Steel bolt mechanism of cabinet door lock

Abstract

The utility model relates to a steel bolt mechanism of a cabinet door lock, which comprises a base, a steel bolt shaft is inserted in a mounting shaft hole of the base, one end of the steel bolt shaft extends out of the mounting shaft hole and is fixedly provided with a steel bolt, and a driven shaft sleeve movably matched in the mounting shaft hole axially extends on a shaft rod for mounting the steel bolt on the steel bolt shaft. A spiral driving groove and an L-shaped guide groove are formed in the driven shaft sleeve, and the L-shaped guide groove comprises a vertical groove hole extending in the axial direction of the driven shaft sleeve and a circumferential groove hole which is connected to the end, away from the extending direction of the steel bolt shaft, of the vertical groove hole and extends in the circumferential direction of the driven shaft sleeve; the driving mandrel is inserted into the driven shaft sleeve, a driving finger inserted into the spiral driving groove is arranged on the driving mandrel, and a guiding pin shaft inserted into the L-shaped guiding groove and matched with the driven shaft sleeve in a guiding mode protrudes in the radial direction of the installation shaft hole of the base. The compression amount is large, the operation hand feeling is good, the structure is simple and compact, and the service life is long.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of lockset, and is exactly steel bolt mechanism and cabinet door lock. BACKGROUND

[0002] The steel bolt of the locking point position of the cabinet door lock is compressed under the existing shaft drive structure, and the compression amount is small, and the operation feels heavy. SUMMARY

[0003] The utility model discloses the purpose of: in order to overcome the defects of prior art, the utility model provides a cabinet door lock's steel bolt mechanism that compression amount is big, and operation feels light, and has the advantages such as simple structure compact and long service life.

[0004] In order to realize the above-mentioned purpose, the utility model provides the following technical scheme:

[0005] A kind of steel bolt mechanism of cabinet door lock, including base, steel bolt shaft is inserted and mounted in the installation shaft hole of base, steel bolt shaft one end extends installation shaft hole and is fixedly installed with steel bolt, it is characterized by: the shaft rod for the steel bolt installation on steel bolt shaft axially extends driven shaft sleeve that is driven in installation shaft hole, driven shaft sleeve is equipped with helical drive groove and L type guide slot, L type guide slot includes vertical slot hole extending along the shaft of driven shaft sleeve, and the circumferential slot hole of being connected in the vertical slot hole end away from the extension direction of steel bolt shaft, driving pin in driven shaft sleeve is positioned rotationally cooperated with driving mandrel in installation shaft hole, driving mandrel is inserted, driving mandrel is equipped with the drive finger of insertion helical drive groove, and the guide pin shaft that is inserted into L type guide slot and guided cooperation with driven shaft sleeve is protruded radially in the installation shaft hole of base.

[0006] Preferably, the base includes a seat shell and a positioning shaft sleeve, the seat shell is formed with a shaft sleeve seat hole, the shaft sleeve seat hole is a stepped shaft, the positioning shaft sleeve is a stepped shaft adapted to be inserted into the shaft sleeve seat hole, the positioning shaft sleeve and the shaft sleeve seat hole wall are axially inserted and rotationally stopped, the guide pin shaft is provided on the positioning shaft sleeve, the driving mandrel is provided with a disc-shaped part, the disc-shaped part is provided with an annular sealing ring groove, a rubber ring is installed in the annular sealing ring groove, the disc-shaped part is sealed with the shaft sleeve seat hole wall through the rubber ring, the positioning shaft sleeve is axially limited in the shaft sleeve seat hole through the stepped surface of the shaft sleeve seat hole and the disc-shaped part, and the seat shell is provided with a limiting part for axially limiting the driving mandrel in the seat shell.

[0007] Preferably, the guide pin shaft is integrally formed on the inner wall of the positioning shaft sleeve, the L-shaped guide slot is arranged on the end of the driven shaft sleeve, and the circumferential slot hole of the L-shaped guide slot is provided with an opening on one side of the width direction of the L-shaped guide slot.

[0008] Preferably, the avoiding hole is an opening-shaped hole slot axially penetrating the end of the positioning shaft sleeve, and the positioning shaft sleeve is provided with a positioning rib in the shaft sleeve seat hole, the positioning rib is inserted into the avoiding hole, and the driving finger is axially inserted into the positioning rib of the avoiding hole and stopped and limited.

