A mechanical lock for preventing accidental activation of an external control box for a frequency converter

Abstract

This utility model discloses a mechanical lock for preventing accidental activation of an external control box for a frequency converter. It includes a lock body mechanism mounted on the cover of the external control box, with a protective component on which local components are shielded from dust. A locking component for fixing the protective component to the lock body mechanism is provided. The protective component shields the combination wheel assembly when not in use, preventing it from being exposed to outside air for extended periods and accumulating dust. This further prevents dust from entering the lock body mechanism and affecting the rotation of the combination wheel assembly, ensuring smooth rotation and improving the overall performance of the lock body mechanism. The locking component positions the protective component, preventing accidental opening due to accidental activation, thus enhancing its protective effect.

Description

Technical Field

[0001] This utility model relates to the field of mechanical lock technology, and in particular to a mechanical lock for preventing accidental activation of an external control box for a frequency converter. Background Technology

[0002] A frequency converter is a power control device that uses frequency conversion technology and microelectronics to control an AC motor by changing the frequency of its power supply. The external control cabinet of the frequency converter plays a crucial role. It is a device specifically designed to control the operation of the frequency converter, possessing a variety of powerful functions, and providing strong support for the efficient and stable operation of industrial production.

[0003] To ensure the physical safety of the electrical components inside the inverter's external control box, a mechanical lock is installed on the box. This mechanical lock is a highly reliable, fully mechanical combination lock with a large key set and no electronic components, preventing unauthorized access and potential damage to the inverter's external control box.

[0004] Patent document CN222457086U discloses a rotary combination lock with anti-accidental touch function. By adjusting the rotation angle of the key used to unlock the lock cylinder, a gap exists between the key handle and the dial. When the lock cylinder is unlocked by turning the key, the gap between the key handle and the dial reaches its maximum. This ensures that during the code search process by turning the dial, the gap prevents accidental touch of the key handle, thus effectively preventing the key from being accidentally reset and interrupting the code search. The driving method between the lock cylinder and the code search mechanism has been adjusted, using an eccentric wheel and a movable drive plate to drive the code search mechanism, which better adapts to the key rotation unlocking process. The rotation angle required for key unlocking is set to 180°, ensuring that the key handle is in a horizontal position when the key is first inserted and after unlocking, thus maintaining the maximum gap between the key handle and the dial at these two points in time, facilitating the operator's operation.

[0005] Although the aforementioned rotary combination lock with anti-accidental touch function can solve the corresponding technical problems, its combination wheel assembly is exposed to the outside, and dust easily adheres to the surface of the combination wheel assembly. When the combination wheel assembly is turned, the dust will enter the inside of the panel, causing the subsequent combination wheel assembly to rotate unevenly, thus making the rotary combination lock difficult to open and affecting the normal use of the rotary combination lock.

[0006] To address this, a mechanical lock for preventing accidental activation of the external control box of the frequency converter is proposed. Utility Model Content

[0007] The purpose of this utility model is to provide a mechanical lock for preventing accidental activation of the external control box of a frequency converter, in order to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0009] A mechanical lock for preventing accidental activation of an external control box for a frequency converter includes:

[0010] A locking mechanism is provided on the cover of the external control box of the frequency converter, which is equipped with a protective component that can shield and prevent dust from local components. A snap-fit ​​component for fixing is provided between the protective component and the locking mechanism.

[0011] The protective component includes a cover movably connected to the surface of the lock body mechanism. A first protrusion is fixedly connected to both sides of the top of the cover. A second protrusion is rotatably connected between the two first protrusions. The second protrusion is disposed on the lock body mechanism. The snap-fit ​​component is disposed between the bottom of the cover and the lock body mechanism.

[0012] As a preferred technical solution, the lock body mechanism includes a housing mounted on the external control box cover of the frequency converter, a lock tongue mounted on the housing, a key lock cylinder provided on the lower part of the housing surface, a knob rotatably connected to the outer surface of the housing, the lock tongue being able to lock or unlock by rotating the key lock cylinder and the knob, a combination wheel assembly for cooperating with the knob provided on the upper part of the housing surface, a cover covering the surface of the combination wheel assembly, and one side of the second protrusion being fixedly connected to the housing.

