Anti-breakage unlocking lock cylinder

Abstract

The application discloses a lock cylinder with anti-damage unlocking function, which comprises a core body, a lock channel for inserting a key is arranged in the core body and penetrates through the outer end surface of the core body, a plurality of insertion grooves for accommodating an insertion part are arranged in the core body, and the insertion part is provided with an inner groove with a higher hardness than the core body; when the insertion part is located in the insertion groove, the width of the inner groove is greater than or equal to the width of the corresponding position of the lock channel. The application aims to provide the lock cylinder with anti-damage unlocking function, which has better displacement resistance and better anti-theft function.

Description

Technical Field

[0001] This invention relates to the field of anti-theft locks, and more particularly to lock cylinders designed to prevent destructive unlocking. Background Technology

[0002] As a traditional security device, locks have a long history of development. The core objective of anti-theft locks has always been to effectively prevent unauthorized opening while ensuring convenient access for authorized users. The evolution of anti-theft locks is essentially a process of continuous struggle and upgrading against unlocking technologies (including technical and destructive unlocking).

[0003] Destructive lock picking refers to using force to forcibly break the lock cylinder, pull on the lock cylinder, or even cut the door to open it. Cutting the door is more noisy and requires heavy equipment, so it is relatively rare. Thieves typically use two main destructive lock picking methods: 1. Drilling holes to damage the pins; 2. Drilling into the lock cylinder with tools such as self-tapping screws, creating a pulling surface that allows the lock cylinder to be pulled out, thus destroying the lock.

[0004] To prevent drilling and pulling, existing lock cylinders primarily employ several anti-drilling pins near the unlocking end, as disclosed in Chinese Utility Model Patent CN207583104U. When a drill bit or self-tapping screw encounters an anti-drilling pin, it becomes less stable, thus delaying the drill's insertion and forcing the thief to abandon destructive unlocking. However, this mechanism has the following problems: due to the relatively small diameter of the anti-drilling pins, a drill bit or self-tapping screw may pass precisely between two opposing anti-drilling pins. Furthermore, due to its structure, a drill bit that has passed through can easily create a pulling surface with the lock cylinder, potentially requiring only about 10KN of pulling force to pull the lock cylinder out, thus achieving destructive unlocking. Summary of the Invention

[0005] Purpose of the invention: The purpose of this invention is to provide a lock cylinder with good resistance to displacement and good anti-theft function, and resistant to destructive unlocking.

[0006] Technical solution: In this invention, the direction facing outwards from the lock cylinder is defined as "outer", the direction facing inwards from the lock cylinder is defined as "inner", the end face of the lock cylinder facing outwards and used for key insertion is defined as the outer end face, and the other end face of the lock cylinder is defined as the inner end face.

[0007] The lock cylinder for preventing destructive unlocking according to the present invention includes a core body with a lock track for key insertion. The lock track penetrates the outer end face of the core body. The core body also has several insertion slots for accommodating insertion parts. Insertion parts with a hardness higher than that of the core body are placed within the insertion slots. The insertion parts have internally formed grooves. When the insertion part is located within an insertion slot, the width of the internal groove is greater than or equal to the width of the corresponding lock track. Because the hardness of the insertion parts is higher than that of the core body, when attacked by a drill bit or self-tapping screw, the head of the drill bit or self-tapping screw will be blocked by the insertion parts, or the side of the drill bit or self-tapping screw will be worn down, thereby weakening or even eliminating its destructive ability and prolonging the unlocking time.

[0008] Furthermore, the insertion groove extends through the outer periphery of the core to form at least one slot for insertion of the insertion part.

[0009] Furthermore, when the insertion part is located in the insertion groove, the insertion part and the insertion groove are either interference fit or clearance fit.

[0010] Furthermore, when the insertion part is located within the insertion slot, the insertion part is detachably connected to the insertion slot.

[0011] Furthermore, the hardness of the insertion portion is 50HRC to 80HRC.

