Telescopic electroscope

Abstract

The invention discloses a telescopic electroscope, and relates to the technical field of electroscopes, the telescopic electroscope comprises an insulating rod, and the insulating rod comprises a top pipe, a bottom pipe, a connecting pipe and a self-locking mechanism; the outer wall of the connecting pipe is in sliding fit with a middle shaft hole of the bottom pipe, and the self-locking mechanism can allow or prevent the connecting pipe from sliding; a first elastic clamping assembly is installed at the bottom end of the connecting pipe, and a first clamping hole used for being connected with the first elastic clamping assembly in a clamped mode is formed in the top end of the bottom pipe. The outer wall of the top pipe is in sliding fit with a middle shaft hole of the connecting pipe, a second elastic clamping assembly is installed at the bottom end of the top pipe, a second clamping hole used for being connected with the second elastic clamping assembly in a clamped mode is formed in the top end of the connecting pipe, and the top end of the top pipe is fixedly connected with the bottom end of the audible and visual alarm. According to the telescopic electroscope, the connection efficiency can be improved on the basis of improving the connection reliability of large and small pipes.

Description

Technical Field

[0001] The invention relates to the technical field of electroscopes, and in particular to a telescopic electroscope. Background Art

[0002] The electroscope generally includes an audible and visual alarm, a metal contact and an insulating rod. The metal contact is installed at one end of the audible and visual alarm, and the insulating rod is installed at the other end of the audible and visual alarm. In order to facilitate carrying and storage, the insulating rod of the electroscope is usually set to be telescopic, that is, a large tube is sleeved with a small tube. After the insulating rod is stretched, the large and small tube ends are fixed by interference fit.

[0003] However, after long-term use, both the large and small tubes will wear out, resulting in an interference fit between the two, which may cause the two to separate or the small tube to retract.

[0004] Some insulating rods are fixed in sections by segmented threaded connection, and the threaded connection process takes a certain amount of time, which reduces the connection efficiency, such as the patent with announcement number CN218727520U; some insulating rods use a locking method, such as the patent with announcement number CN220795345U, and it takes a certain amount of time to twist the locking sleeve, which reduces the connection efficiency.

[0005] Therefore, it is necessary to develop a telescopic electroscope with reliable connection between large and small tubes and high connection efficiency in view of the above defects. Summary of the invention

[0006] The purpose of the invention is to provide a telescopic electroscope which can improve the connection efficiency while improving the connection reliability of large and small tubes.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] The invention discloses a telescopic electroscope, comprising an audible and visual alarm, wherein a metal contact is arranged at the top of the audible and visual alarm, an insulating rod is fixed at the bottom of the audible and visual alarm, and the insulating rod comprises a top tube, a bottom tube, a connecting tube and a self-locking mechanism;

[0009] The outer wall of the connecting tube is slidably matched with the central axis hole of the bottom tube, the self-locking mechanism is arranged between the connecting tube and the bottom tube, and the self-locking mechanism can allow or prevent the connecting tube from sliding; a first elastic clamping assembly is installed at the bottom end of the connecting tube, the first elastic clamping assembly is located above the self-locking mechanism, and a first clamping hole for clamping with the first elastic clamping assembly is opened at the top end of the bottom tube;

[0010] The outer wall of the top tube is slidably matched with the central axis hole of the connecting tube, a second elastic clamping assembly is installed at the bottom end of the top tube, a second clamping hole for clamping with the second elastic clamping assembly is opened at the top end of the connecting tube, and the top end of the top tube is fixedly connected to the bottom end of the sound and light alarm.

