Mechanical anti-theft lock cylinder

Abstract

The invention discloses a mechanical anti-theft lock cylinder which comprises a lock shell and a rotatable lock cylinder body arranged in the lock shell, an unlocking shifting fork is arranged on the lock shell, a main lock part of a marble structure is arranged on the lock shell, an empty groove is formed in the lock shell, and a cover plate covers the empty groove. Raw materials are greatly saved, the machining cost is greatly reduced by 15% or above, and production and manufacturing are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of locks, and in particular to a mechanical anti-theft lock core. Background Art

[0002] It is known that although the appearances of various existing mechanical lock cylinders vary greatly, ordinary pin lock cylinders have a simple structure and a high market share. They are generally composed of a lock shell, a lock core body, a key and other components, supplemented by pins and pin springs of varying lengths, which together form the locking and opening functions of the lock core. In the locked state, the lower pins in the pin holes are all lower than the surface of the lock core body under the elastic force of the pin springs, half of the upper pins enter the lock shell, and the other half remain in the lock core body. At this time, the lock core body cannot rotate. When the key is inserted, the key teeth of different heights on the key overcome the elastic force of the pin spring and squeeze the lower pins, causing the lower pins to move upward at different heights, causing the tails of all the lower pins to be flush with the surface of the lock core body, and all the upper pins are discharged from the lock core body. The lock core body can rotate freely relative to the lock core body under the drive of the key, and the lock core can be opened. When this type of lock core was first introduced to the market, the anti-theft performance was good because there were no special tools for opening the lock core because the pins were distributed along the circumference and there were more of them. However, after years of use, special tools for opening the lock core appeared on the market, and the anti-theft performance continued to decline over time.

[0003] Therefore, after continuous development, a blade anti-theft lock core has emerged (such as a mechanical anti-theft lock core disclosed in the Chinese utility model patent with authorization announcement number CN207092722U). The existing blade anti-theft lock core includes a lock housing, a lock core body and a key. The lock core body can be rotatably arranged in the lock housing, and a key insertion hole is arranged on the lock core body. The lock core body is provided with a plurality of blade grooves that cross the key insertion hole, and the first blade, the second blade or the third blade and so on are arranged in the blade groove in sequence; the upper part of the first blade is provided with a blade notch, and the upper part of the second blade is provided with a blade notch. A spring positioning seat is provided at the lower part of a blade, and a right tooth or a right middle tooth is provided on the key insertion hole; a blade notch is provided at the upper part of the third blade, and a middle tooth is provided in the key insertion hole; a blade notch is provided at the upper part of the second blade, a spring positioning seat is provided at the lower part of the second blade, and a left tooth or a left middle tooth is provided in the key insertion hole; a locking plate notch parallel to the key insertion hole is provided on the lock core body and the lock shell body, and a locking plate is provided on the locking plate notch, the upper part of the locking plate corresponds to the locking plate notch of the lock shell body, and the lower part of the locking plate matches the blade notches on all blades. The existing locks are all made of copper materials, which are expensive, greatly increase the cost investment, and are not conducive to mass production. Therefore, it is urgent to improve the existing technology. Summary of the invention

[0004] 1. Technical issues that need to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a mechanical anti-theft lock core, which greatly saves raw materials, reduces the processing cost by more than 15%, and is conducive to production and manufacturing.

[0006] (II) Technical solutions to be adopted

[0007] To achieve the above object, the technical solutions adopted by the present invention are as follows:

[0008] A mechanical anti-theft lock core includes a lock housing and a rotatable lock core body disposed inside the lock housing. An unlocking fork is provided on the lock housing, a main lock portion with a ball structure is provided on the lock housing, an empty slot is opened on the lock housing, and the empty slot is covered with a cover plate.

[0009] A further solution is that the empty slot is located on one side of the lock housing away from the lock core body in the width direction of the lock housing, and the empty slot is covered with a cover plate.

[0010] A further solution is that the lock core body includes a front lock core and a rear lock core rotatably disposed in the lock housing. A front insertion hole for inserting a key is provided on the front lock core, a secondary advanced mechanism is provided on the rear lock core. The secondary advanced mechanism includes an inner cylinder rotatable inside the rear lock core, a rear insertion hole for inserting a key is provided on the inner cylinder, a secondary lock portion with a ball structure is provided on the rear lock core and the inner cylinder, the secondary lock portion cooperates with the main lock portion, and after the front lock core is unlocked, the rear lock core is driven by the inner cylinder to unlock the unlocking fork.

