CN107389985B

CN107389985B - Test terminal with function of preventing short circuit and false disconnection

Info

Publication number: CN107389985B
Application number: CN201710437173.3A
Authority: CN
Inventors: 倪苗升; 孙玉彤; 陈晓彬; 李海涛; 陈庆鸿; 蔡昭宇; 孙旭
Original assignee: ZHUHAI ELECTRIC POWER DESIGN INSTITUTE CO LTD; Guangdong Power Grid Co Ltd; Jieyang Power Supply Bureau of Guangdong Power Grid Co Ltd
Current assignee: ZHUHAI ELECTRIC POWER DESIGN INSTITUTE CO LTD; Guangdong Power Grid Co Ltd; Jieyang Power Supply Bureau of Guangdong Power Grid Co Ltd
Priority date: 2017-06-12
Filing date: 2017-06-12
Publication date: 2023-03-24
Anticipated expiration: 2037-06-12
Also published as: CN107389985A

Abstract

The invention belongs to the technical field of terminal devices, and relates to a test terminal with a function of preventing short circuit and false disconnection. The connecting device comprises a first wiring device, a second wiring device, a connecting block and an insulating shell, wherein the first wiring device is connected with the second wiring device through the connecting block, the first wiring device comprises a first wiring jack, a convex round shaft is arranged at the bottom of the first wiring jack, a spring is connected to the bottom of the convex round shaft, a side-opened sleeve is sleeved on the first wiring jack, a pressing component with a convex structure is arranged on the sleeve, a U-shaped pressing cylinder connected with the convex round shaft is further arranged in the sleeve, and the pressing component is connected through a limiting device; the connecting block comprises an upper connecting piece and a lower connecting piece, and the lower connecting piece is provided with a U-shaped fork; two ends of the upper connecting piece are provided with inverted L-shaped insulating baffles. The test terminal with the function of preventing the short circuit from being disconnected by mistake is simple in structure and convenient to operate, and safety accidents caused by misoperation are effectively prevented.

Description

Test terminal with function of preventing short circuit and false disconnection

Technical Field

The invention belongs to the technical field of terminal devices, and particularly relates to a test terminal with a function of preventing short circuit and false disconnection.

Background

The switching and connection of the secondary loop cable lines are usually realized by connecting terminals in the interior of a power system relay protection screen, a terminal box or a control collection box and other screens. Part of the terminals are provided with terminal connecting sheets and test wire jacks according to the test requirements, the connecting sheets are used for connecting metal parts at two ends of the terminals, screws are attached above the connecting sheets, the screws are unscrewed, and the connecting sheets can be manually shifted to realize two states of connection and disconnection at two ends of the terminals; the connecting sheet is locked and fixed in the current state by screwing the screw, and the effect of reliable connection or disconnection is achieved. The connecting piece can be pulled to conveniently and reliably realize the connection and disconnection of the cables connected with the two ends of the terminal; the test wire jacks are directly connected to the terminal metal sheets, the inner diameters of the test wire jacks are slightly larger than the outer diameter of the test wire plug, and the test wire jacks are arranged on the left side and the right side respectively and used for temporarily, conveniently and reliably inserting and pulling out the test wires during testing.

However, the test terminal in the prior art has a high requirement on professional ability of an operator, and when the test terminal is used, the test terminal must be operated completely according to a specified operation sequence, the steps cannot be reversed, and even misoperation cannot occur; conventional test terminal lacks the mistake function of preventing, can't realize the shutting function of flow operation, relies on staff's subjective control completely, and the error probability is high, and in case the error consequence is serious.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, provides the test terminal with the function of preventing the short circuit and the false disconnection, has a simple structure, is convenient to operate, and can effectively prevent safety accidents caused by the false operation.

In order to solve the problems, the technical scheme provided by the invention is as follows: a test terminal with a function of preventing short circuit from being disconnected by mistake comprises a first wiring device, a second wiring device, a connecting block and an insulating shell, wherein the first wiring device is connected with the second wiring device through the connecting block, and the first wiring device, the second wiring device and the connecting block are arranged in the insulating shell; the connecting block comprises an upper connecting piece and a lower connecting piece, and a U-shaped fork is arranged on one side of the lower connecting piece, which is close to the first connecting device; the upper connecting piece is provided with an inverted L-shaped first insulating baffle close to the first wire plugging device end, and the upper connecting piece is provided with an inverted L-shaped second insulating baffle close to the second wire plugging device end.

