A secure valve lock

Abstract

The utility model relates to a fixed firm's valve lock, including main lock body and secondary lock body, is provided with the sliding track on the main lock body, is provided with the sliding plate corresponding with the sliding track on the secondary lock body, and the sliding plate and the sliding track constitute the sliding fit of main lock body and secondary lock body, and the main lock body and secondary lock body constitute the containing cavity for the valve handle containing, and is provided with the locking device between the main lock body and secondary lock body.

Description

Technical Field

[0001] This utility model relates to a securely fixed valve lock, specifically a securely fixed valve lock. Background Technology

[0002] In fluid pipeline systems of industries such as petrochemicals, chemicals, power, pharmaceuticals, and municipal waterworks, valve locks are safety devices used to restrict manual operation of valves. They physically lock the valve handle or actuator in a specific position to prevent unauthorized misoperation from causing safety accidents such as leaks, explosions, or environmental pollution. They are indispensable, especially in equipment maintenance, shutdown, and LOTO (lock-in and tag) management.

[0003] Most existing valve locks are installed and positioned by inserting an adapter into the valve handle, and then the valve lock is fixed to the valve by a padlock. However, this fixing method has shortcomings: the padlock is required to fix it every time, and if the padlock is separated from the valve lock, the locking function will be lost. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a valve lock that is securely fixed.

[0005] To achieve the above objectives, this utility model provides the following technical solution: it includes a main lock body and a secondary lock body. The main lock body is provided with a sliding track, and the secondary lock body is provided with a sliding plate corresponding to the sliding track. The sliding plate and the sliding track constitute a sliding fit between the main lock body and the secondary lock body. The main lock body and the secondary lock body constitute a receiving cavity for accommodating the valve handle. A locking device is provided between the main lock body and the secondary lock body.

[0006] By adopting the above technical solution, during operation, the valve handle is inserted into the receiving cavity formed by the main lock body and the auxiliary lock body. The relative positions of the main lock body and the auxiliary lock body are adjusted by the cooperation of the sliding plate and the sliding track to make the receiving cavity fit the size of the valve handle. Then, the locking device locks the main lock body and the auxiliary lock body to achieve clamping and fixing of the valve handle. The sliding cooperation setting allows the main lock body and the auxiliary lock body to be adjusted according to different specifications of valve handles. The locking device reliably locks the adjusted position. The receiving cavity tightly wraps the valve handle, and the valve lock and the valve handle form an integral connection, effectively preventing the valve lock from loosening or falling off the valve handle under pipeline vibration or external force collision, thus improving the fixation reliability.

[0007] The present invention is further configured such that: a fixing strip is provided on the main lock body, and a sliding groove is provided in the fixing strip. The sliding groove has a connecting channel extending to the receiving cavity and the cross-sectional area of ​​the connecting channel is smaller than the cross-sectional area of ​​the sliding groove. The sliding groove and the connecting channel form a sliding track. The sliding plate is T-shaped and includes a main plate and a connecting plate. The connecting plate connects the main plate to the secondary lock body. The main plate slides relative to the sliding groove, and the connecting plate slides relative to the connecting channel.

[0008] By adopting the above technical solution, during operation, the secondary lock body slides along with the main lock body through the connection between the connecting plate of the T-shaped sliding plate and the main plate. The main plate slides and is guided in the sliding groove, while the connecting plate slides and is limited in the connecting channel with a smaller cross-sectional area. Since the cross-sectional area of ​​the connecting channel is smaller than that of the sliding groove, the sliding plate is limited by the connecting channel during the sliding process and will not fall out of the sliding track. The T-shaped structure makes the division of labor between the main plate and the connecting plate clear and the cooperation reliable. The setting that the cross-sectional area of ​​the connecting channel is smaller than that of the sliding groove ensures that the sliding plate is limited during the sliding process and will not fall out. The overall structure has high strength and accurate guidance, realizing stable sliding cooperation between the main lock body and the secondary lock body.

