Automatic detection device for single-shot vacancy of basic detonator

The basic detonator single-shot empty space automatic detection device uses cylinders and displacement sensors for automatic measurement, which solves the problem of operator contact with detonator chemicals, achieves high safety and consistent empty space detection, and improves production efficiency.

CN223940121UActive Publication Date: 2026-02-24XIAN QINGHUA CIVIL BLASTING EQUIP CO LTD
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Patent Information

Application Number
CN202520548620.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-03-27
Publication Date
2026-02-24
Estimated Expiration
2035-03-27

AI Technical Summary

Technical Problem

In the current basic detonator production, void detection requires operators to directly contact the detonator chemicals for measurement, which poses safety hazards and results in poor measurement consistency.

Method used

The basic detonator single-shot empty position automatic detection device includes a first reciprocating drive mechanism, a vertical plate, a displacement sensor and a conductive measuring rod. It performs automatic measurement by being driven by a cylinder, replacing manual operation.

Benefits of technology

It achieves automated detection with high security and measurement consistency, reduces human error, and improves work efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a basic detonator single-shot vacancy automatic detection device, which comprises a first reciprocating driving mechanism and a vertical plate, a product carrier is fixed at the driving end of the first reciprocating driving mechanism, the vertical plate is arranged beside the first reciprocating driving mechanism, a second reciprocating driving mechanism is fixed on the vertical plate, and the second reciprocating driving mechanism is fixed on the vertical plate. A displacement sensor is fixed to the driving end of the second reciprocating driving mechanism, and the lower end of the displacement sensor is connected with a conductive measuring rod. According to the basic detonator single-shot vacancy automatic detection device, an operator does not need to be in direct contact with a detonator medicament, the safety is good, the automation level of basic detonator vacancy detection is also greatly improved, and the product quality is ensured.
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Description

Technical Field

[0001] This utility model belongs to the technical field of measuring equipment for the empty space distance of a basic detonator casing, specifically relating to an automatic detection device for single empty space of a basic detonator. Background Technology

[0002] Vacancy detection is a crucial step in the basic detonator production process, but also a relatively low-tech step. The detonator casing requires three loading and three pressurization processes. To assess the quality and stability of the loading process, the distance above the casing needs to be measured. If manual measurement is still used, direct contact between personnel and hazardous chemicals poses a safety hazard, and the consistency of measurements is susceptible to human error, resulting in low product quality assurance. Therefore, an automatic detection device is used to measure the vacancy distance above the casing, ensuring operational safety and consistent measurement standards. Utility Model Content

[0003] The purpose of this invention is to provide an automatic single-shot void detection device for basic detonators, which solves the problems of safety hazards and poor measurement consistency in the existing basic detonator production quality inspection, where void detection requires operators to directly contact the detonator agent.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a basic detonator single-shot vacancy automatic detection device, including a first reciprocating drive mechanism and a vertical plate. The drive end of the first reciprocating drive mechanism is fixed with a product carrier. The vertical plate is arranged on the side of the first reciprocating drive mechanism. A second reciprocating drive mechanism is fixed on the vertical plate. A displacement sensor is fixed to the drive end of the second reciprocating drive mechanism. A conductive measuring rod is connected to the lower end of the displacement sensor.

[0005] The technical solution of this utility model also has the following characteristics:

[0006] It also includes a base, a first reciprocating drive mechanism, and an upright plate fixed on the base.

[0007] The first connecting plate is fixed to the drive end of the first reciprocating drive mechanism, and the product carrier is fixed to the first connecting plate.

[0008] A second connecting plate is fixed on the upright plate, and a second reciprocating drive mechanism is fixed on the second connecting plate.

[0009] The drive end of the second reciprocating drive mechanism is fixed with a sensor mounting bracket, and the displacement sensor is fixed on the sensor mounting bracket.

[0010] The lower end of the displacement sensor is connected to the conductive measuring rod via a double-headed locking bolt.

[0011] A guide bracket is fixed to the side of the upright plate, and a hole is fixed on the guide bracket. The lower end of the conductive measuring rod passes through the hole.

[0012] Both the first and second reciprocating drive mechanisms are cylinders.

