Electric switch mechanism detection equipment and detection method thereof

Abstract

The invention discloses switch mechanism detection equipment and a detection method thereof, and relates to the technical field of switch detection.The switch mechanism detection equipment comprises a bottom plate, a positioning clamp is arranged on the bottom plate, an X-direction measuring device is arranged on the right side of the positioning clamp, a Y-direction measuring device is arranged on the rear side of the positioning clamp, the front end of the X-direction measuring device is connected with a connecting rod, and the front end of the connecting rod is hinged to a product transverse connecting rod; hinge holes are formed in the left end of the connecting rod and the left end and the right end of the product transverse connecting rod. In the detection process, the rotation points of the two rocker arms on the electric switch mechanism and the restriction of the hinge points of the two rocker arm right reamed holes and the product transverse connecting rod form the movement of the four-connecting-rod mechanism, the X-direction detection device and the Y-direction detection device are matched, the vertical reference position of the rocker arms can be accurately found, and the detection accuracy is improved. Therefore, the limit screw position index and the switch switching displacement index of the switch mechanism can be accurately detected.

Description

Technical Field

[0001] The invention relates to the technical field of electric switch detection, in particular to an electric switch mechanism detection device and a detection method thereof. Background Art

[0002] The top of the TK-14A ejection double unlocking switch mechanism is equipped with a rocker arm and a limit screw (such as Figure 1 As shown in the figure, due to the use requirements, the precision requirements are very high. From the top view, there are: (1) Limit screw size requirements: The rocker arm is at a 90° vertical reference position (such as Figure 2 When the limit screw moves 8mm, a clearance of 0.5~1mm is required (as shown in Figure 3 (2) Switch action travel requirement: Starting from the 90° vertical reference position of the rocker arm, move within the range of 10.5±0.7mm, and the switch must be switched accurately (such as Figure 4 as shown).

[0003] It is difficult to meet the above-mentioned switch size requirements by using conventional detection devices and detection principles. According to conventional detection devices, an X-axis push rod and a Y-axis probe are arranged next to the product to be detected for detection. First, it is necessary to accurately define the product's initial reference - the vertical position of the rocker arm's swing centerline and the horizontal line, that is, to find the highest point of the rocker arm (such as Figure 5 As shown in the figure, however, due to the fact that the height direction of the rocker arm when it swings (hereinafter referred to as the y direction) changes less and less in the area close to verticality, such as ±1°. Figure 6 As shown in the figure, at ±1°, the change of △y is only 1 / 100 of the change of △x, that is, when △x changes by 0.35mm, the change of △y is only 0.0035mm, and at ±0.2°, the change of △y is only 1 / 570 of the change of △x. It can be seen that within the range of ±1°, even a displacement sensor with an accuracy of 0.5 microns cannot measure the change of △y.

[0004] Therefore, the error cannot be avoided by using the conventional detection device in the existing direct detection method, and even the high-precision displacement sensor cannot meet the detection accuracy requirements of the above-mentioned electric switch mechanism and electric switch mechanisms with similar accuracy requirements. Therefore, a new electric switch mechanism detection device is designed to use other detection principles and methods to meet the detection accuracy requirements. Summary of the invention

[0005] The present invention provides a switch mechanism detection device and a detection method thereof, the purpose of which is to solve the technical problem that the direct measurement method of the prior art proposed in the background art cannot meet the requirements of the TK-14A switch mechanism detection even if a high-precision sensor is used. The present invention provides the following technical solutions to achieve the above purpose: A switch mechanism detection device comprises a base plate, a positioning fixture is arranged on the base plate, an X-axis measuring device is arranged on the right side of the positioning fixture, and a Y-axis measuring device is arranged on the rear side, the front end of the X-axis measuring device is connected to a connecting rod, and the front end of the connecting rod is hinged to a product transverse connecting rod; the left end of the connecting rod and the left and right ends of the product transverse connecting rod are all provided with hinge holes.

[0006] In the aforementioned electric switch mechanism detection equipment, the X-axis measuring device is a servo motor linear motion mechanism, which includes a linear motor module, a servo moving seat is provided on the linear motor module, a horizontal floating mechanism is provided on the servo moving seat, an X-axis measuring rod is provided in the horizontal floating mechanism and toward the direction of the positioning fixture, and the X-axis measuring rod is connected to the rear end of the connecting rod.

