CN107130843B

CN107130843B - Clutch device of intelligent anti-theft lock body

Info

Publication number: CN107130843B
Application number: CN201710577561.1A
Authority: CN
Inventors: 刘小华
Original assignee: Lanxi Zhijie Intelligent Lock Co ltd
Current assignee: Lanxi Zhijie Intelligent Lock Co ltd
Priority date: 2017-07-15
Filing date: 2017-07-15
Publication date: 2022-04-01
Anticipated expiration: 2037-07-15
Also published as: CN107130843A

Abstract

The invention relates to a clutch device of an intelligent anti-theft lock body, wherein a driver (11) and a clutch device (20) are adjacently installed in a lock body (12), the driver (11) is provided with a driving push rod (111), one surface of the driving push rod (111) in contact with the clutch device (20) is in an arc shape, a shifting sheet (2) of the clutch device (20) is installed on a square hole shaft (1), the square hole shaft (1) is provided with a square hole (30), a clutch pin (3), an upper lock pin (4), the upper lock pin (4) and an upper lock spring (61) are installed between the square hole shaft (1) and the shifting sheet (2) through a snap spring (5) and a clutch spring (6), and an outer square rod (7) penetrates through a protection plate (9) to be connected with an inner square rod (8) and is installed in the square hole shaft (1). The invention has the following advantages: 1. the production cost is low. 2. The unlocking is convenient. 3. The user safety is improved. 4. The device has wide applicability.

Description

Clutch device of intelligent anti-theft lock body

Technical Field

The invention relates to a clutch device, in particular to an electronic intelligent control clutch device of an anti-theft lock body.

Background

The existing electronic anti-theft lock bodies are also specially designed and developed, so that the adaptability is difficult, the electronic anti-theft lock bodies in the market are all special structures aiming at the diversity of lock body styles, and no electronic anti-theft lock body can adapt to the structure. Resulting in high cost and poor stability.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: aiming at various defects and deficiencies of the prior art, the clutch device of the anti-theft lock body designed on the original mechanical lock body is provided.

The specific technical scheme of the invention is as follows: the utility model provides an intelligent anti-theft lock body's clutch, including the driver, lock body and clutch, driver and clutch are adjacent installs in the lock body, the driver is equipped with drive push rod, the one side that drive push rod and clutch contacted is convex, clutch includes the square hole axle, the plectrum, the separation and reunion round pin, go up the lockpin, the jump ring, the separation and reunion spring, go up the locking spring, the outside pole, interior square pole, screening glass and pin, the square hole axle is installed on the plectrum, the square hole axle is equipped with the square hole, separation and reunion round pin and separation and reunion spring pass through the jump ring and install between square hole axle and plectrum, go up the lockpin and go up the locking spring and install between square hole axle and plectrum through the jump ring, the outside pole passes the screening glass and is connected with interior square pole and installs in the square hole axle.

Furthermore, the square hole of the square hole shaft 1 is a through hole, the square hole shaft is square, the outer side of the square hole shaft can be 4 or 6, the included angle of the outer wall of the square hole shaft is arc-shaped, the included angle of the arc-shaped shaft is provided with steps, the steps are two or more than two steps, two opposite side surfaces of the square hole shaft are provided with shaft pin holes, the shaft pin holes penetrate through the square hole, the outer circle of each shaft pin hole does not exceed the center position of the square hole, and the diameter of each shaft pin hole is larger than or equal to half of the side length of the square hole.

Furthermore, a fixed square hole matched with the square hole shaft is formed in the shifting piece, pin gears are arranged on two sides of the shifting piece, gear pin holes are formed in the pin gears, and a main lock shifting foot and an oblique bolt shifting foot are respectively arranged at the upper end and the lower end of the shifting piece.

Furthermore, the clutch pin and the upper locking pin are provided with clamping ring grooves, and the clamping ring grooves are matched with the clamping springs for installation.

Furthermore, the foreign side pole is equipped with the stalk portion, and the stalk portion is square, is equipped with the round bar with stalk portion fixed connection, and the diameter of round bar equals with the length of side of stalk portion, is equipped with the round pin mouth on the round bar, and the width and the degree of depth of round pin mouth are greater than half of square hole length of side, and the round bar front end is equipped with the connecting axle, and it has the cotter way to open on the connecting axle, the screening glass is equipped with the hole, and the hole diameter is unanimous with the round bar diameter, the biggest diagonal of terminal surface of the excircle diameter more than or equal to square hole axle of screening glass.