[0011] A further solution is that the main lock portion includes at least one T-shaped ball and a special-shaped ball provided on the lock housing. Anti-prying heads are provided on both the T-shaped ball and the special-shaped ball, a spring contacts the upper end surface of the anti-prying head, and a sealing bead contacts the spring.

[0012] A further solution is that the secondary lock portion includes fixing holes provided on the rear lock core and the inner cylinder. The number of fixing holes on the rear lock core is the same as that on the inner cylinder. After the inner cylinder rotates in the rear lock core, the corresponding T-shaped balls drop and are stuck in the fixing holes on the rear lock core and the inner cylinder.

[0013] A further solution is that the front lock core has a card hole for the T-shaped ball and the special-shaped ball to be inserted. After the front lock core is rotated, the T-shaped ball and the special-shaped ball fall into the card hole to limit the rotation of the front lock core.

[0014] A further solution is as follows: the number of fixing holes on the rear lock core and the inner liner is three each, the number of clamping holes on the front lock core is four, the number of T-shaped pins is six, the number of special-shaped pins is one, and the number of anti-prying heads, springs and sealing beads is seven each.

[0015] A further solution is as follows: the lower end surface of the anti-prying head is horizontally arranged.

[0016] A further solution is as follows: the special-shaped pin includes an upper head portion and a lower portion provided on the lower end surface of the upper head portion, and a groove is formed on the upper head portion. The diameter of the upper head portion is larger than that of the lower portion, the lower portion is in a cylindrical shape, and the upper head portion and the lower portion are integrally formed.

[0017] A further solution is as follows: a bottom conical portion is provided on the lower surface of the lower portion, and the upper head portion, the lower portion and the bottom conical portion are integrally formed.

[0018] A further solution is as follows: a front clamping piece and a rear clamping piece are provided on the lock housing. Correspondingly, a front clamping groove is provided on the front lock core of the clamping hole that cooperates with the special-shaped pin. The front clamping groove cooperates with the front clamping piece, and a rear clamping groove is provided on the rear lock core. The rear clamping groove cooperates with the rear clamping piece.

[0019] A further solution is as follows: the front clamping groove and the rear clamping groove are arc-shaped.

[0020] A further solution is as follows: a core hole for installing the lock core body is provided on the lock housing, and the front clamping piece and the rear clamping piece are provided on the core hole. The front clamping piece and the rear clamping piece cooperate with the corresponding front clamping groove and rear clamping groove.

[0021] A further solution is as follows: a V-shaped notch is provided on the core hole.

[0022] A further solution is as follows: a tail groove is provided on the rear lock core, and the tail groove cooperates with the unlocking fork.

[0023] A further solution is as follows: symmetrically distributed tooth patterns are provided on the key.

[0024] A further solution is as follows: the open ends of the front insertion hole and the rear insertion hole are arranged in different directions in the lock housing.

[0025] A further solution is as follows: the lock housing and the lock core body are made of copper material.

[0026] (III) Technical effects to be achieved

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] First, a main lock part with a cylinder structure is provided on the lock housing of the present invention. An empty slot is opened on the lock housing, and the empty slot is covered with a cover plate, which greatly saves raw materials and reduces the processing cost by more than 15%, facilitating production and manufacturing.

[0029] Second, the lock core body of the present invention includes a front lock core and a rear lock core that are rotatably arranged in the lock housing. A front insertion hole for inserting a key is provided on the front lock core, and a secondary advancement mechanism is provided on the rear lock core. The secondary advancement mechanism includes an inner cylinder that is rotatable inside the rear lock core. A rear insertion hole for inserting a key is provided on the inner cylinder. A secondary lock part with a cylinder structure is provided on the rear lock core and the inner cylinder. The secondary lock part cooperates with the main lock part. After the front lock core is unlocked, the rear lock core is driven by the inner cylinder to unlock the unlocking fork. It not only improves the anti-theft effect by setting a secondary advancement insertion structure for the key, but also the independent idle rotation of the inner cylinder in the rear lock core perfectly avoids the higher-level unlocking ability of power tools and unlocking tools, making the present invention have a higher anti-theft technology and being more conducive to meeting the safety needs of users.

