A lock body structure and a changeable key structure

Abstract

This utility model relates to the field of security equipment and discloses a lock body structure and a changeable key structure. The lock body structure includes: a lock shell structure forming a lock cylinder cavity, an unlocking cavity, and an unlocking hole; a lock cylinder forming at least two sliding grooves, with undulating guide surfaces within the grooves, each guide surface having one unlocking point and several decoy points; a release annular groove forming around the unlocking point; and an unlocking arm equipped with pins. When all pins move to the unlocking point, the lock cylinder rotates to unlock; when some pins move to the unlocking point and some pins move to the decoy points, the lock cylinder undergoes a decoy rotation. Unlocking is achieved only when the unlocking arm moves to the unlocking point, and the decoy rotation of the lock cylinder when it moves to the decoy points increases the difficulty of unlocking. By changing and adjusting the key pin array, different key pin arrays can be combined to open multiple lock bodies. This utility model not only increases the security and reliability of the lock body but also improves the compatibility of the key and reduces the difficulty of key management.

Description

Technical Field

[0001] This utility model relates to the field of security equipment technology, and mainly to a combination lock structure with a pin structure. The combination lock can be opened by combining unlocking pins of a set length. Specifically, a lock body structure and a changeable key structure are disclosed. Background Technology

[0002] Locks are widely used in daily life and work, and they come in various structural forms. Based on unlocking methods, the most common types are electronic locks and mechanical locks. Electronic locks, also known as smart locks, automatically unlock by recognizing unlocking features such as fingerprints or facial recognition. However, electronic locks suffer from a problem with battery life; they require a power supply to operate normally. Power outages affect their functionality, increasing the burden on users. Furthermore, electronic locks are vulnerable to technical hacking; if their control system is compromised via network technology, they can be unlocked. While electronic locks offer convenience, they do not reduce security risks. Mechanical locks, as a traditional lock structure, use mechanical mechanisms for locking and unlocking, requiring no separate function; they can be unlocked using a corresponding key. However, the drawback of mechanical locks is that each lock requires a unique key. When managing multiple locks, multiple keys also need to be managed, again increasing the burden on users. As for mechanical combination locks, they generally achieve keyless locking and unlocking through mechanical dialing, eliminating the problem of mechanical locks requiring keys to unlock. Users do not need to manage a large number of keys. However, the problem with mechanical combination locks is that the unlocking method is simple, and the unlocking password can be obtained through a limited number of attempts, which does not meet the security requirements of users.

[0003] It is evident that both current electronic and mechanical locks have significant shortcomings and room for improvement. Mechanical locks, in particular, need optimization to address the issue of managing a large number of keys and the low security of mechanical combination locks. This would allow for simpler and more convenient management of numerous locks, more flexible and flexible opening, and prevent hacking over long-term use, thus ensuring security and reliability. Therefore, a more reasonable technical solution is needed to address the existing technical problems. Utility Model Content

[0004] To address some of the problems existing in the prior art, this utility model discloses a lock body structure and a changeable key structure. By improving the lock cylinder structure, the lock body can be unlocked only by using a set of pins with matching lengths. When using pins of incompatible lengths for unlocking, the lock cylinder structure will perform a confusing action of rotating according to the command but failing to unlock, making it impossible for the unlocker to determine the correct unlocking pin set through trial and error, thereby greatly improving the security and reliability of the lock body.

[0005] To achieve the above objectives, the lock body structure disclosed in this utility model can adopt the following solution: A lock body structure, comprising: The lock housing structure includes an outer lock housing and an inner lock housing. The outer lock housing has a lock cylinder cavity inside, and an unlocking cavity is formed between the outer lock housing and the inner lock housing. Several unlocking holes are also formed on the outer lock housing. The lock cylinder is rotatably mounted in the lock cylinder cavity. The upper part of the lock cylinder is the driving part, and the lower part of the lock cylinder is the locking part. At least two grooves extending along the lock cylinder axis are formed on the side surface of the locking part. An undulating guide surface is formed in the groove. One guide surface is flush with the side wall of the locking part to form an unlocking point. At the same time, several guide surfaces are flush with the side wall of the locking part to form decoy points. The unlocking points and decoy points formed by the multiple guide surfaces are spaced apart axially. A disengagement annular groove connecting to other grooves is formed on the circumference of the unlocking point on the side wall of the locking part. The unlocking arm is located in the unlocking cavity. There are more than one unlocking arm, which are spaced apart around the circumference. The unlocking arm is equipped with a pin and is located in a groove to circumferentially limit the locking part. The unlocking arm is pushed by the drive block and slides along the groove. When all the pins move to the unlocking point, all the pins slide relative to the locking part on the circumference to realize the lock cylinder rotation unlocking. When some pins move to the unlocking point and some pins move to the decoy point, the lock cylinder rotates a certain angle and the pins fall into the adjacent groove and are circumferentially limited, and the lock cylinder locks.

[0006] The lock body structure disclosed above uses a drive block to move the unlocking arm, causing the pin to move along the guide surface within the slide groove. When the pin reaches the unlocking point, its circumferential movement restriction is released. Therefore, when all pins reach the unlocking point simultaneously, the lock cylinder can rotate, which is the only way to unlock. In actual use, because the axial distance between each unlocking point and the unlocking hole is different, the distance each unlocking arm moves is also different. Therefore, when the pin of one unlocking arm reaches the unlocking point, the pins of other unlocking arms are still in the slide groove or at the decoy point. When a pin is in the slide groove, the circumferential movement restriction is not released, and the entire lock cylinder cannot rotate. When the pin is at the unlocking point and the decoy point, the lock cylinder can rotate a certain angle until the pin moving along the decoy point gets stuck in the next adjacent slide groove, and the circumferential movement is restricted again. At this time, the unlocking angle of the correct unlocking method will deflect once, and the unlocking angle needs to be adjusted accordingly to achieve correct unlocking again. According to the lock body structure disclosed in this application, not only is the difficulty of unlocking increased, but the deceptiveness of unlocking is also increased, making it impossible for others to obtain the correct unlocking method through a limited number of attempts, thereby improving the security of the lock body.

[0007] Furthermore, the unlocking hole is used to accommodate the key. The corresponding part of the key is inserted into the unlocking hole, coordinating with the lock cylinder and the unlocking arm to achieve unlocking. This can be configured in various ways; here, we optimize and propose one feasible option: the unlocking hole includes a key bar hole and a key pin hole. The key bar hole is aligned with the drive unit, and the key pin holes are evenly distributed circumferentially outside the key bar hole and connect to the unlocking cavity. Each key pin hole aligns with a set of drive blocks and the unlocking arm. In this scheme, both the key bar hole and the key pin hole are round holes, and each key pin hole corresponds one-to-one with a drive block and the unlocking arm, with at least two key pin holes.

