A carbon brush wear alarm device for hoisting winding motor

Abstract

The application provides a hoist winding motor carbon brush wear alarm device, and belongs to the field of motors. The switch is connected to the single-chip microcomputer through a connecting structure, and the insulating ball and the switch are connected through contact. The insulating ball, the connecting structure and the switch are die-cast in the machine body. The connecting structure is led out through the upper end of the machine body by two lead wires which are parallel to each other and form a right angle. The insulating ball and the switch are located at a corner of the bottom of the machine body, and a square protrusion is arranged at the position. Half of the insulating ball is located on the square protrusion. The fixing device adopts a wedge and a shell. The outer side of the brush box is provided with a notch which has the same size as the square protrusion at the bottom of the machine body. The shell is fixed to the outer side of the brush box. The switch contact device is inserted into the shell, and the protrusion of the machine body is inserted into the notch of the brush box. The wedge is tightly embedded in the shell at the rear side of the switch contact device. The hoist winding motor carbon brush wear alarm device avoids the waste of manpower for checking the carbon brush during the maintenance process, avoids the risk of contact, and improves the production efficiency.

Description

TECHNICAL FIELD

[0001] The application relates to a carbon brush wear alarm device for a hoisting winding motor and belongs to the motor field. BACKGROUND

[0002] YZR series hoisting and metallurgical winding rotor motors rotate to contact and power through a current collector ring and a brush holder device, and the carbon brush and the current collector ring are necessarily worn due to basic friction, and since the crane is located at a high position, the carbon brush service life line needs to be frequently checked by climbing, which brings many problems to actual maintenance. SUMMARY

[0003] The application aims at solving the problem that the carbon brush wear condition of the YZR motor needs to be checked by climbing due to the high position of the crane, and further provides a carbon brush wear alarm device for a hoisting winding motor.

[0004] The application is achieved by the following technical scheme.

[0005] A carbon brush wear alarm device for a hoisting winding motor comprises a switch contact device, a fixing device and a single-chip microcomputer, the switch contact device comprises an insulating ball, a switch and a connecting structure, the switch is connected to the single-chip microcomputer through the connecting structure, the insulating ball and the switch are in contact connection, the insulating ball, the connecting structure and the switch are die-cast in a machine body, the connecting structure is led out through the upper end of the machine body through two lead wires which are parallel to each other and form a right angle, the insulating ball and the switch are located at a position of a corner of the bottom of the machine body, and the position is provided with a square protrusion, and more than half of the volume of the insulating ball is located on the square protrusion.

[0006] The fixing device adopts a wedge and a shell, the outer side of a brush box is provided with a notch which has the same size as the square protrusion of the bottom of the machine body, the shell is fixed to the outer side of the brush box, the switch contact device is inserted into the shell, and the protrusion of the machine body is inserted into the notch of the brush box, and the wedge is tightly embedded in the rear side of the shell of the switch contact device.

[0007] The single-chip microcomputer receives the switch signal transmitted by the connecting mechanism and judges the condition of the switch according to the switch signal.

[0008] The insulating ball and the switch are in contact connection, and the insulating ball and the switch are pre-tightened through the elastic force generated by the spring in the switch.

[0009] The switch contact device of the carbon brush wear alarm device for the hoisting winding motor is die-cast in the plastic 4330.

[0010] The opening position of the brush box of the carbon brush wear alarm device for the hoisting winding motor is the carbon brush length alarm value.

[0011] This invention relates to a carbon brush wear alarm device for a wound-rotor motor used in cranes. The device monitors the degree of carbon brush wear through a switch contact mechanism and triggers an alarm when the brush reaches the wear alarm position. This avoids the waste of manpower required for carbon brush inspection at heights during maintenance, prevents contact risks, and improves production efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the switch contact device in this invention.

[0013] Figure 2 This is a schematic diagram of a carbon brush wear alarm device for a hoisting wound motor according to the present invention.

[0014] Figure 3 This is a schematic diagram of the overall structure of a carbon brush wear alarm device for a hoisting wound motor according to the present invention.

[0015] Figure 4 This is a schematic diagram of the switch contact device in this invention.

[0016] Figure 5 This is the circuit diagram for Example 3.

[0017] The attached diagram is labeled as follows: 1 is an insulating ball; 2 is the body; 3 is the connecting structure; 4 is a wedge; 5 is a brush box; 6 is a carbon brush; and 7 is a switch. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings: This embodiment is implemented under the premise of the technical solution of the present invention, and detailed implementation methods are given, but the protection scope of the present invention is not limited to the following embodiments.

[0019] Example 1: As Figures 1-4 As shown in the figure, the hoisting wound motor carbon brush wear alarm device involved in this embodiment includes a switch contact device, a fixing device and a microcontroller. The switch contact device includes an insulating ball, a switch and a connecting structure. The switch is connected to the microcontroller through the connecting structure. The insulating ball and the switch are connected by contact. The insulating ball, the connecting structure and the switch are die-cast in the body. The connecting structure uses two parallel right-angled leads to be led out from the upper end of the body. The insulating ball and the switch are located at a corner of the bottom of the body, and a square protrusion is provided at this position. More than half of the volume of the insulating ball is located on the square protrusion, which can ensure that the insulating ball will not fall out of the body.

