A temporary password lock with retrievable password
Patent Information
- Application Number
- CN202522577431.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-04
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2035-12-04
AI Technical Summary
但是现有的密码锁在使用时，使用者可能由于长时间不使用，而忘记密码锁的密码
与现有技术相比，该一种可找回密码的临时密码锁通过钥匙转动旋转座以及设置在旋转座底端的拨动杆转动，随后通过转动的拨动杆在固定块上开设的滑槽内滑动，将固定块以及设置在固定块一端的移动座、第二弧形片朝向左侧推动，接着通过被推动的第二弧形片，使得设置在第二弧形片上的斜面顶起块推动至第一弧形片下方，随后第一弧形片受到斜面顶起块挤压，推动卡条上移，此时上移的卡条紧紧挤压在固定座外侧壁，当需要对密码进行找回时，通过转动块转动限位座以及与限位座固定连接的固定座转动，当固定座外侧壁的卡槽转动至卡条正上方时，卡条会挤压卡合进卡槽内，接着固定座、限位座、转动块均无法转动，此时转动块上的数字就为找回的正确密码，该结构的设置可以对忘记的密码进行找回，避免由于使用者忘记密码而无法开锁或产生暴力开锁的困扰，提高装置的实用性。
Smart Images
Figure CN224919018U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of combination lock technology, and more specifically, to a temporary combination lock with a recoverable password. Background Technology
[0002] A combination lock includes a roller with a string of numbers on it. The lock can only be opened when the roller is turned to the set number position. However, with existing combination locks, users may forget the combination if they haven't used it for a long time. When the combination is forgotten, users often resort to brute force to unlock the lock, affecting the device's practicality.
[0003] Therefore, a temporary password lock with recoverable password is proposed to address the above problems. Utility Model Content
[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a temporary combination lock with recoverable password to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a temporary combination lock with recoverable password, comprising a rotating base, a lock cylinder, a connecting rod, a spring, a limiting block, a rotating block, a limiting seat, a limiting groove, a fixed seat, a slot, a lower base, and an upper base. The rotating block is internally connected to the limiting seat, and a fixed seat is fixedly mounted at one end of the limiting seat. A slot is formed on the outer wall of the fixed seat. Two connecting strips are fixedly mounted on the lower base, and three first arc-shaped pieces are fixedly connected between the two connecting strips. A slot is fixedly mounted on the upper surface of each of the three first arc-shaped pieces. A movable base is slidably connected below the lower base, and three second arc-shaped pieces are fixedly mounted on the movable base. A sloping lifting block is fixedly mounted on the upper surface of each of the three second arc-shaped pieces. A movable component is provided at one end of the movable base. During use, [the lock is opened / opened]. The component drives the moving base and pushes the second arc-shaped piece to the left. Then, the pushed second arc-shaped piece pushes the inclined lifting block on the second arc-shaped piece to below the first arc-shaped piece. Subsequently, the first arc-shaped piece is squeezed by the inclined lifting block, pushing the locking strip upward. At this time, the upward-moving locking strip is tightly pressed against the outer wall of the fixed base. When the password needs to be retrieved, the rotating block rotates the limiting base and the fixed base fixedly connected to the limiting base. When the slot on the outer wall of the fixed base rotates to directly above the locking strip, the locking strip will be squeezed and locked into the slot. Then, the fixed base, the limiting base, and the rotating block can no longer rotate. At this time, the number on the rotating block is the retrieved correct password. This structure can retrieve forgotten passwords, avoiding the trouble of being unable to unlock the door due to forgetting the password or the need for forced unlocking, thus improving the practicality of the device.
