Cast conductor detection tool

Abstract

The utility model belongs to the field of size measurement, and particularly relates to a cast conductor detection tool. In order to conveniently detect whether a cast conductor is qualified or not, the utility model provides a cast conductor detection tool. The cast conductor detection tool comprises a limiting structure used for limiting a cast conductor, a contact channel detection assembly used for detecting the size of a contact channel, and an operating hole detection shaft used for detecting the size of an operating hole. The limiting structure comprises a limiting base used for supporting the cast conductor, an annular protrusion detection hole used for allowing the annular protrusion to be inserted therein and four installation hole detection pieces used for being inserted into different installation holes, and the annular protrusion detection hole and the installation hole detection pieces are all arranged on the limiting base. The limiting seat is also provided with an operation hole detection hole used for limiting the operation hole detection shaft and a contact channel detection hole used for limiting the contact channel detection assembly. The cast conductor is detected in a simulated installation mode, a three-coordinate coordinate system does not need to be established, and the burden of workers can be effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the field of size measurement, in particular to a casting conductor detection tool. Background Art

[0002] The Chinese invention patent with the authorization announcement number CN114512364B and the authorization announcement date of 2024.06.04 discloses a three-phase common box type three-position isolating grounding switch, such as Figures 1 to 5 As shown, a cast conductor 1 is used in the three-position switch. The cast conductor 1 has a contact channel 101 and an operating hole 102. The moving contact 2 is installed on the contact channel 101, and the gear shaft 3 is installed on the operating hole 102. The gear shaft 3 engages with the moving contact 2 to drive the moving contact 2 to move, thereby switching the open and closed states of the three-position switch.

[0003] The cast conductor 1 is mounted on the pot insulator 5. Specifically, four connectors 4 (preferably bolts) are passed through four mounting holes 104 on the cast conductor 1 and connected to the pot insulator 5. The annular protrusion 103 on the cast conductor 1 is inserted into the groove on the pot insulator 5.

[0004] After the cast conductor 1 is manufactured, it is necessary to inspect the cast conductor 1. The inspection contents include the following items:

[0005] (1) The dimensions of the contact channel 101, which include the smaller aperture r in the middle of the contact channel 101, the larger aperture R at the end of the contact channel 101, and the verticality and coaxiality of the contact channel 101, to ensure that the moving contact 2 can be installed on the contact channel 101;

[0006] (2) The dimensions of the operating hole 102, which include the diameter, perpendicularity, and coaxiality of the operating hole 102, to ensure that the gear shaft 3 can be installed in the operating hole 102;

[0007] (3) The relative positions of the contact channel 101, the operating hole 102, the mounting hole 104 and the annular protrusion 103 are to ensure that after the cast conductor 1 is installed on the pot insulator 5, the moving contact 2 and the gear shaft 3 are located at a specific position and can engage with each other.

[0008] At present, when inspecting the cast conductor 1, the staff needs to first establish a three-coordinate coordinate system and use a variety of inspection tools such as calipers, micrometers, and height gauges to detect the coordinates of key points on the cast conductor 1. This is time-consuming and labor-intensive, and the staff needs to manually measure a lot of data, which is prone to human errors, resulting in inaccurate inspection results. Utility Model Content

[0009] The purpose of the utility model is to provide a cast conductor detection tool to solve the technical problem that manual detection of cast conductors requires the establishment of a three-coordinate coordinate system and manual measurement of coordinates at multiple points, which is not only time-consuming and labor-intensive, but also results in inaccurate detection results.

[0010] To achieve the above-mentioned purpose, the technical solution of the cast conductor detection tooling provided by the present invention is:

[0011] A cast conductor detection tool comprises a limiting structure for limiting the cast conductor, a contact channel detection assembly for detecting the size of a contact channel, and an operating hole detection shaft for detecting the size of an operating hole; the limiting structure comprises a limiting seat for supporting the cast conductor, an annular protrusion detection hole for inserting an annular protrusion, and four mounting hole detection pieces for inserting into different mounting holes, the annular protrusion detection hole and the mounting hole detection pieces are both arranged on the limiting seat, and the limiting seat is also provided with an operating hole detection hole for limiting the operating hole detection shaft and a contact channel detection hole for limiting the contact channel detection assembly.

