Electricity testing and grounding integrated device for subway overhead line system and electricity testing and grounding detection method

Abstract

The invention discloses a subway overhead line system electricity testing and grounding integrated device which comprises a double-tongue hook, one end of the double-tongue hook is fixedly sleeved with a first metal cylinder, one end, away from the double-tongue hook, of the first metal cylinder is provided with a first insulating rod in a penetrating mode, the first insulating rod is connected with the double-tongue hook, and the diameter of the first insulating rod is smaller than the inner diameter of the end, away from the double-tongue hook, of the first metal cylinder. An electroscope, a current-limiting resistor and a locking switch are arranged in the first insulating rod, one end, far away from the double-tongue hook, of the first insulating rod is connected with a second insulating rod through a connecting assembly, and one end, far away from the first insulating rod, of the second insulating rod is in threaded connection with a third insulating rod; the connecting assembly is also connected with a grounding wire; the invention also provides a method for carrying out electricity testing and grounding detection by using the electricity testing and grounding integrated device for the subway overhead line system. According to the electricity testing and grounding integrated device for the subway overhead line system, the problem that an electricity testing circuit and a grounding wire hanging circuit are inconsistent in the prior art during power failure maintenance operation is solved.

Description

Technical Field

[0001] This invention belongs to the technical field of subway safety tools and equipment, specifically relating to an integrated device for testing and grounding electrical contact networks in subways, and also to a method for testing and grounding electrical contact networks using the aforementioned integrated device. Background Technology

[0002] During power outage maintenance of subway overhead contact lines, voltage testing and grounding wire installation are essential steps and crucial measures to ensure safe operation. Currently, when temporarily installing grounding wires on subway overhead contact lines, a voltage tester is first used to confirm the power outage before installing the grounding wire. During this process, maintenance personnel need to change tools, and if they are negligent, the voltage testing circuit and the grounding wire circuit can easily become inconsistent, leading to the grounding wire being mistakenly installed on an adjacent live power line, potentially causing a safety accident. Summary of the Invention

[0003] The purpose of this invention is to provide an integrated device for testing and grounding the contact network of a subway, which solves the problem of inconsistent connection between the testing line and the grounding line in the existing technology during power outage maintenance.

[0004] The second objective of this invention is to provide a method for conducting grounding detection using the aforementioned integrated grounding and electrical testing device for subway overhead contact lines.

[0005] The first technical solution adopted in this invention is an integrated device for testing and grounding the contact network of a subway, including a double-tongue hook. A first metal cylinder is fixedly sleeved on one end of the double-tongue hook. A first insulating rod passes through the end of the first metal cylinder away from the double-tongue hook. The end of the first insulating rod near the double-tongue hook is fixedly set in the middle of the inner wall of the first metal cylinder. The diameter of the first insulating rod is smaller than the inner diameter of the end of the first metal cylinder away from the double-tongue hook. An electroscope, a current-limiting resistor and a locking switch are respectively provided inside the first insulating rod. A second insulating rod is connected to the end of the first insulating rod away from the double-tongue hook through a connecting component. A third insulating rod is screwed to the end of the second insulating rod away from the first insulating rod.

[0006] The connection component is also connected to a grounding wire.

[0007] The invention is further characterized by:

[0008] The voltage detector is located inside the first insulating rod near the end of the double-tongue hook, the locking switch is located inside the first insulating rod away from the end of the double-tongue hook, the current-limiting resistor is located between the voltage detector and the locking switch, and the grounding terminal of the current-limiting resistor is connected to the connecting assembly via the grounding lead.

[0009] The input signal terminal of the electroscope is connected to the double-tongue hook via a wire, that is, the double-tongue hook 1 serves as the contact electrode of the electroscope 4. The ground of the electroscope is connected to the current-limiting resistor via a wire, and the other end of the current-limiting resistor is connected to the connecting component via a grounding lead. The output terminal of the electroscope is also connected to the interlocking switch via a signal line.

