Switching control device for rotating mechanism and luffing mechanism of portal crane and portal crane

Abstract

The utility model discloses a portal crane rotating mechanism and luffing mechanism switching control device and a portal crane, and relates to the field of portal crane control, a rotating mechanism comprises a rotating motor, a luffing mechanism comprises a luffing motor, and the switching control device comprises a luffing mechanism control circuit, a third contactor and a rotating mechanism control circuit; the luffing mechanism control circuit comprises a luffing frequency converter, a first contactor and a second contactor which are electrically connected in sequence; the rotating mechanism control circuit comprises a rotating frequency converter, a fourth contactor and a fifth contactor which are electrically connected in sequence, one end of the third contactor is connected between the first contactor and the second contactor, and the other end of the third contactor is connected between the fourth contactor and the fifth contactor; when the variable-amplitude frequency converter and the rotary frequency converter do not break down, the rotary mechanism and the variable-amplitude mechanism act simultaneously or independently, and when one of the two frequency converters breaks down, the frequency converter which does not break down can be used for replacing the broken-down frequency converter, so that the situation that the portal crane is in an unsafe state is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of door machine control, and in particular relates to a switching control device for a door machine rotation mechanism and a variable amplitude mechanism, and a door machine. Background Art

[0002] The rotating mechanism of a gantry crane (gantry crane for short) is driven by a single inverter to drive a single motor, and the luffing mechanism is driven by a single inverter to drive a single motor, so as to realize the separate or joint action of the rotating mechanism and the luffing mechanism. When a failure occurs in one of the rotating mechanism or the luffing mechanism, the corresponding mechanism cannot be operated and the gantry crane cannot be parked in a safe position, which seriously affects the safety of the gantry crane and equipment on ships and shores.

[0003] In the prior art, in order to avoid the above situation, it is usually chosen to configure a backup inverter for the rotating mechanism and a backup inverter for the luffing mechanism. The backup inverters of the rotating mechanism and the luffing mechanism are the same in some prior art, and two in some other prior art. However, for the prior art, adding additional backup inverters will increase the cost. In addition, for some gantry machine electrical rooms, due to limited installation space, it is impossible to install additional backup inverters. Utility Model Content

[0004] The utility model provides a switching control device for a door machine rotation mechanism and a luffing mechanism and a door machine. When a frequency converter of the rotation mechanism or the luffing mechanism fails, the two mechanisms can be switched for use, thereby ensuring the safety of the door machine.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] In a first aspect, a switching control device for a door machine rotating mechanism and a variable amplitude mechanism is provided, wherein the rotating mechanism includes a rotating motor, the variable amplitude mechanism includes a variable amplitude motor, and the switching control device includes: a variable amplitude mechanism control circuit, a third contactor and a rotating mechanism control circuit; the variable amplitude mechanism control circuit includes a variable amplitude frequency converter, a first contactor and a second contactor electrically connected in sequence; when the first contactor and the second contactor are both closed, the variable amplitude frequency converter and the variable amplitude motor form a first variable amplitude current path; the rotating mechanism control circuit includes a rotating frequency converter, a fourth contactor and a fifth contactor electrically connected in sequence, when the fourth contactor and the fifth contactor are both closed, the rotating frequency converter and the rotating motor form a first rotating current path; one end of the third contactor is connected between the first contactor and the second contactor, and the other end is connected between the fourth contactor and the fifth contactor; when the third contactor is in a closed state, the variable amplitude frequency converter and the rotating motor can form a second rotating current path, or the rotating frequency converter and the variable amplitude motor can form a second variable amplitude current path.

[0007] Optionally, it also includes a first gear switch and a second gear switch, the first gear switch including a variable amplitude normal operation gear and a variable amplitude switching rotation gear; the second gear switch including a rotation normal operation gear and a rotation switching variable amplitude gear; when the first gear switch is in a working state, it is only in one of the gears to form a first variable amplitude current path or a second rotation current path; when the second gear switch is in a working state, it is only in one of the gears to form a first rotation current path or a second variable amplitude current path.

[0008] Optionally, both the first gear switch and the second gear switch further include a stop gear.

[0009] Optionally, both the amplitude converter and the rotary converter are provided with amplitude motor parameters and rotary motor parameters; and further include a control unit, the control unit being used to select motor parameters used by the amplitude converter and the rotary converter.