[0013] The beneficial effects of this utility model are: The basic detonator single-shot empty space automatic detection device of this utility model automatically detects empty space by means of cylinder, displacement sensor, guide bracket and conductive measuring rod, realizing the use of machine operation to replace manual measurement of empty space distance above the basic detonator, ensuring the safety of the production process, reducing human measurement errors and improving work efficiency. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of a basic detonator single-shot vacancy automatic detection device according to this utility model.

[0015] In the figure, 1. base, 2. first reciprocating drive mechanism, 3. first connecting plate, 4. product carrier, 5. guide bracket, 6. conductive measuring rod, 7. double-headed locking bolt, 8. displacement sensor, 9. sensor fixing bracket, 10. second connecting plate, 11. second reciprocating drive mechanism, 12. upright plate. Detailed Implementation

[0016] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Example 1

[0018] like Figure 1 As shown, this utility model discloses a basic detonator single-shot vacancy automatic detection device, comprising a first reciprocating drive mechanism 2 and a vertical plate 12. A product carrier 4 is fixed to the drive end of the first reciprocating drive mechanism 2. The vertical plate 12 is arranged beside the first reciprocating drive mechanism 2, and a second reciprocating drive mechanism 11 is fixed to the vertical plate 12. A displacement sensor 8 is fixed to the drive end of the second reciprocating drive mechanism 11, and a conductive measuring rod 6 is connected to the lower end of the displacement sensor 8. The drive end of the first reciprocating drive mechanism 2 is horizontally arranged, and the drive end of the second reciprocating drive mechanism 11 is vertically arranged.

[0019] The working principle of this utility model is as follows:

[0020] First, the base detonator to be tested is placed on the product carrier 4. Then, the first reciprocating drive mechanism 2 is started to adjust the position of the product carrier 4, aligning the hole in the base detonator's casing with the conductive measuring rod 6. At this time, the second reciprocating drive mechanism 11 is started, driving the displacement sensor 8 and the conductive measuring rod 6 to work. The conductive measuring rod 6 automatically measures the empty distance inside the base detonator's casing, completing the empty detection work in the base detonator production process.

[0021] Example 2

[0022] like Figure 1 As shown in Embodiment 1, Embodiment 2, a basic detonator single-shot vacancy automatic detection device of this utility model, also includes a first reciprocating drive mechanism 2 and a vertical plate 12. A product carrier 4 is fixed to the drive end of the first reciprocating drive mechanism 2. The vertical plate 12 is arranged beside the first reciprocating drive mechanism 2, and a second reciprocating drive mechanism 11 is fixed on the vertical plate 12. A displacement sensor 8 is fixed to the drive end of the second reciprocating drive mechanism 11, and a conductive measuring rod 6 is connected to the lower end of the displacement sensor 8. The drive end of the first reciprocating drive mechanism 2 is arranged horizontally, and the drive end of the second reciprocating drive mechanism 11 is arranged vertically.

[0023] like Figure 1 As shown, unlike Embodiment 1, in this Embodiment 2, the basic detonator single-shot empty automatic detection device of this utility model also includes a base 1, a first reciprocating drive mechanism 2 and a vertical plate 12 fixed on the base 1.

[0024] The base 1 serves as a working reference platform for mounting the first reciprocating drive mechanism 2 and the upright plate 12. The first reciprocating drive mechanism 2 and the upright plate 12 are fixed to the base 1 with bolts, which ensures good stability during operation.

[0025] Example 2: The working principle of the basic detonator single-shot vacancy automatic detection device of this utility model is as follows:

[0026] First, the base detonator to be tested is placed on the product carrier 4. Then, the first reciprocating drive mechanism 2 is started to adjust the position of the product carrier 4, aligning the hole in the base detonator's casing with the conductive measuring rod 6. At this time, the second reciprocating drive mechanism 11 is started, driving the displacement sensor 8 and the conductive measuring rod 6 to work. The conductive measuring rod 6 automatically measures the empty distance inside the base detonator's casing, completing the empty detection work in the base detonator production process.

