Automatic shutdown protection device for power failure of mechanical arm

Abstract

The utility model relates to the technical field of circuit protection devices, and provides a mechanical arm power-off automatic closing protection device. The device comprises a first contactor, a second contactor, a third contactor, a detection circuit, a power supply circuit and a warning circuit, wherein three coils of the three contactors are respectively connected between three live wires and a zero wire of a three-phase power supply of the mechanical arm; three normally-closed contacts on the three contactors are respectively connected in series with three live wires of a three-phase power supply of the mechanical arm, the other ends of the three normally-closed contacts are connected in parallel, and the coil and the normally-closed contact connected on each live wire correspond to different contactors; the warning circuit is connected in series between the power supply circuit and the zero line. According to the mechanical arm power-off automatic closing protection device, a three-phase power supply of an open phase can be used for supplying power to the warning circuit after the open phase occurs, and the warning circuit judges the state of a live wire and transmits the state to an operator.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit protection device technical field especially is related to a mechanical arm power failure automatic closing protection device. BACKGROUND

[0002] Mechanical arm is the mechanical equipment that modern industrial production is commonly used, uses industrial power three -phase power supply, uses control circuit to control its movement. Among them three -phase power has a special fault three -phase power lack phase, namely: three -phase power three fire lines in part fire line power failure.

[0003] In prior art, mainly use lack phase protector to cut off circuit protection circuit accessories when lack phase occurs, and the lack phase problem is that the lack phase protector trips, and the manifestation form is single, and the operator cannot quickly judge the power failure. UTILITY MODEL CONTENT

[0004] The utility model discloses a kind of mechanical arm power failure automatic closing protection devices, which can use three-phase power supply of lack phase after lack phase occurs to power supply warning circuit, and the state of fire line is judged by warning circuit and is passed to operator.

[0005] The utility model provides a kind of mechanical arm power failure automatic closing protection device, comprising:

[0006] First contactor, second contactor and third contactor;

[0007] Detection circuit, the detection circuit includes first contactor coil, second contactor coil and third contactor coil, three fire lines of mechanical arm three-phase power supply are first fire line, second fire line and third fire line, the first contactor coil is connected between first fire line and zero line, the second contactor coil is connected between second fire line and zero line, the third contactor coil is connected between third fire line and zero line;

[0008] Power supply circuit and warning circuit, the power supply circuit includes first contactor first normally closed contact, second contactor first normally closed contact and third contactor first normally closed contact, first fire line is connected into warning circuit after being connected in series with second contactor first normally closed contact, second fire line is connected into warning circuit after being connected in series with third contactor first normally closed contact, third fire line is connected into warning circuit after being connected in series with first contactor first normally closed contact.

[0009] Preferably, the warning circuit includes warning element, and the warning element is a warning light.

[0010] Preferably, the warning circuit is composed of three parallel warning lines, the warning circuit comprises three warning elements, the three warning elements are respectively a first fire line warning element, a second fire line warning element, and a third fire line warning element; the first fire line warning element and a third normally closed contact of a first contactor are connected in series to form a first warning line, the second fire line warning element and a third normally closed contact of a second contactor are connected in series to form a second warning line, and the third fire line warning element and a third normally closed contact of a third contactor are connected in series to form a third warning line.

[0011] Preferably, the power supply circuit further comprises two circuit loads, a first circuit load is connected in series with one end of a first normally closed contact of the first contactor, and a second circuit load is connected in series with one end of a first normally closed contact of the second contactor.

[0012] Preferably, the power supply circuit further comprises a third circuit load connected in series with one end of a first normally closed contact of the third contactor.

[0013] Preferably, a buffer circuit is further connected in series between the power supply circuit and the warning circuit, the buffer circuit comprises a second normally open contact of the first contactor, a second normally open contact of the second contactor, and a second normally open contact of the third contactor which are connected in parallel with each other.

[0014] Preferably, the mechanical arm power-off automatic closing protection device further comprises a phase loss protector, an input end of the phase loss protector is connected to a three-phase power supply of the mechanical arm, and an output end of the phase loss protector is connected to the mechanical arm.

