Anti-vandal lock cylinder

Abstract

The present invention relates to the technical field of lock cylinders. Disclosed is an anti-vandal lock cylinder. The present invention comprises a lock housing, a cam and a clutch, and the lock housing consists of a middle housing and two side housings; the middle portion of the middle housing is provided with a cam opening, and an inner connection sleeve and an outer connection sleeve are formed on both sides of the middle housing by the cam opening; both sides of the middle housing are provided with guide pins, and the two side housings are symmetrically arranged at two ends of the middle housing. In the present invention, the lock housing is divided into two side housings and one middle housing, such that the outer side housing can be quickly separated from a connection point with the middle housing in the event of vandalism, so as to cause a locking pin to lift and lock an outer connection section, thereby providing a first protective measure; the design of an outer clutch having a retractable tongue provides a second protection measure; and by means of cooperation between a locking cam pin and a locking cam opening and in combination with ejection of a third spring within an inner clutch, a third protection measure is realized, such that the triple protection in the lock cylinder enables active locking of the cam in the event of vandalism, thereby improving the safety.

Description

A lock cylinder resistant to forced entry Technical Field

[0001] This invention belongs to the field of lock cylinder technology, and in particular relates to a lock cylinder that is resistant to violent destruction. Background Technology

[0002] For forced entry into lock cylinders, the first step is to use tools to break the lock from the outside. Generally, various tools are used to damage the outside of the lock cylinder. If the lock cylinder is damaged or broken, the dial can be easily turned to unlock it. Once the dial is turned, the lock can be opened, which is not secure enough.

[0003] If a lock cylinder is designed to automatically lock the dial after the outer side of the lock cylinder is damaged, the security of the lock cylinder can be greatly improved, making it more difficult to break in. However, if the outer side of the lock cylinder is damaged, it may damage the clutch connecting the dial and the lock cylinder, causing the lock to be locked from the inside.

[0004] Therefore, designing a lock cylinder that can automatically lock the dial even when damaged without affecting unlocking from the inside of the door is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a lock cylinder resistant to violent destruction. By dividing the lock shell into two side shells and a middle shell, it ensures that the outer side shells can quickly separate from the connection point of the middle shell after being damaged. This causes the locking pin to lift and lock the outer section, providing the first protective measure. The design of a retractable external clutch with a convex tongue provides the second protective measure. The cooperation between the lock wheel pin and the lock wheel opening, combined with the ejection of the third spring in the internal clutch, achieves the third protective measure. The triple protection in the lock cylinder can actively lock the dial after being damaged, greatly improving the lock cylinder's ability to resist violent destruction and enhancing security.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0007] This invention is a lock cylinder resistant to violent destruction, comprising a lock shell, a dial, and a clutch;

[0008] The lock housing consists of a middle housing and two side housings. The middle housing has a dial opening in the middle, and the dial opening forms an inner sleeve and an outer sleeve on both sides of the middle housing. Guide pins are provided on both sides of the middle housing.

[0009] The two side shells are symmetrically arranged at both ends of the middle shell. The inner side of each side shell is provided with a guide groove, and the guide pin is fixed in the guide groove.

[0010] The two side housings are respectively provided with an outer lock cylinder and an inner lock cylinder. The outer lock cylinder and the inner lock cylinder are linearly provided with several tumbler mechanisms between them and the side housings. The inner end of the outer lock cylinder is movably connected to an outer section. The outer section is set in an outer sleeve. The outer section is connected to the end of the outer lock cylinder through a protrusion mechanism. The peripheral side of the outer section is provided with a locking port and an external connection port.

[0011] The intermediate shell has a through-hole facing the axis of the outer sleeve. The intermediate shell has an actuating groove communicating with the through-hole on the side near the outer sleeve. An actuating pin is provided in the actuating groove. One end of the actuating pin has a cavity. A first spring is provided in the cavity. The two ends of the actuating pin are respectively attached to the inner wall of the through-hole and the inner side of the side shell. A locking pin is fixed to the end of the through-hole away from the outer sleeve by a second spring. The locking pin is located between the actuating pin and the second spring.