Furthermore, an inner square rod shaft hole is formed in one end of the inner square rod, an inner square rod pin hole is formed in the position, corresponding to the inner square rod shaft hole, of the outer side of the inner square rod, the inner square rod pin hole penetrates through the inner square rod shaft hole, a spring piece groove is formed in one side of the inner square rod, a rivet hole is formed in the spring piece groove, and the spring piece is installed in the spring piece groove and fixed through rivets.

Furthermore, the depth and the length of the spring piece groove are larger than those of the spring piece, and the depth and the length of the spring piece groove are not higher than the side face of the inner square rod after the rivet is fixed.

The working principle is as follows: a shifting piece is arranged in the direction of the step corresponding position on the square hole shaft, a pin stop on the shifting piece is vertical to a shaft pin hole on the square hole shaft, and a stop pin hole on the shifting piece is coaxial with the shaft pin hole; a clutch spring is placed between a plectrum pin stop and a square hole shaft, the clutch pin penetrates through a stop pin hole and enters one surface of a shaft pin hole of the square hole shaft through the clutch spring, a snap spring is fixed on a snap ring groove of the clutch pin between the pin stop and the clutch spring, the default state of the clutch pin is a disconnection state at the moment, the clutch spring exerts force between the square hole shaft and a snap ring on the clutch pin to push the clutch pin to the pin stop, the clutch pin leaves the square hole of the square hole shaft, and the clutch pin is flat or lower than the square hole at the moment and is in a disconnection state; installing an upper lock pin spring between the pin stop and the square hole shaft at the other side, wherein the upper lock pin passes through the upper lock pin spring through the pin hole of the pin stop and enters the other side of the shaft pin hole of the square hole shaft, and the square hole shaft and the upper lock pin spring are fixed on a clamping ring groove of the upper lock pin by using a clamping spring; at the moment, the upper locking pin spring is arranged between the pin stopper and the clamping ring, the default of the upper locking pin is that the upper locking pin enters the square hole of the square hole shaft, and the depth of the upper locking pin entering the square hole is less than or equal to half of the side length of the square hole. The clutch device is arranged at the square shaft position of the lock body, and the driving component is arranged at the corresponding position of the lock body; the lock body is assembled, and the common anti-theft lock body is changed into a reliable intelligent control lock body. The intelligent control driving assembly controls the push rod to move linearly to control the clutch pin to move linearly, so that the clutch pin is controlled to be closed or opened, the square rod accessory group is combined to realize that the outside is locked at any time, the lock can be unlocked through intelligent control, and the inside can directly realize the functions of unlocking and locking.