[0027] Example 3

[0028] like Figure 1As shown in Embodiment 2, Embodiment 3, a basic detonator single-shot empty space automatic detection device of this utility model, also includes a first reciprocating drive mechanism 2, a vertical plate 12, and a base 1. A product carrier 4 is fixed to the drive end of the first reciprocating drive mechanism 2. The vertical plate 12 is arranged beside the first reciprocating drive mechanism 2, and a second reciprocating drive mechanism 11 is fixed to the vertical plate 12. A displacement sensor 8 is fixed to the drive end of the second reciprocating drive mechanism 11, and a conductive measuring rod 6 is connected to the lower end of the displacement sensor 8. The drive end of the first reciprocating drive mechanism 2 is horizontally arranged, and the drive end of the second reciprocating drive mechanism 11 is vertically arranged. The first reciprocating drive mechanism 2 and the vertical plate 12 are fixed to the base 1.

[0029] like Figure 1 As shown, unlike Embodiment 2, in Embodiment 3, a basic detonator single-shot empty automatic detection device of this utility model has a first connecting plate 3 fixed at the drive end of the first reciprocating drive mechanism 2, and a product carrier 4 fixed on the first connecting plate 3.

[0030] To facilitate the assembly of the product carrier 4, a first connecting plate 3 can be installed on the drive end of the first reciprocating drive mechanism 2, and then the product carrier 4 can be fixed on the first connecting plate 3. This design allows the product carrier 4 to be easily installed on the drive end of the first reciprocating drive mechanism 2, avoiding the need for direct connection between the product carrier 4 and the drive end of the first reciprocating drive mechanism 2, which would require modification of the drive end of the first reciprocating drive mechanism 2 to complete the assembly.

[0031] Example 3: The working principle of the basic detonator single-shot vacancy automatic detection device of this utility model is as follows:

[0032] First, the base detonator to be tested is placed on the product carrier 4. Then, the first reciprocating drive mechanism 2 is started to adjust the position of the product carrier 4, aligning the hole in the base detonator's casing with the conductive measuring rod 6. At this time, the second reciprocating drive mechanism 11 is started, driving the displacement sensor 8 and the conductive measuring rod 6 to work. The conductive measuring rod 6 automatically measures the empty distance inside the base detonator's casing, completing the empty detection work in the base detonator production process.

[0033] Example 4

[0034] like Figure 1As shown in Embodiment 3, Embodiment 4, a basic detonator single-shot empty space automatic detection device of this utility model, also includes a first reciprocating drive mechanism 2, a vertical plate 12, and a base 1. A product carrier 4 is fixed to the drive end of the first reciprocating drive mechanism 2. The vertical plate 12 is arranged beside the first reciprocating drive mechanism 2, and a second reciprocating drive mechanism 11 is fixed to the vertical plate 12. A displacement sensor 8 is fixed to the drive end of the second reciprocating drive mechanism 11, and a conductive measuring rod 6 is connected to the lower end of the displacement sensor 8. The drive end of the first reciprocating drive mechanism 2 is horizontally arranged, and the drive end of the second reciprocating drive mechanism 11 is vertically arranged. The first reciprocating drive mechanism 2 and the vertical plate 12 are fixed to the base 1. A first connecting plate 3 is fixed to the drive end of the first reciprocating drive mechanism 2, and the product carrier 4 is fixed to the first connecting plate 3.

[0035] like Figure 1 As shown, unlike Embodiment 3, in Embodiment 4, a basic detonator single-shot empty automatic detection device of this utility model has a second connecting plate 10 fixed on the upright plate 12, and a second reciprocating drive mechanism 11 fixed on the second connecting plate 10.

[0036] The second reciprocating drive mechanism 11 is fixed to the upright plate 12 by the second connecting plate 10, which can ensure that the second reciprocating drive mechanism 11 is stably installed and has good stability when working, and is not easy to shake.

[0037] Example 4: The working principle of the basic detonator single-shot vacancy automatic detection device of this utility model is as follows:

[0038] First, the base detonator to be tested is placed on the product carrier 4. Then, the first reciprocating drive mechanism 2 is started to adjust the position of the product carrier 4, aligning the hole in the base detonator's casing with the conductive measuring rod 6. At this time, the second reciprocating drive mechanism 11 is started, driving the displacement sensor 8 and the conductive measuring rod 6 to work. The conductive measuring rod 6 automatically measures the empty distance inside the base detonator's casing, completing the empty detection work in the base detonator production process.