[0009] Preferably, the L-shaped guide slot is arranged on the end of the driven shaft sleeve, and the circumferential slot hole of the L-shaped guide slot is provided with an opening on one side of the width direction of the L-shaped guide slot.

[0010] Preferably, the top of the seat shell is provided with a gear assembly cavity, the gear assembly cavity is provided with a driven gear mounted on the driving mandrel, the driven gear is engaged with a tooth-shaped driving piece for driving the driven gear to rotate, the tooth-shaped driving piece is a gear positioned and rotated in the gear assembly cavity, and the limiting piece is a gear box cover covering the gear assembly cavity.

[0011] Preferably, the top of the seat shell is provided with a gear assembly cavity, the gear assembly cavity is provided with a driven gear mounted on the driving mandrel, the driven gear is engaged with a tooth-shaped driving piece for driving the driven gear to rotate, the top of the seat shell is provided with a sliding positioning cavity located on the side of the gear assembly cavity and communicating with the gear assembly cavity, the sliding positioning cavity penetrates the seat shell, the tooth-shaped driving piece is a rack inserted into the sliding positioning cavity and can slide, and the limiting piece is a baffle fixed on the opening of the gear assembly cavity, and the baffle is limited in cooperation with the driven gear and the end of the driving mandrel.

[0012] By adopting the technical scheme, the working principle of the steel bolt mechanism of the cabinet door lock is as follows: unlocking process: the operating driving shaft is rotated to guide the pin shaft to correspond to the vertical slot hole of the L-shaped guide slot, the driven shaft sleeve is guided to move axially by being limited to rotate by the pin shaft, the driving finger on the driving shaft moves along the spiral driving slot, so that the rotating action of the driving shaft drives the driven shaft sleeve to move axially and extend, that is, the steel bolt is loosened axially along the driven shaft sleeve; when the driven shaft sleeve moves axially to the circumferential slot hole of the L-shaped guide slot, the pin shaft is no longer limited to rotate the driven shaft sleeve, the driving finger on the driving shaft pushes the wall of the spiral driving slot, so that the rotating action of the driving shaft drives the driven shaft sleeve to rotate, the steel bolt rotates to cut off the locking position, and the unlocking process is completed; in the locking process: the pin shaft corresponds to the circumferential slot hole of the L-shaped guide slot, the driving finger on the driving shaft pushes the wall of the spiral driving slot, so that the rotating action of the driving shaft drives the driven shaft sleeve to rotate, the steel bolt rotates to the locking position; the driven shaft sleeve rotates to the vertical slot hole position of the L-shaped guide slot, the driven shaft sleeve is limited to rotate in one direction by the pin shaft, the driving finger on the driving shaft moves along the spiral driving slot, so that the rotating action of the driving shaft drives the driven shaft sleeve to move axially and compress, that is, the steel bolt is compressed axially along the driven shaft sleeve, and the locking action is completed. The locking tongue (steel bolt) is rotated by a certain angle (usually 90°) and then compressed vertically (when unlocking, the steel bolt is first loosened at the locking point and then rotated to exit); the compression amount is large, the operation feels light, the service life is longer, and the overall structure is simple and compact.

[0013] The utility model will be further described below in combination with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is steel bolt mechanism structure schematic diagram for the utility model embodiment one cabinet door lock;

[0015] Figure 2 It is the explosion view of steel bolt mechanism structure for the utility model embodiment one cabinet door lock;

[0016] Figure 3 It is the plan view of steel bolt mechanism for the utility model embodiment one cabinet door lock;

[0017] Figure 4 It is Figure 3 It is the sectional view along A-A line;

[0018] Figure 5 It is the cooperation drawing of steel bolt shaft and driving shaft for the utility model embodiment one;

[0019] Figure 6 It is the structure schematic diagram of seat shell for the utility model embodiment one;

[0020] Figure 7The utility model discloses steel bolt mechanism structure schematic diagram of cabinet door lock of embodiment two of the utility model,

[0021] Figure 8 For Figure 7 The sectional view along the line B-B,

[0022] Figure 9 For Figure 7 The sectional view along the line C-C,

[0023] Figure 10 The utility model discloses steel bolt mechanism's explosion view of cabinet door lock of embodiment two of the utility model. Specific implementation

