CN220845185U

CN220845185U - Inching control circuit based on contactor control and crane

Info

Publication number: CN220845185U
Application number: CN202322782781.1U
Authority: CN
Inventors: 卢丽莎; 黄晓琳; 黄艳平; 陈珂
Original assignee: Henan Mine Crane Co Ltd
Current assignee: Henan Mine Crane Co Ltd
Priority date: 2023-10-17
Filing date: 2023-10-17
Publication date: 2024-04-26
Anticipated expiration: 2033-10-17

Abstract

The utility model provides an inching control circuit based on contactor control and a crane, the inching control circuit based on contactor control comprises: a main loop and a control loop; the main loop comprises a positive-switching contactor, a reverse-switching contactor and a motor, wherein the positive-switching contactor main contact is connected with the motor in series, and the positive-switching contactor main contact is connected with the reverse-switching contactor main contact in parallel; the control loop comprises a forward rotation loop, a reverse rotation loop, an inching first loop, an inching second loop and an inching third loop; according to the utility model, inching control of the crane motor can be realized by adding the inching switch, the inching contactor, the delay contactor and the intermediate relay, and the inching distance of the crane can be adjusted by adjusting the electrifying delay time of the delay contactor and matching with the crane running speed control, so that different use requirements are met, and the equipment cost is low.

Description

Inching control circuit based on contactor control and crane

Technical Field

The utility model belongs to the technical field of cranes, and particularly relates to a inching control circuit based on contactor control and a crane.

Background

In order to cope with different production needs, more and more users require the crane to have inching function, namely, when inching and running commands are executed, the crane automatically stops after fixed running for a certain distance.

Currently, the inching function is generally realized through a PLC, and the equipment cost is high.

Disclosure of utility model

Aiming at the defects existing in the prior art, the utility model provides a inching control circuit based on contactor control and a crane with lower equipment cost.

The technical scheme of the utility model is as follows: inching control circuit based on contactor control includes:

A main loop and a control loop;

The main loop comprises a positive-switching contactor, a reverse-switching contactor and a motor, wherein the positive-switching contactor main contact is connected with the motor in series, and the positive-switching contactor main contact is connected with the reverse-switching contactor main contact in parallel;

The control loop comprises a forward rotation loop, a reverse rotation loop, an inching first loop, an inching second loop and an inching third loop;

the inching first loop is provided with an inching switch and an inching contactor which are connected in series between the direct-current power supplies;

The inching second loop is provided with a positive-transfer contactor auxiliary normally-open contact, an inching contactor auxiliary normally-open contact and a time delay contactor which are connected in series between direct-current power supplies, and a reverse-rotation contactor auxiliary normally-open contact is connected in parallel on the positive-rotation contactor auxiliary normally-open contact;

The inching third loop is provided with a time-delay contactor auxiliary normally-open contact and an intermediate relay which are connected in series between the direct-current power supplies;

The forward rotating loop is provided with a forward rotating button, an auxiliary normally-closed contact of the intermediate relay and a forward rotating contactor which are connected in series;

the reversing loop is provided with a reversing button, an auxiliary normally-closed contact of the intermediate relay and a reversing contactor which are connected in series.

The forward loop and the reverse loop are interlocked.

The reverse contactor auxiliary normally-closed contact is connected in series in the forward rotation loop, and the forward contactor auxiliary normally-closed contact is connected in series in the reverse rotation loop.

And a first limit switch is connected in series in the forward rotation loop.

And a second limit switch is connected in series in the reversing loop.

A crane having a inching control circuit based on contactor control as claimed in any one of the preceding claims.

The utility model has the beneficial effects that: according to the utility model, inching control of the crane motor can be realized by adding the inching switch, the inching contactor, the delay contactor and the intermediate relay, and the inching distance of the crane can be adjusted by adjusting the electrifying delay time of the delay contactor and matching with the crane running speed control, so that different use requirements are met, and the equipment cost is low.

Drawings

Fig. 1 is a circuit diagram of a main circuit in the present utility model.

Fig. 2 is a circuit diagram of a control loop in the present utility model.

Detailed Description

Various exemplary embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative, and is in no way intended to limit the utility model, its application, or uses. The present utility model may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments should be construed as exemplary only and not limiting unless otherwise specifically stated.