[0039] Example 5

[0040] like Figure 1As shown in Embodiment 3, Embodiment 4, a basic detonator single-shot empty space automatic detection device of this utility model, also includes a first reciprocating drive mechanism 2, a vertical plate 12, and a base 1. A product carrier 4 is fixed to the drive end of the first reciprocating drive mechanism 2. The vertical plate 12 is arranged beside the first reciprocating drive mechanism 2, and a second reciprocating drive mechanism 11 is fixed to the vertical plate 12. A displacement sensor 8 is fixed to the drive end of the second reciprocating drive mechanism 11, and a conductive measuring rod 6 is connected to the lower end of the displacement sensor 8. The drive end of the first reciprocating drive mechanism 2 is horizontally arranged, and the drive end of the second reciprocating drive mechanism 11 is vertically arranged. The first reciprocating drive mechanism 2 and the vertical plate 12 are fixed to the base 1. A first connecting plate 3 is fixed to the drive end of the first reciprocating drive mechanism 2, and the product carrier 4 is fixed to the first connecting plate 3. A second connecting plate 10 is fixed to the vertical plate 12, and the second reciprocating drive mechanism 11 is fixed to the second connecting plate 10.

[0041] like Figure 1 As shown, unlike Embodiment 4, in Embodiment 5, a basic detonator single-shot empty automatic detection device of this utility model has a sensor mounting bracket 9 fixed at the drive end of the second reciprocating drive mechanism 11, and the displacement sensor 8 is fixed on the sensor mounting bracket 9.

[0042] The displacement sensor 8 is fixed to the drive end of the second reciprocating drive mechanism 11 by the sensor mounting bracket 9. On the one hand, this ensures a stable transmission connection between the displacement sensor 8 and the drive end of the second reciprocating drive mechanism 11 so that the second reciprocating drive mechanism 11 can drive the sensor. On the other hand, it avoids direct connection between the displacement sensor 8 and the drive end of the second reciprocating drive mechanism 11, which would require modification of the drive end of the second reciprocating drive mechanism 11 to complete the assembly between the two.

[0043] Example 5: The working principle of the basic detonator single-shot vacancy automatic detection device of this utility model is as follows:

[0044] First, the base detonator to be tested is placed on the product carrier 4. Then, the first reciprocating drive mechanism 2 is started to adjust the position of the product carrier 4, aligning the hole in the base detonator's casing with the conductive measuring rod 6. At this time, the second reciprocating drive mechanism 11 is started, driving the displacement sensor 8 and the conductive measuring rod 6 to work. The conductive measuring rod 6 automatically measures the empty distance inside the base detonator's casing, completing the empty detection work in the base detonator production process.

[0045] Example 6

[0046] like Figure 1As shown in Embodiment 3, Embodiment 4, a basic detonator single-shot empty space automatic detection device of this utility model, also includes a first reciprocating drive mechanism 2, a vertical plate 12, and a base 1. A product carrier 4 is fixed to the drive end of the first reciprocating drive mechanism 2. The vertical plate 12 is arranged beside the first reciprocating drive mechanism 2, and a second reciprocating drive mechanism 11 is fixed to the vertical plate 12. A displacement sensor 8 is fixed to the drive end of the second reciprocating drive mechanism 11, and a conductive measuring rod 6 is connected to the lower end of the displacement sensor 8. The drive end of the first reciprocating drive mechanism 2 is horizontally arranged, and the drive end of the second reciprocating drive mechanism 11 is vertically arranged. The first reciprocating drive mechanism 2 and the vertical plate 12 are fixed to the base 1. A first connecting plate 3 is fixed to the drive end of the first reciprocating drive mechanism 2, and the product carrier 4 is fixed to the first connecting plate 3. A second connecting plate 10 is fixed to the vertical plate 12, and the second reciprocating drive mechanism 11 is fixed to the second connecting plate 10. A sensor mounting bracket 9 is fixed to the drive end of the second reciprocating drive mechanism 11, and the displacement sensor 8 is fixed to the sensor mounting bracket 9.

[0047] like Figure 1 As shown, unlike Embodiment 5, in Embodiment 6, the lower end of the displacement sensor 8 is connected to the conductive measuring rod 6 via a double-headed locking bolt 7 in a basic detonator single-shot vacancy automatic detection device of this utility model.

