Crown block contactor adhesion alarm device

Abstract

The utility model relates to the technical field of contactors, and provides a crown block contactor adhesion alarm device. The circuit comprises a starting circuit and a detection circuit, the starting circuit comprises a first normally-open button and a first contactor, and the first normally-open button is connected with a coil of the first contactor in series; the detection circuit comprises a second normally-open button, a first normally-closed button and an alarm, the second normally-open button, the first normally-closed button and the alarm are sequentially connected in series, the second normally-open button is connected with a normally-open contact of the first contactor in parallel, and the first normally-closed button is connected with a normally-closed contact of the first contactor in parallel; the first normally-open button, the second normally-open button and the first normally-closed button are arranged in the same composite button, a normally-open main contact of the first contactor is connected in series in a crown block driving circuit, the crown block contactor adhesion alarm device can give an alarm for two adhesion phenomena of the contactor, and the safety in the using process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of contactors, in particular to an adhesion alarm device for a crane contactor. Background Art

[0002] A crane is a large hoisting device used in a factory. In the circuit inside the crane, a contactor is often used to achieve the control process of weak electricity controlling strong electricity. A common and serious fault of the contactor is contactor adhesion, that is, the contacts of the contactor are fixed at a specific position and are no longer controlled. It may not be able to brake when powered on, or may not be able to brake when powered off.

[0003] In the prior art, the alarm of the adhesion detector only alarms for the situation where it cannot brake when powered off. However, the use of crane equipment mostly cooperates with other machinery. Both types of adhesion problems will cause the cooperation relationship to be damaged, resulting in accidents. Content of the Utility Model

[0004] The purpose of the utility model is to provide an adhesion alarm device for a crane contactor, which can alarm for the two adhesion phenomena of the contactor and improve the safety during use.

[0005] The utility model provides an adhesion alarm device for a crane contactor, including:

[0006] A start circuit, the start circuit includes a first normally open button and a first contactor, and the first normally open button and the coil of the first contactor are connected in series;

[0007] A detection circuit, the detection circuit includes a second normally open button, a first normally closed button and an alarm, the second normally open button, the first normally closed button and the alarm are connected in series in sequence, the second normally open button is connected in parallel with the normally open contact of the first contactor, and the first normally closed button is connected in parallel with the normally closed contact of the first contactor;

[0008] The first normally open button, the second normally open button and the first normally closed button are arranged in the same composite button, and the normally open main contact of the first contactor is connected in series in the crane drive circuit.

[0009] Preferably, the alarm includes a first warning light and a second warning light. The first warning light and the normally closed contact of the first contactor are connected in series and then connected in parallel with the first normally closed button. The second warning light and the normally open contact of the first contactor are connected in series and then connected in parallel with the second normally open button.

[0010] Preferably, the overhead crane contactor adhesion alarm device further includes a first standby circuit. The first standby circuit includes a second contactor. A third normally open button is also provided inside the composite button. The coil of the second contactor in the first standby circuit is connected in parallel with the third normally open button and then connected in series with the normally open contact of the second first contactor. The normally closed main contact of the second contactor is connected in series with the normally open main contact of the first contactor.

[0011] Preferably, the first standby circuit further includes a third warning lamp. The third warning lamp is connected in series with the normally open contact of the second contactor.

[0012] Preferably, a first short - circuit prevention load circuit is connected in series with the first standby circuit. Two circuit loads are provided inside the first short - circuit prevention load circuit. A second normally closed button is also provided inside the composite button. The first circuit load is connected in series with the second normally closed button and then connected in parallel with the second circuit load.

[0013] Preferably, the overhead crane contactor adhesion alarm device further includes a second standby circuit. The second standby circuit includes a third contactor. A fourth normally open button is also provided inside the composite button. The coil of the third contactor in the second standby circuit is connected in parallel with the normally open contact of the third first contactor and then connected in series with the fourth normally open button. The normally open main contact of the third contactor is connected in parallel with the normally open main contact of the first contactor.