[0011] Preferably, the self-locking mechanism comprises a fixed plate, a fixed rod, a fixed cone, a sliding cone and an elastic telescopic component, the fixed plate is fixedly connected to the bottom end surface of the connecting tube, the fixed rod, the fixed cone and the sliding cone are all coaxially arranged with the bottom tube, the top of the fixed rod is fixedly connected to the bottom surface of the fixed plate, the fixed cone is fixed to the bottom of the fixed rod, the fixed rod slides through the sliding cone, the sliding cone is located between the fixed cone and the fixed plate, the large diameter end of the fixed cone is arranged opposite to the large diameter end of the sliding cone, the diameter of the large diameter end of the fixed cone is smaller than the diameter of the large diameter end of the sliding cone, and the height of the fixed rod is greater than the height of the sliding cone; the elastic telescopic component is fixedly connected to the bottom tube and is located on one side of the fixed rod, the working end of the elastic telescopic component can abut against the end surface of the large diameter end of the fixed cone and the sliding cone can drive the working end of the elastic telescopic component to retract.

[0012] Preferably, the elastic telescopic component includes a first compression spring, a slider and a fixed cylinder, the fixed cylinder is horizontally arranged, the fixed cylinder is fixedly connected to the bottom tube, one end of the slider is located in the fixed cylinder and is slidingly connected to the inner wall of the fixed cylinder, a sealing plate is fixed to the end of the fixed cylinder away from the slider, the first compression spring is arranged between the sealing plate and the slider; a driving surface is provided at the end of the slider close to the fixed rod, the driving surface is a slope inclined downward, and the end of the slope away from the fixed cylinder is the lower end.

[0013] Preferably, a groove is provided on the end surface of the large diameter end of the sliding frustum, and the inner diameter of the groove is greater than or equal to the diameter of the large diameter end of the fixed frustum.

[0014] Preferably, the self-locking mechanism also includes a second compression spring, and the bottom end of the bottom tube is fixedly connected to a limit plate for limiting the second compression spring, the second compression spring is located between the limit plate and the fixed frustum, the top end of the second compression spring is fixedly connected to the small diameter end of the fixed frustum or the bottom end of the second compression spring is fixedly connected to the limit plate.

[0015] Preferably, the first elastic clamping assembly includes a first latch and a third compression spring, the first latch is horizontally arranged and slides through the tube wall of the connecting tube, the first latch is symmetrically provided with two, baffles are fixed on the opposite surfaces of the two first latches, and the two ends of the third compression spring are respectively fixedly connected to the two baffles; the inner diameter of the first clamping hole matches the outer diameter of the first latch, and the first clamping hole penetrates the tube wall of the bottom tube; the length of the first latch is greater than or equal to the sum of the wall thickness of the bottom tube and the connecting tube.

[0016] Preferably, the second elastic clamping assembly includes a second latch and a fourth compression spring, the second latch is horizontally arranged and slides through the tube wall of the top pipe, two second latches are symmetrically provided, and blocks are fixed on the opposite surfaces of the two second latches, and the two ends of the fourth compression spring are respectively fixedly connected to the two blocks; the inner diameter of the second clamping hole matches the outer diameter of the second latch, and the second clamping hole penetrates the tube wall of the top pipe.

[0017] Preferably, it also includes a third clamping hole and a fourth clamping hole, the third clamping hole is opened on the tube wall of the bottom end of the connecting tube and the third clamping hole is located above the first elastic clamping component, and the third clamping hole passes through the tube wall of the connecting tube; the fourth clamping hole is opened on the tube wall of the top end of the bottom tube and the fourth clamping hole is located above the first clamping hole, and the fourth clamping hole passes through the tube wall of the bottom tube, and the second latch is plugged into the third clamping hole; the length of the second latch is greater than or equal to the sum of the wall thicknesses of the bottom tube, the connecting tube and the top tube; the vertical distance between the first clamping hole and the fourth clamping hole is equal to the vertical distance between the third clamping hole and the first clamping pin.