The large-radius cylinder below the convex round shaft and the small-radius cylinder above the convex round shaft are respectively used for locking and unlocking the left movement of the U-shaped fork of the lower connecting piece of the connecting element; the sleeve is provided with a side opening, so that a special limiting device can be conveniently inserted, and when the sleeve works normally, the upper section of the side opening and the upper plane of the U-shaped pressing cylinder only have a narrow gap for the insertion of the special limiting device; when the test terminal is in a connection state, the second insulating baffle is positioned right above the second sleeve, and when the second insulating baffle is positioned above the second sleeve, the test wire cannot be inserted, when the connecting block moves to the left, namely, the test terminal is in a disconnection state, the first insulating baffle is positioned right above the first sleeve, when the first insulating baffle is positioned above the first sleeve, the pressing component cannot be loosened, the first insulating baffle and the upper connecting piece are connected into a whole and are in hard connection, the first insulating baffle is used for closing and opening the first wire insertion hole, and meanwhile, the extraction limitation and the closing of the inserted short-circuit plug-in are realized; the second insulating baffle is connected with the upper connecting piece into a whole and adopts hard connection for closing and opening the second wire inserting hole and simultaneously realizing locking of right movement of the inserted experimental plug to the connecting block.

Furthermore, the pressing part is of an inverted U-shaped cylinder structure, and the protruding structure is located in the middle of the inverted U-shaped cylinder structure.

Furthermore, the sleeve is in threaded connection with the pressing component, an external thread structure is arranged on the sleeve, and an internal thread structure is arranged on the pressing component. The external thread on the sleeve is matched with the internal thread of the pressing component, so that other nuts can be prevented from being screwed in.

Furthermore, the diameter value of the convex structure of the pressing part is smaller than the inner diameter value of the U-shaped pressing cylinder, and the length value of the convex structure of the pressing part is smaller than the height value of the U-shaped pressing cylinder. When the limiting device is not inserted, the pressing component is pressed downwards through screwing the threads, the protruding structures of the pressing component are inserted into the U-shaped pressing cylinder, but the protruding structures cannot be in contact with the U-shaped pressing cylinder, and therefore the U-shaped pressing cylinder cannot press the convex circular shaft downwards.

Furthermore, the limiting device comprises an insulating frame and a limiting conductive plug, and one end of the limiting conductive plug is connected with the insulating frame. Spacing conductive plug is sheet structure, and the front end has elasticity, with telescopic side opening cooperation, when spacing conductive plug inserts telescopic side opening, spacing conductive plug adopts the elastic contact cooperation with the sleeve inner wall, realizes preliminary fixed short circuit, can reciprocate under the atress condition.

Furthermore, the limiting device is detachably connected with the U-shaped pressing cylinder and the pressing component. Only when the limiting device is inserted and the pressing component is screwed down, the convex round shaft can be pressed downwards, the lower connecting piece can be moved leftwards to be disconnected, and the limiting device is taken down when the disconnection function is not needed.

Furthermore, a cylinder is sleeved outside the spring. The spring with the sleeve is arranged at the bottom of the convex round shaft and used for recovering the spring from compression deformation to an extended normal state and supporting the upper convex round shaft out of the spring cylinder when a limit bolt of the short-circuit plug-in is screwed out upwards to a non-compression state, so that the limitation that the U-shaped fork of the lower conductive connecting piece can be stirred to move left, namely locking, is realized; when the limiting device is inserted and the pressing component is screwed down, the spring is compressed and deformed to the lower part of the spring cylinder from the normal state of extension, and the large-radius cylinder part of the upper convex round shaft enters the spring cylinder, so that the unlocking can be released when the conducting lower connecting piece U-shaped fork can be pulled to move left.

Furthermore, the first wiring device also comprises a first wire pressing conductor, a first wire pressing screw and a first wire pressing nut, the second wiring device comprises a second wiring jack, a second wire pressing conductor, a second wire pressing screw and a second wire pressing nut, the first wire pressing nut is arranged on the first wire pressing conductor in the direction away from the connecting block, the first wire pressing screw is matched with the first wire pressing nut, and the first wiring jack is arranged on the first wire pressing conductor; the second wire pressing nut is arranged on the second wire pressing conductor in the direction away from the connecting block, the second wire pressing screw is matched with the second wire pressing nut, the second wiring jack is arranged on the second wire pressing conductor, and the second wire inserting hole is provided with a second sleeve.