[0048] One end of the double-headed locking bolt 7 is connected to the displacement sensor 8, and the other end is connected to the conductive measuring rod 6, making disassembly and assembly relatively convenient.

[0049] Example 6: The working principle of the basic detonator single-shot vacancy automatic detection device of this utility model is as follows:

[0050] First, the base detonator to be tested is placed on the product carrier 4. Then, the first reciprocating drive mechanism 2 is started to adjust the position of the product carrier 4, aligning the hole in the base detonator's casing with the conductive measuring rod 6. At this time, the second reciprocating drive mechanism 11 is started, driving the displacement sensor 8 and the conductive measuring rod 6 to work. The conductive measuring rod 6 automatically measures the empty distance inside the base detonator's casing, completing the empty detection work in the base detonator production process.

[0051] Example 7

[0052] like Figure 1As shown in Embodiment 3, Embodiment 4, a basic detonator single-shot empty space automatic detection device of this utility model, also includes a first reciprocating drive mechanism 2, a vertical plate 12, and a base 1. A product carrier 4 is fixed to the drive end of the first reciprocating drive mechanism 2. The vertical plate 12 is arranged beside the first reciprocating drive mechanism 2, and a second reciprocating drive mechanism 11 is fixed to the vertical plate 12. A displacement sensor 8 is fixed to the drive end of the second reciprocating drive mechanism 11, and a conductive measuring rod 6 is connected to the lower end of the displacement sensor 8. The drive end of the first reciprocating drive mechanism 2 is horizontally arranged, and the drive end of the second reciprocating drive mechanism 11 is vertically arranged. The first reciprocating drive mechanism 2 and the vertical plate 12 are fixed to the base 1. A first connecting plate 3 is fixed to the drive end of the first reciprocating drive mechanism 2, and the product carrier 4 is fixed to the first connecting plate 3. A second connecting plate 10 is fixed to the vertical plate 12, and the second reciprocating drive mechanism 11 is fixed to the second connecting plate 10. A sensor mounting bracket 9 is fixed to the drive end of the second reciprocating drive mechanism 11, and the displacement sensor 8 is fixed to the sensor mounting bracket 9. The lower end of the displacement sensor 8 is connected to the conductive measuring rod 6 by a double-headed locking bolt 7.

[0053] like Figure 1 As shown, unlike Embodiment 6, in Embodiment 7, a basic detonator single-shot vacancy automatic detection device of this utility model has a guide bracket 5 fixed on the side of the upright plate 12, and a hole fixed on the guide bracket 5, through which the lower end of the conductive measuring rod 6 passes.

[0054] Example 7: The working principle of the basic detonator single-shot vacancy automatic detection device of this utility model is as follows:

[0055] First, the base detonator to be tested is placed on the product carrier 4. Then, the first reciprocating drive mechanism 2 is started to adjust the position of the product carrier 4, aligning the hole in the base detonator shell with the hole in the guide bracket. At this time, the second reciprocating drive mechanism 11 is started, driving the displacement sensor 8 and the conductive measuring rod 6 to work. The conductive measuring rod 6 passes through the hole on the guide bracket to automatically measure the empty distance inside the base detonator shell, completing the empty detection work in the base detonator production process.

[0056] Example 8

[0057] like Figure 1As shown in Embodiment 3, Embodiment 4, a basic detonator single-shot empty space automatic detection device of this utility model, also includes a first reciprocating drive mechanism 2, a vertical plate 12, and a base 1. A product carrier 4 is fixed to the drive end of the first reciprocating drive mechanism 2. The vertical plate 12 is arranged beside the first reciprocating drive mechanism 2, and a second reciprocating drive mechanism 11 is fixed to the vertical plate 12. A displacement sensor 8 is fixed to the drive end of the second reciprocating drive mechanism 11, and a conductive measuring rod 6 is connected to the lower end of the displacement sensor 8. The drive end of the first reciprocating drive mechanism 2 is horizontally arranged, and the drive end of the second reciprocating drive mechanism 11 is vertically arranged. The first reciprocating drive mechanism 2 and the vertical plate 12 are fixed to the base 1. A first connecting plate 3 is fixed to the drive end of the first reciprocating drive mechanism 2, and the product carrier 4 is fixed to the first connecting plate 3. A second connecting plate 10 is fixed to the vertical plate 12, and the second reciprocating drive mechanism 11 is fixed to the second connecting plate 10. A sensor mounting bracket 9 is fixed to the drive end of the second reciprocating drive mechanism 11, and the displacement sensor 8 is fixed to the sensor mounting bracket 9. The lower end of the displacement sensor 8 is connected to the conductive measuring rod 6 by a double-headed locking bolt 7. A guide bracket 5 is fixed to the side of the upright plate 12, and a hole is fixed on the guide bracket 5, through which the lower end of the conductive measuring rod 6 passes.

