A probe propulsion mechanism and a double electromagnetic cut-off valve detection device comprising the same

Abstract

The present application relates to valve detection technical field, specifically to a kind of probe propulsion mechanism and the double electromagnetic cut-off valve detection equipment containing the mechanism, including detection table and valve, further including self-adjusting detection component, including two mounting brackets symmetrically slidingly installed on detection table, two mounting brackets are installed with two infrared probes on the outer wall of side close to each other, self-adjusting piece for keeping the distance of two infrared probes and valve core always same is also movably installed on mounting bracket;Positioning adjusting component, including clamping plate slidingly installed on detection table, the sliding direction of clamping plate is perpendicular to the sliding direction of positioning block, when clamping plate extrudes valve, two positioning blocks are mutually close to adjust the angle of valve.The present application is cooperated with self-adjusting detection component and positioning adjusting component, realizes the automatic centering of double electromagnetic cut-off valve, probe distance self-adapting compensation, completely saves the operation of manual regulating valve position and probe alignment, significantly improves detection efficiency.

Description

Technical Field

[0001] This invention relates to the field of valve testing technology, specifically to a probe propulsion mechanism and a dual electromagnetic shut-off valve testing device containing the mechanism. Background Technology

[0002] This invention relates to the field of valve testing technology, specifically to a probe propulsion mechanism and a dual electromagnetic shut-off valve testing device incorporating this mechanism. Currently, dual electromagnetic shut-off valves, as core safety actuators in pipeline systems, are seeing increasing application scenarios and testing demands. However, existing testing equipment still suffers from significant technical shortcomings. Most testing devices rely on manual operation, requiring operators to repeatedly adjust the valve position to align the probe with the valve core, resulting in extremely low automation.

[0003] The aforementioned testing methods not only heavily rely on human experience, making them prone to inaccurate positioning and poor repeatability due to operational deviations, directly impacting the reliability and accuracy of the test results, but also consume a significant amount of time in the manual adjustment process. This results in lengthy testing cycles for individual devices, hindering efficient batch testing and failing to meet the urgent demands of modern industrial production lines for high-speed and automated component testing. Furthermore, the manual intervention also contributes to the high testing costs. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a probe advancing mechanism and a dual electromagnetic shut-off valve detection device containing the mechanism, which can effectively solve the problem of low detection efficiency caused by manual valve position adjustment in existing technologies.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a probe propulsion mechanism, including a detection stage and a valve, and further comprising: The self-adjusting detection assembly includes two mounting brackets symmetrically slidably mounted on the detection table. Two infrared probes are mounted on the outer wall of the two mounting brackets on the side closest to each other. The mounting brackets also have self-adjusting components movably mounted to keep the distance between the two infrared probes and the valve core always the same. The positioning and adjusting assembly includes a clamp plate slidably mounted on a testing table. The testing table also has two sets of positioning block groups slidably mounted. Each set of positioning block groups includes two symmetrically slidably mounted positioning blocks. The sliding direction of the clamp plate is perpendicular to the sliding direction of the positioning blocks. When the clamp plate presses the valve, the two positioning blocks move closer to each other to adjust the angle of the valve.

[0006] Furthermore, two transverse slides are slidably mounted on the testing platform, and a longitudinal slide is slidably mounted on the transverse slides, with the mounting bracket slidably mounted on the longitudinal slide.

[0007] Furthermore, the valve is a solenoid valve, and two valve cores are movably disposed in the valve. The two infrared probes located on the same side are arranged vertically, and the infrared probe located below is aligned with the bottom end of the valve core when closed.

[0008] Furthermore, a second piston tube is slidably mounted on one side of the mounting bracket, and a second piston rod is movably inserted into the second piston tube. The two infrared probes are fixedly mounted one-to-one at the ends of the second piston rod.

[0009] Furthermore, the self-adjusting component includes two first piston tubes mounted on a mounting bracket. A first piston rod is movably inserted into the first piston tube, and a first connecting pipe connects the first piston tube and the second piston tube. An adjusting rod is fixedly installed at the telescopic end of the first piston rod. The distance difference between the end of the adjusting rod and the end of the infrared probe is kept constant through the flow of the medium between the first piston tube and the second piston tube.