Furthermore, one end of the first line pressing conductor is pressed between the upper connecting piece and the lower connecting piece, and one end of the second line pressing conductor is pressed between the upper connecting piece and the lower connecting piece.

Furthermore, the connecting block further comprises a compression screw, compression nuts are arranged on the upper connecting piece and the lower connecting piece, and the compression screw penetrates through the compression nuts and is matched with the compression nuts.

Compared with the prior art, the beneficial effects are: the test terminal with the function of preventing the test terminal from being disconnected by mistake due to no short circuit is simple in structure and convenient to operate, the disconnection and connection functions of the connecting blocks are realized by arranging the special limiting device, meanwhile, the baffle is arranged, the test terminal is prevented from being disconnected by mistake under the condition of no short circuit, an operator can only operate according to a specified operation sequence, otherwise, the next operation cannot be carried out, and safety accidents caused by mistake operation are effectively prevented.

Drawings

Fig. 1 is a front view of the present invention.

FIG. 2 is a top view of the present invention.

Fig. 3 is a schematic view of the overall structure of the present invention.

Fig. 4 is a front view of the sleeve of the present invention.

Fig. 5 is a side view of the sleeve of the present invention.

FIG. 6 is a sectional view taken along the direction of FIG. 5 KK.

Fig. 7 is a cross-sectional view taken in the direction of fig. 5LL in accordance with the present invention.

FIG. 8 is a schematic view of the structure of the pressing member of the present invention.

FIG. 9 is a schematic view of a U-shaped compacting cylinder according to the present invention.

Fig. 10 is a cross-sectional view taken in the direction of fig. 9MM in accordance with the present invention.

FIG. 11 is a schematic view of the upper and lower connecting sheets of the present invention.

Fig. 12 is a schematic top view of the spacing device of the present invention.

Fig. 13 is a schematic side view of the spacing device of the present invention.

FIG. 14 is a first state diagram of the present invention.

FIG. 15 is a diagram illustrating a second state of the present invention.

FIG. 16 is a third state diagram of the present invention.

FIG. 17 is a fourth state diagram of the present invention.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

As shown in the figure, the test terminal with the function of preventing short circuit and false disconnection comprises a first wiring device 1, a second wiring device 2, a connecting block 3 and an insulating shell 4, wherein the first wiring device 1 is connected with the second wiring device 2 through the connecting block 3, the first wiring device 1, the second wiring device 2 and the connecting block 3 are arranged in the insulating shell 4, the first wiring device 1 comprises a first wiring jack, a convex round shaft 8 is arranged at the bottom of the first wiring jack, a spring 9 is connected to the bottom of the convex round shaft 8, a sleeve 11 with a side opening 22 is sleeved on the first wiring jack, a pressing component 12 with a convex structure 24 is arranged on the sleeve 11, a U-shaped pressing cylinder 10 connected with the convex round shaft 8 is further arranged in the sleeve 11, and the pressing component 12 is connected with the convex round shaft 8 through a limiting device; the connecting block 3 comprises an upper connecting piece 14 and a lower connecting piece 15, and one side of the lower connecting piece 15, which is close to the first connecting device, is provided with a U-shaped fork 26; the upper connecting piece 14 is provided with an inverted L-shaped first insulating baffle 13 near the first wire plugging device end, and the upper connecting piece 14 is provided with an inverted L-shaped second insulating baffle 17 near the second wire plugging device end.

