A detection device and method for indicating relative displacement of rod and notch value

Abstract

The present invention relates to a device and method for detecting the relative displacement and gap value of a display rod. This device utilizes a magnetic grid and a magnetic field induction sensor (such as a Hall element or a magnetoresistive sensor) to detect the linear motion of the display rod. This non-contact measurement method is highly accurate, resistant to oil and dirt interference, and relatively low in cost. While detecting the contact gap value, the repulsive gap value, and the displacement of the rod during each transition, the system can also perform a self-check during each transition to prevent erroneous detection results due to faults in the detection system. Compared to existing methods that use two detection heads to detect the position of linear reciprocating parts, this device improves the real-time nature of detection data and reduces the amount of computation required by setting a zero coordinate. Furthermore, through the special arrangement of the two detection heads relative to the position of the detected magnetic grid, the detection system performs a self-check during each transition of the display rod, assessing the reliability of the detection data and detecting any system faults.

Description

Technical Field

[0001] The present invention relates to a switch switching device for monitoring the notch value of a switch machine indicating rod and the relative displacement of the indicating rod during the switch machine switching process, and in particular to a detection device and method for the relative displacement and notch value of the indicating rod. Background Art

[0002] The indicator rod in the switch is connected to the movable part of the turnout to reflect its position. Usually, an inspection notch is processed on the indicator rod, and an inspection part is set inside the switch. When the inspection notch of the indicator rod does not match the position of the inspection part, the inspection part cannot fall into the inspection notch of the indicator rod, and the switch is in a fault state, which is called a stuck notch fault. Usually, each indicator rod is composed of two structures, respectively called the left indicator rod and the right indicator rod, and also called the main indicator rod and the auxiliary indicator rod. This article uses the left indicator rod and the right indicator rod to illustrate. There are two inspection notches on the left indicator rod and the right indicator rod respectively, one is a close-fitting inspection notch and the other is a repulsive inspection notch. The position of the close-fitting notch of the left indicator rod matches the position of the repulsive notch of the right indicator rod, and the position of the repulsive notch of the left indicator rod matches the position of the close-fitting notch of the right indicator rod. When the close-fitting notch position of one rod and the repulsive notch position of the other rod both match the inspection part, the inspection part can fall into the inspection notch normally.

[0003] Due to changes in the ambient temperature of use, wear of holes and pins during long-term use, and changes in the switch under the influence of various factors, the position of the inspection notch of the switch indicator rod will change relative to the inspection part. When the change value exceeds the limit value, the inspection part cannot fall into the inspection notch of the indicator rod, and the switch cannot connect the indication circuit, and the switch cannot allow the train to pass. This will affect the transportation efficiency, especially when the gap value between the close inspection notch and the close inspection part is small, it is more likely to cause a stuck notch failure.

[0004] Equipment maintenance personnel hope to adjust the position of the indicator rod inspection notch before it changes beyond the limit value to reduce the problem of stuck notch. In order to monitor the position change of the indicator rod inspection notch, related companies have developed a variety of monitoring equipment, which can be generally divided into two categories: one is contact detection and the other is non-contact detection. Among the contact detection methods, such as the bead type, a bead is installed on the side wall of the inspection part, extending a certain value from the detection surface. When the bead contacts the surface to be inspected, an alarm is issued to warn that the notch value is close to the limit value of the stuck notch. The failure rate of this solution is high during use, and it artificially increases the failure rate of the stuck notch during the use of the switch. Therefore, this method has been gradually eliminated. Non-contact detection mainly includes video and electromagnetic methods. This type of solution solves the problem of contact detection equipment increasing the switch machine gap failure. However, the existing solutions still have certain problems in use. For example, the video method has a large amount of data, a relatively complex data communication structure, slightly poor data real-time performance, and poor anti-pollution performance. The electromagnetic method has a small amount of data and better real-time performance, but the existing method currently only detects close gaps, and there is no repulsive gap data, nor displacement data of switch conversion, and it cannot detect erroneous data detected by abnormalities in the monitoring system.