[0030] Third, the secondary lock part of the present invention includes fixing holes provided on the rear lock core and the inner cylinder. The number of fixing holes on the rear lock core is the same as that on the inner cylinder. After the inner cylinder rotates in the rear lock core, the corresponding T-shaped cylinders fall into and are stuck in the fixing holes on the rear lock core and the inner cylinder. A clamping hole for the T-shaped cylinder and the special-shaped cylinder to be inserted is provided on the front lock core. After the front lock core is rotated, the T-shaped cylinder and the special-shaped cylinder fall into the clamping hole to restrict the rotation of the front lock core. In this way, the inner cylinder in the rear lock core can independently idle rotate, perfectly avoiding the higher-level unlocking ability of power tools and unlocking tools, making the present invention have a higher anti-theft technology unlocking ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic exploded structure diagram of the present invention.

[0032] Figure 2 It is a schematic structure diagram of the lock housing of the present invention.

[0033] Figure 3 It is a schematic structure diagram of the front lock core of the present invention.

[0034] Figure 4 It is a schematic structure diagram of the rear lock core of the present invention.

[0035] Figure 5 It is a schematic structure diagram of the inner cylinder of the present invention.

[0036] Figure 6 It is a schematic structure diagram of the special-shaped cylinder of the present invention.

[0037] Figure 7 It is a schematic structure diagram of the unlocking fork of the present invention.

[0038] Figure 8 This is a schematic structural diagram of the key of the present invention.

[0039] Figure 9 This is a schematic structural diagram of the cover plate of the present invention.

[0040] In the figure: 1, lock housing; 2, lock core body; 3, unlocking fork; 4, main lock part; 5, key; 11, front clamping piece; 12, rear clamping piece; 13, core hole; 14, empty groove; 15, cover plate; 21, front lock core; 22, rear lock core; 23, front jack; 24, secondary advanced mechanism; 41, T-shaped ball; 42, special-shaped ball; 43, anti-pry head; 44, spring; 45, sealing bead; 51, side row tooth pattern one; 52, side row tooth pattern two; 131, V-shaped notch; 211, front card slot; 221, rear card slot; 241, inner liner; 242, rear jack; 243, secondary lock part; 421, upper head; 422, lower part; 423, groove; 424, bottom conical part. Detailed implementation manners

[0041] In the description of the present invention, it should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0042] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined. "Several" means one or more, unless otherwise specifically defined.

[0043] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and defined, the terms "set", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the scope of the present invention. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0045] Embodiment 1: Refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 A mechanical anti-theft lock core includes a lock housing 1 and a rotatable lock core body 2 disposed inside the lock housing 1. As shown in Figure 7 , an unlocking fork 3 is provided on the lock housing 1, and a main lock part 4 with a ball structure is provided on the lock housing 1. As shown in Figure 9 , the lock housing 1 and the lock core body 2 are made of copper material. An empty groove 14 is opened on the lock housing 1. By means of the empty groove 14, the material of the lock housing 1 is greatly saved, and the material-saving processing reduces the cost by more than 15%. It is more conducive to meeting the requirements of production enterprises for cost reduction. The empty groove 14 is located on the side of the lock housing 1 away from the lock core body 2 in the width direction. The position of such an empty groove 14 can only be on one side of the main lock part 4 on the lock housing 1. At other positions, it will affect the lock core body 2 and make it impossible to open such an empty groove 14. In the present invention, the empty groove 14 can form a material-saving groove, which is more conducive to meeting the production requirements of production enterprises. A cover plate 15 is covered on the empty groove 14. The cover plate 15 adopts a hard structure (thickened or reinforced plate or reinforcing rib), which improves the structural firmness, is also beneficial to the explosion-proof effect on the lock housing 1, and is also beneficial to improving the service durability. It should be noted that a mark is provided on the cover plate 15, which is beneficial to improving the warning effect and also convenient for users to see clearly in time.

[0046] Embodiment 2: It can be described on the basis of Embodiment 1. As shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown, the lock core body 2 includes a front lock core 21 and a rear lock core 22 that are rotatably arranged in the lock housing 1. A front insertion hole 23 for inserting the key 5 is provided on the front lock core 21, and a secondary advancement mechanism 24 is provided on the rear lock core 22. The secondary advancement mechanism 24 includes an inner liner 241 that is rotatable inside the rear lock core 22. A rear insertion hole 242 for inserting the key 5 is provided on the inner liner 241. A secondary lock part 243 with a pin tumbler structure is provided on the rear lock core 22 and the inner liner 241. The secondary lock part 243 cooperates with the main lock part 4. After the front lock core 21 is unlocked, the rear lock core 22 is driven by the inner liner 241 to unlock the unlocking fork 3. The independent idle rotation of the inner liner 241 in the rear lock core 22 perfectly avoids the higher-level unlocking ability of power tools and unlocking tools, making the present invention have a higher anti-theft technology and being more conducive to meeting the safety needs of users.