[0007] In the aforementioned electric switch mechanism detection device, three proximity switches are arranged side by side on the linear motor module, the middle proximity switch is the origin switch, and the two left and right proximity switches are limit switches; a detection sheet is arranged on the front side of the servo moving seat.

[0008] In the aforementioned electric switch mechanism detection equipment, the Y-axis measuring device is a grating displacement detection mechanism, which includes a grating scale, a grating reader is arranged on the grating scale, a slide is arranged next to the grating reader, the slide is arranged on a fixed slide rail, a Y-axis measuring rod is arranged at the front end of the slide, and a spring shaft is arranged at the rear end of the slide, and the spring shaft uses spring force to push the slide and the Y-axis measuring rod forward.

[0009] In the aforementioned electric switch mechanism detection equipment, a detection wheel is arranged at the front end of the Y-axis measuring rod for transverse rotation.

[0010] In the aforementioned electric switch mechanism detection equipment, the positioning fixture includes a mounting seat, the top of the mounting seat is a positioning mounting plate, and the positioning mounting plate is provided with a positioning structure corresponding to the electric switch mechanism; the positioning fixture is provided with a clamping structure for clamping the electric switch mechanism.

[0011] In the aforementioned switch mechanism detection device, the positioning structure is a positioning pin corresponding to the positions of two diagonal screw holes on the switch mechanism mounting plate; the clamping structure is a clamping device arranged on the front side of the mounting seat.

[0012] In the aforementioned electric switch mechanism detection equipment, the measurement accuracy of the Y-axis measurement device is 5 μm; the measurement accuracy of the X-axis measurement device 3 is 50 μm.

[0013] A detection method for an electric switch mechanism detection device comprises the following steps: S1: placing the electric switch mechanism on the mounting seat through the positioning structure, and clamping and fixing the electric switch mechanism through the clamping structure; S2: Align the right reaming holes of the two rocker arms of the electric switch mechanism with the left and right hinge holes of the product's cross-link and constrain them through a pin; the distance between the two hinge points of the product's cross-link is the same as the distance between the rotation points of the two rocker arms. The two hinge points and the two rotation points have a total of four active points, and the product's cross-link and two right shift blocks form a four-bar linkage; the displacement value of the product's cross-link in the X direction is obtained by the X-axis measuring device, and the displacement value of the product's cross-link in the Y direction is obtained by the Y-axis measuring device; S3: Find the 90° vertical reference position of the rocker arm of the electric switch mechanism through the cooperation of the Y-axis measuring device, the X-axis measuring device, the connecting rod and the product cross connecting rod; S4: Move the rocker arm 8mm to the right from the 90° vertical reference position through the X-axis measuring device, and manually adjust the distance between the limit arm and the limit screw on the switch mechanism to 0.5~1mm; S5: Move the rocker arm from the 90° vertical reference position to the right to 10.5±0.7mm using the X-axis measuring device to detect whether the switch has been switched.

[0014] In the method for using the aforementioned switch mechanism detection device, in S3, the method for finding the 90° vertical reference position of the switch mechanism rocker arm is: First, the highest point A of the rocker arm with error is detected manually by direct measurement using a Y-axis measuring device; then, the rocker arm is pushed to the left by an X-axis measuring device and rotated counterclockwise by 20-30° to point B, and the height parameter Hy1 value is obtained by using the Y-axis measuring device; the rocker arm is then pulled to the right by the X-axis measuring device and rotated clockwise, and the height parameter Hy2 value is obtained by using the Y-axis measuring device. When Hy2=Hy1, point C is obtained, and the distance Ax between points BC is recorded. At this time, the highest point of the rocker arm in the y-axis is in the vertical direction of the midpoint of the Ax distance; finally, when the X-axis measuring device is used to push the rocker arm to rotate counterclockwise to the left to a distance of Ax / 2, point D is obtained. Point D is the highest point of the rocker arm in the y-axis, that is, the 90° vertical reference position of the rocker arm of the electric switch mechanism is found.

