A legal metrology appliance tamper-evident device
By designing a closed and protective structure for the anti-tampering box, the problem of legal measuring instruments being easily stolen and shaken was solved, thereby improving the safety and measurement accuracy of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 湘西土家族苗族自治州质量检验及计量检定中心
- Filing Date
- 2025-09-11
- Publication Date
- 2026-07-14
AI Technical Summary
Existing legal measuring instruments are easily stolen during sealing, and may be shaken or bumped during storage, affecting measurement accuracy and equipment safety.
An anti-opening box was designed. Through the combination of a closed structure and a protective structure, the box lid is prevented from being opened by the cooperation of a spring and a locking rod. The legal measuring instrument is limited and clamped by a limiting groove and a baffle to prevent shaking.
It has achieved the protection against theft and shaking of legally mandated measuring instruments, improved the safety and practicality of the equipment, and ensured the accuracy and reliability of measurement results.
Smart Images
Figure CN224492079U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of legal measuring instruments; more specifically, it relates to a device for preventing the opening of legal measuring instruments. Background Technology
[0002] Legally mandated measuring instruments refer to measuring instruments that are subject to mandatory management as stipulated by national metrology regulations. They are widely used in fields such as trade settlement, safety protection, medical and health care, and environmental monitoring. They can only be used after passing verification in order to ensure that the measurement values are accurate and reliable, and to protect fair trade and public interests.
[0003] The significance of preventing the unsealing of legal measuring instruments lies in ensuring that their key components and inspected status cannot be altered without authorization through physical sealing or electronic encryption, thereby maintaining the authority of the verification results and the accuracy of the value transmission. This is the technical cornerstone for ensuring fair trade, impartial law enforcement, medical safety, reliable environmental monitoring data, and protecting consumer rights, and is crucial for establishing a social credit system.
[0004] Currently, in the use of legal measuring instruments, in order to ensure the accuracy and reliability of these instruments, the sealing method used to prevent tampering is to affix seals. However, these seals are relatively easy to remove completely, which may lead to the theft of the legal measuring instruments and reduce the security of the equipment to some extent. In addition, legal measuring instruments are usually of different specifications, and they may be shaken and bumped during storage, which may affect the accuracy of the measuring instruments and reduce the practicality of the equipment. Therefore, there is an urgent need for a device to prevent tampering of legal measuring instruments to solve the above problems. Utility Model Content
[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a device for preventing the opening of legal measuring instruments, so as to solve the problems existing in the background art.
[0006] This utility model provides the following technical solution: a device for preventing the opening of a legally valid measuring instrument, comprising:
[0007] An anti-opening box is provided, with a lid hinged to its upper end. The outer surface of the anti-opening box and the lid has a closed structure, and a protective structure is provided inside the anti-opening box. The closed structure includes a connecting groove, a positioning rod, a first spring, a positioning groove, a first moving groove, a second moving groove, a locking block, a second spring, and a locking rod. Two sets of connecting grooves are provided, each located inside the outer surface of one end of the lid. The protective structure includes a limiting groove, a limiting block, a baffle, and bolts. Two sets of limiting grooves are provided, each located inside the inner wall surface of one side of the anti-opening box.
[0008] Preferably, the positioning rods are provided in two sets, and the two sets of positioning rods are respectively engaged inside the two sets of communicating grooves. The outer surface of each set of positioning rods is fitted with a first spring. The inner surface of the outer surface of both ends of the upper end of one side of the anti-opening box is provided with positioning grooves. The inner surface of the outer surface of one end of the upper end of the anti-opening box near the middle position is provided with a first moving groove. The inner surface of the outer surface of the other end of the box cover near the middle position is provided with a second moving groove. The inner surface of the upper end of the first moving groove and the second moving groove is provided with a locking block and a second spring. The inner surface of the first moving groove and the second moving groove is provided with a locking rod. This design allows the positioning rods to move inside the communicating grooves.