[0014] Preferably, the normally closed contact of the third contactor is connected in series with the coil of the first contactor.

[0015] Preferably, the second standby circuit further includes a fourth warning lamp. The fourth warning lamp is connected in series with the normally open contact of the third contactor.

[0016] Preferably, a second short - circuit prevention load circuit is connected in series with the second standby circuit. Two circuit loads are provided inside the second short - circuit prevention load circuit. The first circuit load is connected in series with the normally closed contact of the second first contactor and then connected in parallel with the second circuit load.

[0017] Preferably, the composite button is replaced by a fourth contactor. Four groups of normally open contacts are provided inside the fourth contactor to replace the first normally open button, the second normally open button, the third normally open button, and the fourth normally open button respectively. A set of normally closed contacts is provided on the fourth contactor to replace the first normally closed button. The fourth contactor is provided with a self - locking circuit.

[0018] The technical solution of the present utility model controls the power supply of the first contactor coil through a composite button, connects the composite button reflecting the energization condition of the first contactor coil and the normally open contact and the normally closed contact of the first contactor reflecting the braking condition of the first contactor. When the first contactor is stuck, the relationship between the state of the composite button and the state of the contact is different from the normal working state, and the alarm is powered by the circuit in the stuck state to realize the alarm process and improve the safety during use. Description of the Drawings

[0019] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is the circuit schematic diagram of a crane contactor sticking alarm device of the present utility model;

[0021] Figure 2 It is the circuit schematic diagram of the crane drive circuit in the present utility model;

[0022] Figure 3 It is the circuit schematic diagram of the first standby circuit in the present utility model;

[0023] Figure 4 It is the circuit schematic diagram of the second standby circuit in the present utility model;

[0024] Figure 5 It is the circuit schematic diagram after replacing the composite button with the fourth contactor in the present utility model.

[0025] Description of the Reference Numerals:

[0026] 01. Starting circuit; 02. Detection circuit; 03. First standby circuit; 04. Second standby circuit; 05. Self-locking circuit; 31. First short-circuit prevention load circuit; 41. Second short-circuit prevention load circuit; HL1. First indicator light; HL2. Second indicator light; HL3. Third indicator light; HL4. Fourth indicator light; KM1. Coil of the first contactor; KM1-1. Normally open contact of the first contactor; KM1-2. Normally closed contact of the first contactor; KM1-3. Normally open main contact of the first contactor; KM2. Coil of the second contactor; KM2-1. Normally closed main contact of the second contactor; KM2-2. Normally open contact of the second contactor; KM3. Coil of the third contactor; KM3-1. Normally open main contact of the third contactor; KM3-2. Normally closed contact of the third contactor; KM3-3. Normally open contact of the third contactor; KM4. Fourth contactor; KM4-1. Normally closed contact of the fourth contactor; KM4-2. Normally open contact of the fourth contactor. Detailed implementation manner

[0027] The technical solutions of the present utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative work shall fall within the protection scope of the present utility model.

[0028] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0029] In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically defined. In addition, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] Combined with Figures 1 to 5 As shown, a crane contactor adhesion alarm device provided by the present utility model includes a start circuit 01 and a detection circuit 02.

[0031] Combined with Figures 1 to 5 As shown, the start circuit 01 includes a first normally open button and a first contactor, and the first normally open button and the coil KM1 of the first contactor are connected in series; the detection circuit 02 includes a second normally open button, a first normally closed button, and an alarm, and the second normally open button, the first normally closed button, and the alarm are connected in series in sequence. The second normally open button is connected in parallel with the normally open contact KM1-1 of the first contactor, and the first normally closed button is connected in parallel with the normally closed contact KM1-2 of the first contactor; the first normally open button, the second normally open button, and the first normally closed button are arranged in the same composite button, and the normally open main contact KM1-3 of the first contactor is connected in series in the crane drive circuit.

