CN113911147B - Locomotive and mechanical delay safety interlocking system and method - Google Patents

Abstract

The invention discloses a locomotive and a mechanical time delay safety interlocking system and method, comprising a mechanical time delay safety device; the mechanical time delay safety device comprises an interlock logic module, a time delay module, a first lock cylinder, a second lock cylinder, Key A and key B; key A is fixedly connected with the locomotive power supply key, and key B is fixedly connected with the cabinet door key of the high-voltage electrical panel; the interlocking logic module is used for only key A or key B to be pulled out in each operation; The delay module is used when the key A is inserted into the first lock cylinder, and the key B can be pulled out after the delay time expires; when the locomotive is powered off, pull out the locomotive power supply key and insert the key A into the first lock cylinder. When the time function is activated, the key B can only be pulled out after the delay time expires, and the capacitor equipment can be continuously discharged by the delay time, and the voltage in the high-voltage electrical panel cabinet is reduced to the human-safe operating voltage, which ensures that the operator has no problem with the high-voltage electrical panel. Safety during cabinet operation.

Description

A locomotive and mechanical time delay safety interlocking system and method

technical field

The invention belongs to the technical field of control between various equipments of a locomotive, and in particular relates to a delay interlocking system and method for the safe operation of a high-voltage electrical panel cabinet after the locomotive is powered off.

Background technique

In the high-voltage electrical system panel cabinet equipped with the locomotive, capacitor equipment is generally installed in the intermediate DC circuit. After the locomotive is powered off, the capacitor will have a continuous discharge time ranging from 5 to 8 minutes to reduce the voltage level in the electrical panel cabinet. Below the safe operating voltage of the human body (<36V).

For example, locomotive traction converter cabinets and DCDC cabinets are equipped with capacitive devices. According to Article 8.3.2 of EN50153-2014, if there are capacitive discharge components in the panel cabinet, the voltage in the cabinet needs to be reduced to below the safe voltage (60V) within the specified time to ensure the safety of operators. Once the equipment cabinet that is not discharged to the safe voltage is operated, it is easy to cause personal injury to the operator and cause a safety accident.

By analyzing the relevant voltage safety protection schemes in recent years, most of the high-voltage electrical panels with capacitive equipment have not been subjected to voltage detection and effective safety protection after power failure. The existing safety interlock scheme needs to be equipped with grounding switches, interlock key boxes, etc., which increases the electrical and wiring workload and the complexity of on-site implementation; the operation steps of the interlock key box are cumbersome, and at least 4 keys are required to achieve safety Interlocking function, and the interlocking key box takes up more space available on the locomotive, and the cost is higher.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a locomotive and mechanical time-delay safety interlocking system and method to solve the problem of operation safety caused by the failure of discharge to the safe voltage range of the high-voltage electrical panel cabinet installed with capacitive equipment after the locomotive is powered off, and the current There are the problems of complicated operation steps, large space occupation and high cost of the interlocking scheme.

The present invention solves the above technical problems through the following technical solutions: a mechanical time delay safety interlocking system, comprising a mechanical time delay safety device arranged in a driver's cab; the mechanical time delay safety device includes an interlock logic module, A delay module, a first lock cylinder, a second lock cylinder, a key A matching the first lock cylinder, and a key B matching the second lock cylinder; the key A is fixedly connected with the locomotive power supply key, so The key B is fixedly connected with the cabinet door key of the high-voltage electrical panel cabinet; the interlocking logic module is used to only pull out the key A from the first lock cylinder or the key B from the second lock cylinder during each operation ; The delay module is used for when the key A is inserted into the first lock cylinder, the key B can only be pulled out from the second lock cylinder after the delay time expires.

