Motor braking device

Abstract

The application provides a motor braking device, which comprises a frame, a first solenoid for controlling the forward rotation of the motor and a second solenoid for controlling the reverse rotation of the motor are arranged in the frame respectively; the first solenoid and the second solenoid each comprise a coil, a moving iron core and a static iron core, the static iron core is sleeved on one end of the moving iron core, and the coil is arranged on the outer side of the moving iron core and the static iron core; one end of the moving iron core is arranged outside the static iron core and connected with a first driving element, the other end of the moving iron core is connected with a second driving element, the first driving element is connected with a driving switch, and the second driving element is connected with a limit switch through a third driving element. The two solenoids are arranged to control the forward and reverse rotation of the motor respectively, the coils of the two solenoids are electrified to control the forward and reverse rotation of the motor respectively, and the coils are automatically connected with a standby braking circuit after losing electricity; when a switch SL3 in the electric circuit is actuated, the motor is instantaneously braked, and the braking is rapid and reliable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor braking, in particular to a motor braking device. BACKGROUND

[0002] With the development of economy and the progress of science and technology, electric actuators are more and more widely used in industrial fields, and the control technology of electric actuators has also made certain progress and update. The motor operating mechanism is a power device for operating high-voltage disconnecting switches and high-voltage grounding switches. The motor drives the output shaft to rotate through a speed reducer, and then drives the mechanical transmission connecting rod connected with the output shaft to make the contacts on the switch body open and close. After the opening and closing are in place, the travel switch in the mechanism disconnects the control power supply, and the motor stops rotating, completing the opening and closing operation. Due to the existence of the rotation inertia of the motor, the motor will continue to rotate for a certain time after power failure. In order to ensure the accuracy of the output angle of the mechanism, a mechanical limiting device is designed on the transmission structure of the mechanism. However, if the inertia is too large, the transmission crank arm on the mechanism will violently hit the mechanical limiting device, damaging some part of the transmission. In order to reduce or even eliminate the inertia of the motor after power failure, it is necessary to take braking measures on the motor at the moment of power failure. However, there is no ideal technical solution with good braking effect and low use cost for the motor braking problem in the electric actuators using three-phase motors. SUMMARY

[0003] In view of the deficiencies in the above background art, the present application provides a motor braking device which has simple overall structure, reasonable design, can realize rapid braking, is reliable in braking, high in safety and stable in work.

[0004] To solve the above technical problems, the present application adopts the following technical scheme: a motor braking device, comprising a frame, a first solenoid for controlling the forward rotation of a motor and a second solenoid for controlling the reverse rotation of the motor are arranged in the frame respectively; the first solenoid and the second solenoid each comprise a coil, a moving iron core and a stationary iron core, the stationary iron core is sleeved on one end of the moving iron core, and the coil is wound around the outside of the moving iron core and the stationary iron core; one end of the moving iron core extends out of the stationary iron core and is connected with a first driving member, the other end of the moving iron core is connected with a second driving member, the first driving member is connected with a driving switch, and the second driving member is connected with a limit switch through a third driving member.

[0005] The frame comprises a first fixed plate, a second fixed plate and a third fixed plate, the number of the first fixed plate, the second fixed plate and the third fixed plate is each two and they are riveted into a rectangular frame structure and form a closed magnetic circuit.

[0006] The first driving member comprises a first push plate and a second push plate, the first push plate is connected with the moving iron core in the first solenoid, and the second push plate is connected with the moving iron core in the second solenoid.

[0007] The second driving member comprises a third push plate and a fourth push plate, the third push plate is connected with the moving iron core in the first solenoid, and the fourth push plate is connected with the moving iron core in the second solenoid.

[0008] The third driving member comprises a cam, the third push plate and the fourth push plate are both connected with the limit switch through the cam.

[0009] The driving switch comprises a first driving switch group connected with the first push plate and a second driving switch group connected with the second push plate; the first driving switch group and the second driving switch group both comprise four self-resetting micro switches, and the four self-resetting micro switches are all matched with the corresponding moving iron core.

[0010] The limit switch comprises two self-resetting micro switches, and the two self-resetting micro switches are both matched with the cam.

[0011] The two solenoids are arranged to control the motor forward and reverse rotation respectively, when the moving iron cores in the two solenoids move, the push plate at one end of the moving iron core can directly drive the four driving switches to move, the push plate at the other end of the moving iron core drives the two limit switches to move through the cam, the driving switches reset after the coil loses electricity, the limit switches remain in the moving state after the coil loses electricity, the two coils move to control the motor forward and reverse rotation, and the automatic preparation braking circuit is formed after the coil loses electricity, the motor is instantaneously braked when the switch SL3 in the electric circuit moves, the braking is rapid and reliable, the overall structure is simple, the design is reasonable, the safety is high, and the work is stable. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0013] Figure 1 It is a structural schematic diagram of the present application;

[0014] Figure 2 It is a top view of Figure 1 ;

[0015] Figure 3 It is a left side view of Figure 1 ;