The intelligent lock body clutch and square rod accessory realizes clutch locking and unlocking, a protection plate is sleeved at a round rod of an outer square rod, a connecting shaft of the outer square rod is installed in a shaft hole of an inner square rod, a pin is installed in a pin groove of the connecting shaft through a pin hole of the inner square rod to realize mutual rotation of the inner square rod and the outer square rod, a spring plate is placed in a spring plate groove of the inner square rod, a hole matched with a rivet is formed in the fixed end of the spring plate, the spring plate is fixed on the inner square rod through the rivet hole by the rivet, and the surface of the rivet is not higher than that of the inner square rod after the rivet is fixed; according to the requirement of controlling the door to open from inside and outside, one side of the inner square rod enters from the square hole at one side of the square hole shaft, the upper lock pin is withdrawn from the square hole by a tool, because the elastic sheet on the inner square rod is obliquely installed, when the inner square rod enters the square hole, the elastic sheet can be flattened into the elastic sheet groove, the square rod accessory group can penetrate through the square hole of the square hole shaft until the protection sheet covers the end face of the square hole shaft, at the moment, the elastic sheet on the inner square rod also exceeds the square hole of the square hole shaft, the elastic sheet bounces, the pin hole on the outer square rod just corresponds to the clutch pin and the upper locking pin, the upper locking pin can automatically fall into the pin hole by rotating the outer square rod anticlockwise, the surface of the pin port corresponds to the axial surface of the upper lock pin, so that the outer square rod can not rotate, and then the pin port surface of the outer square rod is rotated to drive the square hole shaft and the shifting piece through the axial surface of the upper lock pin, so that the locking action of the anti-theft lock body structure group is driven, and the main lock of the lock is locked; if the square bar clockwise rotation outside, because the separation and reunion round pin is the default and is the off-state, the face of the round pin mouth of outside pole can with the terminal surface department of meeting of the round pin of locking, the face of round pin mouth at this moment can be with the round pin pressure of locking retreat until the back of round pin mouth corresponds the lockpin, at this moment go up the lockpin and just withdraw from the square hole completely, the square bar subassembly can be through will pressing the shell fragment of interior square bar and impress in the shell fragment groove and take out from the square hole of square hole axle. Through intelligent control drive assembly's push rod when opening the door, the push rod can promote the separation and reunion round pin and enter into square hole and round pin mouth in, clockwise rotation outside square bar this moment, the face of round pin mouth will contact with the axial plane of separation and reunion round pin, and the axial plane that the face that the outside square bar just passes through the round pin mouth promptly drives square hole axle and plectrum clockwise rotation and realizes the lock body action of opening a door, with all spring bolts retractions. And (4) finishing the intelligent unlocking command, retracting the push rod, and enabling the clutch pin to be withdrawn from the square hole and the pin opening by the spring. And then the outer square rod is rotated clockwise to be in an idle running state, and the lock enters a protection state. The junction of interior square bar and outside square bar is located the square hole, so interior square bar can directly lock or unblank, because interior square bar is in the inboard of locking a door, such design can be for indoor people can lock a door fast and open the door and provide convenient. Because the inside square pole be equipped with the shell fragment, can't take out square pole group outdoors, and the round bar department of outside square pole is equipped with the screening glass, and screening glass self can 360 rotations, and the direction of unblanking of outside square pole is idle running state, can protect like this even the panel handle on with the door is demolishd also can't open the lock to realize the maximum safety protection of lock.

Due to the adoption of the technical scheme, the invention has the following advantages: 1. the device has simple structure, easy production and low production cost. 2. Become intelligent lock body with mechanical lock, conveniently unblank. 3. This device stability is high, improves user security. 4. The device has wide applicability and can be suitable for various mechanical locks.

Drawings

FIG. 1: is a schematic diagram of the explosive structure of the invention.

FIG. 2: is a schematic view of the closed cross-sectional structure in top view.

FIG. 3: is a schematic view of the broken cross-sectional structure in the top view of the present invention.

FIG. 4: is a schematic view of the exploded cross-section structure of the inner square rod of the present invention.

FIG. 5: is a structural schematic diagram of the right view of the shifting sheet.

FIG. 6: is a schematic structural diagram of a main view section of the square hole shaft.

FIG. 7: the invention discloses a clutch disconnection schematic diagram of an intelligent anti-theft lock body assembly.

FIG. 8: the invention discloses a schematic diagram of the intelligent control driving push rod clutch closing of an intelligent anti-theft lock body.

Detailed Description

Embodiments of the present invention are described with reference to the accompanying drawings.

As shown in fig. 1 to 8, a clutch device of an intelligent anti-theft lock body comprises a driver 11, a lock body 12 and a clutch device 20, wherein the driver 11 and the clutch device 20 are adjacently installed in the lock body 12, the driver 11 is provided with a driving push rod 111, one surface of the driving push rod 111, which is contacted with the clutch device 20, is in a circular arc shape, the clutch device 20 comprises a square hole shaft 1, a shifting plate 2, a clutch pin 3, an upper lock pin 4, a clamp spring 5, a clutch spring 6, an outer square rod 7, an inner square rod 8, a protection plate 9 and a pin 10, the square hole shaft 1 is installed on the shifting plate 2, the square hole shaft 1 is provided with a square hole 30, the clutch pin 3 and the clutch spring 6 are installed between the square hole shaft 1 and the shifting plate 2 through the clamp spring 5, the upper lock pin 4 and the upper lock spring 61 are installed between the square hole shaft 1 and the shifting plate 2 through the clamp spring 5, and the outer square hole shaft 7 is connected with the inner square rod 8 through the clamp spring 9 and installed in the square hole shaft 1.