[0018] Preferably, it also includes a first slideway for guiding the first latch and the second latch, the first slideway is opened on the inner wall of the bottom tube, the first slideway is opened along the length direction of the bottom tube, the central axis of the first clamping hole and the central axis of the fourth clamping hole are perpendicular to the central axis of the first slideway, the diameters of the first latch and the second latch are equal, and the width of the first slideway is equal to the diameter of the first latch.

[0019] Preferably, it also includes a second slideway for guiding the second pin, the second slideway is opened on the inner wall of the connecting tube, the second slideway is opened along the length direction of the connecting tube, the central axis of the third clamping hole intersects the central axis of the second slideway vertically, and the width of the second slideway is equal to the diameter of the second pin.

[0020] Compared with the prior art, the beneficial technical effects of the present invention are:

[0021] The present invention provides a telescopic electroscope. By clamping the first elastic clamping assembly with the first clamping hole, the bottom tube and the connecting tube are reliably connected and convenient for quick connection, and the two will not separate from each other or the connecting tube will not retract. By clamping the second elastic clamping assembly with the second clamping hole, the connecting tube and the top tube are reliably connected and convenient for quick connection, and the two will not separate from each other or the top tube will not retract. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Figure 1 It is a cross-sectional structural schematic diagram of the present invention;

[0024] Figure 2 A schematic diagram of the structure of a working state of a self-locking mechanism;

[0025] Figure 3 It is a schematic diagram of the state structure when the connecting pipe is extended;

[0026] Figure 4 It is a schematic diagram of the structure when the top pipe is extended.

[0027] Description of reference numerals: 1. sound and light alarm; 2. metal contact; 3. jacking pipe;

[0028] 4. bottom tube; 401. first clamping hole; 402. fourth clamping hole; 403. first slideway;

[0029] 5. Connecting pipe; 501. Second clamping hole; 502. Third clamping hole; 503. Second slideway;

[0030] 6. Fixed plate; 7. Fixed rod; 8. Fixed cone; 9. Sliding cone; 901. Groove; 10. Second compression spring; 11. Limit plate; 12. First compression spring; 13. Sliding block; 1301. Driving surface; 14. Fixed cylinder; 15. First latch; 16. Third compression spring; 17. Second latch; 18. Fourth compression spring; 19. Rubber sleeve. DETAILED DESCRIPTION

[0031] The core of the present invention is to provide a telescopic electroscope, which can improve the connection efficiency on the basis of improving the connection reliability of large and small tubes.

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "middle", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In a specific embodiment of the present invention, Figures 1 to 4 As shown, it includes a sound and light alarm 1, a metal contact 2 is arranged at the top of the sound and light alarm 1, an insulating rod is fixed at the bottom of the sound and light alarm 1, and the insulating rod includes a top pipe 3, a bottom pipe 4, a connecting pipe 5 and a self-locking mechanism;

[0035] The outer wall of the connecting tube 5 is slidably matched with the central axis hole of the bottom tube 4, and the self-locking mechanism is arranged between the connecting tube 5 and the bottom tube 4, and the self-locking mechanism can allow or prevent the connecting tube 5 from sliding; a first elastic clamping assembly is installed at the bottom end of the connecting tube 5, and the first elastic clamping assembly is located above the self-locking mechanism, and a first clamping hole 401 for clamping with the first elastic clamping assembly is opened at the top end of the bottom tube 4;

[0036] The outer wall of the top pipe 3 is slidably matched with the central axis hole of the connecting pipe 5. A second elastic clamping assembly is installed at the bottom end of the top pipe 3. A second clamping hole 501 for clamping with the second elastic clamping assembly is opened at the top end of the connecting pipe 5. The top end of the top pipe 3 is fixedly connected to the bottom end of the sound and light alarm 1.

[0037] Specifically, by engaging the first elastic clamping assembly with the first clamping hole 401, the connection between the bottom tube 4 and the connecting tube 5 is reliable and convenient for quick connection, and the two will not be separated from each other or the connecting tube 5 will not retract; by engaging the second elastic clamping assembly with the second clamping hole 501, the connection between the connecting tube 5 and the top tube 3 is reliable and convenient for quick connection, and the two will not be separated from each other or the top tube 3 will not retract.