[0009] Preferably, the outer surface of the positioning rod is provided with a locking ring, and the outer dimensions of the locking ring are adapted to the inner dimensions of the connecting groove. The two ends of the first spring respectively abut against the outer surface of the locking ring and the inner wall surface of the outer side of the connecting groove. The positions of the two sets of positioning grooves correspond to the positions of the two sets of positioning rods, and the outer dimensions of the positioning rods are adapted to the inner dimensions of the positioning grooves. This design makes the positioning rod more stable inside the connecting groove by moving the locking ring inside the connecting groove, and the positioning rod will not detach from the inside of the connecting groove.
[0010] Preferably, the position of the first moving slot corresponds to the position of the second moving slot. The outer surfaces of the upper ends of the two sets of second springs respectively abut against the inner wall surfaces of the upper ends of the first and second moving slots. The outer surfaces of the lower ends of the two sets of second springs respectively abut against the outer surfaces of the upper ends of the two sets of locking blocks. The external dimensions of the locking rod are adapted to the internal dimensions of the first and second moving slots. The outer surface of the lower end of the locking block is provided with ratchet teeth. The inner surface of the outer surface of the upper end of the locking rod is provided with a ratchet groove, and the inner wall surface of the ratchet groove is in contact with the outer surface of the ratchet teeth. A baffle is fixedly connected to the outer surface of one end of the locking rod, and the locking rod is made of plastic. This design uses the elasticity of the second spring itself to drive the locking block to move automatically downward.
[0011] Preferably, the limiting block is provided in two sets, and the two sets of limiting blocks are respectively engaged inside the two sets of limiting grooves. Furthermore, a baffle is fixedly connected to the outer surface of the two sets of limiting blocks on the side close to each other. A bolt is connected to the internal thread of the upper outer surface of the baffle. This design can limit the legal measuring instrument inside the anti-opening box through the baffle, and prevent the legal measuring instrument from shaking or bumping.
[0012] Preferably, the internal dimensions of the limiting groove are adapted to the internal dimensions of the limiting block, the external dimensions of the baffle are adapted to the internal dimensions of the anti-opening box, and the outer surface of the lower end of the bolt abuts against the inner wall surface of the lower end of the anti-opening box. This design allows the baffle to be more stable when moving by the movement of the limiting block inside the limiting groove.
[0013] The technical effects and advantages of this utility model are as follows: This utility model uses a hinged rotation to close the lid. The elasticity of the first spring drives the positioning rod to move inward and insert it into the corresponding positioning groove, thus positioning the lid and preventing it from opening automatically. Simultaneously, it aligns the second moving groove with the first moving groove, allowing the locking rod to move into the first moving groove. The elasticity of the second spring then drives the locking block downward, causing the ratchet and ratchet groove to engage, preventing the locking rod from being pulled out of the first and second moving grooves. This prevents the lid from being opened without damaging the locking rod, achieving an anti-opening effect. When it is necessary to open the lid, the locking rod must be cut, allowing the two sets of positioning rods to be pulled out of the positioning grooves, thus opening the lid. This improves the safety of the equipment to a certain extent.
[0014] By moving the baffle to a suitable position inside the anti-opening box and rotating the bolts so that the outer surface of the lower end of the bolts presses against the inner wall surface at the lower end of the anti-opening box, the baffle can limit and clamp the legal measuring instrument placed inside the anti-opening box. This can prevent the legal measuring instrument from shaking or bumping when stored inside the anti-opening box, thus improving the practicality of the equipment to a certain extent. The baffle can be positioned, and its overall structure is simple and reasonable in design, highly practical, and easy to promote and apply. Attached Figure Description
[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.
[0016] Figure 2 This is a three-dimensional exploded view of the closed structure of this utility model.
[0017] Figure 3 This is a three-dimensional explosion diagram of the protective structure of this utility model.
[0018] Figure 4 This is a schematic diagram of the usage state of this utility model.