[0032] In this embodiment, the composite button controls the power supply of the coil KM1 of the first contactor, connects the composite button reflecting the energization condition of the coil KM1 of the first contactor and the normally open contact KM1-1 and the normally closed contact KM1-2 of the first contactor reflecting the braking condition of the first contactor. When the first contactor is in an adhesive state, the relationship between the state of the composite button and the state of the contact is different from the normal working state, and the alarm is powered through the circuit in the adhesive state to realize the alarm process and improve the safety during use.

[0033] In some embodiments, combined with Figure 1As shown, the alarm includes a first warning light HL1 and a second warning light HL2. The first warning light HL1 and the normally closed contact KM1-2 of the first contactor are connected in series and then connected in parallel with the first normally closed button. The second warning light HL2 and the normally open contact KM1-1 of the first contactor are connected in series and then connected in parallel with the second normally open button. The first warning light HL1 is used for the alarm of power-on and inability to brake, and the second warning light HL2 is used for the alarm of power-off and inability to brake, realizing separate alarms for different adhesion situations and helping the operator to more clearly understand the working state of the circuit.

[0034] In some embodiments, in combination with Figure 3 As shown, the overhead crane contactor adhesion alarm device further includes a first standby circuit 03. The first standby circuit 03 includes a second contactor. A third normally open button is further provided inside the composite button. The coil KM2 of the second contactor in the first standby circuit 03 is connected in parallel with the third normally open button and then connected in series with the normally open contact KM1-1 of the second first contactor. The normally closed main contact KM2-1 of the second contactor is connected in series with the normally open main contact KM1-3 of the first contactor. The function of the first standby circuit 03 is that when the first contactor is powered off and unable to brake, the overhead crane drive circuit is interrupted by braking through the normally closed main contact KM2-1 of the second contactor, indirectly realizing the effect of power-off braking of the first contactor and enabling the normal operation of the overhead crane when the first contactor is adhered, and winning the ability for the overhead crane to dock.

[0035] In this embodiment, only when the first contactor is powered off and unable to brake can the coil KM2 of the second contactor be powered. The normally closed main contact KM2-1 of the second contactor brakes to replace the normally open main contact KM1-3 of the first contactor to cut off the overhead crane drive circuit by power-off braking.

[0036] In some embodiments, in combination with Figure 3 As shown, the first standby circuit 03 further includes a third warning light HL3. The third warning light HL3 is connected in series with the normally open contact KM2-2 of the second contactor. The third warning light HL3 lights up when the coil KM2 of the second contactor is powered, indicating the working state of the first standby circuit 03 to the operator, and cooperating with the second warning light HL2 can avoid the problem of failure of these two warning lights.

[0037] In some embodiments, in combination with Figure 3As shown, a first short-circuit prevention load circuit 31 is connected in series to the first standby circuit 03. There are two circuit loads in the first short-circuit prevention load circuit 31. A second normally closed button is also provided in the composite button. After the first circuit load is connected in series with the second normally closed button, it is connected in parallel with the second circuit load. The first standby circuit 03 is in a short-circuit state after the first contactor is normally powered and braked. The load connected in series to the first standby circuit 03 can protect the first standby circuit 03, but the load will have a voltage division effect on the power supply during the power supply process for the coil KM2 of the second contactor. The first short-circuit prevention load circuit 31 presents different resistance values when powering the coil KM2 of the second contactor and protecting the first standby circuit 03, ensuring the protection effect without affecting the power supply.

[0038] In some embodiments, in combination with Figure 4 As shown, the overhead crane contactor adhesion alarm device further includes a second standby circuit 04. The second standby circuit 04 includes a third contactor. A fourth normally open button is also provided in the composite button. The coil KM3 of the third contactor in the second standby circuit 04 is connected in parallel with the normally open contact KM1-1 of the first contactor and then connected in series with the fourth normally open button. The normally open main contact KM3-1 of the third contactor is connected in parallel with the normally open main contact KM1-3 of the first contactor. The function of the second standby circuit 04 is that when the first contactor is powered on and cannot be braked, the normally open main contact KM3-1 of the third contactor brakes and conducts the overhead crane drive circuit, indirectly realizing the effect of the first contactor being powered on and braked, achieving the normal operation of the overhead crane when the first contactor adheres, and providing the overhead crane with the ability to dock.

