Safety protection device for maintenance of triboelectric track of travelling crane

Abstract

The utility model discloses a crane triboelectric track maintenance safety protection device, and relates to the technical field of crane track safety equipment. The device comprises a current transformer and an AC digital display ammeter. The primary side of the current transformer is connected in series between the power circuit breaker and the triboelectric channel, and the secondary side of the current transformer is connected in series to the current signal input end of the alternating current digital display ampere meter; the power supply end of the AC digital display ammeter is connected with a power supply through an air switch, and the normally open contact of the AC digital display ammeter is connected in parallel with the opening button of the power supply circuit breaker. Compared with the prior art, the utility model can solve the problem of electric shock accidents possibly caused by accidental power transmission on site when the protective equipment fails or is disassembled in the maintenance process.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle track safety equipment, in particular to a vehicle track maintenance safety protection device. Background Art

[0002] During the daily inspection and maintenance of the driving grinding track, when the maintenance personnel stop the vehicle for power outage, they must install track stops on the track and draw cordons in the relevant areas above the track and on the ground. Before the operation, the power must be shut down for inspection, the power circuit breaker must be locked and tagged, and a temporary grounding wire must be installed on the three-phase power supply of the grinding track. Work can only begin after confirmation. The currently commonly used temporary grounding wire is a portable national standard low-voltage personal safety low-voltage grounding wire, which can be used for secondary protection of low-voltage lines when power outages are required for maintenance. It can prevent accidental power supply and accidental feedback electricity from the secondary system during the maintenance process, and eliminate other aspects of induced electricity. However, in the actual maintenance process, there may be situations such as grounding wire failure, too small grounding wire capacity, missing grounding wire, and continued operation after the grounding wire is removed. If there is an accidental power supply error on site under the above circumstances, it may cause an electric shock accident, threatening the personal safety of maintenance personnel. Utility Model Content

[0003] The utility model aims to provide a maintenance safety protection device for a driving grinding track, which can solve the problem that when the protective equipment fails or is removed during the maintenance process, an unexpected error in power transmission on site may cause an electric shock accident.

[0004] In order to solve the above problems, the technical solution adopted by the utility model is: this driving grinding track maintenance safety protection device includes a current transformer and an AC digital ammeter; the primary side of the current transformer is connected in series between the power circuit breaker and the grinding track, and its secondary side is connected in series to the current signal input end of the AC digital ammeter; the power supply end of the AC digital ammeter is connected to the power supply through an air switch, and its normally open contact is connected in parallel with the disconnect button of the power circuit breaker.

[0005] In the above technical solution, a more specific technical solution may also be: a relay for controlling the normally open contact is provided in the AC digital display ammeter.

[0006] Furthermore, a fuse is provided between the air switch and the power supply.

[0007] Furthermore, the voltage of the power supply is AC 220V.

[0008] Furthermore, the incoming power voltage of the power circuit breaker is AC 220V.

[0009] Furthermore, the current ratio of the current transformer is 1000 / 5A.

[0010] Furthermore, the power circuit breaker is also provided with a closing button.

[0011] Due to the adoption of the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0012] The utility model has the functions of current detection and current over-limit unable to close function; in the daily inspection and maintenance of the grinding circuit, the AC digital display ammeter detects the current of the grinding circuit in the inspection process in real time through the current transformer. If there is an unexpected error in power transmission, the line generates a large current exceeding the upper limit set by the AC digital display ammeter, which immediately triggers the internal relay of the AC digital display ammeter to operate and the normally open contacts to close, so that even if the protective equipment fails or is removed during the inspection, the power circuit breaker cannot be closed, which further ensures the personal safety of the maintenance personnel and prevents electric shock accidents caused by accidental power transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 It is a schematic diagram of the connection structure between the normally open contacts of an AC digital ammeter and a power circuit breaker. DETAILED DESCRIPTION

[0015] The utility model is further described in detail below in conjunction with the accompanying drawings:

[0016] like Figure 1 and Figure 2 The maintenance safety protection device for a driving grinding track shown in the figure comprises a current transformer 101 and an AC digital ammeter 102; the primary side of the current transformer 101 is connected in series between the power circuit breaker QF0 and the grinding track, and the secondary side thereof is connected in series to the current signal input terminal of the AC digital ammeter 102; the power terminal of the AC digital ammeter 102 is connected to the power supply through an air switch QF1, the power circuit breaker QF0 is provided with a closing button SB1 and an opening button SB2, the normally open contact of the AC digital ammeter 102 is connected in parallel with the opening button SB2 of the power circuit breaker QF0, and a relay for controlling the normally open contact is provided inside the AC digital ammeter 102.

[0017] A fuse 103 is provided between the air switch QF1 and the power supply.

[0018] In this embodiment, the voltage of the power supply and the incoming power voltage of the power circuit breaker QF0 are both AC 220V, and the current ratio of the current transformer 101 is 1000 / 5A; the model of the AC digital ammeter is F509, and its terminals 1 and 2 are power terminals, terminals 3 and 4 are current signal input terminals, and terminals 5 and 6 are normally open contacts.

[0019] Working principle of the utility model: The utility model can flexibly switch between the maintenance mode and the normal vehicle use mode through the air switch QF1; when the grinding track needs to be repaired and maintained, the maintenance personnel will open the power circuit breaker QF0 and close the air switch QF1 to supply power to the AC digital display ammeter 102. The AC digital display ammeter 102 works normally and detects the grinding track current during the maintenance process through the current transformer 101. If there is a wrong power supply during the maintenance process, a large current will be generated at the moment the power circuit breaker QF0 is closed. When the current exceeds the upper limit set by the AC digital display ammeter 102, the internal relay of the AC digital display ammeter 102 is energized, and the normally open contact is closed, so that the power circuit breaker QF0 cannot be closed, effectively avoiding the problem that the accidental power supply error on site may cause electric shock accidents. When using the vehicle normally, open the air switch QF1 and close the power circuit breaker QF0.

[0020] The AC digital ammeter 102 can flexibly set the upper limit of the relay action according to the actual situation on site to prevent the upper limit from being set too small, causing the power circuit breaker QF0 to be erroneously tripped, or the upper limit from being set too large, failing to achieve the purpose of rapid tripping of the power circuit breaker QF0.

[0021] The model of the AC digital ammeter and the specifications of the current transformer can also be selected according to the needs of the actual application.

Claims

1. A safety protection device for maintenance of electric track, characterized in that: It includes a current transformer and an AC digital ammeter; the primary side of the current transformer is connected in series between the power circuit breaker and the grinding circuit, and the secondary side is connected in series to the current signal input end of the AC digital ammeter; the power end of the AC digital ammeter is connected to the power supply through an air switch, and its normally open contact is connected in parallel with the disconnect button of the power circuit breaker.

2. The vehicle grinding track maintenance safety protection device according to claim 1 is characterized by: The AC digital display ammeter is provided with a relay for controlling the normally open contact.

3. The vehicle grinding track maintenance safety protection device according to claim 1 or 2, characterized in that: A fuse is provided between the air switch and the power supply.

4. The vehicle grinding track maintenance safety protection device according to claim 3 is characterized by: The voltage of the power supply is AC 220V.

5. The vehicle grinding track maintenance safety protection device according to claim 4 is characterized in that: The incoming power voltage of the power circuit breaker is AC 220V.

6. The vehicle grinding track maintenance safety protection device according to claim 5 is characterized by: The current ratio of the current transformer is 1000 / 5A.

7. The vehicle grinding track maintenance safety protection device according to claim 6 is characterized by: The power circuit breaker is also provided with a closing button.

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