[0010] Optionally, the amplitude-variable frequency converter is also connected to a first intermediate relay, and the rotary frequency converter is also connected to a second intermediate relay. When the first intermediate relay, the first contactor, the third contactor and the fifth contactor are all in a closed state, the amplitude-variable frequency converter and the rotary motor can form a second rotating current path; when the second intermediate relay, the second contactor, the third contactor and the fourth contactor are all in a closed state, the rotary frequency converter and the amplitude-variable motor can form a second amplitude-variable current path.

[0011] Optionally, the amplitude variation mechanism control circuit and the rotation mechanism control circuit are both connected to a three-phase power supply; the three-phase power supply is connected to the amplitude variation frequency converter and the rotation frequency converter through two air switches, respectively.

[0012] Optionally, a fuse and an inductor are further connected between the air switch and the input end of the amplitude converter or the input end of the rotary converter.

[0013] In a second aspect, a door machine is provided, comprising a rotating mechanism and a variable amplitude mechanism, and further comprising a switching control device as described in any one of the first aspects, wherein the switching control device is capable of switching the frequency converters used by the variable amplitude mechanism and the rotating mechanism.

[0014] The beneficial effects of the utility model are:

[0015] The rotating mechanism and the luffing mechanism can operate simultaneously or independently when the luffing inverter and the rotating inverter are not faulty. When one of the luffing inverter and the rotating inverter fails, the healthy inverter can be used to replace the faulty inverter, thereby preventing the door machine from being in an unsafe state. The overall structure is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the overall circuit control schematic diagram of the utility model;

[0017] Figure 2 It is a schematic diagram of the circuit principle when the first gear switch and the second gear switch of the utility model are in different working gears. DETAILED DESCRIPTION

[0018] The utility model is described in detail below with reference to the accompanying drawings.

[0019] It should be noted that the terms such as "upper", "lower", "left", "right", "front", "back", etc. used in the utility model are only for the convenience of description and are not used to limit the scope of implementation of the utility model. Changes or adjustments in their relative relationships should be regarded as the scope of implementation of the utility model without substantially changing the technical content.

[0020] Embodiment 1

[0021] like Figure 1 and 2 As shown, a switching control device for a door machine rotating mechanism and a luffing mechanism is provided, wherein the rotating mechanism includes a rotating motor M2, the luffing mechanism includes a luffing motor M1, and the switching control device includes: a luffing mechanism control circuit, a third contactor KM3 and a rotating mechanism control circuit.

[0022] The amplitude variation mechanism control circuit includes an amplitude variation frequency converter 1-1, a first contactor KM1 and a second contactor KM2 which are electrically connected in sequence; when the first contactor KM1 and the second contactor KM2 are both closed, the amplitude variation frequency converter 1-1 and the amplitude variation motor M1 form a first amplitude variation current path; specifically, the amplitude variation frequency converter 1-1, the first contactor KM1, the second contactor KM2 and the amplitude variation motor M1 are connected in series.

[0023] The rotating mechanism control circuit includes a rotating frequency converter 1-2, a fourth contactor KM4 and a fifth contactor KM5 which are electrically connected in sequence. When the fourth contactor KM4 and the fifth contactor KM5 are both closed, the rotating frequency converter 1-2 forms a first rotating current path with the rotating motor M2; specifically, the rotating frequency converter 1-2, the fourth contactor KM4, the fifth contactor KM5 and the rotating motor M2 are connected in series.

[0024] One end of the third contactor KM3 is connected between the first contactor KM1 and the second contactor KM2, and the other end is connected between the fourth contactor KM4 and the fifth contactor KM5; when the third contactor KM3 is in a closed state, the variable amplitude frequency converter 1-1 and the rotating motor M2 can form a second rotating current path, or the rotating frequency converter 1-2 and the variable amplitude motor M1 can form a second variable amplitude current path, that is, only one of the second rotating current path and the second variable amplitude current path can be formed; when the second variable amplitude current path is formed, the fourth contactor KM4, the third contactor KM3 and the second contactor KM5 are connected. The contactors KM2 are all closed, thereby forming a path with the rotating frequency converter 1-2. When the second variable amplitude current path is formed, the first contactor KM1 and the fifth contactor KM5 are in the disconnected state; when the second rotating current path is formed, the first contactor KM1, the third contactor KM3 and the fifth contactor KM5 are in the closed state, and the second contactor KM2 and the fourth contactor KM4 are in the disconnected state; the first rotating current path and the first variable amplitude current path can be formed at the same time, that is, the rotating mechanism and the variable amplitude mechanism can operate at the same time when there is no failure in the variable amplitude frequency converter 1-1 and the rotating frequency converter 1-2.