[0012] Furthermore, the contact channel detection assembly includes a contact channel detection shaft and a sleeve detachably mounted on one end of the contact channel detection shaft, the sleeve having a large-diameter detection section for detecting a larger aperture R at the end of the contact channel, the end of the contact channel detection shaft away from the sleeve having a large-diameter detection section for detecting a larger aperture R at the end of the contact channel, and the middle portion of the contact channel detection shaft having a small-diameter detection section for detecting a smaller aperture r in the middle portion of the contact channel.

[0013] Furthermore, the contact channel detection assembly includes a contact channel detection shaft and two sleeves detachably mounted on both ends of the contact channel detection shaft, each sleeve having a large-diameter detection section for detecting the larger aperture R at the end of the contact channel, and the middle part of the contact channel detection shaft having a small-diameter detection section for detecting the smaller aperture r in the middle part of the contact channel.

[0014] Furthermore, the contact channel detection assembly includes two contact channel detection shafts that are plugged into each other, and the part of each contact channel detection shaft close to the other contact channel detection shaft has a small-diameter detection section for detecting the smaller aperture r in the middle of the contact channel, and the end of each contact channel detection shaft away from the other contact channel detection shaft has a large-diameter detection section for detecting the larger aperture R at the end of the contact channel.

[0015] Furthermore, the limit seat is provided with two operating hole detection parts, each of which is provided with the operating hole detection hole, and the distance between the two operating hole detection parts is used to match the length of the operating hole.

[0016] Furthermore, the limit seat is provided with two contact channel detection parts, each of which is provided with the contact channel detection hole, and the distance between the two contact channel detection parts is used to match the length of the contact channel.

[0017] Furthermore, the mounting hole detection member is detachably mounted on the limiting seat, and the mounting hole detection member is used to be mounted on the limiting seat after the cast conductor is mounted on the limiting seat.

[0018] Furthermore, an avoidance structure is provided on the operating hole detection shaft and / or the contact channel detection assembly, so that the operating hole detection shaft and the contact channel detection assembly can be installed on the same cast conductor at the same time.

[0019] The beneficial effects of the cast conductor detection tool of the utility model are as follows: The utility model is a pioneering invention. In the utility model, the cast conductor is detected by simulated installation. When detecting the cast conductor, the following steps can be followed:

[0020] Step S1: Insert the annular protrusion of the cast conductor into the annular protrusion detection hole, and insert the four mounting hole detection pieces into different mounting holes respectively, to ensure that the cast conductor can be properly installed on the pot-type insulator. If it can be properly installed, it is proved that the dimensions of the annular protrusion and the mounting hole are qualified, and the relative position relationship between the annular protrusion and the mounting hole is qualified. If it cannot be properly installed, it is proved that the cast conductor is unqualified.

[0021] Step S2: Because the limit seat supports the cast conductor, and the four mounting holes and the annular protrusion detection hole restrict the position of the cast conductor, the contact channel and the operating hole of the cast conductor are in a specific position (i.e., the contact channel, the operating hole, the mounting hole, and the annular protrusion have a specific positional relationship). At this time, the contact channel detection hole is used to limit the contact channel detection assembly, and the contact channel detection assembly is installed on the contact channel. If the contact channel detection assembly can be properly installed on the contact channel, it is confirmed that the size of the contact channel and the relative positional relationship with the annular protrusion are qualified. If the contact channel detection assembly cannot be properly installed, it is confirmed that the cast conductor is unqualified.

[0022] At the same time, use the operating hole detection hole to limit the operating hole detection shaft, and install the operating hole detection shaft on the operating hole. If the operating hole detection shaft can be installed on the operating hole normally, it proves that the size of the operating hole and the relative position relationship with the annular protrusion are qualified. On the basis that the contact channel is qualified, the position relationship between the contact channel and the operating hole is also qualified. If the operating hole detection shaft cannot be installed normally, it proves that the cast conductor is unqualified.