[0006] Preferably, the inner wall of the limiting seat has a limiting groove, and a connecting rod is movably inserted at the central axis of the limiting seat. One end of the connecting rod is fixedly connected to a lock cylinder, and a spring is sleeved and connected to the outer wall of the connecting rod. Three limiting blocks are fixedly connected at equal intervals on the outer wall of the connecting rod, located on one side of the spring, and the limiting blocks are adapted to the limiting groove. A rectangular block is connected to the end of the connecting rod away from the lock cylinder. When the lock can be unlocked, the three limiting grooves on the inner wall of the limiting seat are all located at the bottom end, and the lock cylinder, connecting rod, and limiting... When the block moves to the right, the three limit blocks can smoothly move through the limit grooves. If the lock cannot be unlocked, the password numbers on the three rotating blocks are incorrect. Because the rotating blocks are in the wrong position, the limit seat rotates at the wrong angle. At this time, the limit groove on the inner wall of the limit seat is not at the bottom. Therefore, when the rotating seat is rotated, the limit block on the connecting rod is blocked by the limit seat. There is no limit groove for the limit block to pass through, the lock cylinder cannot move to the right, and the rotating seat cannot rotate smoothly, ultimately making it impossible to unlock.
[0007] Preferably, the moving component includes a key, a fixing block, a sliding groove, a rotating seat, an insertion groove, and a lever. The rotating seat is rotatably connected to the lower base, and the rotating seat has an insertion groove. The key is inserted into the insertion groove. The lever is fixedly mounted on the bottom wall of the rotating seat and passes through the surface of the lower base. The fixing block is fixedly connected to one end of the moving seat, and the fixing block has a sliding groove. The lever is slidably connected in the sliding groove. In use, the key is inserted into the insertion groove at the top of the rotating seat, and then the lever is rotated by the key. The rotating lever then moves the fixing block and the moving seat at one end of the fixing block to the left. At this time, the moving seat drives the second arc-shaped piece and the inclined lifting block to move. Then, the first arc-shaped piece is squeezed by the inclined lifting block, pushing the locking strip upward.
[0008] Preferably, a rotating seat is rotatably connected to the upper base. The outer wall of the rotating seat has a locking notch, and the outer wall of the rotating seat, located on one side of the locking notch, has an unlocking notch. A rotating knob for rotating the rotating seat is limited and connected to the top of the rotating seat. A connecting seat is engaged with the bottom wall of the rotating seat. A stop block is fixedly provided on the outer wall of the bottom end of the connecting seat. In use, the rotating seat, the connecting seat and the stop block located at the bottom of the rotating seat are rotated by rotating the knob. Then, the rotating stop block extends out of the lower base and the upper base, which is the locked state. At this time, the stop block is perpendicular to the lower base and the upper base. When the stop block rotates to be parallel to the lower base and the upper base, it is the unlocked state.
[0009] Preferably, the inner sidewall of the rotating block is provided with a locking groove, and the outer sidewall of the limiting seat is fixedly connected with a locking protrusion that is engaged with the locking groove. The rotating block and the limiting seat are connected by the engagement between the locking protrusion and the locking groove to achieve a limiting connection.
[0010] Preferably, three elastic pieces are provided between the two connecting strips, and one end of each of the three elastic pieces is fixedly connected to a connecting strip. The three elastic pieces are located directly below the three rotating blocks. When the rotating blocks rotate, the elastic pieces will contact and collide with the outer wall surface of the rotating blocks, so that the rotating blocks emit sound through the contact between the elastic pieces and the outer wall of the rotating blocks when they rotate.
[0011] The technical effects and advantages of this utility model are as follows: Compared with existing technologies, this temporary combination lock with recoverable passwords rotates by a key rotating a base and a lever located at the bottom of the base. The rotating lever then slides within a groove on a fixed block, pushing the fixed block, a movable base at one end of the fixed block, and a second arc-shaped piece towards the left. The pushed second arc-shaped piece then pushes a sloping lifting block located on it below the first arc-shaped piece. The first arc-shaped piece is then pressed by the sloping lifting block, pushing the locking bar upwards. The upward-moving locking bar... The device is tightly pressed against the outer wall of the fixed base. When the password needs to be retrieved, the rotating block rotates the limiting seat and the fixed base fixedly connected to the limiting seat. When the slot on the outer wall of the fixed base rotates to directly above the card strip, the card strip will be squeezed and locked into the slot. Then, the fixed base, the limiting seat, and the rotating block can no longer rotate. At this time, the number on the rotating block is the correct password that has been retrieved. This structure can retrieve forgotten passwords, avoiding the trouble of being unable to unlock the door due to forgetting the password or the need for forced unlocking, thus improving the practicality of the device. Attached Figure Description
[0012] Figure 1 This is a frontal three-dimensional structural diagram of the present invention.