[0047] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , the main lock part 4 includes at least one T-shaped pin 41 and a special-shaped pin 42 provided on the lock housing 1. Anti-prying heads 43 are provided on both the T-shaped pin 41 and the special-shaped pin 42. The upper end surface of the anti-prying head 43 contacts a spring 44, and a sealing bead 45 contacts the spring 44. The unlocking and locking principle of the main lock part 4 is prior art and will not be elaborated in detail here; the secondary lock part 243 includes fixing holes provided on the rear lock core 22 and the inner liner 241. The number of fixing holes on the rear lock core 22 is the same as that on the inner liner 241. After the inner liner 241 rotates in the rear lock core 22, the corresponding T-shaped pin 41 drops into and is stuck in the fixing holes on the rear lock core 22 and the inner liner 241; the locking holes on the front lock core 21 for the T-shaped pin 41 and the special-shaped pin 42 to be inserted into. After the front lock core 21 is rotated, the T-shaped pin 41 and the special-shaped pin 42 fall into the locking holes to limit the rotation of the front lock core 21. In this embodiment, the number of fixing holes on the rear lock core 22 and the inner liner 241 is three, the locking holes on the front lock core 21 are four, the T-shaped pins 41 are six, the special-shaped pins 42 are one, and the anti-prying heads 43, springs 44, and sealing beads 45 are all seven. It should be noted that the lower end surface of the anti-prying head 43 is horizontally arranged, which is more conducive to contacting the upper end surfaces of the T-shaped pin 41 and the special-shaped pin 42, increasing the contact area and being more conducive to pushing the T-shaped pin 41 and the special-shaped pin 42 to move downward. It should also be noted that as Figure 6As shown, the special-shaped ball 42 includes an upper head 421 and a lower part 422 provided on the lower end surface of the upper head 421. A groove 423 is formed on the upper head 421. The diameter of the upper head 421 is larger than that of the lower part 422. The lower part 422 is cylindrical. The upper head 421 and the lower part 422 are integrally formed, greatly improving the structural firmness. It should also be noted that a bottom conical part 424 is provided on the lower surface of the lower part 422. The upper head 421, the lower part 422, and the bottom conical part 424 are integrally formed. This setting is more reasonable and more conducive to use.

[0048] Among them, as Figure 1 and Figure 2 shown, a front clamping piece 11 and a rear clamping piece 12 are provided on the lock housing 1. Correspondingly, as Figure 3 shown, a front clamping groove 211 is provided on the front lock core 21 of the clamping hole that cooperates with the special-shaped ball 42. The front clamping groove 211 cooperates with the front clamping piece 11. As Figure 4 shown, a rear clamping groove 221 is provided on the rear lock core 22. The rear clamping groove 221 cooperates with the rear clamping piece 12. It should be noted that, as Figure 1 , Figure 3 and Figure 4 shown, the front clamping groove 211 and the rear clamping groove 221 are arc-shaped. It should also be noted that the lock housing 1 is provided with a core hole 13 for installing the lock core body 2. The front clamping piece 11 and the rear clamping piece 12 are provided on the core hole 13. The front clamping piece 11 and the rear clamping piece 12 cooperate with the corresponding front clamping groove 211 and rear clamping groove 221. This is conducive to fixing the front lock core 21 and the rear lock core 22 through the clamping piece 11 and the rear clamping piece 12, enabling the lock core body 2 to rotate within the lock housing 1. Finally, it should be noted that the clamping piece 11 and the rear clamping piece 12 are of special shapes, making the use safer and more reliable. For the core hole 13 in this embodiment, a V-shaped notch 131 is provided. This setting is reasonable and convenient for normal use.

[0049] Among them, as Figure 1 and Figure 4 shown, a tail groove is provided on the rear lock core 22. The tail groove cooperates with the unlocking fork 3. The tail groove can drive the unlocking fork 3 to open the door lock. Rotating the lock core body 2 with the key 5 to drive the unlocking fork 3 can achieve the unlocking function.