[0019] The attached diagram is labeled as follows: 1. Anti-opening box; 2. Box cover; 3. Enclosed structure; 31. Connecting groove; 32. Positioning rod; 33. First spring; 34. Positioning groove; 35. First moving groove; 36. Second moving groove; 37. Locking block; 38. Second spring; 39. Locking rod; 4. Protective structure; 41. Limiting groove; 42. Limiting block; 43. Baffle; 44. Bolt. Detailed Implementation
[0020] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The legal measuring instruments involved in this utility model are not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0021] Example 1, as Figure 1 and Figure 2 As shown, this embodiment proposes a device to prevent the opening of legally mandated measuring instruments, comprising:
[0022] The anti-opening box 1 has a lid 2 hinged to its upper end, and a sealing structure 3 is provided on the outer surface of the anti-opening box 1 and the lid 2 on one side, and a protective structure 4 is provided inside the anti-opening box 1.
[0023] The closed structure 3 includes a connecting groove 31, a positioning rod 32, a first spring 33, a positioning groove 34, a first moving groove 35, a second moving groove 36, a locking block 37, a second spring 38, and a locking rod 39. Two sets of connecting grooves 31 are provided, each set located inside the outer surface of one end of the box cover 2. Two sets of positioning rods 32 are provided, each set locking into the interior of one set of connecting grooves 31. A first spring 33 is fitted onto the outer surface of each set of positioning rods 32. Positioning grooves 34 are provided inside the outer surface of the upper end of one side of the anti-opening box 1. A locking ring is provided on the outer surface of the positioning rod 32, and the outer dimensions of the locking ring are adapted to the inner dimensions of the connecting groove 31. The two ends of the first spring 33 abut against the outer surface of the locking ring and the inner surface of the connecting groove 31 on the outer side. On the wall surface, the positions of the two sets of positioning grooves 34 correspond to the positions of the two sets of positioning rods 32, and the external dimensions of the positioning rods 32 are adapted to the internal dimensions of the positioning grooves 34. This design allows the position of the positioning rods 32 to correspond to the position of the positioning grooves 34 by hinged rotation of the box cover 2 and closing the box cover 2. The elasticity of the first spring 33 supports the locking ring on the positioning rods 32, allowing the positioning rods 32 to move inward automatically inside the connecting groove 31. The positioning rods 32 can move more stably, thus allowing the positioning rods 32 to be inserted into the corresponding positioning grooves 34. The positioning rods 32 can be more stable inside the positioning grooves 34, thereby positioning the position of the positioning rods 32 inside the positioning grooves 34 and positioning the position of the box cover 2 relative to the anti-opening box 1.
[0024] A first movable groove 35 is formed on the inner surface of the outer surface of one side of the anti-opening box 1, near the middle position. A second movable groove 36 is formed on the inner surface of the outer surface of the other side of the box cover 2, near the middle position. Both the upper inner walls of the first and second movable grooves 35 and 36 are fitted with locking blocks 37 and second springs 38. Locking rods 39 are inserted into the inner surfaces of the first and second movable grooves 35 and 36, respectively. The positions of the first and second movable grooves 35 and 36 correspond to those of the second movable grooves 36. The outer surfaces of the upper ends of the two sets of second springs 38 abut against the inner walls of the upper ends of the first and second movable grooves 35 and 36, respectively. The outer surfaces of the lower ends of the two sets of second springs 38 abut against the outer surfaces of the upper ends of the two sets of locking blocks 37, respectively. The external dimensions of the locking rods 39 are adapted to the internal dimensions of the first and second movable grooves 35 and 36. The lower outer surface of the locking blocks 37 has ratchet teeth, and the inner surface of the upper outer surface of the locking rods 39 has a ratchet groove, with the inner surface of the ratchet groove fitting against the outer surface of the ratchet teeth. A baffle is fixedly connected to the outer surface of one end of the locking rod 39, and the locking rod 39 is made of plastic. This design, by hinged rotation and closing the cover 2, can drive the position of the second moving groove 36 to correspond with the position of the first moving groove 35, so that the locking rod 39 can be inserted into the interior of the second moving groove 36 and the first moving groove 35. The locking rod 39 is more stable inside the second moving groove 36 and the first moving groove 35. The locking block 37 is supported by the elasticity of the second spring 38, so that the locking block 37 moves downward automatically and drives the ratchet to engage with the ratchet groove on the locking rod 39. This prevents the locking rod 39 from being pulled outward from the interior of the second moving groove 36. At the same time, the baffle on the locking rod 39 can block the position of the locking rod 39 inside the second moving groove 36 and the first moving groove 35. The locking rod 39 itself has a certain toughness, so it will not easily break on its own during use, and it is not too difficult to cut it when needed.