[0013] As a preferred technical solution, the snap-fit ​​assembly includes a groove formed on the surface of the housing and located below the combination wheel assembly, a slot is formed at the bottom of the inner cavity of the groove, and a pin is provided at the bottom of the cover to cooperate with the groove.

[0014] As a preferred technical solution, the pin includes a protrusion fixedly connected to the bottom of the cover facing the housing, the protrusion being engaged in the groove, and a locking block movably connected to the protrusion being able to be engaged in the inner cavity of the locking groove.

[0015] As a preferred technical solution, a slot is provided on the side of the protrusion away from the housing, the locking block is movably connected to the inner cavity of the slot, and the bottom of the locking block moves through to the bottom of the protrusion and is locked into the slot.

[0016] As a preferred technical solution, an iron block is fixedly connected to the surface of the card block, and one side of the iron block extends through a slot to the outside of the protrusion.

[0017] As a preferred technical solution, two symmetrically arranged magnets are fixedly connected to the bottom of the inner cavity of the slot, and the iron block is magnetically attracted to the magnets.

[0018] As a preferred technical solution, the card block has an inclined surface on the side facing the housing, and the bottom of the groove cavity has an arc surface.

[0019] This utility model has at least the following beneficial effects:

[0020] This application utilizes a protective component to shield the combination wheel assembly when it is not in use, preventing the combination wheel assembly from being exposed to the outside air for extended periods and accumulating dust. This further prevents dust from entering the lock body mechanism and affecting the rotation of the combination wheel assembly, ensuring the smooth rotation of the combination wheel assembly and improving the usability of the lock body mechanism. The snap-fit ​​component also positions the protective component, preventing it from being accidentally opened due to accidental contact, thereby enhancing the protective effect of the protective component. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the protective components of the anti-accidental touch mechanical lock of the inverter external control box of this utility model in a protected state.

[0022] Figure 2 This is a schematic diagram of the combination wheel assembly of the anti-accidental touch mechanical lock of the inverter external control box of this utility model in its use state;

[0023] Figure 3 This is an exploded schematic diagram of the latch structure of the anti-accidental activation mechanical lock of the external control box of the frequency converter of this utility model.

[0024] In the diagram: 100, lock body mechanism; 110, housing; 120, bolt; 130, key lock cylinder; 140, knob; 150, combination wheel assembly; 200, protective assembly; 210, cover; 220, first protrusion; 230, second protrusion; 300, locking assembly; 310, groove; 320, slot; 330, pin; 331, protrusion; 332, locking block; 3321, bevel; 333, slot; 334, iron block; 335, magnet. 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] Please see Figures 1-3This utility model provides a mechanical lock for preventing accidental activation of an external control box for a frequency converter. It includes a lock body mechanism 100 mounted on the cover of the external control box, a protective component 200 that shields and prevents dust from some parts of the lock body mechanism 100, and a locking component 300 for fixing. The protective component 200 is mounted on the lock body mechanism 100, and the locking component 300 is located between the lock body mechanism 100 and the protective component 200. The protective component 200 includes a cover 210 movably connected to the surface of the lock body mechanism 100. A first protrusion 220 is fixedly connected to both sides of the top of the cover 210. A second protrusion 230 is rotatably connected between the two first protrusions 220 via a rotating shaft. The second protrusion 230 is mounted on the lock body mechanism 100. The locking component 300 is located between the bottom of the cover 210 and the lock body mechanism 100.

[0027] The lock mechanism 100 includes a housing 110 mounted on the cover of the inverter's external control box. A lock tongue 120 is mounted on the housing 110. A key lock cylinder 130 is provided on the lower part of the surface of the housing 110. A knob 140 is rotatably connected to the outer surface of the housing 110. The lock tongue 120 can lock or unlock by rotating the key lock cylinder 130 and the knob 140. A combination wheel assembly 150 is provided on the upper part of the surface of the housing 110 and works in conjunction with the knob 140. A cover 210 is provided on the surface of the combination wheel assembly 150. One side of the second protrusion 230 is fixedly connected to the housing 110.