[0039] In this embodiment, only when the first contactor is powered on and cannot be braked, the power supply to the coil KM3 of the third contactor can be realized. The normally closed main contact KM3-1 of the third contactor brakes to replace the normally open main contact KM1-3 of the first contactor to power on and brake and conduct the overhead crane drive circuit.

[0040] In some embodiments, in combination with Figure 1 As shown, the normally closed contact KM3-2 of the third contactor is connected in series with the coil KM1 of the first contactor. The power supply to the coil KM3 of the third contactor occurs when the first contactor is powered on and cannot be braked. By cutting off the power supply to the coil KM1 of the first contactor through the normally closed contact KM3-2 of the third contactor, the circuit can be protected because continuously powering the coil KM1 of the first contactor may cause problems such as fire.

[0041] In some embodiments, in combination with Figure 4As shown, the second standby circuit 04 further includes a fourth indicator light HL4. The fourth indicator light HL4 is connected in series with the normally open contact KM3-3 of the third contactor. The fourth indicator light HL4 lights up when the coil KM3 of the third contactor is powered, indicating the operating state of the second standby circuit 04 to the operator. Cooperating with the first indicator light HL1 can avoid the problem of failure of these two indicator lights.

[0042] In some embodiments, in combination with Figure 4 As shown, the second standby circuit 04 is connected in series with a second short-circuit protection load circuit 41. The second short-circuit protection load circuit 41 is provided with two circuit loads. The first circuit load is connected in series with the normally closed contact KM1-2 of the second first contactor and then connected in parallel with the second circuit load. The second standby circuit 04 is in a short-circuit state after the first contactor is normally powered and braked. The series load of the second standby circuit 04 can protect the second standby circuit 04, while the load will divide the voltage during the power supply process for the coil KM3 of the third contactor, affecting the power supply. The second short-circuit protection load circuit 41 presents different resistance values when powering the coil KM3 of the third contactor and protecting the second standby circuit 04, ensuring the protection effect without affecting the power supply.

[0043] In some embodiments, in combination with Figure 5 As shown, the composite button is replaced by a fourth contactor. The fourth contactor is provided with four groups of normally open contacts to replace the first normally open button, the second normally open button, the third normally open button, and the fourth normally open button respectively. The fourth contactor is provided with a group of normally closed contacts to replace the first normally closed button. The fourth contactor is provided with a self-locking circuit 05. After using the fourth contactor to replace the composite button and adding the self-locking circuit 05 to the fourth contactor, it is possible to switch the working state of the overhead crane drive circuit by clicking the button once, and to achieve long-term conduction of the overhead crane drive circuit by pressing the composite button for a long time.

[0044] Working process: The first normally open button in the starting circuit 01 is connected in series with the coil KM1 of the first contactor. The working state of the first normally open button is synchronized with the working state of the first contactor.

[0045] Before the adhesion occurs, the conduction states of the second normally open button and the normally open contact KM1-1 of the first contactor are the same, the states of the first normally closed button and the normally closed contact KM1-2 of the first contactor are the same, and the conduction states of the above two series-parallel circuits are always opposite. The detection circuit 02 is always in a non-conducted state.

[0046] When adhesion occurs, the conduction states of the second normally open button and the normally open contact KM1-1 of the first contactor are opposite, and the states of the first normally closed button and the normally closed contact KM1-2 of the first contactor are opposite. There is always a conducting line in the above two series-parallel circuits, and the detection circuit 02 is always in a conducting state; when power-on braking fails, the current passes through the second normally open button, the normally closed contact KM1-2 of the first contactor and the alarm; when power-off braking fails, the current passes through the normally open contact KM1-1 of the first contactor, the first normally closed button and the alarm.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A crane contactor adhesion alarm device, characterized in that: include: A starting circuit (01), the starting circuit (01) comprising a first normally open button and a first contactor, the first normally open button and a coil (KM1) of the first contactor being connected in series; A detection circuit (02), the detection circuit (02) comprising a second normally open button, a first normally closed button and an alarm, the second normally open button, the first normally closed button and the alarm are connected in series in sequence, the second normally open button and the normally open contact (KM1-1) of the first contactor are connected in parallel, and the first normally closed button and the normally closed contact (KM1-2) of the first contactor are connected in parallel; The first normally open button, the second normally open button and the first normally closed button are arranged in the same composite button, and the normally open main contact (KM1-3) of the first contactor is connected in series in the overhead travelling crane driving circuit.