[0015] Compared with the prior art, the switch mechanism detection equipment provided by the present invention is combined with the designed indirect detection method to constrain the rotation points of the two rocker arms on the switch mechanism and the hinge points of the two rocker arm right reaming holes and the product cross-link during the detection process, forming the movement of a four-bar linkage. In conjunction with the X and Y direction detection devices, the present invention can accurately find the vertical reference position of the rocker arm, thereby accurately adjusting the limit screw position index of the switch mechanism and detecting the switch switching function. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a structural diagram of the ejection double unlocking switch mechanism to be tested (its structure includes a mounting plate, on which two main bodies are arranged, and the tops of the main bodies are each provided with a rocker arm and a limit screw; the rocker arm includes a left shift block located on the left, a right shift block located in the middle, and a limit arm located on the right; both the left shift block and the right shift block are provided with hinge holes at their ends, and the hinge hole of the right shift block is recorded as the right hinge hole of the rocker arm; a product cross connecting rod and a product connecting shaft are also provided thereon; the tension spring has been removed); Figure 2 The schematic diagram of the structure of the switch mechanism rocker arm at the 90° vertical reference position (top view); Figure 3 It is a structural diagram of the size requirements of the limit screw; Figure 4 It is a structural diagram of the switch action travel requirements; Figure 5 A schematic diagram showing a rocker arm at a 90° vertical reference position defined for a conventional (direct detection method) detection method; Figure 6 is the error diagram of △y variable; Figure 7 A schematic diagram of a rocker arm being located at a 90° vertical reference position is defined for the indirect detection method provided by the present invention; Figure 8 It is a schematic diagram of the detection principle of the present invention; Fig. 9 It is a structural schematic diagram of the present invention; Fig.10 It is a structural schematic diagram of the side-view direction positioning fixture; Fig.11 It is a schematic diagram of the structure of the present invention in a top view; Fig.12 for Fig.11 A magnified schematic diagram of the connection structure of the product's horizontal connecting rod, connecting rod, etc. Fig.13 It is a structural diagram of the proximity switch, the detection plate and the connection structure (the front mounting frame structure of the horizontal floating mechanism is omitted); Fig.14 Schematic diagram of the internal structure of the Y-axis measuring device (the grating cover outside the device is omitted); Reference numerals: 1-base plate, 2-positioning fixture, 3-X-axis measuring device, 4-Y-axis measuring device, 5-product horizontal connecting rod, 6-cabinet, 7-chassis, 8-lighting lamp, 9-product connecting shaft; 21-mounting seat, 22-clamping device; 31-servo moving seat, 32-horizontal floating mechanism, 33-X-axis measuring rod, 34-linear motor module, 35-proximity switch, 36-detection sheet; 41-Y-axis measuring rod, 42-detection head, 43-grating ruler, 44-grating reader, 45-slide, 46-slide rail, 47-spring shaft. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0018] Embodiment, a switch mechanism detection device, structure reference Figure 9-14 As shown, it includes a base plate 1, a positioning fixture 2 is provided on the base plate 1, an X-axis measuring device 3 is provided on the right side of the positioning fixture 2, and a Y-axis measuring device 4 is provided on the rear side, the front end of the X-axis measuring device 3 is connected to the product connecting shaft 9, and the front end of the product connecting shaft 9 is hinged to the product cross connecting rod 5; the left end of the connecting rod 4 and the left and right ends of the product cross connecting rod 5 are provided with hinge holes.

[0019] The X-axis measuring device 3 is a servo motor linear motion mechanism, which includes a linear motor module 34, a servo moving seat 31 is arranged on the linear motor module 34, a horizontal floating mechanism 32 is arranged on the servo moving seat 31, an X-axis measuring rod 33 is arranged in the horizontal floating mechanism 32 and in the direction of the positioning fixture 2, and the X-axis measuring rod 33 is connected to the rear end of the product connecting shaft 9. The linear motor module 34 (preferably the HX100 series) can drive the servo moving seat 31 to move back and forth in a straight line, and the X-axis displacement is controlled by the servo motor on the linear motor module 34 to achieve X-axis distance measurement. The horizontal floating mechanism 32 is provided with a linear bearing and a sliding shaft to obtain flexible movement up and down, that is, it can flexibly move in a plane with the product cross connecting rod to meet the movement requirements of the product mechanism.