The cylinder with large radius below the convex round shaft 8 and the cylinder with small radius above the convex round shaft are respectively used for locking and unlocking the U-shaped fork 26 of the lower connecting piece 15 of the connecting element to move left; the sleeve 11 is provided with a side opening 22, so that a special limiting device can be conveniently inserted, and when the sleeve works normally, only a narrow gap is formed between the upper section of the side opening 22 and the upper plane of the U-shaped pressing cylinder 10, and only the special limiting device can be inserted; when the test terminal is in a connected state, the second insulating baffle 17 is positioned right above the second sleeve 1811, when the second insulating baffle 17 is positioned above the second sleeve 1811, the test wire 30 cannot be inserted, when the connecting block 3 moves to the left, namely, the test terminal is in a disconnected state, the first insulating baffle 13 is positioned right above the first sleeve 11, when the first insulating baffle 13 is positioned above the first sleeve 11, the pressing component 12 cannot be loosened, the first insulating baffle 13 and the upper connecting piece 14 are connected into a whole and are in hard connection, the first insulating baffle 13 is used for closing and opening the first wire insertion hole, and meanwhile, the extraction limitation and closing of the inserted short circuit plug-in are realized; the second insulating baffle 17 and the upper connecting piece 14 are connected into a whole and are in hard connection, so that the second wire inserting hole is closed and opened, and the right movement of the inserted experimental plug to the connecting block 3 is locked.

Specifically, the pressing member 12 is an inverted "U" shaped cylindrical structure, and the protrusion 24 is located in the middle of the inverted "U" shaped cylindrical structure.

The sleeve 11 and the pressing component 12 are connected through threads, the sleeve 11 is provided with an external thread structure 23, and the pressing component 12 is provided with an internal thread structure 25. The external thread on the sleeve 11 is matched with the internal thread of the pressing component 12, so that other nuts can be prevented from being screwed in.

In addition, the diameter of the protruding structure 24 of the pressing member 12 is smaller than the inner diameter of the "U" shaped pressing cylinder 10, and the length of the protruding structure 24 of the pressing member 12 is smaller than the height of the "U" shaped pressing cylinder 10. When the limiting device is not inserted, the pressing member 12 is pressed downward by screwing the screw, the protrusion structure 24 of the pressing member 12 is inserted into the "U" -shaped pressing cylinder 10, but the protrusion structure 24 cannot be contacted with the "U" -shaped pressing cylinder 10, and therefore the "U" -shaped pressing cylinder 10 cannot press the "convex" circular shaft 8 downward.

The limiting device comprises an insulating frame 28 and a limiting conductive plug 29, wherein one end of the limiting conductive plug 29 is connected with the insulating frame 28. Spacing conductive plug 29 is the sheet structure, and the front end has elasticity, cooperates with the side opening 22 of sleeve 11, and when spacing conductive plug 29 inserted the side opening 22 of sleeve 11, spacing conductive plug 29 adopted the elastic contact cooperation with the sleeve 11 inner wall, realized tentatively fixed short circuit, can reciprocate under the atress condition.

In addition, the limiting device is detachably connected with the U-shaped compaction cylinder 10 and the pressing component 12. Only when the limiting device is inserted, the pressing part 12 is screwed down to press the convex round shaft 8 downwards, the lower connecting piece 15 can move left to disconnect, and the limiting device is taken down when the disconnection function is not needed.

Wherein, the spring 9 is sleeved with a cylinder. The spring 9 with the sleeve 11 is arranged at the bottom of the convex round shaft 8 and used for recovering the spring 9 from compression deformation to an extended normal state and supporting the upper convex round shaft 8 out of a spring 9 cylinder when a limit bolt of the short-circuit plug-in is screwed out upwards to a non-pressing state, so that the limitation that the U-shaped fork 26 of the lower conductive connecting piece 15 can be shifted to move left, namely locking, is realized; when the limiting device is inserted and the pressing part 12 is screwed down, the spring 9 is compressed and deformed to the lower part of the spring 9 cylinder from the normal state of extension, and the large-radius cylinder part of the upper convex round shaft 8 enters the spring 9 cylinder, so that the U-shaped fork 26 capable of pulling the conductive lower connecting piece 15 is opened and locked.

In addition, the first wiring device 1 further comprises a first wire pressing conductor 7, a first wire pressing screw 5 and a first wire pressing nut 6, the second wiring device 2 comprises a second wiring jack, a second wire pressing conductor 21, a second wire pressing screw 19 and a second wire pressing nut 20, the first wire pressing nut 6 is arranged on the first wire pressing conductor 7 in the direction away from the connecting block 3, the first wire pressing screw 5 is matched with the first wire pressing nut 6, and the first wiring jack is arranged on the first wire pressing conductor 7; the second wire pressing nut 20 is arranged on the second wire pressing conductor 21 in the direction far away from the connecting block 3, the second wire pressing screw 19 is matched with the second wire pressing nut 20, the second wiring jack is arranged on the second wire pressing conductor 21, and a second sleeve 1811 is arranged on the second wire pressing hole.

