CN111764751A

CN111764751A - Locking type mechanical coded lock

Info

Publication number: CN111764751A
Application number: CN202010726645.9A
Authority: CN
Inventors: 吕雪寒; 宋在勇; 齐伟
Original assignee: Beihua University
Priority date: 2020-07-25
Filing date: 2020-07-25
Publication date: 2020-10-13

Abstract

A locking type mechanical coded lock relates to the field of turntable permutation type mechanical coded locks, and completes permutation operation by directly rotating 5 knob disks; the cam mechanism is driven to rotate by the handle to realize unlocking and locking; when checking numbers, after the linkage shaft movably connected with each knob shaft passes through the lock body, the linkage shaft drives the overload protection device and the code changing device to rotate, then returns into the lock body along the same axis, sequentially drives the driving gear, the central gear and the follow-up gear to synchronously rotate, and finally drives 5 turntables with openings to rotate to the correct positions. When the lock is unlocked, the cam firstly pushes the locking plate to be inserted into the tooth groove of the central gear, each knob disc cannot rotate, then the inserting plate is pushed to be inserted into the notch of each rotating disc, the cam continues to rotate to unlock the lock, and the lock cannot be unlocked technically. When the handle or the knob disc is strongly twisted, the handle and the knob disc can idle; the password changing operation and the code disordering operation are simple and easy to implement, and the method is particularly suitable for important occasions with low use frequency.

Description

Locking type mechanical coded lock

Technical Field

The invention relates to the field of turntable permutation type mechanical coded locks, in particular to a locking type mechanical coded lock.

Background

The turntable checking type mechanical coded lock has a wide application range, is commonly used on file cabinets, vaults, safe cases, safe boxes and anti-theft doors as a mechanical blocking mechanism, but has a series of problems for a long time, namely, the time consumption of the checking process is too long, and the operation is inconvenient; secondly, the password cannot be changed, and the password is inconvenient to be hidden and stored or remembered; thirdly, the anti-theft performance cannot be technically opened, because the knob disc is directly contacted with a blocking mechanism in the lockset through the knob shaft, and the lock is easy to crack by means of hearing, hand feeling and experience; fourth, prevent that destruction performance is not too close, especially install the trick lock in the tool to lock outer panel and be equipped with the trick lock of handle, when directly destroying tool to lock outer panel or the powerful handle that twists reverse, the corresponding part of tool to lock easily suffers destruction, even destructive opening.

The rotary disc number-checking type mechanical coded lock is rarely applied to the anti-theft door because the field of the anti-theft door has high requirements on anti-theft opening and anti-damage performance, the unlocking and locking frequency of the anti-theft door is more, and the code is easy to leak during decoration.

A hole sealing type mechanical coded lock (patent number ZL 201811539519.1) well solves the series of problems: the technical unlocking can not be realized through a special structure of firstly sealing holes and then decoding unlocking; the destructiveness of preventing is opened, and when the handle was turned round to the brute force, the handle can the idle running. When the outer panel of the lock is removed or damaged, the lock still cannot be technically opened, and the exposed cam shaft still can idle; the password is adjustable, and the password changing operation is simple, easy, stable and reliable; the device is particularly suitable for occasions with low use frequency, and has the advantages of high safety factor, simple structure and low manufacturing cost.

However, the hole sealing type mechanical coded lock also has certain problems, mainly the number checking operation process is relatively complicated: when checking the numbers, the number checking operation can be finished by firstly pressing each knob disc and inserting the convex edge of the knob shaft into the butt joint groove of the knob shaft; after unlocking and locking, in order to prevent the password from being stolen, the numbers of the knob disks corresponding to the sight need to be disordered, namely, the code disordering operation process also needs to be finished by firstly pressing the knob disks and inserting the convex edges into the butt joint grooves, and certain trouble is brought to a user.

Disclosure of Invention

In order to overcome the defects of the rotating disc type combination mechanical coded lock and the hole sealing type mechanical coded lock, the invention provides a locking type mechanical coded lock, which directly and respectively rotates 5 knob discs to complete the combination operation without pressing the knob discs and still drives a cam mechanism to rotate through a handle to realize unlocking and locking; the 5 knob disks are distributed around the upper part of the handle rotating shaft, and the axle center of each knob disk is positioned on a half circumference line and is uniformly distributed; the main measures are that the number matching mechanism adopts a gear transmission mode, namely, each knob shaft respectively drives a linkage shaft in a lock body to rotate, each linkage shaft penetrates through the lock body and then is respectively assembled with an overload protection device, then each number matching wheel is respectively driven to rotate, each number matching wheel then drives a return rotating shaft sleeved on the outer circular surface of the linkage shaft to rotate, each return rotating shaft returns into the lock body and drives a driving gear to synchronously rotate, the driving gear is respectively meshed with a central gear, the central gear is respectively meshed with a follower gear, so that each rotating disc synchronously rotating with each follower gear is driven to rotate along with the rotation, each rotating disc is provided with a notch, when the lock is unlocked, a handle drives a cam mechanism to rotate, the central gear is firstly locked at the initial stage, each knob disc cannot rotate, then a plug board is inserted into the notch of each rotating disc, and the cam mechanism can continuously rotate to unlock the. The lock is driven by the multi-stage gears, and the purpose that the lock cannot be opened technically is realized by a special structure that the lock is locked and then unlocked; when the handle and the knob disc are strongly twisted, the handle and the knob disc idle, the technical opening prevention performance of the lockset is unchanged even if an outer panel of the lockset is damaged, and the exposed linkage shaft and the outer end of the circular truncated cone shaft of the cam mechanism can still idle; the password can still be changed, and the code changing operation and the code disordering operation process are simple and easy to implement.

