Locking device and locking control method for preventing a direct current module from being pulled out while being electrified

Abstract

This invention discloses a locking device and locking control method for preventing the energized removal of a DC module, including a mounting base, a guide structure, an electromagnetic lock assembly, a detection unit, and a control unit. The mounting base is fixed to a mounting frame supporting the DC module, and the guide structure guides the insertion and removal of the DC module. The electromagnetic lock assembly is disposed on the mounting base and includes an electromagnetic lock body and a latch driven by it. The latch is movable between a locked position and an unlocked position. The locked position forms a limiting engagement with the DC module, and the unlocked position releases the limiting engagement. The detection unit detects the power supply status of the DC module and outputs an electrical signal. The control unit controls the electromagnetic lock body according to the electrical signal, driving the latch to the locked position and maintaining it when the DC module is energized, and releasing the locking drive on the latch when the power is off, causing the latch to return to the unlocked position. This device can reduce the risk of arcing and equipment damage caused by the energized removal of the DC module, and allows normal removal after power failure, facilitating maintenance.

Description

Technical Field

[0001] This invention relates to the field of DC power supply equipment technology, and in particular to a locking device and locking control method for preventing a DC module from being pulled out while energized. Background Technology

[0002] In DC power supply systems, DC modules can be used as power supply, rectification, or energy storage units. To meet the needs of fault replacement, repair, and maintenance, DC modules are typically installed in a pluggable manner within a mounting frame and can move relative to the mounting frame along a preset path.

[0003] When a DC module is energized and then removed, an electric arc may occur at the insertion / removal interface, causing damage to connectors, power devices, and other components. This may also be accompanied by insulation damage, short circuits, and safety risks such as fire and electric shock. Therefore, a safe relationship must be maintained between the energized operating state and the insertion / removal state of the DC module.

[0004] In some existing devices, the DC module may be able to move along the insertion / removal direction while energized, posing a risk of being pulled out while energized. Conversely, the DC module may remain restricted from being pulled out even after power is off, making timely removal during maintenance impossible. Furthermore, during continuous operation or changes in power supply status, the restriction status of some devices may not be maintained continuously or can not be released in a timely manner, making it difficult to simultaneously meet the safety restrictions during energized operation and the normal maintenance needs after power failure.

[0005] Therefore, how to reduce the risk of live operation during the removal of DC modules, ensure that the power supply status of DC modules is consistent with their removable status, and take into account both the continuous restrictions during live operation and normal removal after power failure, has become a technical problem that needs to be solved in this field. Summary of the Invention

[0006] The main objective of this invention is to provide a locking device and locking control method to prevent the DC module from being pulled out while energized, so as to solve the above-mentioned technical problems.

[0007] The objective of this invention can be achieved by adopting the following technical solution:

[0008] In a first aspect, the present invention provides a locking device for preventing a DC module from being pulled out while energized, comprising:

[0009] The mounting base is configured to be fixed to the mounting frame that supports the DC module, and the mounting base is provided with a guide structure for guiding the insertion and removal of the DC module;

[0010] An electromagnetic lock assembly is disposed on the mounting base. The electromagnetic lock assembly includes an electromagnetic lock body and a latch driven by the electromagnetic lock body. The latch is movable relative to the guide structure between a locked position and an unlocked position. In the locked position, the latch extends and forms a limiting engagement with the DC module to restrict the movement of the DC module along the guide structure. In the unlocked position, the latch retracts and releases the limiting engagement with the DC module.

[0011] The detection unit is used to detect the power supply status of the DC module and output the corresponding electrical signal;

[0012] The control unit is electrically connected to the detection unit and the electromagnetic lock body, respectively. The control unit is configured to receive the electrical signal and, when the electrical signal indicates that the DC module is energized, control the electromagnetic lock body to drive the bolt to move to the locked position and maintain it in the locked position. When the electrical signal indicates that the DC module is de-energized, control the electromagnetic lock body to release the locking drive on the bolt so that the bolt returns to the unlocked position.

[0013] Secondly, the present invention also provides a locking control method for preventing the DC module from being pulled out while energized, executed by a control unit, comprising: receiving an electrical signal output by a detection unit representing the power supply status of the DC module; determining, based on the electrical signal, whether the DC module is in an energized or de-energized state; when the DC module is determined to be in an energized state, outputting a locking control signal to the electromagnetic lock body, causing the electromagnetic lock body to drive the bolt to move to a locked position and maintain it in the locked position; when the DC module is determined to be in a de-energized state, outputting an unlocking control signal to the electromagnetic lock body, causing the electromagnetic lock body to release the locking drive on the bolt, so that the bolt retracts to the unlocked position.

