Electric propulsion interlocking mechanism

Abstract

An electric propulsion interlocking mechanism comprises a shell, a worm is rotationally connected to the shell, a rotating shaft is arranged on the worm, a first gear is arranged on the rotating shaft, a first rotating shaft is arranged on the shell, a second gear is arranged on the first rotating shaft, a third gear is arranged on the first rotating shaft, and a first chain gear is arranged on the first rotating shaft. A mounting seat is arranged on the first chain gear, a driving motor is arranged on the mounting seat, a second chain gear is arranged on the driving motor, and a chain is arranged between the first chain gear and the second chain gear; a second rotating shaft is arranged on the shell, a fourth gear is arranged on the second rotating shaft, a rotating disc is arranged on the second rotating shaft, marks are arranged on the rotating disc, and an opening is formed in the shell. The drawer of the switch cabinet can be conveniently opened and closed in a mode that the worm is matched with the helical rack, and due to the fact that the worm and the helical rack have a reverse self-locking function, the drawer is compact in structure, high in reliability, more efficient, more labor-saving, safer and worthy of popularization and application due to electric driving.

Description

TECHNICAL FIELD

[0001] The utility model relates to a mechanism, especially an electric propulsion interlocking mechanism. BACKGROUND

[0002] Low-voltage draw-out type switchgear is very common in application at home and abroad, especially in China, such as brand products ABB, MNS, Siemens 8PT, Schneider B cabinet, which have a wide application in China, and the application amount of GCK and GCS designed in China is larger, and the interlocking mechanism technology of switch cabinet drawer function unit in the industry is various, the technology cited by ABB, MNS 2.0 and MNS 3.0 is a propulsion switch cabinet drawer interlocking mechanism, that is, a large interlock and a small interlock, mechanical two positions and electrical three positions, and traditionally, a hand push form is adopted, which needs manual operation to shake the opening and closing switch cabinet drawer beside the switch cabinet, which has a certain risk (high-voltage electric spark and high-voltage electric arc may be generated), and moreover, the hand shaking method is time-consuming and laborious and has slow response speed.

[0003] Chinese utility model patent CN 201549812 U discloses a low-voltage draw-out type switch cabinet drawer propulsion interlocking mechanism, which has a complex structure, high production cost and poor reliability. CONTENT OF THE UTILITY MODEL

[0004] The utility model solves the above-mentioned defects of the prior art, and provides an electric propulsion interlocking mechanism capable of responding to the opening and closing operation of the switch cabinet drawer at a high speed, which meets the requirement that the opening and closing of the switch cabinet drawer can be conveniently realized by electric control, guarantees load power cut-off, and also enables the switch cabinet drawer to be manually opened and closed and effectively prevents misoperation through the connection, test and separation three-position display on the rotating disc.

[0005] The utility model discloses a technical scheme that solves its technical problems: this electric propulsion interlocking mechanism, including the casing, the casing is rotatably connected with the worm, the outer end surface on the worm is fixed with the coaxial setting pivot of worm, the pivot is fixed with the first gear, is provided with the first rotation axis on the casing, and the first rotation axis is fixed with the second gear that meshes with the first gear, and the first rotation axis is fixed with the third gear that is opposite to the second gear, and the first rotation axis is fixed with the first chain gear, and the side end of first chain gear is equipped with the mounting seat, and the mounting seat is fixed with the drive motor, and the pivot of drive motor is fixed with the second chain gear, and the chain is installed between first chain gear and second chain gear, be provided with the second rotation axis on the casing, and the second rotation axis is fixed with the fourth gear that meshes with the third gear, and the outside of second rotation axis is fixed with the turntable, and the outer end surface on the turntable has the mark of separation, test, connection, and the casing is opened and has the opening hole for observing single mark. Here the function of worm is, cooperate with the inclined slot on the lock seat, thereby drive the switch cabinet drawer on the cabinet body to move, here first rotation axis, second gear, third gear, first chain gear, mounting seat, drive motor, second chain gear, chain can drive the worm rotation through the form of electric drive, thereby drive switch cabinet drawer to move, and then compared with the traditional manual opening switch cabinet drawer mode will be more safe, here the function of second rotation axis, fourth gear, turntable, mark is, drive the turntable rotation, thereby drive the mark on the turntable to rotate while driving the worm rotation and synchronously driving the lock seat, thereby facilitate observation, control switch cabinet drawer movement.

