A two-speed motor brake

Abstract

The present invention discloses a two-speed motor brake, which comprises a housing, a main shaft, an auxiliary shaft, a braking member, an electromagnet assembly and a small motor assembly; one end of the main shaft is rotatably disposed in the housing, and a wind vane is fixedly connected to the main shaft; the auxiliary shaft is rotatably disposed in the housing through a needle bearing and the auxiliary shaft can axially move relative to the needle bearing, a braking member is fixedly connected to one end of the auxiliary shaft adjacent to the main shaft, an elastic assembly is provided in the housing, and the auxiliary shaft has a tendency to move towards the main shaft side under the action of the elastic assembly; the electromagnet assembly is fixedly disposed in the housing, a suction cup is connected to the auxiliary shaft or the brake disc, and there is a stroke for the suction cup to axially move relative to the brake disc between the wind vane and the electromagnet assembly; the small motor assembly includes a small motor and a transmission mechanism, and the small motor assembly drives the auxiliary shaft to operate through the transmission mechanism. Through this setting, the two-speed motor brake has both the functions of braking the operation of the main shaft and driving the main shaft to operate at a low speed.

Description

Technical Field

[0001] The present invention relates to the technical field of textile machines, and particularly relates to a two-speed motor brake. Background Art

[0002] In conventional textile machinery driven by large motors, the main shaft connected to the textile device is generally braked by a braking component installed on the large motor. For example, in a webbing machine, when normal operation is interrupted (such as when the current is interrupted), the braking component is released, and the main shaft is braked by means of the cooperation between the brake disc of the braking component and the brake disc on the main shaft. In the normal power-on state, the braking component is attracted by the electromagnet, causing the brake disc to separate from the brake piece on the main shaft, thereby releasing the brake. Since the main shaft of the textile machinery needs to rotate at a low speed during debugging (assembly, overhaul, or maintenance), the main shaft driving the operation of the textile machinery should have two states: 1. The low-speed operation state during debugging; 2. The high-speed operation state during normal operation; however, the existing structure can only drive the main shaft to rotate at a high speed by the large motor, thus unable to meet the requirements of debugging. Therefore, the existing structure needs to be improved. Summary of the Invention

[0003] The purpose of the present invention is to provide a two-speed motor brake that combines the functions of braking the rotation of the main shaft and driving the main shaft to rotate at a low speed.

[0004] The above technical purpose of the present invention is achieved through the following technical solutions: A two-speed motor brake includes a housing, a main shaft, an auxiliary shaft, a braking member, an electromagnet assembly, and a small motor assembly;

[0005] One end of the main shaft is rotatably disposed in the housing, and a wind blade is fixedly connected to the main shaft;

[0006] The auxiliary shaft is rotatably disposed in the housing through a needle bearing and can axially move relative to the needle bearing. A braking member is fixedly connected to one end of the auxiliary shaft adjacent to the main shaft. An elastic assembly is provided in the housing, and the auxiliary shaft has a tendency to move towards the main shaft under the action of the elastic assembly;

[0007] The electromagnet assembly is fixedly disposed in the housing. A suction cup is connected to the auxiliary shaft or the brake disc. There is a stroke for the suction cup to axially move between the wind blade and the electromagnet assembly. When the electromagnet assembly is energized, the suction cup is attracted by the electromagnet assembly to make the braking member disengage from the wind blade. When the electromagnet assembly is de-energized, the auxiliary shaft moves towards the main shaft under the action of the elastic assembly to disengage the suction cup from the electromagnet assembly, and the braking member abuts against the wind blade;

[0008] The small motor assembly includes a small motor and a transmission mechanism, and the small motor assembly drives the auxiliary shaft to operate through the transmission mechanism.

[0009] Further, the braking member includes a brake disc fixedly connected to the auxiliary shaft and a brake pad disposed on the brake disc. The braking member abuts against the wind blade through the brake pad to brake the main shaft.

[0010] Further, the suction cup is threadedly connected to the brake disc, and a positioning assembly capable of restricting relative rotation between it and the brake disc is provided on the suction cup.