[0025] By switching the first contactor KM1, the second contactor KM2, the third contactor KM3, the fourth contactor KM4 and the fifth contactor KM5, the frequency converter used by the variable amplitude motor M1 and the rotating motor M2 can be realized, so that when one of the rotating frequency converter 1-2 or the variable amplitude frequency converter 1-1 is damaged, the other one can be used for emergency operation, thereby preventing the door machine from being in an unsafe state.

[0026] The models of the amplitude converter 1-1 and the rotary converter 1-2 are both CIMR-HB4A0605AB.

[0027] Specifically, the switching control device also includes a first gear switch SB1 and a second gear switch SB2, the first gear switch SB1 includes a variable amplitude normal operation gear and a variable amplitude switching rotation gear; the second gear switch SB2 includes a rotation normal operation gear and a rotation switching variable amplitude gear; when the first gear switch SB1 is in a working state, it is only in one of the gears to form a first variable amplitude current path or a second rotation current path; when the second gear switch SB2 is in a working state, it is only in one of the gears to form a first rotation current path or a second variable amplitude current path, that is, for the rotating motor M2 and the variable amplitude motor M1, only one current path can be formed during operation, when the first gear switch SB1 is in the variable amplitude normal operation gear, a first variable amplitude current path is formed, when the first gear switch SB1 is in the variable amplitude switching rotation gear, a second rotation current path is formed, when the second gear switch SB2 is in the rotation normal operation gear, a first rotation current path is formed, and when the second gear switch SB2 is in the rotation switching variable amplitude gear, a second variable amplitude current path is formed.

[0028] Specifically, the first gear switch SB1 and the second gear switch SB2 both include a stop gear, that is, when the rotating mechanism and the amplitude changing mechanism are not working, the first gear switch SB1 and the second gear switch SB2 are both in the stop gear, when the first gear switch SB1 is in the stop gear, the first contactor KM1 and the second contactor KM2 are disconnected, and when the second gear switch SB2 is in the stop gear, the fourth contactor KM4 and the fifth contactor KM5 are disconnected.

[0029] Specifically, the amplitude variable frequency converter 1-1 and the rotary frequency converter 1-2 are both provided with the amplitude variable motor M1 parameters and the rotary motor M2 parameters, and the switching control device also includes a control unit, which is used to select the motor parameters used by the amplitude variable frequency converter 1-1 and the rotary frequency converter 1-2, that is, the rotary frequency converter 1-2 uses the rotary motor M2 parameters when forming the first rotary current path, and the rotary frequency converter 1-2 uses the amplitude variable motor M1 parameters when forming the second amplitude variable current path; the amplitude variable frequency converter 1-1 uses the amplitude variable motor M1 parameters in forming the first amplitude variable current path, and uses the rotary motor M2 parameters in forming the second rotary current path.

[0030] In some other embodiments, the amplitude-variable frequency converter 1-1 is also connected to a first intermediate relay KA1, and the rotary frequency converter 1-2 is also connected to a second intermediate relay KA2. When the first intermediate relay KA1, the first contactor KM1, the third contactor KM3 and the fifth contactor KM5 are all in a closed state, the amplitude-variable frequency converter 1-1 and the rotary motor M2 can form a second rotating current path; when the second intermediate relay KA2, the second contactor KM2, the third contactor KM3 and the fourth contactor KM4 are all in a closed state, the rotary frequency converter 1-2 and the amplitude-variable motor M1 can form a second amplitude-variable current path.

[0031] Specifically, the amplitude variation mechanism control circuit and the rotating mechanism control circuit are both connected to a three-phase power supply; the three-phase power supply is respectively connected to the amplitude variation frequency converter 1-1 and the rotating frequency converter 1-2 through two air switches; the three-phase power supply of the amplitude variation mechanism control circuit and the rotating mechanism control circuit can be the same, and of course can also be set to two different ones as needed.