[0009] The present invention is further configured such that: the locking device includes a locking block and a power mechanism; a one-way tooth-shaped moving tooth is provided on the side of the main board that is relatively far from the connecting plate; the power mechanism is provided on the fixed bar and drives the locking block to move; the locking block is provided with a mating tooth opposite to the moving tooth; the mating tooth has a locked state and an unlocked state; in the locked state, the mating tooth is located on the moving trajectory of the moving tooth and constitutes a one-way movement of the secondary lock body relative to the main lock body; in the unlocked state, the mating tooth is not located on the moving trajectory of the moving tooth.

[0010] By adopting the above technical solution, during operation, when locking is required, the power mechanism drives the locking block to move, causing the mating teeth to enter the movement trajectory of the moving teeth to form a locked state. The secondary lock body can only move unidirectionally relative to the main lock body and cannot be released. When unlocking is required, the power mechanism drives the locking block to move, causing the mating teeth to disengage from the movement trajectory of the moving teeth and enter an unlocked state. The secondary lock body can slide freely in both directions along the sliding track. The cooperation between the moving teeth and the mating teeth ensures that the secondary lock body can only move unidirectionally in the locked state and cannot be released, while it can be freely adjusted in both directions in the unlocked state. The switching between locking and unlocking is reliable, preventing the locked position from loosening and ensuring the reliability of the valve lock fixation.

[0011] The present invention is further configured such that: the power mechanism includes a rotating block, a lock cylinder and a return spring; the lock cylinder has a keyhole for inserting a key; the rotating block is disposed on the lock cylinder and rotates with the lock cylinder; the rotating block has a pushing state that pushes the locking block toward the connecting channel; the return spring has a reset state that pushes the locking block toward the direction of the rotating block; the rotating block has a first position that abuts against the locking block and a second position that is away from the locking block.

[0012] By adopting the above technical solution, during operation, when the key is inserted into the lock cylinder and rotated to the first position, the rotating block rotates with the lock cylinder until it abuts against the locking block. The rotating block pushes the locking block to move towards the connecting channel, and the mating teeth enter the movement trajectory of the moving teeth to form a locked state. The secondary lock body can only move unidirectionally relative to the main lock body and cannot be released. When the key continues to rotate to the second position, the rotating block rotates with the lock cylinder until it separates from the locking block. The locking block loses the thrust of the rotating block, and the return spring pushes the locking block back to the direction of the rotating block. The mating teeth disengage from the movement trajectory of the moving teeth and return to the unlocked state. The secondary lock body can slide freely in both directions along the sliding track. The two mating and disengaging states of the rotating block and the locking block realize reliable switching between locking and unlocking. The key's active control over the two states ensures the controllability of the locking authority. Only the person holding the key can switch the locking state. The return spring automatically resets the locking block to the unlocked state when the rotating block and the locking block separate. The operation is convenient and the switching is reliable.

[0013] The present invention is further configured to include a housing, a locking rod, and a reset plate. The lock cylinder is disposed in the housing, the locking rod is disposed in the housing and the locking block rotates around the locking rod, the reset plate is disposed in the housing and the reset spring is disposed between the reset plate and the locking block.

[0014] By adopting the above technical solution, during operation, the lock cylinder is fixed inside the housing, providing a stable installation reference. The locking rod serves as the rotation fulcrum of the locking block, allowing the locking block to rotate around it. When the key turns the lock cylinder to the first position, the rotating block abuts against the locking block, pushing the locking block to rotate around the locking rod and move towards the connecting channel. The engaging teeth enter the movement trajectory of the moving teeth, forming a locked state. When the key turns the lock cylinder to the second position, the rotating block separates from the locking block. The return spring is located between the return plate and the locking block, pushing the locking block back to the direction of the rotating block. The engaging teeth disengage from the movement trajectory of the moving teeth and return to the unlocked state. The return plate is fixed to the housing, ensuring the stability of the spring force transmission. The cooperation of the housing, locking rod, and return plate provides reliable support for the installation, rotation, and reset of the locking block, making the locking device compact, securely installed, and reliably operated. The rotation fulcrum design of the locking rod makes the movement trajectory of the locking block precisely controllable, and the return plate ensures the stable transmission of the spring force, improving the service life and operational reliability of the locking device.