The invention adopts the following technical scheme: a locking type mechanical coded lock comprises a lock body, a buckle cover, a lock outer panel and a handle, wherein the lock outer panel is provided with the handle, 5 knob discs which are independent from each other and 5 corresponding knob shafts, the inner side end of each knob shaft is axially provided with a square blind hole, a registration sight is arranged right above each knob disc, 10 digital scales from 0 to 9 are uniformly distributed on each knob disc and are sequenced from small to large in a clockwise direction, the lock body is in a rectangular shape, the side panel positioned on the outer side is a lock body outer panel, the side panel positioned on the inner side is a lock body inner side panel, the lower part of the inner side panel of the lock body is assembled with the buckle cover, a cavity formed by the knob disc and the buckle cover is used for assembling an unlocking execution mechanism, the unlocking and the locking are completed by driving a lock bolt and a lock tongue to run, the lower side in the lock body is provided with a cam mechanism, and the cam mechanism comprises a cam, a circular truncated cone, the lock comprises a circular table shaft, a driving shaft, collision beads and collision bead springs, wherein 4 cylindrical collision bead slideways are radially arranged on the circular table and are uniformly distributed in the circumferential direction, 1 collision bead spring and 1 collision bead are respectively movably assembled in the collision bead slideways from inside to outside, the circular table is movably assembled with an inner cavity of a cam, 4 stop through holes are formed between the inner cavity of the cam and the outer circular surface of the cam and correspond to the 4 collision bead slideways, the diameter of each stop through hole is smaller than that of the collision bead, part of each collision bead is embedded into the stop through hole in a static state, the inner side of the circular table shaft is assembled with the circular table and synchronously rotates, the middle of the circular table shaft is movably assembled with a shaft hole of an outer side plate of the lock body, the square shaft at the outer side end of the circular table shaft extends out of the outer side plate of the lock body, after the lock is arranged on a reinforcing plate at the inner side of an outer panel of a door handle, the, this square hole assembles with the square shaft of the outside end of drive shaft, the shaft hole activity of curb plate is assembled in the middle part of drive shaft and the lock body, the flat axle of side is the flat axle of drive shaft promptly in the drive shaft, the most terminal circle axle of drive shaft inboard is the drive shaft circle axle, the flat axle of drive shaft, the drive shaft circle axle all stretches out outside the curb plate in the lock body, get into the buckle closure promptly, and be connected with the actuating mechanism that unblanks, be equipped with the arc slide of 2 with the degree of depth along the circumferencial direction on the excircle face of cam inboard, and arrange along the axial of cam, the left side terminal surface of each arc slide is the flange promptly, outwards be second flange and first flange in proper order in the follow, when the cam can not rotate and the brute force is twistd reverse, the round platform, the idle rotation: the lock body is internally provided with 5 linkage shafts, 1 central shaft and 1 follow-up shaft in the direction vertical to the lock body, wherein the central shaft is positioned in the center of the upper part of the lock body, each linkage shaft is positioned on a half circumference above the central shaft by taking the axis of the central shaft as the circle center and is uniformly distributed, each linkage shaft is sequentially provided with a linkage shaft A, a linkage shaft B, a linkage shaft C, a linkage shaft D and a linkage shaft E in the clockwise direction, the included angles between the radius lines of the circumferences of the linkage shafts B and D and a vertical line are both 45 degrees, the follow-up shaft is positioned at the right lower part of the central shaft, the included angle between the radius line and a horizontal line is also 45 degrees, the outer side end of each linkage shaft is movably assembled with the shaft hole of the outer side plate of the lock body, the end head of the outermost side of the linkage shaft is a square body and extends out of the outer side plate of the lock body and is movably assembled and synchronously rotates with the square blind hole at the inner side end of the knob shaft, the outer circle surface of the return rotating shaft is movably assembled with a shaft hole of a side plate in the lock body, each return rotating shaft is sequentially provided with a return rotating shaft A, a return rotating shaft B, a return rotating shaft C, a return rotating shaft D and a return rotating shaft E in a clockwise direction, the difference between the return rotating shafts is only limited to different lengths, the outer end of each return rotating shaft in the lock body is provided with a flat shaft which is assembled with a long round hole of a driving gear and synchronously rotates, each return rotating shaft is also provided with a flat shaft after penetrating through the side plate in the lock body and assembled with the long round hole of a code wheel, the edge of the code wheel is provided with 10 code changing holes along the axial direction and evenly distributed along the circumferential direction of the code wheel, but the positions of the code changing holes of the code changing wheels relative to the central line of the length direction of the long round hole or the central line of the vertical direction are different, wherein 2 opposite code changing wheels assembled with the return rotating shafts A and the return rotating shafts E are positioned on the central line of the long round hole in the, 2 opposite code changing holes of the code changing wheel assembled with the return shaft C are positioned on the central line of the length direction of the long round hole, 2 opposite code changing holes of the code changing wheel assembled with the return shaft B are inclined by 9 degrees to the right relative to the central line of the length direction of the long round hole, 2 opposite code changing holes of the code changing wheel assembled with the return shaft D are inclined by 9 degrees to the left relative to the central line of the length direction of the long round hole, a thin shaft of each linkage shaft passes through the central through hole of the return shaft and then is movably assembled with the code changing wheel and the central through hole of the wheel cover respectively, the tail end of the thin shaft of each linkage shaft passes through the wheel cover and then is provided with a clamp spring groove and is assembled with 1 clamp spring, 1 radial gap is arranged under the central through hole of the code changing wheel, the wheel cover is in the shape of a water bucket and is buckled outside the code changing wheel from inside to outside, 1 spring and 1 steel ball are filled in a space formed by the radial gaps of the wheel cover, the code changing, the corresponding position of the inner side end of a thin shaft of a linkage shaft is provided with 1 key groove, a steel ball is embedded into one part of the key groove under the pushing of a spring in a static state, the linkage shaft drives a code-changing disc to rotate through the key groove and the steel ball when rotating, when the resistance borne by the code-changing disc exceeds a limit value, the linkage shaft idles, 1 code-changing screw hole is arranged above a central through hole of the code-changing disc, a wheel cover is provided with 1 through hole corresponding to the code-changing screw hole, 1 code-changing bolt penetrates through the through hole of the wheel cover and then is assembled with the code-changing screw hole, the outer side end of the code-changing bolt penetrates through the code-changing screw hole and then is inserted into 1 code-changing hole of the code-changing wheel, and the code-changing holes inserted into different positions represent different unlocking passwords, the two ends of a central shaft are respectively assembled with corresponding shaft holes of a lock body outer side plate and a lock body inner side, wherein, the clapboard is a round rectangle, two ends of the clapboard are respectively provided with 1 through hole, the through hole above the clapboard is movably assembled with the central shaft, each central gear is respectively engaged with the corresponding driving gear, namely the length of the middle part of the reversing shaft and the length of the thin shaft of the linkage shaft are different and are determined by the position of the corresponding central gear, two ends of the follow-up shaft are respectively assembled with the corresponding shaft holes of the outer side plate and the inner side plate of the lock body, the middle part of the follow-up shaft is movably assembled with the central through holes of 5 follow-up gears, each follow-up gear is respectively engaged with the central gear, simultaneously, the flat shaft on the side surface of each follow-up gear is respectively assembled with the long round hole of the turntable and synchronously rotates, each turntable is separated from the other adjacent follow-up gear by the clapboard, the follow-up shaft is movably assembled with the through hole below the clapboard, the edge of each turntable is provided with 1 gap, namely the opening of the turntable, a locking plate and an unlocking insertion plate are respectively arranged between the cam, the central gear and the rotary disc, wherein the locking plate is horizontally arranged, the right end of the locking plate is movably assembled with 1 rotary shaft and can swing along the rotary shaft, the left end of the locking plate is provided with a clamping strip bent upwards, the cross section of the upper end of the clamping strip is in an isosceles triangle shape, the static clamping strip is aligned to the right lower part of each central gear, the left end of the locking plate is provided with 1 locking plate bulge downwards, the static locking plate bulge is inserted into an arc-shaped slide way of the cam and is aligned to a first flange, the middle part of the locking plate is provided with a spring connecting hole and is movably connected with the upper end of a locking plate tension spring, the lower end of the locking plate tension spring is connected with the lock body, the unlocking insertion plate inclines 45 degrees leftwards relative to the horizontal line, the left lower end of the unlocking insertion plate is movably assembled with the other 1 rotary shaft, the cross section of the cutting is rectangular, the cutting is aligned to the 45-degree line direction of the right lower part of each rotary disc under the static state, the cutting plate bulge is arranged at the right lower part of the unlocking cutting plate under the static state, the cutting plate bulge is positioned in the arc-shaped slide way of the cam and aligned to the second flange, the middle part of the unlocking cutting plate is also provided with a spring connecting hole and is movably connected with the upper end of a cutting plate tension spring, the lower end of the cutting plate tension spring is connected with the lock body, the left sides of the locking plate bulge and the cutting plate bulge are both inclined planes, when the password is correct, the center of 1 tooth space of each central gear is positioned under the central gear, the center of the opening of each rotary disc is positioned on the 45-degree line of the right lower part of the rotary disc, when the lock is unlocked, each rotary knob disc rotates to the correct number position, in the process of pressing down the handle and clockwise rotation of, when the first flange is separated from the protrusion of the locking plate, the second flange starts to contact with the protrusion of the plug board, the unlocking plug board swings leftwards and upwards, the plug strip is inserted into the turntable opening of each turntable, the cam can continue to rotate, the unlocking executing mechanism is driven to operate to unlock the lockset, if the password is incorrect, at least 1 turntable opening is not positioned on the 45-degree line at the lower right of the turntable, the unlocking plug board is prevented from swinging leftwards and upwards, the cam is prevented from continuing to rotate, the lockset cannot be unlocked, if the handle and the knob disk are twisted by a strong force, the handle and the knob disk idle, and after the handle is rotated reversely, the unlocking plug board and the locking plate are reset sequentially under the action of the plug board tension spring and the locking plate tension spring respectively.