[0014] Beneficial technical effects of the present invention:

[0015] This invention utilizes a guide structure on the mounting base in conjunction with an electromagnetic lock assembly, allowing the latch of the electromagnetic lock assembly to move between a locked and unlocked position. In the locked position, the latch forms a limiting engagement with the DC module, restricting the DC module's movement along the guide structure. In the unlocked position, the latch retracts and releases the limiting engagement. Simultaneously, a detection unit detects the power supply status of the DC module and outputs a corresponding electrical signal. The control unit controls the electromagnetic lock body's operation based on this signal: when the DC module is energized, the latch is driven to move to the locked position and held there, thereby continuously restricting its removal during energized operation and reducing the risk of arcing, equipment damage, and safety accidents caused by energized removal; when the DC module is de-energized, the locking drive on the latch is released, causing the latch to retract to the unlocked position, releasing the limiting engagement on the DC module, allowing it to be normally removed along the guide structure for easy replacement, inspection, and maintenance. Therefore, this invention improves the consistency between the power supply state and the unpluggable state of the DC module, reduces the reliance on manual judgment and manual locking operations, and takes into account both the safety restrictions during the operation of the DC module under power and the convenience of maintenance after power failure. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional schematic diagram of the device provided in an embodiment of the present invention;

[0018] Figure 2 This is a top view schematic diagram of the device provided in an embodiment of the present invention;

[0019] Figure 3 This is a side view schematic diagram of the device provided in an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the circuit principle in the device provided in the embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the method flow provided in an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] In the diagram: 1-Mounting base, 11-Oval hole, 12-Fasting bolt, 2-Guide structure, 21-Guide wall, 22-Through hole, 3-Electromagnetic lock assembly, 31-Electromagnetic lock body, 32-Lock tongue, 33-Limiting protrusion, 34-Frustum guide section, 35-Reset spring, 41-Voltage sensor, 42-Signal conditioning module, 5-Control unit, 6-DC module, 61-Locking hole, 62-Power supply input terminal, 7-Status indicator module, 71-Locking indicator light, 72-Unlocking indicator light, 8-Auxiliary power supply, 10-Mounting frame. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0026] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0027] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0028] See Figure 1 and Figure 4 This invention provides a locking device to prevent a DC module from being pulled out while energized, for providing energized protection when a DC module 6 is pulled out. The locking device includes a mounting base 1, an electromagnetic lock assembly 3, a detection unit, and a control unit 5.

[0029] Mounting base 1 is configured to be fixed to mounting frame 10 that carries DC module 6, serving as the mounting base for electromagnetic lock assembly 3, detection unit, and control unit 5, and as a fixed reference that remains stationary relative to the insertion and removal movement of DC module 6 when the locking device is in operation. Mounting base 1 is provided with guide structure 2 for guiding the insertion and removal of DC module 6. DC module 6 is inserted or removed along the insertion / removal direction defined by guide structure 2. Guide structure 2 constrains the insertion / removal path of DC module 6 while providing a moving reference for subsequent limiting engagement. Here, the mounting frame carrying DC module 6 can be the cabinet, insertion frame, or mounting structure on which DC module 6 is located; after mounting base 1 is fixed to the mounting frame, a sliding engagement is formed between it and DC module 6 through guide structure 2, meaning DC module 6 can be inserted and removed relative to mounting base 1 along guide structure 2, while mounting base 1 itself does not move with DC module 6. Guide structure 2 can be a guide groove, guide wall, guide rail, or guide frame, etc., capable of constraining DC module 6 to move in a single direction, and is not limited to a specific form.

[0030] The electromagnetic lock assembly 3 is mounted on the mounting base 1 and includes an electromagnetic lock body 31 and a latch 32 driven by the electromagnetic lock body 31. The latch 32 can move between a locked position and an unlocked position relative to the guide structure 2: in the locked position, the latch 32 extends and forms a limiting engagement with the DC module 6 to restrict the movement of the DC module 6 along the guide structure 2, preventing the DC module 6 from being pulled out; in the unlocked position, the latch 32 retracts and releases the limiting engagement with the DC module 6, allowing the DC module 6 to be inserted and removed normally along the guide structure 2. The limiting engagement between the latch 32 and the DC module 6 can be achieved by inserting the end of the latch 32 into the locking hole 61 provided on the DC module 6, or by having the end of the latch 32 engage with the locking groove or bayonet on the DC module 6 to form a limiting engagement. Any engagement form that can prevent the DC module 6 from moving in the insertion / removal direction when the latch 32 extends is acceptable. The electromagnetic lock body 31 is an actuator that can drive the bolt 32 to move back and forth in an electrically controlled manner. For example, it can be an electromagnetic lock that drives the bolt 32 to extend when energized, or it can be an electromagnet that drives the bolt 32 to move by means of an armature. This embodiment does not limit its specific form.

[0031] The detection unit is used to detect the power supply status of the DC module 6 and output a corresponding electrical signal. The power supply status refers to the electrical state that can characterize whether the DC module 6 is currently energized. The detection unit can determine the power supply status by detecting the input voltage of the DC module 6, or by detecting its input current, input power, or other electrical parameters that can reflect whether it is energized or not, as long as it can convert whether the DC module 6 is energized into an electrical signal that can be used for subsequent determination.

[0032] The control unit 5 is electrically connected to both the detection unit and the electromagnetic lock body 31. The control unit 5 is configured to receive electrical signals output by the detection unit and control the electromagnetic lock body 31 according to the power supply state indicated by the electrical signals: when the electrical signals indicate that the DC module 6 is energized, the control unit 5 controls the electromagnetic lock body 31 to drive the latch 32 to the locked position and maintain it there, ensuring that the DC module 6 is continuously locked during the energized period; when the electrical signals indicate that the DC module 6 is de-energized, the control unit 5 controls the electromagnetic lock body 31 to release the latch 32, causing the latch 32 to retract to the unlocked position, thereby releasing the DC module 6. The control unit 5 can be a microcontroller (MCU), a system main controller, or a judgment control circuit composed of a comparison circuit, etc., as long as it can control the on / off state or direction of the electromagnetic lock body 31 based on the electrical signals from the detection unit.