[0058] like Figure 1 As shown, unlike Embodiment 7, in Embodiment 8, the first reciprocating drive mechanism 2 and the second reciprocating drive mechanism 11 of this utility model are both cylinders.

[0059] Both the first reciprocating drive mechanism 2 and the second reciprocating drive mechanism 11 are cylinders, which can ensure sufficient power and, compared with hydraulic cylinders, can maintain a higher level of cleanliness in the working environment and reduce costs.

[0060] Example 8: The working principle of the basic detonator single-shot vacancy automatic detection device of this utility model is as follows:

[0061] First, the base detonator to be tested is placed on the product carrier 4. Then, the first reciprocating drive mechanism 2 is started to adjust the position of the product carrier 4, aligning the hole in the base detonator shell with the hole in the guide bracket. At this time, the second reciprocating drive mechanism 11 is started, driving the displacement sensor 8 and the conductive measuring rod 6 to work. The conductive measuring rod 6 passes through the hole on the guide bracket to automatically measure the empty distance inside the base detonator shell, completing the empty detection work in the base detonator production process.

[0062] Compared with existing technologies, the basic detonator single-shot empty space automatic detection device of this utility model uses a cylinder, displacement sensor, guide bracket and conductive measuring rod to automatically detect empty space, realizes the use of machine operation to replace manual measurement of the empty space distance above the basic detonator, ensures the safety of the production process, reduces human measurement errors and improves work efficiency.

Claims

1. An automatic detection device for single-shot vacancy of a basic detonator, characterized in that, It includes a first reciprocating drive mechanism (2) and a vertical plate (12). The drive end of the first reciprocating drive mechanism (2) is fixed with a product carrier (4). The vertical plate (12) is arranged on the side of the first reciprocating drive mechanism (2). A second reciprocating drive mechanism (11) is fixed on the vertical plate (12). A displacement sensor (8) is fixed on the drive end of the second reciprocating drive mechanism (11). A conductive measuring rod (6) is connected to the lower end of the displacement sensor (8).

2. The basic detonator single-shot vacancy automatic detection device according to claim 1, characterized in that, It also includes a base (1), on which the first reciprocating drive mechanism (2) and the upright plate (12) are fixed.

3. The basic detonator single-shot vacancy automatic detection device according to claim 2, characterized in that, The first reciprocating drive mechanism (2) has a first connecting plate (3) fixed at its drive end, and the product carrier (4) is fixed on the first connecting plate (3).

4. The basic detonator single-shot vacancy automatic detection device according to claim 3, characterized in that, A second connecting plate (10) is fixed on the upright plate (12), and the second reciprocating drive mechanism (11) is fixed on the second connecting plate (10).

5. The basic detonator single-shot vacancy automatic detection device according to claim 1, characterized in that, The second reciprocating drive mechanism (11) has a sensor mounting bracket (9) fixed at its drive end, and the displacement sensor (8) is fixed on the sensor mounting bracket (9).

6. The basic detonator single-shot vacancy automatic detection device according to claim 1, characterized in that, The lower end of the displacement sensor (8) is connected to the conductive measuring rod (6) by a double-headed locking bolt (7).

7. The basic detonator single-shot vacancy automatic detection device according to claim 6, characterized in that, A guide bracket (5) is fixed to the side of the upright plate (12), and a hole is fixed on the guide bracket (5). The lower end of the conductive measuring rod (6) passes through the hole.

8. The basic detonator single-shot vacancy automatic detection device according to claim 1, characterized in that, Both the first reciprocating drive mechanism (2) and the second reciprocating drive mechanism (11) are cylinders.