[0050] Embodiment 3: It can be described on the basis of Embodiment 2. As Figure 1 and Figure 8As shown, the key 5 is provided with symmetrically distributed serrations. In this embodiment, the symmetrically distributed serrations are side row serrations one 51 (left row serrations in this embodiment) and side row serrations two 52 (right row serrations in this embodiment). The key serrations are symmetrical. When the key 5 is inserted into the rear jack 242 in the inner liner 241 of the lock cylinder 22 for the second time, the left row serrations of the key 5 will cooperate with the T-shaped pin 41, making the T-shaped pin 41 form a cross-section on the surface of the rear lock cylinder 22. At this time, the key 5 will drive the inner liner 241 and the rear lock cylinder 22 to rotate together, thereby driving the unlocking fork 3 to open the door lock. Since there is a tail groove on the rear lock cylinder 22, the unlocking fork 3 can be driven to open the door lock through the tail groove, while the inner liner 241 does not have it. However, the inner liner 241 is embedded in the rear lock cylinder 22. If the key 5 is inserted into the inner liner 241 of the rear lock cylinder 22, making the cross-section of the T-shaped pin 41 on the inner liner 241 of the rear lock cylinder 22, at this time, the key 5 can drive the front lock cylinder 21 and the inner liner 241, but cannot drive the rear lock cylinder 22, thus unable to drive the unlocking fork 3 to open the door lock.

[0051] Embodiment 4: It can be described based on Embodiment 1 or Embodiment 2 or Embodiment 3. As Figure 1 shown, the open ends of the front jack 23 and the rear jack 242 are arranged in different directions in the lock housing 1. The front jack 23 is a right-side type jack, and the rear jack 242 is a left-side type jack. When in use, first insert the key 5 into the front jack 23 of the right-side type jack of the front lock cylinder 21. Then when the key 5 can be rotated 45 degrees to the left or 135 degrees in the reverse direction, then the key 5 can be inserted into the rear jack 242 of the left-side type jack in the inner liner 241 of the rear lock cylinder 22 for the second time. Otherwise, it cannot be done.

[0052] Embodiment 5: It can be described based on Embodiment 1 or Embodiment 2 or Embodiment 3 or Embodiment 4. As Figure 1 shown, the front lock cylinder 21 and the rear lock cylinder 22 are coaxially distributed inside the lock housing 1. This kind of setting is reasonable and convenient for the normal operation and use in the later stage.

[0053] As Figure 1As shown in the figure, when the key 5 is inserted into the front jack 23 of the front lock cylinder 21 in the present invention, the key 5 can only enter half of the lock cylinder body 2. The side row teeth pattern two 52 of the key 5 (the right row teeth pattern in this embodiment) cooperates with the T-shaped pin 41 and the special-shaped pin 42. When the side row teeth pattern two 52 (the right row teeth pattern in this embodiment) matches, the front lock cylinder 21 will form a cross-section with the T-shaped pin 41 and the special-shaped pin 42, so that the front lock cylinder 21 can rotate. When the front lock cylinder 21 rotates 45 degrees to the left or 135 degrees in the reverse direction, the key 5 can be inserted into the rear jack 242 on the inner liner 241 of the rear lock cylinder 22 for the second time, otherwise it cannot; because there are symmetrically distributed teeth patterns on the key 5, and in this embodiment, the symmetrically distributed teeth patterns are the side row teeth pattern one 51 (the left row teeth pattern in this embodiment) and the side row teeth pattern two 52 (the right row teeth pattern in this embodiment). The key teeth pattern is symmetrical. When the key 5 is inserted into the rear jack 242 in the inner liner 241 of the rear lock cylinder 22 for the second time, the left row teeth pattern of the key 5 will cooperate with the T-shaped pin 41, making the T-shaped pin 41 form a cross-section on the surface of the rear lock cylinder 22. At this time, the key 5 will drive the inner liner 241 and the rear lock cylinder 22 to rotate together, thus driving the unlocking fork 3 to open the door lock. Since there is a tail groove on the rear lock cylinder 22, the unlocking fork 3 can be driven to open the door lock through the tail groove, while the inner liner 241 does not have it. However, the inner liner 241 is embedded in the rear lock cylinder 22. If the key 5 is inserted into the inner liner 241 of the rear lock cylinder 22, making the cross-section of the T-shaped pin 41 on the inner liner 241 of the rear lock cylinder 22, at this time the key 5 can drive the front lock cylinder 21 and the inner liner 241, but cannot drive the rear lock cylinder 22, thus unable to drive the unlocking fork 3 to open the door lock. The present invention unlocks by setting the secondary advanced insertion method of the key 5, and the independent idle rotation of the inner liner 241 in the rear lock cylinder 22 perfectly avoids the higher-level unlocking ability of power tools and unlocking tools, making the present invention have a higher anti-theft effect and being more conducive to meeting the safe use needs of users.