[0005] For the convenience of description, the gap value is specified as the relative distance value between the designated side of the inspection part that is close to or repelled from the inspection part and the designated side of the inspection gap along the movement direction of the indicating rod. When the value is appropriate, the inspection part can enter the corresponding inspection gap. When the value is inappropriate, the inspection part cannot enter the inspection gap. Summary of the Invention

[0006] The purpose of the present invention is to provide a detection device and method for indicating the relative displacement of a rod and the value of a gap, so as to simultaneously detect the values of the close gap, the repulsive gap and the relative displacement of the rod. The system has a self-checking function, which can reduce system failures and prevent system failures within a certain range from causing erroneous detection results.

[0007] The technical solution of the present invention is: it relates to a detection device for the relative displacement and gap value of the indicating rod, which is characterized by: at least including: a left indicating rod, a right indicating rod, a first close contact inspection part, a second close contact inspection part, a first repulsion inspection part, and a second repulsion inspection part, the first close contact inspection part and the first repulsion inspection part are used to inspect the gap position of the left indicating rod, the second close contact inspection part and the second repulsion inspection part are used to inspect the gap position of the right indicating rod, a first magnetic grid, a second magnetic grid, a first detection head, a second detection head, a third detection head, and a fourth detection head, the first magnetic grid is fixed on the surface of the left indicating rod, the second magnetic grid is fixed on the surface of the right indicating rod, the first magnetic grid and the second magnetic grid have periodically distributed magnetic materials and a periodic magnetic field distribution generated by the magnetic materials, the direction of the periodic change of the magnetic field is parallel to the linear motion direction of the left indicating rod and the right indicating rod, the first detection head, the second detection head, the third detection head and the fourth detection head are composed of a magnetic field detection sensor and its supporting circuit, and are used to detect the magnetic field of the first magnetic grid and the second magnetic grid.

[0008] The first detection head and the third detection head form a group, which are distributed and fixedly installed along the reciprocating motion direction of the right rod of the indicator rod, and are used to detect the magnetic field of the second magnetic grid on the right rod of the indicator rod; the second detection head and the fourth detection head form a group, which are distributed and fixedly installed along the reciprocating motion direction of the left rod of the indicator rod, and are used to detect the magnetic field of the first magnetic grid on the left rod of the indicator rod.

[0009] The right rod of the indicating rod has a range of motion, within which the first detection head is within the minimum detectable range of the second magnetic grid magnetic field. When the right rod of the indicating rod moves to a fixed position relative to the first detection head, the third detection head leaves the minimum detectable range of the second magnetic grid magnetic field or enters the minimum detectable range of the second magnetic grid magnetic field; the left rod of the indicating rod has a range of motion, within which the fourth detection head is within the minimum detectable range of the first magnetic grid magnetic field. When the left rod of the indicating rod moves to a fixed position relative to the fourth detection head, the second detection head leaves the minimum detectable range of the first magnetic grid magnetic field or enters the minimum detectable range of the first magnetic grid magnetic field.

[0010] The minimum detectable range of the magnetic field is the detection sensitivity value within which the detection head hardware and corresponding software can identify the magnetic field and calculate the corresponding magnetic field period position.

[0011] The magnetic field detection sensor includes but is not limited to a Hall sensor and a magnetoresistive sensor.

[0012] A detection method for indicating the relative displacement of a rod and the value of a notch comprises at least the following steps:

[0013] 1) After the first close fit inspection part enters the close fit inspection gap of the left rod of the indicator rod, adjust the position of the left rod of the indicator rod so that the left rod of the indicator rod moves to the right until the left side of the first close fit inspection part is in contact with the left side of the close fit inspection gap. Record the value of the first magnetic grid position detected by the fourth detection head at this time, and use it as the relative zero coordinate to define the positive direction of displacement;