[0023] In any of the above steps, the length of the contact channel and the length of the operating hole are measured with a ruler or other means to determine whether the lengths of the contact channel and the operating hole are qualified.

[0024] When all the above measurement data are qualified, the cast conductor is certified as qualified. During the above measurement process, the cast conductor is mounted on the cast conductor detection fixture, which can conveniently detect the data of the cast conductor that is difficult to measure. After that, only simple length dimensions need to be measured using a ruler or other means. During the entire detection process, there is no need to establish a three-coordinate coordinate system, which can effectively reduce the burden on the staff, save time and effort, and the staff only needs to measure a small amount of data, which can effectively reduce human error and improve the accuracy of the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural diagram of the cast conductor used in an existing three-position isolating and grounding switch;

[0026] Figure 2 It is a schematic diagram of the main view of an existing cast conductor;

[0027] Figure 3 is a schematic cross-sectional view of an existing cast conductor;

[0028] Figure 4 It is a right side schematic diagram of an existing cast conductor;

[0029] Figure 5 It is a structural diagram of the annular protrusion and mounting hole of the existing cast conductor;

[0030] Figure 6 It is a front view schematic diagram of the limiting structure in the first cast conductor detection tool of the utility model;

[0031] Figure 7 It is a left side schematic diagram of the limiting structure in the first cast conductor detection tool of the utility model;

[0032] Figure 8 This is a top view schematic diagram of the limiting structure in the first cast conductor detection tooling of the utility model;

[0033] Figure 9 This is a schematic structural diagram of a contact channel detection shaft in the first cast conductor detection tool of the present utility model;

[0034] Figure 10 This is a schematic structural diagram of a shaft sleeve in the first cast conductor detection tooling of the present utility model;

[0035] Figure 11 It is a top view schematic diagram of the operating hole detection shaft in the first cast conductor detection tool of the utility model;

[0036] Figure 12 It is a left side schematic diagram of the operating hole detection shaft in the first cast conductor detection tool of the utility model;

[0037] Figure 13 This is a front view schematic diagram of the limiting structure in the second cast conductor detection tooling of the present invention.

[0038] Description of reference numerals:

[0039] 1. Cast conductor; 101. Contact channel; 102. Operating hole; 103. Annular protrusion; 104. Mounting hole; 2. Moving contact; 3. Gear shaft; 4. Connector; 5. Basin insulator; 6. Base plate; 601. Detection piece mounting hole; 602. Annular protrusion detection hole; 603. Mounting hole detection piece; 7. Contact channel detection part; 701. Contact channel detection hole; 8. Operating hole detection part; 801. Operating hole detection hole; 9. Contact channel detection shaft; 901. Small diameter detection section; 902. Insertion section; 903. First lightening hole; 10. Bushing; 1001. Large diameter detection section; 1002. Insertion hole; 11. Operating hole detection shaft; 1101. Avoidance structure; 1102. Operating hole detection section; 1103. Second lightening hole. DETAILED DESCRIPTION

[0040] In order to solve the problems in the background technology, the core inventive concept of the present utility model is: using simulated installation instead of dimensional measurement, using limit seats, annular protrusion detection holes and mounting hole detection parts to limit and support the cast conductor, and using the operating hole detection shaft in the set position to detect the size of the operating hole and its relative position with other structures, and using the contact channel detection assembly in the set position to detect the size of the contact channel and its relative position with other structures. There is no need to establish a three-coordinate coordinate system, which is convenient for staff to detect cast conductors.

[0041] The present invention is further described in detail below with reference to the embodiments.

[0042] Specific embodiments of the cast conductor detection tool provided by the utility model:

[0043] In reference Figures 1 to 5 On the basis of Figures 6 to 13 As shown, as a basic specific implementation method of the first category, the cast conductor detection tooling includes a limiting structure for limiting the cast conductor 1, a contact channel detection assembly for detecting the size of the contact channel 101 and an operating hole detection shaft 11 for detecting the size of the operating hole 102; the limiting structure includes a limiting seat for supporting the cast conductor 1, an annular protrusion detection hole 602 for inserting the annular protrusion 103 and four mounting hole detection pieces 603 for inserting into different mounting holes 104, the annular protrusion detection hole 602 and the mounting hole detection piece 603 are both arranged on the limiting seat, and the limiting seat is also provided with an operating hole detection hole 801 for limiting the operating hole detection shaft 11 and a contact channel detection hole 701 for limiting the contact channel detection assembly.