[0008] Furthermore, when setting the drive block, its reciprocating sliding within the unlocking cavity needs to be considered. It can slide to the set unlocking position or return to the initial position. This can be achieved through various schemes, and its structure is not limited to a single one. Here, we optimize and propose one feasible option: a directional post is provided in the unlocking cavity, and the drive block cooperates with the directional post and slides along the directional post. Under normal conditions, the drive block is located in the initial position and slides when pushed by the key pin. A pin surface is formed on the drive block to cooperate with the key pin, and it also cooperates with the unlocking cavity through a directional structure. An elastic reset member is provided on the directional post, and the drive block is subjected to the elastic reset force applied by the elastic reset member and returns to the initial position. When the above scheme is adopted, the directional post is fixedly set in the directional hole, which is located in the unlocking cavity between the outer lock shell and the inner lock shell, and can be set in the inner top and inner bottom of the unlocking cavity; the driving block is slidably sleeved on the directional post; the reset elastic element includes a spring, which is compressed under normal conditions and provides elastic force. The elastic force acts on the driving block and makes it located at the first end of the directional post, i.e., the initial position. When the driving block is pushed by the key pin, it slides along the directional post, thereby driving the unlocking action arm to move together. When all the pins reach the unlocking point, the lock can be unlocked.

[0009] Furthermore, the directional structure is used to maintain the stability of the drive block during movement, ensuring contact and engagement with the drive block each time the key pin enters the key pin hole. Its structure is not uniquely limited; optimization is proposed here, and one feasible option is suggested: the directional structure includes a directional groove and a directional protrusion. The directional groove is disposed within the unlocking cavity, and the directional protrusion is disposed on the drive block; or the directional groove is disposed on the drive block, and the directional protrusion is disposed within the unlocking cavity. When adopting the above scheme, the directional groove can be a square groove or an arc-shaped groove, and the directional protrusion can be a corresponding square protrusion or an arc-shaped protrusion.

[0010] Furthermore, when the outer lock shell is connected to the lock cylinder, it cooperates with the driving part and locking part of the lock cylinder respectively. Its structure is not uniquely limited. Here, we optimize and propose one feasible option: The outer lock shell includes a first shell part and a second shell part. The unlocking cavity includes a first cavity located in the first shell part and used to accommodate the driving part, and a second cavity located in the second shell part and used to accommodate the locking part. The pin on the unlocking arm enters the second cavity through a through groove in the second shell part and cooperates with a sliding groove. The unlocking arm presses the pin into the sliding groove and makes it fit against the guide surface. When the above scheme is adopted, a gap is formed between the driving part and the first cavity to cooperate with the inserted key bar. The locking part fits against the inner wall surface of the second cavity to achieve relative rotation. The through groove penetrates the inner and outer surfaces of the second shell part, so that the pin on the outer unlocking arm can pass through the through groove and cooperate with the sliding groove.

[0011] In some designs, the unlocking arm is a flexible component that undergoes flexible deformation when it is pushed against the guide surface, ensuring that the pin remains in contact with the guide surface. Alternatively, the unlocking arm may be equipped with a deflecting elastic component that provides elastic force to the unlocking arm. When pushed against the guide surface, the arm deflects, ensuring that the pin remains in contact with the guide surface.

[0012] In some designs, to improve the smoothness of the pin's movement within the groove, the end of the pin is made into an arc surface, and the edge of the groove opening is also provided with an arc-shaped chamfer, thus facilitating the pin's movement along the groove and its entry into and exit from the groove. However, considering the stability of the fit between the pin and the groove surface, and to prevent the counterforce between the groove wall and the pin from causing the unlocking arm to spring back and mis-lock operation due to the resistance force when the lock cylinder rotates, a flat surface is provided on the pin to conform to the groove wall, thereby ensuring the stable and reliable fit between the pin and the groove wall.

[0013] Furthermore, to ensure the restoring force of the drive block and its smooth return to the initial position after unlocking, in addition to the elastic reset component providing the restoring force, a structure providing the restoring force can be added. This structure is not limited to a single one; here, we propose one feasible option: a reset traction assembly is also provided within the unlocking cavity. This reset traction assembly includes several winding drums, each containing an elastic component providing the restoring force. A traction cable is wound around the winding drum, and the drive block is connected to the front end of the traction cable and resets towards its initial position. With this solution, the reset traction component can be configured one-to-one with the drive block, and the reset is achieved through the restoring force provided by the winding drum.

[0014] Furthermore, the drive unit or the first cavity is provided with an anti-rebound structure. The anti-rebound structure includes an annular groove on the inner wall of the first cavity, and several outer longitudinal grooves communicating with the annular groove on the inner wall of the first cavity; or, the anti-rebound structure includes a circumferential anti-reverse groove on the drive unit, and several inner longitudinal grooves communicating with the circumferential anti-reverse groove on the drive unit. The anti-rebound structure is used to cooperate with the key. When the key is engaged with the lock body, the key bar enters the key bar hole and is sleeved on the drive unit. After the key bar rotates circumferentially, it cooperates with the anti-rebound structure and prevents it from retracting and disengaging from the key bar hole under the action of elastic force. When the above scheme is adopted, the annular groove is 360°, and the circumferential groove only needs to form a transverse groove segment on the circumference to hold the key bar.

[0015] Meanwhile, the outer and inner longitudinal grooves need to be spaced out circumferentially, with the same number as the sliding grooves. This is to account for the engagement angle between the key and the lock cylinder. When the lock cylinder undergoes a deceptive rotation, the correct unlocking angle shifts, causing the engagement angle between the key and the lock cylinder to shift accordingly. The anti-rebound structure must function at all angles, requiring multiple outer or inner longitudinal grooves to ensure correct key insertion. However, the presence of multiple outer or inner longitudinal grooves also reduces the indication of correct unlocking, increasing the deceptive nature of the unlocking process.

[0016] When using an external longitudinal groove design, the drive part of the lock cylinder can be any cylindrical or conical shape other than a cylinder or cone. When using an internal longitudinal groove design, the drive part of the lock cylinder can only be cylindrical or conical; otherwise, the internal anti-reverse block cannot enter the circumferential anti-reverse groove.

[0017] The above content discloses the lock body structure, and this utility model also discloses the corresponding key structure.