[0024] Referring to the accompanying Figures 1-6 The utility model discloses a kind of steel bolt mechanism of cabinet door lock, including pedestal 1, steel bolt shaft 2 is inserted and installed in the installation shaft hole 11 of pedestal 1, steel bolt shaft 2 one end extends installation shaft hole 11 and is fixedly installed with steel bolt 3, the shaft rod 21 for steel bolt 3 installation on steel bolt shaft 2 extends with driven shaft sleeve 22 in the direction of axis in installation shaft hole 11, driven shaft sleeve 22 is equipped with helical drive slot 221 and L type guide slot 222, helical drive slot 221 and L type guide slot 222 usually are set in pairs, L type guide slot 222 includes vertical slot hole 2221 extending along driven shaft sleeve 22 in the direction of axis, and the circumferential slot hole 2222 extending along driven shaft sleeve 22 in the direction of circumference is connected in the one end a (such as the upper end of vertical slot hole 2221 in the drawing) of vertical slot hole 2221 away from the direction of extension of steel bolt shaft 2, positioning rotation cooperation has driven mandrel 4 in installation shaft hole 11, driven mandrel 4 is inserted in driven shaft sleeve 22, driven mandrel 4 is equipped with the drive finger 41 of insertion helical drive slot 221, in the radial projection of installation shaft hole 11 of pedestal 1 with the guide pin shaft 5 of insertion guide slot 222 and the guide cooperation of driven shaft sleeve 22.

[0025] L type guide slot 222 is arranged at the end of driven shaft sleeve 22, and the side of the circumferential slot hole 2222 of L type guide slot 222 in the width direction is an opening penetrating the axial end surface of driven shaft sleeve 22. Compact structure design is realized, and L type guide slot processing is facilitated.

[0026] In order to improve the reliability of the mechanism, ensure the stable and reliable action of the driven shaft sleeve, the base 1 comprises a seat shell 1-1 and a positioning shaft sleeve 1-2, the seat shell 1-1 is formed with a sleeve seat hole 1-11, the positioning shaft sleeve 1-2 is inserted into the sleeve seat hole 1-11, the positioning shaft sleeve 1-2 is used to provide the installation of the driven shaft sleeve 22, which can improve the machining precision, ensure the stable and reliable action of the driven shaft sleeve 22 after installation, and provide protection; in order to facilitate assembly and realize compact structure design, the sleeve seat hole 1-11 is in the shape of a stepped shaft, the positioning shaft sleeve 1-2 is in the shape of a stepped shaft which is adapted to be inserted into the sleeve seat hole 1-11, the positioning shaft sleeve 1-2 and the sleeve seat hole 1-11 are axially inserted and circumferentially stop rotating after being matched, the guide pin shaft 5 is arranged on the positioning shaft sleeve 1-2, the driving mandrel 4 is provided with a disc-shaped part 42, the disc-shaped part 42 is provided with an annular sealing ring groove, a rubber ring 43 is arranged in the annular sealing ring groove, the disc-shaped part 42 is sealed with the sleeve seat hole 1-11 through the rubber ring 43, the positioning shaft sleeve 1-2 is axially limited in the sleeve seat hole 1-11 through the stepped surface of the sleeve seat hole 1-11 and the disc-shaped part 42, and the seat shell 1-1 is provided with a limiting part 1-3 which axially limits the driving mandrel 4 in the seat shell 1-1. In this way, after the positioning shaft sleeve 1-2 is axially inserted into the sleeve seat hole 1-11, the shaft shoulder of the positioning shaft sleeve 1-2 is limited through the stepped surface, the positioning shaft sleeve 1-2 is axially limited in another direction through the disc-shaped part 42 on the driving mandrel 4, the disc-shaped part 42 simultaneously realizes the positioning of the driving mandrel 4 and the sealing with the sleeve seat hole 1-11, and realizes compact matching.