[0020] Three proximity switches 35 are arranged side by side on the linear motor module 34, the middle proximity switch 35 is the origin switch, and the two left and right proximity switches 35 are limit switches; a detection piece 36 is arranged on the front side of the servo moving seat 31. During the movement of the servo moving seat 31, the detection piece 36 follows the movement, and the detection piece 36 cooperates with the proximity switch 35. When the detection piece 36 passes the proximity switch 35, the switch is triggered. The rocker arm moves 8mm to the right from the 90° vertical reference position, and the middle origin switch is turned on and stopped. Here, the limit screw gap is adjusted to meet the 0.5~1mm requirement. The function of the left and right limit switches is to avoid overtravel and effectively protect the product; that is, the X displacement can only be limited to move within the left and right limit switches. Once these two switches are triggered, the machine will stop and alarm.

[0021] The Y-axis measuring device 4 is a grating displacement detection mechanism, which includes a grating ruler 43, a grating reader 44 is arranged on the grating ruler 43, a slide 45 is arranged next to the grating reader 44, the slide 45 is arranged on a fixed slide rail 46, a Y-axis measuring rod 41 is arranged at the front end of the slide 45, and a spring shaft 47 is arranged at the rear end of the slide 45. The spring shaft 47 uses the spring force to push the slide 45 and the Y-axis measuring rod 41 forward. When the product (electric switch mechanism) is installed, the Y-axis measuring rod 41 is pressed against the product cross-link 5 under the action of the spring. When the product swing arm swings left and right, the Y-axis measuring rod 41 moves up and down synchronously with the product cross-link 5, driving the slide 45 to move, and the Y-axis displacement can be obtained through the detection of the grating ruler 43 and the grating reader 44.

[0022] The front end of the Y-direction measuring rod 41 is laterally provided with a detection wheel 42 through a bearing for rotation. The rotation of the detection wheel 42 facilitates relative sliding between the detection wheel 42 and the product cross-link 5, making the Y-direction measurement smoother.

[0023] The positioning fixture 2 includes a mounting seat 21, the top of which is a positioning mounting plate, on which a positioning structure corresponding to the switch mechanism is provided; a clamping structure for clamping the switch mechanism is provided on the positioning fixture 2. The product placement position can be located by the positioning mounting plate, and the product can be further fixed by the clamping structure, which is convenient for subsequent testing.

[0024] The positioning structure is a positioning pin corresponding to the positions of the two diagonal screw holes on the switch mechanism mounting plate; the clamping structure is a clamping device 22 arranged on the front side of the mounting seat 21. The structure of the clamping device 22 is as follows: Fig.11 As shown, it includes a pressing part at the bottom, a hinged part in the middle and a tightening part at the top, and the tightening head on the tightening part can be adjusted by a bolt; when in use, the pressing part is pressed down and the tightening part moves forward, thereby locking the electric switch mechanism.

[0025] The measurement accuracy of the Y-axis measuring device 4 is 5 μm; the measurement accuracy of the X-axis measuring device 3 is 50 μm. The travel range of the X-axis measuring device 3 is 50 mm; the travel range of the Y-axis measuring device 4 is 30 mm. With this measurement accuracy, the accuracy of the test results can be guaranteed.

[0026] A detection method for an electric switch mechanism detection device comprises the following steps: S1: placing the electric switch mechanism on the mounting seat 21 through the positioning structure, and clamping and fixing the electric switch mechanism through the clamping structure; S2: The right reaming holes of the two rocker arms of the electric switch mechanism are matched with the left and right hinge holes of the product cross link 5 and are hinged and constrained by the pin shaft; the distance between the two hinge points of the product cross link 5 is the same as the distance between the rotation points of the two rocker arms, and the two hinge points and the two rotation points have a total of four active points, which form a four-bar mechanism with the product cross link 5 and the two right shift blocks; the displacement value of the product cross link 5 in the X direction is obtained by the X-direction measuring device 3, and the displacement value of the product cross link 5 in the Y direction is obtained by the Y-direction measuring device 4; The working principle of the detection component is as follows: the product connecting shaft 9 and the X-axis measuring rod 33 are rigidly connected, the servo motor is started, and when the servo moving seat 31 on the linear motor module 34 moves left or right, the displacement value in the X-axis is obtained. The product connecting shaft 9 pushes or pulls the product cross-link 5 to move, and at the same time drives the two rocker arms to swing, so that the product cross-link 5 moves synchronously in the same plane. During the movement of the product cross-link 5, under the action of the spring shaft 47, the front end of the Y-axis measuring rod 41 is always kept on the product cross-link 5 and forms a following movement in the Y-axis, and the Y-axis displacement is obtained by the displacement change of the Y-axis measuring rod 41. S3: Find the 90° vertical reference position of the rocker arm of the electric switch mechanism through the cooperation of the Y-axis measuring device 4, the X-axis measuring device 3, the product connecting shaft 9 and the product cross connecting rod 5; S4: Move the rocker arm 8mm to the right from the 90° vertical reference position through the X-axis measuring device 3, and manually adjust the distance between the limit arm and the limit screw on the switch mechanism to a gap of 0.5~1mm; S5: Move the rocker arm from the 90° vertical reference position to the right to 10.5±0.7mm through the X-axis measuring device 3 to detect whether the switch is switched; if the switch is switched, the product is qualified, otherwise the product is unqualified.