In the present invention, the locomotive power supply key needs to be used when the locomotive is running normally, and the key A is fixedly connected with the locomotive power supply key. At this time, the key A is pulled out to use the locomotive power supply key to ensure the normal operation of the locomotive; Lock logic function, only one key can be pulled out from the mechanical delay safety device for each operation, so the key B cannot be pulled out from the second lock cylinder, and the key B is fixedly connected with the cabinet door key of the high-voltage electrical panel cabinet. Therefore, during the normal operation of the locomotive, the key B cannot be pulled out due to the interlocking logic function, and thus the high-voltage electrical panel cabinet cannot be operated; when the locomotive is powered off, the locomotive power supply key can be pulled out, and the key A can be inserted into the first lock cylinder, Due to the delay function of the delay module, it is necessary to pull out the key B from the second lock cylinder after the delay time expires, so as to use the cabinet door key to open the high-voltage electrical panel cabinet. During the delay time after the locomotive is powered off, The capacitor equipment discharges continuously, reducing the voltage in the high-voltage electrical panel to the safe operating voltage of the human body, ensuring the safety of the operator when operating the high-voltage electrical panel.

The system does not need to increase the workload of electrical wiring, and is easy to implement; the mechanical delay safety device is small in size, occupies a small space, and has low cost. It only needs two keys to realize the safety interlock function, which is simple to operate and has high safety.

Further, the high-voltage electrical panel is a traction converter panel and/or a DCDC panel.

Further, the fixed connection methods are all welding.

Further, the system also includes a sensor for detecting the voltage of the capacitive equipment in the high-voltage electrical panel cabinet, and an electronic lock at the door lock core of the high-voltage electrical panel cabinet; the sensor and the electronic lock are both electrically connected to the controller ; The electronic lock is used to connect with the lock cylinder of the cabinet door when the voltage of the capacitor device is greater than the safe operating voltage, so that the cabinet door cannot be opened.

Further, the system further includes an indicator light electrically connected to the controller; the indicator light is used to display red when the voltage of the capacitive device is greater than the safe operating voltage, and display green when the voltage of the capacitive device is less than or equal to the safe operating voltage .

The present invention also provides a method for using the above-mentioned mechanical time-delayed safety interlocking system for safety interlocking control, comprising the following steps:

Step 1: Power off the locomotive, pull out the locomotive power supply key;

Step 2: Insert the key A fixedly connected with the locomotive power supply key into the first lock cylinder;

Step 3: After the delay time is over, pull out the key B from the second lock cylinder;

Step 4: Insert the cabinet door key of the high-voltage electrical panel cabinet fixedly connected with the key B into the cabinet door lock cylinder to open the cabinet door of the high-voltage electrical panel cabinet.

Further, in the step 3, the delay time is 8min.

Further, after the step 3, before the step 4, it also includes:

Detecting the voltage of the capacitor equipment in the high-voltage electrical panel cabinet;

When the voltage of the capacitive device is greater than the safe operating voltage, the electronic lock is connected to the lock cylinder of the cabinet door;

When the voltage of the capacitive device is less than or equal to the safe operating voltage, the electronic lock is not connected to the lock cylinder of the cabinet door.

Further, after the step 3, before the step 4, it also includes:

Check to see if the light is green, if so, go to step 4, otherwise wait for the light to turn green.

The present invention also provides a locomotive comprising the above-mentioned mechanical time-delay safety interlock system.

beneficial effect

Compared with the prior art, the beneficial effects of the present invention are:

1. The interlocking of the locomotive power off and the discharge of the high-voltage electrical panel cabinet to a safe voltage range can be realized through the mechanical delay safety equipment, which ensures the safety of the operator when operating the high-voltage electrical panel cabinet; the system and method do not require additional electrical The wiring workload is easy to implement; the mechanical delay safety equipment is small in size, occupies a small space, and has a low cost. It only needs two keys to realize the safety interlock function, which is easy to operate and has high safety;

2. The electronic lock further ensures the safety of the operator when operating the high-voltage electrical panel cabinet after the locomotive is powered off;

3. The indicator light further ensures the safety of the operator when operating the high-voltage electrical panel cabinet after the locomotive is powered off, and constitutes triple protection with electronic locks and mechanical delay safety equipment to ensure that when the operator operates the high-voltage electrical panel cabinet , the locomotive has been powered off and the capacitive equipment in the high-voltage electrical panel has been discharged to the safe voltage range.