In the scheme, the linkage shaft penetrates through the outside of the lock body to be assembled with the code changing disc in the overload protection device, then the rotary motion is transmitted back into the lock body and drives the central gear to rotate, and the code changing mechanism is arranged at the innermost side of the lock body, namely the outside of the lock body, so that the code changing operation is facilitated.

In the scheme, after the numbers are matched, the actual positions of each knob disc, the central gear, the follower gear and the rotary disc always have certain deviation, but the clamping strip of the locking plate and the gear teeth on the central gear have the correction function, namely, in the process that the clamping strip is inserted into the tooth grooves on the central gear, each rotary disc can finally rotate to the position.

The function of baffle is 5 gear train mutual interferences, influence normal unblanking when preventing to check the number.

When the technology is started, the conduction conditions of the short impact of the cutting and the turntable, including the sound intensity and the vibration intensity, need to be analyzed, discriminated and judged through the hearing, the hand feeling and the experience. In addition, the contact condition is judged by the rotation resistance. If the password is incorrect, because the first flange of the cam firstly enables the central gear not to rotate during unlocking, then the slip and the rotary disc are enabled to generate contact or impact (the contact or the impact is weak generally because of small clearance), but the knob disc cannot rotate at the moment, and the connecting piece from the knob disc to the rotary disc comprises a knob shaft, a linkage shaft, a code changing disc, a code changing wheel, a rotating returning shaft, a driving gear, a central gear and a follow-up gear, and meanwhile, a central shaft and a follow-up shaft are arranged among gear sets and used as a shared connecting piece, so that the source of sound and vibration cannot be judged, the feeling cannot be found by starting from the aspect of the knob disc, namely, the lock cannot be technically opened.

The key groove, the spring and the steel ball are arranged between the tail end of the linkage shaft and the code changing disc and are used as an overload protection device to enable the linkage shaft to idle, so that the knob disc and the handle have the same anti-damage function.

According to the scheme, under the condition that the outer panel of the lockset is not arranged or is damaged, the lockset still has the performance of incapability of technical opening and destructive opening.

The operation process of code disorder: after the lock is unlocked, the handle is reset, and the knob disc can be twisted randomly.

Initial password: the initial password of the coded lock is set to be 5 and 0, so that the coded lock is easy to remember and is convenient for lock assembly.

Changing the password operation program: firstly, each knob disc is adjusted to the position of an initial password or an original password, the handle is pressed down to be unlocked, the unlocking state is kept, namely, the handle cannot be reset, and at the moment, the inserting strips are all inserted into the openings of the knob discs. And then the code-changing bolt is withdrawn from the code-changing screw hole for a certain length, the knob disc is rotated to a new code position, and the code-changing bolt is screwed again and inserted into the other code-changing hole of the code-changing wheel. And changing the passwords of other knob disks by the same method to finish the password change of the lockset.

The code changing disc, the wheel cover, the code changing wheel, the driving gear, the central gear, the rotary disc, the gasket, the partition plate, the locking plate, the unlocking plugboard and other parts can be processed and manufactured in a stamping and bending mode. The method belongs to a mould batch production process, so that the precision is high and the cost is low.

The invention selects 5 groups of number checking mechanisms, each group has 10 digital scales corresponding to the password position, so the key amount of the lockset is 5 times of 10, namely 10 ten thousand, and the actually used key amount is equal to a theoretical value-1 (initial password).

The unlocking process of the lockset needs to carry out number matching on 5 knob disks, so that the lockset is suitable for occasions with low use frequency, such as a safe and the like. Because the password is adjustable, the changed password is convenient to remember, and the trouble of hiding and keeping keys is saved.