[0027] The positioning shaft sleeve 1-2 is provided with a pin shaft hole 1-21, the guide pin shaft 5 is inserted into the pin shaft hole 1-21 of the positioning shaft sleeve 1-2, the stepped surface of the sleeve seat hole 1-11 is provided with a stop notch 1-12, the other end of the guide pin shaft 5 inserted into the stop notch 1-12 passes through the pin shaft hole 1-21 and is inserted into the stop notch 1-12, when the positioning shaft sleeve 1-2 is axially inserted into the sleeve seat hole 1-11, the end of the guide pin shaft 5 is inserted into the opening on the stepped surface corresponding to the stop notch 1-12. The guide pin shaft 5 simultaneously realizes the positioning of the positioning shaft sleeve and the rotation stop of the positioning shaft sleeve inserted into the sleeve seat hole; has the advantage of compact structure. Figure 2 and 5 As shown, of course, the flat surface 1-22 on the positioning shaft sleeve 1-2 and the flat surface in the sleeve seat hole 1-11 can be used to realize rotation stop.

[0028] In addition, as shown in Figures 6-10As shown in the figure, another embodiment of the utility model, the guide pin shaft 5 still can adopt integral forming in the inner wall of positioning shaft sleeve 1-2, and then can make full use of the structure design of L type guide groove 222 to carry out corresponding assembly cooperation (specifically: the L type guide groove 222 is arranged at the end of driven shaft sleeve 22, and the circumferential groove hole 2222 of L type guide groove 222 is arranged on the side of width direction of opening of the axial end surface of driven shaft sleeve 22), the guide pin shaft 5 is inserted into L type guide groove 222 with driven shaft sleeve 22 inserted into positioning shaft sleeve 1-2, and the avoiding hole 1-23 corresponding to the position of spiral drive groove 221 is arranged on the positioning shaft sleeve 1-2, the drive finger 41 is inserted into the drive mandrel 4 after passing through the spiral drive groove 221 along the avoiding hole 1-23, the driven shaft sleeve 22, the drive mandrel 4 and the positioning shaft sleeve 1-2 are axially sleeved and then inserted into the drive finger 41 to realize assembly operation, and then are inserted into the shaft sleeve seat hole 1-11, which has the advantages of simple and convenient assembly. Furthermore, the avoiding hole 1-23 is an opening-shaped hole groove axially penetrating the end of the positioning shaft sleeve 1-2, the positioning boss 1-13 is arranged in the shaft sleeve seat hole 1-11, the positioning boss 1-13 is inserted into the avoiding hole 1-23, and the drive finger 41 is axially stopped and limited by the positioning boss 1-13 inserted into the avoiding hole 1-23. The avoiding hole and the positioning boss realize the rotation-stopping cooperation of the positioning shaft sleeve and the shaft sleeve seat hole, and the positioning boss axially limits the drive finger. Meanwhile, the retaining catch 1-12 is concavely arranged on the stepped surface reserved in the shaft sleeve seat hole 1-11, and the positioning boss 1-24 is formed on the positioning shaft sleeve 1-2, the positioning boss is inserted into the retaining catch 1-12 to realize positioning and stopping.

[0029] In the specific embodiment, the steel bolt mechanism is driven by a gear, and of course other driving forms can also be used according to the application environment of the steel bolt mechanism, such as directly forming a driving shaft head, and a person skilled in the art can make corresponding configurations according to needs; for the driving mode of the steel bolt mechanism realized by sliding traction, the following design is used, specifically as shown in the figure: Figures 7-10 As shown in the figure, the seat shell 1-1 is provided with a gear assembly cavity at the top, the gear assembly cavity is provided with a driven gear 6 mounted on the drive mandrel 4, the driven gear 6 is engaged with a toothed driving member 7 for driving the driven gear 6 to rotate, the seat shell 1-1 is provided with a sliding positioning cavity located at the side of the gear assembly cavity and communicating with the gear assembly cavity at the top, the sliding positioning cavity penetrates the seat shell 1-1, the toothed driving member 7 is a rack inserted into the sliding positioning cavity and can slide, and the limiting piece 1-3 is a strip fixed at the opening of the gear assembly cavity, the strip is fixed by screws, and the strip is limited in cooperation with the end of the driven gear 6 and the drive mandrel 4. The overall installation structure is simple and compact, and assembly is convenient.

[0030] As another application scenario of the utility model, as shown in the figure: Figures 1-6The seat shell 1-1 is provided with a gear assembly cavity at the top, and a driven gear 6 is arranged on the driving core shaft 4 in the gear assembly cavity. The driven gear 6 is engaged with a toothed driving piece 7 that drives the rotation of the driven gear 6. The toothed driving piece 7 is a gear that is rotationally positioned in the gear assembly cavity. The limiting piece 1-3 is a gear cover that covers the gear assembly cavity.