[0010] The connecting assembly includes a metal connector connected to the end of the first insulating rod away from the double-tongue hook. The outer side of the end of the metal connector away from the first insulating rod is provided with a first external thread. The outer diameter of the first external thread is larger than the outer diameter of the first insulating rod, and the outer diameter of the first external thread is smaller than the inner diameter of the second insulating rod.

[0011] It also includes a second metal cylinder, which is disposed at the end of the second insulating rod close to the first insulating rod. The inner side of the second metal cylinder is provided with a first internal thread that mates with the first external thread. The first internal thread on the second metal cylinder is screwed to the first external thread on the metal connector. The outer side of the second metal cylinder is also provided with a second external thread. The inner side of the end of the first metal cylinder away from the double tongue hook is provided with a second internal thread that mates with the second external thread.

[0012] A metal screw is also vertically installed on the outer wall of the second metal cylinder, and the grounding wire is sleeved on the metal screw through a metal ring.

[0013] The grounding terminal of the current-limiting resistor is connected to the end of the metal connector near the interlocking switch via a grounding lead.

[0014] The first, second, and third insulating rods are all hollow insulating rods. The outer diameter of the first insulating rod is smaller than the inner diameter of the second insulating rod, and the length of the first insulating rod is smaller than the length of the second insulating rod.

[0015] The second technical solution adopted in this invention is a method for detecting grounding voltage in subway contact networks, using the aforementioned integrated subway contact network grounding detection device. The specific steps are as follows:

[0016] S1. Connect the grounding end of the grounding wire to the rail;

[0017] S2. Rotate the third insulating rod so that the first insulating rod is in the extended state;

[0018] S3. Hang the double-tongue hook on the maintenance line to test for voltage. If the voltage detector alarms, notify the dispatcher to cut off the power. At the same time, open the voltage detector control interlock switch to prevent the first metal cylinder and the second metal cylinder from connecting and to prevent the grounding wire from being connected while the power is on.

[0019] S4. If the voltage detector does not alarm, keep the double tongue hooks on the maintenance line, adjust the first insulating rod to the retracted state, connect the grounding wire to the double tongue hooks, complete the grounding work, and then the maintenance work can be carried out.

[0020] S5. After the maintenance is completed, remove the double-tongue hook from the maintenance line, adjust the first metal cylinder and the second metal cylinder to the separated state, and connect the second metal cylinder and the metal connector through threaded connection.

[0021] The invention is further characterized by:

[0022] The specific process of S2 is as follows: by rotating the third insulating rod to drive the second insulating rod to rotate, the second internal thread on the first metal cylinder and the second external thread on the second metal cylinder are disengaged, and the two are adjusted to the separated state. Then, the third insulating rod is rotated to make the second metal cylinder and the metal connector connected by the first internal thread and the first external thread. At this time, the first insulating rod is in the extended state.

[0023] The specific method for adjusting the first insulating rod to the retracted state in S4 is as follows: Rotate the third insulating rod to adjust the second metal cylinder and metal connector to the disengaged state, retract the first insulating rod into the second insulating rod, and continue to rotate the third insulating rod to make the second internal thread on the first metal cylinder and the second external thread on the second metal cylinder engage and connect. At this time, the first insulating rod is in the retracted state. Connect the grounding wire to the double tongue hook to complete the grounding work, and then the maintenance work can be carried out.

[0024] The beneficial effects of this invention are:

[0025] (1) The integrated power detection and grounding device for subway contact network of the present invention solves the safety problem of the power detection line and the grounding line being inconsistent due to the negligence of the operators during the power outage maintenance of subway contact network;

[0026] (2) The integrated power detection and grounding device for subway contact network of the present invention achieves integrated power detection and grounding by setting up two different methods of connecting and separating the first metal cylinder and the second metal cylinder, thereby improving the safety level of operation and improving the efficiency of operation. Moreover, the integrated power detection and grounding device for subway contact network of the present invention has a simple structure, is easy to carry, and has strong versatility. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the integrated grounding and electrical detection device for subway overhead contact lines of the present invention.