Description of drawings

In order to illustrate the technical solutions of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only an embodiment of the present invention, which is very important in the art. For those of ordinary skill, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is a structural block diagram of a mechanical time-delayed safety interlocking system in Embodiment 1 of the present invention;

Fig. 2 is the fixed connection diagram of the key A and the locomotive power supply key in Embodiment 1 of the present invention;

Fig. 3 is the fixed connection diagram of key B and the cabinet door key in Embodiment 1 of the present invention;

Fig. 4 is the flow chart of the safety interlocking control method in Embodiment 1 of the present invention;

FIG. 5 is a flowchart of a safety interlock control method in Embodiment 2 of the present invention.

Among them, 1- mechanical delay safety equipment, 11- key A, 12- key B, 2- locomotive power supply key, 3- cabinet door key.

Detailed ways

The technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

The technical solutions of the present application will be described in detail below with specific examples. The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

Example 1

As shown in FIG. 1 , a mechanical time delay safety interlocking system provided in this embodiment includes a mechanical time delay safety device 1 located in the driver’s cab; the mechanical time delay safety device 1 includes an interlock logic module and a time delay module. , a first lock cylinder, a second lock cylinder, a key A 11 matched with the first lock cylinder, and a key B 12 matched with the second lock cylinder. The key A 11 is fixedly connected to the locomotive power supply key 2, as shown in FIG. 2, and the key B 12 is fixedly connected to the cabinet door key 3 of the high-voltage electrical panel cabinet, as shown in FIG. 3.

The interlocking logic module is used to pull out only the key A 11 from the first lock cylinder or the key B 12 from the second lock cylinder in each operation, that is, when the key A 11 is pulled out from the first lock cylinder, The key B 12 cannot be pulled out from the second lock cylinder; or after the key B 12 is pulled out from the second lock cylinder, the key A 11 cannot be pulled out from the first lock cylinder. The delay module is used for when the key A 11 is inserted into the first lock cylinder, the key B 12 can only be pulled out from the second lock cylinder after the delay time expires. In this embodiment, the delay time can be set according to the time required for the capacitor device to reduce the voltage in the high-voltage electrical panel cabinet to below the safe operating voltage of the human body through discharge.

The key A 11 and the key B 12 are respectively inserted into the first lock cylinder and the second lock cylinder. Since the key A 11 is fixedly connected with the locomotive power supply key 2, when the locomotive power supply key 2 is needed for the normal operation of the locomotive, the key A must be 11 Pull out from the first lock cylinder to insert the locomotive power supply key 2 into the position of the cab power supply key, and the locomotive runs normally. At this time, due to the interlock logic function, the key B 12 cannot be pulled out from the second lock cylinder. When the high-voltage electrical panel cabinet is opened, the operator cannot repair the high-voltage electrical panel cabinet, and effectively protects the high-voltage electrical panel cabinet when the locomotive is not powered off. When the high-voltage electrical panel cabinet needs to be repaired after the locomotive is powered off, pull out the locomotive power supply key 2 to ensure that the locomotive is powered off before inserting the key A11 into the first lock cylinder. The key B 12 can only be pulled out from the second lock cylinder after the time has elapsed. During the period from the power failure of the locomotive to the end of the delay time, the capacitive equipment in the high-voltage electrical panel continues to discharge, which reduces the voltage of the high-voltage electrical panel. When the voltage is below the safe operation voltage of human body, insert the cabinet door key 3 into the lock cylinder of the cabinet door, open the high-voltage electrical panel cabinet door, and repair the high-voltage electrical panel cabinet, which ensures the safety of the operator when operating the high-voltage electrical panel cabinet.