[0012] Furthermore, the core is provided with several chip removal grooves. The chip removal grooves serve two functions: 1. When the core encounters a drill hole, it can quickly remove chips, preventing the accumulation of iron chips from forming a pulling working surface that facilitates the pulling of the core, thus preventing the core from being pulled out quickly; 2. After setting the chip removal grooves, the contact area between the core and the pulling tool is reduced, thereby minimizing the formation of a pulling working surface that facilitates the pulling of the core after drilling.

[0013] Furthermore, the insertion groove is located between the outer end face and the chip removal groove. This arrangement allows the drill bit to be stopped in time when the core encounters a drill hole, forcing the drill bit to slide during destructive unlocking, thereby extending the unlocking time.

[0014] Furthermore, the top of the insertion part is provided with several top positioning pins, and the core body is provided with top positioning holes corresponding to the top positioning pins.

[0015] Furthermore, the insertion section includes several independent inserts. This allows for better matching with different locking tracks and prevents interference between the insertion section and the locking track.

[0016] Furthermore, a side positioning pin is provided on the side of the insert, and a side positioning hole corresponding to the side positioning pin is formed on the core.

[0017] Furthermore, the cross-section of the anti-theft end face of the insertion part (the anti-theft end face is the end face of the insertion part facing the outer end face) is a straight line, an arc, or a combination of various known lines. The advantage of the cross-section of the end face of the insertion part facing the outer end face being arc is that when the core encounters a drill hole, the arc shape allows the drill bit to slide better; the advantage of the cross-section of the end face of the insertion part facing the outer end face being straight is that it is easier to process and the molding cost is lower.

[0018] Furthermore, the insertion groove is located between the inner end face and the chip removal groove.

[0019] Furthermore, the core is provided with several locking channels. The locking channels are connected to the lock track and are used to accommodate the locking pins of the anti-theft lock.

[0020] Furthermore, the position of the locking channel's central axis does not correspond to the chip removal groove. This is to prevent the core from being too thin in certain areas, resulting in lower strength.

[0021] Beneficial Effects: Compared with the prior art, the present invention has the following advantages: 1. The insertion part in the present invention is a surface protection, which can cover the remaining surface of the outer end face except for the locking channel as much as possible, and stop the drill bit as much as possible; 2. Since the strength of the insertion part is higher than that of the core, when the drill bit or self-tapping screw attacks, the head of the drill bit or self-tapping screw will be blocked by the insertion part, or the side of the drill bit or self-tapping screw will be worn, thereby weakening or even losing its destructive ability, thus prolonging the unlocking time and forcing the thief to give up unlocking; 3. The hardness of the insertion part is 50HRC~80HRC, which is greater than the hardness of common drill bits on the market (48HRC), making it difficult for the drill bit to drill through, which can also prolong the unlocking time and force the thief to give up unlocking; 4. If the insertion part is located in the insertion groove, the insertion part and the insertion groove are fitted with a gap, and the drill bit will slide a certain amount when attacking the insertion part, making the drill bit unable to... 5. The cross-section of the outer end face of the insertion part is a straight line, an arc, or a combination of various known lines. When the core encounters a drill hole, it can make the drill bit slide as much as possible and not be easy to center, thus prolonging the unlocking time. 6. The insertion part can be composed of several independent inserts. It is not necessary to set only one insert. This not only avoids the possibility of interfering with the lock track during assembly and making it impossible to insert the key, but also avoids the possibility of the edge of the inner groove, especially the narrow connection, being broken when attacked when only one insert is set. 7. The chip removal groove can quickly remove chips when encountering a drill hole, preventing metal chips from accumulating and forming a stable contact surface with the drill bit. It can also reduce the contact surface between the core and the self-tapping screw, and prevent the core from being pulled out of the lock body as much as possible, that is, improve the core's resistance to displacement. Attached Figure Description

[0022] Figure 1 This is a perspective view of the first embodiment of the present invention from one angle.

[0023] Figure 2 This is a perspective view of the first embodiment of the present invention from another angle.

[0024] Figure 3 This is a perspective view of the first core at one angle in the first embodiment of the present invention.

[0025] Figure 4 This is a cross-sectional view of the first core in the first embodiment of the present invention.