[0016] Figure 4 is a right side view of Figure 1

[0017] Figure 5 is a schematic diagram of the position of the drive switch of the present application;

[0018] Figure 6 is an electrical diagram of the forward and reverse rotation and braking control of the motor of the present application;

[0019] Figure 7 is an electrical diagram of the forward rotation control of the motor of the present application;

[0020] Figure 8 is an electrical diagram of the forward rotation braking of the motor of the present application;

[0021] Figure 9 is an electrical diagram of the reverse rotation control of the motor of the present application;

[0022] Figure 10 is an electrical diagram of the reverse rotation braking of the motor of the present application. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0024] As Figure 1 and Figure 2 ​As shown in the drawings, the present application provides a motor braking device, which comprises a frame 1, the frame 1 comprises a first fixed plate 11, a second fixed plate 12 and a third fixed plate 13, the number of the first fixed plate 11, the second fixed plate 12 and the third fixed plate 13 is both provided with two and riveted into a rectangular frame structure and forms a closed magnetic circuit. The frame 1 is respectively provided with a first solenoid KA for controlling the forward rotation of the motor and a second solenoid KE for controlling the reverse rotation of the motor, and the first solenoid KA and the second solenoid KE both comprise a coil 4, a moving iron core 5 and a static iron core 6, the static iron core 6 is sleeved on one end of the moving iron core 5, and the coil 4 is wrapped outside the moving iron core 5 and the static iron core 6. One end of the moving iron core 5 in the first solenoid KA or the second solenoid KE extends out of the static iron core 6 and is connected with a first driving part 7, and the other end is connected with a second driving part 8, and the first driving part 7 is connected with a driving switch 9, and the second driving part 8 is connected with a limit switch 11 through a third driving part 10. This structure realizes that when the moving iron core 5 in the first solenoid KA or the second solenoid KE acts, the corresponding first driving part 7 can directly drive the driving switch 9 to act, and the corresponding second driving part 8 drives the limit switch 11 to act through the third driving part 10.

[0025] In this embodiment, as shown in Figure 3 、 4 The first driving part 7 comprises a first push plate 71 and a second push plate 72, the first push plate 71 is connected with one end of the moving iron core 5 in the first solenoid KA, and the second push plate 72 is connected with one end of the moving iron core 5 in the second solenoid KE. The second driving part 8 comprises a third push plate 81 and a fourth push plate 82, the third push plate 81 is connected with the other end of the moving iron core 5 in the first solenoid KA, and the fourth push plate 82 is connected with the other end of the moving iron core 5 in the second solenoid KE. The third driving part 10 comprises a cam, and the third push plate 81 and the fourth push plate 82 are both connected with the limit switch 11 through the cam. The driving switch 9 comprises a first driving switch group 91 connected with the first push plate 71 and a second driving switch group 92 connected with the second push plate 72, and the first driving switch group 91 and the second driving switch group 92 both comprise four self-resetting micro switches, and the positional relationship of the four self-resetting micro switches is as shown in Figure 5As shown, and the four self-resetting micro-switches are matched with the corresponding moving iron core 5. The limit switch 11 includes two self-resetting micro-switches SL4 and SL5, which are matched with the cam. In this embodiment, all the self-resetting micro-switches are actuated with the corresponding moving iron core, that is, when the first solenoid KA is electrified, the moving iron core in the KA is electrified to actuate, the first push plate drives the four self-resetting micro-switches of the first drive switch group to actuate, the third push plate drives the two self-resetting micro-switches of the limit switch through the cam to actuate, thereby driving the motor to rotate forward; when the second solenoid KE is electrified, the moving iron core in the KE is electrified to actuate, the second push plate drives the four self-resetting micro-switches of the second drive switch group to actuate, the fourth push plate drives the two self-resetting micro-switches of the limit switch through the cam to actuate, thereby driving the motor to rotate reversely.

[0026] The motor braking device in this embodiment is essentially used as a contactor, and a three-position disconnector is used as a control mechanism to control the working state, which is specially used for forward and reverse rotation control and braking of AC / DC dual-purpose series motor. The specific motor forward and reverse rotation and braking control circuit is as shown in Figure 6 When the motor rotates forward, the control circuit is as shown in Figure 7 The two ends of the coil M in the first solenoid KA are connected with the normally open contact KA1 and the normally open contact KA2 in series, and the normally open contact KA1 is connected with the positive pole ML of the power supply. + The coil of the first solenoid KA is electrified, the normally open contact KA2 is connected with the normally closed contact KE3 of the second solenoid KE in series, the normally closed contact KE3 is connected with the ZH2 end of the motor in series, the normally open contact KA6 connected with the negative pole ML of the power supply is closed and connected with the ZH1 end of the motor in series. - Thus, the motor forward rotation control circuit is formed. When the circuit is conducted, the motor rotates forward. When the coil in the first solenoid KA is electrified, the motor rotates forward, and after the coil is de-energized, the preliminary braking circuit is automatically formed. When the SL3 moves in the circuit, the motor is instantaneously braked. The braking circuit corresponding to the motor forward rotation is as shown in Figure 8 The switch SL3 is closed and connected with the D4 end of the coil, the D3 end of the coil is connected with the normally closed contact KA4 through the resistance R in series, the normally closed contact KA4 is connected with the normally closed contact KE4 in series, the normally closed contact KE4 is connected with the switch SL4, the NC contact of the switch SL4 is conducted and connected with the ZH2 end of the motor, the ZH1 end of the motor is connected with the switch SL5, the NC contact of the switch SL5 is conducted, and the switch SL5 is connected with the normally closed contact KE5, the normally closed contact KE5 is connected with the normally closed contact KA5 in series, and the normally closed contact KA5 is connected with the switch SL3, thereby forming the motor forward rotation braking circuit.