[0028] Figure 2 This is a schematic diagram of the double-tongue hook structure in the integrated grounding and electrical testing device for subway contact networks of the present invention;

[0029] Figure 3 This is a schematic diagram of the internal structure of the first insulating rod in the integrated grounding and detection device for subway contact network of the present invention;

[0030] Figure 4This is an installation diagram showing the separation of the first metal cylinder and the second metal cylinder in the integrated grounding and electrical testing device for subway contact networks of the present invention.

[0031] Figure 5 This is an installation diagram showing the connection between the first metal cylinder and the second metal cylinder in the integrated grounding and electrical testing device for subway contact networks of the present invention.

[0032] In the diagram, 1. Double-tongue hook, 2. First metal cylinder, 3. First insulating rod, 4. Electroscope, 5. Current-limiting resistor, 6. Locking switch, 7. Metal connector, 8. Second metal cylinder, 9. Second insulating rod, 10. Grounding wire, 11. Third insulating rod. Detailed Implementation

[0033] The present invention will now be described in detail with reference to specific embodiments.

[0034] Integrated grounding and voltage detection device for subway overhead contact lines, such as Figure 1 , 2 As shown, the device includes a double-tongue hook 1. A first metal cylinder 2 is fixedly fitted onto one end of the double-tongue hook 1. A first insulating rod 3 passes through the end of the first metal cylinder 2 furthest from the double-tongue hook 1. The end of the first insulating rod 3 closest to the double-tongue hook 1 is fixedly located in the middle of the inner wall of the first metal cylinder 2. The diameter of the first insulating rod 3 is smaller than the inner diameter of the end of the first metal cylinder 2 furthest from the double-tongue hook 1, meaning the lower end of the first metal cylinder 2 does not contact the outer wall of the first insulating rod 3. Figure 3 As shown, the first insulating rod 3 is internally equipped with an electroscope 4, a current-limiting resistor 5, and a locking switch 6. Specifically, the electroscope 4 is located inside the first insulating rod 3 near the end of the double-tongue hook 1, the locking switch 6 is located inside the first insulating rod 3 away from the double-tongue hook 1, and the current-limiting resistor 5 is located between the electroscope 4 and the locking switch 6. The grounding terminal of the current-limiting resistor 5 is connected to the connecting assembly via a grounding lead. The input signal terminal of the electroscope 4 is connected to the double-tongue hook 1 via a wire, meaning the double-tongue hook 1 serves as the contact electrode of the electroscope 4. The electroscope 4 is connected to the current-limiting resistor 5 via a wire, allowing the electroscope 4 and the current-limiting resistor to divide the contact network voltage. The other end of the current-limiting resistor 5 is connected to the connecting assembly via a grounding lead. The output terminal of the electroscope 4 is also connected to the locking switch 6 via a signal line, and the locking switch 6 is controlled by the electroscope 4.

[0035] The end of the first insulating rod 3 away from the double tongue hook 1 is connected to the second insulating rod 9 via a connecting assembly. The end of the second insulating rod 9 away from the first insulating rod 3 is screwed to the third insulating rod 11, wherein the end of the third insulating rod 11 serves as a gripping end.

[0036] In this application, the first insulating rod 3, the second insulating rod 9, and the third insulating rod 11 are all hollow insulating rods. The outer diameter of the first insulating rod 3 is smaller than the inner diameter of the second insulating rod 9, and the length of the first insulating rod 3 is smaller than the length of the second insulating rod 9, ensuring that the first insulating rod 3 can be completely retracted into the second insulating rod 9.

[0037] like Figure 4 As shown, the connecting assembly includes a metal connector 7, which is connected to the end of the first insulating rod 3 away from the double tongue hook 1. The grounding terminal of the current limiting resistor 5 is connected to the end of the metal connector 7 near the locking switch 6 via a grounding lead. The outer side of the end of the metal connector 7 away from the first insulating rod 3 is provided with a first external thread. The outer diameter of the first external thread is larger than the outer diameter of the first insulating rod 3, and the outer diameter of the first external thread is smaller than the inner diameter of the second insulating rod 9.