[0010] Furthermore, a universal ball is movably provided at the end of the adjusting rod.

[0011] Furthermore, a first magnet is provided in the first piston tube, and a second magnet is provided on the first piston rod. Both the first magnet and the second magnet are electromagnets, and they repel each other when energized. A trigger switch for activating the first magnet and the second magnet is provided on the detection platform. The trigger switch is pressed when the mounting bracket is away from the valve.

[0012] Furthermore, the positioning adjustment assembly also includes a third piston tube on the outer wall of the mounting frame, a third piston rod is movably inserted into the outer wall of the third piston tube, the clamping plate is fixedly installed on the third piston rod, and a return spring is provided in the third piston tube.

[0013] Furthermore, two fourth piston tubes are symmetrically installed on the testing platform, and a fourth piston rod is movably inserted into one end of each of the two fourth piston tubes. Two positioning blocks are installed on the two fourth piston rods in a corresponding manner, and the positioning blocks are wedge-shaped. Anti-slip grooves are provided on the side of each positioning block near the valve. A second connecting pipe connects the third piston tube and the fourth piston tube.

[0014] Furthermore, the detection station is equipped with a conveyor belt, the valve is placed on the conveyor belt, and the discharge end of the conveyor belt is equipped with a material distribution plate. The material distribution plate rotates counterclockwise or clockwise according to the different results detected by the infrared probe.

[0015] Furthermore, two adjusting plates are symmetrically fixedly installed on the bottom wall of the material distribution plate, and two electric push rods are symmetrically fixedly installed on the bottom wall of the detection table. A transmission rod is fixedly installed at the output end of the electric push rod, and a telescopic rod is fixedly installed at the end of the transmission rod away from the electric push rod. An adjusting groove is provided on the adjusting plate, and the telescopic rod and the adjusting groove are movably connected.

[0016] Furthermore, the adjusting groove is inclined, and a slider is slidably installed in the adjusting groove, with the slider and the end of the telescopic rod hinged together.

[0017] A dual electromagnetic shut-off valve testing device employs the aforementioned probe propulsion mechanism.

[0018] The technical solution provided by this invention has the following advantages compared with the known prior art: This invention utilizes a self-adjusting detection component in conjunction with a positioning adjustment component to achieve automatic centering of the dual electromagnetic shut-off valve and adaptive compensation of the probe distance. This completely eliminates the need for manual adjustment of the valve position and probe alignment, significantly improving detection efficiency. The piston-connecting structure enables synchronized clamping and positioning, ensuring the valve is centered and the valve core and probe are precisely aligned, reducing human error and improving detection consistency and reliability. The self-adjusting structure automatically maintains a constant detection distance between the probe and the valve core, adapting to different valve specifications and offering strong versatility. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is an overall schematic diagram of the present invention; Figure 2 for Figure 1 Enlarged view of the structure of part A in the middle; Figure 3 This is a front view of the present invention; Figure 4 for Figure 2 Enlarged view of the structure of section B; Figure 5 This is a top-view structural diagram of the present invention; Figure 6 This is a side view of the present invention; Figure 7 This is a structural diagram of the adjusting rod and infrared probe section; Figure 8 This is a schematic diagram of the detection process of the present invention.

[0021] The labels in the diagram represent: 1. Detection table; 2. Transverse slide; 3. Longitudinal slide; 4. Mounting frame; 5. Infrared probe; 6. Adjusting rod; 7. First piston tube; 8. First piston rod; 9. Second piston tube; 10. Second piston rod; 11. First connecting pipe; 12. Valve; 13. Third piston tube; 14. Third piston rod; 15. Clamping plate; 16. Fourth piston tube; 17. Fourth piston rod; 18. Positioning block; 19. Second connecting pipe; 20. Conveyor belt; 21. Material distribution plate; 22. Adjusting plate; 23. Adjusting groove; 24. Telescopic rod; 25. Transmission rod; 26. Electric actuator; 27. First magnet; 28. Second magnet. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention.