The unlocking actuating mechanism of the lockset adopts the related technologies of a double-insertion type anti-theft door and an external hanging type locking device (patent number ZL 201610129609.8) and a gear serial key mechanical anti-theft lock (application number 202010176602.8) in the prior art. When the lockset is used for a security door, the unlocking actuator comprises an outdoor driving disk, a swing rod, a pull plate, an indoor driving disk, a right-angle rotating plate, a bolt driving disk, a lock bolt and a bolt, wherein a driving shaft flat shaft and a driving shaft round shaft are respectively assembled with the outdoor driving disk and the swing rod; when the lockset is used for a safety box, the requirement can be met only by driving the lock bolt, a lock bolt and a lock bolt driving device are not needed, indoor driving devices such as an indoor driving disc and the like are not needed, and a right-angle rotating plate is not needed to drive a top and bottom rod, so that the multipoint locking device of the safety box has the function.

The invention has the beneficial effects that: the lockset adopts a special structure of locking first and then unlocking, and has the following characteristics while realizing the technical unlocking: the number matching operation process, the messy code operation process and the password changing process are more convenient and easy to implement; the knob disc and the handle can idle, and the anti-theft opening performance is unchanged even if the knob disc and the handle damage to the outer panel of the lockset, so that the anti-theft opening performance is very strong, and the safety coefficient is high; the gear transmission is mainly used, the structure is compact and simple, the manufacturing cost is low, and the gear transmission is particularly suitable for occasions with low use frequency.

The present invention will be further described with reference to fig. 1 to 33.

Drawings

FIG. 1: the overall structure schematic diagram of the coded lock;

FIG. 2: view A-A of FIG. 1;

FIG. 3: FIG. 1 is a sectional view taken along line B-B;

FIG. 4: schematic diagrams of a linkage shaft and a reversing shaft;

FIG. 5: a code wheel schematic diagram;

FIG. 6: a transcoding verification intent;

FIG. 7: a front view of the wheel cover;

FIG. 8: the left side view of fig. 7;

FIG. 9: returning to the front view of the rotating shaft;

FIG. 10: the right side view of FIG. 9;

FIG. 11: a front view of the drive gear;

FIG. 12: FIG. 11 is a top view;

FIG. 13: a sun gear schematic;

FIG. 14: a follower gear front view;

FIG. 15: FIG. 14 is a top view;

FIG. 16: a schematic view of a turntable;

FIG. 17: a schematic view of a separator plate;

FIG. 18: the knob disc, the knob shaft and the outer panel of the lockset are assembled schematically;

FIG. 19: a knob disk schematic;

FIG. 20: a code-changing position schematic diagram;

FIG. 21: a lock plate front view;

FIG. 22: FIG. 21 is a top view;

FIG. 23: unlocking a front view of the plugboard;

FIG. 24: FIG. 23 is a top view;

FIG. 25: a front view of the cam mechanism;

FIG. 26: the left side view of FIG. 25;

FIG. 27 is a schematic view showing: a front view of the cam;

FIG. 28: the left side view of fig. 27;

FIG. 29: a circular truncated cone front view;

FIG. 30: the left side view of fig. 29;

FIG. 31: a circular truncated cone shaft schematic view;

FIG. 32: a schematic view of a drive shaft;

FIG. 33: schematic diagram of a special-shaped universal driving shaft.

In each figure: 1, a lock body, 2, a lock body outer side plate, 3, a lock body inner side plate, 4, a buckle cover, 5, a lock body outer panel, 6, a knob disc, 7, a knob shaft, 8, a cam, 9, a stop through hole, 10, an arc-shaped slideway, 11, a first flange, 12, a second flange, 13, a circular truncated cone, 14, a circular truncated cone shaft, 15, a driving shaft, 16, a driving shaft flat shaft, 17, a driving shaft circular shaft, 18, a collision ball, 19, a collision ball spring, 20, a linkage shaft, 21, a key groove, 22, a linkage shaft A, 23, a linkage shaft B, 24, a linkage shaft C, 25, a linkage shaft D, 26, a linkage shaft E, 27, a code changing wheel, 28, a code changing hole, 29, a wheel cover, 30, a code changing disc, 31, a central through hole, 32, a radial notch, 33, a code changing screw hole, 34, a code changing bolt, 35, a return shaft, 36, 37, a return shaft B, 38, a return shaft C, 39, a return shaft E, 41: a driving gear, 42: a central shaft, 43: a central gear, 44: a gasket, 45: a partition plate, 46: a follow-up shaft, 47: a follow-up gear, 48: a turntable, 49: a turntable opening, 50: a locking plate, 51: a clamping strip, 52: a locking plate bulge, 53: an unlocking insertion plate, 54: an insertion strip, 55: an insertion plate bulge, 56: a locking plate tension spring, and 57: an insertion plate tension spring.

Detailed Description

As shown in fig. 1, 2 and 3, the locking type mechanical combination lock comprises a lock body 1, a buckle cover 4, a lock outer panel 5 and a handle, wherein the handle, 5 knob disks 6 which are independent of each other and 5 corresponding knob shafts 7 are arranged on the lock outer panel 5. The lock body 1 is rectangular, the side panel that is located the outside is lock body outer panel 2, the side panel that is located the inboard is lock body inside side panel 3, the inboard lower part and the buckle closure 4 assembly of lock body inside side panel 3, the outside of the cavity that the two formed and buckle closure 4 is used for assembling the actuating mechanism that unblanks to accomplish through drive set bar, spring bolt operation and unblank and lock, the downside in the lock body 1 is equipped with cam mechanism.