[0033] The following describes the collaborative relationship of each component in conjunction with the working state of the device. When the DC module 6 is inserted and powered on, the detection unit detects that the DC module 6 is energized and outputs a corresponding electrical signal. Based on this, the control unit 5 controls the electromagnetic lock body 31 to drive the latch 32 to move to the locked position. The latch 32 extends and forms a limiting engagement with the DC module 6, confining the DC module 6 within the guide structure 2. At this time, even if the operator makes a mistake, the DC module 6 cannot be pulled out due to the mechanical limitation, thus physically preventing it from being pulled out while energized. When the DC module 6 is de-energized due to a fault or maintenance, the detection unit detects that the DC module 6 is de-energized and outputs a corresponding electrical signal. Based on this, the control unit 5 controls the electromagnetic lock body 31 to release the locking drive of the latch 32, so that the latch 32 returns to the unlocked position. The latch 32 releases the limiting engagement with the DC module 6, and the DC module 6 can be pulled out normally along the guide structure 2 for replacement. Thus, an automatic interlock is established between the electrical state of the DC module 6 and the mechanical locking of the latch 32. Locking and unlocking are both completed automatically by the device based on the power supply status, without the need for operator judgment or manual opening and closing. Since the mounting base 1 is fixed by the mounting frame and remains stationary relative to the insertion and removal movement of the DC module 6, the limiting engagement between the latch 32 and the locking hole 61 can transmit the pulling force on the DC module 6 through the latch 32 and the mounting base 1 to the mounting frame, thereby reliably preventing the DC module 6 from being pulled out while energized.

[0034] Based on the above structural relationship, it can be deduced that the locking device in this embodiment uses the power supply status of the DC module 6 itself as the trigger for locking and unlocking. It automatically locks when energized and automatically releases when de-energized, which fundamentally eliminates the possibility of electric arcs and safety accidents caused by pulling out the energized module, and does not increase the operational burden during normal maintenance. At the same time, it can achieve interlocking by means of the electric control latch 32 of the electromagnetic lock assembly 3 and the cooperation of the detection unit and control unit 5. The structure is relatively simple and easy to adapt to different models and power levels of DC modules 6, with good versatility and low implementation cost.

[0035] See Figure 4 In some optional implementations, the detection unit includes a voltage sensor 41. The voltage sensor 41 is configured to be electrically connected to the power supply input terminal 62 of the DC module 6 and may include a voltage divider sampling circuit composed of resistors R1 and R2 for voltage divider sampling of the input voltage at the power supply input terminal 62. The electrical signal output by the detection unit is the voltage signal characterizing this input voltage. Using the input voltage as a characterizing quantity of the power supply state has a mature signal acquisition method and a clear detection point, making it easy to directly reflect whether the DC module 6 is operating with power.

[0036] Furthermore, the control unit 5 can be preset with a voltage threshold. This voltage threshold is taken as the lowest voltage value of the power supply input terminal 62 when the DC module 6 is in a energized state, or as a judgment value near the lowest voltage value that can reliably distinguish between energized and de-energized states. For example, for a module with a rated input of DC 48V, the voltage threshold can be set to around 36V. For modules with other rated voltage levels, it can be set according to a certain proportion of their rated input voltage. The specific value can be adjusted according to the module specifications and is not limited here. The control unit 5 compares the input voltage corresponding to the voltage signal with the voltage threshold: when the input voltage is greater than or equal to the voltage threshold, it determines that the electrical signal indicates that the DC module 6 is in a energized state, and then controls the electromagnetic lock body 31 to drive the latch 32 to the locked position; when the input voltage is less than the voltage threshold, it determines that the electrical signal indicates that the DC module 6 is in a de-energized state, and then controls the electromagnetic lock body 31 to release the locking drive of the latch 32, so that the latch 32 returns to the unlocked position. Using a threshold comparison method for judgment can avoid misjudgment caused by residual voltage or voltage fluctuations during the power-off process of DC module 6, making the distinction between energized and de-energized states clearer and more reliable.

[0037] In a further implementation, the detection unit may also include a signal conditioning module 42. The signal conditioning module 42 is connected in series between the voltage sensor 41 and the control unit 5; that is, the voltage signal output by the voltage sensor 41 is first processed by the signal conditioning module 42 before being transmitted to the control unit 5. The signal conditioning module 42 is used to filter and buffer the voltage signal output by the voltage sensor 41. Filtering can be achieved using an RC filter circuit composed of resistor R3 and capacitor C1 to remove ripple and interference superimposed on the voltage signal. Buffering can be achieved using a voltage follower composed of operational amplifier U1 to increase the input impedance and reduce the impact of the control unit 5's sampling on the preceding voltage divider and filter circuits. The voltage signal processed by the signal conditioning module 42 is smoother and easier for subsequent sampling, which helps improve the accuracy of the control unit 5 in determining the power supply status, thereby reducing the possibility of malfunction of the latch 32 due to signal interference.