[0026] Figure 5 This is a schematic diagram of the first insertion part in the first embodiment of the present invention.

[0027] Figure 6 This is a top view of the first insertion part in the first embodiment of the present invention.

[0028] Figure 7 This is a top view of the second insertion part in the second embodiment of the present invention.

[0029] Figure 8 This is a perspective view of the third embodiment of the present invention.

[0030] Figure 9 This is a perspective view of the third core in the third embodiment of the present invention.

[0031] Figure 10 This is a schematic diagram of the third insertion part in the third embodiment of the present invention.

[0032] Figure 11 This is a perspective view of the fourth embodiment of the present invention. Figure 12 This is a perspective view of the fourth core at one angle in the fourth embodiment of the present invention.

[0033] Figure 13 This is a perspective view of the fourth core from another angle in the fourth embodiment of the present invention.

[0034] Figure 14 This is a schematic diagram of the fourth insertion part in the fourth embodiment of the present invention.

[0035] Figure 15 This is a perspective view of the fifth embodiment of the present invention.

[0036] Figure 16 This is a perspective view of the fifth core at one angle in the fifth embodiment of the present invention.

[0037] Figure 17 This is a perspective view of the fifth core from another angle in the fifth embodiment of the present invention.

[0038] Figure 18 This is a schematic diagram of the fifth insertion part in the fifth embodiment of the present invention.

[0039] Figure 19 This is a perspective view of the sixth core in the sixth embodiment of the present invention.

[0040] Wherein: 1. First core; 101. First locking channel; 102. First outer end face; 103. First chip removal groove; 104. First locking channel; 105. First inner end face; 106. First insertion groove; 2. First insertion part; 201. First outer anti-theft end face; 202. First inner groove; 203. First connection point; 204. First side; 205. First inner anti-theft end face; 3. Second insertion part; 301. Second outer anti-theft end face; 302. Second inner anti-theft end face; 4. 401. Third core; 402. Third outer end face; 403. Third chip removal groove; 404. Third locking channel; 405. Third top positioning hole; 406. Third inner end face; 407. Third insertion groove; 5. Third insertion part; 501. Third left insertion piece; 502. Third right insertion piece; 503. Third inner groove; 504. Third top positioning pin; 6. Fourth core; 601. Fourth locking groove; 602. Fourth outer end face; 603. Fourth chip removal groove; 604. Fourth locking channel; 605. Fourth top positioning hole; 606. Fourth inner end face; 607. Fourth insertion groove; 608. Fourth groove wall; 7. Fourth insertion part; 701. Fourth left insertion piece; 702. Fourth right insertion piece; 703. Fourth inner groove; 704. Fourth top positioning pin; 8. Fifth core; 801. Fifth locking channel; 802. Fifth outer end face; 8021. Fifth outer connecting hole; 803. Fifth chip removal groove; 804. Fifth locking channel; 805. 806. Fifth side positioning hole; 807. Fifth inner end face; 808. Fifth insertion groove; 909. Fifth insertion part; 9001. Fifth left insertion piece; 9011. Fifth left connecting hole; 902. Fifth right insertion piece; 9021. Fifth right connecting hole; 903. Fifth part inner groove; 904. Fifth side positioning pin; 10. Sixth core; 1001. Sixth locking channel; 1002. Sixth outer end face; 1003. Sixth chip removal groove; 1004. Sixth inner end face; 1005. Sixth insertion groove. Detailed Implementation