As shown in fig. 25 to 32, the cam mechanism includes a cam 8, a circular truncated cone 13, a circular truncated cone shaft 14, a driving shaft 15, collision beads 18 and collision bead springs 19, wherein 4 cylindrical collision bead slideways are radially arranged on the circular truncated cone 13 and uniformly distributed in the circumferential direction, 1

collision bead spring

19 and 1 collision bead 18 are respectively movably assembled in the collision bead slideways from inside to outside, the circular truncated cone 13 is movably assembled with an inner cavity of the cam 8, 4 stop through holes 9 are arranged between the inner cavity of the cam 8 and an outer circumferential surface of the cam corresponding to the 4 collision bead slideways, the diameter of each stop through hole 9 is smaller than that of each collision bead 18, and a part of each collision bead 18 is embedded into the corresponding stop through hole 9 in a static state. The inner side end of the circular truncated cone shaft 14 is assembled with the circular truncated cone 13 and synchronously rotates, the middle of the circular truncated cone shaft 14 is movably assembled with the shaft hole of the lock body outer side plate 2, the square shaft of the outer side end of the circular truncated cone shaft 14 extends out of the lock body outer side plate 2, after the lockset is installed on the reinforcing plate on the inner side of the door leaf outer panel, the square shaft of the outer side end of the circular truncated cone shaft 14 is movably inserted into the square hole of the handle rotating shaft. The axis of the cam 8 is provided with a square hole which is fitted with a square shaft at the outer end of the drive shaft 15. As shown in fig. 2 and 3, the middle part of the driving shaft 15 is movably assembled with the shaft hole of the lock body inner side plate 3, the flat shaft at the inner side end of the driving shaft 15 is a driving shaft flat shaft 16, the round shaft at the extreme end of the inner side of the driving shaft 15 is a driving shaft round shaft 17, and the driving shaft flat shaft 16 and the driving shaft round shaft 17 both extend out of the lock body inner side plate 3, namely enter the buckle cover 4 and are connected with the unlocking execution mechanism. The outer circular surface of the inner side of the cam 8 is provided with 2 arc-shaped slideways 10 with the same depth along the circumferential direction, the arc-shaped slideways are arranged along the axial direction of the cam 8, the left end surface of each arc-shaped slideway 10 is a flange, and the left end surface is provided with a second flange 12 and a first flange 11 from inside to outside in sequence. When the cam 8 cannot rotate and the handle is strongly twisted, the circular truncated cone 13, the circular truncated cone shaft 14 and the handle idle rotate relative to the cam 8.

As shown in fig. 18 and 19, a square blind hole is axially formed at the inner end of each knob shaft 7, a registration star (not shown) is arranged right above each

knob disk

6, and 10 digital scales from 0 to 9 are uniformly distributed on each knob disk 6 and are arranged from small to large in the clockwise direction.

As shown in fig. 1, 2 and 3, 5

linkage shafts

20, 1

central shaft

42 and 1 follower shaft 46 are arranged in the lock body in a direction vertical to the lock body, wherein the central shaft 42 is located at the center of the upper portion of the lock body 1, each linkage shaft 20 is located on a half circumference above the central shaft with the axis of the central shaft as the center of circle and is uniformly distributed, each linkage shaft 20 is sequentially provided with a linkage shaft a22, a linkage shaft B23, a linkage shaft C24, a linkage shaft D25 and a linkage shaft E26 in a clockwise direction, the included angles between the circumferential radius lines of the linkage shafts B and D and the vertical line are both 45 degrees, the follower shaft 46 is located at the lower right side of the central shaft, and the included angle between the radius line of the follower shaft 46 and the horizontal line is also 45 degrees. The outer side end of each linkage shaft 20 is movably assembled with the shaft hole of the lock body outer side plate 2, and the outermost side end of each linkage shaft is a square body, extends out of the lock body outer side plate, and is movably assembled with the square blind hole at the inner side end of the knob shaft 7 and synchronously rotates.

As shown in fig. 4, the inner side end of each linkage shaft 20 is a thin shaft and is movably assembled with the central through hole 31 of each 1 of the reversing shafts 35, as shown in fig. 2 and 3, the outer circular surface of each reversing shaft 35 is movably assembled with the shaft hole of the lock body inner side plate 3, the reversing shafts assembled on each linkage shaft 20 are sequentially a reversing shaft a36, a reversing shaft B37, a reversing shaft C38, a reversing shaft D39 and a reversing shaft E40 in a clockwise direction, the difference between the reversing shafts is limited to the difference of the lengths of the middle parts, the outer side end of each reversing shaft located in the lock body is provided with a flat shaft and is assembled with the long circular hole of the driving gear 41 and rotates synchronously, and the reversing shafts are also provided with flat shafts after passing through the lock body inner side plate 3 and are assembled with the long circular holes of the code wheel 27 and rotate synchronously.

As shown in fig. 5, 10 code conversion holes 28 are provided at the edge of the code conversion wheel 27 in the axial direction and are uniformly distributed in the circumferential direction of the code conversion wheel, but the positions of the code conversion holes 28 of the code conversion wheels with respect to the center line in the longitudinal direction or the center line in the vertical direction of the oblong hole are different from each other, wherein 2 code conversion holes 28 facing each other of the code conversion wheels assembled with the return shaft a36 and the return shaft E40 are located on the center line in the vertical direction of the oblong hole, 2 code conversion holes 28 facing each other of the code conversion wheels assembled with the return shaft C38 are located on the center line in the longitudinal direction of the oblong hole, the 2 code conversion holes facing each other of the code conversion wheels assembled with the return shaft B37 are deviated 9 degrees to the right with respect to the center line in the longitudinal direction of the oblong hole, and the 2 code conversion holes facing each other of the code conversion wheels assembled with the return shaft D39 are deviated 9 degrees to the left with respect to the center line in the longitudinal direction.

As shown in fig. 2 and 3, the thin shaft at the inner side end of each linkage shaft passes through the central through hole of the return rotating shaft 35 and then is movably assembled with the code changing disc 30 and the central through hole 31 of the wheel cover 29, and the tail end of the thin shaft of each linkage shaft 20 passes through the wheel cover 29 and then is provided with a clamp spring groove and is assembled with 1 clamp spring. As shown in fig. 6, 1 radial gap 32 is provided right below the central through hole 31 of the code-changing disc 30. The wheel cover 29 is in the shape of a bucket and is buckled outside the code changing disc from inside to outside, 1 spring and 1 steel ball are arranged in a space formed by the wheel cover 29, the code changing wheel 27 and a radial opening 32 of the code changing disc 30, as shown in figure 4, 1 key groove 21 is arranged at a position corresponding to a thin shaft of the linkage shaft 20, the steel ball is embedded into one part of the key groove 21 under the pushing of the spring in a static state, the code changing disc 30 is driven to rotate through the key groove 21 and the steel ball when the linkage shaft 20 rotates, and when the resistance borne by the code changing disc 30 exceeds a limit value, the linkage shaft 20 idles. 1 code-changing screw hole 33 is arranged right above the central through hole 31 of the code-changing disc 30, 1 through hole is arranged on the wheel cover 29 corresponding to the code-changing screw hole, 1 code-changing bolt 34 passes through the through hole of the wheel cover 29 and then is assembled with the code-changing screw hole 33, the outer end of the code-changing bolt 34 passes through the code-changing screw hole 33 and then is inserted into 1 code-changing hole 28 of the code-changing wheel 27, and the code-changing holes inserted into different positions represent different unlocking codes. The both ends of center pin 42 respectively with lock body outside plate 2, the lock body inside plate 3 correspond the shaft hole assembly, 5 sun gear 43 of mid portion movable assembly of center pin, assemble 1

packing ring

44 and 1 baffle 45 on the center pin 42 between each sun gear, wherein, baffle 45 is the fillet rectangle, its both ends respectively are equipped with 1 through-hole, the through-hole of its top and center pin 42 movable assembly.