The system only needs the mechanical delay safety device 1 to realize the interlocking control of the locomotive power off and the discharge of the high-voltage electrical panel cabinet to below the safe operating voltage. It not only ensures the operation safety of the locomotive when the power is cut off, but also ensures the operation safety of the locomotive when the power is not cut off. The mechanical time delay safety device 1 occupies a small space and has a low cost.

In this embodiment, the high-voltage electrical panel is a traction converter panel and/or a DCDC panel. Fixed connection methods include but are not limited to welding.

Install a voltage sensor on the capacitive equipment of the high-voltage electrical panel cabinet, and the voltage sensor is used to detect the voltage of the capacitor device; install an electronic lock on the lock core of the high-voltage electrical panel cabinet door; install an indicator light on the high-voltage electrical panel cabinet; voltage sensor, electronic lock and the indicator light are all electrically connected to the controller; the controller is used to obtain the voltage of the capacitor device and determine whether the voltage of the capacitor device is less than or equal to the safe operating voltage, if so, the control electronic lock is not connected to the lock cylinder of the cabinet door, and the indicator light is green; Otherwise, the control electronic lock is connected with the lock cylinder of the cabinet door, and the indicator light is red.

That is, when the voltage of the capacitive equipment is less than or equal to the safe operating voltage, it means that the maintenance operation of the high-voltage electrical panel cabinet can be performed. At this time, the electronic lock is not connected to the lock cylinder of the cabinet door, and the cabinet door of the high-voltage electrical panel cabinet can be opened through the cabinet door key 3. The indicator light is green; when the voltage of the capacitor equipment is greater than the safe operating voltage, it means that the voltage has not dropped below the safe operating voltage, and the maintenance operation of the high-voltage electrical panel cabinet cannot be performed. The key 3 cannot open the cabinet door of the high-voltage electrical panel cabinet, and the indicator light is red. The safety of the operation of the high-voltage electrical panel is further ensured by indicator lights and electronic locks.

As shown in FIG. 4 , this embodiment also provides a method for performing safety interlock control using the mechanical time delay safety interlock system described in Embodiment 1, comprising the following steps:

Step 1: Power off the locomotive, pull out the locomotive power supply key 2.

Step 2: Insert the key A 11 fixedly connected with the locomotive power supply key 2 into the first lock cylinder on the mechanical time delay safety device 1, and the key B 12 cannot be pulled out at this time.

Step 3: The delay module starts timing, and after the delay time expires, pull out the key B 12 from the second lock cylinder. During the delay time, the capacitor equipment of the high-voltage electrical panel will reduce the voltage level to below the safe operating voltage of the human body through continuous discharge.

The delay time can be set according to the time it takes for the capacitive device to drop the voltage in the high-voltage electrical panel cabinet below the safe operating voltage of the human body by discharging. In this embodiment, the delay time is 8 minutes.

Step 4: Obtain the voltage of the capacitive equipment in the high-voltage electrical panel cabinet. When the voltage of the capacitive equipment is greater than the safe operating voltage, the electronic lock is connected to the lock cylinder of the cabinet door, and the indicator light is red; when the voltage of the capacitive equipment is less than or equal to the safe operating voltage, the electronic lock The lock is not connected to the lock cylinder of the cabinet door, and the indicator light is green.

The voltage of the capacitive device is detected according to the sampling period of the sensor. The detection of the voltage of the capacitive device is real-time and continuous. Therefore, the acquisition of the voltage of the capacitive device and the judgment between the voltage of the capacitive device and the safe operation voltage are always in progress, not in step 4. That is, in step 4, the acquisition of the voltage of the capacitor device, the judgment of the voltage of the capacitor device and the safe operation voltage, and the control of the electronic lock and the indicator light are not in the order of steps 1 to 3.

Step 5: Check whether the indicator light on the high-voltage electrical panel is green, if yes, it means the voltage has dropped below the human-safe operating voltage, go to step 6, otherwise the voltage has not dropped below the human-safe operating voltage, wait for the instruction The light turns green.