[0038] See Figure 1 In one specific structure, the guide structure 2 includes a guide wall 21 located on the side of the DC module 6. The guide wall 21 extends along the insertion / removal direction of the DC module 6 and guides the side of the DC module 6. The guide wall 21 has a through hole 22. The electromagnetic lock assembly 3 is disposed on the side of the guide wall 21 away from the DC module 6. The locking tongue 32 slides through the through hole 22 and can reciprocate in a direction perpendicular to the guide wall 21 under the guidance of the through hole 22. In the locked position, the locking tongue 32 extends from the through hole 22 to the side of the guide wall 21 facing the DC module 6, and its end is inserted into the locking hole 61 of the DC module 6 to form a limiting fit.

[0039] The latch 32 has a limiting protrusion 33 on the side of the guide wall 21 away from the DC module 6. The limiting protrusion 33 protrudes radially relative to the rod portion of the latch 32. The electromagnetic lock assembly 3 also includes a return spring 35 sleeved on the latch 32. The return spring 35 is a compression spring and abuts against the guide wall 21 and the limiting protrusion 33. That is, one end of the return spring 35 abuts against the wall surface of the guide wall 21 away from the DC module 6, and the other end abuts against the limiting protrusion 33. When the latch 32 moves from the unlocked position to the locked position, that is, extends towards the DC module 6, the limiting protrusion 33 located on the outside of the guide wall 21 moves closer to the guide wall 21 along with the latch 32, thereby compressing the return spring 35 and allowing the return spring 35 to accumulate elastic restoring force. The limiting protrusion 33 can also abut against the guide wall 21 when the return spring 35 returns to its original position, thus limiting the return stroke of the latch 32.

[0040] According to the working state, when the DC module 6 is energized, the control unit 5 controls the electromagnetic lock body 31 to be energized. The electromagnetic lock body 31 drives the latch 32 to move from the unlocked position to the locked position against the elastic force of the return spring 35. The latch 32 extends and inserts into the locking hole 61. At the same time, the return spring 35 is compressed, and the locking device enters the locked state. When the DC module 6 is de-energized, the control unit 5 controls the electromagnetic lock body 31 to be de-energized. The driving force of the electromagnetic lock body 31 on the latch 32 disappears. The compressed return spring 35 drives the limit protrusion 33 along with the latch 32 to retract to the unlocked position by its own elastic force. The latch 32 disengages from the locking hole 61, and the locking device is unlocked. As can be seen, the return spring 35 provides a mechanical restoring force for the retraction of the latch 32, independent of the driving force of the electromagnetic lock body 31. Even when the electromagnetic lock body 31 loses power or the control signal is interrupted, the latch 32 can still reliably retract to the unlocked position under the action of the return spring 35. This ensures that the DC module 6 can be reliably unlocked after power failure, and will not be unable to be maintained due to the latch 32 being stuck in the locked position. This feature of unlocking upon power failure also improves the safety of the device under abnormal power failure conditions. The return spring 35 is not limited to a sleeve-type cylindrical compression spring, but can also be other elastic restoring components that can store energy when the latch 32 extends and drive the latch 32 to retract when the driving force is removed.

[0041] See Figure 1 In some optional implementations, the end of the latch 32 is provided with a frustum guide 34. The axis of the frustum guide 34 is consistent with the moving direction of the latch 32. That is, the frustum guide 34 faces the DC module 6 with its small diameter end and gradually narrows along the extension direction of the latch 32, forming a conical surface at the end of the latch 32. After setting the frustum guide 34, when the DC module 6 is inserted and the latch 32 has not been fully retracted to the unlocked position, the end of the DC module 6 can abut against the conical surface of the frustum guide 34. The force generated by the insertion action is decomposed by the conical surface into a component force that causes the latch 32 to retract, thereby pushing the latch 32 temporarily away from the DC module 6, allowing the DC module 6 to continue to be inserted into place. This avoids the latch 32 and the end of the DC module 6 from jamming each other, which could lead to jamming or structural damage, and improves the fault tolerance and smoothness of insertion and removal. The frustum guide 34 is a non-limiting example of an end guide structure. It can also be replaced by a frustum, a spherical surface, or a single-sided inclined surface, which can form a guide at the end of the latch 32 and guide the latch 32 to retract when inserted.

[0042] See Figure 3In some alternative implementations, the mounting base 1 is provided with an adjustment mechanism, which includes an oblong hole 11 formed in the mounting base 1 and a fastening bolt 12 passing through the oblong hole 11. The oblong hole 11 is an elongated hole extending along its length, with its major axis aligned with the insertion / removal direction of the DC module 6; the fastening bolt 12 passes through the oblong hole 11 and is fastened to the mounting frame that supports the DC module 6, thereby fixing the mounting base 1 to the mounting frame.

[0043] During installation and calibration, with the fastening bolt 12 not fully tightened, the shank of the fastening bolt 12 can slide along its long axis (i.e., along the insertion / removal direction) within the oblong hole 11, allowing the mounting base 1 to translate relative to the mounting frame along the insertion / removal direction to adjust the fixed position of the mounting base 1 on the mounting frame. After adjusting to the position where the locking tongue 32 aligns with the locking hole 61 of the DC module 6 in the insertion / removal direction, the fastening bolt 12 is then tightened to lock the mounting base 1 onto the mounting frame. Since the locking hole 61 of different models and different axial dimensions of the DC module 6 may have different positions in the insertion / removal direction, and the insertion depth of the DC module 6 is usually determined by its power supply docking structure (e.g., a blind-mating connector on the backplate) and is difficult to adjust separately along the insertion / removal direction, the fixed position of the mounting base 1 (along with the locking tongue 32) on the mounting frame can be pre-adjusted by the aforementioned adjustment mechanism, so that the locking tongue 32 of the same locking device can be aligned with the locking hole 61 of different DC modules 6, thereby adapting the same locking device to various specifications of DC modules 6, improving the versatility and ease of installation of the device. The number of waist-shaped holes 11 and fastening bolts 12 is not limited to one set, and multiple sets can be arranged at intervals along the mounting base 1 to enhance the reliability of the fixation.