[0015] Preferably, the control circuit of the mechanical arm is provided with a default fire line, the default fire line is connected in parallel with the power supply circuit, the warning circuit and the control circuit are connected in series after being connected in parallel, and the warning circuit and the control circuit are in a parallel relationship.

[0016] Preferably, the default fire line is connected in series with a fourth normally open contact of the first contactor, a fourth normally open contact of the second contactor, and a fourth normally open contact of the third contactor in sequence, and then connected in parallel with the power supply circuit.

[0017] Preferably, the warning circuit further comprises a cutoff circuit connected in series, the control circuit is connected in parallel after the warning circuit is connected in series with the cutoff circuit, and the cutoff circuit comprises a fifth normally closed contact of the first contactor, a fifth normally closed contact of the second contactor, and a fifth normally closed contact of the third contactor which are connected in parallel with each other.

[0018] The technical scheme of the utility model discloses through the coil of first contactor, second contactor and third contactor is connected respectively between the three live wires and zero line of mechanical arm three -phase power supply, the state of three contactors can reflect the energized state of three live wires, this is detection circuit;Power supply circuit uses three live wires to cooperate three contactor normally closed contact point and supplies power to warning circuit, realizes three -phase power supply normal state power supply circuit interruption, in three -phase power supply open phase state always and only one live wire supplies power to warning circuit, and the use operator can judge the state of live wire through warning circuit quickly. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in prior art, the following will briefly introduce the drawing needed to be used in the specific embodiment or prior art description, obviously, the drawing in the following description is some embodiment of the utility model, and for ordinary skilled person in the art, other drawings can also be obtained according to these drawings without creating labor.

[0020] Figure 1 It is the circuit schematic diagram of power supply circuit (2) in the utility model of a kind of mechanical arm power-off automatic closing protection device;

[0021] Figure 2 It is the circuit schematic diagram of detection circuit (1) in the utility model of a kind of mechanical arm power-off automatic closing protection device;

[0022] Figure 3 It is Figure 1 It is the circuit schematic diagram of warning circuit (3) in the utility model of a kind of mechanical arm power-off automatic closing protection device;

[0023] EXPLANATION OF REFERENCE NUMERALS:

[0024] 1, detection circuit;2, power supply circuit;3, warning circuit;4, control circuit;5, open phase protector;6, buffer circuit;7, cut-off circuit;

[0025] KM1, first contactor coil;KM1-1, first contactor first normally closed contact;KM1-2, first contactor second normally open contact;KM1-3, first contactor third normally closed contact;KM1-4, first contactor fourth normally open contact;

[0026] KM2, second contactor coil;KM2-1, second contactor first normally closed contact;KM2-2, second contactor second normally open contact;KM2-3, second contactor third normally closed contact;KM2-4, second contactor fourth normally open contact;

[0027] KM3, third contactor coil; KM3-1, third contactor first normally closed contact; KM3-2, third contactor second normally open contact; KM3-3, third contactor third normally closed contact; KM3-4, third contactor fourth normally open contact;

[0028] L0, default hot line; L1, first hot line; L2, second hot line; L3, third hot line; R, circuit load; HL1, first hot line warning element; HL2, second hot line warning element; HL3, third hot line warning element. DETAILED DESCRIPTION

[0029] The technical solutions of the utility model will be described below in conjunction with the embodiments, obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without making creative labor belong to the protection scope of the utility model.

[0030] In the description of the utility model, it is 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" and the like are the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0031] In the description of the utility model, it is understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited. In addition, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For the ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] In conjunction with Figures 1 to 3As shown, the utility model provides a kind of mechanical arm power-off automatic closing protection device, including first contactor (not drawn in the figure), second contactor (not drawn in the figure), third contactor (not drawn in the figure), detection circuit 1, power supply circuit 2 and warning circuit 3.

[0033] In combination Figures 1 to 3 As shown, the three-phase power supply of mechanical arm includes zero line, first live wire L1, second live wire L2 and third live wire L3, the first contactor coil KM1 is connected in series between first live wire L1 and zero line, the second contactor coil KM2 is connected in series between second live wire L2 and zero line, the third contactor coil KM3 is connected in series between third live wire L3 and zero line, and thus detection circuit 1, each live wire is powered after being powered on to supply power to the corresponding coil to make the corresponding contactor attract.