[0006] Further improvement, the tooth surface of fourth gear is fixed with the limit block. Here the function of limit block is, avoid the condition that drive motor drives worm to rotate too much, because the limit block is set on the fourth gear, so when third gear drives fourth gear to rotate to a certain angle, it will not continue to rotate, avoid worm to rotate too much and separate from the lock seat, or make switch cabinet drawer move too much.

[0007] Further improvement, the outer profile surface of the second rotating shaft is provided with three V-shaped clamping grooves arranged step by step along the center of the second rotating shaft, a V-shaped spring is mounted on the shell, and the front end of the V-shaped spring is clamped in any one of the V-shaped clamping grooves; the positions of the three names of separation, test and connection on the mark correspond to the positions of the three V-shaped clamping grooves, respectively. The functions of the V-shaped clamping grooves and the V-shaped spring are as follows: since the positions of the three V-shaped clamping grooves match the positions of the three names of separation, test and connection on the mark on the rotating disc, when the rotating shaft is rotated by using a hexagonal wrench and the rotating disc is rotated, and the three arbitrary names on the mark on the rotating disc are rotated to the reminding position state, the V-shaped spring is clamped in the V-shaped clamping groove at this time, thereby giving a twisting reminder, indicating that the rotating disc is rotated to any one of the positions of separation, test and connection, and over-rotation is avoided; when it is necessary to continue to twist, the rotating shaft is twisted to rotate the rotating disc, the V-shaped clamping groove exerts a force to push the V-shaped spring out of the V-shaped clamping groove, so that the V-shaped clamping groove and the V-shaped spring are clamped at the next position, thereby further playing a reminding role and further avoiding misoperation.

[0008] Further improvement, the shell is provided with a pair of oppositely arranged insertion holes, top rods are inserted into the two insertion holes, the shell is provided with a pair of elastic sheets, one end of each of the two elastic sheets is fixed to the shell, the other end of each of the two elastic sheets is fixed to the corresponding top rod, the inner end of the second rotating shaft is provided with a recess, a V-shaped protruding table is fixed in the recess, a pair of micro switches are fixed to the shell, and the contacts of the two micro switches are oppositely arranged relative to the positions of the two top rods. The functions of the insertion holes, the top rods, the elastic sheets, the recess, the V-shaped protruding table, the micro switches and the contacts are as follows: the micro switches can give an electrical signal to the switch cabinet, when the separation name on the mark on the rotating disc is located at the reminding position, at this time, the V-shaped protruding table presses the contact of the micro switch on one side, thereby giving a signal to the switch cabinet to cut off the power supply, so that the plug and the socket are disconnected under the condition that they are not completely separated (the purpose is to avoid the generation of an electric spark when the plug and the socket are separated), so that the drawer of the switch cabinet can be pulled out more safely; when the connection name on the mark on the rotating disc is located at the reminding position, at this time, the V-shaped protruding table presses the contact of the micro switch on the other side, thereby giving a signal to the switch cabinet to supply power, so that the plug-in switch is turned on, and the purpose is to ensure that the personnel operation is safer.

[0009] Further improvement, the outer end surface of the rotating shaft is provided with an internal hexagonal recess. The function of the internal hexagonal recess is that the interlocking mechanism can be operated manually.

[0010] Further improvement, the shell is provided with a blocking mechanism, the blocking mechanism comprises a positioning plate fixed on the shell, the top end of the positioning plate is rotatably connected with an interlocking block, a square hole is formed in the interlocking block, an eccentric rod is fixed on the interlocking block, a flat surface is formed on the eccentric rod, a vertical plate capable of moving longitudinally is inserted into the shell, a baffle cooperating with the eccentric rod is fixed to the outer end of the vertical plate, and a horizontal plate for blocking the hexagonal recess is fixed to the vertical plate. The blocking mechanism is used for manually blocking or opening the hexagonal recess on the rotating shaft, thereby avoiding misoperation of non-workers; the working principle of the blocking mechanism is that the square rod is inserted into the square hole, then the square rod drives the interlocking block to rotate, the interlocking block rotates and drives the eccentric rod to rotate, and the eccentric rod drives the baffle to move upward, thereby the baffle moves upward and exposes the hexagonal recess, so that subsequent workers can use a hexagonal wrench to rotate the rotating shaft; when it is needed to block the hexagonal recess to avoid misoperation of non-workers, the interlocking block is only needed to be rotated in the opposite direction by using the square rod, so that the eccentric rod is away from the baffle, the baffle automatically moves longitudinally downward by gravity, and the vertical plate covers the hexagonal recess of the rotating shaft; the flat surface is used to place the baffle, so that the square rod does not need to be held, the interlocking block does not rotate, the vertical plate and the limiting rod do not move downward, and one hand is released, and the interlocking block continues to rotate only when the square rod is manually rotated.