[0044] In a preferred embodiment of Class 1-1, Figures 6-8 As shown, the mounting hole detection member 603 is detachably mounted on the limit seat, and the mounting hole detection member 603 is used to be mounted on the limit seat after the cast conductor 1 is mounted on the limit seat. Specifically, the limit seat is provided with a detection member mounting hole 601, and the mounting hole detection member 603 is detachably mounted in the detection member mounting hole 601.

[0045] Preferably, the mounting hole detection member 603 is a bolt, but may also be a column, a cylinder or other structures.

[0046] When inspecting the cast conductor 1 using the 1-1 embodiment, the cast conductor 1 can first be installed on the stopper. At this point, it is only necessary to align the annular protrusion 103 with the annular protrusion detection hole 602, making installation easy. Then, the mounting hole detection members 603 are installed one by one in the mounting hole 104 and the detection member mounting hole 601, making installation easy. When the mounting hole detection members 603 are bolts, the bolt heads are located at the bottom, and the bolt heads are installed from top to bottom into the detection member mounting hole 601.

[0047] In the specific embodiment of class 1-2, if Figure 13 As shown, the mounting hole detection member 603 is fixedly mounted on the limit seat, or the mounting hole detection member 603 and the limit seat are integrally formed. In this case, when installing the cast conductor 1, it is necessary to align the four mounting hole detection members 603 with the mounting holes 104 while aligning the annular protrusion 103 with the annular protrusion detection hole 602.

[0048] In the present invention, the cast conductor 1 is tested by means of simulated installation. When testing the cast conductor 1, the following steps can be followed:

[0049] Step S1: Insert the annular protrusion 103 of the cast conductor 1 into the annular protrusion detection hole 602, and insert the four mounting hole detection members 603 into different mounting holes 104, respectively, to ensure that the cast conductor 1 can be properly installed on the pot-type insulator 5. If the cast conductor 1 can be properly installed, it is proved that the dimensions of the annular protrusion 103 and the mounting hole 104 are qualified, and the relative position relationship between the annular protrusion 103 and the mounting hole 104 is qualified. If the cast conductor 1 cannot be properly installed, it is proved that the cast conductor 1 is unqualified.

[0050] Step S2: Because the limit seat supports the cast conductor 1, and the four mounting holes 104 and the annular protrusion detection hole 602 limit the position of the cast conductor 1, the contact channel 101 and the operating hole 102 of the cast conductor 1 are in a specific position (i.e., the contact channel 101, the operating hole 102, the mounting hole 104, and the annular protrusion 103 have a specific positional relationship). At this time, the contact channel detection hole 701 is used to limit the contact channel detection assembly, and the contact channel detection assembly is installed on the contact channel 101. If the contact channel detection assembly can be properly installed on the contact channel 101, it is confirmed that the size of the contact channel 101 and the relative positional relationship with the annular protrusion 103 are qualified. If the contact channel detection assembly cannot be properly installed, it is confirmed that the cast conductor 1 is unqualified.

[0051] At the same time, the operating hole detection hole 801 is used to limit the operating hole detection shaft 11, and the operating hole detection shaft 11 is installed on the operating hole 102. If the operating hole detection shaft 11 can be normally installed on the operating hole 102, it proves that the size of the operating hole 102 and the relative position relationship with the annular protrusion 103 are qualified. On the basis that the contact channel 101 is qualified, the position relationship between the contact channel 101 and the operating hole 102 is also qualified. If the operating hole detection shaft 11 cannot be installed normally, it proves that the cast conductor 1 is unqualified.

[0052] In any of the above steps, the length of the contact channel 101 and the length of the operating hole 102 are measured with a ruler or other means to determine whether the lengths of the contact channel 101 and the operating hole 102 are qualified.