When the voltage of the capacitive device is greater than the safe operating voltage, the indicator light is red, and the electronic lock is connected to the lock cylinder of the cabinet door, and the cabinet door cannot be opened even with the cabinet door key 3; when the voltage of the capacitive device is less than or equal to the safe operating voltage, the indicator light It is green, and the electronic lock is not connected to the lock cylinder of the cabinet door, the cabinet door can be opened with the cabinet door key 3. The electronic lock acts as the last barrier to ensure the safety of operation, avoiding the safety problem of the operator operating the high-voltage electrical panel cabinet when the indicator light is red. Even if the operator operates the high-voltage electrical panel cabinet when the indicator light is red, it is also because The electronic lock cannot open the cabinet door, which ensures safety. The indicator light can give the operator a more intuitive indication.

Step 6: Insert the cabinet door key 3 of the high-voltage electrical panel cabinet that is fixedly connected to the key B 12 into the cabinet door lock cylinder, and turn the cabinet door key 3. If it can be turned, it means that the voltage has dropped below the safe operating voltage of the human body. The electronic lock is not connected with the lock cylinder of the cabinet door. When the cabinet door is opened, the high-voltage electrical panel cabinet can be repaired; if it cannot be turned, it means that the voltage has not dropped below the safe operating voltage of the human body, and the indicator light is faulty. Personnel report failure.

If the indicator light is green, it indicates that the voltage of the capacitor equipment is less than or equal to the safe operating voltage. The electronic lock should not be connected to the lock cylinder of the cabinet door. If the indicator light is green, the cabinet door cannot be opened, indicating that the indicator light is green and there is a fault. The electronic lock is the last A barrier ensures that the protective function of operational safety is effective.

Example 2

As shown in FIG. 1 , a mechanical time delay safety interlocking system provided in this embodiment includes a mechanical time delay safety device 1 located in the driver’s cab; the mechanical time delay safety device 1 includes an interlock logic module and a time delay module. , a first lock cylinder, a second lock cylinder, a key A 11 matched with the first lock cylinder, and a key B 12 matched with the second lock cylinder. The key A 11 is fixedly connected to the locomotive power supply key 2, as shown in FIG. 2, and the key B 12 is fixedly connected to the cabinet door key 3 of the high-voltage electrical panel cabinet, as shown in FIG. 3.

The interlocking logic module is used to pull out only the key A 11 from the first lock cylinder or the key B 12 from the second lock cylinder in each operation, that is, when the key A 11 is pulled out from the first lock cylinder, The key B 12 cannot be pulled out from the second lock cylinder; or after the key B 12 is pulled out from the second lock cylinder, the key A 11 cannot be pulled out from the first lock cylinder. The delay module is used for when the key A 11 is inserted into the first lock cylinder, the key B 12 can only be pulled out from the second lock cylinder after the delay time expires.

Install a voltage sensor on the capacitive equipment of the high-voltage electrical panel cabinet, and the voltage sensor is used to detect the voltage of the capacitive equipment; install an electronic lock at the lock core of the high-voltage electrical panel cabinet door; the voltage sensor and the electronic lock are both electrically connected to the controller; In order to obtain the voltage of the capacitor device, it is judged whether the voltage of the capacitor device is less than or equal to the safe operating voltage. If so, the electronic lock is controlled not to be connected to the lock cylinder of the cabinet door; otherwise, the electronic lock is controlled to be connected to the lock cylinder of the cabinet door.

As shown in FIG. 5 , this embodiment also provides a method for performing safety interlock control using the mechanical time delay safety interlock system described in Embodiment 2, including the following steps:

Step 1: Power off the locomotive, pull out the locomotive power supply key 2.

Step 2: Insert the key A 11 fixedly connected with the locomotive power supply key 2 into the first lock cylinder on the mechanical time delay safety device 1, and the key B 12 cannot be pulled out at this time.