2. The overhead crane contactor adhesion alarm device according to claim 1, characterized in that: The alarm comprises a first warning light (HL1) and a second warning light (HL2); the first warning light (HL1) and the normally closed contact (KM1-2) of the first contactor are connected in series and then connected in parallel with the first normally closed button; the second warning light (HL2) and the normally open contact (KM1-1) of the first contactor are connected in series and then connected in parallel with the second normally open button.

3. The overhead travelling crane contactor adhesion alarm device according to claim 1, characterized in that: The invention also comprises a first standby circuit (03), wherein the first standby circuit (03) comprises a second contactor, wherein the composite button is further provided with a third normally open button, wherein the coil (KM2) of the second contactor in the first standby circuit (03) is connected in parallel with the third normally open button and then in series with the normally open contact (KM1-1) of the second first contactor, and the normally closed main contact (KM2-1) of the second contactor is connected in series with the normally open main contact (KM1-3) of the first contactor.

4. The overhead travelling crane contactor adhesion alarm device according to claim 3, characterized in that: The first backup circuit (03) further comprises a third warning light (HL3), wherein the third warning light (HL3) is connected in series with the normally open contact (KM2-2) of the second contactor.

5. The overhead travelling crane contactor adhesion alarm device according to claim 3, characterized in that: The first standby circuit (03) is connected in series with a first short-circuit proof load circuit (31), two circuit loads are arranged in the first short-circuit proof load circuit (31), and a second normally closed button is also arranged in the composite button, the first circuit load is connected in series with the second normally closed button and then connected in parallel with the second circuit load.

6. The overhead crane contactor adhesion alarm device according to claim 1, characterized in that: The device further comprises a second standby circuit (04), wherein the second standby circuit (04) comprises a third contactor, and the composite button is further provided with a fourth normally open button, wherein the coil (KM3) of the third contactor in the second standby circuit (04) is connected in parallel to the normally open contact (KM1-1) of the third first contactor and then connected in series to the fourth normally open button, and the normally open main contact (KM3-1) of the third contactor is connected in parallel to the normally open main contact (KM1-3) of the first contactor.

7. The overhead travelling crane contactor adhesion alarm device according to claim 6, characterized in that: The normally closed contact (KM3-2) of the third contactor and the coil (KM1) of the first contactor are connected in series.

8. The overhead travelling crane contactor adhesion alarm device according to claim 6, characterized in that: The second backup circuit (04) further comprises a fourth warning light (HL4), wherein the fourth warning light (HL4) is connected in series with a normally open contact (KM3-3) of the third contactor.

9. The overhead travelling crane contactor adhesion alarm device according to claim 6, characterized in that: The second standby circuit (04) is connected in series with a second short-circuit proof load circuit (41), wherein the second short-circuit proof load circuit (41) is provided with two circuit loads, wherein the first circuit load is connected in series with the normally closed contact (KM1-2) of the second first contactor and then connected in parallel with the second circuit load.

10. The overhead travelling crane contactor adhesion alarm device according to claim 1, 3 or 6, characterized in that: The composite button is replaced by a fourth contactor, the fourth contactor is provided with four groups of normally open contacts which respectively replace the first normally open button, the second normally open button, the third normally open button and the fourth normally open button, the fourth contactor is provided with a group of normally closed contacts which replace the first normally closed button, and the fourth contactor is provided with a self-locking circuit (05).

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