[0012] The inner end of the inner lock cylinder is provided with a cylindrical cavity, and the peripheral side of the inner end of the inner lock cylinder is provided with an inner connection port and a lock wheel port;

[0013] The clutch includes an inner clutch part and an outer clutch part. The inner clutch part includes a spring cover, a third spring and an inner clutch column connected in sequence. The inner clutch part is slidably disposed in a cylindrical cavity. The peripheral side of the inner clutch column is provided with an inner protruding edge that cooperates with the dial wheel and the inner connection port. The inner clutch column is provided with a preset opening. A locking pin is slidably connected in the preset opening. The locking pin and the locking opening are linearly distributed.

[0014] The external clutch includes an external clutch column, a clutch pin, and a tongue. The external clutch column has a horizontal opening at its axis and an inner recess on its peripheral side. The tongue is slidably disposed within the inner recess and a fourth spring is provided between the tongue and the inner recess. The tongue has an upper opening and a lower opening. One end of the clutch pin passes through the outer connecting section and is fixedly connected to the inner end of the external lock cylinder. The other end of the clutch pin passes through the horizontal opening and the lower opening. A locking head is fixed in the upper opening by a fifth spring. The end of the external clutch column away from the clutch pin has an external locking port that communicates with the inner recess. The locking head and the external locking port are in clearance fit.

[0015] Furthermore, when the outer side of the lock cylinder is violently broken, the side housing with the outer lock cylinder, the outer lock cylinder, the clutch pin, and the guide pin of the intermediate housing near the outer lock cylinder break off and detach. Without the obstruction of the side housing, the first spring pops the touch pin out of the touch groove. The locking pin passes through the touch pin by the elastic force of the second spring and gets stuck in the locking hole of the outer section. At this time, the outer section cannot rotate, and the corresponding dial is locked.

[0016] Furthermore, when the outer side of the lock cylinder is violently broken, the outer lock cylinder and the side housing break off. The clutch pin is pulled out and disengaged from the horizontal opening and the lower through-hole along with the outer lock cylinder. The tongue is fully retracted into the inner recess by the fourth spring. When the upper through-hole is concentric with the outer lock opening, the locking head extends out and is stuck in the outer lock opening by the fifth spring. At this time, the outer surface of the outer clutch pin is smoothly disconnected from the dial wheel, and even if the outer clutch part rotates, it cannot drive the dial wheel to rotate.

[0017] Furthermore, when the outer side of the lock cylinder is violently broken, the clutch pin is pulled out, creating a clearance space between the inner clutch part and the outer connecting section. The elastic force of the third spring pushes the inner clutch pin and the outer clutch pin to move towards the outer connecting section. When the lock wheel pin moves to the lock wheel opening position, it falls into the lock wheel opening due to gravity, causing the outer clutch pin to move away from the dial wheel. The dial wheel is connected to the inner lock cylinder through the inner clutch part, and there is no interference between the outer clutch part and the dial wheel.

[0018] Furthermore, the side housing is composed of a bead-loading part and a core-loading part. The bead-loading part is provided with a plurality of ball slots communicating with the core-loading part, and the guide groove is located at the edge of the bead-loading part and away from the ball mechanism.

[0019] Furthermore, both the inner and outer lock cylinders are provided with keyholes, and both the inner and outer lock cylinders have a plurality of bullet openings that communicate with the keyholes on their peripheral surfaces. The plurality of bullet openings are respectively opposite to a plurality of pin slots, and the pin mechanism is installed in the bullet openings and pin slots.

[0020] Furthermore, both sides of the bead-loading part are provided with a set of fastening ports communicating with the guide groove. The guide pin is provided with a fastening point opposite to the position of the fastening port. A fastening screw is provided in the fastening port, and the inner end face of the fastening screw extends into the fastening point of the guide pin.

[0021] Furthermore, the guide pin is integrally formed with the intermediate shell, and the guide pin near the outer lock core has a fracture guide groove on one side of the intermediate shell.

[0022] Furthermore, the outer section end face is provided with a set of grooves, and the outer lock core end face is provided with a protrusion that fits the grooves with a gap.

[0023] Furthermore, the intermediate shell is made of high-strength steel.