[0038] In a specific embodiment of the present invention, the self-locking mechanism includes a fixed plate 6, a fixed rod 7, a fixed cone 8, a sliding cone 9 and an elastic telescopic component. The fixed plate 6 is fixedly connected to the bottom end surface of the connecting tube 5. The fixed rod 7, the fixed cone 8 and the sliding cone 9 are all coaxially arranged with the bottom tube 4. The top of the fixed rod 7 is fixedly connected to the bottom surface of the fixed plate 6. The fixed cone 8 is fixed to the bottom end of the fixed rod 7. The fixed rod 7 slides through the sliding cone 9. The sliding cone 9 is located between the fixed cone 8 and the fixed plate 6. The large diameter end of the fixed cone 8 is arranged opposite to the large diameter end of the sliding cone 9. The diameter of the large diameter end of the fixed cone 8 is smaller than the diameter of the large diameter end of the sliding cone 9. The height of the fixed rod 7 is greater than the height of the sliding cone 9. The elastic telescopic component is fixedly connected to the bottom tube 4 and is located on one side of the fixed rod 7. The working end of the elastic telescopic component can abut against the end surface of the large diameter end of the fixed cone 8 and the sliding cone 9 can drive the working end of the elastic telescopic component to retract.

[0039] The elastic telescopic component includes a first compression spring 12, a slider 13 and a fixed cylinder 14. The fixed cylinder 14 is horizontally arranged and fixedly connected to the bottom tube 4. One end of the slider 13 is located in the fixed cylinder 14 and is slidingly connected to the inner wall of the fixed cylinder 14. A sealing plate is fixed to the end of the fixed cylinder 14 away from the slider 13. The first compression spring 12 is arranged between the sealing plate and the slider 13. A driving surface 1301 is provided at the end of the slider 13 close to the fixed rod 7. The driving surface 1301 is a downwardly inclined inclined surface, and the end of the inclined surface away from the fixed cylinder 14 is the lower end.

[0040] Specifically, the slider 13 is the working end of the elastic telescopic component; the fixed tube 14 can be threaded or bonded to the bottom tube 4; a slide groove is provided on the inner wall of the fixed tube 14 and the slide groove does not penetrate the end of the fixed tube 14 close to the fixed rod 7, and the end of the slider 13 located in the fixed tube 14 is provided with a protrusion structure that slides with the slide groove, and the protrusion structure slides with the guide of the slide groove, thereby guiding the slider 13 and preventing the slider 13 from escaping from the fixed tube 14. The inclination angle of the driving surface 1301 is greater than or equal to 45°, so that the sliding cone 9 can push the slider 13 through the driving surface 1301.

[0041] A groove 901 is provided on the end surface of the large diameter end of the sliding cone 9 , and the inner diameter of the groove 901 is greater than or equal to the diameter of the large diameter end of the fixed cone 8 .

[0042] The self-locking mechanism also includes a second compression spring 10. The bottom end of the bottom tube 4 is fixedly connected to a limit plate 11 for limiting the second compression spring 10. The second compression spring 10 is located between the limit plate 11 and the fixed cone 8. The top end of the second compression spring 10 is fixedly connected to the small diameter end of the fixed cone 8 or the bottom end of the second compression spring 10 is fixedly connected to the limit plate 11.

[0043] Specifically, when the connecting pipe 5 needs to be extended, the second compression spring 10 is used to provide an upward pushing force to the fixed frustum 8 .