[0014] 2) Afterwards, the fourth detection head detects the position of the first magnetic grid and outputs a corresponding signal or value. The adjacent position values are subtracted, and the resulting data is the relative displacement of the fourth detection head and the first magnetic grid during two adjacent sampling times. The cumulative sum of all relative displacements since the zero coordinate is set is the displacement S of the first magnetic grid relative to the zero coordinate position at the current moment; that is, the displacement S of the left rod relative to the left side of the first close-fitting inspection part; based on the value and direction of this displacement S, the gap value between the first close-fitting inspection part and its corresponding close-fitting inspection notch can be calculated;

[0015] 3) At the same time, based on the calculated displacement S and the distance L1 between the first contact inspection part and the first repulsion inspection part, the distance L2 between the contact inspection notch and the repulsion inspection notch of the left rod, and the characteristic parameter L3 of the repulsion inspection part, the repulsion inspection notch value between the left rod and the first repulsion inspection part can be calculated;

[0016] 4) Similarly, the displacement of the right rod of the indicating rod relative to the right side of the second close-fitting inspection part can be detected. According to the value and direction of this displacement, the gap value between the second close-fitting inspection part and its corresponding close-fitting inspection gap can be calculated, and then the repulsive gap value between the right rod of the indicating rod and the second repulsive inspection part can be calculated.

[0017] After the left rod of the indicating rod sets the zero coordinate according to the position value detected by the fourth detection head, it continues to move until the second detection head leaves the lowest detectable range of the first magnetic grid magnetic field or enters the lowest detectable range of the first magnetic grid magnetic field. The position value detected by the fourth detection head within the magnetic field cycle and the displacement of the left rod of the indicating rod are recorded as the system characteristic value of the left rod of the indicating rod.

[0018] After the right rod of the indicating rod is set to zero coordinate according to the position value detected by the first detection head, it continues to move until the third detection head leaves the lowest detectable range of the second magnetic grid magnetic field or enters the lowest detectable range of the second magnetic grid magnetic field. The position value detected by the first detection head within the magnetic field cycle and the displacement of the left rod of the indicating rod are recorded as the system characteristic value of the left rod of the indicating rod.

[0019] During the movement of the left rod of the indicator rod, when the second detection head leaves or enters the lowest detectable range of the magnetic field of the first magnetic grid, check whether the detected first magnetic grid position value and its displacement value relative to the zero coordinate are within the specified range with the recorded system characteristic value deviation. If they exceed the specified range, there is a fault in the system and the agreed fault information is output. If they do not exceed the specified range, the detection data is credible and the corresponding detection value is output.

[0020] During the right rod movement, when the third detection head leaves or enters the lowest detectable range of the second magnetic grid magnetic field, check whether the detected second magnetic grid position value and its displacement value relative to the zero coordinate are within the specified range with the recorded system characteristic value. If they exceed the specified range, the system has a fault and the agreed fault information is output. If they do not exceed the specified range, the detection data is credible and the corresponding detection value is output.

[0021] The advantages of this invention include: utilizing a magnetic grid and a magnetic field sensor (such as a Hall element or magnetoresistive sensor) to detect the linear motion of a measuring rod, resulting in a highly accurate, oil-resistant, and relatively low-cost non-contact measurement method. While detecting the contact gap value, the repulsion gap value, and the rod displacement during each transition, the system also performs a self-check during each transition, preventing erroneous detection results due to system failures. Compared to existing methods that use two detection heads to detect the position of linear reciprocating parts, this invention improves the real-time nature of detection data and reduces computational complexity by setting a zero coordinate. Furthermore, through the unique arrangement of the two detection heads relative to the position of the magnetic grid being detected, the detection system performs a self-check during each transition of the measuring rod, assessing the reliability of the detection data and detecting any system failures.

[0022] The present invention will be further described below in conjunction with the accompanying drawings of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of an embodiment of the present invention; Figure 1 The close inspection notch of the left rod of the middle indicating rod and the repulsive inspection notch of the right rod of the indicating rod both move to positions matching the inspection parts, and the inspection parts on this side fall into the inspection notches.

[0024] Figure 2 It is a schematic diagram of the calculation principle of the present invention for calculating the repulsive gap value through the close gap value.