[0018] A convertible key structure, paired with the lock body structure described above, includes a key bar that corresponds to the drive unit. A key disc and a key cylinder are coaxially rotatably mounted on the key bar. Key needles are spaced out along the circumference of the key cylinder and correspond one-to-one with key needle holes. A key needle seat is provided on the key cylinder and the key needles are connected by threads. The length of the key needles entering the key needle holes is adjusted by the key needle seat. The key needle seat also flips and engages with the key cylinder, causing the key needles to flip to fit the side surfaces of the key cylinder and the key disc. The side surfaces of the key cylinder and the key disc correspond to form needle grooves to accommodate the key needles.

[0019] The aforementioned interchangeable key structure connects the key bar to the drive unit, applying a circumferential rotational force to the drive unit. The key pin, inserted into the key pin hole, engages with the drive block, causing the drive block to move. In this configuration, the key pin array for unlocking can be changed by adjusting the key pin length; unlocking is only achieved when the correct array is inserted into the unlocking hole. After use, the key pin holder flips to retract the key pin into the pin groove, thus storing the key pin.

[0020] Furthermore, when the pin reaches the unlocking point and the deceptive point, causing the lock cylinder to rotate deceptively, the lock cylinder will not automatically return to its initial position. The key pin array needs to rotate through the corresponding angle to achieve engagement. This can be achieved through various methods. Here, we optimize and propose one feasible option: A circumferential limiting component is provided between the key disc and the key cylinder. The circumferential limiting component includes a limiting groove set along the circumference and a corresponding elastic pin. The elastic pin enters the limiting groove to maintain the circumferential engagement position of the key disc and the key cylinder. The key bar is connected to a key handle, and a key pin is provided on the key handle. When the key pin is inserted into the pin groove of the key disc, the key handle drives the key disc to rotate synchronously and adjust the engagement angle with the key cylinder in the circumferential direction. When the key pin exits the pin groove, the key handle and the key disc rotate relative to each other, and the key disc and the key cylinder maintain a fixed circumferential engagement. When using the above solution, the elastic pin has a round head structure, and the limiting groove is an arc-shaped groove. When the elastic pin is engaged in the limiting groove, it achieves circumferential limiting of the key cylinder and the key disc. When a circumferential torsional force is applied to the key disc and the key cylinder, the elastic pin rebounds under force, achieving relative rotation between the key disc and the key cylinder. After rotating through a set angle, the elastic pin engages in the next limiting groove to re-limit the key disc and the key cylinder. The number of limiting grooves is equal to the number of key pin holes and unlocking arms, and they are arranged one-to-one on the circumference.

[0021] In some designs, the key cylinder has a key pin position mark, and correspondingly, the lock cylinder drive unit also has a lock cylinder position mark. To unlock, the key pin is aligned with the lock cylinder position mark before being inserted into the key pin hole. If the lock cylinder undergoes a deceptive rotation, the lock cylinder position mark deflects; subsequent unlocking simply requires aligning the key pin with the lock cylinder position mark.

[0022] In some designs, a spring-loaded pin can be used instead of a key pin. The key handle and key disc are spring-loaded and locked together. Each key handle and key disc has a spring-loaded pin and a corresponding pin hole. The spring-loaded pin engages with the pin hole. When the key handle rotates, the resulting pressure forces the spring-loaded pin out of the pin hole, allowing relative rotation between the key handle and key disc. After the key handle has rotated a specific angle (e.g., one full turn), it will re-enter the pin hole corresponding to the spring-loaded pin. This design makes it easy to determine the relative rotation angle of the key handle, facilitating unlocking operations.

[0023] Furthermore, after the key is inserted into the unlocking hole, the key bar engages with the drive unit, and the key pin engages with the drive block. To unlock, the drive block needs to be pushed a certain distance before the key handle is turned to rotate the lock cylinder and unlock. This involves applying circumferential and axial forces to the key, and both forces need to be maintained to unlock smoothly, which increases the difficulty of operation. To address this, the engagement structure between the key and the lock body can be adjusted to avoid applying forces in both directions simultaneously. The structure is not limited to a single one. Here, we propose one feasible option: the key bar has a key bar hole corresponding to the drive unit, and a backstop block that engages with the anti-rebound structure. The backstop block includes an outer backstop block that engages with the outer longitudinal groove and the annular groove, or an inner backstop block that engages with the inner longitudinal groove and the circumferential backstop groove. When the above scheme is adopted, the length of the key bar is set to correspond with the length of the key bar hole and the drive unit. The number and height of the outer anti-reverse blocks on the key bar are set to correspond with the number and height of the annular grooves in the key bar hole. Similarly, the number and height of the inner anti-reverse blocks on the key bar are set to correspond with the number and height of the circumferential anti-reverse grooves on the key bar.

[0024] In some solutions, by configuring the number and height of the external anti-reverse blocks, only lock bodies with corresponding ring groove numbers and heights can be opened. When the number and height of the ring grooves do not match, the key cannot unlock, thus increasing the restrictions on unlocking and the compatibility between lock bodies and keys, reducing the interoperability between different keys. Similarly, by configuring the number and height of the internal anti-reverse blocks, only lock bodies with corresponding corresponding circumferential anti-reverse groove numbers and heights can be opened. When the number and height of the circumferential anti-reverse grooves do not match, the key cannot unlock, again increasing the restrictions on unlocking, the compatibility between lock bodies and keys, and reducing the interoperability between different keys.

[0025] Compared with the prior art, some of the beneficial effects of the technical solution disclosed in this utility model include: By improving the lock body structure, unlocking is achieved only when the unlocking arm moves to the unlocking point. When the arm moves to the deceptive point, the lock cylinder rotates in a misleading manner, increasing the difficulty of unlocking and preventing the lock body from being broken through by trial and error. Simultaneously, the variable key structure allows for the adjustment and variation of the key pin array, enabling the opening of multiple lock bodies by combining different key pin arrays. This invention not only increases the security and reliability of the lock body but also improves key compatibility and reduces the difficulty of key management. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the internal cross-sectional structure of the lock body (the keyhole is equipped with an outer longitudinal groove and an annular groove).

[0028] Figure 2 This is a schematic diagram of the internal cross-sectional structure of the lock body (the drive section is equipped with an inner longitudinal groove and a circumferential anti-reverse groove).

[0029] Figure 3 This is a schematic diagram of the arrangement of the unlocking holes on the lock body (four key pin holes, with an outer longitudinal groove in the key bar hole).

[0030] Figure 4 This is a schematic diagram of the arrangement of the unlocking holes on the lock body (eight key pin holes, with an outer longitudinal groove in the key bar hole).

[0031] Figure 5 This is a schematic diagram of the arrangement of the unlocking holes on the lock body (four keyholes, with an inner longitudinal groove in the drive section).

[0032] Figure 6 This is a schematic diagram of the arrangement of the unlocking holes on the lock body (six keyholes, with an inner longitudinal groove in the drive section).