[0013] Figure 2 This is a three-dimensional structural diagram of the disassembled rotary knob and key of this utility model.
[0014] Figure 3 This is a schematic diagram of the disassembled three-dimensional structure of the lower base and upper base of this utility model.
[0015] Figure 4 This is a three-dimensional structural diagram of the connecting strip of this utility model.
[0016] Figure 5 This is a three-dimensional structural diagram of the rotating block of this utility model.
[0017] Figure 6 This is a schematic diagram of the disassembled structure of the rotating block, connecting strip, and moving seat of this utility model.
[0018] Figure 7 This is a schematic diagram of the lock cylinder and connecting rod structure of this utility model.
[0019] Figure 8 This is a three-dimensional structural diagram of the inner wall of the rotating block of this utility model.
[0020] Figure 9 This is a schematic diagram of the planar structure of the rotating block and the limiting seat when the password can be modified according to this utility model.
[0021] Figure 10 This is a schematic diagram of the planar structure of the rotating block and the limiting seat when the password cannot be modified according to this utility model.
[0022] Figure 11 This is a schematic diagram of the planar structure of the rotating block of this utility model.
[0023] Figure 12 This is a schematic diagram of the structure of the protruding top block of this utility model.
[0024] The attached diagram is labeled as follows: 1. Rotating knob; 2. Key; 3. Rotating seat; 4. Locking notch; 5. Unlocking notch; 6. Connecting seat; 7. Stop block; 8. Lock cylinder; 9. Connecting rod; 10. Spring; 11. Limiting block; 12. Rotating block; 13. Limiting seat; 14. Limiting groove; 15. Fixed seat; 16. Slot; 17. Locking protrusion; 18. Locking groove; 19. Connecting strip; 20. First arc-shaped piece; 21. Slot strip; 22. Elastic piece; 23. Moving seat; 24. Second arc-shaped piece; 25. Inclined lifting block; 26. Fixed block; 27. Slide groove; 28. Rotating seat; 29. Insertion groove; 30. Actuating rod; 31. Lower base; 32. Upper base; 33. Protruding top block; 34. Rectangular block. Detailed Implementation
[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0026] Example 1 As attached Figures 1 to 12The temporary combination lock with recoverable password shown includes a rotating base 3, a lock cylinder 8, a connecting rod 9, a spring 10, a limiting block 11, a rotating block 12, a limiting seat 13, a limiting groove 14, a fixed seat 15, a slot 16, a lower base 31, and an upper base 32. The rotating block 12 is internally limited and connected to the limiting seat 13. A fixed seat 15 is fixedly installed at one end of the limiting seat 13. A slot 16 is opened on the outer wall of the fixed seat 15. Two connecting strips 19 are fixedly installed on the lower base 31. Three first arc-shaped pieces are fixedly connected between the two connecting strips 19. 20. Each of the three first arc-shaped pieces 20 has a locking strip 21 fixedly connected to its upper surface. A movable seat 23 is slidably connected below the lower base 31. Three second arc-shaped pieces 24 are fixedly mounted on the movable seat 23. Each of the three second arc-shaped pieces 24 has a sloping lifting block 25 fixedly mounted on its upper surface. A movable component is provided at one end of the movable seat 23. Three elastic pieces 22 are provided between the two connecting strips 19. One end of each elastic piece 22 is fixedly connected to a connecting strip 19. The three elastic pieces 22 are located directly below the three rotating blocks 12.