[0025] In the figure: 1 represents the left rod; 2 represents the right rod; 3-1, the first magnetic grid; 3-2, the second magnetic grid; 4, the first detection head; 5, the second detection head; 6, the third detection head; 7, the fourth detection head; 8-1, the first close-fitting inspection part; 9-1, the first repulsive inspection part; 8-2, the second close-fitting inspection part; 9-2, the second repulsive inspection part. DETAILED DESCRIPTION

[0026] like Figure 1 As shown, the present invention relates to a detection device and method for the relative displacement and gap value of an indicating rod, which at least includes: a left indicating rod 1, a right indicating rod 2, a first close contact inspection part 8-1, a second close contact inspection part 8-2, a first repulsion inspection part 9-1, and a second repulsion inspection part 9-2. The first close contact inspection part 8-1 and the first repulsion inspection part 9-1 are used to inspect the gap position of the left indicating rod 1, the second close contact inspection part 8-2 and the second repulsion inspection part 9-2 are used to inspect the gap position of the right indicating rod 2, a first magnetic grid 3-1, a second magnetic grid 3-2, a first detection head 4, a second detection head 5, a third detection head 6, and a fourth detection head 7. The first magnetic grid 3-1 is fixed on the surface of the left indicating rod 1, and the second magnetic grid 3-2 is fixed on the surface of the right indicating rod. On the surface of the rod 2, there are periodically distributed magnetic materials and periodic magnetic field distributions generated by the magnetic materials on the first magnetic grid 3-1 and the second magnetic grid 3-2. The direction of periodic change of the magnetic field is parallel to the linear movement direction of the left rod 1 and the right rod 2. The first detection head 4, the third detection head 6, the second detection head 5 and the fourth detection head 7 are composed of magnetic field detection sensors and their supporting circuits and devices. They are matched and fixedly installed to detect the magnetic fields of the first magnetic grid 3-1 and the second magnetic grid 3-2. The first detection head 4 and the third detection head 6 are a group to detect the magnetic field of the second magnetic grid 3-2, but cannot detect the magnetic field of the first magnetic grid 3-1. The second detection head 5 and the fourth detection head 7 are a group to detect the magnetic field of the first magnetic grid 3-1, but cannot detect the magnetic field of the second magnetic grid 3-2.

[0027] The distance between the cooperating detection heads and the magnetic grid perpendicular to the direction of motion of the magnetic grid satisfies the requirements for generating a detection signal. That is, when the magnetic grid passes through the cooperating detection head, the sensor in the detection head is within the effective magnetic field generated by the corresponding magnetic grid. The detection head in the effective magnetic field outputs a signal or actual position value that matches the specific position value within the magnetic grid cycle. The difference between the position value and the previous moment is the displacement relative to the previous moment. The accumulated displacement starting from the zero coordinate is the coordinate value corresponding to each moment. The first detection head 4 is fixedly installed so that it is continuously within the effective magnetic field of the second magnetic grid 3-2 within the designed motion range of the right rod 2 of the indicator rod. The fourth detection head 7 is fixedly installed so that it is continuously within the effective magnetic field of the first magnetic grid 3-1 within the designed motion range of the left rod 1 of the indicator rod. The third detection head 6 is fixedly installed so that it is within the designed motion range of the right rod 2 of the indicator rod and may experience a state change between being able to detect the magnetic field of the second magnetic grid 3-2 and being unable to detect the magnetic field of the second magnetic grid 3-2. The second detection head 5 is fixedly installed so that it is within the designed motion range of the left rod 1 of the indicator rod and may experience a state change between being able to detect the magnetic field of the first magnetic grid 3-1 and being unable to detect the magnetic field of the first magnetic grid 3-1.

[0028] After the second detection head 5 and the fourth detection head 7 are fixedly installed, the distance between the magnetic field detection sensors in the second detection head 5 and the fourth detection head 7 is fixed, and they are fixed relative to the measurement reference. When the left rod 1 of the indication rod moves to the left (in the direction of the drawing, the left and right directions below are based on the direction of the drawing) to the stop position within the designed movement range, the second detection head 5 and the fourth detection head 7 can both detect the magnetic field of the first magnetic grid 3-1. When it moves to the right to the stop position, the fourth detection head 7 can detect the magnetic field of the first magnetic grid 3-1, and the third detection head 5 cannot detect the magnetic field of the first magnetic grid 3-1.