[0033] Figure 7 This is a top view of the lock cylinder structure (with four sliding grooves).

[0034] Figure 8 This is a schematic diagram of the overall structure of the lock cylinder (showing the first and second slides).

[0035] Figure 9 This is a schematic diagram of the overall structure of the lock cylinder (showing the second and fourth slides).

[0036] Figure 10 This is a schematic diagram of the overall structure of the lock cylinder (showing the third slide and the first slide).

[0037] Figure 11 This is a schematic diagram of the overall structure of the lock cylinder (showing the fourth and third slides).

[0038] Figure 12 This is a schematic diagram of the key structure (the length of the key pin has been adjusted, an external anti-reverse block is set, and the key pin leaves the pin groove).

[0039] Figure 13This is a schematic diagram of the key structure (the length of the key pin has been adjusted, an external anti-reverse block is set, and the key pin is inserted into the pin groove).

[0040] Figure 14 This is a schematic diagram of the key structure (the key pin is retracted into the pin groove, an internal anti-reverse block is set, and the key pin leaves the pin groove).

[0041] Figure 15 This is a schematic diagram of the key structure (a spring-loaded pin is used on the key handle instead of a key pin).

[0042] Figure 16 This is a structural diagram of the pin head.

[0043] In the above attached figures, the meanings of each label are as follows: 1. Outer lock housing; 101. First housing section; 102. Second housing section; 103. Through groove; 104. Key bar hole; 105. Key pin hole; 2. Inner locking case; 3. Lock cylinder; 301. Drive unit; 302. Locking unit; 303. Slide groove; 3031. First slide groove; 3032. Second slide groove; 3033. Third slide groove; 3034. Fourth slide groove; 304. Guide surface; 3041. First guide surface; 3042. Second guide surface; 3043. Third guide surface; 3044. Fourth guide surface; 305. Unlocking point; 3051. First unlocking point; 3052. Second unlocking point; 3053. Third unlocking point; 3054. Fourth unlocking point; 306. Deception point; 3061. First deception point; 3064. Fourth deception point; 307. Disengagement ring groove; 3071. First disengagement ring groove; 3072. Second disengagement ring groove; 3073. Third disengagement ring groove; 3074. Fourth disengagement ring groove; 4. Unlocking cavity; 5. Lock cylinder cavity; 6. Drive block; 7. Reset traction assembly; 8. Unlocking arm; 801. Pin head; 802. Plane; 9. Directional post; 10. Elastic reset component; 11. Outer longitudinal groove; 12. Ring groove; 13. Inner longitudinal groove; 14. Circumferential anti-reverse groove; 15. Key handle; 1501. Key handle hole; 1502. Key pin; 16. Key bar; 1601. Key bar mating hole; 1602. Outer anti-reverse block; 1603. Inner anti-reverse block; 17. Key disc; 1701. Pin groove; 1702. Elastic pin; 18. Key cylinder; 19. Key pin seat; 20. Key pin. Detailed Implementation

[0044] The following description, in conjunction with the accompanying drawings and specific embodiments, further illustrates this embodiment.

[0045] The existing mechanical locks are not secure or reliable enough, and one key can only open one lock. Managing multiple locks requires managing a large number of keys, leading to cumbersome management. The following embodiments optimize and overcome the shortcomings of the existing technology.

[0046] Example 1 like Figure 1 , Figure 2 As shown, this embodiment provides a lock body structure designed to improve the security and reliability of the lock body. By increasing the difficulty of unlocking conditions and setting deceptive actions, the correct unlocking method is obtained through trial and error.

[0047] The lock body structure disclosed in this embodiment uses a drive block 6 to push the unlocking arm 8 to move, causing the pin head 801 to move along the guide surface 304 within the slide groove 303. When the pin head 801 reaches the unlocking point 305, its circumferential movement restriction is released. Therefore, when all the pin heads 801 reach the unlocking point 305 simultaneously, the lock cylinder 3 can be rotated, which is the only way to achieve unlocking. In actual use, because the axial distance between each unlocking point 305 and the unlocking hole is different, the distance that each unlocking arm 8 moves is also different. Therefore, when the pin 801 of one unlocking arm 8 reaches the unlocking point 305, the pins 801 of other unlocking arms 8 are still located in the slide groove 303 or at the deception point 306. When a pin 801 is located in the slide groove 303, the circumferential movement restriction is not released, and the entire lock cylinder 3 cannot rotate. When the pin 801 is located at the unlocking point 305 and the deception point 306, the lock cylinder 3 can rotate a certain angle until the pin 801 moving along the deception point 306 gets stuck in the next adjacent slide groove 303, and the circumferential movement is restricted again. At this time, the unlocking angle of the correct unlocking method will be deflected once, and the unlocking angle needs to be adjusted accordingly to achieve correct unlocking again. According to the lock body structure disclosed in this application, not only is the difficulty of unlocking increased, but the deceptiveness of unlocking is also increased, making it impossible for others to obtain the correct unlocking method through a limited number of attempts, thereby improving the security of the lock body.

[0048] In practical use, a lock box can be connected to the back of the lock body. Rotating the lock cylinder 3 can drive the structural components inside the lock box to move. When applied to structures such as doors and windows, this enables the opening and closing of doors and windows. The lock box structure is a mature technology in the industry, and its internal structure already has very mature technology. It is not an improvement point of this utility model. Those skilled in the art can select a suitable lock box to cooperate with the lock body of this embodiment as needed, and will not be described in detail here.

[0049] like Figure 1 , Figure 2 As shown, one of the structures of the lock body structure disclosed in this embodiment includes: The lock housing structure includes an outer lock housing 1 and an inner lock housing 2. A lock cylinder cavity 5 is formed inside the outer lock housing 1, and an unlocking cavity 4 is formed between the outer lock housing 1 and the inner lock housing 2. Several unlocking holes are also formed on the outer lock housing 1.

[0050] The unlocking hole is used to accommodate a key. The corresponding part of the key is inserted into the unlocking hole, coordinating with the lock cylinder 3 and the unlocking arm 8 to unlock the lock. This can be configured in various ways; this embodiment optimizes and uses one feasible option: such as... Figures 3-6 As shown, the unlocking hole includes a key bar hole 104 and a key pin hole 105. The key bar hole 104 is aligned with the drive unit 301. The key pin holes 105 are evenly arranged circumferentially on the outside of the key bar hole 104 and connect to the unlocking cavity 4. Each key pin hole 105 is aligned with a set of drive blocks 6 and unlocking arms 8. When adopting the above scheme, both the key bar hole 104 and the key pin hole 105 are round holes, and the key pin holes 105 correspond one-to-one with the drive blocks 6 and the unlocking arms 8, with a minimum number of two.