[0053] When all the above-mentioned measurement data are qualified, the cast conductor 1 is proved to be qualified. In the above-mentioned measurement process, the method of mounting the cast conductor 1 on the cast conductor detection fixture can conveniently detect the data of the cast conductor 1 that are difficult to measure. After that, only simple length dimensions need to be measured using a ruler or other means. During the entire detection process, there is no need to establish a three-coordinate coordinate system, which can effectively reduce the burden on the staff, save time and effort, and the staff only needs to measure a small amount of data, which can effectively reduce human errors and improve the accuracy of the detection results.

[0054] In specific embodiments of categories 1-3, an avoidance structure 1101 is provided on the operating hole detection shaft 11 and / or the contact channel detection assembly so that the operating hole detection shaft 11 and the contact channel detection assembly can be installed on the same cast conductor 1 at the same time. The avoidance structure 1101 can avoid interference between the operating hole detection shaft 11 and the contact channel detection assembly.

[0055] In the specific implementation manner of category 1-3-1, the operating hole detection shaft 11 includes a semi-cylindrical section and cylindrical sections located at both ends of the semi-cylindrical section. The semi-cylindrical section constitutes the avoidance structure 1101, and the cylindrical section constitutes the operating hole detection section 1102 for detecting the operating hole 102, and the structure is simple.

[0056] In the specific implementation of type 1-3-2, the contact channel detection assembly includes a semi-cylindrical section, which constitutes the avoidance structure 1101.

[0057] In the specific implementation manner of type 1-3-3, avoidance grooves are provided on both the contact channel detection assembly and the operating hole detection shaft 11 , and the two avoidance grooves together constitute the avoidance structure 1101 .

[0058] In the present invention, the reason why the avoidance structure 1101 needs to be provided is that the moving contact 2 is in meshing contact with the gear shaft 3, so the sum of the aperture of the operating hole 102 and the smaller aperture r in the middle of the contact channel 101 is greater than the length of the line connecting the center of the contact channel 101 to the center of the operating hole 102. Therefore, it is necessary to provide the avoidance structure 1101 on the contact channel detection component and / or the operating hole detection shaft 11 to avoid interference between the contact channel detection component and the operating hole detection shaft 11.

[0059] In the present invention, there is no limitation on the specific shape of the avoidance structure 1101 , as long as it can avoid the interference between the contact channel detection component and the operating hole detection shaft 11 .

[0060] When the cast conductor detection tooling in the first to third embodiments is used to detect the cast conductor 1 , in step S2 , the operating hole detection shaft 11 and the contact channel detection assembly can be simultaneously installed on the same cast conductor 1 .

[0061] In the first to fourth types of specific implementations, no avoidance structure 1101 is provided on the operating hole detection shaft 11 and the contact channel detection assembly.

[0062] When using the cast conductor detection tooling in the first to fourth embodiments to detect the cast conductor 1, in step S2, it is necessary to first install one of the operating hole detection shaft 11 and the contact channel detection assembly on the cast conductor 1, then remove it and install the other one on the cast conductor 1.

[0063] In order to simplify the structure, the structure of the contact channel detection assembly is defined as follows in this utility model:

[0064] In the specific embodiment of category 2-1, refer to Figures 9 and 10As shown, the contact channel detection assembly includes a contact channel detection shaft 9 and a sleeve 10 detachably mounted on one end of the contact channel detection shaft 9. The sleeve 10 has a large-diameter detection section 1001 for detecting a larger aperture R at the end of the contact channel 101. The end of the contact channel detection shaft 9 away from the sleeve 10 has a large-diameter detection section 1001 for detecting a larger aperture R at the end of the contact channel 101. The middle part of the contact channel detection shaft 9 has a small-diameter detection section 901 for detecting a smaller aperture r in the middle part of the contact channel 101. The structure is simple.

[0065] In the specific embodiment of Class 2-2, if Figures 9 and 10 As shown, the contact channel detection assembly includes a contact channel detection shaft 9 and two sleeves 10 detachably mounted on both ends of the contact channel detection shaft 9. Each sleeve 10 has a large-diameter detection section 1001 for detecting the larger aperture R at the end of the contact channel 101. The middle portion of the contact channel detection shaft 9 has a small-diameter detection section 901 for detecting the smaller aperture r in the middle portion of the contact channel 101. The structure is simple.