[0041] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0042] Example 1

[0043] See appendix Figures 1-6The lock cylinder for preventing destructive unlocking shown in this invention includes a first core 1. A first lock channel 101 for key insertion is formed inside the first core 1. The first lock channel 101 penetrates the first outer end face 102 of the first core 1. A first insertion groove 106 for accommodating a first insertion part 2 is also provided inside the first core 1. The first insertion part 2 with a hardness higher than that of the first core 1 is provided inside the first insertion groove 106. The first insertion groove 106 penetrates the outer periphery of the first core 1 to form a slot located below for the insertion of the first insertion part 2. A first inner groove 202 is formed inside the first insertion part 2. When the first insertion part 2 is located inside the first insertion groove 106, the width of the first inner groove 202 is equal to the width of the first lock channel 101 at the corresponding position. In this embodiment, the first insertion part 2 includes only one integral insert. The shape of the first inner groove 202 formed in the first insertion part 2 is consistent with the shape of the first locking channel 101, and the width of the first inner groove 202 is equal to the width of the first locking channel 101 at the corresponding position. In other embodiments, the width of the first inner groove 202 may also be slightly wider than the width of the first locking channel 101 at the corresponding position. For example, the width of the first inner groove 202 may be 1 mm wider than the width of the first locking channel 101 at the corresponding position, which is equivalent to the width of the first inner groove 202 being equal to the width of the first locking channel 101 at the corresponding position.

[0044] Optionally, when the first insertion part 2 is located within the first insertion groove 106, the first insertion part 2 and the first insertion groove 106 are in an interference fit. In this embodiment, the interference fit between the first insertion part 2 and the first insertion groove 106 means that the first insertion part 2 is in an interference fit with the first insertion groove 106 in both the lateral direction (i.e., the direction penetrating the two first part side edges 204) and the front-back direction (i.e., the direction penetrating the first outer anti-theft end face 201-first inner anti-theft end face 205). This is to enhance the strength of the first insertion part 2 during use and prevent the edge of the first part inner groove 202, especially near the first connection 203, from breaking when the first insertion part 2 is attacked. In other embodiments, as long as either the lateral direction (i.e., the direction penetrating the two first part side edges 204) or the front-back direction (i.e., the direction penetrating the first outer anti-theft end face 201-first inner anti-theft end face 205) of the first insertion part 2 is in an interference fit with the first insertion groove 106, it is equivalent to this embodiment.

[0045] Optionally, the hardness of the first insertion part 2 is 55 HRC.

[0046] Optionally, the first core 1 is provided with a plurality of first chip removal grooves 103. Optionally, the first insertion groove 106 is located between the first outer end face 102 and the first chip removal grooves 103. This arrangement is such that when the first core 1 encounters a drill hole, it can stop the drill bit in time, and force the drill bit to slide during destructive unlocking, thereby prolonging the unlocking time. The other end of the first core 1 is the first inner end face 105.

[0047] Optionally, the cross-section of the first outer anti-theft end face 201 of the first insertion part 2 (the first outer anti-theft end face 201 is the end face of the first insertion part 2 facing the first outer end face 102) is straight. This has the advantage of being easy to process and having a lower molding cost.

[0048] Optionally, a plurality of first locking channels 104 are provided on the first core 1. The first locking channels 104 communicate with the first locking channels 101 and are used to accommodate the locking pins of the anti-theft lock.

[0049] Optionally, the position of the central axis of the first locking channel 104 does not correspond to the position of the first chip removal groove 103.

[0050] Example 2

[0051] See appendix Figure 7 Figure and reference attached Figures 1-6 The lock cylinder for preventing destructive unlocking shown in this invention differs from the first embodiment in that: the cross-section of the anti-theft end face of the insertion part (the anti-theft end face is the end face of the insertion part facing the outer end face).

[0052] In this embodiment, the second outer anti-theft end face 301 of the second insertion part 3 is a combination of an arc shape and a straight line. The advantage of this design is that when the core encounters a drill hole, it can better allow the drill bit to slide and is less likely to be centered. In other embodiments, the cross-section of the end face of the insertion part facing the inner end face (i.e., the second inner anti-theft end face 302) can also be non-linear, for example, it can be a combination of an arc shape and a straight line, or a combination of other known lines, which is equivalent to this embodiment.

[0053] Example 3

[0054] See appendix Figures 8-10 And refer to the appendix Figures 1-6The lock cylinder for preventing destructive unlocking shown in this invention includes a third core body 4. A third locking channel 401 for key insertion is formed within the third core body 4. The third locking channel 401 penetrates the third outer end face 402 of the third core body 4. A third insertion groove 407 for accommodating a third insertion part 5 is also provided within the third core body 4. The third insertion part 5 is disposed within the third insertion groove 407. The third insertion groove 407 penetrates the outer periphery of the third core body 4 to form a lower slot for insertion of the third insertion part 5. When the third insertion part 5 is located within the third insertion groove 407, a third inner groove 503 is formed inside the third insertion part 5. Optionally, the third insertion part 5 and the third insertion groove 407 are clearance-fitted.