[0051] When the outer lock shell 1 is connected to the lock cylinder 3, it cooperates with the driving part 301 and the locking part 302 of the lock cylinder 3 respectively. Its structure is not limited to one. This embodiment optimizes and adopts one feasible option: the outer lock shell 1 includes a first shell part 101 and a second shell part 102. The unlocking cavity 4 includes a first cavity located in the first shell part 101 and used to accommodate the driving part 301, and a second cavity located in the second shell part 102 and used to accommodate the locking part 302. The pin 801 on the unlocking action arm 8 enters the second cavity through the through groove 103 of the second shell part 102 and cooperates with the slide groove 303. The unlocking action arm 8 presses the pin 801 into the slide groove 303 and fits against the guide surface 304. When the above scheme is adopted, a gap is formed between the driving part 301 and the first cavity to cooperate with the inserted key bar 16; the locking part 302 fits against the inner wall surface of the second cavity to achieve relative rotation; the through groove 103 penetrates the inner and outer surfaces of the second shell part 102, so that the pin 801 on the external unlocking arm 8 can pass through the through groove 103 and cooperate with the slide groove 303.

[0052] like Figures 7-11 As shown, the second structure of the lock body disclosed in this embodiment includes: The lock cylinder 3 is rotatably disposed in the lock cylinder cavity 5. The upper part of the lock cylinder 3 is the driving part 301, and the lower part of the lock cylinder 3 is the locking part 302. At least two grooves 303 extending axially along the lock cylinder 3 are formed on the side surface of the locking part 302. An undulating guide surface 304 is formed in the groove 303. One guide surface 304 is flush with the side wall of the locking part 302 to form an unlocking point 305. At the same time, several guide surfaces 304 are flush with the side wall of the locking part 302 to form deception points 306. The unlocking points 305 and deception points 306 formed by the multiple guide surfaces 304 are spaced apart axially. A disengagement annular groove 307 connecting to other grooves 303 is formed on the circumference of the unlocking point 305 on the side wall of the locking part 302.

[0053] In this embodiment, the grooves 303 are evenly spaced along the circumference of the locking part 302.

[0054] In this embodiment, the guide surface 304 is an arc-shaped surface, and the disengagement groove 307 can directly penetrate the adjacent slide groove 303; or it can extend from the bottom of the slide groove 303 to the surface of the locking part 302. When this is set up, the pin head 801 makes a collision sound when it enters the adjacent slide groove 303, which is the same as the collision sound of the pin head 801 moving circumferentially from the deception point 306 into the slide groove 303. This can increase the deception of unlocking, thereby increasing the difficulty of cracking the unlock.

[0055] In this embodiment, the locking part 302 of the lock cylinder 3 is provided with four sliding grooves 303, including a first sliding groove 3031, a second sliding groove 3032, a third sliding groove 3033 and a fourth sliding groove 3034.

[0056] like Figure 8 As shown, a first guide surface 3041 is formed in the first slide groove 3031. A first unlocking point 3051 and a first deception point 3061 are formed on the first guide surface 3041. A first disengagement ring groove 3071 is formed on the circumference of the locking part 302 at positions 90°, 180° and 270° away from the first unlocking point 3051. The first disengagement ring groove 3071 corresponds to the first unlocking point 3051, so that the pin head 801, which slides along the circumference from the first unlocking point 3051, can continue to move one revolution along the first disengagement ring groove 3071.

[0057] like Figure 9 As shown, a second guide surface 3042 is formed in the second slide groove 3032, and a second unlocking point 3052 is formed on the second guide surface 3042. A second disengagement ring groove 3072 is formed on the circumference of the locking part 302 at positions 90°, 180° and 270° away from the second unlocking point 3052. The second disengagement ring groove 3072 corresponds to the second unlocking point 3052, so that the pin head 801 that slides along the circumference from the second unlocking point 3052 can continue to move one revolution along the second disengagement ring groove 3072.

[0058] like Figure 10 As shown, a third guide surface 3043 is formed in the third slide groove 3033, and a third unlocking point 3053 is formed on the third guide surface 3043. A third disengagement ring groove 3073 is formed on the circumference of the locking part 302 at positions 90°, 180° and 270° away from the third unlocking point 3053. The third disengagement ring groove 3073 corresponds to the third unlocking point 3053, so that the pin head 801, which slides along the circumference from the third unlocking point 3053, can continue to move one revolution along the third disengagement ring groove 3073.

[0059] like Figure 11As shown, a fourth guide surface 3044 is formed in the fourth slide groove 3034. A fourth unlocking point 3054 and a fourth deception point 3064 are formed on the fourth guide surface 3044. A fourth disengagement ring groove 3074 is formed on the circumference of the locking part 302 at positions 90°, 180° and 270° away from the fourth unlocking point 3054. The fourth disengagement ring groove 3074 corresponds to the fourth unlocking point 3054, so that the pin head 801, which slides along the circumference from the fourth unlocking point 3054, can continue to move one revolution along the fourth disengagement ring groove 3074.

[0060] In some other embodiments, the position of the unlocking point 305 can be adjusted, and the number of deception points 306 can also be set as needed.

[0061] like Figure 1 , Figure 2 As shown, the lock body structure disclosed in this embodiment includes, in its third aspect, the following: The unlocking arm 8 is located in the unlocking cavity 4. The number of unlocking arms 8 is greater than one and they are arranged at intervals along the circumference. The unlocking arm 8 is provided with a pin 801 and is located in the slide groove 303 to circumferentially limit the locking part 302. The unlocking arm 8 is pushed by the drive block 6 and slides along the slide groove 303. When all the pins 801 move to the unlocking point 305, all the pins 801 slide relative to the locking part 302 on the circumference to realize the rotation of the lock cylinder 3 to unlock. When some of the pins 801 move to the unlocking point 305 and some of the pins 801 move to the deception point 306, the lock cylinder 3 rotates a certain angle and the pins 801 fall into the adjacent slide groove 303 and are circumferentially limited, and the lock cylinder 3 is locked.