The terms "first," "second," and the like, as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises" and the like means that elements preceding the word encompass the elements recited after the word, and not exclude the possibility of also encompassing other elements. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

As shown in fig. 1 and 2, the inching control circuit based on contactor control includes: a main loop and a control loop; the main circuit comprises a forward rotating contactor KM1, a reverse rotating contactor KM2, a motor M1d and a motor M2d, wherein a main contact of the forward rotating contactor KM1 is connected with the motor in series, and a main contact of the reverse rotating contactor KM2 is connected with the main contact of the forward rotating contactor KM1 in parallel; the control loop comprises a forward rotation loop, a reverse rotation loop, an inching first loop, an inching second loop and an inching third loop; the inching first loop is provided with an inching switch S3 and an inching contactor KM6 which are connected in series between the direct current power supplies; the inching second loop is provided with a positive switching contactor KM1 auxiliary normally-open contact, an inching contactor KM6 auxiliary normally-open contact and a time delay contactor KM11 which are connected in series between the direct current power supplies, and a reverse switching contactor KM2 auxiliary normally-open contact is connected in parallel with the positive switching contactor KM1 auxiliary normally-open contact; the inching third loop is provided with a time delay contactor KM11 auxiliary normally open contact and an intermediate relay KM12 which are connected in series between the direct current power supplies; the forward rotating loop is provided with a forward rotating button S1, an auxiliary normally-closed contact of an intermediate relay KM12 and a forward rotating contactor KM1 which are connected in series; the reversing loop is provided with a reversing button S2, an auxiliary normally-closed contact of an intermediate relay KM12 and a reversing contactor KM2 which are connected in series; in the above embodiment, when inching is controlled, the inching switch S3 is closed, the coil of the inching contactor KM6 is energized, the forward rotating button S1 is pressed, the coils of the forward rotating contactor KM1 and the delay contactor KM11 are energized, the motor rotates forward, after the set time of energizing delay contactor KM11 and delaying time, the delay contact of delay contactor KM11 is closed, the coil of intermediate relay KM12 is energized, the normally closed point of intermediate relay KM12 in the forward rotating loop is normally opened, the motor rotates forward automatically, the button S2 is pressed, the coil of the reverse rotating contactor KM2 and the coil of delay contactor KM11 are energized, the motor rotates reversely, after the set time of energizing delay contactor KM11 and delaying time, the delay contact of delay contactor KM11 is closed, the coil of intermediate relay KM12 is energized, the normally closed point of intermediate relay KM12 in the reverse rotating loop is normally opened, and the motor rotates reversely automatically stopped.

In the above embodiment, the inching distance is the product of the crane running speed and the energizing delay time of the delay contactor KM11, and when in use, the delay time is set according to the actual situation on site, so as to adjust the running distance before the crane automatically stops, that is, the inching distance. When inching is not used, coils of the inching contactor KM6, the delay contactor KM11 and the intermediate relay KM12 are not electrified, the forward rotation button S1 is pressed, the forward rotation contactor KM1 is electrified and attracted, and the motor rotates forward; when the reversing button S2 is pressed, the reversing contactor KM2 is electrified to be attracted, and the motor reverses.

In the above embodiment, inching control of the crane motor can be realized by adding the inching switch S3, the inching contactor KM6, the delay contactor KM11 and the intermediate relay KM12, and the inching distance of the crane can be adjusted by adjusting the power-on delay time of the delay contactor KM11 and matching with the crane running speed control, so that different use requirements are met and the equipment cost is low.

In some embodiments, the interlock between the forward and reverse loops prevents shorting of the power supply; specifically, an auxiliary normally-closed contact of the reverse contactor KM2 is connected in series in the forward rotation loop, and an auxiliary normally-closed contact of the forward rotation contactor KM1 is connected in series in the reverse rotation loop.

In some embodiments, a first limit switch S91 is connected in series in the forward loop, and the first limit switch S91 is triggered when the crane moves to the end in the forward direction, so that the forward loop is disconnected, and collision caused by continuous movement of the crane is avoided.

In some embodiments, a second limit switch S92 is connected in series in the reversing loop, and the second limit switch S92 is triggered when the crane moves to the tail end in the reverse direction, so that the reversing loop is disconnected, and collision caused by continuous movement of the crane is avoided.

In some embodiments, a crane is disclosed having a contactor control based inching control circuit as in any of the above.

Thus, various embodiments of the present utility model have been described in detail. In order to avoid obscuring the concepts of the utility model, some details known in the art have not been described. How to implement the solutions disclosed herein will be fully apparent to those skilled in the art from the above description.

The above examples only represent some embodiments of the utility model, which are described in more detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. An inching control circuit based on contactor control is characterized by comprising:

A main loop and a control loop;

2. The contactor control based inching control circuit according to claim 1, wherein: the forward loop and the reverse loop are interlocked.

3. The contactor control based inching control circuit according to claim 2, wherein: the reverse contactor auxiliary normally-closed contact is connected in series in the forward rotation loop, and the forward contactor auxiliary normally-closed contact is connected in series in the reverse rotation loop.

4. The contactor control based inching control circuit according to claim 1, wherein: and a first limit switch is connected in series in the forward rotation loop.

5. The contactor control based inching control circuit according to claim 1, wherein: and a second limit switch is connected in series in the reversing loop.

6. A crane, characterized in that: an inching control circuit based on contactor control as claimed in any one of claims 1 to 5.