The square hole 30 of the square hole shaft 1 is a through hole, the square hole shaft 1 is square, the outer side can be 4 or 6, the included angle of the outer wall is arc-shaped, a step 32 is arranged at the included angle of the arc-shaped, the step 32 is two or more, two opposite side surfaces of the square hole shaft 1 are provided with shaft pin holes 31, the shaft pin holes 31 penetrate through the square hole 30, the outer circle of each shaft pin hole 31 does not exceed the center position of the square hole 30, and the diameter of each shaft pin hole 31 is larger than or equal to half of the side length of the square hole 30.

The shifting piece 2 is provided with a fixed square hole 23 matched with the square hole shaft 1, two sides of the shifting piece 2 are provided with pin stops 21, the pin stops 21 are provided with stop pin holes 22, and the upper end and the lower end of the shifting piece 2 are respectively provided with a main lock shifting pin 24 and an oblique bolt shifting pin 25.

The clutch pin 3 and the upper locking pin 4 are both provided with clamping ring grooves, and the clamping ring grooves are installed in a matched mode with the clamping springs 5.

The outside pole 7 be equipped with stalk portion 75, stalk portion 75 is square, is equipped with round bar 71 with stalk portion 75 fixed connection, the diameter of round bar 71 equals with the length of a side of stalk portion 75, is equipped with round pin mouth 72 on the round bar 71, and the width and the degree of depth of round pin mouth 72 are greater than the half of the 30 length of a side of square hole, and round bar 71 front end is equipped with connecting axle 73, and it has cotter way 74 to open on the connecting axle 73, protection sheet 9 is equipped with the hole, and hole diameter is unanimous with round bar 71 diameter size, and the excircle diameter more than or equal to the biggest diagonal of terminal surface of square hole axle 1 of protection sheet 9.

One end of the inner square rod 8 is provided with an inner square rod shaft hole 81, the outer side of the inner square rod 8 is provided with an inner square rod pin hole 82 corresponding to the inner square rod shaft hole 81, the inner square rod pin hole 82 penetrates through the inner square rod shaft hole 81, one side of the inner square rod 8 is provided with a spring sheet groove 83, a rivet hole 84 is formed in the spring sheet groove 83, and a spring sheet 86 is arranged in the spring sheet groove 83 and fixed by a rivet 85.

The depth and the length of the elastic sheet groove 83 are larger than the thickness and the length of the elastic sheet 86, and the height of the rivet 85 after the fixing is not higher than the side surface of the inner square rod 8.

A shifting piece 2 is arranged in the direction of a position corresponding to a step 32 on a square hole shaft 1, a pin stop 21 on the shifting piece 2 is vertical to a shaft pin hole 31 on the square hole shaft 1, and a stop pin hole 22 on the shifting piece 2 is coaxial with the shaft pin hole 31; the clutch spring 6 is placed between the pin stop 21 of the plectrum 2 and the square hole shaft 1, the clutch pin 3 passes through the stop pin hole 22, passes through the clutch spring 6 and enters one surface of the shaft pin hole 31 of the square hole shaft 1, the part between the pin stop 21 and the clutch spring 6 is fixed on the snap ring groove of the clutch pin 3 by the snap spring 5, at the moment, the default state of the clutch pin 3 is a disconnection state, the clutch spring 6 exerts force between the square hole shaft 1 and the snap ring 5 on the clutch pin 3, the clutch pin 3 is pushed to the pin stop 21, the clutch pin 3 is separated from the square hole 30 of the square hole shaft 1, and at the moment, the clutch pin 3 is flat or lower than the square hole 30 and is in a disconnection state; installing an upper locking pin spring 61 between the pin stop 21 and the square hole shaft 1 on the other side, enabling an upper locking pin 4 to pass through the upper locking pin spring 61 through the pin hole of the pin stop 21 and enter the other side of the shaft pin hole 31 of the square hole shaft 1, and fixing the square hole shaft 1 and the upper locking pin spring 61 on a clamping ring groove of the upper locking pin 4 by using a clamping spring 5; at this time, since the upper lock spring 61 is located between the pin stopper 21 and the snap ring 5, the upper lock pin is allowed to enter the square hole 30 of the square hole shaft 1 by default, and the depth of the upper lock pin 4 entering the square hole 30 is equal to or less than half of the side length of the square hole. The clutch device is arranged at the square shaft position of the lock body 12, and the driving component 11 is arranged at the corresponding position of the lock body 12; the lock body is assembled, and the common anti-theft lock body is changed into a reliable intelligent control lock body. The clutch pin 3 is controlled to move linearly by controlling the push rod 111 to move linearly through the intelligent control driving assembly, so that the closing or opening is controlled, the outside is locked at any time by combining the square rod accessory group, the lock can be unlocked only through intelligent control, and the inside can directly realize the functions of unlocking and locking.