[0011] Further, the positioning assembly includes a screw rod connected to the suction cup and a positioning hole radially provided on the brake disc. The relative rotation between the suction cup and the brake disc is restricted by the positioning cooperation between the screw rod and the positioning hole.

[0012] Further, the main shaft and the auxiliary shaft are coaxially arranged and there is a spacing between the main shaft and the auxiliary shaft axially.

[0013] Further, the elastic component is arranged at the other end of the auxiliary shaft relative to the main shaft. The elastic component includes a gland and a spring. The gland is threadedly connected to the housing. One end of the spring acts on the gland and the other end of the spring acts on the auxiliary shaft.

[0014] Further, the electromagnet assembly includes an electromagnet core, a coil and a coil seat. The electromagnet core is fixed in the housing. The coil seat is fixedly connected to the inner ring of the electromagnet core. An installation cavity is formed between the electromagnet core and the coil seat, and the coil is arranged in the installation cavity.

[0015] Further, the distance between the electromagnet core and the suction cup is less than or equal to the distance between the coil and the suction cup, and at the same time, the distance between the electromagnet core and the suction cup is also less than or equal to the distance between the coil seat and the suction cup.

[0016] Further, the transmission mechanism includes a first bevel gear fixedly connected to the auxiliary shaft and a second bevel gear fixedly connected to the small motor assembly. The first bevel gear and the second bevel gear are in meshing transmission.

[0017] Further, the housing includes a housing body and a front end cover and a rear end cover provided at both ends of the housing body. A channel for the second bevel gear to extend into the housing is provided between the housing body and the front end cover.

[0018] In summary, the present invention has the following beneficial effects:

[0019] A two-speed motor brake has the functions of braking the operation of the main shaft and driving the main shaft to rotate at a low speed. Specifically, under normal conditions, the electromagnet assembly is in an energized state, and the suction cup is attracted by the electromagnet assembly to drive the auxiliary shaft to move towards the side of the compression spring and separate the braking member from the wind blade. When the electromagnet assembly is de-energized, the suction force of the electromagnet assembly disappears, and the auxiliary shaft drives the brake disc, the suction cup and the brake pad to reset synchronously under the action of the elastic assembly, so that the braking member abuts against the wind blade to brake the main shaft, and then the main shaft is quickly stopped. When the textile machinery is being debugged, the large motor and the electromagnet assembly are kept in a de-energized state, and the small motor assembly drives the auxiliary shaft to rotate through the transmission mechanism. The auxiliary shaft drives the main shaft to rotate at a low speed through the frictional cooperation between the braking member and the wind blade. During the debugging process, the screw is in a state of being disengaged from the positioning hole. After the debugging is completed, the screw is inserted into the positioning hole to limit the relative rotation between the suction cup and the braking member. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a cross-sectional view of the present invention.

[0021] Figure 2 is a schematic structural view of the small motor assembly of the present invention.

[0022] In the figure: 1. Housing; 11. Housing body; 12. Front end cover; 13. Rear end cover; 2. Main shaft; 3. Auxiliary shaft; 31. Needle bearing; 32. First bevel gear; 4. Braking member; 41. Brake disc; 411. Positioning hole; 42. Brake pad; 5. Electromagnet assembly; 51. Electromagnet core; 52. Coil; 53. Coil seat; 6. Small motor assembly; 61. Second bevel gear; 7. Wind blade; 8. Suction cup; 81. Fixed block; 82. Screw; 9. Elastic assembly; 91. Pressing cover; 92. Spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] As Figure 1-2As shown in the figure, a two-speed electric motor brake includes a housing 1, a main shaft 2, an auxiliary shaft 3, a brake member 4, an electromagnet assembly 5, and a small motor assembly 6. The housing 1 includes a housing body 11, a front end cover 12 and a rear end cover 13 provided at both ends of the housing body 11. One end of the main shaft 2 is rotatably disposed in the housing 1 through a bearing, and the other end of the main shaft 2 extends out of the housing 1 and is connected to a large motor. The main shaft 2 is driven by the large motor to rotate at a high speed to drive the textile machinery to work. A wind vane 7 is fixedly connected to the position of the main shaft 2 inside the housing 1. The wind vane 7 has the following functions: 1. It can cooperate with the brake member 4 to brake the main shaft 2 so that the main shaft 2 stops rotating quickly; 2. When the large motor is in normal working state, the fan has a heat dissipation function to dissipate heat from the components inside the housing 1; 3. During the debugging process, the large motor and the electromagnet assembly 5 are in a power-off state, and the small motor assembly 6 drives the auxiliary shaft 3 to rotate. The auxiliary shaft 3 is in frictional cooperation with the brake member 4 through the wind vane 7 to drive the main shaft 2 to rotate at a low speed, and then the debugging work is carried out.