As shown in fig. 1, 2 and 3, each central gear 43 is engaged with a corresponding driving gear 47, that is, the length of the middle part of the reversing shaft 35 and the length of the thin shaft of the linkage shaft 20 are different from each other and determined by the axial position of the corresponding central gear 43. Two ends of a follow-up shaft 46 are respectively assembled with corresponding shaft holes of the lock body outer side plate 2 and the lock body inner side plate 3, the middle part of the follow-up shaft is movably assembled with a central through hole 31 of 5 follow-up gears 47, each follow-up gear is respectively meshed with the central gear 43, meanwhile, a flat shaft on the side surface of each follow-up gear 47 is respectively assembled with a long circular hole of a turntable 48 and synchronously rotates, each turntable 48 is separated from another adjacent set of follow-up gears 47 through a partition plate 45, and the follow-up shaft is movably assembled with the through hole below the partition plate. 1 gap, namely a turntable opening 49 is arranged below the long round hole of each turntable 48 and is positioned on the central line of the turntable long round hole in the vertical direction.

As shown in fig. 1 and 2, a locking plate 50 and an unlocking insertion plate 53 are respectively arranged between the cam 8 and the central gear 43 and between the cam 8 and the rotary disk 48, as shown in fig. 1, 21 and 22, the locking plate 50 is horizontally arranged, the right end of the locking plate 50 is movably assembled with 1 rotating shaft and can swing along the rotating shaft, the left end of the locking plate 50 is provided with a clamping strip 51 which is bent upwards, the cross section of the upper end of the clamping strip is an isosceles triangle, and the clamping strip 51 is aligned to be right below each central gear 43 in a static state. The left end of lock plate is equipped with 1 lock plate arch 52 downwards, and lock plate arch inserts in the arc slide 10 of cam 8 under static state to aim at first flange 11, and the middle part of lock plate 50 is equipped with spring coupling hole to with the upper end swing joint of lock plate extension spring 56, the lower extreme and the lock body 1 of lock plate extension spring are connected.

As shown in fig. 1, 23 and 24, the unlocking insertion plate 53 is inclined 45 degrees leftwards relative to the horizontal line, the left lower end of the unlocking insertion plate is movably assembled with the other 1 rotating shaft and can swing along the rotating shaft, the right end of the unlocking insertion plate 53 is provided with a cutting strip 54 which is vertically bent leftwards and upwards, the cross section of the cutting strip is rectangular, the cutting strip 54 is aligned with the 45-degree line direction of the right lower part of each rotating disc 48 under the static state, an insertion plate bulge 55 is arranged rightwards under the right end of the unlocking insertion plate 53, the insertion plate bulge is positioned in the arc-shaped slide way 10 of the cam 8 and aligned with the second flange 12 under the static state, the middle part of the unlocking insertion plate 53 is also provided with a spring connecting hole and is movably connected with the. The left sides of the locking plate protrusion 52 and the inserting plate protrusion 55 are both inclined planes, when the password is correct, the centers of 1 tooth groove of each central gear 43 are both positioned right below the central gear, and the centers of the turntable openings 49 are both positioned on a 45-degree line at the right lower side of the turntable.

As shown in fig. 2 and 3, the thick shaft of the linkage shaft 20 functions to limit the axial displacement of the linkage shaft in the lock body 1. In 5 linkage shafts, a driving gear 41 assembled on a return rotating shaft on 1 of the linkage shafts is meshed with a central gear 43 on the outermost side, and according to the arrangement mode shown in fig. 4, the length of a thick shaft of the linkage shaft is theoretically 0, and the solution has two types:

firstly, the outermost central gear 43 and the washer 44 in contact with the outermost central gear are interchanged, the corresponding follower gear 47 and the turntable 48 are also interchanged, and the thick shaft length of the linkage shaft is the same as the thickness of the washer 44 (as shown in the linkage shaft 22 in fig. 4);

secondly, the position of each central gear 43 is kept unchanged, the structure of the linkage shaft is changed, for example, the special-shaped linkage shaft shown in fig. 33 is formed by changing the assembly part of the original linkage shaft and the corresponding shaft hole of the lock body outer side plate 2 into a thick shaft, and the thick shaft and the clamp spring at the inner side tail end of the special-shaped linkage shaft limit the axial movement of the special-shaped linkage shaft.

As shown in fig. 1, in the present embodiment, the center of 1 of the rack grooves is first set directly below the stationary lower sun gear 43, so that the lock bar 51 of the lock plate 50 is inserted thereinto. All gear module are the same, wherein, drive gear 41, follower gear 47 are 10 teeth of a cogwheel, and then the corresponding circular arc angle of 1 tooth of a cogwheel is 36 degrees, and simultaneously, the gear characteristics of 10 teeth of a cogwheel are: when the vertical line corresponds to the centers of the two tooth tops, the horizontal line corresponds to the centers of the two tooth sockets, and otherwise, when the vertical line corresponds to the centers of the two tooth sockets, the horizontal line corresponds to the centers of the two tooth tops. The central gear 43 is provided with 32 gear teeth, and the division of 4 by 32 is equal to an even number 8, so that the corresponding positions of the diameter lines of the central gear 43 at the upper, lower, left, right, left 45-degree angles and right 45-degree angles are the centers of the tooth grooves. The above arrangement results in an assembly result as shown in fig. 5:

2 opposite code changing holes 28 of the code changing wheel 27 assembled on the rotating shaft C38 are positioned on the central line of the long circular hole length direction of the code changing wheel;

2 opposite code changing holes 28 of the code changing wheel 27 assembled by the reversing shaft A36 and the reversing shaft E40 are positioned on the central line of the long round hole of the code changing wheel in the vertical direction;

2 opposite code changing holes 28 of the code changing wheel 27 assembled on the rotating shaft B37 are inclined by 9 degrees to the right relative to the central line of the long round hole in the length direction;

the 2 opposite code changing holes 28 of the code changing wheel 27 assembled on the rotating shaft D39 are inclined 9 degrees leftwards relative to the central line of the long round hole in the length direction.