[0020] The fixing device uses a wedge and a housing. The outside of the brush box has a notch of the same size as the square protrusion at the bottom of the body. The housing is fixed to the outside of the brush box. The switch contact device is inserted into the housing and the protrusion of the body is inserted into the notch of the brush box. The wedge is used to tighten the switch contact device in the housing behind it. The size of the square protrusion does not affect the normal movement of the carbon brush in the brush box and can ensure that the carbon brush contacts the insulating ball.

[0021] The single-chip microcomputer receives the switch signal transmitted by the connecting mechanism, and judges the switch condition according to the switch signal.

[0022] The single-chip microcomputer receives the on and off signals of the switch to judge the carbon block wear condition, and then alarms through the programming (internal program) of the single-chip microcomputer. For example, the single-chip microcomputer sends a low level from the ground pin 1, if the switch is on, the ground pin 2 will receive the low level signal (two lead wires of each set of alarm device are connected to the two ground pin contacts of the single-chip microcomputer), if the switch is off, the ground pin 2 cannot receive the low level, and the single-chip microcomputer alarms.

[0023] As shown in Figure 4 , the insulating ball and the switch are in contact connection, and the insulating ball and the switch are pre-tightened by the elastic force generated by the spring in the switch. The insulating ball and the switch are in close contact through the spring.

[0024] The switch contact device is pressure cast in the pressure plastic 4330, and the whole is integrally pressure cast, has the advantages of quick disassembly and assembly, high degree of generalization, and can be used when plugged in without adjustment, and the whole is replaced when failure occurs. The part of the switch in contact with the insulating ball is located in the switch, and the whole switch and the connecting structure are pressure cast in the pressure plastic, the switch is located in the square protrusion at the bottom of the machine body, and the position of the switch in contact with the insulating ball is flush with the top of the protrusion.

[0025] The opening position of the brush box is the carbon brush length alarm value. When the carbon brush wears beyond a certain position, the insulating ball cannot contact the carbon brush, and the single-chip microcomputer alarms after receiving the switch signal. Because the insulating ball needs to contact the carbon brush to realize the alarm function, the opening position of the brush box is the carbon brush length alarm value.

[0026] Example two: as shown in Figure 2 , the carbon brush wear alarm device for hoist winding motor related by the embodiment is provided with one switch contact device beside each of the original six brush blocks. When the carbon brush normally operates, the carbon brush will press the contact. Because the carbon brush is moved in the brush box under the action of the constant force spring tension, when the length of the carbon brush reaches the alarm value, the carbon brush cannot press the contact, as shown in the right side of Figure 2 . The switch is off, the signal alarms through the single-chip microcomputer, and prompts the position of the carbon brush to be replaced.

[0027] Example three: as shown in Figure 5 , the carbon brush wear alarm device for hoist winding motor related by the embodiment takes the pin of the single-chip microcomputer packaged by PDIP as an example, and the wiring principle diagram of the alarm device is shown in Figure 5As shown, only one of the 6 groups of alarm devices is connected (the rest are the same), one lead of the alarm device is connected to the P0.0 pin of the single-chip microcomputer, the pin is set to high level, and through a thermal relay (which plays a high temperature protection role) and an SB1 switch (a switch in the alarm device, which is turned on by pressing the switch with an insulating ball. When the brush block reaches the wear alarm position, the brush block no longer presses the insulating ball, and the switch rebounds and is disconnected), it is connected to the P2.7 pin. When the SB1 switch is turned on, the high level signal of P0.0 is transmitted to the P2.7 pin, and P2.7 is high level at this time. When the SB1 switch is turned off, the high level signal of P0.0 cannot be transmitted to the P2.7 pin, and P2.7 is low level at this time. The program is set to consider that the motor carbon brush has been worn out and needs to be replaced at this time. The single-chip microcomputer alarms and reminds to replace the carbon brush.

[0028] The above is only a preferred embodiment of the present application, and these embodiments are different implementations based on the overall concept of the present application, and the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A hoist motor carbon brush wear alarm device, characterized in that, The crane winding motor carbon brush wear alarm device includes switch contact device, fixing device and single-chip microcomputer, the switch contact device includes insulating ball (1), switch (7) and connecting structure (3), the switch (7) is connected to the single-chip microcomputer through the connecting structure (3), the insulating ball (1) and the switch (7) are connected through contact, the insulating ball (1), the connecting structure (3) and the switch (7) are die-cast in the machine body (2), and the switch contact device is die-cast in the plastic 4330, the connecting structure (3) is led out through the upper end of the machine body by two parallel lead lines, the insulating ball (1) and the switch (7) are located at a corner of the bottom of the machine body (2), and the position is provided with a square protrusion, and more than half of the volume of the insulating ball (1) is located in the square protrusion;The fixing device adopts inclined wedge (4) and shell, the outside of the brush box (5) is provided with a notch with the same size as the square protrusion of the bottom of the machine body, the shell is fixed on the outside of the brush box (5), the switch contact device is inserted into the shell, and the protrusion of the machine body (2) is inserted into the notch of the brush box (5), and the inclined wedge (4) is embedded tightly in the rear side of the switch contact device; The single-chip microcomputer receives the switch signal transmitted by the connecting mechanism (3), and judges the switch condition according to the switch signal.

2. The hoist motor brush wear alarm of claim 1, wherein, The insulating ball (1) and the switch (7) are contact-connected, and the insulating ball (1) and the switch (7) are pre-tightened by the elastic force generated by the spring in the switch.

3. The hoist motor brush wear alarm of claim 1 wherein, The opening position of the brush box (5) is the length alarm value of the carbon brush (6).

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