[0066] In the specific embodiments of category 2-1 and category 2-2, the contact channel detection shaft 9 has an inserting section 902 , and the shaft sleeve 10 has a socket 1002 .

[0067] In the specific embodiments of category 2-3, refer to Figures 9 and 10 As shown, the contact channel detection assembly includes two contact channel detection shafts 9 that are plugged into each other. The portion of each contact channel detection shaft 9 close to the other contact channel detection shaft 9 has a small-diameter detection section 901 for detecting the smaller aperture r in the middle of the contact channel 101. The end of each contact channel detection shaft 9 away from the other contact channel detection shaft 9 has a large-diameter detection section 1001 for detecting the larger aperture R at the end of the contact channel 101. The structure is simple.

[0068] Preferably, one of the contact channel detection shafts 9 is provided with a plug, and the other contact channel detection shaft 9 is provided with a slot.

[0069] In the present invention, the specific structure of the contact channel detection assembly is not limited. The essence of the contact channel detection assembly is: a structure that is thinner in the middle and thicker at both ends, and this structure needs to be installed in a channel that is thinner in the middle and thicker at both ends, so the contact channel detection assembly includes at least two detachable parts.

[0070] In the present invention, although a ruler can be used to directly measure the length of the operating hole 102 and the contact channel 101, this also requires an additional ruler, which is more troublesome to measure. Based on this, the present invention makes the following improvements to the method of measuring the length of the operating hole 102 and the contact channel 101:

[0071] In the third embodiment, the operating hole detection shaft 11 and the contact channel detection assembly are provided with a scale, and the operating hole detection shaft 11 and the contact channel detection assembly can be directly used to detect the length of the operating hole 102 and the contact channel 101 without the need for an additional ruler.

[0072] In the specific implementation manner of category 4-1, two operating hole detection parts 8 are provided on the limit seat, and each operating hole detection part 8 is provided with the above-mentioned operating hole detection hole 801. The distance between the two operating hole detection parts 8 is used to match the length of the operating hole 102. At this time, after the cast conductor 1 is installed on the limit seat, whether the length of the operating hole 102 is qualified can be judged by observing whether the operating hole detection part 8 is adjacent to the operating hole 102.

[0073] In the specific implementation manner of category 4-2, two contact channel detection parts 7 are provided on the limit seat, and each contact channel detection part 7 is provided with the contact channel detection hole 701. The distance between the two contact channel detection parts 7 is used to match the length of the contact channel 101. At this time, after the cast conductor 1 is installed on the limit seat, whether the length of the contact channel 101 is qualified can be judged by observing whether the contact channel detection part 7 is adjacent to the contact channel 101.

[0074] In the specific implementation manner of category 4-3, two of the operating hole detection parts 8 and two of the contact channel detection parts 7 are simultaneously provided on the limit seat. After the cast conductor 1 is installed on the limit seat, by observing the distance between the contact channel detection part 7 and the contact channel 101 and the distance between the operating hole detection part 8 and the operating hole 102 at the same time, it is possible to conveniently judge whether the lengths of the contact channel 101 and the operating hole 102 are qualified.

[0075] Preferably, the limit seat includes a bottom plate 6 and four vertical plates. The four vertical plates are divided into two groups and respectively constitute a contact channel detection portion 7 and an operating hole detection portion 8.

[0076] In the specific embodiments of Class 4-1, Class 4-2 and Class 4-3, preferably, the mounting hole detection member 603 is detachably mounted on the limit seat. Compared with the technical solution in which the mounting hole detection member 603 is fixed on the limit seat, the cast conductor 1 can be conveniently mounted on the limit seat.

[0077] To reduce the weight of the contact channel detection assembly, a first weight-reducing hole 903 is further provided on the contact channel detection assembly; to reduce the weight of the operating hole detection shaft 11, a second weight-reducing hole 1103 is further provided on the operating hole detection shaft 11.