[0038] It also includes a second metal cylinder 8, which is located at the end of the second insulating rod 9 near the first insulating rod 3. The inner side of the second metal cylinder 8 has a first internal thread that mates with the first external thread. The first internal thread on the second metal cylinder 8 is screwed onto the first external thread on the metal connector 7. The outer side of the second metal cylinder 8 also has a second external thread. The inner side of the end of the first metal cylinder 2 away from the double-tongue hook 1 has a second internal thread that mates with the second external thread. That is, the second metal cylinder 8 can be threadedly fixed to the metal connector 7, at which time the first insulating rod 3 is in an extended state. Simultaneously, the second metal cylinder 8 can also detach from the metal connector 7 and then be threadedly fixed to the first metal cylinder 2, such as... Figure 5 As shown, at this time, the first insulating rod 3 is located inside the second insulating rod 9 and is in a retracted state.

[0039] The connecting assembly is also connected to a grounding wire 10. Specifically, a metal screw is vertically installed on the outer wall of the second metal cylinder 8, and the grounding wire 10 is sleeved on the metal screw through a metal ring.

[0040] The method for testing the grounding of subway contact network using the aforementioned integrated subway contact network grounding and voltage testing device is as follows:

[0041] S1. Connect the grounding terminal of grounding wire 10 to the rail;

[0042] S2. Rotate the third insulating rod 11 so that the first insulating rod 3 is in the extended state;

[0043] The specific process is as follows: by rotating the third insulating rod 11, the second insulating rod 9 is rotated, the second internal thread on the first metal cylinder 2 and the second external thread on the second metal cylinder 8 are disengaged, the two are adjusted to the separated state, and the third insulating rod 11 is rotated to make the second metal cylinder 8 and the metal connector 7 connected by the first internal thread and the first external thread. At this time, the first insulating rod 3 is in the extended state.

[0044] S3. Hang the double-tongue hook 1 on the maintenance line to test for electricity. If the voltage detector 4 alarms, notify the dispatcher to cut off the power. At the same time, the voltage detector 4 controls the interlock switch 6 to open, preventing the first metal cylinder 2 and the second metal cylinder 8 from connecting and preventing the grounding wire from being connected while energized.

[0045] S4. If the voltage detector 4 does not alarm, keep the double tongue hook 1 on the maintenance line, rotate the third insulating rod 11 to adjust the second metal cylinder 8 and the metal connector 7 to the disengaged state, retract the first insulating rod 3 into the second insulating rod 9, continue to rotate the third insulating rod 11 to make the second internal thread on the first metal cylinder 2 and the second external thread on the second metal cylinder 8 engage and connect. At this time, the first insulating rod 3 is in the retracted state. Connect the grounding wire 10 to the double tongue hook 1 to complete the grounding work, and then the maintenance work can be carried out.

[0046] S5. After the maintenance is completed, remove the double-tongue hook 1 from the maintenance line, adjust the first metal cylinder 2 and the second metal cylinder 8 to the separated state, and connect the second metal cylinder 8 and the metal connector 7 through threaded connection. The purpose of this operation is to ensure that the device's grounding function is disabled and that it is in the voltage detection state so that it can be in the extended state when the device is used again.

[0047] The working principle of the integrated device for detecting voltage and grounding wires of subway overhead contact lines of the present invention is as follows:

[0048] First, connect the third insulating rod 11 to the second insulating rod 9. Connect one end of the grounding wire 10 to the screw of the second metal cylinder 8 and the other end to the rail.