[0015] The present invention is further configured such that: the power mechanism includes a lock cylinder, a central rod and an eccentric wheel; the lock cylinder has a keyhole for inserting a key; the lock cylinder drives the central rod to rotate; the eccentric wheel is located on the central rod and the center of the eccentric wheel does not coincide with the center rod; the locking block is provided with a U-shaped groove; the eccentric wheel is located in the U-shaped groove and constitutes the movement of the locking block along the sliding track direction.

[0016] By adopting the above technical solution, during operation, when the key is inserted into the lock cylinder and turned, the lock cylinder drives the central rod to rotate synchronously. Since the center of the eccentric wheel does not coincide with the central rod, the eccentric wheel generates eccentric motion in the U-shaped groove when the central rod rotates. The groove wall of the U-shaped groove is squeezed by the eccentric wheel and pushes the locking block to move along the sliding track. The locking block moves to the locking position where the mating teeth enter the moving tooth trajectory. The secondary lock body can only move unidirectionally relative to the main lock body and cannot be released. When the key continues to turn, the eccentric wheel rotates with the central rod to another position. Under the action of the eccentric wheel, the locking block moves in the opposite direction along the sliding track. The mating teeth disengage from the moving tooth trajectory and return to the unlocked state. The secondary lock body can slide freely in both directions. The eccentric structure of the eccentric wheel converts the rotational motion of the lock cylinder into the linear movement of the locking block. The key turns to different positions to achieve locking and unlocking respectively. The motion transmission is reliable and the structure is compact. The cooperation between the U-shaped groove and the eccentric wheel makes the motion conversion smooth and stable, with low wear and long service life, providing another reliable locking drive method. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a structural schematic diagram of the power mechanism and locking block of Embodiment 1 of this utility model; Figure 3 This is a schematic diagram of the power mechanism and locking block of Embodiment 2 of this utility model.

[0018] In the diagram: 1. Main lock body; 2. Secondary lock body; 3. Sliding track; 31. Sliding groove; 32. Connecting channel; 4. Sliding plate; 41. Main board; 42. Connecting plate; 43. Moving tooth; 5. Receiving cavity; 6. Fixing bar; 7. Power mechanism; 71. Locking block; 711. Center rod; 712. Eccentric wheel; 713. U-shaped groove; 72. Matching tooth; 73. Rotating block; 74. Lock cylinder; 75. Return spring; 76. Keyhole; 77. Housing; 78. Locking rod; 79. Return plate. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] As shown in the figure, this utility model discloses a securely fixed valve lock, including a main lock body 1 and a secondary lock body 2. The main lock body 1 is provided with a sliding rail 3, and the secondary lock body 2 is provided with a sliding plate 4 corresponding to the sliding rail 3. The sliding plate 4 and the sliding rail 3 form a sliding fit between the main lock body 1 and the secondary lock body 2. The main lock body 1 and the secondary lock body 2 form a receiving cavity 5 for accommodating the valve handle. A locking device is provided between the main lock body 1 and the secondary lock body 2. During operation, the valve handle is inserted into the receiving cavity 5 formed by the main lock body 1 and the secondary lock body 2, and the valve handle is engaged by the sliding plate 4 and the sliding rail 3. The relative positions of the main lock body 1 and the auxiliary lock body 2 are adjusted to make the receiving cavity 5 fit the size of the valve handle. Then, the main lock body 1 and the auxiliary lock body 2 are locked by the locking device to achieve clamping and fixing of the valve handle. The sliding fit setting allows the main lock body 1 and the auxiliary lock body 2 to be adjusted according to different specifications of valve handles. The locking device reliably locks the adjusted position. The receiving cavity 5 tightly wraps the valve handle, and the valve lock and the valve handle form an integral connection, effectively preventing the valve lock from loosening or falling off the valve handle under pipeline vibration or external force collision, thus improving the fixation reliability.