[0029] After the first detection head 4 and the third detection head 6 are fixedly installed, the distance between the magnetic field detection sensors in the first detection head 4 and the third detection head 6 is fixed, and they are fixed relatively to the measurement reference; when the right rod 2 of the indicating rod moves to the left to the stop position within the designed movement range, the first detection head 4 can detect the magnetic field of the second magnetic grid 3-2, and the third detection head 6 cannot detect the magnetic field of the second magnetic grid 3-2; when it moves to the right to the stop position, both the first detection head 4 and the third detection head 6 can detect the magnetic field of the second magnetic grid 3-2.

[0030] like Figure 1 and Figure 2 As shown, the present invention relates to a detection method for indicating the relative displacement of a rod and a value of a gap, comprising the following steps:

[0031] After the first close fitting inspection part 8-1 enters the close fitting inspection gap of the left rod 1 of the indicating rod, adjust the position of the left rod 1 of the indicating rod so that the left rod 1 of the indicating rod moves to the right until the left side of the first close fitting inspection part 8-1 is in contact with the left side of the close fitting inspection gap, and record the position value of the first magnetic grid 3-1 detected by the fourth detection head 7 at this time (the specific value within the magnetic field cycle), use it as the relative zero coordinate and specify the positive direction of the displacement.

[0032] Next, the fourth detection head 7 detects the position of the first magnetic grid 3-1. Adjacent position values are subtracted to obtain the relative displacement between the fourth detection head 7 and the first magnetic grid 3-1 during two consecutive sampling times. The cumulative total of all relative displacements since the zero coordinate is set is the displacement S of the first magnetic grid 3-1 relative to the zero coordinate at the current moment. This represents the displacement S of the left rod 1 relative to the left side of the first close-fitting inspection component 8-1. Based on the value and direction of this displacement S, the gap between the left side of the first close-fitting inspection component 8-1 and the left side of its corresponding close-fitting inspection notch can be calculated.

[0033] At the same time, based on the above-mentioned calculated displacement S and the distance L1 between the first close contact inspection part 8-1 and the first repulsive inspection part 9-1, the distance L2 between the close contact inspection gap and the repulsive inspection gap of the left rod 1, and the characteristic parameter L3 of the repulsive inspection part (the horizontal length of the hypotenuse of the repulsive inspection part, if this part does not have a hypotenuse, this value is zero), the repulsive gap value between the left rod 1 and the first repulsive inspection part 9-1 can be calculated, see Figure 2 .

[0034] Similarly, the displacement of the right rod 2 relative to the right side of the second close contact detection component 8-2 can be detected. Based on the value and direction of this displacement, the gap between the second close contact detection component 8-2 and its corresponding close contact detection gap can be calculated, and the repulsion gap value between the right rod 2 and the second repulsion detection component 9-2 can be calculated.

[0035] In specific application, when the first close-fitting inspection part 8-1 enters the close-fitting inspection gap of the left rod 1 of the indicating rod, the relative displacement of the second close-fitting inspection part 8-2 and the right rod 2 of the indicating rod is used to calculate the repulsion gap gap value between the second repulsion inspection part 9-2 and the right rod 2 of the indicating rod; when the second close-fitting inspection part 8-2 enters the close-fitting inspection gap of the right rod 2 of the indicating rod, the relative displacement of the first close-fitting inspection part 8-1 and the left rod 1 of the indicating rod is used to calculate the repulsion gap gap value between the first repulsion inspection part 9-1 and the left rod 1 of the indicating rod.

[0036] The setting of the relative zero coordinate is not the only position described in the above working method. Other characteristic positions can be selected without affecting the detection and calculation of the close-fitting notch, the repulsive notch and the displacement of the indicating rod. They will not be described one by one in this document.