[0049] Check whether the first insulating rod 3 is initially in an extended or retracted state. If the first insulating rod 3 is in a retracted state, it means that the first metal cylinder 2 and the second metal cylinder 8 are screwed together at this moment. The state at this time is as follows. Figure 5As shown, rotating the third insulating rod 11 separates the first metal cylinder 2 and the second metal cylinder 8, pulls the first insulating rod 3 out from the second insulating rod 9, and continues to rotate the third insulating rod 11 so that the second metal cylinder 8 and the metal connector 7 are connected by a threaded engagement. According to the maintenance work order, hook the double-tongue hook 1 in the designated position. At this time, the grounding terminal of the current-limiting resistor 5 is connected to the rail through the grounding lead, metal connector 7, second metal cylinder 8 and grounding wire 10. Observe whether the voltage detector 4 alarms. If it alarms, immediately notify the dispatcher. At this time, the work line is not de-energized and needs to be de-energized. The interlocking switch 6 is in the open position to prevent the grounding wire from being connected while energized. If the voltage detector 4 does not alarm and the interlocking switch 6 is in the closed position, rotate the third insulating rod 11 to disconnect the second metal cylinder 8 and metal connector 7. The first insulating rod 3 retracts into the second insulating rod 9, so that the grounding terminal of the current-limiting resistor 5 is disconnected from the grounding wire 10, thereby disabling the voltage detection function of the voltage detector 4. Continue to rotate the third insulating rod 11 to screw the first metal cylinder 2 and the second metal cylinder 8 together, thereby connecting the grounding wire 10 to the double-tongue hook 1, completing the voltage detection and grounding work, and the maintenance work can be carried out.

[0050] If the first insulating rod 3 is in an extended state, that is, the first metal cylinder 2 and the second metal cylinder 8 are in a separated state, and the second metal cylinder 8 and the metal connector 7 are in a connected state, then... Figure 4 As shown, according to the work order, hook 1 is attached to the designated position. At this time, the grounding terminal of the current limiting resistor 5 is connected to the rail through the grounding lead, metal connector 7, second metal cylinder 8, and grounding wire 10. Observe whether the detector 4 alarms. If it alarms, the interlocking switch 6 is opened, and the dispatcher is notified immediately. At this time, the working line is not de-energized, but it needs to be de-energized. If the detector 4 does not alarm, the interlocking switch 6 is in the closed state. Then rotate the third insulating rod 11 to disconnect the second metal cylinder 8 and metal connector 7. The first insulating rod 3 retracts into the second insulating rod 9, so that the grounding terminal of the current limiting resistor 5... The connection to the grounding wire 10 is disconnected, thus disabling the voltage detection function of the voltage detector 4. The first metal cylinder 2 and the second metal cylinder 8 are then connected by rotating the third insulating rod 11, thereby connecting the grounding wire 10 to the double-tongue hook 1. This completes the voltage detection and grounding work, preventing inconsistencies between the voltage detection line and the grounding wire line, which could lead to improper operation of connecting a live grounding wire and ensuring the safety of workers. This invention, a subway contact network voltage detection and grounding integrated device, can complete the connection and removal of the voltage detection and grounding wire 10 without changing the tools, thereby improving work efficiency.

[0051] Example 1

[0052] Integrated grounding and voltage detection device for subway overhead contact lines, such as Figure 1 , 2As shown, the device includes a double-tongue hook 1. A first metal cylinder 2 is fixedly fitted onto one end of the double-tongue hook 1. A first insulating rod 3 passes through the end of the first metal cylinder 2 furthest from the double-tongue hook 1. The end of the first insulating rod 3 closest to the double-tongue hook 1 is fixedly located in the middle of the inner wall of the first metal cylinder 2. The diameter of the first insulating rod 3 is smaller than the inner diameter of the end of the first metal cylinder 2 furthest from the double-tongue hook 1, meaning the lower end of the first metal cylinder 2 does not contact the outer wall of the first insulating rod 3. Figure 3 As shown, the first insulating rod 3 is internally equipped with an electroscope 4, a current-limiting resistor 5, and a locking switch 6. Specifically, the electroscope 4 is located inside the first insulating rod 3 near the end of the double-tongue hook 1, the locking switch 6 is located inside the first insulating rod 3 away from the double-tongue hook 1, and the current-limiting resistor 5 is located between the electroscope 4 and the locking switch 6. The grounding terminal of the current-limiting resistor 5 is connected to the connecting assembly via a grounding lead. The input signal terminal of the electroscope 4 is connected to the double-tongue hook 1 via a wire, meaning the double-tongue hook 1 serves as the contact electrode of the electroscope 4. The electroscope 4 is connected to the current-limiting resistor 5 via a wire, allowing the electroscope 4 and the current-limiting resistor to divide the contact network voltage. The other end of the current-limiting resistor 5 is connected to the connecting assembly via a grounding lead. The output terminal of the electroscope 4 is also connected to the locking switch 6 via a signal line, and the locking switch 6 is controlled by the electroscope 4.