[0027] Specifically, in the above S3, the method for finding the 90° vertical reference position of the rocker arm of the electric switch mechanism is: First, the Y-axis measuring device 4 is used to directly measure the approximate highest point A of the rocker arm; then, the X-axis measuring device 3 is used to push the rocker arm to the left and rotate it counterclockwise by 20-30° (preferably 25°, too small or too large a rotation angle is not conducive to rapid detection) to reach point B, and the Y-axis measuring device 4 is used to obtain the value of the height parameter Hy1; then, the X-axis measuring device 3 is used to pull the rocker arm to the right and rotate it clockwise, and then the Y-axis measuring device 4 is used to obtain the value of the height parameter Hy2. When Hy2=Hy1, point C is obtained, and the distance Ax between points BC is recorded. At this time, the highest point of the rocker arm in the y direction is in the vertical direction of the midpoint of the distance Ax; finally, when the X-axis measuring device 3 is used to push the rocker arm to the left and rotate counterclockwise to a distance of Ax / 2, point D is obtained. Point D is the highest point of the rocker arm in the y direction, that is, the 90° vertical reference position of the rocker arm of the electric switch mechanism is found. The position and distance of each point are represented as follows: Figure 7shown.

[0028] Inevitably, the device is also equipped with a cabinet 6, a chassis 7, a lighting lamp 8 and other structures similar to other detection equipment. The chassis 7 is provided with a display panel and control buttons and other structures. The chassis 7 uses the existing system to obtain the displacement readings from the Y-axis measuring device 4 and the X-axis measuring device 3 and to perform simple control on the servo motor of the X-axis measuring device 3.

[0029] It should be noted that the present invention does not involve any innovation of components. The above-mentioned sensors, detection devices, etc. can be obtained by purchasing existing parts and assembling them. It also does not involve any improvement in the coding of the control program. The technologies of controlling the displacement of the servo motor, measuring the distance through sensors and reading the data adopt existing technologies.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An electric switch mechanism detection device, comprising a base plate (1), characterized in that: The bottom plate (1) is provided with a positioning fixture (2), an X-axis measuring device (3) is provided on the right side of the positioning fixture (2), and a Y-axis measuring device (4) is provided on the rear side; the front end of the X-axis measuring device (3) is connected to a product connecting shaft (9), and the front end of the product connecting shaft (9) is hinged to a product transverse connecting rod (5); the left end of the connecting rod (4) and the left and right ends of the product transverse connecting rod (5) are both provided with hinge holes.

2. The electric switch mechanism detection device according to claim 1, characterized in that: The X-axis measuring device (3) is a servo motor linear motion mechanism, which comprises a linear motor module (34), a servo moving seat (31) is arranged on the linear motor module (34), a horizontal floating mechanism (32) is arranged on the servo moving seat (31), an X-axis measuring rod (33) is arranged in the horizontal floating mechanism (32) and in the direction of the positioning fixture (2), and the X-axis measuring rod (33) is connected to the rear end of the product connecting shaft (9).

3. The electric switch mechanism detection device according to claim 2, characterized in that: Three proximity switches (35) are arranged side by side on the linear motor module (34), the middle proximity switch (35) is an origin switch, and the two left and right proximity switches (35) are limit switches; a detection sheet (36) is arranged on the front side of the servo movable seat (31).