[0054] The standard parts used in this application document can all be purchased from the market. The specific connection methods of each part all adopt conventional means such as mature bolts and rivets in the prior art, and no specific description will be made here.

[0055] It should be noted that although the above-mentioned embodiments have been described in this article, the patent protection scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, the changes and modifications made to the embodiments described in this article, or the equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present invention, directly or indirectly applying the above technical solutions to other related technical fields, are all included in the protection scope of the present invention patent.

Claims

1. A mechanical anti-theft lock core, comprising a lock housing (1) and a rotatable lock core body (2) disposed inside the lock housing (1), an unlocking fork (3) is provided on the lock housing (1), and a main lock portion (4) with a ball structure is provided on the lock housing (1), characterized in that: An empty groove (14) is formed on the lock housing (1).

2. The second-order mechanical anti-theft lock core according to claim 1, characterized in that: The empty groove (14) is located on one side of the lock housing (1) away from the lock core body (2) in the width direction of the lock housing (1), and a cover plate (15) is covered on the empty groove (14).

3. The two-stage mechanical anti-theft lock core according to claim 1 or 2, characterized in that: The lock core body (2) includes a front lock core (21) and a rear lock core (22) rotatably arranged in the lock housing (1). A front jack (23) for inserting a key (5) is arranged on the front lock core (21). A secondary advancement mechanism (24) is arranged on the rear lock core (22). The secondary advancement mechanism (24) includes an inner cylinder (241) rotatable inside the rear lock core (22). A rear jack (242) for inserting a key (5) is arranged on the inner cylinder (241). A secondary lock part (243) with a ball structure is arranged on the rear lock core (22) and the inner cylinder (241). The secondary lock part (243) cooperates with the main lock part (4). After the front lock core (21) is unlocked, the rear lock core (22) is driven by the inner cylinder (241) to unlock the unlocking fork (3).

4. The two-step mechanical anti-theft lock core according to claim 3, wherein: The main lock part (4) includes at least one T-shaped ball (41) and a special-shaped ball (42) arranged on the lock housing (1). Anti-prying heads (43) are arranged on both the T-shaped ball (41) and the special-shaped ball (42). The upper end surface of the anti-prying head (43) contacts a spring (44), and a sealing bead (45) contacts the spring (44).

5. The two-step mechanical anti-theft lock core according to claim 4, characterized in that: The secondary lock part (243) includes fixing holes arranged on the rear lock core (22) and the inner cylinder (241). The number of fixing holes on the rear lock core (22) is the same as that on the inner cylinder (241). After the inner cylinder (241) rotates in the rear lock core (22), the corresponding T-shaped ball (41) drops and is stuck in the fixing holes on the rear lock core (22) and the inner cylinder (241).

6. The two-stage mechanical anti-theft lock core according to claim 4 or 5, characterized in that: A jack for the T-shaped ball (41) and the special-shaped ball (42) to be inserted is arranged on the front lock core (21). After the front lock core (21) is rotated, the T-shaped ball (41) and the special-shaped ball (42) fall into the jack to limit the rotation of the front lock core (21).

7. The two-stage mechanical anti-theft lock core according to claim 4 or 5, characterized in that: The lower end surface of the anti-prying head (43) is arranged horizontally.

8. The two-stage mechanical anti-theft lock core according to claim 4 or 5, characterized in that: The special-shaped ball (42) includes an upper head (421) and a lower part (422) arranged on the lower end surface of the upper head (421). A groove (423) is formed on the upper head (421). The diameter of the upper head (421) is larger than that of the lower part (422). The lower part (422) is cylindrical, and the upper head (421) and the lower part (422) are integrally formed.

9. The two-stage mechanical anti-theft lock core according to claim 4 or 5, characterized in that: The lock housing (1) is provided with a front clamping piece (11) and a rear clamping piece (12). Correspondingly, a front clamping groove (211) is provided on the front lock core (21) of the clamping hole that cooperates with the special-shaped pin (42). The front clamping groove (211) cooperates with the front clamping piece (11). A rear clamping groove (221) is provided on the rear lock core (22), and the rear clamping groove (221) cooperates with the rear clamping piece (12).

10. The two-stage mechanical anti-theft lock core according to claim 1 or 2 or 4 or 5, characterized in that: The lock housing (1) is provided with a core hole (13) for installing the lock core body (2). The front clamping piece (11) and the rear clamping piece (12) are provided on the core hole (13). The front clamping piece (11) and the rear clamping piece (12) cooperate with the corresponding front clamping groove (211) and rear clamping groove (221).

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