[0011] Further improvement, a tension spring for driving the vertical plate to move longitudinally downward is installed between the vertical plate and the shell. The tension spring is used to avoid that the vertical plate is stuck and cannot automatically fall due to uneven force, and the tension spring can automatically move downward to block the hexagonal recess and avoid misoperation of other non-operators on the hexagonal recess.

[0012] Further improvement, a limiting rod capable of moving longitudinally upward is arranged on the shell, a longitudinal insertion hole is formed in the shell, and the top end of the limiting rod is hingedly connected to the interlocking block and cooperates with the longitudinal insertion hole. The limiting rod and the longitudinal insertion hole are used to double-ensure that the switch cabinet drawer cannot be moved when the limiting rod is inserted into the longitudinal insertion hole, thereby avoiding misoperation.

[0013] The utility model has the beneficial effects that:

[0014] 1. The worm can cooperate with the inclined groove on the lock seat, thereby driving the switch cabinet drawer on the cabinet to move;

[0015] 2. The first rotating shaft, the second gear, the third gear, the first chain gear, the mounting seat, the driving motor, the second chain gear and the chain can drive the worm to rotate in an electric form, thereby driving the switch cabinet drawer to move, and compared with the traditional manual opening mode of the switch cabinet drawer, the utility model is safer;

[0016] 3) The second rotating shaft, the fourth gear, the turntable, and the marker can drive the turntable to rotate, thereby driving the worm gear to rotate and simultaneously driving the lock seat, and also driving the marker on the turntable to rotate, thus facilitating the observation and control of the movement of the switch cabinet drawer;

[0017] 4) The blocking mechanism can be used to manually block or open the internal hexagonal groove on the shaft, thereby preventing accidental operation by non-staff members. Attached Figure Description

[0018] Figure 1 The three-dimensional representation of this utility model Figure 1 ;

[0019] Figure 2 The three-dimensional representation of this utility model Figure 2 ;

[0020] Figure 3 The three-dimensional representation of this utility model Figure 3 ;

[0021] Figure 4 The three-dimensional representation of this utility model Figure 4 ;

[0022] Figure 5 The three-dimensional representation of this utility model when the shell is removed Figure 1 ;

[0023] Figure 6 The three-dimensional representation of this utility model when the shell is removed Figure 2 ;

[0024] Figure 7 The three-dimensional representation of this utility model when the shell is removed Figure 3 ;

[0025] Figure 8 This is a perspective view of the V-shaped protrusion area in this utility model;

[0026] Figure 9 This is a perspective view of the second rotating shaft in this utility model;

[0027] Figure 10 This is a perspective view of the eccentric rod region in this utility model;

[0028] Figure 11 for Figure 1 AA cross-section view;

[0029] Figure 12 for Figure 4 BB cross-section;

[0030] Figure 13 This is a perspective view of the lock base used in this utility model;

[0031] Figure 14 The state when the utility model is installed to the switch cabinet drawer Figure 1 ;

[0032] Figure 15 The state when the utility model is installed to the switch cabinet drawer Figure 2 ;

[0033] Figure 16 The working principle diagram of the utility model.

[0034] Mark explanation: shell 1, opening 1-1, worm 1a, rotating shaft 1b, internal hexagonal recess 1b-1, first gear 1c, mark a, V-shaped spring 1-2, jack 1-3, first rotating shaft 2, third gear 3, first chain gear 4, mounting seat 5, driving motor 6, second chain gear 7, chain 8, second rotating shaft 9, V-shaped clamping groove 9-1, recess 9-2, V-shaped convex platform 9-3, fourth gear 10, limiting block 10-1, rotating disc 11, top rod 12, elastic sheet 13, micro switch 14, contact 14-1, blocking mechanism 15, positioning plate 15-1, interlocking block 15-2, square hole 15-2a, vertical plate 15-4, baffle 15-4a, horizontal plate 15-4b, tension spring 15-5, limiting plug 15-6, lock seat 16, helical rack 16-1, switch cabinet frame body 17, switch cabinet drawer 18, socket-type switch 19, plug 19-1, socket 19-2, knob 20, square rod 21. DETAILED DESCRIPTION