[0024] The present invention has the following beneficial effects:

[0025] This invention divides the lock housing into two side housings and a middle housing, connected by guide pins. Upon damage, this ensures the outer side housings can quickly separate from the middle housing connection point, providing an active break point. This causes the locking pin to lift and lock the outer section, thus locking the clutch and shifter, providing the first protective measure. The retractable external clutch design allows it to retract and disengage from the shifter after damage, preventing rotation of the external clutch from affecting the shifter. Even if the external clutch rotates, the rotation will not be transmitted to the shifter. If the first protective measure fails, the second protective measure can still be performed. The protection mechanism, through the cooperation of the locking wheel pin and locking wheel opening, combined with the ejection of the third spring in the inner clutch, establishes a connection between the inner lock cylinder and the inner clutch after damage. The inner lock cylinder then locks the dial again, achieving the third protective measure. This triple protection system in the lock cylinder actively locks the dial after damage, greatly improving the lock cylinder's ability to resist violent damage and enhancing security. At the same time, it does not affect the use of the inner lock cylinder. Even if the outer lock cylinder is damaged, it does not prevent the lock cylinder from being opened from the inside of the door, avoiding situations where the door cannot be opened due to lock cylinder damage.

[0026] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 is an exploded view of the structure of a lock cylinder resistant to violent destruction according to the present invention;

[0029] Figure 2 is a cross-sectional view of the structure of the present invention;

[0030] Figure 3 is a schematic diagram of the structure of the intermediate shell and the outer clutch;

[0031] Figure 4 is a schematic diagram of the side shell and the inner clutch;

[0032] Figure 5 is a schematic diagram of the external clutch section;

[0033] Figure 6 is a cross-sectional view of the external clutch section;

[0034] Figure 7 is an exploded view of the external clutch section;

[0035] The components represented by each number in the attached diagram are listed below: 1-Dial, 2-Outer lock cylinder, 3-Inner lock cylinder, 4-Pin mechanism, 5-Intermediate housing, 6-Side housing, 7-Inner clutch, 8-Outer connecting section, 9-Outer clutch, 301-Cylindrical cavity, 302-Inner connecting port, 303-Lock wheel port, 501-Dial port, 502-Inner connecting sleeve, 503-Outer connecting sleeve, 504-Guide pin, 505-Through port, 506-Actuating groove, 507-Actuating pin, 508-Break guide groove, 509-First spring, 510-Locking pin, 511-Second spring, 512-Fastening point, 601-Guide groove, 602-Bead loading part, 603-Core loading part, 60 4-Pellet groove, 605-Fasting port, 701-Inner clutch post, 702-Spring cover, 703-Third spring, 704-Inner convex edge, 705-Lock pin, 801-Lock-off port, 802-Outer connecting port, 803-Groove, 901-Outer clutch post, 902-Clutch pin, 903-Protruding tongue, 904-Inner recess, 905-Fourth spring, 906-Upper through port, 907-Lower through port, 908-Fifth spring, 909-Locking head, 910-Outer locking port, 911-Horizontal opening. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Please refer to Figures 1-7. The present invention is a lock cylinder resistant to violent destruction, including a lock shell, a dial 1, and a clutch;

[0038] The lock housing consists of a middle housing 5 and two side housings 6. The middle housing 5 has a dial opening 501 in the middle. The inner sleeve 502 and the outer sleeve 503 are formed by the dial opening 501 on both sides of the middle housing 5. Guide pins 504 are provided on both sides of the middle housing 5.

[0039] The two side shells 6 are symmetrically arranged at both ends of the middle shell 5. The inner side of the side shell 6 is provided with a guide groove 601, and the guide pin 504 is fixed in the guide groove 601.

[0040] The outer lock cylinder 2 and the inner lock cylinder 3 are respectively provided in the two side housings 6. The outer lock cylinder 2 and the inner lock cylinder 3 are linearly provided with several tumbler mechanisms 4 between them and the side housings 6. The inner end of the outer lock cylinder 2 is movably connected to an outer section 8. The outer section 8 is set in the outer sleeve 503. The outer section 8 is connected to the end of the outer lock cylinder 2 through a protrusion mechanism. The outer section 8 has a locking port 801 and an outer connection port 802 on its circumferential side.