Step 3: The delay module starts timing, and after the delay time expires, pull out the key B 12 from the second lock cylinder. During the delay time, the capacitor equipment of the high-voltage electrical panel will reduce the voltage level to below the safe operating voltage of the human body through continuous discharge.

The delay time can be set according to the time it takes for the capacitive device to drop the voltage in the high-voltage electrical panel cabinet below the safe operating voltage of the human body by discharging. In this embodiment, the delay time is 8 minutes.

Step 4: Obtain the voltage of the capacitive equipment in the high-voltage electrical panel cabinet. When the voltage of the capacitive equipment is greater than the safe operating voltage, the electronic lock is connected to the lock cylinder of the cabinet door; when the voltage of the capacitive equipment is less than or equal to the safe operating voltage, the electronic lock is connected to the lock cylinder of the cabinet door not connected.

Step 5: Insert the cabinet door key 3 of the high-voltage electrical panel cabinet fixedly connected with the key B 12 into the cabinet door lock cylinder to open the cabinet door of the high-voltage electrical panel cabinet.

If the voltage of the capacitive equipment is greater than the safe operating voltage, the electronic lock is connected to the lock cylinder of the cabinet door, and the cabinet door of the high-voltage electrical panel cabinet cannot be opened, ensuring the safety of operation.

Example 3

As shown in FIG. 1 , a mechanical time delay safety interlocking system provided in this embodiment includes a mechanical time delay safety device 1 located in the driver’s cab; the mechanical time delay safety device 1 includes an interlock logic module and a time delay module. , a first lock cylinder, a second lock cylinder, a key A 11 matched with the first lock cylinder, and a key B 12 matched with the second lock cylinder. The key A 11 is fixedly connected to the locomotive power supply key 2, as shown in FIG. 2, and the key B 12 is fixedly connected to the cabinet door key 3 of the high-voltage electrical panel cabinet, as shown in FIG. 3.

The interlocking logic module is used to pull out only the key A 11 from the first lock cylinder or the key B 12 from the second lock cylinder in each operation, that is, when the key A 11 is pulled out from the first lock cylinder, The key B 12 cannot be pulled out from the second lock cylinder; or after the key B 12 is pulled out from the second lock cylinder, the key A 11 cannot be pulled out from the first lock cylinder. The delay module is used for when the key A 11 is inserted into the first lock cylinder, the key B 12 can only be pulled out from the second lock cylinder after the delay time expires.

Install a voltage sensor on the capacitive equipment of the high-voltage electrical panel cabinet, and the voltage sensor is used to detect the voltage of the capacitive equipment; install an indicator light on the high-voltage electrical panel cabinet; the voltage sensor and indicator light are both electrically connected to the controller; the controller is used to obtain the voltage of the capacitive device , judge whether the voltage of the capacitor device is less than or equal to the safe operating voltage, if so, the indicator light is green; otherwise, the indicator light is red.

This embodiment also provides a method for performing safety interlock control using the mechanical time delay safety interlock system as described in Embodiment 3, comprising the following steps:

Step 1: Power off the locomotive, pull out the locomotive power supply key 2.

Step 2: Insert the key A 11 fixedly connected with the locomotive power supply key 2 into the first lock cylinder on the mechanical time delay safety device 1, and the key B 12 cannot be pulled out at this time.

Step 3: The delay module starts timing, and after the delay time expires, pull out the key B 12 from the second lock cylinder. During the delay time, the capacitor equipment of the high-voltage electrical panel will reduce the voltage level to below the safe operating voltage of the human body through continuous discharge.

The delay time can be set according to the time it takes for the capacitive device to drop the voltage in the high-voltage electrical panel cabinet below the safe operating voltage of the human body by discharging. In this embodiment, the delay time is 8 minutes.

Step 4: Obtain the voltage of the capacitive equipment in the high-voltage electrical panel cabinet. When the voltage of the capacitive equipment is greater than the safe operating voltage, the indicator light is red; when the voltage of the capacitive equipment is less than or equal to the safe operating voltage, the indicator light is green.