[0022] A fixing strip 6 is provided on the main lock body 1, and a sliding groove 31 is provided inside the fixing strip 6. The sliding groove 31 has a connecting channel 32 extending to communicate with the receiving cavity 5, and the cross-sectional area of ​​the connecting channel 32 is smaller than the cross-sectional area of ​​the sliding groove 31. The sliding groove 31 and the connecting channel 32 form a sliding track 3. The sliding plate 4 is T-shaped and includes a main plate 41 and a connecting plate 42. The connecting plate 42 connects the main plate 41 to the secondary lock body 2. The main plate 41 slides relative to the sliding groove 31, and the connecting plate 42 slides relative to the connecting channel 32. During operation, the secondary lock body 2 moves along with the main lock body 41 through the connection between the connecting plate 42 and the main plate 41 of the T-shaped sliding plate 4. The lock body 1 slides, the main board 41 slides and is guided within the sliding groove 31, and the connecting plate 42 slides and is limited within the connecting channel 32 with a smaller cross-sectional area. Since the cross-sectional area of ​​the connecting channel 32 is smaller than that of the sliding groove 31, the sliding plate 4 is limited by the connecting channel 32 during the sliding process and will not come out of the sliding track 3. The T-shaped structure makes the main board 41 and the connecting plate 42 have clear division of labor and reliable cooperation. The setting that the cross-sectional area of ​​the connecting channel 32 is smaller than that of the sliding groove 31 makes the sliding plate 4 limited during the sliding process and will not come out. The overall structure has high strength and accurate guidance, realizing stable sliding cooperation between the main lock body 1 and the auxiliary lock body 2.

[0023] The locking device includes a locking block 71 and a power mechanism 7. A one-way toothed moving tooth 43 is provided on the side of the main board 41 opposite to the connecting plate. The power mechanism 7 is mounted on the fixed strip 6 and drives the locking block 71 to move. The locking block 71 has a mating tooth 72 opposite to the moving tooth 43. The mating tooth 72 has a locked state and an unlocked state. In the locked state, the mating tooth 72 is located on the moving trajectory of the moving tooth 43, constituting a one-way movement of the secondary lock body 2 relative to the main lock body 1. In the unlocked state, the mating tooth 72 is not located on the moving trajectory of the moving tooth 43. During operation, when locking is required, the power mechanism 7 drives the locking block 71. The movement of the main lock body 1 causes the mating tooth 72 to enter the movement trajectory of the moving tooth 43, forming a locked state. The secondary lock body 2 can only move in one direction relative to the main lock body 1 and cannot be released. When unlocking is required, the power mechanism 7 drives the locking block 71 to move, causing the mating tooth 72 to disengage from the movement trajectory of the moving tooth 43 and enter the unlocked state. The secondary lock body 2 can slide freely in both directions along the sliding track 3. The cooperation between the moving tooth 43 and the mating tooth 72 ensures that the secondary lock body 2 can only move in one direction and cannot be released in the locked state, while it can be freely adjusted in both directions in the unlocked state. The switching between locking and unlocking is reliable, preventing the locked position from loosening and ensuring the reliability of the valve lock fixation.