[0044] As previously mentioned, in addition to using an electromagnetic lock that drives the bolt 32 to extend when energized, the electromagnetic lock body 31 can also be implemented using an electromagnet. The following will further explain this alternative form.

[0045] See Figure 2 In another implementation, the electromagnetic lock body 31 is an electromagnet, and the latch 32 is a pin, which is fixedly connected to the armature of the electromagnet. The electromagnet is located on the side of the guide wall 21 away from the DC module 6. The armature and the pin can reciprocate along the guide direction of the through hole 22. The return spring 35 is still sleeved on the pin and abuts against the guide wall 21 and the limiting protrusion 33. When the control unit 5 determines that the DC module 6 is energized and energizes the electromagnet, the electromagnet generates a magnetic field to attract the armature. The armature drives the pin to overcome the elastic force of the return spring 35 and extend to the locked position. The end of the pin is inserted into the locking hole 61 to form a limiting fit, and at the same time, the return spring 35 is compressed. When the control unit 5 determines that the DC module 6 is de-energized and de-energizes the electromagnet, the magnetic field disappears, the attraction force is removed, and the compressed return spring 35 drives the armature and the pin to return to the unlocked position by its elastic force. The pin disengages from the locking hole 61.

[0046] It is evident that regardless of whether the electromagnetic lock body 31 uses an electromagnetic lock or an electromagnet, it drives the bolt 32 to extend and lock when energized, and drives the bolt 32 to retract and unlock when de-energized using the return spring 35. The locking-unlocking logic is consistent, only the specific form of the electronic drive differs. Providing an electromagnet as an alternative drive form expands the optional implementation of the electromagnetic lock component 3, while also retaining the power-off unlocking characteristic of mechanical reset by the return spring 35 when power is off, ensuring the reliability of power-off unlocking under different drive forms.

[0047] In some alternative implementations, the detection unit includes a current sensor. The current sensor is coupled to the power supply circuit of the DC module 6 and is used to detect the input current of the DC module 6. Based on this, the detection unit outputs an electrical signal characterizing the input current. Correspondingly, a current threshold can be preset in the control unit 5. When the input current is greater than or equal to the current threshold, the DC module 6 is determined to be in a energized state; when the input current is less than the current threshold, it is determined to be in a de-energized state, thereby controlling the electromagnetic lock body 31 to drive the latch 32 to the corresponding position.

[0048] In other alternative implementations, the detection unit can also employ power detection, which involves combining the voltage and current at the power input terminal 62 of the DC module 6 to obtain the input power, and comparing the input power with a preset power threshold to determine whether the DC module 6 is energized. The voltage detection, current detection, and power detection described above are all specific methods of characterizing the power supply status of the DC module 6 using its power supply parameters. Those skilled in the art can choose to use one or a combination of these methods depending on the type of DC module 6 and its power supply conditions. Regardless of the detection method used, the detection unit only needs to convert the energization status of the DC module 6 into an electrical signal for the control unit 5 to determine, which can then cooperate with the electromagnetic lock assembly 3 to achieve interlocking control for energized locking and de-energized unlocking.

[0049] See Figure 2 The locking device may also include a status indication module 7 electrically connected to the control unit 5. The status indication module 7 includes a locking indicator light 71 and an unlocking indicator light 72. The control unit 5 is further configured to: when outputting a locking control signal to the electromagnetic lock body 31, control the locking indicator light 71 to illuminate, indicating that the DC module 6 is currently energized and locked, and cannot be plugged in or removed; when outputting an unlocking control signal to the electromagnetic lock body 31, control the unlocking indicator light 72 to illuminate, indicating that the DC module 6 is currently de-energized and unlocked, and can be plugged in or removed. By using the illumination status of the locking indicator light 71 and the unlocking indicator light 72, the operator can intuitively determine whether each DC module 6 can be plugged in or removed without further judgment, further reducing the possibility of misoperation. The locking indicator light 71 and the unlocking indicator light 72 may be LEDs of different colors, or the same dual-color indicator light may be used to represent the locking and unlocking states with different colors; in addition, a buzzer or other prompting components may be added to provide audible prompts when locking or switching states.

[0050] It should be noted that, in order for the locking device to still detect its status, perform unlocking control, and provide status indication after the DC module 6 is powered off, the locking device should preferably be powered by a power supply independent of the DC module 6 power supply circuit, such as the auxiliary power supply 8 of the DC power supply system, a backup power supply, or an independent battery. In this way, when the DC module 6 is powered off, the control unit 5 and the status indication module 7 can still operate normally. The control unit 5 can then control the electromagnetic lock body 31 to release the locking drive of the bolt 32, causing the bolt 32 to retract and unlock, and illuminating the unlock indicator light 72. The return spring 35 provides mechanical reset when the electromagnetic lock body 31 is de-energized to ensure reliable unlocking.