[0027] In use, a component drives the movable base 23 and the second arc-shaped piece 24 to push them to the left. The pushed second arc-shaped piece 24 then pushes the inclined lifting block 25, located on it, below the first arc-shaped piece 20. The first arc-shaped piece 20 is then pressed by the inclined lifting block 25, pushing the locking strip 21 upwards. The upward-moving locking strip 21 is then pressed tightly against the outer wall of the fixed base 15. When password retrieval is required, the rotating block 12 rotates the limiting base 13 and the fixed base 15, which is fixedly connected to the limiting base 13. When the slot 16 on the outer wall of the fixed base 15 rotates to directly above the locking strip 21, the locking strip 21 is pressed and engaged into the slot 16. Afterwards, the fixed base 15, the limiting base 13, and the rotating block 12 cannot rotate. The limiting block 11 on the outer wall of the connecting rod 9 and the limiting groove 14 on the inner wall of the limiting seat 13 are located at the bottom. The connecting rod 9 is elastically squeezed by the spring 10, so that the connecting rod 9 drives the three limiting blocks 11 to pass through the limiting grooves 14 on the three limiting seats 13. At this time, the rotating seat 3 can be rotated to unlock the combination lock. When the rotating seat 3 rotates, the lock cylinder 8 is squeezed by the arc-shaped outer wall of the rotating seat 3, so that the lock cylinder 8 and the connecting rod 9 move to the right, and the limiting block 11 on the outer wall of the connecting rod 9 passes smoothly through the limiting groove 14. At this time, the number on the rotating block 12 is the correct password. This structure can retrieve the forgotten password, avoid the trouble of being unable to unlock the lock due to the user forgetting the password or the occurrence of forced unlocking, and improve the practicality of the device.
[0028] Example 2 Based on Example 1, the solution in Example 1 will be further described in detail below with reference to the specific working method, such as... Figures 1 to 12 As shown below, see details: In a preferred embodiment, a limiting groove 14 is formed on the inner sidewall of the limiting seat 13. A connecting rod 9 is movably inserted at the central axis of the limiting seat 13. One end of the connecting rod 9 is fixedly connected to a lock cylinder 8. A spring 10 is sleeved and connected to the outer sidewall of the connecting rod 9. Three limiting blocks 11 are fixedly connected at equal intervals on the outer sidewall of the connecting rod 9 and on one side of the spring 10, and the limiting blocks 11 are adapted to the limiting groove 14. A rectangular block 34 is connected to the end of the connecting rod 9 away from the lock cylinder 8. A locking groove 18 is formed on the inner sidewall of the rotating block 12. A locking protrusion 17 is fixedly connected to the outer sidewall of the limiting seat 13 and engages with the locking groove 18. The rotating block 12 and the limiting seat 13 are limited and connected through the engagement between the locking protrusion 17 and the locking groove 18, thus enabling unlocking. In the case where the lock cylinder 8, connecting rod 9, and limit block 11 move to the right, the three limit grooves 14 on the inner wall of the limit seat 13 are all at the bottom. When the lock cylinder 8, connecting rod 9, and limit block 11 move to the right, the three limit blocks 11 can smoothly pass through the limit grooves 14. When the lock cannot be unlocked, the password numbers rotated on the three rotating blocks 12 are incorrect. Because the rotating blocks 12 rotate incorrectly, the angle of the limit seat 13 as the rotating blocks 12 rotate is also incorrect. At this time, the limit grooves 14 on the inner wall of the limit seat 13 are not at the bottom. Therefore, when the rotating seat 3 is rotated, the limit block 11 on the connecting rod 9 is blocked by the limit seat 13. There are no limit grooves 14 for the limit block 11 to pass through, the lock cylinder 8 cannot move to the right, and the rotating seat 3 cannot rotate smoothly, ultimately making it impossible to unlock.
[0029] In a preferred embodiment, the movable component includes a key 2, a fixing block 26, a slide groove 27, a rotating seat 28, an insertion slot 29, and a lever 30. The rotating seat 28 is rotatably connected to the lower base 31. The rotating seat 28 has an insertion slot 29, in which the key 2 is inserted. The lever 30 is fixedly mounted on the bottom wall of the rotating seat 28, passing through the surface of the lower base 31. The moving seat 23 has a fixing block 26 fixedly connected to one end, and the fixing block 26 has a slide groove 27. The lever 30 is slidably connected in the groove 27. When in use, the key 2 is inserted into the insertion slot 29 opened at the top of the rotating seat 28. Then, the lever 30 is rotated by the key 2. The rotating lever 30 then moves the fixed block 26 and the movable seat 23 set at one end of the fixed block 26 to the left. At this time, the movable seat 23 drives the second arc-shaped piece 24 and the inclined lifting block 25 to move. Then, the first arc-shaped piece 20 is squeezed by the inclined lifting block 25, pushing the locking strip 21 to move upward.