[0035] The utility model will be further explained in connection with the drawings:

[0036] Referring to the drawings: this electric propulsion interlocking mechanism, including shell 1, the rotating joint of shell 1 has worm 1a, the outer end surface of worm 1a is fixed with the rotating shaft 1b of the coaxial arrangement of worm 1a, the rotating shaft 1b is fixed with the first gear 1c, shell 1 is provided with the first rotating shaft 2, the first rotating shaft 2 is fixed with the second gear 2a of the meshing of first gear 1c, the first rotating shaft 2 is fixed with the third gear 3 of the opposite arrangement of second gear 2a, the first rotating shaft 2 is fixed with the first chain gear 4, the side end of first chain gear 4 is equipped with mounting seat 5, mounting seat 5 is fixed with driving motor 6, the rotating shaft of driving motor 6 is fixed with second chain gear 7, and first chain gear 4 and second chain gear 7 are installed with chain 8;Shell 1 is provided with second rotating shaft 9, and the fourth gear 10 of the meshing of third gear 3 is fixed on the second rotating shaft 9, and the outer side of second rotating shaft 9 is fixed with rotating disc 11, and the outer end surface of rotating disc 11 is provided with the mark a of separation, test, connection, and shell 1 is opened with the opening 1-1 for observing single mark a.

[0037] The tooth surface of fourth gear 10 is fixed with limiting block 10-1.

[0038] The outer profile surface of the second rotating shaft 9 is provided with three V-shaped clamping grooves 9-1 arranged step by step along the center of the second rotating shaft 9, the V-shaped spring 1-2 is mounted on the shell 1, and the front end of the V-shaped spring 1-2 is clamped in any one of the V-shaped clamping grooves 9-1; the positions of the three names of separation, test and connection marked a correspond to the positions of the three V-shaped clamping grooves 9-1 respectively.

[0039] The shell 1 is provided with a pair of insertion holes 1-3 arranged oppositely, the top rod 12 is inserted into the two insertion holes 1-3, the shell 1 is provided with a pair of elastic sheets 13, one end of the two elastic sheets 13 is fixed on the shell 1, the other end of the two elastic sheets 13 is fixed with the two top rods 12 respectively, the inner end of the second rotating shaft 9 is provided with a recess hole 9-2, the V-shaped protruding table 9-3 is fixed in the recess hole 9-2, the shell 1 is fixed with a pair of micro switches 14, and the contacts 14-1 of the two micro switches 14 are arranged oppositely with the positions of the two top rods 12 respectively.

[0040] The outer end surface of the rotating shaft 1b is provided with an inner hexagonal recess 1b-1.

[0041] The shell 1 is provided with a blocking mechanism 15, the blocking mechanism 15 includes a positioning plate 15-1 fixed on the shell 1, the top end of the positioning plate 15-1 is rotatably connected with a interlocking block 15-2, the interlocking block 15-2 is provided with a square hole 15-2a, the interlocking block 15-2 is fixed with an eccentric rod 15-3, the eccentric rod 15-3 is provided with a flat surface 15-3a, the shell 1 is inserted with a vertical plate 15-4 which can move upward along the longitudinal direction, the outer end of the vertical plate 15-4 is fixed with a baffle 15-4a matched with the eccentric rod 15-3, and the vertical plate 15-4 is fixed with a horizontal plate 15-4b used for blocking the inner hexagonal recess 1b-1.

[0042] The vertical plate 15-4 and the shell 1 are mounted with a tension spring 15-5 which drives the vertical plate 15-4 to move downward along the longitudinal direction.

[0043] The shell 1 is provided with a limiting insertion rod 15-6 which can move upward along the longitudinal direction, the shell 1 is provided with a longitudinal insertion hole 1-4, and the top end of the limiting insertion rod 15-6 is hinged at the interlocking block 15-2 and matched with the longitudinal insertion hole 1-4.