[0062] When setting the drive block 6, its reciprocating sliding within the unlocking cavity 4 needs to be considered. It can slide to the set unlocking position or return to the initial position. This can be achieved through various schemes, and its structure is not limited to a single one. This embodiment optimizes and adopts one feasible option: the unlocking cavity 4 is provided with a directional post 9, and the drive block 6 cooperates with the directional post 9 and slides along the directional post 9. Under normal conditions, the drive block 6 is located in the initial position and slides when pushed by the key pin 20. The drive block 6 has a pin surface formed on it to cooperate with the key pin 20, and it also cooperates with the unlocking cavity 4 through a directional structure. The directional post 9 is provided with an elastic reset member 10, and the drive block 6 is subjected to the elastic reset force applied by the elastic reset member 10 and returns to the initial position. When the above scheme is adopted, the directional post 9 is fixedly installed in the directional hole between the outer lock shell 1 and the inner lock shell 2. The directional hole is located in the unlocking cavity between the outer lock shell 1 and the inner lock shell 2, and can be set in the inner top and inner bottom of the unlocking cavity; the driving block 6 is slidably sleeved on the directional post 9; the reset elastic element includes a spring, which is compressed under normal conditions and provides elastic force. The elastic force acts on the driving block 6 and makes it located at the first end of the directional post 9, i.e., the initial position. When the driving block 6 is pushed by the key pin 20, it slides along the directional post 9, thereby driving the unlocking action arm 8 to move together. When all the pins 801 reach the unlocking point 305, the lock can be unlocked.

[0063] The directional structure is used to maintain the stability of the drive block 6 during movement, ensuring that the key pin 20 can contact and engage with the drive block 6 each time it enters the key pin hole 105. Its structure is not uniquely limited; this embodiment optimizes and adopts one feasible option: the directional structure includes a directional groove and a directional protrusion. The directional groove is disposed within the unlocking cavity 4, and the directional protrusion is disposed on the drive block 6; or the directional groove is disposed on the drive block 6, and the directional protrusion is disposed within the unlocking cavity 4. When adopting the above scheme, the directional groove can be a square groove or an arc-shaped groove, and the directional protrusion can be a square protrusion or an arc-shaped protrusion.

[0064] In some designs, the unlocking arm 8 is a flexible component. When it comes into contact with the guide surface 304, it undergoes flexible deformation due to the push from the guide surface 304, ensuring that the pin 801 remains in contact with the guide surface 304. Alternatively, the unlocking arm 8 may be equipped with a deflection elastic component, which provides elastic force to the unlocking arm 8. When it is pushed by the guide surface 304, it deflects, ensuring that the pin 801 remains in contact with the guide surface 304.

[0065] like Figure 16As shown, in some solutions, to improve the smoothness of the movement of the pin 801 within the slide groove 303, the end of the pin 801 is set as an arc-shaped curved surface or a spherical surface, and the edge of the slide groove 303 is also provided with an arc-shaped chamfer, thereby facilitating the movement of the pin 801 along the slide groove 303 and from the slide groove 303 into the release ring groove 307. However, considering the stability of the fit between the pin 801 and the slide groove surface, and to avoid the pushing force between the slide groove wall and the pin 801 during lock cylinder rotation causing the unlocking arm 8 to spring back and mis-lock operation, a flat surface 802 is provided on the pin 801 to fit against the slide groove wall, thereby ensuring the stable and reliable fit between the pin 801 and the slide groove wall.

[0066] Preferably, in this embodiment, the end of the pin 801 is set to a flat head shape. The flat head 801 can fit tightly against the inner wall of the slide groove, thereby avoiding the resistance generated when the lock cylinder rotates, which causes the unlocking action arm to undergo elastic deformation and cause the pin 801 to disengage from the slide groove. Therefore, it can be ensured that the pin 801 moves along the slide groove and can only leave the slide groove from the unlocking point, and move circumferentially along the disengagement annular groove of the locking part.

[0067] To ensure the restoring force of the drive block 6 and its smooth return to its initial position after unlocking, in addition to the elastic reset member 10 providing the restoring force, a structure providing the restoring force can be added. This structure is not limited to a single one; this embodiment optimizes the process and adopts one feasible option: a reset traction assembly 7 is also provided within the unlocking cavity 4. The reset traction assembly 7 includes several winding drums, each containing an elastic member providing the restoring force. A traction cable is wound around the winding drum, and the drive block 6 is connected to the front end of the traction cable and resets towards its initial position. With this solution, the reset traction member can be configured one-to-one with the drive block 6, and the reset is achieved through the restoring force provided by the winding drum.

[0068] The drive unit 301 or the first cavity is provided with an anti-rebound structure. The anti-rebound structure includes an annular groove 12 disposed on the inner wall of the first cavity, and a plurality of outer longitudinal grooves 11 communicating with the annular groove 12 are disposed on the inner wall of the first cavity; or, the anti-rebound structure includes a circumferential anti-reverse groove 14 disposed on the drive unit 301, and a plurality of inner longitudinal grooves 13 communicating with the circumferential anti-reverse groove 14 are disposed on the drive unit 301. The anti-rebound structure is used to cooperate with the key. When the key is engaged with the lock body, the key bar 16 enters the key bar hole 104 and is sleeved on the drive unit 301. After the key bar 16 rotates circumferentially, it cooperates with the anti-rebound structure and prevents it from retracting and disengaging from the key bar hole 104 under the action of elastic force. When the above scheme is adopted, the annular groove 12 is 360°, and the circumferential groove only needs to form a transverse groove segment on the circumference to hold the key bar 16.

[0069] Meanwhile, the outer longitudinal grooves 11 and inner longitudinal grooves 13 need to be spaced out circumferentially, and the number should be the same as the number of sliding grooves 303. This is to take into account the engagement angle between the key and the lock cylinder 3. When the lock cylinder 3 undergoes a deceptive rotation, the correct unlocking angle shifts, and therefore the engagement angle between the key and the lock cylinder 3 shifts accordingly. The anti-rebound structure must be able to work at all angles, which means that multiple outer longitudinal grooves 11 or inner longitudinal grooves 13 are needed to achieve correct key insertion. At the same time, the setting of multiple outer longitudinal grooves 11 or inner longitudinal grooves 13 also reduces the prompts for correct unlocking and increases the deceptiveness of unlocking.

[0070] When the outer longitudinal groove 11 is used, the driving part 301 of the lock cylinder 3 can be any cylinder or cone other than a cylinder or cone. When the inner longitudinal groove 13 is used, the driving part 301 of the lock cylinder 3 can only be cylindrical or conical; otherwise, the inner anti-reverse block cannot enter the circumferential anti-reverse groove 14.

[0071] Example 2 The above embodiment 1 discloses a lock body structure, and this embodiment discloses a corresponding key structure.

[0072] like Figure 12 , Figure 13 and Figure 14 As shown, a convertible key structure is paired with the lock body structure described above. It includes a key bar 16 that corresponds to the drive unit 301. A key disc 17 and a key cylinder 18 are coaxially rotatably mounted on the key bar 16. Key needles 20 are spaced around the key cylinder 18 and correspond one-to-one with key needle holes 105. A key needle seat 19 is provided on the key cylinder 18 and the key needles 20 are connected by threads. The length of the key needles 20 entering the key needle holes 105 is adjusted by the key needle seat 19. The key needle seat 19 also flips and engages with the key cylinder 18 and drives the key needles 20 to flip to fit the side surfaces of the key cylinder 18 and the key disc 17. The side surfaces of the key cylinder 18 and the key disc 17 are respectively formed with needle grooves 1701 to accommodate the key needles 20.