[0041] The intermediate shell 5 is provided with a through opening 505 facing the axis of the outer sleeve 503. The intermediate shell 5 is provided with an actuating groove 506 communicating with the through opening 505 on the side near the outer sleeve 503. An actuating pin 507 is provided in the actuating groove 506. One end of the actuating pin 507 is provided with a cavity. A first spring 509 is provided in the cavity. The two ends of the actuating pin 507 are respectively attached to the inner wall of the through opening 505 and the inner side of the side shell 6. A locking pin 510 is fixed to the end of the through opening 505 away from the outer sleeve 503 by a second spring 511. The locking pin 510 is located between the actuating pin 507 and the second spring 511.

[0042] The inner end of the inner lock cylinder 3 is provided with a cylindrical cavity 301, and the circumferential side of the inner end of the inner lock cylinder 3 is provided with an inner connection port 302 and a lock wheel port 303.

[0043] The clutch includes an inner clutch part 7 and an outer clutch part 9. The inner clutch part 7 includes a spring cover 702, a third spring 703 and an inner clutch column 701 connected in sequence. The inner clutch part 7 is slidably disposed in the cylindrical cavity 301. The inner clutch column 701 has an inner protruding edge 704 on its peripheral side that cooperates with the dial wheel 1 and the inner connection port 302. The inner clutch column 701 has a preset opening. A locking pin 705 is slidably connected in the preset opening. The locking pin 705 and the locking opening 303 are linearly distributed.

[0044] The external clutch part 9 includes an external clutch column 901, a clutch pin 902, and a tongue 903. The external clutch column 901 has a horizontal opening 911 at its axis and an inner recess 904 on its peripheral side. The tongue 903 is slidably disposed in the inner recess 904 and a fourth spring 905 is provided between the tongue 903 and the inner recess 904. The tongue 903 has an upper through-hole 906 and a lower through-hole 907. One end of the clutch pin 902 passes through the outer connecting section 8 and is fixedly connected to the inner end of the external lock core 2. The other end of the clutch pin 902 passes through the horizontal opening 911 and the lower through-hole 907. A locking head 909 is fixed in the upper through-hole 906 by a fifth spring 908. The outer clutch column 901 has an external locking port 910 that communicates with the inner recess 904 at the end away from the clutch pin 902. The locking head 909 and the external locking port 910 are in clearance fit.

[0045] When the outer side of the lock cylinder is violently broken, the side housing 6 with the outer lock cylinder 2, the outer lock cylinder 2, the clutch pin 902, and the guide pin 504 of the intermediate housing 5 near the outer lock cylinder 2 break off. Without the obstruction of the side housing 6, the first spring 509 pops the touch pin 507 out of the touch groove 506. The locking pin 510 passes through the touch pin 507 by the elastic force of the second spring 511 and gets stuck in the locking port 801 of the outer section 8. At this time, the outer section 8 cannot rotate, and the corresponding dial 1 is locked.

[0046] When the outer side of the lock cylinder is violently broken, the outer lock cylinder 2 and the side housing 6 break off. The clutch pin 902 is pulled out and disengaged from the horizontal opening 911 and the lower through opening 907 along with the outer lock cylinder 2. The tongue 903 is completely retracted into the inner recess 904 by the fourth spring 905. When the upper through opening 906 is concentric with the outer lock opening 910, the locking head 909 extends out and is stuck in the outer lock opening 910 by the fifth spring 908. At this time, the outer surface of the outer clutch pin 901 is smoothly disconnected from the dial wheel 1. Even if the outer clutch part 9 rotates, it cannot drive the dial wheel 1 to rotate.

[0047] When the outer side of the lock cylinder is violently broken, the clutch pin 902 is pulled out, creating a clearance space between the inner clutch part 7 and the outer connecting section 8. The elastic force of the third spring 703 pushes the inner clutch pin 701 and the outer clutch pin 901 to move towards the outer connecting section 8. When the lock wheel pin 705 moves to the lock wheel opening 303, it falls into the lock wheel opening 303 due to gravity, causing the outer clutch pin 901 to move away from the dial wheel 1. The dial wheel 1 is connected to the inner lock cylinder 3 through the inner clutch part 7, and the outer clutch part 9 does not interfere with the dial wheel 1.

[0048] As shown in Figures 1-4, the side housing 6 is composed of a bead-loading part 602 and a core-loading part 603. The bead-loading part 602 is provided with a plurality of ball slots 604 that communicate with the core-loading part 603. The guide slot 601 is located at the edge of the bead-loading part 602 and away from the ball mechanism 4.