[0053] The end of the first insulating rod 3 away from the double tongue hook 1 is connected to the second insulating rod 9 via a connecting assembly. The end of the second insulating rod 9 away from the first insulating rod 3 is screwed to the third insulating rod 11, wherein the end of the third insulating rod 11 serves as a gripping end.

[0054] like Figure 4 As shown, the connecting assembly includes a metal connector 7, which is connected to the end of the first insulating rod 3 away from the double tongue hook 1. The grounding terminal of the current limiting resistor 5 is connected to the end of the metal connector 7 near the locking switch 6 via a grounding lead. The outer side of the end of the metal connector 7 away from the first insulating rod 3 is provided with a first external thread. The outer diameter of the first external thread is larger than the outer diameter of the first insulating rod 3, and the outer diameter of the first external thread is smaller than the inner diameter of the second insulating rod 9.

[0055] It also includes a second metal cylinder 8, which is located at the end of the second insulating rod 9 near the first insulating rod 3. The inner side of the second metal cylinder 8 has a first internal thread that mates with the first external thread. The first internal thread on the second metal cylinder 8 is screwed onto the first external thread on the metal connector 7. The outer side of the second metal cylinder 8 also has a second external thread. The inner side of the end of the first metal cylinder 2 away from the double-tongue hook 1 has a second internal thread that mates with the second external thread. That is, the second metal cylinder 8 can be threadedly fixed to the metal connector 7, at which time the first insulating rod 3 is in an extended state. Simultaneously, the second metal cylinder 8 can also detach from the metal connector 7 and then be threadedly fixed to the first metal cylinder 2, such as... Figure 5As shown, at this time, the first insulating rod 3 is located inside the second insulating rod 9 and is in a retracted state.

[0056] The connecting assembly is also connected to a grounding wire 10. Specifically, a metal screw is vertically installed on the outer wall of the second metal cylinder 8, and the grounding wire 10 is sleeved on the metal screw through a metal ring.

[0057] Example 2

[0058] First, connect the third insulating rod 11 to the second insulating rod 9. Connect one end of the grounding wire 10 to the screw of the second metal cylinder 8 and the other end to the rail.

[0059] Check whether the first insulating rod 3 is initially in the extended or retracted state. If the first insulating rod 3 is in the retracted state, it means that the first metal cylinder 2 and the second metal cylinder 8 are screwed together. Rotate the third insulating rod 11 to separate the first metal cylinder 2 and the second metal cylinder 8, pull the first insulating rod 3 out from the second insulating rod 9, and continue to rotate the third insulating rod 11 so that the second metal cylinder 8 and the metal connector 7 are connected by a threaded engagement. According to the maintenance work order, hook the double-tongue hook 1 in the designated position. At this time, the grounding terminal of the current-limiting resistor 5 is connected to the rail through the grounding lead, metal connector 7, second metal cylinder 8 and grounding wire 10. Observe whether the voltage detector 4 alarms. If it alarms, immediately notify the dispatcher. At this time, the work line is not de-energized and needs to be de-energized. The interlocking switch 6 is in the open position to prevent the grounding wire from being connected while energized. If the voltage detector 4 does not alarm and the interlocking switch 6 is in the closed position, rotate the third insulating rod 11 to disconnect the second metal cylinder 8 and metal connector 7. The first insulating rod 3 retracts into the second insulating rod 9, so that the grounding terminal of the current-limiting resistor 5 is disconnected from the grounding wire 10, thereby disabling the voltage detection function of the voltage detector 4. Continue to rotate the third insulating rod 11 to screw the first metal cylinder 2 and the second metal cylinder 8 together, thereby connecting the grounding wire 10 to the double-tongue hook 1, completing the voltage detection and grounding work, and the maintenance work can be carried out.