According to the above arrangement, after the lock is assembled, if the initial code is 50, the scale "0" of the dial in the static state is aligned with the sight on the dial, and as shown in fig. 20, the code-changing bolt 34 on the central through hole 31 of the code-changing dial 30 is aligned with the scale "0" on the periphery of the wheel cover 29.

Unlocking process and working principle: when the lock is unlocked, each knob disc 6 rotates to a correct number position, and in the process of pressing down the knob and clockwise rotating the cam mechanism, the first flange 11 of the cam 8 firstly contacts with the protrusion 52 of the locking plate, so that the locking plate 50 is pushed to swing upwards, the clamping strips 51 of the locking plate are inserted into 1 tooth groove of each central gear 43, and all the gears cannot rotate any more. When the first flange 11 is separated from the contact with the locking plate protrusion 52, the second flange 12 starts to contact with the inserting plate protrusion 55, and the unlocking inserting plate 53 swings to the left and the upper, so that the inserting strip 54 is inserted into the rotating plate opening 49 of each rotating plate 48, the cam 8 can continue to rotate, and the unlocking actuating mechanism is driven to operate to unlock the lock. If the password is incorrect, at least 1 turntable opening 49 is not positioned on the 45-degree line at the lower right of the turntable 48, the unlocking inserting plate 53 is prevented from swinging upwards leftwards, further, the cam 8 is prevented from continuing to rotate, and the lockset cannot be unlocked. If the handle or the knob disk 6 is twisted strongly, the handle and the knob disk 6 are idle. After the handle is rotated reversely, the unlocking insertion plate 53 and the locking plate 50 are reset in sequence under the action of the insertion plate tension spring 57 and the locking plate tension spring 56 respectively.

The operation process of code disorder: after the lock is unlocked, the handle is reset, and the knob disc 6 can be twisted randomly.

Changing the password operation program: as shown in fig. 18, 19 and 20, each knob disk 6 is adjusted to the position of the initial password or the original password, the handle is pressed down to unlock, the unlocking state is kept, namely, the handle cannot be reset, and the inserts 54 are inserted into the turntable openings 49 at the moment. The code changing bolt 34 is withdrawn from the code changing screw hole 33 for a certain length, the knob tray 6 is turned to a new code position, and the code changing bolt 34 is screwed again and inserted into another code changing hole 28 of the code changing wheel 27. And changing the passwords of other knob disks 6 by the same method to finish the password change of the lockset.