[0031] The unlocking process of the steel bolt mechanism of the cabinet door lock: the driving core shaft 4 is rotated, and the guide pin shaft 5 is correspondingly arranged in the vertical slot hole 2221 of the L-shaped guide slot 222. Then the driven shaft sleeve 22 is guided to move axially by limiting the rotation of the guide pin shaft 5. The driving finger 41 on the driving core shaft 4 moves along the spiral driving slot 221, so that the rotation of the driving core shaft 4 drives the axial movement of the driven shaft sleeve 22 to extend, that is, the steel bolt 3 on the steel bolt shaft 2 is loosened axially along the driven shaft sleeve 22. When the driven shaft sleeve 22 moves axially to the circumferential slot hole 2222 of the L-shaped guide slot 222, the guide pin shaft 5 releases the rotation restriction of the driven shaft sleeve 22, and the driving finger 41 on the driving core shaft 4 pushes the wall of the spiral driving slot 221, so that the rotation of the driving core shaft 4 drives the rotation of the driven shaft sleeve 22. The steel bolt 3 rotates and cuts out the locking position, completing the unlocking process. When unlocking, the lock tongue (steel bolt) is first loosened vertically and then rotated by a certain angle.

[0032] In the locking process: the guide pin shaft 5 is correspondingly arranged in the circumferential slot hole 2222 of the L-shaped guide slot 222, and the driving finger 41 on the driving core shaft 4 pushes the wall of the spiral driving slot 221, so that the rotation of the driving core shaft 4 drives the rotation of the driven shaft sleeve 22, and the steel bolt 3 rotates to the locking position. The driven shaft sleeve 22 is rotated to the vertical slot hole 2221 of the L-shaped guide slot 222, and the driven shaft sleeve 22 is limited to one-way rotation by the guide pin shaft 5. The driving finger 41 on the driving core shaft 4 moves along the spiral driving slot 221, so that the rotation of the driving core shaft 4 drives the axial movement of the driven shaft sleeve 22 to compress, that is, the steel bolt is axially compressed to the door plate along the driven shaft sleeve, and the locking action is completed. The lock tongue (steel bolt) is rotated by a certain angle (usually 90°) and then vertically compressed.

[0033] The lock tongue (steel bolt) is rotated by a certain angle (usually 90°) and then vertically compressed. It has the advantages of large compression amount, light operation feeling, and longer service life. Moreover, the overall structure is simple and compact.

Claims

1. A steel bolt mechanism of a cabinet door lock, comprising a base (1), a steel bolt shaft (2) is inserted and fixed in a mounting shaft hole (11) of the base (1), one end of the steel bolt shaft (2) extends out of the mounting shaft hole (11) and is fixedly mounted with a steel bolt (3), characterized in that: The shaft rod (21) of the steel bolt shaft (2) for installing the steel bolt (3) has a driven shaft sleeve (22) axially extending in the installation shaft hole (11), the driven shaft sleeve (22) is provided with a spiral driving groove (221) and an L-shaped guide groove (222), the L-shaped guide groove (222) includes a vertical slot hole (2221) extending along the driven shaft sleeve (22) in the axial direction, and a circumferential slot hole (2222) extending along the driven shaft sleeve (22) in the circumferential direction and connected to one end of the vertical slot hole (2221) away from the extension direction of the steel bolt shaft (2), a driving mandrel (4) is positioned and rotationally fitted in the installation shaft hole (11), the driving mandrel (4) is inserted into the driven shaft sleeve (22), the driving mandrel (4) is provided with a driving finger (41) inserted into the spiral driving groove (221), and a guide pin shaft (5) is radially protruded from the installation shaft hole (11) of the base (1) and inserted into the L-shaped guide groove (222) to guide and cooperate with the driven shaft sleeve (22).