[0025] Example 2, as Figure 3 and Figure 4 As shown, based on the same concept as the above embodiments, this embodiment also proposes:
[0026] The protective structure 4 includes a limiting groove 41, a limiting block 42, a baffle 43, and a bolt 44. There are two sets of limiting grooves 41, which are respectively opened inside the inner wall surfaces on both sides of the anti-opening box 1. There are two sets of limiting blocks 42, which are respectively engaged inside the two sets of limiting grooves 41. The outer surface of the two sets of limiting blocks 42 that are close to each other is fixedly connected to the baffle 43. The upper outer surface of the baffle 43 is threaded with the bolt 44. The internal dimensions of the limiting groove 41 are adapted to the internal dimensions of the limiting block 42. The external dimensions of the baffle 43 are adapted to the internal dimensions of the anti-opening box 1. The lower outer surface of the bolt 44 abuts against the lower inner wall surface of the anti-opening box 1.
[0027] In this embodiment, by moving the baffle 43 inside the anti-opening box 1, the legal measuring instrument inside the anti-opening box 1 can be clamped and limited. At the same time, the limiting block 42 is moved inside the limiting groove 41, and the limiting block 42 can move more stably, thereby making the baffle 43 more stable. By rotating the bolt 44, the outer surface of the lower end of the bolt 44 can be pressed against the inner wall surface of the upper end of the anti-opening box 1, thereby positioning the bolt 44.
[0028] The positioning rod 32, the locking block 37, and all movable parts in this application require regular cleaning and maintenance, including but not limited to dust removal and lubrication.
[0029] Working principle: When using the equipment, first place the legal measuring instrument to be sealed inside the anti-tamper box 1. Then, move the baffle 43 to make it fit against the surface of the measuring instrument. Next, rotate the bolt 44 so that the outer surface of the lower end of the bolt 44 presses against the inner wall surface of the lower end of the anti-tamper box 1, thus limiting the position of the measuring instrument. Then, hinge and rotate the box cover 2 to close it. At this time, the elasticity of the first spring 33 will drive the two sets of positioning rods 32 to move inward automatically and insert into the two sets of positioning slots 34, thus positioning the box cover 2. Then, the locking rod 39 is inserted into the interior of the second moving groove 36 and continuously moved inward, so that the baffle is attached to the outer surface of the second moving groove 36. This allows the locking rod 39 to be simultaneously located inside the second moving groove 36 and the first moving groove 35. At this time, the elasticity of the second spring 38 itself can drive the locking block 37 to move downward, and make the ratchet groove and ratchet teeth engage with each other. This can position the locking rod 39. At this time, the box cover 2 cannot be opened without damaging the locking rod 39, thus achieving the effect of preventing opening. The above is the entire working principle of this utility model.
[0030] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.
[0031] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.