[0034] The first live wire L1 is connected in series with the second contactor first normally closed contact KM2-1 to form the first power supply circuit, the second live wire L2 is connected in series with the third contactor first normally closed contact KM3-1 to form the second power supply circuit, and the third live wire L3 is connected in series with the first contactor first normally closed contact KM1-1 to form the third power supply circuit; the above three power supply circuits are connected in parallel and then connected in series with the warning circuit 3, and the other end of the warning circuit 3 is connected to the zero line, thus realizing the power supply of the power supply circuit 2 to the warning circuit 3.

[0035] When no live wire is powered off, the three live wires are not connected to the warning circuit 3, and the warning effect is not triggered; when the first live wire L1 is powered off, the third live wire L3 supplies power to the warning circuit 3, when the second live wire L2 is powered off, the first live wire L1 supplies power to the warning circuit 3, and when the third live wire L3 is powered off, the second live wire L2 supplies power to the warning circuit 3; when the first live wire L1 and the second live wire L2 are powered off at the same time, the third live wire L3 supplies power to the warning circuit 3, when the first live wire L1 and the third live wire L3 are powered off at the same time, the second live wire L2 supplies power to the warning circuit 3, and when the second live wire L2 and the third live wire L3 are powered off at the same time, the first live wire L1 supplies power to the warning circuit 3.

[0036] In this embodiment, the coils of the first contactor, the second contactor and the third contactor are connected between the three live wires and the zero line of the three-phase power supply of mechanical arm, so that the state of the three contactors can reflect the power-on state of the three live wires, which is the detection circuit 1; the power supply circuit 2 uses the three live wires to cooperate with the normally closed contacts on the three contactors to supply power to the warning circuit 3, realizes the interruption of the power supply circuit 2 in the normal state of the three-phase power supply, and always has and only one live wire to supply power to the warning circuit 3 in the open-phase state of the three-phase power supply, so that the operator can quickly judge the state of the live wire through the warning circuit 3.

[0037] In this embodiment, it needs to be particularly noted that the coil and the normally closed contact connected by each live wire correspond to different contactors.

[0038] In some embodiments, in combination with Figure 3 As shown, the warning circuit 3 includes three warning elements, which are respectively a first hot line warning element HL1, a second hot line warning element HL2, and a third hot line warning element HL3; the first hot line warning element HL1 is connected in series with the third normally closed contact KM1-3 of the first contactor to form a first warning line, the second hot line warning element HL2 is connected in series with the third normally closed contact KM2-3 of the second contactor to form a second warning line, and the third hot line warning element HL3 is connected in series with the third normally closed contact KM3-3 of the third contactor to form a third warning line, and the three warning elements are respectively responsible for the power-off warning task of the three hot lines, and the warning element is preferably a warning lamp, which is convenient for the operator to observe.

[0039] In some embodiments, in combination with Figure 3 As shown, the power supply circuit 2 further includes circuit loads R, and the number of the circuit loads R is three, and the three circuit loads R are respectively connected in series with the first normally closed contact KM1-1 of the first contactor, the first normally closed contact KM2-1 of the second contactor, and the first normally closed contact KM3-1 of the third contactor. The addition of the above-mentioned circuit loads R can effectively protect the power supply circuit 2; because the braking of the contactor is slightly slower than the power-on speed, under the condition that there is no hot line power-off, the warning circuit 3 is briefly powered on at the moment of power-on of the circuit, at this time, the three hot lines are in a short-circuit state, and the circuit load R can prevent the above-mentioned phenomenon.

[0040] In the embodiment, the number of the circuit loads R is at least two, that is, any one of the above-mentioned three circuit loads R can be removed, and the problem of short circuit of the power supply circuit 2 can still be avoided, for example, the number of the circuit loads R is two, and the two circuit loads R are respectively connected in series with the first normally closed contact KM1-1 of the first contactor and the first normally closed contact KM2-1 of the second contactor, but the use of two circuit loads R will cause the driving voltage of the warning circuit 3 to be unstable, so the normal number of the circuit loads R is three.