[0060] Example 3

[0061] First, connect the third insulating rod 11 to the second insulating rod 9. Connect one end of the grounding wire 10 to the screw of the second metal cylinder 8 and the other end to the rail.

[0062] Check whether the first insulating rod 3 is initially extended or retracted. If the first insulating rod 3 is extended, that is, the first metal cylinder 2 and the second metal cylinder 8 are separated, and the second metal cylinder 8 and the metal connector 7 are connected, hook the double-tongue hook 1 in the specified position according to the work order. At this time, the grounding terminal of the current limiting resistor 5 is connected to the rail through the grounding lead, metal connector 7, second metal cylinder 8 and grounding wire 10. Observe whether the detector 4 alarms. If it alarms, the interlocking switch 6 is opened, and the dispatcher is notified immediately. At this time, the working line is not de-energized, but needs to be de-energized. If the detector 4 does not alarm, the interlocking switch 6 is closed. Then rotate the third insulating rod 11 to connect the second metal cylinder 8. The first insulating rod 3 retracts inside the second insulating rod 9 after the metal connector 7 is disconnected, thus disconnecting the grounding terminal of the current-limiting resistor 5 from the grounding wire 10, thereby disabling the voltage detection function of the voltage detector 4. Then, by rotating the third insulating rod 11 again, the first metal cylinder 2 and the second metal cylinder 8 are connected, thereby connecting the grounding wire 10 to the double-tongue hook 1, thus completing the voltage detection and grounding work. This avoids inconsistencies between the voltage detection line and the grounding wire line, preventing violations such as improper grounding operations while the wire is live, and ensuring the safety of the workers. This invention, an integrated voltage detection and grounding device for subway contact networks, can complete the connection and removal of the voltage detection and grounding wire 10 without changing the work tools, thereby improving work efficiency.

Claims

1. Metro contact network electrical testing and grounding integrated device, It is characterized in that The invention comprises a double-tongue hook (1), wherein a first metal cylinder (2) is fixedly sleeved on one end of the double-tongue hook (1), a first insulating rod (3) is penetrated through the end of the first metal cylinder (2) away from the double-tongue hook (1), an end of the first insulating rod (3) close to the double-tongue hook (1) is fixedly arranged at the middle part of the inner wall of the first metal cylinder (2), a diameter of the first insulating rod (3) is smaller than the inner diameter of the end of the first metal cylinder (2) away from the double-tongue hook (1), an electroscope (4), a current limiting resistor (5) and a locking switch (6) are respectively arranged inside the first insulating rod (3), an end of the first insulating rod (3) away from the double-tongue hook (1) is connected to a second insulating rod (9) through a connecting assembly, and an end of the second insulating rod (9) away from the first insulating rod (3) is screwed to a third insulating rod (11); The connection assembly is also connected to a grounding wire (10).

2. According to the integrated device for testing and grounding the contact network of subway according to claim 1, It is characterized in that The electroscope (4) is arranged inside the end of the first insulating rod (3) close to the double-tongue hook (1), the locking switch (6) is arranged inside the end of the first insulating rod (3) away from the double-tongue hook (1), the current-limiting resistor (5) is located between the electroscope (4) and the locking switch (6), and the grounding end of the current-limiting resistor (5) is connected to the connection assembly via a grounding down conductor; The input signal end of the electroscope (4) is connected to the double-tongue hook (1) via a wire, that is, the double-tongue hook (1) serves as a contact electrode of the electroscope (4); the ground of the electroscope (4) is connected to a current-limiting resistor (5) via a wire; the other end of the current-limiting resistor (5) is connected to a connection assembly via a grounding down conductor; and the output end of the electroscope (4) is also connected to a locking switch (6) via a signal line.