4. The electric switch mechanism detection device according to claim 2, characterized in that: The Y-axis measuring device (4) is a grating displacement detection mechanism, which comprises a grating ruler (43), a grating reader (44) is arranged on the grating ruler (43), a slide table (45) is arranged next to the grating reader (44), the slide table (45) is arranged on a fixed slide rail (46), a Y-axis measuring rod (41) is arranged at the front end of the slide table (45), and a spring shaft (47) is arranged at the rear end of the slide table (45), and the spring shaft (47) uses spring force to push the slide table (45) and the Y-axis measuring rod (41) forward.

5. The electric switch mechanism detection device according to claim 4, characterized in that: A detection wheel (42) is arranged at the front end of the Y-axis measuring rod (41) for transverse rotation.

6. The electric switch mechanism detection device according to claim 4, characterized in that: The positioning fixture (2) comprises a mounting seat (21), the top of the mounting seat (21) being a positioning mounting plate, the positioning mounting plate being provided with a positioning structure corresponding to the electric switch mechanism; and the positioning fixture (2) is provided with a clamping structure for clamping the electric switch mechanism.

7. The electric switch mechanism detection device according to claim 6, characterized in that: The positioning structure is a positioning pin corresponding to the positions of two diagonal screw holes on the switch mechanism mounting plate; and the clamping structure is a clamping device (22) arranged on the front side of the mounting seat (21).

8. The electric switch mechanism detection device according to claim 6, characterized in that: The measurement accuracy of the Y-direction measurement device (4) is 5 μm; the measurement accuracy of the X-direction measurement device 3 is 50 μm.

9. A detection method for the electric switch mechanism detection device according to claim 8, characterized in that: The steps include: S1: placing the electric switch mechanism on the mounting seat (21) through the positioning structure, and clamping and fixing the electric switch mechanism through the clamping structure; S2: The right hinge holes of the two rocker arms of the electric switch mechanism are aligned with the left and right hinge holes of the product cross link (5) and are hinged and constrained by a pin shaft; the distance between the two hinge points of the product cross link (5) is the same as the distance between the rotation points of the two rocker arms, and the two hinge points and the two rotation points have a total of four active points, which cooperate with the product cross link (5) and the two right shift blocks to form a four-bar linkage; the displacement value of the product cross link (5) in the X direction is obtained by the X-direction measuring device (3), and the displacement value of the product cross link (5) in the Y direction is obtained by the Y-direction measuring device (4); S3: Find the 90° vertical reference position of the rocker arm of the electric switch mechanism through the coordinated operation of the Y-axis measuring device (4), the X-axis measuring device (3), the product connecting shaft (9) and the product cross connecting rod (5); S4: Move the rocker arm 8 mm to the right from the 90° vertical reference position using the X-axis measuring device (3), and manually adjust the distance between the limit arm and the limit screw on the switch mechanism to 0.5-1 mm; S5: Move the rocker arm from the 90° vertical reference position to the right to 10.5±0.7 mm using the X-axis measuring device (3) to detect whether the switch has been switched.

10. The method for using the electric switch mechanism detection device according to claim 9, characterized in that: In S3, the method to find the 90° vertical reference position of the switch mechanism rocker arm is: First, the Y-axis measuring device (4) is manually used to directly measure the highest point A of the rocker arm with an error. Then, the X-axis measuring device (3) is used to push the rocker arm to the left and rotate it counterclockwise by 20-30° to reach point B, and the Y-axis measuring device (4) is used to obtain the value of the height parameter Hy1. Then, the X-axis measuring device (3) is used to pull the rocker arm to the right and rotate it clockwise, and the Y-axis measuring device (4) is used to obtain the value of the height parameter Hy2. When Hy2=Hy1, point C is obtained, and the distance Ax between points BC is recorded. At this time, the highest point of the rocker arm in the y-axis is in the direction of the vertical line of the midpoint of the distance Ax. Finally, when the X-axis measuring device (3) is used to push the rocker arm to the left and rotate it counterclockwise to a distance of Ax / 2, point D is obtained. Point D is the highest point of the rocker arm in the y-axis, that is, the 90° vertical reference position of the rocker arm of the electric switch mechanism is found.

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