[0032] In conclusion, the above are merely preferred embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A device for preventing the opening of a legally valid measuring instrument, characterized in that, include: Anti-opening box (1), the upper end of the anti-opening box (1) is hinged to a box cover (2), and the outer surface of the anti-opening box (1) and the box cover (2) is provided with a closed structure (3), and the interior of the anti-opening box (1) is provided with a protective structure (4). The closed structure (3) includes a connecting groove (31), a positioning rod (32), a first spring (33), a positioning groove (34), a first moving groove (35), a second moving groove (36), a locking block (37), a second spring (38), and a locking rod (39). The connecting groove (31) is provided in two sets, and the two sets of connecting grooves (31) are respectively opened inside the outer surface of one end of the box cover (2). The protective structure (4) includes a limiting groove (41), a limiting block (42), a baffle (43) and a bolt (44), and the limiting groove (41) is provided in two sets, and the two sets of the limiting groove (41) are respectively opened inside the inner wall surface on both sides of the anti-opening box (1).
2. The anti-tampering device for legal measuring instruments according to claim 1, characterized in that: The positioning rod (32) is provided in two sets, and the two sets of positioning rods (32) are respectively engaged in the interior of the two sets of communicating grooves (31). The outer surface of the two sets of positioning rods (32) is fitted with a first spring (33). The interior of the outer surface of the upper end of one side of the anti-opening box (1) is provided with positioning grooves (34). The interior of the outer surface of the upper end of one side of the anti-opening box (1) near the middle position is provided with a first moving groove (35). The interior of the outer surface of the other end of the box cover (2) near the middle position is provided with a second moving groove (36). The interior of the inner wall surface of the upper end of the first moving groove (35) and the second moving groove (36) is provided with a locking block (37) and a second spring (38). The interior of the first moving groove (35) and the second moving groove (36) is provided with a locking rod (39).
3. The anti-tampering device for legal measuring instruments according to claim 1, characterized in that: The outer surface of the positioning rod (32) is provided with a locking ring, and the outer dimensions of the locking ring are adapted to the inner dimensions of the connecting groove (31). The two ends of the first spring (33) respectively abut against the outer surface of the locking ring and the inner wall surface of the outer side of the connecting groove (31). The positions of the two sets of positioning grooves (34) correspond to the positions of the two sets of positioning rods (32), and the outer dimensions of the positioning rods (32) are adapted to the inner dimensions of the positioning grooves (34).
4. The anti-tampering device for legal measuring instruments according to claim 1, characterized in that: The position of the first moving groove (35) corresponds to the position of the second moving groove (36). The outer surfaces of the upper ends of the two sets of second springs (38) respectively abut against the inner wall surfaces of the upper ends of the first moving groove (35) and the second moving groove (36). The outer surfaces of the lower ends of the two sets of second springs (38) respectively abut against the outer surfaces of the upper ends of the two sets of locking blocks (37). The external dimensions of the locking rod (39) are adapted to the internal dimensions of the first moving groove (35) and the second moving groove (36). The outer surface of the lower end of the locking block (37) is provided with ratchet teeth. The inner surface of the outer surface of the upper end of the locking rod (39) is provided with a ratchet groove, and the inner wall surface of the ratchet groove is in contact with the outer surface of the ratchet teeth. A baffle is fixedly connected to the outer surface of one end of the locking rod (39), and the material of the locking rod (39) is plastic.
5. The anti-tampering device for legal measuring instruments according to claim 1, characterized in that: The limiting block (42) is provided in two sets, and the two sets of limiting blocks (42) are respectively engaged in the interior of the two sets of limiting grooves (41). The outer surfaces of the two sets of limiting blocks (42) that are close to each other are fixedly connected with baffles (43), and the upper outer surface of the baffles (43) is internally threaded with bolts (44).
6. The anti-tampering device for legal measuring instruments according to claim 1, characterized in that: The internal dimensions of the limiting groove (41) are adapted to the internal dimensions of the limiting block (42), the external dimensions of the baffle (43) are adapted to the internal dimensions of the anti-opening box (1), and the outer surface of the lower end of the bolt (44) abuts against the inner wall surface of the lower end of the anti-opening box (1).