[0049] As shown in Figures 1-2 and 4, both the inner lock cylinder 3 and the outer lock cylinder 2 are provided with keyholes. Both the inner lock cylinder 3 and the outer lock cylinder 2 are provided with several bullet openings that communicate with the keyholes on their peripheral sides. The bullet openings are respectively positioned opposite to several pin slots 604. The pin mechanism 4 is installed in the bullet openings and the pin slots 604.

[0050] As shown in Figures 1-4, both sides of the bead-loading part 602 are provided with a set of fastening ports 605 that communicate with the guide groove 601. The guide pin 504 is provided with fastening points 512 that are opposite to the fastening ports 605. A fastening screw is provided in the fastening port 605, and the inner end face of the fastening screw extends into the fastening point 512 of the guide pin 504.

[0051] As shown in Figures 1-3, the guide pin 504 is integrally formed with the intermediate shell 5, and the guide pin 504 near the outer lock core 2 has a fracture guide groove 508 on the circumferential side of the end near the intermediate shell 5.

[0052] As shown in Figure 3, the outer section 8 has a set of grooves 803 on its end face, and the outer lock cylinder 2 has a protrusion that fits the grooves 803 with a clearance.

[0053] The intermediate shell 5 is made of high-strength steel. The use of high-strength steel can improve the drilling resistance of the intermediate shell 5 and prevent damage caused by drill bits and other tools.

[0054] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0055] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A lock cylinder resistant to violent destruction, comprising a lock housing, a dial (1), and a clutch, characterized in that: The lock housing consists of a middle shell (5) and two side shells (6); The intermediate shell (5) has a dial port (501) in the middle, and the intermediate shell (5) has an inner sleeve (502) and an outer sleeve (503) on both sides. The intermediate shell (5) also has guide pins (504) on both sides. The two side shells (6) are symmetrically arranged at both ends of the middle shell (5). The inner side of the side shell (6) is provided with a guide groove (601), and the guide pin (504) is fixed in the guide groove (601). The two side housings (6) are respectively provided with an outer lock cylinder (2) and an inner lock cylinder (3). The inner end of the outer lock cylinder (2) is movably connected to an outer section (8). The outer section (8) is located in an outer sleeve (503) and connected to the end of the outer lock cylinder (2). The outer section (8) has a locking opening (801) and an outer connection opening (802) on its peripheral side. The intermediate shell (5) is provided with a through opening (505) facing the axis of the outer sleeve (503). The intermediate shell (5) is provided with an actuating groove (506) communicating with the through opening (505). An actuating pin (507) is connected in the actuating groove (506) by a first spring (509). The actuating pin (507) is located between the through opening (505) and the side shell (6). A locking pin (510) is fixed in the through opening (505) by a second spring (511). The top end of the locking pin (510) contacts the actuating pin (507). The inner end of the inner lock cylinder (3) is provided with a cylindrical cavity (301), and the circumferential side of the inner end of the inner lock cylinder (3) is provided with an inner connection port (302) and a lock wheel port (303); The clutch includes an inner clutch part (7) and an outer clutch part (9). The inner clutch part (7) is composed of a spring cover (702) slidably disposed in a cylindrical cavity (301), a third spring (703) and an inner clutch column (701). The inner clutch column (701) has an inner protruding edge (704) on its peripheral side that cooperates with the dial wheel (1) and the inner connection port (302). A locking pin (705) is embedded in and slidably connected to the inner clutch column (701). The locking pin (705) and the locking port (303) are linearly distributed. The external clutch part (9) includes an external clutch post (901), a clutch pin (902), and a tab (903). The external clutch post (901) has a horizontal opening (911) at its axis and an inner recess (904). The tab (903) is slidably disposed in the inner recess (904) by a fourth spring (905). The tab (903) has an upper opening (906) and a lower opening. (907) One end of the clutch pin (902) passes through the outer section (8) and is connected to the inner end face of the outer lock cylinder (2). The other end of the clutch pin (902) passes through the horizontal opening (911) and the lower through opening (907). The upper through opening (906) is fixed with a locking head (909) by a fifth spring (908). The outer clutch pin (901) is provided with an outer lock opening (910) that is clearance-fitted with the outer lock opening (910).