[0027] When the motor rotates reversely, the control circuit is as shown in Figure 9As shown, the two ends of the coil M in the second solenoid KE are connected in series with the normally open contact-KE1 and the normally open contact-KE2, both of which are closed, and the normally open contact-KE1 is connected to the positive pole ML of the power supply + so that the coil of the second solenoid KE is energized, the normally open contact-KE2 is connected in series with the normally closed contact-KA3 of the first solenoid KA, the normally closed contact-KA3 is connected in series with the ZH2 end of the motor, the normally open contact-KE6 connected in series with the ZH1 end of the motor is closed, and the normally open contact-KE6 is connected to the negative pole ML of the power supply - so as to form a motor reverse control circuit, when the circuit is turned on, the motor is reversed. When the coil in the second solenoid KE is energized, the motor is reversed, and after the coil is de-energized, a standby braking circuit is automatically formed. Similarly, when the SL3 in the electric circuit is actuated, the braking circuit corresponding to the motor reverse is as shown in Figure 10 As shown, the switch SL3 is closed and connected to the D4 end of the coil, the D3 end of the coil is connected in series with the normally closed contact-KA4 through the resistance R, the normally closed contact-KA4 is connected in series with the normally closed contact-KE4, the normally closed contact-KE4 is connected in series with the switch SL4, the NO contact of the switch SL4 is turned on and connected to the ZH1 end of the motor, the ZH2 end of the motor is connected to the switch SL5, the NO contact of the switch SL5 is turned on, and the switch SL5 is connected to the normally closed contact-KE5, the normally closed contact-KE5 is connected in series with the normally closed contact-KA5, and the normally closed contact-KA5 is connected to the switch SL3, so as to form a motor reverse braking circuit.

[0028] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A motor braking device, characterized in that: The invention comprises a frame, wherein a first solenoid electromagnet for controlling the forward rotation of the motor and a second solenoid electromagnet for controlling the reverse rotation of the motor are respectively arranged in the frame; The first solenoid electromagnet and the second solenoid electromagnet both comprise a coil (4), a moving iron core (5) and a static iron core (6); the static iron core (6) is sleeved on one end of the moving iron core (5), and the coil (4) surrounds the outer sides of the moving iron core (5) and the static iron core (6); one end of the moving iron core (5) extends out of the static iron core (6) and is connected to a first driving member (7); the other end of the moving iron core (5) is connected to a second driving member (8), and the first driving member (7) is connected to a driving switch (9); the second driving member (8) is connected to a limit switch (11) via a third driving member (10); The first driving member (7) includes a first push plate (71) and a second push plate (72), the first push plate (71) being connected to the moving iron core (5) in the first solenoid electromagnet, and the second push plate (72) being connected to the moving iron core (5) in the second solenoid electromagnet; The second driving member (8) includes a third push plate (81) and a fourth push plate (82), the third push plate (81) is connected to the moving iron core (5) in the first solenoid electromagnet, and the fourth push plate (82) is connected to the moving iron core (5) in the second solenoid electromagnet; The third driving member (10) includes a cam, and the third push plate (81) and the fourth push plate (82) are both connected to the limit switch (11) via the cam; The driving switch (9) comprises a first driving switch group (91) connected to the first push plate (71) and a second driving switch group (92) connected to the second push plate (72); The drive switch resets after the coil loses power, and the limit switch remains in the action state after the coil loses power. The two coils act separately to control the forward and reverse rotation of the motor. When the coil loses power, a preparatory braking circuit is automatically formed. When the switch in the electrical circuit is actuated, the motor brakes instantly.

2. The motor brake device according to claim 1, characterized in that: The frame comprises a first fixing plate (1), a second fixing plate (2) and a third fixing plate (3), wherein two of each of the first fixing plate (1), the second fixing plate (2) and the third fixing plate (3) are riveted to each other to form a rectangular frame structure and a closed magnetic circuit.

3. The motor brake device according to claim 2, characterized in that: The first drive switch group (91) and the second drive switch group (92) each include four self-resetting micro switches, and the four self-resetting micro switches are all matched with corresponding moving iron cores (5).

4. The motor brake device according to claim 3, characterized in that: The limit switch (11) includes two self-resetting micro switches, and both of the self-resetting micro switches cooperate with the cam.

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