[0028] It should be noted that the working principle of the lock body mechanism 100 is consistent with that of a rotary combination lock with anti-accidental touch function disclosed in the existing announcement CN222457086U. It can ensure that the key handle is not accidentally touched during the process of searching for the code by turning the dial, thus effectively preventing the key from being accidentally reset and causing the code search to be interrupted. It has the advantage of preventing accidental touch. It is existing technology, so it will not be described in detail in this technical solution.

[0029] The snap-fit ​​assembly 300 includes a groove 310 formed on the surface of the housing 110 and located below the combination wheel assembly 150. The bottom of the inner cavity of the groove 310 is provided with a slot 320. The bottom of the cover 210 is provided with a pin 330 that cooperates with the groove 310. The snap-fit ​​assembly 300 can position the protective assembly 200 and prevent the protective assembly 200 from being accidentally opened due to accidental contact, thereby helping to improve the protective effect of the protective assembly 200.

[0030] The pin 330 includes a protrusion 331 fixedly connected to the bottom of the cover 210 facing the housing 110. The protrusion 331 is engaged in the groove 310. A locking block 332 is movably connected to the protrusion 331 and can be engaged in the inner cavity of the slot 320. When the protrusion 331 is engaged in the groove 310 and the locking block 332 is engaged in the inner cavity of the slot 320, the cover 210 can be effectively prevented from flipping around the pivot, thereby achieving a positioning effect.

[0031] The protrusion 331 has a slot 333 on the side away from the housing 110. The locking block 332 is movably connected to the inner cavity of the slot 333, and the bottom of the locking block 332 moves through to the bottom of the protrusion 331 and is locked into the slot 320. The slot 333 provides space for the locking block 332 to slide within the slot 333, so as to achieve the positioning or unlocking of the protective component 200.

[0032] Among them, an iron block 334 is fixedly connected to the surface of the card block 332. One side of the iron block 334 extends through the slot 333 to the outside of the protrusion 331. The iron block 334 can increase the contact area between the operator's hand and the card block 332, making it easier to move the card block 332.

[0033] Two symmetrically arranged magnets 335 are fixedly connected to the bottom of the inner cavity of the slot 333. The iron block 334 is magnetically attracted to the magnets 335. Through the cooperation of the magnets 335 and the iron block 334, the locking block 332 can be positioned, so that the locking block 332 can be stably locked in the slot 320, preventing the locking block 332 from shaking randomly in the slot 333, and further improving the locking effect of the locking block 332.

[0034] The locking block 332 has an inclined surface 3321 on the side facing the housing 110, and an arc surface at the bottom of the inner cavity of the groove 310. When the cover 210 flips over and covers the surface of the combination wheel assembly 150, it will drive the locking block 332 to move towards the groove 310. After moving to a certain position, the inclined surface 3321 contacts the arc surface. At this time, the cover 210 continues to drive the locking block 332 to move. The inclined surface 3321 is squeezed by the arc surface, causing the locking block 332 to move into the slot 333 on its own until the cover 210 rotates to the maximum extent. The inclined surface 3321 loses the constraint of the arc surface, and the locking block 332 automatically locks into the slot 320 under its own weight and the magnetic force of the magnet 335. This makes it more convenient to use as the cover 210 does not need to be operated when flipping over and covering the locking block 332.