[0055] Optionally, the third core 4 may be provided with several third chip removal grooves 403.

[0056] Optionally, the third insertion groove 407 is located between the third outer end face 402 and the third chip removal groove 403. This arrangement allows the drill bit to be stopped in time when the third core 4 encounters a hole, forcing the drill bit to slide during destructive unlocking, thereby extending the unlocking time. The other end of the third core 4 is the third inner end face 406.

[0057] Optionally, the third insertion part 5 includes a third left insertion member 501 and a third right insertion member 502 that are independent of each other. A third inner groove 503 is formed between the third left insertion member 501 and the third right insertion member 502. When the third insertion part 5 is located in the third insertion groove 407, the width of the third inner groove 503 is 0.5 mm wider than the width of the corresponding third locking channel 401. The third insertion part 5 includes a third left insertion member 501 and a third right insertion member 502 that are independent of each other. This can better match different third locking channels 401 and prevent interference between the insertion part and the third locking channel 401.

[0058] Optionally, the hardness of the third left insert 501 and the third right insert 502 is 63 HRC.

[0059] Optionally, a third top positioning pin 504 is provided on the top of the third left insert 501 and the third right insert 502 respectively, and two third top positioning holes 405 corresponding to the third top positioning pins 504 are opened on the third core 4.

[0060] Optionally, the cross-section of the anti-theft end face of the third insertion part 5 is a straight line.

[0061] Optionally, the third core 4 is provided with several third locking channels 404. The third locking channels 404 are connected to the third locking channels 401, and the third locking channels 404 are used to accommodate the locking pins of the anti-theft lock.

[0062] Optionally, the position of the central axis of the third locking channel 404 does not correspond to the position of the third chip removal groove 403.

[0063] Example 4

[0064] See appendix Figures 11-14 And refer to the appendix Figures 1-6 The lock cylinder for preventing destructive unlocking shown in this invention includes a fourth core 6. A fourth lock channel 601 for key insertion is formed in the fourth core 6. The fourth lock channel 601 penetrates the fourth outer end face 602 of the fourth core 6. The fourth core 6 is also provided with two fourth insertion slots 607 for accommodating the fourth insertion part 7. The fourth insertion part 7 is provided in the fourth insertion slot 607. Each fourth insertion slot 607 penetrates the outer periphery of the fourth core 6 to form a side opening for the insertion of the fourth insertion part 7. That is, a total of two slots are formed on the outer periphery of the fourth core 6.

[0065] Optionally, the fourth core 6 may be provided with several fourth chip removal slots 603.

[0066] Optionally, both fourth insertion slots 607 are located between the fourth outer end face 602 and the fourth chip removal slot 603. The other end of the fourth core 6 is the fourth inner end face 606.

[0067] Optionally, the fourth insertion part 7 includes two independent fourth left insertion pieces 701 and fourth right insertion pieces 702. In order to better cooperate with the fourth left insertion pieces 701 and fourth right insertion pieces 702, the fourth insertion groove 607 is provided with a fourth groove wall 608 for abutment in the direction of the fourth locking channel 601. That is, when the fourth left insertion piece 701 or the fourth right insertion piece 702 is located in the fourth insertion groove 607, the surface of the fourth left insertion piece 701 facing the fourth locking channel 601 abuts against the fourth groove wall 608, and the surface of the fourth right insertion piece 702 facing the fourth locking channel 601 abuts against the fourth groove wall 608. When the fourth insertion part 7 is located in the fourth insertion groove 607, a fourth inner groove 703 is formed between the fourth left insertion piece 701 and the fourth right insertion piece 702. The width of the fourth inner groove 703 (i.e., the distance between the two fourth groove walls 608) is greater than the width of the fourth locking channel 601 at the corresponding position. The stop of the fourth groove wall 608 can better prevent the insert from interfering with the fourth locking channel 601, making it easier to insert the key.