2. A steel bolt mechanism for a cabinet door lock according to claim 1, characterized in that: The base (1) includes a seat shell (1-1) and a positioning shaft sleeve (1-2), the seat shell (1-1) is formed with a shaft sleeve seat hole (1-11), the shaft sleeve seat hole (1-11) is a stepped shaft, the positioning shaft sleeve (1-2) is a stepped shaft adapted to be inserted into the shaft sleeve seat hole (1-11), the positioning shaft sleeve (1-2) and the shaft sleeve seat hole (1-11) are axially inserted and circumferentially stop rotating, the guide pin shaft (5) is arranged on the positioning shaft sleeve (1-2), the driving mandrel (4) is provided with a disc-shaped part (42), the disc-shaped part (42) is provided with an annular sealing ring groove, a rubber ring (43) is arranged in the annular sealing ring groove, the disc-shaped part (42) is sealed and cooperated with the shaft sleeve seat hole wall through the rubber ring (43), the positioning shaft sleeve (1-2) is axially limited in the shaft sleeve seat hole (1-11) through the stepped surface of the shaft sleeve seat hole (1-11) and the disc-shaped part (42), and the seat shell (1-1) is provided with a limiting part (1-3) for axially limiting the driving mandrel (4) in the seat shell (1-1).

3. A keeper mechanism for a cabinet door lock according to claim 2, wherein: The guide pin shaft (5) is integrally formed on the inner wall of the positioning shaft sleeve (1-2), the L-shaped guide slot (222) is arranged on the end of the driven shaft sleeve (22), and the circumferential slot hole (2222) of the L-shaped guide slot (222) is provided with an opening on one side in the width direction and penetrates the axial end surface of the driven shaft sleeve (22); the guide pin shaft (5) is inserted into the L-shaped guide slot (222) when the driven shaft sleeve (22) is inserted into the positioning shaft sleeve (1-2); the positioning shaft sleeve (1-2) is provided with an avoiding hole (1-23) corresponding to the position of the spiral driving slot (221); the driving finger (41) is inserted into the driving core shaft (4) after passing through the spiral driving slot (221) along the avoiding hole (1-23); or the positioning shaft sleeve (1-2) is provided with a pin shaft hole (1-21), the guide pin shaft (5) is inserted into the pin shaft hole (1-21) of the positioning shaft sleeve (1-2), the stepped surface of the shaft sleeve seat hole (1-11) is provided with a stop buckle (1-12), and the other end of the guide pin shaft (5) inserted into the L-shaped guide slot (222) is inserted into the stop buckle (1-12) through the pin shaft hole (1-21).

4. A keeper mechanism for a cabinet door lock as defined in claim 3 wherein: The avoiding hole (1-23) is an open hole slot penetrating the end of the positioning shaft sleeve (1-2), the positioning shaft sleeve (1-2) is provided with a positioning convex rib (1-13) in the shaft sleeve seat hole (1-11), the positioning convex rib (1-13) is inserted into the avoiding hole (1-23), and the driving finger (41) is axially stopped and limited by the positioning convex rib (1-13) inserted into the avoiding hole (1-23).

5. The steel bolt mechanism of the cabinet door lock according to claim 1, characterized in that: The L-shaped guide slot (222) is arranged on the end of the driven shaft sleeve (22), and the circumferential slot hole (2222) of the L-shaped guide slot (222) is provided with an opening on one side in the width direction and penetrates the axial end surface of the driven shaft sleeve (22).

6. The steel bolt mechanism of the cabinet door lock according to claim 2, characterized in that: The seat shell (1-1) is provided with a gear assembly cavity at the top, the driven gear (6) is arranged on the driving core shaft (4) in the gear assembly cavity, the driven gear (6) is engaged with the tooth-shaped driving piece (7) for driving the driven gear (6) to rotate, the tooth-shaped driving piece (7) is a gear positioned and matched in the gear assembly cavity, and the limiting piece (1-3) is a gear box cover covering the gear assembly cavity.

7. The steel bolt mechanism of the cabinet door lock according to claim 2, characterized in that: The seat shell (1-1) is provided with a gear assembly cavity at the top, the driven gear (6) is arranged on the driving core shaft (4) in the gear assembly cavity, the driven gear (6) is engaged with the tooth-shaped driving piece (7) for driving the driven gear (6) to rotate, the seat shell (1-1) is provided with a sliding positioning cavity located on the side of the gear assembly cavity and communicating with the gear assembly cavity at the top, the sliding positioning cavity penetrates the seat shell (1-1), the tooth-shaped driving piece (7) is a rack inserted into the sliding positioning cavity and can slide, and the limiting piece (1-3) is a baffle fixed at the opening of the gear assembly cavity, and the baffle is limited and matched with the driven gear (6) and the end of the driving core shaft (4).

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