[0023] The present invention will be further described below with reference to embodiments.

[0024] Example 1:

[0025] refer to Figures 1-3 A probe propulsion mechanism includes a detection platform 1 and a valve 12, and also includes a self-adjusting detection component, including two mounting brackets 4 symmetrically slidably mounted on the detection platform 1. Two transverse slides 2 are slidably mounted on the detection platform 1, and a longitudinal slide 3 is slidably mounted on the transverse slides 2. The mounting brackets 4 are slidably mounted on the longitudinal slides 3. Two infrared probes 5 are mounted on the outer wall of the two mounting brackets 4 that are close to each other. The valve 12 is a solenoid valve, and two valve cores are movably arranged in the valve 12. The two infrared probes 5 located on the same side are arranged vertically, and the infrared probe 5 located below is aligned with the bottom end of the valve core when closed. A second piston tube 9 is slidably mounted on one side of the mounting bracket 4. A second piston rod 10 is movably inserted into the second piston tube 9, and the two infrared probes 5 are fixedly mounted on the ends of the second piston rod 10 in a one-to-one correspondence.

[0026] refer to Figure 7 and Figure 8The mounting bracket 4 also has a self-adjusting component movably mounted to maintain the same distance between the two infrared probes 5 and the valve core of valve 12. The self-adjusting component includes two first piston tubes 7 mounted on the mounting bracket 4. A first piston rod 8 is movably inserted into the first piston tube 7, and a first connecting pipe 11 connects the first piston tube 7 and the second piston tube 9. An adjusting rod 6 is fixedly mounted on the telescopic end of the first piston rod 8. The distance difference between the end of the adjusting rod 6 and the end of the infrared probe 5 is kept the same by the flow of the medium between the first piston tube 7 and the second piston tube 9. A universal ball is movably provided at the end of the adjusting rod 6. A first magnet 27 is provided in the first piston tube 7, and a second magnet 28 is provided on the first piston rod 8. Both the first magnet 27 and the second magnet 28 are electromagnets, and they repel each other when energized. The detection table 1 is provided with a trigger switch for activating the first magnet 27 and the second magnet 28. The trigger switch is pressed when the mounting bracket 4 moves away from the valve 12.

[0027] like Figure 1 As shown, two transverse slides 2 are symmetrically slidably installed on the testing table 1. The transverse slides 2 slide horizontally along the length direction of the testing table 1. A longitudinal slide 3 is slidably installed on the transverse slides 2. The longitudinal slide 3 slides downward along the height direction of the transverse slides 2. A mounting frame 4 is slidably installed on the longitudinal slide 3. The mounting frame 4 slides back and forth along the width direction of the longitudinal slide 3, so that the mounting frame 4 can be finely adjusted in three-dimensional space on the testing table 1.

[0028] Two mounting brackets 4 are symmetrically arranged on both sides of valve 12, with two infrared probes 5 installed on each side facing each other. The two infrared probes 5 on the same side are arranged vertically, with the lower infrared probe 5 aligned with the bottom end of the valve core in the closed position of valve 12, used to detect the valve core's position (e.g., Figure 8 (As shown). The mounting bracket 4 slides to install the second piston tube 9 toward the valve 12. The second piston rod 10 is movably inserted into the second piston tube 9. The two infrared probes 5 are respectively fixed to the protruding ends of the second piston rod 10.

[0029] The mounting bracket 4 is equipped with a self-adjusting component, including two first piston tubes 7. A first piston rod 8 is movably inserted into the first piston tube 7. The first piston tube 7 and the second piston tube 9 are connected by a first connecting pipe 11 to form a closed oil / air passage. An adjusting rod 6 is fixed to the extended end of the first piston rod 8. A universal ball is movably installed at the end of the adjusting rod 6, which can flexibly fit against the outer wall of the valve core.

[0030] When the adjusting rod 6 touches the outer wall of the valve core, the first piston rod 8 retracts into the first piston tube 7, pushing the medium through the first connecting pipe 11 into the second piston tube 9, driving the second piston rod 10 to extend. This ensures that the distance between the end face of the adjusting rod 6 and the end face of the infrared probe 5 remains constant, guaranteeing that the detection distance between the infrared probe 5 and the valve core is consistent, thus achieving probe distance self-compensation. This is to prevent the valve core from tilting during detection, which could lead to errors in the detection time interval.