[0044] In a specific embodiment of the present invention, the first elastic clamping assembly includes a first latch 15 and a third compression spring 16. The first latch 15 is horizontally arranged and slides through the wall of the connecting tube 5. The first latch 15 is symmetrically provided with two baffles, and baffles are fixed on the opposite surfaces of the two first latches 15. The two ends of the third compression spring 16 are respectively fixedly connected to the two baffles; the inner diameter of the first clamping hole 401 matches the outer diameter of the first latch 15, and the first clamping hole 401 penetrates the wall of the bottom tube 4; the length of the first latch 15 is greater than or equal to the sum of the wall thickness of the bottom tube 4 and the connecting tube 5.

[0045] Specifically, when the first latch 15 is aligned with the first latch hole 401, the two first latches 15 are inserted into the first latch hole 401 under the elastic force of the third compression spring 16; if the connecting tube 5 needs to be contracted, the two first latches 15 are pressed inward to separate their ends from the first latch hole 401, so that the connecting tube 5 can be contracted.

[0046] The second elastic clamping assembly includes a second latch 17 and a fourth compression spring 18. The second latch 17 is horizontally arranged and slides through the wall of the top pipe 3. Two second latches 17 are symmetrically arranged. Blocks are fixed on the opposite surfaces of the two second latches 17. The two ends of the fourth compression spring 18 are fixedly connected to the two blocks respectively; the inner diameter of the second clamping hole 501 matches the outer diameter of the second latch 17, and the second clamping hole 501 penetrates the wall of the top pipe 3.

[0047] Specifically, when the second latch 17 is aligned with the second clamping hole 501, the two second latches 17 are inserted into the second clamping hole 501 under the elastic force of the fourth compression spring 18; if the top tube 3 needs to be retracted, the two second latches 17 are pressed inward to separate their ends from the second clamping hole 501, so that the top tube 3 can be retracted.

[0048] In a specific embodiment of the present invention, it also includes a third clamping hole 502 and a fourth clamping hole 402. The third clamping hole 502 is opened on the tube wall of the bottom end of the connecting tube 5 and the third clamping hole 502 is located above the first elastic clamping component. The third clamping hole 502 passes through the tube wall of the connecting tube 5, and the second latch 17 is plugged into the third clamping hole 502; the fourth clamping hole 402 is opened on the tube wall of the top end of the bottom tube 4, and the fourth clamping hole 402 is located above the first clamping hole 401, and the fourth clamping hole 402 passes through the tube wall of the bottom tube 4; the length of the second latch 17 is greater than or equal to the sum of the wall thicknesses of the bottom tube 4, the connecting tube 5 and the top tube 3; the vertical distance between the first clamping hole 401 and the fourth clamping hole 402 is equal to the vertical distance between the third clamping hole 502 and the first latch 15.

[0049] Specifically, if Figure 1As shown, at this time, the second latch 17 is plugged into the third clamping hole 502, and the setting of the third clamping hole 502 prevents the top pipe 3 from arbitrarily expanding and contracting, ensuring that the top pipe 3 does not automatically slide when the insulating rod is in a contracted state; Figure 2 As shown, when the connecting tube 5 is in the extended state, the second latch 17 is plugged into the fourth clamping hole 402, and the fourth clamping hole 402 is set so that the top tube 3 will not be stretched or retracted at will, so that the insulating rod is a two-stage telescopic rod. If the top tube 3 needs to be extended, the two second latches 17 are pressed inwardly to separate their ends from the fourth clamping hole 402 and the third clamping hole 502 in turn, so that the top tube 3 can be extended accordingly. When the second latch 17 is aligned with the second clamping hole 501, the two second latches 17 are inserted into the second clamping hole 501 under the elastic force of the fourth compression spring 18.

[0050] In a specific embodiment of the present invention, it also includes a first slide 403 for guiding the first latch 15 and the second latch 17. The first slide 403 is opened on the inner wall of the bottom tube 4. The first slide 403 is opened along the length direction of the bottom tube 4. The central axis of the first clamping hole 401 and the central axis of the fourth clamping hole 402 are perpendicular to the central axis of the first slide 403. The diameters of the first latch 15 and the second latch 17 are equal, and the width of the first slide 403 is equal to the diameter of the first latch 15.