[0044] The utility model discloses a working principle: lock sits 18 fixed on switchgear frame body 17, and electric propulsion interlock mechanism is fixed on switchgear drawer 18, when needing to take out switchgear drawer 18 from switchgear frame body 17, only need to start drive motor 9, and drive motor 9 rotates chain 8 through second chain gear 7, and chain 8 drives first chain gear 4 on first rotating shaft 2 rotation again, and thereby drives second rotating shaft 2 rotation, and further second gear 2a rotates, and the rotation of second gear 2a will synchronously drive first gear 1c rotation, and further drive worm 1a on rotating shaft 1b rotation, and thereby drive switchgear drawer 18 movement (when drive motor 9 starts, and spacing insertion rod 15-6 is to the upward separation switchgear drawer 18, and in the process of second rotating shaft 9 rotation, can give the signal of drive motor 9 stop rotation through two microswitches 14).When the need to start the propulsion interlock mechanism by artificial, only need to rotate the knob 20, thus using the square bar 21 to drive the interlock block 15-2 rotation, thus using the eccentric rod 15-3 on the interlock block 15-2 rotation and drive the baffle 15-4a up and ensure the baffle 15-4a rest at the plane 15-3a, thus make the vertical plate 15-4 up, thus together with the horizontal plate 15-4b up, in turn make the inner hexagonal groove 1b-1 exposed, then, using the inner hexagonal wrench (not shown in the figure) reverse twist the shaft 1b, the worm 1a on the side of the shaft 1b will also rotate, because the inclined rack 16-1 is fixed on the switch cabinet frame 17 is not moving, so the worm 1a rotation will drive the switch cabinet drawer 18 to move outward, at the same time, using the first gear 1c to drive the second gear 2a, the second gear 2a synchronous drive the third gear 3 rotation, in turn drive the fourth gear 10 rotation, the fourth gear 10 rotation while driving the dial 11 rotation, when the test name in the mark a on the dial 11 turn to the reminder position (reminder position refers to the name can be correctly read position) of the opening 1-1, at this time, the V-shaped convex table 9-1 drive just press the contact 14-1 on the one side of the micro switch 14, thus give a signal to the switch cabinet (the meaning of this signal is that the plug 19-1 has not been completely from the socket 19-2, at this time the controller on the switch cabinet will give the plug-in switch 19 power off instruction, to ensure that the subsequent plug 19-1 completely off the socket 19-2, will not produce spark) this time the end of the V-shaped spring 1-2 is also just in the V-shaped slot 9-1 of the second rotating shaft 9, thus give the operator a reminder that the switch cabinet drawer 18 can not be opened, continue to twist the inner hexagonal wrench, drive the shaft 1b continue to rotate, thus drive the dial 11 rotation, when the separation name in the mark a on the dial 11 turn to the reminder position of the opening 1-1, the worm 1a has been completely off the inclined rack 16-1, at this time the V-shaped convex table 9-3 on the second rotating shaft 9 will press the contact 14-1 on the other side of the micro switch 14 through the top rod 12 on the elastic sheet 13, and send a signal (the meaning of this signal is that the plug 19-1 has been completely off the socket 19-2), at this time the end of the V-shaped spring 1-2 is again in the V-shaped slot 9-1 of the second rotating shaft 9, at this time you can safely pull out the switch cabinet drawer 18, at this time, the load power continues to be cut off, thus achieve the next step of the purpose of maintenance operation: the way of installing the micro switch 14 can make the switch cabinet drawer 18 move more safely, because the live state of the switch cabinet drawer 18 (that is, by pulling out the switch cabinet drawer 18 to make the plug 19-1 off the socket 19-2 to cut off the load power), will have security risks (will produce electric spark), so the micro switch 14 will disconnect the load power before pulling out the switch cabinet drawer 18, to ensure that the switch cabinet drawer 18 move more safely, more effective to prevent misoperation;When the plug 19-1 is inserted into the socket 19-2, the V-shaped convex platform 9-3 drives the top rod 12 to press the contact 14-1 on one side of the microswitch 14, so that the plug-in switch 19 is connected to the power supply, further guaranteeing safety, the utility model can pass through the electric propulsion interlocking mechanism, and also can pass through the manual propulsion interlocking mechanism in the emergency, so as to reach the more efficient, safe purpose, and is worth promoting application.