[0031] Specific testing process: The location of infrared probe 5 is shown below. Figure 8 The infrared probe 5 calculates the time by using the feedback signal from laser contact with the measured point. When there is no contact, the probe emits no infrared feedback signal.

[0032] During testing, for example, when testing valve core 1, adjust infrared probe 4 so that its infrared beam is aimed at the bottom of valve core 1 when it is closed. At this time, the control panel receives a signal. Then adjust infrared probe 3 so that its infrared beam is aimed at the bottom of valve core 1 when it is fully open. At this time, the valve core is not open, and there is no signal feedback. When valve 1 is opened, the feedback signal from probe 1 is lost momentarily, but probe 3 receives the feedback signal from valve core 1. The time difference between the two signals can be used to measure the opening time.

[0033] The closing time is the opposite.

[0034] The delay time is the time difference between energizing and when valve core 1 begins to operate.

[0035] like Figure 7 As shown, the first piston tube 7 contains a first magnet 27, and the first piston rod 8 has a second magnet 28 fixed on it. Both are electromagnets and repel each other when energized. The test table 1 is equipped with a trigger switch. When the mounting bracket 4 moves away from the valve 12 after completing the test, squeezing the trigger switch energizes the two electromagnets, causing them to repel each other and push the first piston rod 8 to extend and reset. This, in turn, drives the second piston rod 10 to reset synchronously, preparing for the next test.

[0036] Example 2:

[0037] refer to Figures 1-3 The positioning and adjusting assembly includes a clamping plate 15 slidably mounted on the testing table 1. Two sets of positioning block groups are also slidably mounted on the testing table 1. Each set of positioning block groups includes two symmetrically slidably mounted positioning blocks 18. The sliding direction of the clamping plate 15 is perpendicular to the sliding direction of the positioning blocks 18. When the clamping plate 15 presses against the valve 12, the two positioning blocks 18 move closer to each other to adjust the angle of the valve 12. The positioning and adjusting assembly also includes a third piston tube 13 on the outer wall of the mounting frame 4. A third piston rod 14 is movably inserted into the outer wall of the third piston tube 13. The clamping plate 15 is fixedly mounted on the third piston rod 14, and a return spring is provided in the third piston tube 13. Two fourth piston tubes 16 are symmetrically mounted on the testing table 1, and a fourth piston rod 17 is movably inserted into the adjacent end of each of the two fourth piston tubes 16. Two positioning blocks 18 are installed one-to-one on the two fourth piston rods 17, and the positioning blocks 18 are wedge-shaped. Anti-slip grooves are provided on the side of each positioning block 18 near the valve 12. A second connecting pipe 19 connects the third piston tube 13 and the fourth piston tube 16.

[0038] like Figure 1 and Figure 5As shown, based on Embodiment 1, this embodiment adds a positioning adjustment component to achieve automatic centering and angle correction of valve 12 without manual adjustment. The positioning adjustment component includes a clamping plate 15 slidably mounted on the detection table 1, and two sets of positioning block groups. Each set of positioning block groups contains two symmetrically sliding positioning blocks 18, and the sliding direction of the clamping plate 15 is perpendicular to the sliding direction of the positioning blocks 18.

[0039] The third piston tube 13 is fixed to the outer wall of the mounting bracket 4. The third piston rod 14 is movably inserted into the third piston tube 13. The clamping plate 15 is fixed to the end of the third piston rod 14. A return spring is provided inside the third piston tube 13. Two fourth piston tubes 16 are symmetrically installed on the testing table 1. The fourth piston rod 17 is movably inserted into the fourth piston tube 16. The positioning block 18 is fixed to the end of the fourth piston rod 17. The positioning block 18 is wedge-shaped and has an anti-slip groove on its inner side. The third piston tube 13 and the fourth piston tube 16 are connected by a second connecting pipe 19.