[0037] The close contact inspection part and the repulsion inspection part on the left or right side can be an integral structure or the same part, which does not affect the application of the present invention. For example, in Example 1, the first close contact inspection part 8-1 and the second repulsion inspection part 9-2 can be the same part, and the second close contact inspection part 8-2 and the first repulsion inspection part 9-1 can be the same part.

[0038] Whether the side surfaces of the repulsion inspection part and the repulsion inspection notch are inclined does not affect the application of the present invention and is only related to the design of the switch machine.

Claims

1. A detection device for indicating the relative displacement of a rod and the value of a gap, characterized in that: at least include: The left rod of the indicating rod (1), the right rod of the indicating rod (2), the first close contact inspection part (8-1), the second close contact inspection part (8-2), the first repulsion inspection part (9-1), the second repulsion inspection part (9-2), the first close contact inspection part (8-1) and the first repulsion inspection part (9-1) are used to inspect the gap position of the left rod of the indicating rod (1), the second close contact inspection part (8-2) and the second repulsion inspection part (9-2) are used to inspect the gap position of the right rod of the indicating rod (2), the first magnetic grid (3-1), the second magnetic grid (3-2), the first detection head (4), the second detection head (5), the third detection head (6), the fourth detection head Head (7), the first magnetic grid (3-1) is fixed on the surface of the left rod (1) of the indicating rod, the second magnetic grid (3-2) is fixed on the surface of the right rod (2) of the indicating rod, the first magnetic grid (3-1) and the second magnetic grid (3-2) have periodically distributed magnetic materials and periodic magnetic field distribution generated by the magnetic materials, the direction of periodic change of the magnetic field is parallel to the linear motion direction of the left rod (1) and the right rod (2) of the indicating rod, the first detection head (4), the second detection head (5), the third detection head (6) and the fourth detection head (7) are composed of magnetic field detection sensors and supporting circuits thereof, and are used to detect the magnetic fields of the first magnetic grid (3-1) and the second magnetic grid (3-2); The first detection head (4) and the third detection head (6) are a group, distributed along the reciprocating motion direction of the right rod (2) of the indicating rod and fixedly installed, and are used to detect the magnetic field of the second magnetic grid (3-2) on the right rod (2) of the indicating rod; the second detection head (5) and the fourth detection head (7) are a group, distributed along the reciprocating motion direction of the left rod (1) of the indicating rod and fixedly installed, and are used to detect the magnetic field of the first magnetic grid (3-1) on the left rod (1) of the indicating rod; The right rod (2) of the indicating rod has a range of motion, within which the first detection head (4) is within the minimum detectable range of the magnetic field of the second magnetic grid (3-2), and when the right rod (2) of the indicating rod moves to a fixed position relative to the first detection head (4), the third detection head (6) leaves the minimum detectable range of the magnetic field of the second magnetic grid (3-2) or enters the minimum detectable range of the magnetic field of the second magnetic grid (3-2); the left rod (1) of the indicating rod has a range of motion, within which the fourth detection head (7) is within the minimum detectable range of the magnetic field of the first magnetic grid (3-1), and when the left rod (1) of the indicating rod moves to a fixed position relative to the fourth detection head (7), the second detection head (5) leaves the minimum detectable range of the magnetic field of the first magnetic grid (3-1) or enters the minimum detectable range of the magnetic field of the first magnetic grid (3-1); The minimum detectable range of the magnetic field is the detection sensitivity value within which the detection head hardware and corresponding software can identify the magnetic field and calculate the corresponding magnetic field period position; The magnetic field detection sensor includes a Hall sensor and a magnetoresistive sensor.