[0030] In a preferred embodiment, a rotating seat 3 is rotatably connected to the upper base 32. A locking notch 4 is provided on the outer side wall of the rotating seat 3, and an unlocking notch 5 is provided on the outer side wall of the rotating seat 3 on one side of the locking notch 4. A rotating knob 1 for rotating the rotating seat 3 is connected to the top of the rotating seat 3. A connecting seat 6 is engaged with the bottom wall of the rotating seat 3. A stop block 7 is fixedly provided on the outer side wall of the bottom end of the connecting seat 6. The rotating knob 1 drives the rotating seat 3 and the connecting seat 6 and the stop block 7 at the bottom of the rotating seat 3 to rotate. Then the rotating stop block 7 extends out of the lower base 31 and the upper base 32, which is the locked state. At this time, the stop block 7 is perpendicular to the lower base 31 and the upper base 32. When the stop block 7 rotates to be parallel to the lower base 31 and the upper base 32, it is the unlocked state.
[0031] The working process of this utility model is as follows: First, in the locked state and when the password needs to be retrieved, the key 2 rotates the arrow on the rotating base 28 to the password retrieval position marked on the upper surface of the protruding top block 32 (from...). Figure 1 As can be seen, the arrow on the rotating base 28 points to the location of the lock code, while... Figure 1 For example, the first set of English labels indicates the location for retrieving the password, while the second set of English labels indicates the location for changing the password. When the key 2 is inserted into the insertion slot 29 at the top of the rotating seat 28 and the rotating seat 28 and the lever 30 at the bottom of the rotating seat 28 are rotated, the rotating lever 30 moves the fixed block 26, causing the fixed block 26 to move 23 to the left. Then, the moving seat 23 drives the second arc-shaped piece 24 to move to the left. The pushed second arc-shaped piece 24 then pushes the inclined lifting block 25 on it below the first arc-shaped piece 20. The first arc-shaped piece 20 is then pressed by the inclined lifting block 25, pushing the locking strip 21 upwards. At this point, the upward-moving locking strip 21 is tightly pressed against the outer wall of the fixed seat 15. When the password needs to be retrieved, the limiting seat 13 is rotated by the rotating block 12, and the fixed connection with the limiting seat 13 is maintained. When the fixed seat 15 rotates, when the slot 16 on the outer wall of the fixed seat 15 rotates to the top of the slot 21, the slot 21 will squeeze and engage into the slot 16. Then the fixed seat 15, the limiting seat 13, and the rotating block 12 will all be unable to rotate. At this time, the limiting block 11 on the outer wall of the connecting rod 9 and the limiting groove 14 on the inner wall of the limiting seat 13 are at the bottom. The connecting rod 9 is elastically squeezed by the spring 10, so that the connecting rod 9 drives the three limiting blocks 11 to pass through the limiting grooves 14 on the three limiting seats 13. At this time, the rotating seat 3 can be rotated to unlock the combination lock. When the rotating seat 3 rotates, the outer arc wall of the rotating seat 3 presses the lock cylinder 8, causing the lock cylinder 8 and the connecting rod 9 to move to the right. The limiting block 11 on the outer wall of the connecting rod 9 passes smoothly through the limiting groove 14. At this time, the number on the rotating block 12 is the correct password. This structure can retrieve the forgotten password and avoid the trouble of being unable to unlock the lock or being forced to unlock it due to the user forgetting the password. When the password needs to be changed, the arrow on the rotating base 28 can be rotated to the position indicating the password change using key 2. The protruding top block 33 fixedly installed on the outer wall of the rotating base 28 will press the rectangular block 34 connected to one end of the connecting rod 9. The pressed rectangular block 34 will then push the connecting rod 9 to the left. At this time, the connecting rod 9 will push the limiting block 11 to the left. Simultaneously, the limiting base 13 is connected to the limiting block 11 through 14, so that when the limiting block 11 moves to the left, it will push the limiting base 13 and the fixed base 15 fixedly connected to the limiting base 13 to move to the left. As the limiting base 13 and the fixed base 15 move to the left, the locking protrusion 17 on the outer wall of the limiting base 13 will disengage from the locking groove 18 fixedly connected to the inner wall of the rotating block 12. At this time, the rotating block 12 can be rotated at will to change the password. After the change is completed, when locking the password, the arrow on the rotating seat 28 is rotated by the key 2 to point to the position of locking the password. At this time, the protruding top block 33 releases the push against one end of the connecting rod 9. The spring 10 acts on the connecting rod 9, the fixed seat 15, and the limit seat 13 to reset to the right. At this time, the limit seat 13, which has moved to the right and reset, drives the locking protrusion 17 to insert into the locking groove 18 opened in the inner side wall of the rotating block 12, thereby locking the changed password. The above is the working principle of this temporary combination lock with a recoverable password.