[0040] When the mounting bracket 4 feeds towards the valve 12, the third piston rod 14 pushes the clamping plate 15 to first contact and laterally clamp the valve 12, pressurizing the medium in the third piston tube 13. This medium then flows synchronously into the two fourth piston tubes 16 via the second connecting pipe 19, pushing the fourth piston rod 17 outwards. This causes the two positioning blocks 18 to simultaneously close towards each other, performing longitudinal centering and angular correction on the valve 12. This automatically aligns the valve core with the infrared probe 5, eliminating positioning deviations caused by manual adjustment. This ensures that the surface of the valve core is as perpendicular as possible to the detection direction of the infrared probe 5, improving detection accuracy. Combined with the aforementioned self-adjusting components, this makes the detection time more precise.

[0041] Example 3:

[0042] refer to Figure 5 The detection platform 1 is equipped with a conveyor belt 20, and a valve 12 is placed on the conveyor belt 20. The discharge end of the conveyor belt 20 is equipped with a material distribution plate 21. The material distribution plate 21 rotates counterclockwise or clockwise according to different results detected by the infrared probe 5. Two adjusting plates 22 are symmetrically fixedly installed on the bottom wall of the material distribution plate 21. Two electric push rods 26 are symmetrically fixedly installed on the bottom wall of the detection platform 1. A transmission rod 25 is fixedly installed at the output end of the electric push rod 26. A telescopic rod 24 is fixedly installed at the end of the transmission rod 25 away from the electric push rod 26. An adjusting groove 23 is opened on the adjusting plate 22. The telescopic rod 24 and the adjusting groove 23 are movably connected. The adjusting groove 23 is inclined, and a slider is slidably installed in the adjusting groove 23. The slider and the end of the telescopic rod 24 are hinged.

[0043] Based on embodiments 1 and 2, this embodiment provides an automated conveying, detection, and sorting mechanism to achieve batch continuous detection and automatic sorting. A conveyor belt 20 is installed inside the detection table 1. Valves 12 are placed sequentially on the conveyor belt 20 and conveyed along the line. After reaching the detection position, the conveyor belt 20 is paused, and the positioning adjustment component completes the centering and clamping. Then, the self-adjusting detection component completes the valve core position detection.

[0044] The discharge end of the conveyor belt 20 is equipped with a material distribution plate 21. Two adjusting plates 22 are symmetrically fixed to the bottom wall of the material distribution plate 21. An inclined adjusting groove 23 is opened on the adjusting plate 22, and a slider is slidably installed in the adjusting groove 23. Two electric push rods 26 are symmetrically fixed to the bottom wall of the detection table 1. A transmission rod 25 is fixed to the output end of the electric push rod 26. A telescopic rod 24 is fixed to the end of the transmission rod 25 away from the electric push rod 26. The end of the telescopic rod 24 is hinged to the slider.

[0045] Infrared sensor 5 uploads the valve core positioning signal to the control system. Based on the pass / fail result, the control system drives the corresponding electric push rod 26 to extend or retract: When the electric push rod 26 extends, the transmission rod 25 pushes the telescopic rod 24 forward, which slides along the adjustment groove 23 through the slider, causing the material distribution plate 21 to deflect clockwise; when the electric push rod 26 retracts, it pulls the telescopic rod 24 backward, causing the material distribution plate 21 to deflect counterclockwise, guiding the passable and unpassable parts to different discharge channels, completing the fully automatic integrated operation of detection, positioning, judgment and sorting.

[0046] It is worth noting that the two electric actuators 26 are driven in opposite directions; that is, when one extends, the other shortens. This makes the material distribution plate 21 more stable. Of course, other driving methods can also be used to complete the above material distribution process. The choice can be made based on cost and actual conditions.