[0032] Furthermore, a fuse and an inductor are connected between the air switch and the input end of the amplitude converter 1 - 1 , and a fuse and an inductor are also connected between the air switch and the input end of the rotary converter 1 - 2 .

[0033] Embodiment 2

[0034] A door machine comprises a rotating mechanism and a luffing mechanism, and also comprises the switching control device, wherein the switching control device can switch the frequency converters used by the luffing mechanism and the rotating mechanism.

[0035] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0036] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should be regarded as the protection scope of the utility model.

Claims

1. A switching control device for a door crane rotating mechanism and a luffing mechanism, wherein the rotating mechanism comprises a rotating motor, and the luffing mechanism comprises a luffing motor, characterized in that: include: A variable amplitude mechanism control circuit, a third contactor and a rotating mechanism control circuit; the variable amplitude mechanism control circuit comprises a variable amplitude frequency converter, a first contactor and a second contactor which are electrically connected in sequence; when the first contactor and the second contactor are both closed, the variable amplitude frequency converter and the variable amplitude motor form a first variable amplitude current path; the rotating mechanism control circuit comprises a rotating frequency converter, a fourth contactor and a fifth contactor which are electrically connected in sequence; when the fourth contactor and the fifth contactor are both closed, the rotating frequency converter and the rotating motor form a first rotating current path; One end of the third contactor is connected between the first contactor and the second contactor, and the other end is connected between the fourth contactor and the fifth contactor; when the third contactor is in a closed state, the variable amplitude frequency converter and the rotating motor can form a second rotating current path, or the rotating frequency converter and the variable amplitude motor can form a second variable amplitude current path.

2. The door crane rotation mechanism and luffing mechanism switching control device according to claim 1 is characterized in that: It also includes a first gear switch and a second gear switch, the first gear switch includes a variable amplitude normal operation gear and a variable amplitude switching rotation gear; the second gear switch includes a rotation normal operation gear and a rotation switching variable amplitude gear; when the first gear switch is in a working state, it is only in one of the gears to form a first variable amplitude current path or a second rotation current path; when the second gear switch is in a working state, it is only in one of the gears to form a first rotation current path or a second variable amplitude current path.

3. The door crane rotation mechanism and luffing mechanism switching control device according to claim 2 is characterized in that: The first gear switch and the second gear switch both include a stop gear.

4. The switching control device for the door crane rotation mechanism and the luffing mechanism according to claim 1 is characterized in that: The variable amplitude frequency converter and the rotary frequency converter are both provided with the variable amplitude motor parameters and the rotary motor parameters; and also include a control unit, the control unit is used to select the motor parameters used by the variable amplitude frequency converter and the rotary frequency converter.

5. The switching control device for the door crane rotation mechanism and the luffing mechanism according to claim 1 is characterized in that: The variable amplitude frequency converter is also connected to a first intermediate relay, and the rotary frequency converter is also connected to a second intermediate relay. When the first intermediate relay, the first contactor, the third contactor and the fifth contactor are all in a closed state, the variable amplitude frequency converter and the rotary motor can form a second rotating current path; when the second intermediate relay, the second contactor, the third contactor and the fourth contactor are all in a closed state, the rotary frequency converter and the variable amplitude motor can form a second variable amplitude current path.

6. The switching control device for the door crane rotation mechanism and the luffing mechanism according to claim 1 is characterized in that: The amplitude variation mechanism control circuit and the rotation mechanism control circuit are both connected to a three-phase power supply; the three-phase power supply is connected to the amplitude variation frequency converter and the rotation frequency converter through two air switches respectively.

7. The switching control device for the door crane rotation mechanism and the luffing mechanism according to claim 6 is characterized in that: A fuse and an inductor are also connected between the air switch and the input end of the amplitude converter or the input end of the rotary converter.

8. A door crane, comprising a rotating mechanism and a luffing mechanism, characterized in that: It also includes a switching control device as described in any one of claims 1 to 7, wherein the switching control device is capable of switching the frequency converters used by the amplitude changing mechanism and the rotating mechanism.

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