[0051] In other simplified implementations where cost or size is more critical, the locking device can also be powered from the power supply circuit of the DC module 6: when the DC module 6 is energized, the device is powered, detects and drives the latch 32 to extend for locking, and illuminates the locking indicator 71; when the DC module 6 is de-energized, the device loses power, and the latch 32 mechanically retracts to unlock under the elastic force of the return spring 35. Since the device is de-energized at this time, the unlocking indicator 72 can be omitted accordingly, and only the locking indicator 71 is retained, with the locking indicator 71 illuminating to indicate energized locking and extinguishing to indicate de-energized unlocking.

[0052] Based on the aforementioned locking device, this embodiment of the invention also provides a locking control method to prevent the DC module from being pulled out while energized. This method is executed by the control unit 5 of the locking device to control the electromagnetic lock assembly 3 to automatically lock and unlock according to the power supply status of the DC module 6. The control unit 5, detection unit, electromagnetic lock body 31, latch 32, and their locking and unlocking positions, etc., involved in the following method are all consistent with the aforementioned device embodiment, and their structures will not be repeated.

[0053] See Figure 5 The locking control method for preventing the DC module from being pulled out while energized includes the following steps.

[0054] Step S101: Receive the electrical signal output by the detection unit that represents the power supply status of the DC module.

[0055] This step is continuously executed by control unit 5 after the locking device is put into operation. The detection unit is coupled to DC module 6, converting the current power supply status of DC module 6 into an electrical signal and sending it out. Control unit 5 periodically receives this electrical signal through its signal input port. The power supply status is the electrical state characterizing whether DC module 6 is currently energized. The electrical signal output by the detection unit can be a voltage signal, current signal, or power signal, etc., that reflects whether it is energized or not; this step does not limit its form. It is important to explain the power supply method of control unit 5: to ensure that control unit 5 can continuously receive and process electrical signals whether DC module 6 is energized or de-energized, control unit 5 is powered by a power source independent of the DC module 6's power supply circuit, such as an auxiliary power source or backup power source from the DC power supply system. Therefore, even if DC module 6 is de-energized, control unit 5 can still continue to perform subsequent judgments and control.

[0056] Step S102: Determine whether the DC module is in a powered-on or powered-off state based on the electrical signal.

[0057] After receiving the electrical signal, control unit 5 compares it with preset judgment conditions to determine whether the DC module 6 is currently energized or de-energized. The judgment conditions correspond to the detection method used by the detection unit—when the electrical signal is a voltage signal, a conclusion is reached by comparing it with a preset voltage threshold. The specific comparison method will be explained later in conjunction with the voltage detection implementation. The energization or de-energization conclusion obtained in this step determines whether to proceed to the locking or unlocking branch.

[0058] Step S103: When it is determined that the DC module is energized, a locking control signal is output to the electromagnetic lock body, so that the electromagnetic lock body drives the bolt to move to the locking position and stays in the locking position.

[0059] Once step S102 determines that the DC module 6 is energized, the control unit 5 sends a locking control signal to the electromagnetic lock body 31. The electromagnetic lock body 31 then moves the latch 32 from the unlocked position to the locked position, with the end of the latch 32 extending and inserting into the locking hole 61 of the DC module 6, forming a limiting engagement with the DC module 6. Throughout the entire period when the DC module 6 is continuously energized, the control unit 5 maintains this locking control signal, ensuring that the latch 32 remains stably in the locked position. The emphasis on "maintaining" is because the risk of pulling out the energized module persists throughout the entire energized process; only continuous locking can prevent any accidental operation during the energized period from pulling out the module.

[0060] Step S104: When it is determined that the DC module is in a power-off state, an unlocking control signal is output to the electromagnetic lock body to release the locking drive of the electromagnetic lock body to make the lock tongue return to the unlocked position.

[0061] When step S102 determines that the DC module 6 is de-energized, the control unit 5 sends an unlocking control signal to the electromagnetic lock body 31. The electromagnetic lock body 31 then releases the locking drive on the latch 32, causing the latch 32 to retract from the locked position to the unlocked position and disengage from the locking hole 61. The DC module 6 is then released and can be pulled out normally. Because the control unit 5 is powered by an independent power source, the unlocking control in this step can still be reliably executed even if the DC module 6 is de-energized. Simultaneously, the retraction of the latch 32 can also be accomplished by the elastic force of the return spring 35. Even if the electrical control link malfunctions, the return spring 35 can still drive the latch 32 to retract and unlock, thus providing a double guarantee for unlocking even in the event of a power outage.

[0062] Since this method uses the power supply status of the DC module 6 itself as the control basis for locking and unlocking, the control unit 5 can automatically lock when the module is energized and automatically unlock when the power is off. The operator does not need to judge whether the module is energized or manually open and close the lock. Because locking and unlocking are automatically completed by the control unit 5 according to the real-time power supply status, the energized pulling caused by misoperation is blocked at the control logic level, while normal maintenance after the module is de-energized is not hindered. Furthermore, since the unlocking action is supported by both the active control of the control unit 5 and the mechanical reset of the reset spring 35, this method can still maintain the reliability of unlocking after power failure in abnormal situations such as electrical control failure.