The intelligent lock body clutch and square bar accessory realizes the clutch locking and unlocking, firstly, the protection plate 9 is sleeved at the round bar 71 of the outer square bar 7, the connecting shaft 73 of the outer square bar 7 is arranged in the shaft hole 81 of the inner square bar 8, the pin 10 is arranged in the pin groove 74 of the connecting shaft 73 through the pin hole 82 of the inner square bar to realize the mutual rotation of the inner square bar and the outer square bar, the elastic sheet 86 is arranged in the elastic sheet groove 83 of the inner square bar 8, the fixed end of the elastic sheet 86 is provided with a hole matched with the rivet 85, the elastic sheet 86 is fixed on the inner square bar 8 through the rivet hole 84 by the rivet 85, and the surface of the rivet 85 is not higher than the surface of the inner square bar 8 after the fixation; according to the requirement of controlling the door to open the door from inside and outside, one side of the inner square rod 8 enters from the square hole 30 on one side of the square hole shaft 1, the upper lock pin 4 exits from the square hole 30 by a tool, because the elastic sheet 86 on the inner square rod 8 is installed obliquely, when the inner square rod 8 enters the square hole 30, the elastic sheet 86 can be flattened into the elastic sheet groove, the square rod accessory group can penetrate through the square hole 30 of the square hole shaft 1 until the protection sheet 9 covers the end surface of the square hole shaft 1, at the moment, the elastic sheet 86 on the inner square rod 8 also exceeds the square hole 30 of the square hole shaft 1, the elastic sheet 86 bounces, at the moment, the pin port 72 on the outer square rod 7 just corresponds to the clutch pin 3 and the upper lock pin 4, at the moment, the upper lock pin 4 can automatically fall into the pin port 72 by rotating the outer square rod 1 anticlockwise, the surface of the pin port 72 corresponds to the axial surface of the upper lock pin 4, so that the outer square rod 7 can not rotate again, and the surface of the pin port 72 of the outer square rod can drive the square hole shaft 1 and the shifting sheet 2 through the axial surface of the upper lock pin 4, the locking action of the anti-theft lock body structure group is driven by rotation, and the main lock of the lock is locked; if the outer square rod 7 rotates clockwise, because the clutch pin 3 is in the off state by default, the surface of the pin opening 72 of the outer square rod 7 is connected with the end surface of the upper lock pin 4, at this time, the surface of the pin opening 72 presses the upper lock pin 4 to retreat until the back surface of the pin opening 72 corresponds to the upper lock pin 4, at this time, the upper lock pin 4 just completely exits from the square hole 30, and the square rod assembly can be pulled out from the square hole 30 of the square hole shaft 1 by pressing the elastic sheet 86 on the pressing inner square rod 8 into the elastic sheet groove 82. Through intelligent control drive assembly 11's push rod 111 during the door opening, push rod 111 can promote separation and reunion round pin 3 and enter into square hole 30 and round pin mouth 72 in, clockwise rotation outside square bar 1 again this moment, the face of round pin mouth 72 will contact with the axial plane of separation and reunion round pin 3, the axial plane that just passes through separation and reunion round pin through the face of round pin mouth 72 of outside square bar 1 soon realizes the action of opening the door of lock body 12, with all spring bolts retractions. The smart unlock command is ended, the push rod 111 is retracted, and the clutch pin is withdrawn from the square hole 30 and the pin opening 72 by the spring 6. And then the outer square rod is rotated clockwise to be in an idle running state, and the lock enters a protection state. The junction of interior square bar 8 and outside pole 7 is located square hole 30, and institute can directly lock or unblank with interior square bar 8, because interior square bar 8 is in the inboard of locking a door, such design can be for indoor people can lock a door fast and open the door and provide convenient. Because the shell fragment 86 that is equipped with of inside square pole 8, can't take out the square pole group outside the door, and round bar 71 department of outside square pole 7 is equipped with screening glass 9, and screening glass 9 self can 360 rotations, and the direction of unblanking of outside square pole 7 is idle running state, can protect like this even with panel handle on the door demolish also can't open the lock to realize the maximum safety protection of lock.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a clutch of intelligence theftproof lock body, clutch (20) and driver (11) and adjacent installation in lock body (12), its characterized in that: the driver (11) is provided with a driving push rod (111), one surface of the driving push rod (111) contacting with the clutch device (20) is arc-shaped, the clutch device (20) comprises a square hole shaft (1), a shifting sheet (2), a clutch pin (3), an upper lock pin (4), a clamp spring (5), a clutch spring (6), an upper lock spring (61), an outer square rod (7), an inner square rod (8), a protection sheet (9) and a pin (10), the shifting sheet (2) is arranged on the square hole shaft (1), the square hole shaft (1) is provided with a square hole (30), the clutch pin (3) and the clutch spring (6) are arranged between the square hole shaft (1) and the shifting sheet (2) through the clamp spring (5), the upper lock pin (4) and the upper lock spring (61) are arranged between the square hole shaft (1) and the shifting sheet (2) through the clamp spring (5), the outer square rod (7) penetrates through the square hole shaft (9) to be connected with the inner square rod (8) and is arranged in the square hole shaft (1), the square hole (30) of the square hole shaft (1) is a through hole, the square hole shaft (1) is square in shape, the included angle of the outer wall of the square hole shaft is arc-shaped, the included angle of the arc-shaped is provided with steps (32), the steps (32) are two or more than two steps, two opposite side surfaces of the square hole shaft (1) are provided with shaft pin holes (31), the shaft pin holes (31) penetrate through the square holes (30), the excircle of the shaft pin hole (31) does not exceed the central position of the square hole (30), the diameter of the shaft pin hole (31) is more than or equal to half of the side length of the square hole (30), a fixed square hole (23) matched with the square hole shaft (1) is arranged on the shifting sheet (2), pin stoppers (21) are arranged on two sides of the plectrum (2), stopper pin holes (22) are arranged on the pin stoppers (21), the upper end and the lower end of the shifting piece (2) are respectively provided with a main lock shifting foot (24) and an inclined bolt shifting foot (25).