[0068] Optionally, the hardness of the fourth left insert 701 and the fourth right insert 702 is 73 HRC.

[0069] Optionally, the fourth left insert 701 is interference-fitted with the fourth insert groove 607, and the fourth right insert 702 is interference-fitted with the fourth insert groove 607.

[0070] Optionally, the top of the fourth left insert 701 and the fourth right insert 702 are respectively provided with a fourth top positioning pin 704, and two fourth top positioning holes 605 corresponding to the fourth top positioning pins 704 are opened on the fourth core 6.

[0071] Optionally, the cross-section of the anti-theft end face of the fourth insertion part 7 is a straight line.

[0072] Optionally, the fourth core 6 is provided with several fourth locking channels 604. The fourth locking channels 604 communicate with the fourth locking channels 601 and are used to accommodate the locking pins of the anti-theft lock.

[0073] Optionally, the position of the central axis of the fourth locking channel 604 does not correspond to that of the fourth chip removal groove 603.

[0074] Example 5

[0075] See appendix Figures 15-18 And refer to the appendix Figures 1-6 The lock cylinder for preventing destructive unlocking shown in this invention includes a fifth core body 8. A fifth locking channel 801 for key insertion is formed in the fifth core body 8. The fifth locking channel 801 penetrates the fifth outer end face 802 of the fifth core body 8. A fifth insertion groove 807 for accommodating a fifth insertion part 9 is also provided in the fifth core body 8. The fifth insertion part 9 is provided in the fifth insertion groove 807. The fifth insertion groove 807 penetrates the outer periphery of the fifth core body 8 to form two side slots for the insertion of the fifth insertion part 9.

[0076] Optionally, the fifth core 8 may be provided with several fifth chip removal slots 803.

[0077] Optionally, the fifth insertion groove 807 is located between the fifth outer end face 802 and the fifth chip removal groove 803. The other end of the fifth core 8 is the fifth inner end face 806.

[0078] Optionally, the fifth insertion part 9 includes a fifth left insertion member 901 and a fifth right insertion member 902 that are independent of each other; after the fifth left insertion member 901 and the fifth right insertion member 902 are respectively inserted into the fifth insertion groove 807 (that is, when the fifth insertion part 9 is located in the fifth insertion groove 807), a fifth inner groove 903 is formed between the fifth left insertion member 901 and the fifth right insertion member 902, and the width of the fifth inner groove 903 is equal to the width of the fifth locking channel 801 at the corresponding position. Two fifth external connecting holes 8021 are provided on the fifth outer end face 802. The fifth left insert 901 is provided with a fifth left connecting hole 9011, and the fifth right insert 902 is provided with a fifth right connecting hole 9021. When the fifth left insert 901 is in the fifth insertion slot 807, the fifth left connecting hole 9011 and the corresponding fifth external connecting hole 8021 are detachably connected by connecting screws (not shown for simplicity). When the fifth right insert 902 is in the fifth insertion slot 807, the fifth right connecting hole 9021 and the corresponding fifth external connecting hole 8021 are detachably connected by connecting screws (not shown for simplicity). In other embodiments, the fifth left insert 901 and the fifth right insert 902 can also be detachably connected to the fifth core 8 in other ways, such as by magnetic attraction.

[0079] Optionally, the hardness of the fifth left insert 901 and the fifth right insert 902 is 57 HRC.

[0080] Optionally, the fifth left insert 901 and the fifth right insert 902 are respectively provided with fifth side positioning pins 904, and a connecting block is provided in the fifth core 8. The connecting block is located in the fifth insertion groove 807, and a fifth side positioning hole 805 corresponding to the fifth side positioning pin 904 is opened on the connecting block.

[0081] Optionally, the cross-section of the anti-theft end face of the fifth insertion part 9 is a straight line.