[0073] The interchangeable key structure disclosed in this embodiment is connected and engaged with the drive unit 301 via the key bar 16, which can apply a circumferential rotational force to the drive unit 301. The key pin 20 enters the key pin hole 105 and engages with the drive block 6, which can drive the drive block 6 to move. In this engagement configuration, the length of the key pin 20 can be adjusted to change the array of key pins 20 for unlocking. Unlocking can only be achieved when the correct array is placed in the unlocking hole. After use, the key pin seat 19 is flipped to move the key pin 20 into the pin groove 1701 for storage.

[0074] When the pin 801 reaches the unlocking point 305 and the deception point 306, causing the lock cylinder 3 to rotate deceptively, the lock cylinder 3 will not automatically return to its initial position. The key pin array 20 needs to rotate through the corresponding angle before it can engage. This can be achieved through various methods; this embodiment optimizes and adopts one feasible option: a circumferential limiting component is provided between the key disc 17 and the key cylinder 18. The circumferential limiting component includes a limiting groove arranged along the circumference and a corresponding elastic pin 1702. Pin 1702 enters the limiting groove to maintain the circumferential engagement position of the key disc 17 and the key cylinder 18; the key bar 16 is connected to the key handle 15, and the key handle 15 is provided with a key pin 1502. When the key pin 1502 is inserted into the needle groove 1701 of the key disc 17, the key handle 15 drives the key disc 17 to rotate synchronously and adjusts the circumferential engagement angle with the key cylinder 18. When the key pin 1502 is removed from the needle groove 1701, the key handle 15 and the key disc 17 rotate relative to each other, and the key disc 17 and the key cylinder 18 maintain a circumferential engagement and fixation. When the above scheme is adopted, the elastic pin 1702 has a round head structure and the limiting groove is an arc-shaped groove. When the elastic pin 1702 is engaged in the limiting groove, the key cylinder 18 and the key disc 17 are circumferentially limited. When a circumferential torsional force is applied to the key disc 17 and the key cylinder 18, the elastic pin 1702 rebounds under force and realizes the relative rotation of the key disc 17 and the key cylinder 18. After rotating through a set angle, the elastic pin 1702 engages in the next limiting groove to re-limit the key disc 17 and the key cylinder 18. The number of limiting grooves is equal to the number of key pin holes 105 and unlocking action arms 8, and they are arranged one-to-one on the circumference.

[0075] Preferably, a key handle hole 1501 is formed on the key handle 15, and the key pin 1502 is disposed in the key handle hole 1501.

[0076] like Figure 15 As shown, in some solutions, a spring-loaded pin can be used instead of the key pin 1502. That is, the key handle 15 and the key disc 17 are elastically locked together by the spring-loaded pin. The key handle 15 and the key disc 17 are respectively provided with a spring-loaded pin and a pin hole. The spring-loaded pin is inserted into the pin hole. When the key handle 15 rotates, the squeezing and pushing force provided can cause the spring-loaded pin to disengage from the pin hole, thereby achieving relative rotation between the key handle 15 and the key disc 17. After the key handle 15 has rotated through a specific angle (e.g., one full turn), it will fall back into the pin hole corresponding to the spring-loaded pin. This design makes it easy to determine the relative rotation angle of the key handle 15, facilitating the unlocking operation.

[0077] In some designs, the key cylinder 18 has a key pin 20 position mark, and correspondingly, the drive unit 301 of the lock cylinder 3 also has a lock cylinder 3 position mark. When unlocking, the key pin 20 position mark is aligned with the lock cylinder 3 position mark, and then the key pin 20 is inserted into the key pin hole 105 to unlock. When the lock cylinder 3 undergoes a deceptive rotation, the lock cylinder 3 position mark deflects; subsequent unlocking only requires aligning the key pin 20 position mark with the lock cylinder 3 position mark.

[0078] After the key is inserted into the unlocking hole, the key bar 16 engages with the drive unit 301, and the key pin 20 engages with the drive block 6. To unlock, the drive block 6 needs to be pushed a certain distance before the key handle 15 is turned to rotate the lock cylinder 3 and unlock. This involves applying force to the key in both the circumferential and axial directions, and both directions need to be maintained to unlock smoothly, which increases the difficulty of operation. Therefore, the engagement structure between the key and the lock body can be adjusted to avoid applying force in both directions at the same time. The structure is not limited to one specific one. This embodiment optimizes and adopts one feasible option: the key bar 16 forms a key bar engagement hole 1601 corresponding to the drive unit 301, and also forms a backstop block that engages with the anti-rebound structure. The backstop block includes an outer backstop block 1602 that engages with the outer longitudinal groove 11 and the annular groove 12, or an inner backstop block 1603 that engages with the inner longitudinal groove 13 and the circumferential backstop groove 14. When the above scheme is adopted, the length of the key bar 16 is set in accordance with the length of the key bar mating hole 1601 and the drive part 301. The number and height of the outer anti-reverse blocks 1602 on the key bar 16 are set in accordance with the number and height of the annular grooves 12 in the key bar mating hole 1601. Similarly, the number and height of the inner anti-reverse blocks 1603 on the key bar 16 are set in accordance with the number and height of the circumferential anti-reverse grooves 14 on the key bar 16.

[0079] In some solutions, by configuring the number and height of the outer anti-reverse blocks 1602, only lock bodies with corresponding numbers and heights of the ring grooves 12 can be opened. When the number and height of the ring grooves 12 are not configured correctly, the key cannot unlock, thus increasing the restrictions on unlocking and the compatibility between the lock body and the key, while reducing the interoperability between different keys. Similarly, by configuring the number and height of the inner anti-reverse blocks 1603, only lock bodies with corresponding numbers and heights of the circumferential anti-reverse grooves 14 can be opened. When the number and height of the circumferential anti-reverse grooves 14 are not configured correctly, the key cannot unlock, again increasing the restrictions on unlocking, the compatibility between the lock body and the key, and reducing the interoperability between different keys.

[0080] The above are the embodiments listed in this example; however, this example is not limited to the optional embodiments described above; those skilled in the art can arbitrarily combine the above methods to obtain other various embodiments; anyone can derive other various forms of embodiments under the guidance of this example. The above specific embodiments should not be construed as limiting the scope of protection of this example; the scope of protection of this example should be determined by the claims.