[0024] The power mechanism 7 includes a rotating block 73, a lock cylinder 74, and a return spring 75. The lock cylinder 74 has a keyhole 76 for key insertion. The rotating block 73 is mounted on the lock cylinder 74 and rotates with it. The rotating block 73 has a pushing state that pushes the locking block 71 toward the connecting channel 32. The return spring 75 has a returning state that pushes the locking block 71 toward the direction of the rotating block 73. The rotating block 73 has a first position abutting against the locking block 71 and a second position separating from it. During operation, the key is inserted into the lock cylinder 74 and rotated to the first position. The rotating block 73 rotates with the lock cylinder 74 until it abuts against the locking block 71. The rotating block 73 pushes the locking block 71 toward the connecting channel 32, and the engaging teeth 72 enter the movement trajectory of the moving teeth 43 to form a locked state. The secondary lock body 2 can only... The main lock body 1 can move in one direction but cannot be released; the key continues to turn to the second position, the rotating block 73 rotates with the lock cylinder 74 until it is separated from the locking block 71, the locking block 71 loses the thrust of the rotating block 73, the return spring 75 pushes the locking block 71 back to the direction of the rotating block 73, the engaging tooth 72 disengages from the moving tooth 43 and returns to the unlocked state, and the secondary lock body 2 can slide freely in both directions along the sliding track 3; the two engaging states of the rotating block 73 and the locking block 71, which are both in contact and out of contact, realize the reliable switching between locking and unlocking. The key's active control of the two states ensures the controllability of the locking authority. Only the person holding the key can switch the locking state. When the rotating block 73 and the locking block 71 are separated, the return spring 75 automatically resets the locking block 71 to the unlocked state, which is convenient to operate and reliable in switching.

[0025] It also includes a housing 77, a locking rod 78, and a reset plate 79. The lock cylinder 74 is disposed within the housing 77. The locking rod 78 is disposed within the housing 77, and the locking block 71 rotates around the locking rod 78. The reset plate 79 is disposed within the housing 77, and a reset spring 75 is disposed between the reset plate 79 and the locking block 71. During operation, the lock cylinder 74 is fixed within the housing 77, providing a stable mounting reference. The locking rod 78 serves as the fulcrum for the rotation of the locking block 71, allowing the locking block 71 to rotate around it. When the key turns the lock cylinder 74 to the first position, the rotating block 73 abuts against the locking block 71, pushing the locking block 71 to rotate around the locking rod 78 and move towards the connecting channel 32. The engaging teeth 72 enter the movement trajectory of the moving teeth 43, forming a locked state. When the key turns the lock cylinder 74... When the device reaches the second position, the rotating block 73 separates from the locking block 71. The reset spring 75 is positioned between the reset plate 79 and the locking block 71, pushing the locking block 71 back to the direction of the rotating block 73. The engaging tooth 72 disengages from the movement trajectory of the moving tooth 43 and returns to the unlocked state. The reset plate 79 is fixed to the housing 77 to ensure the stability of the spring force transmission. The cooperation of the housing 77, the locking rod 78, and the reset plate 79 provides reliable support for the installation, rotation, and reset of the locking block 71, making the locking device compact, securely installed, and reliably operated. The rotation fulcrum design of the locking rod 78 makes the movement trajectory of the locking block 71 precisely controllable. The reset plate 79 ensures the stable transmission of the spring force, improving the service life and operational reliability of the locking device.