[0051] Specifically, when the connecting tube 5 is extended or retracted, the first slideway 403 is used to guide the first latch 15 and the second latch 17, thereby preventing the two from rotating about the central axis of the connecting tube 5, ensuring that the first latch 15 can be smoothly engaged with the first clamping hole 401, and ensuring that the second latch 17 can be smoothly engaged with the fourth clamping hole 402. Figure 1 , 3 As shown in FIG. 4 , one or two first slideways 403 may be provided.

[0052] In a specific embodiment of the present invention, it also includes a second slide 503 for guiding the second pin 17. The second slide 503 is opened on the inner wall of the connecting tube 5. The second slide 503 is opened along the length direction of the connecting tube 5. The central axis of the third clamping hole 502 intersects the central axis of the second slide 503 vertically, and the width of the second slide 503 is equal to the diameter of the second pin 17.

[0053] Specifically, when the top pipe 3 is extended or retracted, the second slideway 503 is used to guide the second latch pin 17, thereby preventing the second latch pin 17 from rotating about the central axis of the top pipe 3, and ensuring that the second latch pin 17 can be smoothly engaged with the second clamping hole 501. Figure 1 , 3 As shown in FIG. 4 , one or two second slideways 503 may be provided.

[0054] In a specific embodiment of the present invention, a rubber sleeve 19 is sleeved on the bottom end of the bottom tube 4 .

[0055] In addition, in order to facilitate pressing the first latch 15 and the second latch 17, the diameters of the first latch hole 401, the second latch hole 501, the third latch hole 502 and the fourth latch hole 402 are 5 mm to 10 mm. The staff can choose to press the first latch 15 and the second latch 17 with fingers or tools.

[0056] The working principle of the telescopic electroscope of the present invention is as follows: Figure 1 As shown, the insulating rod is in a fully retracted state, the bottom surface of the slider 13 is clamped with the top surface of the fixed cone 8, the driving surface 1301 is in contact with the edge of the sliding cone 9, the top of the sliding cone 9 is in contact with the fixed plate 6, and the second compression spring 10 is in a compressed state, so the connecting pipe 5 cannot be extended or retracted, and the top pipe 3 is pressed downward, and the top pipe 3 drives the second elastic clamping assembly to descend, and the second elastic clamping assembly drives the connecting pipe 5 to descend, and the second connecting pipe 5 drives the fixed plate 6 to descend, and the fixed plate 6 drives the sliding cone 9, the fixed rod 7 and the fixed cone 8 to descend, and the sliding cone 9 pushes the slider 13 to retract into the fixed cylinder 14 through the driving surface 1301. When the bottom surface of the slider 13 is higher than the bottom surface of the sliding cone 9, the sliding cone 9 slides downward accordingly, and the top of the fixed cone 8 enters the groove 901, that is, Figure 2 As shown, the top pipe 3 is released, and the second compression spring 10 lifts the fixed cone 8 upward, so that the fixed rod 7 and the sliding cone 9 rise synchronously. When the bottom surface of the slider 13 is lower than the bottom surface of the sliding cone 9, it is unlocked, and the connecting pipe 5 can be extended. Figure 2 As shown, when the connecting tube 5 needs to be retracted, the two first latches 15 are pressed inwardly to separate their ends from the first clamping holes 401, and the two second latches 17 are pressed inwardly to separate their ends from the fourth clamping holes 402 in turn. Then, the connecting tube 5 can be retracted by pressing the top tube 3 downwardly, and the self-locking mechanism is synchronously lowered. When the edge of the sliding cone 9 contacts the driving surface 1301, the sliding cone 9 stops moving downward. At this time, the fixed rod 7 and the fixed cone 8 continue to move downward. When the top surface of the fixed cone 8 is flush with the bottom surface of the slider 13, the slider 13 forms a Figure 1 Status shown.