[0045] Although the utility model has been illustrated and described by referring to the preferred embodiments, it should be understood by those skilled in the art that various changes in form and details can be made within the scope of the claims.

Claims

1. An electric propulsion interlock mechanism comprising a housing (1), characterized in that: The shell (1) is rotatably connected with a worm (1a), the outer end surface of the worm (1a) is fixed with a rotating shaft (1b) coaxially arranged with the worm (1a), the rotating shaft (1b) is fixed with a first gear (1c), the shell (1) is provided with a first rotating shaft (2), the first rotating shaft (2) is fixed with a second gear (2a) engaged with the first gear (1c), the first rotating shaft (2) is fixed with a third gear (3) oppositely arranged with the second gear (2a), the first rotating shaft (2) is fixed with a first chain gear (4), the side end of the first chain gear (4) is provided with a mounting seat (5), the mounting seat (5) is fixed with a driving motor (6), the rotating shaft of the driving motor (6) is fixed with a second chain gear (7), the first chain gear (4) and the second chain gear (7) are installed with a chain (8); the shell (1) is provided with a second rotating shaft (9), the second rotating shaft (9) is fixed with a fourth gear (10) engaged with the third gear (3), the outer side of the second rotating shaft (9) is fixed with a rotating disc (11), the outer end surface of the rotating disc (11) is provided with separation, test and connection marks (a), the shell (1) is provided with an opening (1-1) for observing a single mark (a).

2. An electric propulsion interlock mechanism according to claim 1, characterized in that: The tooth surface of the fourth gear (10) is fixed with a limiting block (10-1).

3. An electric propulsion interlock mechanism according to claim 1, wherein: The outer contour surface of the second rotating shaft (9) is provided with three V-shaped clamping grooves (9-1) arranged step by step along the center of the second rotating shaft (9), the shell (1) is installed with a V-shaped spring (1-2), the front end of the V-shaped spring (1-2) is clamped at any one of the V-shaped clamping grooves (9-1); the positions of the three names of separation, test and connection on the mark (a) respectively correspond to the positions of the three V-shaped clamping grooves (9-1).

4. An electric propulsion interlock mechanism according to claim 1, wherein: The shell (1) is provided with a pair of oppositely arranged insertion holes (1-3), the two insertion holes (1-3) are both inserted with a top rod (12), the shell (1) is provided with a pair of elastic sheets (13), one end of the two elastic sheets (13) is fixed on the shell (1), the other end of the two elastic sheets (13) is fixed together with the two top rods (12) respectively, the inner end of the second rotating shaft (9) is provided with a recess (9-2), the recess (9-2) is fixed with a V-shaped protruding table (9-3), the shell (1) is fixed with a pair of micro switches (14), the contacts (14-1) of the two micro switches (14) are oppositely arranged with the positions of the two top rods (12).

5. An electric propulsion interlock mechanism according to claim 1, wherein: The outer end surface of the rotating shaft (1b) is provided with an internal hexagonal recess (1b-1).

6. An electric propulsion interlock mechanism according to claim 5, wherein: The shell (1) is provided with a blocking mechanism (15), the blocking mechanism (15) comprises a positioning plate (15-1) fixed on the shell (1), the top end of the positioning plate (15-1) is rotationally connected with an interlocking block (15-2), a square hole (15-2a) is formed in the interlocking block (15-2), an eccentric rod (15-3) is fixed on the interlocking block (15-2), a flat surface (15-3a) is formed on the eccentric rod (15-3), a vertical plate (15-4) capable of moving longitudinally is inserted into the shell (1), the outer end of the vertical plate (15-4) is fixed with a baffle (15-4a) matched with the eccentric rod (15-3), and a horizontal plate (15-4b) for blocking the internal hexagonal recess (1b-1) is fixed on the vertical plate (15-4).

7. An electric propulsion interlock mechanism according to claim 6, wherein: A tension spring (15-5) for driving the vertical plate (15-4) to move longitudinally downward is arranged between the vertical plate (15-4) and the shell (1).

8. An electric propulsion interlock mechanism according to claim 6 or 7, characterised in that: The shell (1) is provided with a limiting insertion rod (15-6) capable of moving longitudinally upward, a longitudinal insertion hole (1-4) is formed in the shell (1), and the top end of the limiting insertion rod (15-6) is hingedly connected to the interlocking block (15-2) and matched with the longitudinal insertion hole (1-4).

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