[0041] In some embodiments, in combination with Figure 3 As shown, the power supply circuit 2 and the warning circuit 3 are further connected in series with the second normally open contact KM1-2 of the first contactor, the second normally open contact KM2-2 of the second contactor, and the second normally open contact KM3-2 of the third contactor, and the above-mentioned three normally open contacts are connected in parallel; the addition of this part of the line can effectively protect the warning circuit 3 and prolong the service life of the electronic elements in the warning circuit 3; because the braking of the contactor is slightly slower than the power-on speed, under the condition that there is no hot line power-off, the warning circuit 3 is briefly powered on at the moment of power-on of the circuit, and this part of the line can prevent the above-mentioned phenomenon, and at the same time, will not affect the conduction of the warning circuit 3 under the condition of hot line power-off.

[0042] In some embodiments, in combination Figure 2 As shown, the mechanical arm power-off automatic shutdown protection device also includes an open-phase protector 5, which can trip to cut off the circuit to avoid damage to the circuit elements after monitoring the open-phase of the three-phase power supply. Therefore, the open-phase protector 5 needs to be connected in series between the three-phase power supply of the mechanical arm and the mechanical arm. The detection circuit 1 and the open-phase protector 5 are connected in parallel to avoid the open-phase protector 5 cutting off the power supply of the power supply circuit 2.

[0043] In some embodiments, in combination Figure 1 As shown, the power supply circuit 2 can also supply power to the control circuit 4 of the mechanical arm to avoid the control circuit 4 losing information due to abnormal power-off. Here, the control circuit 4 specifically refers to the control computer of the mechanical arm. Because the control computer will lose information due to abnormal power-off, the mechanical arm cannot continue the work before the abnormal power-off after being powered on again.

[0044] In this embodiment, the default live wire L0 is connected in series with the first contactor fourth normally open contact KM1-4, the second contactor fourth normally open contact KM2-4, and the third contactor fourth normally open contact KM3-4 in turn, and the overall circuit connected in parallel with the power supply circuit 2 forms the front half of the circuit; the warning circuit 3 is connected in series with the cutoff circuit 7, and the overall circuit connected in parallel with the control circuit 4 forms the back half of the circuit, and the two parts of the circuit are connected in series.

[0045] The cutoff circuit 7 includes three normally closed contacts connected in parallel, namely the first contactor fifth normally closed contact KM1-5, the second contactor fifth normally closed contact KM2-5, and the third contactor fifth normally closed contact KM3-5. The cutoff circuit 7 can avoid the default live wire L0 supplying power to the warning circuit 3, which can cause false alarms.

[0046] The default live wire L0 here is not the fourth live wire, but any one of the three live wires in the three-phase power supply of the mechanical arm. Because in the default state, the control circuit 4 of the mechanical arm uses any one of the three live wires to supply power.

[0047] In this embodiment, if the open-phase protector 5 cannot cut off the connection between the default live wire L0 and the control circuit 4 of the mechanical arm, the first contactor fourth normally open contact KM1-4, the second contactor fourth normally open contact KM2-4, and the third contactor fourth normally open contact KM3-4 need to be connected in series between the default live wire L0 and the control circuit 4 of the mechanical arm. If the open-phase protector 5 can cut off the connection between the default live wire L0 and the control circuit 4 of the mechanical arm, the normally open contacts do not need to be connected in series. The function of this part of the circuit is to avoid short circuit between live wires during power supply to the control circuit 4 of the mechanical arm.