[0063] Regarding step S101, the voltage sensor 41 of the detection unit is electrically connected to the power supply input terminal 62 of the DC module 6, and performs voltage division sampling on the input voltage of the power supply input terminal 62. The electrical signal received by the control unit 5 is the voltage signal characterizing the input voltage. The connection and detection method of the voltage sensor 41 can be found in the voltage detection implementation method of the aforementioned device, and will not be repeated here. Furthermore, the voltage signal received by the control unit 5 in step S101 can also be a voltage signal after being filtered and buffered by the signal conditioning module 42. The specific processing of signal conditioning is also described in the aforementioned related description. In this way, the received voltage signal is smoother and more stable, which helps to reduce the error of subsequent judgment.

[0064] Accordingly, step S102 can be implemented as follows: Step S1021: Compare the input voltage corresponding to the voltage signal with a preset voltage threshold. Step S1022: Determine that the DC module 6 is in a powered-on state when the input voltage is greater than or equal to the voltage threshold, and determine that it is in a powered-off state when the input voltage is less than the voltage threshold. The voltage threshold is taken as the discrimination value near the lower limit that the input voltage can reach when the DC module 6 is powered on, and it serves as the boundary between powered-on and powered-off. The reason for using a threshold comparison instead of simply judging the presence or absence of voltage is that residual voltage and fluctuations often exist during the power-off process of the DC module 6. Setting a threshold can avoid misjudging the power-off transient as powered-on or misjudging slight disturbances as powered-off, making the distinction between powered-on and powered-off states clearer.

[0065] In steps S103 and S104 above, the control unit 5 drives the electromagnetic lock body 31, and thus the latch 32, via the locking control signal and unlocking control signal, according to the electronic and mechanical action sequence. This can be achieved in the following way. See Figure 2 .

[0066] In step S103, the locking control signal is specifically a signal that energizes the electromagnetic lock body 31: after the electromagnetic lock body 31 is energized, it generates a driving force, which drives the latch 32 to overcome the elastic force of the return spring 35 and move from the unlocked position to the locked position. Simultaneously, as the latch 32 extends into the locking hole 61, it compresses the return spring 35, causing the return spring 35 to accumulate elastic restoring force. In step S104, the unlocking control signal is specifically a signal that de-energizes the electromagnetic lock body 31: after the electromagnetic lock body 31 is de-energized, the driving force disappears, and the compressed return spring 35, relying on its own elastic force, drives the latch 32 to retract from the locked position to the unlocked position and disengage from the locking hole 61. Therefore, the mechanical action of unlocking after power failure is actually completed by the return spring 35. In step S104, the control unit 5 de-energizes the electromagnetic lock body 31. This sequence of "locking when energized and resetting by the spring when de-energized" means that the device needs to be continuously energized to maintain the lock when energized, and automatically unlocks without any additional driving force when de-energized, thus unifying the reliability of locking and the security of unlocking after power failure in the same action sequence. For the specific configuration of the locking structure and the return spring 35, please refer to the aforementioned implementation method of the locking structure of the device.

[0067] It should be noted that the above locking control method can be executed in conjunction with status indication. In step S103, while the control unit 5 outputs a locking control signal to the electromagnetic lock body 31, it also controls the locking indicator light 71 to illuminate, indicating that the DC module 6 is energized and locked. In step S104, while outputting an unlocking control signal to the electromagnetic lock body 31, it controls the unlocking indicator light 72 to illuminate, indicating that the DC module 6 is de-energized and unlocked. Since the control unit 5 and the status indication are powered by independent power supplies, the unlocking indicator light 72 can still be illuminated after the DC module 6 is de-energized, thus accurately reflecting the unlocking status. For the specific configuration of the status indication module 7, please refer to the relevant description in the aforementioned device embodiment.

[0068] The following example, using the execution of the locking control method in a DC power supply cabinet, will further illustrate the above method.

[0069] In the DC power supply cabinet, the DC modules 6 in each slot are controlled by their respective control units 5, which execute the aforementioned locking control method. The control unit 5 continuously receives the voltage signal output by the detection unit of its slot (step S101) and compares its corresponding input voltage with the voltage threshold (step S102). When a DC module 6 in a slot is powered on and its input voltage reaches or exceeds the voltage threshold, the control unit 5 of that slot executes step S103, which powers on the electromagnetic lock body 31, extends the latch 32 to insert into the locking hole 61, and illuminates the locking indicator light 71. The module cannot be pulled out while it is powered on. When a DC module 6 in a slot is powered off due to maintenance and its input voltage drops below the voltage threshold, the control unit 5 of that slot executes step S104, which powers off the electromagnetic lock body 31, retracts the latch 32 under the action of the reset spring 35 to unlock, and illuminates the unlock indicator light 72. Maintenance personnel can then safely insert or remove the module, while the remaining slots that are still powered remain locked and do not affect each other.