[0082] Optionally, the fifth core 8 is provided with several fifth locking channels 804. The fifth locking channels 804 are connected to the fifth locking channels 801, and the fifth locking channels 804 are used to accommodate the locking pins of the anti-theft lock.

[0083] Optionally, the position of the central axis of the fifth locking channel 804 does not correspond to that of the fifth chip removal groove 803.

[0084] In this embodiment, the fifth insertion slot 807 penetrates the outer periphery of the fifth core 8 to form two slots located on the side. The advantage is that it can take into account both the area of ​​the fifth insertion part 9 covering the fifth outer end face 802 and the difficulty of installation.

[0085] Example 6

[0086] See appendix Figure 19 And refer to the appendix Figures 1-6The lock cylinder for preventing destructive unlocking shown in this invention differs from the first embodiment only in the position of the insertion slot. It includes a sixth core 10, within which a sixth locking channel 1001 for key insertion is formed. The sixth locking channel 1001 penetrates the sixth outer end face 1002 of the sixth core 10. A sixth insertion slot 1005 for accommodating the insertion part is also provided within the sixth core 10. The sixth insertion slot 1005 penetrates the outer periphery of the sixth core 10 to form a lower slot for the insertion of the sixth insertion part. The sixth insertion slot 1005 is located between the sixth inner end face 1004 and the sixth chip removal groove 1003.

[0087] In other embodiments, two or more insertion slots may be provided within the core, for example, one insertion slot may be located between the inner end face and the chip removal slot, and another insertion slot may be located between the outer end face and the chip removal slot. Providing two or more insertion slots is equivalent to providing one insertion slot.

Claims

1. A lock cylinder resistant to destructive unlocking, characterized in that: The device includes a core, within which a locking channel for key insertion is formed. The locking channel penetrates the outer end face of the core. The core also contains several insertion slots for accommodating insertion parts. Insertion parts with a hardness higher than that of the core are placed in the insertion slots. The insertion parts have internally formed grooves. When the insertion part is located in an insertion slot, the width of the groove is greater than or equal to the width of the corresponding locking channel.

2. The lock cylinder against destructive unlocking according to claim 1, characterized in that: When the insertion part is located in the insertion groove, the insertion part and the insertion groove are either interference fit or clearance fit.

3. The lock cylinder resistant to destructive unlocking according to claim 1, characterized in that: When the insertion part is located in the insertion slot, the insertion part and the insertion slot are detachably connected.

4. The lock cylinder resistant to destructive unlocking according to claim 1, characterized in that: The hardness of the insertion part is 50HRC to 80HRC.

5. The lock cylinder resistant to destructive unlocking according to claim 1, characterized in that: The core is provided with several chip removal grooves.

6. The lock cylinder resistant to destructive unlocking according to claim 5, characterized in that: The insertion slot is located between the outer end face and the chip removal slot.

7. The lock cylinder resistant to destructive unlocking according to claim 1, characterized in that: The top of the insertion part is provided with several top positioning pins, and the core body is provided with top positioning holes corresponding to the top positioning pins.

8. The lock cylinder resistant to destructive unlocking according to claim 1, characterized in that: The insertion section includes several independent inserts.

9. The lock cylinder resistant to destructive unlocking according to claim 1, characterized in that: The insert is provided with a side positioning pin on its side, and the core is provided with a side positioning hole corresponding to the side positioning pin.

10. The lock cylinder resistant to destructive unlocking according to claim 1, characterized in that: The cross-section of the anti-theft end face of the insertion part is a straight line, an arc, or a combination thereof.

11. The lock cylinder resistant to destructive unlocking according to claim 5, characterized in that: The insertion slot is located between the inner end face and the chip removal slot.

12. The lock cylinder resistant to destructive unlocking according to claim 1, characterized in that: The core is provided with several locking channels.

13. The lock cylinder resistant to destructive unlocking according to claim 12, characterized in that: The core is provided with several chip removal grooves, and the position of the central axis of the locking channel does not correspond to the chip removal grooves.

14. The lock cylinder resistant to destructive unlocking according to claim 1, characterized in that: The insertion groove penetrates the outer periphery of the core to form at least one slot for insertion of the insertion part.

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