[0026] The power mechanism 7 includes a lock cylinder 74, a center rod 711, and an eccentric wheel 712. The lock cylinder 74 has a keyhole 76 for inserting a key. The lock cylinder 74 drives the center rod 711 to rotate. The eccentric wheel 712 is located on the center rod 711, but its center does not coincide with the center rod 711. The locking block 71 is provided with a U-shaped groove 713. The eccentric wheel 712 is located in the U-shaped groove 713 and constitutes the movement of the locking block 71 along the sliding track 3. During operation, the key is inserted into the lock cylinder 74 and rotates. The lock cylinder 74 drives the center rod 711 to rotate synchronously. Since the center of the eccentric wheel 712 does not coincide with the center rod 711, the eccentric wheel 712 generates eccentric motion in the U-shaped groove 713 when the center rod 711 rotates. The groove wall of the U-shaped groove 713 is squeezed by the eccentric wheel 712 and pushes the locking block 71 along the sliding track 3. As the key continues to turn, the locking block 71 moves to the locking position where the mating tooth 72 enters the track of the moving tooth 43. The secondary lock body 2 can only move unidirectionally relative to the main lock body 1 and cannot be released. As the key continues to turn, the eccentric wheel 712 rotates with the center rod 711 to another position. Under the action of the eccentric wheel 712, the locking block 71 moves in the opposite direction along the sliding track 3. The mating tooth 72 disengages from the moving track of the moving tooth 43 and returns to the unlocked state. The secondary lock body 2 can slide freely in both directions. The eccentric structure of the eccentric wheel 712 converts the rotational motion of the lock cylinder 74 into the linear movement of the locking block 71. The key turns to different positions to achieve locking and unlocking respectively. The motion transmission is reliable and the structure is compact. The cooperation between the U-shaped groove 713 and the eccentric wheel 712 makes the motion conversion smooth and stable, with low wear and long service life, providing another reliable locking drive method.

[0027] Example 1: When installing the valve lock, insert the valve handle into the receiving cavity 5 formed by the main lock body 1 and the auxiliary lock body 2. At this time, the locking block 71 is in the unlocked state, the mating teeth 72 are not located on the moving track of the moving teeth 43, the auxiliary lock body 2 can slide freely in both directions along the sliding track 3, the connecting plate 42 of the T-shaped sliding plate 4 slides in the connecting channel 32 of the fixing bar 6, the main plate 41 is guided in the sliding groove 31, and the relative position of the main lock body 1 and the auxiliary lock body 2 is adjusted by sliding to make the receiving cavity 5 fit the size of the valve handle; after adjustment, insert the key and rotate the lock cylinder 74 to the first position. The rotating block 73 rotates with the lock cylinder 74 until it abuts against the locking block 71, pushing the locking block 71 to rotate around the locking rod 78 and move towards the connecting channel 32. The mating teeth 72 enter the moving track of the moving teeth 43. When locked, the secondary lock body 2 can only move in one direction relative to the main lock body 1 and cannot be released. The valve lock is locked on the valve handle. When unlocking is required, the key is turned to the lock cylinder 74 to the second position. The rotating block 73 rotates with the lock cylinder 74 until it is separated from the locking block 71. The locking block 71 loses the thrust of the rotating block 73. The return spring 75 pushes the locking block 71 back to the direction of the rotating block 73. The engaging tooth 72 disengages from the movement trajectory of the moving tooth 43 and returns to the unlocked state. The secondary lock body 2 can slide freely in both directions. The sliding plate 4 will not come out of the sliding track 3 under the limit of the connecting channel 32. The valve lock is tightly fixed on the valve handle to form an integral connection. It can still maintain a reliable fixed state under pipeline vibration or external force collision, effectively preventing loosening or disengagement, and ensuring the safe management of valve operation.

[0028] Example 2: The difference from Example 1 lies in the different power mechanism 7. The key is inserted into the lock cylinder 74 and rotated. The lock cylinder 74 drives the center rod 711 to rotate synchronously. Since the center of the eccentric wheel 712 does not coincide with the center rod 711, the eccentric wheel 712 generates eccentric motion in the U-shaped groove 713 when the center rod 711 rotates. The groove wall of the U-shaped groove 713 is squeezed by the eccentric wheel 712 and pushes the locking block 71 to move along the sliding track 3. The locking block 71 moves to the locking position where the mating tooth 72 enters the trajectory of the moving tooth 43. The secondary lock body 2 can only move in one direction relative to the main lock body 1 and cannot be released. The key continues to rotate, and the eccentric wheel 712 rotates with the center rod 711 to another position. The locking block 71 moves in the opposite direction along the sliding track 3 under the action of the eccentric wheel 712. The mating tooth 72 disengages from the movement trajectory of the moving tooth 43 and returns to the unlocked state. The secondary lock body 2 can slide freely in both directions.