Claims
1. A temporary combination lock with recoverable password, comprising a rotating base (3), a lock cylinder (8), a connecting rod (9), a spring (10), a limiting block (11), a rotating block (12), a limiting seat (13), a limiting groove (14), a fixing seat (15), a slot (16), a lower base (31), and an upper base (32), characterized in that: The rotating block (12) is internally limited by a limiting seat (13). A fixed seat (15) is fixedly provided at one end of the limiting seat (13). A slot (16) is provided on the outer side wall of the fixed seat (15). Two connecting strips (19) are fixedly provided on the lower base (31). Three first arc-shaped pieces (20) are fixedly connected between the two connecting strips (19). A locking strip (21) is fixedly connected to the upper surface of each of the three first arc-shaped pieces (20). A movable seat (23) is slidably connected below the lower base (31). Three second arc-shaped pieces (24) are fixedly provided on the movable seat (23). A sloping lifting block (25) is fixedly provided on the upper surface of each of the three second arc-shaped pieces (24). A movable component is provided at one end of the movable seat (23).
2. A temporary combination lock with recoverable password as described in claim 1, characterized in that: The inner side wall of the limiting seat (13) has a limiting groove (14). A connecting rod (9) is movably inserted at the central axis of the limiting seat (13). One end of the connecting rod (9) is fixedly connected to a lock cylinder (8). A spring (10) is sleeved and connected to the outer side wall of the connecting rod (9). Three limiting blocks (11) are fixedly connected at equal distances to the outer side wall of the connecting rod (9) and to one side of the spring (10). The limiting blocks (11) are adapted to the limiting groove (14). A rectangular block (34) is connected to the end of the connecting rod (9) away from the lock cylinder (8).
3. A temporary combination lock with recoverable password as described in claim 1, characterized in that: The movable component includes a key (2), a fixing block (26), a slide groove (27), a rotating seat (28), an insertion groove (29), and a lever (30). The rotating seat (28) is rotatably connected to the lower base (31). The rotating seat (28) has an insertion groove (29) on it. The key (2) is inserted into the insertion groove (29). The lever (30) is fixedly provided on the bottom wall of the rotating seat (28). The lever (30) passes through the surface of the lower base (31). The fixing block (26) is fixedly connected to one end of the movable seat (23). The slide groove (27) is provided on the fixing block (26). The lever (30) is slidably connected in the slide groove (27). A protruding top block (33) is fixedly provided on the outer wall of the rotating seat (28).
4. A temporary combination lock with recoverable password according to claim 1, characterized in that: A rotating seat (3) is rotatably connected to the upper base (32). A locking notch (4) is provided on the outer side wall of the rotating seat (3). An unlocking notch (5) is provided on the outer side wall of the rotating seat (3) and located on one side of the locking notch (4). A rotating knob (1) for rotating the rotating seat (3) is connected to the top of the rotating seat (3). A connecting seat (6) is engaged with the bottom wall of the rotating seat (3). A stop block (7) is fixedly provided on the outer side wall of the bottom end of the connecting seat (6).
5. A temporary combination lock with recoverable password according to claim 1, characterized in that: The inner sidewall of the rotating block (12) is provided with a locking groove (18), and the outer sidewall of the limiting seat (13) is fixedly connected with a locking protrusion (17) that is inserted into the locking groove (18).
6. A temporary combination lock with recoverable password according to claim 1, characterized in that: Three elastic pieces (22) are provided between the two connecting strips (19), and one end of the three elastic pieces (22) is fixedly connected to one connecting strip (19), and the three elastic pieces (22) are respectively located directly below the three rotating blocks (12).