[0048] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A robotic arm automatic shutdown protection device in the event of power failure, characterized in that, include: First contactor, second contactor, and third contactor; The detection circuit (1) includes a first contactor coil (KM1), a second contactor coil (KM2) and a third contactor coil (KM3). The three live wires of the three-phase power supply of the robotic arm are the first live wire (L1), the second live wire (L2) and the third live wire (L3). The first contactor coil (KM1) is connected between the first live wire (L1) and the neutral wire, the second contactor coil (KM2) is connected between the second live wire (L2) and the neutral wire, and the third contactor coil (KM3) is connected between the third live wire (L3) and the neutral wire. The power supply circuit (2) and the warning circuit (3) are provided. The power supply circuit (2) includes the first normally closed contact of the first contactor (KM1-1), the first normally closed contact of the second contactor (KM2-1) and the first normally closed contact of the third contactor (KM3-1). The first live wire (L1) is connected in series with the first normally closed contact of the second contactor (KM2-1) and then connected to the warning circuit (3). The second live wire (L2) is connected in series with the first normally closed contact of the third contactor (KM3-1) and then connected to the warning circuit (3). The third live wire (L3) is connected in series with the first normally closed contact of the first contactor (KM1-1) and then connected to the warning circuit (3).

2. The automatic power-off protection device for the robotic arm according to claim 1, characterized in that, The warning circuit (3) includes a warning element, which is a warning light.

3. The automatic shutdown protection device for a robotic arm in the event of a power failure as described in claim 2, characterized in that, The warning circuit (3) consists of three parallel warning lines. The warning circuit (3) includes three warning elements, namely a first live wire warning element (HL1), a second live wire warning element (HL2), and a third live wire warning element (HL3). The first live wire warning element (HL1) is connected in series with the third normally closed contact (KM1-3) of the first contactor to form the first warning line. The second live wire warning element (HL2) is connected in series with the third normally closed contact (KM2-3) of the second contactor to form the second warning line. The third live wire warning element (HL3) is connected in series with the third normally closed contact (KM3-3) of the third contactor to form the third warning line.

4. The automatic power-off protection device for the robotic arm according to claim 1, characterized in that, The power supply circuit (2) also includes a circuit load (R), and there are two circuit loads (R). The first circuit load (R) is connected in series with one end of the first normally closed contact (KM1-1) of the first contactor, and the second circuit load (R) is connected in series with one end of the first normally closed contact (KM2-1) of the second contactor.

5. The automatic shutdown protection device for a robotic arm in the event of a power failure as described in claim 4, characterized in that, The power supply circuit (2) also includes a third circuit load (R), which is connected in series with one end of the first normally closed contact (KM3-1) of the third contactor.

6. The automatic shutdown protection device for a robotic arm in the event of a power failure as described in claim 1, characterized in that, A buffer circuit (6) is connected in series between the power supply circuit (2) and the warning circuit (3). The buffer circuit (6) includes a first contactor second normally open contact (KM1-2), a second contactor second normally open contact (KM2-2), and a third contactor second normally open contact (KM3-2) connected in parallel.

7. The automatic shutdown protection device for a robotic arm in the event of a power failure as described in claim 1, characterized in that, It also includes a phase loss protector (5), the input of which is connected to the three-phase power supply of the robotic arm, and the output of which is connected to the robotic arm.

8. The automatic shutdown protection device for a robotic arm in the event of a power failure as described in claim 1, characterized in that, The control circuit (4) of the robotic arm is provided with a default live wire (L0). The default live wire (L0) and the power supply circuit (2) are connected in parallel and then connected in series with the warning circuit (3) and the control circuit (4). The warning circuit (3) and the control circuit (4) are connected in parallel.

9. The automatic shutdown protection device for a robotic arm in the event of a power failure as described in claim 8, characterized in that, The default live wire (L0) is connected in parallel with the power supply circuit (2) after being connected in series with the fourth normally open contact of the first contactor (KM1-4), the fourth normally open contact of the second contactor (KM2-4), and the fourth normally open contact of the third contactor (KM3-4).

10. The automatic shutdown protection device for a robotic arm in the event of a power failure as described in claim 8, characterized in that, The warning circuit (3) is also connected in series with a cut-off circuit (7). The warning circuit (3) is connected in series with the cut-off circuit (7) and then connected in parallel with the control circuit (4). The cut-off circuit (7) includes the fifth normally closed contact of the first contactor (KM1-5), the fifth normally closed contact of the second contactor (KM2-5), and the fifth normally closed contact of the third contactor (KM3-5) connected in parallel with each other.

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