Claims

1. A locking type mechanical coded lock comprises a lock body, a buckle cover, a lock outer panel and a handle, wherein the lock outer panel is provided with the handle, 5 knob discs which are independent from each other and 5 corresponding knob shafts, the inner side end of each knob shaft is axially provided with a square blind hole, a registration sight is arranged right above each knob disc, 10 digital scales from 0 to 9 are uniformly distributed on each knob disc and are sequenced from small to large in a clockwise direction, the lock body is in a rectangular shape, the side panel positioned on the outer side is a lock body outer panel, the side panel positioned on the inner side is a lock body inner side panel, the lower part of the inner side panel of the lock body is assembled with the buckle cover, a cavity formed by the knob disc and the lock cover is used for assembling an unlocking execution mechanism, the unlocking and the locking are completed by driving a lock bolt and a lock tongue to run, the lower side in the lock body is provided with a cam mechanism, and the cam mechanism comprises a cam, The lock comprises a circular table, a circular table shaft, a driving shaft, collision beads and collision bead springs, wherein 4 cylindrical collision bead slideways are arranged on the circular table along the radial direction and are uniformly distributed along the circumferential direction, 1 collision bead spring and 1 collision bead are respectively movably assembled in the collision bead slideways from inside to outside, the circular table is movably assembled with an inner cavity of a cam, 4 stop through holes are formed between the inner cavity of the cam and the outer circular surface of the cam and correspond to the 4 collision bead slideways, the diameter of each stop through hole is smaller than that of the collision bead, part of each collision bead is embedded into the stop through hole under a static state, the inner side end of the circular table shaft is assembled with the circular table and synchronously rotates, the middle part of the circular table shaft is movably assembled with a shaft hole of a lock body outer side plate, the square shaft at the outer side end of the circular table shaft extends out of the lock body outer side plate, a lock is arranged on a reinforcing plate at the inner side of a door leaf outer panel, the, this square hole assembles with the square shaft of the outside end of drive shaft, the shaft hole activity of curb plate is assembled in the middle part of drive shaft and the lock body, the flat axle of side is the flat axle of drive shaft promptly in the drive shaft, the most terminal circle axle of drive shaft inboard is the drive shaft circle axle, the flat axle of drive shaft, the drive shaft circle axle all stretches out outside the curb plate in the lock body, get into the buckle closure promptly, and be connected with the actuating mechanism that unblanks, be equipped with the arc slide of 2 with the degree of depth along the circumferencial direction on the excircle face of cam inboard, and arrange along the axial of cam, the left side terminal surface of each arc slide is the flange promptly, outwards be second flange and first flange in proper order in the follow, when the cam can not rotate and the brute force is twistd reverse, the round platform, the idle rotation: the lock body is internally provided with 5 linkage shafts, 1 central shaft and 1 follow-up shaft in the direction vertical to the lock body, wherein the central shaft is positioned in the center of the upper part of the lock body, each linkage shaft is positioned on a half circumference above the central shaft by taking the axis of the central shaft as the circle center and is uniformly distributed, each linkage shaft is sequentially provided with a linkage shaft A, a linkage shaft B, a linkage shaft C, a linkage shaft D and a linkage shaft E in the clockwise direction, the included angles between the radius lines of the circumferences of the linkage shafts B and D and a vertical line are both 45 degrees, the follow-up shaft is positioned at the right lower part of the central shaft, the included angle between the radius line and a horizontal line is also 45 degrees, the outer side end of each linkage shaft is movably assembled with the shaft hole of the outer side plate of the lock body, the end head of the outermost side of the linkage shaft is a square body and extends out of the outer side plate of the lock body and is movably assembled and synchronously rotates with the square blind hole at the inner side end of the knob shaft, the outer circle surface of the return rotating shaft is movably assembled with a shaft hole of a side plate in the lock body, each return rotating shaft is sequentially provided with a return rotating shaft A, a return rotating shaft B, a return rotating shaft C, a return rotating shaft D and a return rotating shaft E in a clockwise direction, the difference between the return rotating shafts is only limited to different lengths, the outer end of each return rotating shaft in the lock body is provided with a flat shaft which is assembled with a long round hole of a driving gear and synchronously rotates, each return rotating shaft is also provided with a flat shaft after penetrating through the side plate in the lock body and assembled with the long round hole of a code wheel, the edge of the code wheel is provided with 10 code changing holes along the axial direction and evenly distributed along the circumferential direction of the code wheel, but the positions of the code changing holes of the code changing wheels relative to the central line of the length direction of the long round hole or the central line of the vertical direction are different, wherein 2 opposite code changing wheels assembled with the return rotating shafts A and the return rotating shafts E are positioned on the central line of the long round hole in the, 2 opposite code changing holes of the code changing wheel assembled with the return shaft C are positioned on the central line of the length direction of the long round hole, 2 opposite code changing holes of the code changing wheel assembled with the return shaft B are inclined by 9 degrees to the right relative to the central line of the length direction of the long round hole, 2 opposite code changing holes of the code changing wheel assembled with the return shaft D are inclined by 9 degrees to the left relative to the central line of the length direction of the long round hole, a thin shaft of each linkage shaft passes through the central through hole of the return shaft and then is movably assembled with the code changing wheel and the central through hole of the wheel cover respectively, the tail end of the thin shaft of each linkage shaft passes through the wheel cover and then is provided with a clamp spring groove and is assembled with 1 clamp spring, 1 radial gap is arranged under the central through hole of the code changing wheel, the wheel cover is in the shape of a water bucket and is buckled outside the code changing wheel from inside to outside, 1 spring and 1 steel ball are filled in a space formed by the radial gaps of the wheel cover, the code changing, the corresponding position of the inner side end of a thin shaft of a linkage shaft is provided with 1 key groove, a steel ball is embedded into one part of the key groove under the pushing of a spring in a static state, the linkage shaft drives a code-changing disc to rotate through the key groove and the steel ball when rotating, when the resistance borne by the code-changing disc exceeds a limit value, the linkage shaft idles, 1 code-changing screw hole is arranged above a central through hole of the code-changing disc, a wheel cover is provided with 1 through hole corresponding to the code-changing screw hole, 1 code-changing bolt penetrates through the through hole of the wheel cover and then is assembled with the code-changing screw hole, the outer side end of the code-changing bolt penetrates through the code-changing screw hole and then is inserted into 1 code-changing hole of the code-changing wheel, and the code-changing holes inserted into different positions represent different unlocking passwords, the two ends of a central shaft are respectively assembled with corresponding shaft holes of a lock body outer side plate and a lock body inner side, wherein, the clapboard is a round rectangle, two ends of the clapboard are respectively provided with 1 through hole, the through hole above the clapboard is movably assembled with the central shaft, each central gear is respectively engaged with the corresponding driving gear, namely the length of the middle part of the reversing shaft and the length of the thin shaft of the linkage shaft are different and are determined by the position of the corresponding central gear, two ends of the follow-up shaft are respectively assembled with the corresponding shaft holes of the outer side plate and the inner side plate of the lock body, the middle part of the follow-up shaft is movably assembled with the central through holes of 5 follow-up gears, each follow-up gear is respectively engaged with the central gear, simultaneously, the flat shaft on the side surface of each follow-up gear is respectively assembled with the long round hole of the turntable and synchronously rotates, each turntable is separated from the other adjacent follow-up gear by the clapboard, the follow-up shaft is movably assembled with the through hole below the clapboard, the edge of each turntable is provided with 1 gap, namely the opening of the turntable, a locking plate and an unlocking insertion plate are respectively arranged between the cam, the central gear and the rotary disc, wherein the locking plate is horizontally arranged, the right end of the locking plate is movably assembled with 1 rotary shaft and can swing along the rotary shaft, the left end of the locking plate is provided with a clamping strip bent upwards, the cross section of the upper end of the clamping strip is in an isosceles triangle shape, the static clamping strip is aligned to the right lower part of each central gear, the left end of the locking plate is provided with 1 locking plate bulge downwards, the static locking plate bulge is inserted into an arc-shaped slide way of the cam and is aligned to a first flange, the middle part of the locking plate is provided with a spring connecting hole and is movably connected with the upper end of a locking plate tension spring, the lower end of the locking plate tension spring is connected with the lock body, the unlocking insertion plate inclines 45 degrees leftwards relative to the horizontal line, the left lower end of the unlocking insertion plate is movably assembled with the other 1 rotary shaft, the cross section of the cutting is rectangular, the cutting is aligned to the 45-degree line direction of the right lower part of each rotary disc under the static state, the cutting plate bulge is arranged at the right lower part of the unlocking cutting plate under the static state, the cutting plate bulge is positioned in the arc-shaped slide way of the cam and aligned to the second flange, the middle part of the unlocking cutting plate is also provided with a spring connecting hole and is movably connected with the upper end of a cutting plate tension spring, the lower end of the cutting plate tension spring is connected with the lock body, the left sides of the locking plate bulge and the cutting plate bulge are both inclined planes, when the password is correct, the center of 1 tooth space of each central gear is positioned under the central gear, the center of the opening of each rotary disc is positioned on the 45-degree line of the right lower part of the rotary disc, when the lock is unlocked, each rotary knob disc rotates to the correct number position, in the process of pressing down the handle and clockwise rotation of, when the first flange is separated from the protrusion of the locking plate, the second flange starts to contact with the protrusion of the plug board, the unlocking plug board swings leftwards and upwards, the plug strip is inserted into the turntable opening of each turntable, the cam can continue to rotate, the unlocking executing mechanism is driven to operate to unlock the lockset, if the password is incorrect, at least 1 turntable opening is not positioned on the 45-degree line at the lower right of the turntable, the unlocking plug board is prevented from swinging leftwards and upwards, the cam is prevented from continuing to rotate, the lockset cannot be unlocked, if the handle and the knob disk are twisted by a strong force, the handle and the knob disk idle, and after the handle is rotated reversely, the unlocking plug board and the locking plate are reset sequentially under the action of the plug board tension spring and the locking plate tension spring respectively.