[0057] By engaging the first latch 15 with the first clamping hole 401, the bottom tube 4 and the connecting tube 5 are reliably connected and convenient for quick connection, and the two will not separate from each other or the connecting tube 5 will not retract; by engaging the second latch 17 with the second clamping hole 501, the connecting tube 5 and the top tube 3 are reliably connected and convenient for quick connection, and the two will not separate from each other or the top tube 3 will not retract.

[0058] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other, and the embodiments can be combined with each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0059] The above embodiments are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A telescopic electroscope, comprising an audible and visual alarm (1), wherein a metal contact (2) is arranged at the top of the audible and visual alarm (1), and an insulating rod is fixed at the bottom of the audible and visual alarm (1), characterized in that: The insulating rod comprises a top tube (3), a bottom tube (4), a connecting tube (5) and a self-locking mechanism; The outer wall of the connecting tube (5) is slidably matched with the central axis hole of the bottom tube (4); the self-locking mechanism is arranged between the connecting tube (5) and the bottom tube (4), and the self-locking mechanism can allow or prevent the connecting tube (5) from sliding; a first elastic clamping assembly is installed at the bottom end of the connecting tube (5), the first elastic clamping assembly is located above the self-locking mechanism, and a first clamping hole (401) for clamping with the first elastic clamping assembly is opened at the top end of the bottom tube (4); The outer wall of the top tube (3) is slidably matched with the central axis hole of the connecting tube (5); a second elastic clamping assembly is installed at the bottom end of the top tube (3); a second clamping hole (501) for clamping with the second elastic clamping assembly is opened at the top end of the connecting tube (5); and the top end of the top tube (3) is fixedly connected to the bottom end of the sound and light alarm (1).

2. The telescopic electroscope according to claim 1, characterized in that: The self-locking mechanism comprises a fixed plate (6), a fixed rod (7), a fixed cone (8), a sliding cone (9) and an elastic telescopic component; the fixed plate (6) is fixedly connected to the bottom end surface of the connecting tube (5); the fixed rod (7), the fixed cone (8) and the sliding cone (9) are all coaxially arranged with the bottom tube (4); the top end of the fixed rod (7) is fixedly connected to the bottom surface of the fixed plate (6); the fixed cone (8) is fixed to the bottom end of the fixed rod (7); the fixed rod (7) slides through the sliding cone (9); the sliding cone (9) is located on the fixed cone (8) and the fixed plate (6), the large diameter end of the fixed cone (8) is arranged opposite to the large diameter end of the sliding cone (9), the diameter of the large diameter end of the fixed cone (8) is smaller than the diameter of the large diameter end of the sliding cone (9), and the height of the fixed rod (7) is greater than the height of the sliding cone (9); the elastic telescopic component is fixedly connected to the bottom tube (4) and is located on one side of the fixed rod (7), the working end of the elastic telescopic component can abut against the end surface of the large diameter end of the fixed cone (8) and the sliding cone (9) can drive the working end of the elastic telescopic component to retract.

3. The telescopic electroscope according to claim 2, characterized in that: The elastic telescopic component comprises a first compression spring (12), a slider (13) and a fixed tube (14); the fixed tube (14) is arranged horizontally, the fixed tube (14) is fixedly connected to the bottom tube (4); one end of the slider (13) is located in the fixed tube (14) and is connected to the inner wall of the fixed tube (14) in a guiding sliding manner; a blocking plate is fixed to the end of the fixed tube (14) away from the slider (13); the first compression spring (12) is arranged between the blocking plate and the slider (13); a driving surface (1301) is arranged at one end of the slider (13) close to the fixed rod (7); the driving surface (1301) is an inclined surface inclined downward, and the end of the inclined surface away from the fixed tube (14) is the lower end.