2. A detection method for indicating the relative displacement of a rod and the value of a notch, characterized by: A detection method comprising a detection device for indicating the relative displacement of a rod and a value of a gap based on claim 1 comprises the following steps: 1) After the first close-fitting inspection part (8-1) enters the close-fitting inspection gap of the left rod of the indicating rod (1), the position of the left rod of the indicating rod (1) is adjusted so that the left rod of the indicating rod (1) moves rightward until the left side of the first close-fitting inspection part (8-1) is in contact with the left side of the close-fitting inspection gap, and the position value of the first magnetic grid (3-1) detected by the fourth detection head (7) at this time is recorded and used as the relative zero coordinate to define the positive direction of displacement; 2) Afterwards, the fourth detection head (7) detects the position of the first magnetic grid (3-1) and outputs a corresponding signal or value, and the adjacent position values are subtracted. The data obtained is the relative displacement of the fourth detection head (7) and the first magnetic grid (3-1) within two adjacent sampling times. The accumulation of all relative displacements after the zero coordinate is set is the displacement S of the first magnetic grid (3-1) relative to the zero coordinate position at the current moment; that is, the displacement S of the left rod (1) relative to the left side of the first close-fitting inspection part (8-1); based on the value and direction of this displacement S, the gap value between the first close-fitting inspection part (8-1) and its corresponding close-fitting inspection gap can be calculated; 3) At the same time, based on the displacement S calculated above and the distance L1 between the first close contact inspection part (8-1) and the first repulsion inspection part (9-1), the distance L2 between the close contact inspection gap and the repulsion inspection gap of the left rod (1), and the characteristic parameter L3 of the repulsion inspection part, the repulsion gap value between the left rod (1) and the first repulsion inspection part (9-1) can be calculated; 4) Similarly, the displacement of the right rod (2) of the indicating rod relative to the right side of the second close-fitting inspection part (8-2) can be detected. Based on the value and direction of this displacement, the gap value between the second close-fitting inspection part (8-2) and its corresponding close-fitting inspection gap can be calculated, and then the repulsion gap value between the right rod (2) of the indicating rod and the second repulsion inspection part (9-2) can be calculated.

3. A detection method for indicating the relative displacement of a rod and the value of a notch according to claim 2, characterized in that: Step 2) also includes the following steps: After the left rod (1) of the indicating rod sets the zero coordinate according to the position value detected by the fourth detection head (7), it continues to move until the second detection head (5) leaves the lowest detectable range of the magnetic field of the first magnetic grid (3-1) or enters the lowest detectable range of the magnetic field of the first magnetic grid (3-1), and the position value within the magnetic field cycle detected by the fourth detection head (7) and the displacement of the left rod (1) of the indicating rod are recorded as the system characteristic value of the left rod (1).

4. A detection method for indicating the relative displacement of a rod and the value of a notch according to claim 2, characterized in that: Step 4) also includes the following steps: After the right rod (2) of the indicating rod sets the zero coordinate according to the position value detected by the first detection head (4), it continues to move until the third detection head (6) leaves the lowest detectable range of the magnetic field of the second magnetic grid (3-2) or enters the lowest detectable range of the magnetic field of the second magnetic grid (3-2), and records the position value within the magnetic field cycle detected by the first detection head (4) and the displacement of the left rod (2) of the indicating rod, which are used as the system characteristic value of the left rod (2) of the indicating rod.

5. The method for detecting the relative displacement of a rod and the value of a notch according to claim 2, wherein: Step 2) also includes the following steps: During the movement of the left rod (1), when the second detection head (5) leaves or enters the lowest detectable range of the magnetic field of the first magnetic grid (3-1), the detected position value of the first magnetic grid (3-1) and its displacement value relative to the zero coordinate are checked to see whether the deviation from the recorded system characteristic value is within a specified range. If it exceeds the specified range, the system has a fault and the agreed fault information is output. If it does not exceed the specified range, the detection data is credible and the corresponding detection value is output.

6. A detection method for indicating rod relative displacement and notch value according to claim 2, characterized in that: Step 4) also includes the following steps: During the movement of the right rod (2), when the third detection head (6) leaves or enters the lowest detectable range of the magnetic field of the second magnetic grid (3-2), the detected position value of the second magnetic grid (3-2) and its displacement value relative to the zero coordinate are checked to see whether the deviation from the recorded system characteristic value is within a specified range. If it exceeds the specified range, the system has a fault and the agreed fault information is output. If it does not exceed the specified range, the detection data is credible and the corresponding detection value is output.

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