Step 5: Check whether the indicator light is green. When the indicator light is green, insert the cabinet door key 3 of the high-voltage electrical panel cabinet fixedly connected with the key B 12 into the lock cylinder of the cabinet door, and open the cabinet door of the high-voltage electrical panel cabinet; When the indicator light is red, wait for the indicator light to turn green. If the waiting time is less than or equal to the waiting time threshold, the cabinet door will be opened after the indicator light turns green. If the waiting time is greater than the waiting time threshold, a fault will be reported.

The above disclosure is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited to this. should be included within the protection scope of the present invention.

Claims (10)

1. A mechanical time delay safety interlock system characterized by: the safety device comprises mechanical delay safety equipment arranged in a cab; the mechanical delay safety device comprises an interlocking logic module, a delay module, a first lock cylinder, a second lock cylinder, a key A matched with the first lock cylinder and a key B matched with the second lock cylinder; the key A is fixedly connected with a locomotive power supply key, and the key B is fixedly connected with a cabinet door key of the high-voltage electric screen cabinet; the interlocking logic module is used for only extracting the key A from the first lock cylinder or extracting the key B from the second lock cylinder in each operation; and the time delay module is used for enabling the key B to be pulled out of the second lock cylinder after the time delay time is over when the key A is inserted into the first lock cylinder.

2. The mechanical time delay safety interlock system of claim 1, wherein: the high-voltage electric screen cabinet is a traction converter screen cabinet and/or a DCDC screen cabinet.

3. The mechanical time delay safety interlock system of claim 1, wherein: the fixed connection mode is welding.

4. The mechanical time delay safety interlock system of any one of claims 1 to 3, wherein: the high-voltage electric cabinet door lock also comprises a sensor for detecting the voltage of capacitance equipment in the high-voltage electric cabinet and an electronic lock at the lock cylinder of the high-voltage electric cabinet door; the sensor and the electronic lock are both electrically connected with the controller; and the electronic lock is used for being connected with the cabinet door lock core when the voltage of the capacitance equipment is greater than the safe operation voltage, so that the cabinet door cannot be opened.

5. The mechanical time delay safety interlock system of claim 4, wherein: the device also comprises an indicator light electrically connected with the controller; the indicator light is used for displaying red when the voltage of the capacitor equipment is greater than the safe operation voltage, and displaying green when the voltage of the capacitor equipment is less than or equal to the safe operation voltage.

6. A method of safety interlock control using a mechanical time delay safety interlock system as claimed in any one of claims 1 to 5, comprising the steps of:

step 1: the locomotive is powered off, and a locomotive power supply key is pulled out;

step 2: inserting a key A fixedly connected with the locomotive power supply key into a first lock cylinder;

and step 3: after the time delay is finished, pulling out the key B from the second lock cylinder;

and 4, step 4: and inserting a cabinet door key of the high-voltage electric screen cabinet fixedly connected with the key B into a cabinet door lock cylinder to open a cabinet door of the high-voltage electric screen cabinet.

7. The method of claim 6, wherein in step 3, the delay time is 8min.

8. The method of claim 6 or 7, wherein after step 3, step 4 is preceded by:

detecting the voltage of capacitance equipment in the high-voltage electrical screen cabinet;

when the voltage of the capacitor equipment is greater than the safe operation voltage, the electronic lock is connected with the cabinet door lock core;

and when the voltage of the capacitor equipment is less than or equal to the safe operation voltage, the electronic lock is not connected with the cabinet door lock core.

9. The method of claim 6 or 7, wherein after step 3, step 4 is preceded by:

and checking whether the indicator light is green, if so, turning to the step 4, otherwise, waiting for the indicator light to turn green.

10. A locomotive, characterized by: comprising a mechanical time delay safety interlock system as claimed in any one of claims 1 to 5.

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