[0078] It should be noted that the classification of embodiments in this utility model based only on specific structures does not mean that other categories do not contain the same specific features. For example, the structure of the embodiment in category 1 may be the same as that of the embodiment in category 2 or category 3.

[0079] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without creative effort, or replace some of the technical features therein with equivalents, or organically combine different types of specific implementations to form the attached invention. Figures 6 to 13 The two specific implementation methods are given in the figure. Of course, those skilled in the art can also combine other specific implementation methods not shown in the drawings. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this utility model shall be included in the scope of protection of this utility model.

Claims

1. A casting conductor detection tool, characterized in that: It includes a limiting structure for limiting the cast conductor, a contact channel detection assembly for detecting the size of the contact channel and an operating hole detection shaft for detecting the size of the operating hole; the limiting structure includes a limiting seat for supporting the cast conductor, an annular protrusion detection hole for inserting the annular protrusion and four mounting hole detection pieces for inserting into different mounting holes. The annular protrusion detection hole and the mounting hole detection piece are both arranged on the limiting seat. The limiting seat is also provided with an operating hole detection hole for limiting the operating hole detection shaft and a contact channel detection hole for limiting the contact channel detection assembly.

2. The cast conductor detection tool according to claim 1, characterized in that: The contact channel detection assembly includes a contact channel detection shaft and a sleeve detachably mounted on one end of the contact channel detection shaft, the sleeve having a large-diameter detection section for detecting a larger aperture R at the end of the contact channel, the end of the contact channel detection shaft away from the sleeve having a large-diameter detection section for detecting a larger aperture R at the end of the contact channel, and the middle part of the contact channel detection shaft having a small-diameter detection section for detecting a smaller aperture r in the middle part of the contact channel.

3. The cast conductor detection tool according to claim 1, characterized in that: The contact channel detection assembly includes a contact channel detection shaft and two sleeves detachably mounted at both ends of the contact channel detection shaft. Each sleeve has a large-diameter detection section for detecting the larger aperture R at the end of the contact channel, and the middle of the contact channel detection shaft has a small-diameter detection section for detecting the smaller aperture r in the middle of the contact channel.

4. The cast conductor detection tool according to claim 1, characterized in that: The contact channel detection assembly includes two contact channel detection shafts that are plugged into each other. The part of each contact channel detection shaft close to the other contact channel detection shaft has a small-diameter detection section for detecting the smaller aperture r in the middle of the contact channel, and the end of each contact channel detection shaft away from the other contact channel detection shaft has a large-diameter detection section for detecting the larger aperture R at the end of the contact channel.

5. The cast conductor detection tool according to any one of claims 1 to 4, characterized in that: The limit seat is provided with two operating hole detection parts, each of which is provided with the operating hole detection hole, and the distance between the two operating hole detection parts is used to match the length of the operating hole.

6. The cast conductor detection tool according to any one of claims 1 to 4, characterized in that: The limit seat is provided with two contact channel detection parts, each of which is provided with the contact channel detection hole, and the distance between the two contact channel detection parts is used to match the length of the contact channel.

7. The cast conductor detection tool according to claim 6, characterized in that: The limit seat is provided with two operating hole detection parts, each of which is provided with the operating hole detection hole, and the distance between the two operating hole detection parts is used to match the length of the operating hole.

8. The cast conductor detection tool according to claim 7, characterized in that: The mounting hole detection piece is detachably mounted on the limiting seat, and the mounting hole detection piece is used to be mounted on the limiting seat after the cast conductor is mounted on the limiting seat.

9. The cast conductor detection tool according to any one of claims 1 to 4, characterized in that: The mounting hole detection piece is detachably mounted on the limiting seat, and the mounting hole detection piece is used to be mounted on the limiting seat after the cast conductor is mounted on the limiting seat.

10. The cast conductor detection tool according to any one of claims 1 to 4, characterized in that: An avoidance structure is provided on the operating hole detection shaft and / or the contact channel detection assembly, so that the operating hole detection shaft and the contact channel detection assembly can be installed on the same cast conductor at the same time.

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