2. The lock cylinder against violent destruction according to claim 1, characterized in that, When the outer side of the lock cylinder is violently broken, the side housing (6) with the outer lock cylinder (2), the outer lock cylinder (2), the clutch pin (902) and the intermediate housing (5) near the guide pin (504) of the outer lock cylinder (2) break off. The actuating pin (507) is not blocked by the side housing (6). The first spring (509) pops the actuating pin (507) out of the actuating groove (506). The locking pin (510) passes through the actuating pin (507) by the elastic force of the second spring (511) and gets stuck in the locking hole (801) of the outer section (8). At this time, the outer section (8) cannot rotate, and the corresponding dial (1) is locked.

3. A lock cylinder resistant to violent destruction according to claim 2, characterized in that, When the outer side of the lock cylinder is violently broken, the outer lock cylinder (2) and the side housing (6) break off. The clutch pin (902) is pulled out and disengaged from the horizontal opening (911) and the lower through opening (907) along with the outer lock cylinder (2). The tongue (903) is completely retracted into the inner recess (904) by the fourth spring (905). When the upper through opening (906) is concentric with the outer lock opening (910), the locking head (909) extends out and is stuck in the outer lock opening (910) by the fifth spring (908). At this time, the outer surface of the outer clutch pin (901) is smoothly disconnected from the dial wheel (1). Even if the outer clutch part (9) rotates, it cannot drive the dial wheel (1) to rotate.

4. A lock cylinder resistant to violent destruction according to claim 3, characterized in that, When the outer side of the lock cylinder is violently broken, the clutch pin (902) is pulled out, and a clearance space is formed between the inner clutch part (7) and the outer connecting section (8). The elastic force of the third spring (703) pushes the inner clutch pin (701) and the outer clutch pin (901) to move towards the outer connecting section (8). When the lock wheel pin (705) moves to the lock wheel opening (303), it falls into the lock wheel opening (303) with gravity, causing the outer clutch pin (901) to move away from the dial wheel (1). The dial wheel (1) is connected to the inner lock cylinder (3) through the inner clutch part (7), and the outer clutch part (9) does not interfere with the dial wheel (1).

5. A lock cylinder resistant to violent destruction according to claim 1, characterized in that, The outer lock cylinder (2) and the inner lock cylinder (3) are linearly provided with a plurality of tumbler mechanisms (4) between them and the side housing (6). The side housing (6) is composed of a bead-loading part (602) and a core-loading part (603). The bead-loading part (602) is provided with a plurality of tumbler grooves (604) that communicate with the core-loading part (603). The guide groove (601) is located at the edge of the bead-loading part (602) and away from the tumbler mechanism (4).

6. A lock cylinder resistant to violent destruction according to claim 5, characterized in that, Both the inner lock cylinder (3) and the outer lock cylinder (2) are provided with keyholes. Both the inner lock cylinder (3) and the outer lock cylinder (2) are provided with a number of bullet openings that communicate with the keyholes on their peripheral sides. The number of bullet openings are respectively opposite to the positions of a number of pin slots (604). The pin mechanism (4) is installed in the bullet openings and the pin slots (604).

7. A lock cylinder resistant to violent destruction according to claim 1, characterized in that, Both sides of the bead-loading part (602) are provided with a set of fastening ports (605) communicating with the guide groove (601). The guide pin (504) is provided with fastening points (512) opposite to the fastening ports (605). A fastening screw is provided in the fastening port (605), and the inner end face of the fastening screw extends into the fastening point (512) of the guide pin (504).

8. A lock cylinder resistant to violent destruction according to claim 7, characterized in that, The guide pin (504) is integrally formed with the intermediate shell (5), and the guide pin (504) near the outer lock core (2) has a fracture guide groove (508) on the circumferential side of the end near the intermediate shell (5).

9. A lock cylinder resistant to violent destruction according to claim 1, characterized in that, The outer section (8) has a set of grooves (803) on its end face, and the outer lock core (2) has a protrusion that fits the grooves (803) with a gap.

10. A lock cylinder resistant to violent destruction according to claim 1, characterized in that, The intermediate shell (5) is made of high-strength steel.

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