2. The clutch device of the intelligent anti-theft lock body according to claim 1, characterized in that: the clutch pin (3) and the upper lock pin (4) are provided with snap ring grooves, and the snap ring grooves are installed in a matched mode with the snap springs (5).

3. The clutch device of the intelligent anti-theft lock body according to claim 1, characterized in that: outer square pole (7) be equipped with stalk portion (75), stalk portion (75) be square, be equipped with round bar (71) with stalk portion (75) fixed connection, the diameter of round bar (71) equals with the length of side of stalk portion (75), be equipped with round pin mouth (72) on round bar (71), the width and the degree of depth of round pin mouth (72) be greater than half of square hole (30) length of side, round bar (71) front end be equipped with connecting axle (73), it has cotter way (74) to open on connecting axle (73), protection sheet (9) are equipped with the hole, and hole diameter is unanimous with round bar (71) diameter, the maximum diagonal of terminal surface of the excircle diameter more than or equal to square hole axle (1) of protection sheet (9).

4. The clutch device of the intelligent anti-theft lock body according to claim 1, characterized in that: interior square pole (8) one end open and to have interior square pole shaft hole (81), the outside of interior square pole (8) corresponds the position with interior square pole shaft hole (81) and opens and has interior square pole pinhole (82), interior square pole pinhole (82) pass interior square pole shaft hole (81), interior square pole (8) one side open and to have shell fragment groove (83), open on shell fragment groove (83) and have rivet hole (84), shell fragment (86) dress is fixed with rivet (85) in shell fragment groove (83).

5. The clutch device of the intelligent anti-theft lock body according to claim 4, wherein: the depth and the length of the elastic sheet groove (83) are larger than the thickness and the length of the elastic sheet (86), and the rivet (85) is not higher than the side surface of the inner square rod (8) after being fixed.