4. The telescopic electroscope according to claim 2, characterized in that: A groove (901) is provided on the end surface of the large diameter end of the sliding cone (9), and the inner diameter of the groove (901) is greater than or equal to the diameter of the large diameter end of the fixed cone (8).

5. The telescopic electroscope according to claim 2, characterized in that: The self-locking mechanism also includes a second compression spring (10), the bottom end of the bottom tube (4) is fixedly connected to a limiting plate (11) for limiting the second compression spring (10), the second compression spring (10) is located between the limiting plate (11) and the fixed cone (8), the top end of the second compression spring (10) is fixedly connected to the small diameter end of the fixed cone (8) or the bottom end of the second compression spring (10) is fixedly connected to the limiting plate (11).

6. The telescopic electroscope according to claim 1, characterized in that: The first elastic clamping assembly comprises a first latch (15) and a third compression spring (16); the first latch (15) is horizontally arranged and slides through the tube wall of the connecting tube (5); the first latch (15) is symmetrically provided with two, and baffles are fixed on the opposite surfaces of the two first latches (15); the two ends of the third compression spring (16) are respectively fixedly connected to the two baffles; the inner diameter of the first clamping hole (401) matches the outer diameter of the first latch (15), and the first clamping hole (401) penetrates the tube wall of the bottom tube (4); the length of the first latch (15) is greater than or equal to the sum of the wall thicknesses of the bottom tube (4) and the connecting tube (5).

7. The telescopic electroscope according to claim 6, characterized in that: The second elastic clamping assembly comprises a second latch (17) and a fourth compression spring (18); the second latch (17) is horizontally arranged and slides through the tube wall of the top tube (3); two second latches (17) are symmetrically arranged, and blocks are fixed on the opposite surfaces of the two second latches (17); the two ends of the fourth compression spring (18) are respectively fixedly connected to the two blocks; the inner diameter of the second clamping hole (501) matches the outer diameter of the second latch (17), and the second clamping hole (501) penetrates the tube wall of the top tube (3).

8. The telescopic electroscope according to claim 7, characterized in that: The invention also comprises a third clamping hole (502) and a fourth clamping hole (402), wherein the third clamping hole (502) is provided on the tube wall at the bottom end of the connecting tube (5) and the third clamping hole (502) is located above the first elastic clamping component, the third clamping hole (502) penetrates the tube wall of the connecting tube (5), and the second latch (17) is plugged into the third clamping hole (502); the fourth clamping hole (402) is provided on the tube wall at the top end of the bottom tube (4), the fourth clamping hole (402) is located above the first clamping hole (401), and the fourth clamping hole (402) penetrates the tube wall of the bottom tube (4); the length of the second latch (17) is greater than or equal to the sum of the wall thicknesses of the bottom tube (4), the connecting tube (5) and the top tube (3); the vertical distance between the first clamping hole (401) and the fourth clamping hole (402) is equal to the vertical distance between the third clamping hole (502) and the first latch (15).

9. The telescopic electroscope according to claim 8, characterized in that: It also includes a first slideway (403) for guiding the first latch pin (15) and the second latch pin (17), the first slideway (403) being opened on the inner wall of the bottom tube (4), the first slideway (403) being opened along the length direction of the bottom tube (4), the center axis of the first clamping hole (401) and the center axis of the fourth clamping hole (402) both intersecting perpendicularly with the center axis of the first slideway (403), the diameters of the first latch pin (15) and the second latch pin (17) being equal, and the width of the first slideway (403) being equal to the diameter of the first latch pin (15).

10. The telescopic electroscope according to claim 8, characterized in that: It also includes a second slideway (503) for guiding the second latch (17), the second slideway (503) being provided on the inner wall of the connecting tube (5), the second slideway (503) being provided along the length direction of the connecting tube (5), the central axis of the third clamping hole (502) being perpendicularly intersected with the central axis of the second slideway (503), and the width of the second slideway (503) being equal to the diameter of the second latch (17).

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