One end of the first line pressing conductor 7 is pressed between the upper connecting piece 14 and the lower connecting piece 15, and one end of the second line pressing conductor 21 is pressed between the upper connecting piece 14 and the lower connecting piece 15.

In addition, the connecting block 3 further comprises a compression screw 16, the upper connecting piece 14 and the lower connecting piece 15 are provided with compression nuts 27, and the compression screw 16 penetrates through the compression nuts 27 and is matched with the compression nuts 27.

The operation process and the locking principle are as follows:

1. when the test terminal is in a normal connection state, the second insulating baffle 17 on the upper connecting piece 14 seals the second wire inserting hole, the test wire 30 cannot be inserted, the test wire 30 can be prevented from being directly inserted into the test wire 30 without pulling the connecting piece, the short-circuit wire is prevented from being inserted into the protection side by mistake, and then the middle connecting piece of the test terminal is pulled open.

2. First plug wire hole is in open state when testing terminal normal connection state, and stop device can insert at any time, pushes down part 12 and also can screw up at any time.

3. Set up the jack of first plug wire hole also being current transformer end into screwing up the bolt structure, traditional test wire 30 can not insert, can prevent the mistake and insert current transformer end with test wire 30, later dials connecting block 3.

4. When no limit device is inserted, the pressing part 12 is screwed down, the convex structure 24 of the pressing part 12 is inserted into the hollow position of the U-shaped pressing cylinder 10 and does not press the convex round shaft 8, so that the middle connecting sheet cannot be opened and shifted to a disconnected state, and the middle connecting sheet 3 of the test terminal can be prevented from being shifted directly without short circuit.

5. When the wire inserting hole is started, the limiting device is inserted into the side opening 22 of the first wire inserting hole sleeve 11, and then the bolt is screwed downwards. Because of the insertion of the special limiting device, the pressing component 12 presses the limiting device, the limiting device presses the U-shaped pressing cylinder 10, the U-shaped pressing cylinder 10 presses the convex circular shaft 8 downwards, the spring 9 deforms from the stretching normal state to the compression state, the upper pressure is generated, and the short circuit part is ensured to be in good contact. When the special limiting device is inserted, the insulating frame 28 of the limiting device partially blocks the first wire pressing screw 5, and a worker cannot unscrew the first wire pressing screw 5 to cause an open circuit at the end of the current transformer; the 'convex' round shaft 8 moves downwards, the small radius part of the upper part exposes out of a terminal metal wire pressing conductor, the left U-shaped fork 26 on the left side of the lower connecting piece 15 of the middle connecting block 3 is allowed to move leftwards, meanwhile, the pressing bolt moves downwards, the first insulating baffle 13 is allowed to move leftwards, and the middle connecting block 3 is opened to move leftwards to a 'disconnected' position state only in the state. The test terminal middle connecting sheet can be prevented from being directly pulled without short circuit.

6. Loosening the fastening screw of the middle connecting block 3 and moving the connecting block 3 to the left, screwing the compression screw 16 after the middle connecting block 3 is in place, disconnecting the test terminal, and isolating the current transformer side from the test side; the first insulating baffle 13 seals the upper space of the first sleeve 11, and when the connecting element is not recovered to the connection position state, the pressing part 12 cannot be unscrewed, so that the limiting device cannot be taken out, the short-circuit wire can be prevented from being directly pulled out without recovering the connecting sheet, the second insulating baffle 17 moves leftwards to open the second wire inserting hole, the plug of the test wire 30 is allowed to be inserted at any time, and the test wire 30 can be prevented from being directly inserted without pulling out the connecting sheet.

7. Test wires 30 are inserted into the second wire insertion holes, and a test routine is started. The inserted test wire 30 plug blocks the second insulating baffle 17 from moving to the right, so that the connecting block 3 cannot move to the right, and the connecting block 3 can be prevented from being directly restored without pulling out the test wire 30.