3. According to the integrated device for testing and grounding the subway overhead contact network as described in claim 1, It is characterized in that The connection assembly comprises a metal connection piece (7), the metal connection piece (7) being connected to an end of the first insulating rod (3) away from the double-tongue hook (1), a first external thread being provided on the outer side of the end of the metal connection piece (7) away from the first insulating rod (3), the outer diameter of the first external thread being greater than the outer diameter of the first insulating rod (3), and the outer diameter of the first external thread being less than the inner diameter of the second insulating rod (9); It also includes a second metal cylinder (8), which is arranged at one end of the second insulating rod (9) close to the first insulating rod (3), the inner side of the second metal cylinder (8) is provided with a first internal thread matching the first external thread, the first internal thread on the second metal cylinder (8) is threadedly connected to the first external thread on the metal connecting piece (7), the outer side of the second metal cylinder (8) is also provided with a second external thread, and the inner side of one end of the first metal cylinder (2) away from the double-tongue hook (1) is provided with a second internal thread matching the second external thread; A metal screw is also vertically mounted on the outer wall of the second metal cylinder (8), and the grounding wire (10) is sleeved on the metal screw via a metal ring; The grounding end of the current-limiting resistor (5) is connected to one end of the metal connector (7) close to the locking switch (6) via a grounding down conductor.

4. According to the integrated device for testing and grounding the contact network of subway according to claim 1, It is characterized in that The first insulating rod (3), the second insulating rod (9) and the third insulating rod (11) are all hollow insulating rods, the outer diameter of the first insulating rod (3) is smaller than the inner diameter of the second insulating rod (9), and the length of the first insulating rod (3) is smaller than the length of the second insulating rod (9). 5.Metro contact network electrical inspection and grounding detection method, It is characterized in that The integrated device for testing and grounding the contact network of a subway as claimed in any one of claims 1 to 4 is used, characterized in that the specific steps are as follows: S1, connecting the grounding end of the grounding wire (10) to the rail; S2, rotating the third insulating rod (11) so that the first insulating rod (3) is in an extended state; S3, the double-tongue hook (1) is hung on the maintenance line to test the electricity. If the tester (4) alarms, the dispatcher is notified to cut off the power. At the same time, the tester (4) controls the locking switch (6) to open, preventing the first metal cylinder (2) and the second metal cylinder (8) from connecting, so as to prevent the grounding wire from being hung with electricity; S4. If the tester (4) does not give an alarm, keep the double-tongue hook (1) hanging on the maintenance line, adjust the first insulating rod (3) to be in a retracted state, connect the grounding wire (10) with the double-tongue hook (1), complete the grounding work, and then start the maintenance work; S5. After the inspection is completed, the double-tongue hook (1) is removed from the inspection line, the first metal cylinder (2) and the second metal cylinder (8) are adjusted to a separated state, and the second metal cylinder (8) and the metal connector (7) are connected by threaded fitting.

6. According to the method for detecting the electrical and grounding of the subway overhead contact network according to claim 5, It is characterized in that The specific process of S2 is as follows: by rotating the third insulating rod (11) to drive the second insulating rod (9) to rotate, the second internal thread on the first metal cylinder (2) and the second external thread on the second metal cylinder (8) are disengaged, the two are adjusted to a separated state, and the third insulating rod (11) is continued to be rotated so that the second metal cylinder (8) and the metal connecting piece (7) are connected through the first internal thread and the first external thread. At this time, the first insulating rod (3) is in an extended state.

7. According to the method for detecting the electrical and grounding of the subway overhead contact network according to claim 5, It is characterized in that The specific method for adjusting the first insulating rod (3) to the retracted state in S4 is: rotating the third insulating rod (11) to adjust the second metal cylinder (8) and the metal connecting piece (7) to a disengaged state, retracting the first insulating rod (3) into the second insulating rod (9), and continuing to rotate the third insulating rod (11) to make the second internal thread on the first metal cylinder (2) and the second external thread on the second metal cylinder (8) cooperate and connect. At this time, the first insulating rod (3) is in the retracted state, the grounding wire (10) is connected to the double-tongue hook (1), the grounding work is completed, and the maintenance work can be carried out.

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