[0035] The working principle of this utility model is as follows: By pushing the iron block 334 upward, the iron block 334 causes the locking block 332 to slide within the cavity of the slot 333 until the iron block 334 separates from the magnet 335 and the locking block 332 disengages from the cavity of the slot 320; then, the iron block 334 is flipped to open the cover 210, causing the cover 210 to rotate the first protrusion 220 around the pivot until it reaches its maximum extent, thus exposing the combination wheel assembly 150. At this point, the combination wheel assembly 150 can be turned to perform the unlocking operation; after use, the cover is closed. The cover 210 is flipped and placed on the surface of the combination wheel assembly 150. When the cover 210 moves the pin 330 a certain distance, the inclined surface 3321 is squeezed by the arc surface, causing the locking block 332 to move towards the inner cavity of the slot 333 on its own until the maximum extent. The inclined surface 3321 loses its constraint, and the locking block 332 automatically locks into the slot 320 by its own gravity and the magnetic force of the magnet 335. This completes the positioning operation of the cover 210, so that the cover 210 is stably placed on the surface of the combination wheel assembly 150 to cover and prevent dust.

[0036] All parts not described in this utility model are the same as or can be implemented using existing technology. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mechanical lock for preventing accidental touch of an external control box of a frequency converter, characterized in that, include: A locking mechanism (100) is provided on the cover of the external control box of the frequency converter, and a protective component (200) is provided on it to shield and prevent dust from local components. A snap-fit ​​component (300) for fixing is provided between the protective component (200) and the locking mechanism (100). The protective component (200) includes a cover (210) movably connected to the surface of the lock body mechanism (100). A first protrusion (220) is fixedly connected to both sides of the top of the cover (210). A second protrusion (230) is rotatably connected between the two first protrusions (220). The second protrusion (230) is provided on the lock body mechanism (100). The snap-fit ​​component (300) is provided between the bottom of the cover (210) and the lock body mechanism (100).

2. The anti-mis-touch mechanical lock of the frequency converter external control box according to claim 1, characterized in that: The lock mechanism (100) includes a housing (110) mounted on the cover of the external control box of the frequency converter. A lock tongue (120) is mounted on the housing (110). A key lock cylinder (130) is provided on the lower part of the surface of the housing (110). A knob (140) is rotatably connected to the outer surface of the housing (110). The lock tongue (120) can lock or unlock by rotating with the key lock cylinder (130) and the knob (140). A combination wheel assembly (150) is provided on the upper part of the surface of the housing (110) to cooperate with the knob (140). A cover (210) is provided on the surface of the combination wheel assembly (150). One side of the second protrusion (230) is fixedly connected to the housing (110).

3. The anti-mis-touch mechanical lock of the frequency converter external control box according to claim 2, characterized in that: The snap-fit ​​assembly (300) includes a groove (310) formed on the surface of the housing (110) and located below the password wheel assembly (150). The bottom of the inner cavity of the groove (310) is provided with a slot (320), and the bottom of the cover (210) is provided with a pin (330) that cooperates with the groove (310).

4. The anti-mis-touch mechanical lock of the external control box of the frequency converter according to claim 3, characterized in that: The pin (330) includes a protrusion (331) fixedly connected to the bottom of the cover (210) facing the housing (110), the protrusion (331) being engaged in the groove (310), and a locking block (332) movably connected to the protrusion (331) being able to be engaged in the inner cavity of the locking slot (320).

5. The anti-mis-touch mechanical lock of the external control box of the frequency converter according to claim 4, characterized in that: The protrusion (331) has a slot (333) on the side away from the housing (110). The locking block (332) is movably connected to the inner cavity of the slot (333), and the bottom of the locking block (332) moves through to the bottom of the protrusion (331) and is locked into the slot (320).

6. The anti-accidental-touch mechanical lock for the external control box of the frequency converter according to claim 5, characterized in that: An iron block (334) is fixedly connected to the surface of the card block (332), and one side of the iron block (334) extends through a slot (333) to the outside of the protrusion (331).

7. The anti-mis-touch mechanical lock of the frequency converter external control box according to claim 6, characterized in that: Two magnets (335) are fixedly connected to the bottom of the inner cavity of the slot (333), and the iron block (334) is magnetically attracted to the magnets (335).

8. The anti-mis-touch mechanical lock of claim 4, wherein: The card block (332) has a sloping surface (3321) on the side facing the housing (110), and the bottom of the inner cavity of the groove (310) has an arc surface.

Images