Claims

1. A secure valve lock, characterized by: It includes a main lock body (1) and a secondary lock body (2). The main lock body (1) is provided with a sliding rail (3), and the secondary lock body (2) is provided with a sliding plate (4) corresponding to the sliding rail (3). The sliding plate (4) and the sliding rail (3) constitute the sliding cooperation between the main lock body (1) and the secondary lock body (2). The main lock body (1) and the secondary lock body (2) constitute a receiving cavity (5) for accommodating the valve handle. A locking device is provided between the main lock body (1) and the secondary lock body (2). The main lock body (1) is provided with a fixing strip (6), and a sliding groove (31) is provided inside the fixing strip (6). The sliding groove (31) has a connecting channel (32) extending to the receiving cavity (5) and the cross-sectional area of ​​the connecting channel (32) is smaller than the cross-sectional area of ​​the sliding groove (31).

2. A secure valve lock as defined in claim 1, wherein: The sliding groove (31) and the connecting channel (32) form a sliding track (3). The sliding plate (4) is T-shaped and includes a main plate (41) and a connecting plate (42). The connecting plate (42) connects the main plate (41) to the secondary lock body (2). The main plate (41) slides relative to the sliding groove (31), and the connecting plate (42) slides relative to the connecting channel (32).

3. A secure valve lock as defined in claim 2, wherein: The locking device includes a locking block (71) and a power mechanism (7). The main board (41) is provided with a moving tooth (43) on the side away from the connecting plate. The power mechanism (7) is provided on the fixed bar (6) and drives the locking block (71) to move. The locking block (71) is provided with a mating tooth (72) opposite to the moving tooth (43). The mating tooth (72) has a locked state and an unlocked state. In the locked state, the mating tooth (72) is located on the moving trajectory of the moving tooth (43) and constitutes a one-way movement of the secondary lock body (2) relative to the main lock body (1). In the unlocked state, the mating tooth (72) is not located on the moving trajectory of the moving tooth (43).

4. A secure valve lock as defined in claim 3, wherein: The moving tooth is a unidirectional tooth.

5. The secure valve lock of claim 3, wherein: The power mechanism (7) includes a rotating block (73), a lock cylinder (74) and a return spring (75). The lock cylinder (74) has a keyhole (76) for inserting a key. The rotating block (73) is disposed on the lock cylinder (74) and rotates with the lock cylinder (74). The rotating block (73) has a pushing state that pushes the locking block (71) toward the connecting channel (32). The return spring (75) has a reset state that pushes the locking block (71) toward the direction of the rotating block (73). The rotating block (73) has a first position that abuts against the locking block (71) and a second position that is away from the locking block (71).

6. A secure valve lock as defined in claim 5, wherein: It also includes a housing (77), a locking rod (78) and a reset plate (79). The lock cylinder (74) is disposed in the housing (77), the locking rod (78) is disposed in the housing (77) and the locking block (71) rotates around the locking rod (78), the reset plate (79) is disposed in the housing (77) and the reset spring (75) is disposed between the reset plate (79) and the locking block (71).

7. A secure valve lock as defined in claim 3, wherein: The power mechanism (7) includes a lock cylinder (74), a center rod (711) and an eccentric wheel (712). The lock cylinder (74) has a keyhole (76) for inserting a key. The lock cylinder (74) drives the center rod (711) to rotate. The eccentric wheel (712) is located on the center rod (711) and the center of the eccentric wheel (712) does not coincide with the center rod (711). The locking block (71) is provided with a U-shaped groove (713). The eccentric wheel (712) is located in the U-shaped groove (713) and constitutes the movement of the locking block (71) along the sliding track (3).

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