motor drives the conveyor belt 2 to drive through the pulley, and the conveyor belt 2 brings the tested bearing into the roundness measurement area, and the roundness measurement servo motor 3-1 pushes the roundness measurement slider 3-3 to approach the center of the conveyor belt 2 until A roundness measuring sensor 3-7 touches the outer diameter of the bearing, stops pushing, and the computer records the feedback data of the four roundness measuring sensors 3-7, and converts the roundness of the tested bearing. The roundness measurement servo motor 3-1 resets the roundness measurement slide block 3-3, the conveyor belt 2 continues to drive, and the roundness measurement ends, waiting for the next bearing to be tested.

Movement method for flatness measurement. The conveyor belt 2 brings the tested bearing into the flatness measurement area. The flatness measurement servo motor 4-1 pushes the fixture flange 4-3 down until the three flatness measurement sensors 4-6 respectively touch the end face of the bearing to be tested, and the computer records the feedback data of the flatness measurement sensors 4-6, and converts the measured Measure bearing flatness data. The flatness measurement servo motor 4-1 resets the fixture flange 4-3, the conveyor belt 2 continues to drive, and the flatness measurement ends, waiting for the next bearing to be tested.

The movement mode of inner and outer diameter and taper measurement. The conveyor belt 2 brings the tested bearing into the inner and outer diameter and taper measurement area, and the bearing is clamped by the bearing fixture 5-1. The first inner and outer diameter and taper measurement servo motor 5-2 cooperates with the third inner and outer diameter and taper measurement servo motor 5- 10 Lower the probe needle 5-12 to the height of the bearing, and the two second inner and outer diameter and taper measurement servo motors 5-4 drive the two inner and outer diameter and taper measurement sliders 5-7 to move outward symmetrically to the inner diameter surface of the bearing Stop, the inner diameter measured by the stylus 5-12 is input into the computer; raise the stylus 5-12 to another point at the height of the bearing to measure the inner diameter again, input it into the computer, and the computer compares the measured inner diameter value to obtain the inner diameter taper; Raise the probe pin 5-12 above the bearing, the stepper motor 5-11 spindle rotates 180°, so that the probe on the probe pin 5-12 faces inward, and the two second inner and outer diameters and taper measurement servo motors 5- 4 Drive the two inner and outer diameter and taper measuring sliders 5-7 to move outward symmetrically to a position slightly larger than the outer diameter of the bearing, lower the probe pin 5-12 to the height of the bearing, and the two inner and outer diameter and taper measuring sliders 5-7 moves inward symmetrically to the outer diameter surface of the bearing and stops, and the outer diameter measured by the probe of the probe 5-12 is input into the computer; the probe 5-12 is raised to another point at the height of the bearing to measure again The outer diameter is input into the computer, and the computer compares the measured outer diameter value to obtain the outer diameter taper; raise the probe needle 5-12 above the bearing, and the two second inner and outer diameters and taper measuring servo motors 5-4 drive the two inner and outer diameters and taper Measure the slider 5-7 to make it contact and be symmetrical about the center of the conveyor belt 2, the bearing fixture 5-1 loosens the bearing, and the spindle of the stepping motor 5-11 rotates 180°, so that the probe on the probe pin 5-12 moves toward the In addition, the conveyor belt continues to drive, the inner and outer diameters and taper measurements are completed, and the next bearing to be tested is waiting.

Claims (1)