8. When the safety measure is recovered after the debugging is finished, the anti-misoperation principle of the mechanical locking of the structure is as follows: a, only when the plug of the test wire 30 is pulled out, the middle connecting element can be moved to the right to be in a connecting position state, so that the connecting sheet can be prevented from being directly restored without pulling out the test wire 30; b and only if the intermediate connection element returns to the "connected" position, the push-down member 12 can be operated, so that the removal stop device returns to the pre-operative position.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A test terminal with a function of preventing short circuit and false disconnection comprises a first wiring device (1), a second wiring device (2), a connecting block (3) and an insulating shell (4), wherein the first wiring device (1) is connected with the second wiring device (2) through the connecting block (3), the first wiring device (1), the second wiring device (2) and the connecting block (3) are arranged in the insulating shell (4), the test terminal is characterized in that the first wiring device (1) comprises a first wiring jack, a convex circular shaft (8) is arranged at the bottom of the first wiring jack, a spring (9) is connected to the bottom of the convex circular shaft (8), a sleeve (11) with a side opening (22) is sleeved on the first wiring jack, a pressing component (12) with a convex structure (24) is arranged on the sleeve (11), a U-shaped pressing cylinder (10) connected with the convex circular shaft (8) is further arranged in the sleeve (11), and the pressing component (12) is connected with the convex circular shaft (8) through a limiting device; the connecting block (3) comprises an upper connecting piece (14) and a lower connecting piece (15), and a U-shaped fork (26) is arranged on one side, close to the first wiring device (1), of the lower connecting piece (15); an inverted L-shaped first insulating baffle (13) is arranged at the end, close to the first wiring device (1), of the upper connecting sheet (14), and an inverted L-shaped second insulating baffle (17) is arranged at the end, close to the second wiring device (2), of the upper connecting sheet (14); the pressing component (12) is of an inverted U-shaped structure, and the bulge structure (24) is positioned in the middle of the inverted U-shaped structure; the limiting device comprises an insulating frame (28) and a limiting conductive plug (29), wherein one end of the limiting conductive plug (29) is connected with the insulating frame (28); the first wiring device (1) further comprises a first wire pressing conductor (7), a first wire pressing screw (5) and a first wire pressing nut (6), the second wiring device (2) comprises a second wiring jack, a second wire pressing conductor (21), a second wire pressing screw (19) and a second wire pressing nut (20), the first wire pressing nut (6) is arranged on the first wire pressing conductor (7) in the direction away from the connecting block (3), the first wire pressing screw (5) is matched with the first wire pressing nut (6), and the first wiring jack is arranged on the first wire pressing conductor (7); the second wire pressing nut (20) is arranged on the second wire pressing conductor (21) in the direction far away from the connecting block (3), the second wire pressing screw (19) is matched with the second wire pressing nut (20), the second wiring jack is arranged on the second wire pressing conductor (21), and a second sleeve (18) is arranged on the second wiring jack; one end of the first wire pressing conductor (7) is pressed between the upper connecting piece (14) and the lower connecting piece (15), and one end of the second wire pressing conductor (21) is pressed between the upper connecting piece (14) and the lower connecting piece (15).

2. The test terminal with the function of preventing short circuit from being disconnected by mistake as claimed in claim 1, wherein the sleeve (11) is in threaded connection with the pressing component (12), the sleeve (11) is provided with an external thread structure (23), and the pressing component (12) is provided with an internal thread structure (25).

3. The test terminal with the function of preventing short circuit from being disconnected by mistake as claimed in claim 1, characterized in that the diameter value of the convex structures (24) of the hold-down part (12) is smaller than the inner diameter value of the U-shaped pressing cylinder (10), and the length value of the convex structures (24) of the hold-down part (12) is smaller than the height value of the U-shaped pressing cylinder (10).

4. The test terminal with the function of preventing short circuit from being disconnected by mistake as claimed in claim 1, wherein the limiting device is detachably connected with the U-shaped pressing cylinder (10) and the pressing component (12).

5. Test terminal with short circuit and false open prevention function according to claim 1, characterized in that the spring (9) is externally sleeved with a cylinder.

6. The test terminal with the function of preventing short circuit from being disconnected by mistake as claimed in claim 1, wherein the connecting block (3) further comprises a compression screw (16), the upper connecting piece (14) and the lower connecting piece (15) are provided with compression nuts (27), and the compression screw (16) is arranged on the compression nuts (27) in a penetrating manner and matched with the compression nuts (27).