[0047] A dual electromagnetic shut-off valve testing device employs a probe propulsion mechanism.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A probe propulsion mechanism, comprising a detection platform and a valve, characterized in that, Also includes: The self-adjusting detection assembly includes two mounting brackets symmetrically slidably mounted on the detection table. Two infrared probes are mounted on the outer wall of the two mounting brackets on the side closest to each other. The mounting brackets also have self-adjusting components movably mounted to keep the distance between the two infrared probes and the valve core always the same. The positioning and adjusting assembly includes a clamp plate slidably mounted on a testing table. The testing table also has two sets of positioning block groups slidably mounted. Each set of positioning block groups includes two symmetrically slidably mounted positioning blocks. The sliding direction of the clamp plate is perpendicular to the sliding direction of the positioning blocks. When the clamp plate presses the valve, the two positioning blocks move closer to each other to adjust the angle of the valve.

2. The probe propulsion mechanism according to claim 1, characterized in that, Two transverse slides are slidably mounted on the testing platform, and a longitudinal slide is slidably mounted on the transverse slides. The mounting bracket is slidably mounted on the longitudinal slide.

3. The probe propulsion mechanism according to claim 1, characterized in that, The valve is a solenoid valve, and two valve cores are movable in the valve. The two infrared probes located on the same side are arranged vertically, and the infrared probe located below is aligned with the bottom end of the valve core when closed.

4. The probe propulsion mechanism according to claim 1, characterized in that, A second piston tube is slidably mounted on one side of the mounting bracket, and a second piston rod is movably inserted into the second piston tube. The two infrared probes are fixedly installed at the ends of the second piston rod in a one-to-one correspondence.

5. A probe propulsion mechanism according to claim 4, characterized in that, The self-adjusting component includes two first piston tubes mounted on a mounting bracket. A first piston rod is movably inserted into the first piston tube, and a first connecting pipe connects the first piston tube and the second piston tube. An adjusting rod is fixedly installed at the telescopic end of the first piston rod. The distance difference between the end of the adjusting rod and the end of the infrared probe is kept constant through the flow of the medium between the first piston tube and the second piston tube.

6. A probe propulsion mechanism according to claim 5, characterized in that, The end of the adjusting rod is movably equipped with a universal ball.

7. A probe propulsion mechanism according to claim 5, characterized in that, The first piston tube is equipped with a first magnet, and the first piston rod is equipped with a second magnet. Both the first magnet and the second magnet are electromagnets, and they repel each other when energized. The detection platform is equipped with a trigger switch for activating the first magnet and the second magnet. The trigger switch is pressed when the mounting bracket moves away from the valve.

8. A probe propulsion mechanism according to claim 1, characterized in that, The positioning adjustment assembly also includes a third piston tube on the outer wall of the mounting frame, a third piston rod is movably inserted into the outer wall of the third piston tube, the clamp is fixedly installed on the third piston rod, and a return spring is provided in the third piston tube.

9. A probe propulsion mechanism according to claim 8, characterized in that, Two fourth piston tubes are symmetrically installed on the testing platform, and a fourth piston rod is movably inserted into one end of each of the two fourth piston tubes. Two positioning blocks are installed on the two fourth piston rods in a corresponding manner. The positioning blocks are wedge-shaped, and anti-slip grooves are provided on the side of each positioning block near the valve. A second connecting pipe connects the third piston tube and the fourth piston tube.

10. A probe propulsion mechanism according to claim 1, characterized in that, The testing station is equipped with a conveyor belt, the valve is placed on the conveyor belt, and the discharge end of the conveyor belt is equipped with a material distribution plate. The material distribution plate rotates counterclockwise or clockwise according to the different results detected by the infrared probe.

11. A probe propulsion mechanism according to claim 10, characterized in that, Two adjusting plates are symmetrically fixedly installed on the bottom wall of the material distribution plate, and two electric push rods are symmetrically fixedly installed on the bottom wall of the detection table. A transmission rod is fixedly installed at the output end of the electric push rod, and a telescopic rod is fixedly installed at the end of the transmission rod away from the electric push rod. An adjusting groove is provided on the adjusting plate, and the telescopic rod and the adjusting groove are movably connected.

12. A probe propulsion mechanism according to claim 11, characterized in that, The adjusting groove is inclined, and a slider is slidably installed in the adjusting groove. The slider and the end of the telescopic rod are hinged together.

13. A dual electromagnetic shut-off valve testing device, employing the probe propulsion mechanism as described in any one of claims 1-12.

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