1. An automatic detection device for bearing dimensional accuracy, including a detection chamber body, a conveyor belt, a roundness measurement mechanism, a flatness measurement mechanism, and an inner and outer diameter and taper measurement mechanism, characterized in that: The bottom of the detection chamber of the detection chamber body is provided with a conveyor belt, and the drive motor drives the conveyor belt through a pulley; two roundness measurement mechanisms, flatness measurement mechanisms, and inner and outer diameter and taper measurement mechanisms are integrally arranged in the detection chamber of the detection chamber body Inside; two roundness measuring mechanisms are symmetrically arranged on both sides of the conveyor belt, and the flatness measuring mechanism and the inner and outer diameter and taper measuring mechanisms are all set on the top of the conveyor belt; The roundness measuring mechanism includes a roundness measuring servo motor, a roundness measuring ball screw, a roundness measuring slider, a knob, an upper roundness measuring claw, a lower roundness measuring claw and a roundness measuring sensor; two roundness measuring The measuring servo motor is arranged symmetrically in the two side walls of the detecting chamber of the detecting chamber body. The main shaft of each roundness measuring servo motor is threadedly connected with a roundness measuring ball screw and a roundness measuring screw nut respectively. One end of the roundness measurement lead screw nut is fixedly connected with one end of a roundness measurement slider, and the bottom of each roundness measurement slider is slidingly connected with the bottom of the detection chamber of the detection chamber body; the other end of each roundness measurement slider is The knob is screwed to one end of the upper roundness measuring jaw and one end of the lower roundness measuring jaw; the angle between the upper roundness measuring jaw and the lower rounding measuring jaw is 60°, and the other end of the upper roundness measuring jaw and The other end of the lower roundness measuring jaw is threadedly connected with a roundness measuring sensor; each roundness measuring sensor is set vertically with the side of the corresponding upper roundness measuring jaw or lower roundness measuring jaw, and the probe ends are all facing inward Side setting, all roundness measuring sensors are located on the same horizontal plane; The flatness measurement mechanism includes a flatness measurement servo motor, a flatness measurement ball screw, a fixture flange, a flatness measurement slideway, a flatness measurement slider and a flatness measurement sensor; the flatness measurement servo motor is fixedly arranged on On the top of the detection chamber of the detection chamber body, the spindle is threaded with the flatness measurement screw nut through the flatness measurement ball screw, and the bottom end of the flatness measurement screw nut is fixedly connected with the top end of the fixture flange; the bottom end of the fixture flange Three flatness measuring slideways are fixedly arranged in the radial direction, and a flatness measuring slide block is arranged in each flatness measuring slideway, and the bottom end of each flatness measuring slide block is threadedly connected with the top end of a flatness measuring sensor; The bottom ends of the three flatness measuring sensors are arranged on the same horizontal plane, and the distance between the central axis of each flatness measuring sensor and the central axis of the fixture flange is equal; The inner and outer diameter and taper measurement mechanism includes a bearing fixture, a first inner and outer diameter and taper measurement servo motor, a first inner and outer diameter and taper measurement ball screw, a second inner and outer diameter and taper measurement servo motor, a second inner and outer diameter and taper measurement Measuring ball screw, ejector rod, inner and outer diameter and taper measuring slider, carriage, third inner and outer diameter and taper measuring ball screw, third inner and outer diameter and taper measuring servo motor, stepping motor and probe needle; bearing fixture It is arranged at the bottom of the detection chamber of the detection chamber body; two first inner and outer diameter and taper measurement servo motors are respectively fixedly arranged in the two side walls of the detection chamber of the detection chamber body, and the main shaft of each first inner and outer diameter and taper measurement servo motor passes through A first inner and outer diameter and taper measuring ball screw is threadedly connected with a first inner and outer diameter and taper measuring screw nut, and the top end of each first inner and outer diameter and taper measuring screw nut is connected with a second inner and outer diameter and taper measuring screw nut. The bottom end of the servo motor is fixedly connected; each second inner and outer diameter and taper measurement servo motor is arranged in the two side walls of the detection chamber of the detection chamber body, and the main shaft passes through a second inner and outer diameter and taper measurement ball screw and a second The inner and outer diameter and taper measurement lead screw nuts are threadedly connected, and each second inner and outer diameter and taper measurement lead screw nut is fixedly connected with one end of an inner and outer diameter and taper measurement slider through a push rod, and two inner and outer diameter and taper measurement sliders It is symmetrically arranged in the horizontal chute opened at the bottom of the carriage; the carriage is threadedly connected with the third ball screw for measuring inner and outer diameter and taper through the screw nut for measuring the third inner and outer diameter and taper, and the third ball screw for measuring the third inner and outer diameter and taper The top of the top is fixedly connected with the main shaft of the third inner and outer diameter and taper measurement servo motor, and the third inner and outer diameter and taper measurement servo motor is fixedly arranged on the top of the detection chamber of the detection chamber body; the bottom of each inner and outer diameter and taper measurement slider is fixedly arranged with A stepping motor, the main shaft of each stepping motor is fixedly connected to the top of a probe pin, and a probe is set on the bottom side of each probe pin, and the probes of the two probe pins are set on the same horizontal plane , and the rotation angles of the two probe pins differ by 180°.

Images