[0070] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A locking device for preventing a DC module from being pulled out while energized, characterized in that, include: The mounting base is configured to be fixed to the mounting frame that supports the DC module, and the mounting base is provided with a guide structure for guiding the insertion and removal of the DC module; An electromagnetic lock assembly is disposed on the mounting base. The electromagnetic lock assembly includes an electromagnetic lock body and a latch driven by the electromagnetic lock body. The latch is movable relative to the guide structure between a locked position and an unlocked position. In the locked position, the latch extends and forms a limiting engagement with the DC module to restrict the movement of the DC module along the guide structure. In the unlocked position, the latch retracts and releases the limiting engagement with the DC module. The detection unit is used to detect the power supply status of the DC module and output the corresponding electrical signal; The control unit is electrically connected to the detection unit and the electromagnetic lock body, respectively. The control unit is configured to receive the electrical signal and, when the electrical signal indicates that the DC module is energized, control the electromagnetic lock body to drive the bolt to move to the locked position and maintain it in the locked position. When the electrical signal indicates that the DC module is de-energized, control the electromagnetic lock body to release the locking drive on the bolt so that the bolt returns to the unlocked position.

2. The locking device for preventing the DC module from being pulled out while energized, as described in claim 1, is characterized in that, The detection unit includes a voltage sensor configured to be electrically connected to the power supply input terminal of the DC module, and to perform voltage division sampling on the input voltage of the power supply input terminal to output a voltage signal characterizing the input voltage. The electrical signal is the voltage signal. The control unit has a preset voltage threshold. When the input voltage corresponding to the voltage signal is greater than or equal to the voltage threshold, the electrical signal indicates that the DC module is in a energized state. When the input voltage corresponding to the voltage signal is less than the voltage threshold, the electrical signal indicates that the DC module is in a power-off state; the detection unit also includes a signal conditioning module connected in series between the voltage sensor and the control unit, the signal conditioning module is used to filter and buffer the voltage signal output by the voltage sensor, and transmit the processed voltage signal to the control unit.

3. The locking device for preventing the DC module from being pulled out while energized, as described in claim 1, is characterized in that... The guiding structure includes a guide wall located on the side of the DC module, the guide wall having a through hole; the electromagnetic lock assembly is disposed on the side of the guide wall away from the DC module, the lock tongue slides through the through hole, and in the locked position extends from the through hole to the side of the guide wall facing the DC module; the lock tongue has a limiting protrusion on the side of the guide wall away from the DC module, the electromagnetic lock assembly also includes a return spring sleeved on the lock tongue, the return spring being a compression spring and abutting between the guide wall and the limiting protrusion; when the lock tongue moves from the unlocked position to the locked position, the limiting protrusion approaches the guide wall and compresses the return spring.

4. The locking device for preventing the DC module from being pulled out while energized, as described in claim 1, is characterized in that... It also includes a status indicator module electrically connected to the control unit, the status indicator module including a lock indicator light and an unlock indicator light; the control unit is further configured to: control the lock indicator light to illuminate when outputting a lock control signal to the electromagnetic lock body; and control the unlock indicator light to illuminate when outputting an unlock control signal to the electromagnetic lock body.

5. The locking device for preventing the DC module from being pulled out while energized, as described in claim 1, is characterized in that... The mounting base is provided with an adjustment mechanism, which includes an oblong hole in the mounting base and a fastening bolt passing through the oblong hole. The long axis of the oblong hole is aligned with the insertion / removal direction of the DC module. The fastening bolt passes through the oblong hole and is fastened to the mounting frame to fix the mounting base to the mounting frame.

6. The locking device for preventing the DC module from being pulled out while energized, as described in claim 1, is characterized in that, The end of the latch is provided with a frustum guide portion, and the axis of the frustum guide portion is consistent with the moving direction of the latch.

7. A locking control method for preventing the energized removal of a DC module, characterized in that, Performed by the control unit, including: Receive the electrical signal output from the detection unit that represents the power supply status of the DC module; The DC module is determined to be either energized or de-energized based on the electrical signal. When it is determined that the DC module is energized, a locking control signal is output to the electromagnetic lock body, causing the electromagnetic lock body to drive the bolt to move to the locking position and remain in the locking position. When it is determined that the DC module is in a power-off state, an unlocking control signal is output to the electromagnetic lock body, so that the electromagnetic lock body releases the locking drive on the bolt, and the bolt returns to the unlocked position.

8. The locking control method for preventing the DC module from being pulled out while energized, as described in claim 7, is characterized in that... The electrical signal is a voltage signal, which is output by a voltage sensor electrically connected to the power supply input terminal of the DC module after voltage division and sampling of the input voltage at the power supply input terminal; The electrical signal output by the receiving detection unit includes: receiving the voltage signal after filtering and buffering by the signal conditioning module; determining whether the DC module is in a powered-on or powered-off state based on the electrical signal includes: comparing the input voltage corresponding to the voltage signal with a preset voltage threshold; determining that the DC module is in a powered-on state when the input voltage is greater than or equal to the voltage threshold; and determining that the DC module is in a powered-off state when the input voltage is less than the voltage threshold.

9. The locking control method for preventing the DC module from being pulled out while energized, as described in claim 7, is characterized in that: The output locking control signal includes energizing the electromagnetic lock body to drive the bolt to move from the unlocked position to the locked position and compress the return spring; The output unlocking control signal includes de-energizing the electromagnetic lock body so that the reset spring drives the bolt to retract from the locked position to the unlocked position.

10. The locking control method for preventing the DC module from being pulled out while energized, as described in claim 7, is characterized in that... Also includes: When the locking control signal is output, the locking indicator light is turned on. When the unlock control signal is output, the unlock indicator light is turned on.

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