Claims

1. A lock body structure, characterized in that, include: The lock housing structure includes an outer lock housing and an inner lock housing. The outer lock housing has a lock cylinder cavity inside, and an unlocking cavity is formed between the outer lock housing and the inner lock housing. Several unlocking holes are also formed on the outer lock housing. The lock cylinder is rotatably mounted in the lock cylinder cavity. The upper part of the lock cylinder is the driving part, and the lower part of the lock cylinder is the locking part. At least two grooves extending along the lock cylinder axis are formed on the side surface of the locking part. An undulating guide surface is formed in the groove. One guide surface is flush with the side wall of the locking part to form an unlocking point. At the same time, several guide surfaces are flush with the side wall of the locking part to form decoy points. The unlocking points and decoy points formed by the multiple guide surfaces are spaced apart axially. A disengagement annular groove connecting to other grooves is formed on the circumference of the unlocking point on the side wall of the locking part. The unlocking arm is located in the unlocking cavity. There are more than one unlocking arm, which are spaced apart around the circumference. The unlocking arm is equipped with a pin and is located in a groove to circumferentially limit the locking part. The unlocking arm is pushed by the drive block and slides along the groove. When all the pins move to the unlocking point, all the pins slide relative to the locking part on the circumference to realize the lock cylinder rotation unlocking. When some pins move to the unlocking point and some pins move to the decoy point, the lock cylinder rotates a certain angle and the pins fall into the adjacent groove and are circumferentially limited, and the lock cylinder locks.

2. The lock body structure according to claim 1, characterized in that: The unlocking hole includes a key bar hole (104) and a key pin hole (105). The key bar hole (104) is aligned with the drive unit (301). The key pin holes (105) are evenly arranged around the outside of the key bar hole (104) and connect to the unlocking cavity (4). Each key pin hole (105) is aligned with a set of drive blocks (6) and unlocking action arms (8).

3. The lock body structure according to claim 1 or 2, characterized in that: The unlocking cavity (4) is provided with a directional post (9), and the driving block (6) cooperates with the directional post (9) and slides along the directional post (9). Under normal conditions, the driving block (6) is located in the initial position and slides when pushed by the key pin (20). A pin surface is formed on the driving block (6) to cooperate with the key pin (20), and it also cooperates with the unlocking cavity (4) through a directional structure. An elastic reset member (10) is provided on the directional post (9), and the driving block (6) is subjected to the elastic reset force applied by the elastic reset member (10) and resets to the initial position.

4. The lock body structure according to claim 3, characterized in that: The orientation structure includes an orientation groove and an orientation protrusion. The orientation groove is disposed in the unlocking cavity (4), and the orientation protrusion is disposed on the driving block (6); or the orientation groove is disposed on the driving block (6), and the orientation protrusion is disposed in the unlocking cavity (4).

5. The lock body structure according to claim 3, characterized in that: The outer lock shell (1) includes a first shell part (101) and a second shell part (102). The unlocking cavity (4) includes a first cavity located in the first shell part (101) and used to accommodate the drive part (301), and a second cavity located in the second shell part (102) and used to accommodate the locking part (302). The pin (801) on the unlocking arm (8) enters the second cavity through the through groove (103) of the second shell part (102) and cooperates with the slide groove (303). The unlocking arm (8) presses the pin (801) into the slide groove (303) and fits against the guide surface (304).

6. The lock body structure according to claim 1, characterized in that: The unlocking cavity (4) is also provided with a reset traction assembly (7), which includes several winding cylinders and elastic elements that provide restoring force inside the winding cylinders; a traction cable is wound on the winding cylinders, and the drive block (6) is connected to the front end of the traction cable and resets towards the initial position.

7. The lock body structure according to claim 5, characterized in that: The drive unit (301) or the first cavity is provided with an anti-rebound structure. The anti-rebound structure includes an annular groove (12) provided on the inner wall of the first cavity, and a plurality of outer longitudinal grooves (11) connected to the annular groove (12) are provided on the inner wall of the first cavity; or, the anti-rebound structure includes a circumferential anti-rebound groove (14) provided on the drive unit (301), and a plurality of inner longitudinal grooves (13) connected to the circumferential anti-rebound groove (14) are provided on the drive unit (301). The anti-rebound structure is used to cooperate with the key. When the key is engaged with the lock body, the key bar (16) of the key enters the key bar hole (104) and is sleeved on the drive unit (301). After the key bar (16) rotates circumferentially, it cooperates with the anti-rebound structure and avoids retraction and disengagement from the key bar hole (104) under the action of elastic force.

8. A changeable key structure, paired with the lock body structure of claims 1 to 7, characterized in that: The device includes a key bar (16) that corresponds to and cooperates with the drive unit (301). A key plate (17) and a key cylinder (18) are coaxially rotatably mounted on the key bar (16). Key needles (20) are arranged at intervals along the circumference on the key cylinder (18) and correspond one-to-one with key needle holes (105). A key needle seat (19) is provided on the key cylinder (18) and the key needles (20) are connected by threads. The length of the key needles (20) entering the key needle holes (105) is adjusted by the key needle seat (19). The key needle seat (19) also flips and cooperates with the key cylinder (18) and drives the key needles (20) to flip to fit the side surfaces of the key cylinder (18) and the key plate (17). The side surfaces of the key cylinder (18) and the key plate (17) are respectively formed with needle grooves (1701) to accommodate the key needles (20).

9. The interchangeable key structure according to claim 8, characterized in that: A circumferential limiting component is provided between the key plate (17) and the key cylinder (18). The circumferential limiting component includes a limiting groove provided along the circumference and a corresponding elastic pin (1702). The elastic pin (1702) enters the limiting groove to maintain the circumferential engagement position of the key plate (17) and the key cylinder (18). The key bar (16) is connected to a key handle (15). A key pin (1502) is provided on the key handle (15). When the key pin (1502) is inserted into the needle groove (1701) of the key plate (17), the key handle (15) drives the key plate (17) to rotate synchronously and adjust the engagement angle with the key cylinder (18) in the circumferential direction. When the key pin (1502) exits the needle groove (1701), the key handle (15) and the key plate (17) rotate relative to each other, and the key plate (17) and the key cylinder (18) maintain a circumferential engagement and fixation.

10. The interchangeable key structure according to claim 8, characterized in that: The key bar (16) has a key bar hole (104) corresponding to the drive part (301) and also has a backstop block that cooperates with the anti-rebound structure. The backstop block includes an outer backstop block (1602) that cooperates with the outer longitudinal groove (11) and the annular groove (12), or an inner backstop block (1603) that cooperates with the inner longitudinal groove (13) and the circumferential backstop groove (14).

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