[0025] The auxiliary shaft 3 is rotatably disposed in the housing 1 through a needle bearing 31 and the auxiliary shaft 3 can axially move relative to the needle bearing 31. In the present invention, the main shaft 2 and the auxiliary shaft 3 are coaxially arranged and there is a distance between the main shaft 2 and the auxiliary shaft axially. A brake member 4 is fixedly connected to one end of the auxiliary shaft 3 adjacent to the main shaft 2. The brake member 4 includes a brake disc 41 fixedly connected to the auxiliary shaft 3 and a brake pad 42 provided on the brake disc 41. The brake member 4 abuts against the wind vane 7 through the brake pad 42 to brake the main shaft 2. An elastic component 9 is provided inside the housing 1. The auxiliary shaft 3 has a tendency to move towards the main shaft 2 under the action of the elastic component 9. In the present invention, the brake disc 41 and the auxiliary shaft 3 are connected by a key, and at the same time, the brake disc 41 is firmly fixed to the auxiliary shaft 3 by a gasket and a bolt.

[0026] At least two needle bearings 31 are provided on the outer periphery of the auxiliary shaft 3. In the present invention, the axis of one needle bearing 31 is defined at the inner end of the coil seat 53, and the other needle bearing 31 is axially defined at the inner end of the front end cover 12. Through the arrangement of the needle bearings 31, the auxiliary shaft 3 is rotatably disposed in the housing 1 and can axially move along the internal guide groove of the needle bearing 31.

[0027] The electromagnet assembly 5 is fixedly disposed in the housing 1. A suction cup 8 is connected to the auxiliary shaft 3 or the brake disc 41. There is a stroke for the suction cup 8 to axially move between the wind vane 7 and the electromagnet assembly 5. When the electromagnet assembly 5 is energized, the suction cup 8 is attracted by the electromagnet assembly 5 to separate the brake member 4 from the wind vane 7. When the electromagnet assembly 5 is de-energized, the auxiliary shaft 3 moves towards the main shaft 2 under the action of the elastic component 9 to disconnect the suction cup 8 from the electromagnet assembly 5, and the brake member 4 abuts against the wind vane 7. The small motor assembly 6 includes a small motor and a transmission mechanism. The small motor assembly 6 drives the auxiliary shaft 3 to operate through the transmission mechanism.

[0028] In the present invention, the electromagnet assembly 5 includes an electromagnet core 51, a coil 52 and a coil seat 53. The electromagnet core 51 is fixed within the housing 1. The coil seat 53 is fixedly connected to the inner ring of the electromagnet core 51. An installation cavity is formed between the electromagnet core 51 and the coil seat 53, and the coil 52 is disposed within the installation cavity. Further, the distance between the electromagnet core 51 and the suction cup 8 is less than or equal to the distance between the coil 52 and the suction cup 8, and at the same time, the distance between the electromagnet core 51 and the suction cup 8 is also less than or equal to the distance between the coil seat 53 and the suction cup 8.

[0029] The suction cup 8 is threadedly connected to the brake disc 41, and a positioning assembly for restricting relative rotation between the suction cup 8 and the brake disc 41 is provided on the suction cup 8. The positioning assembly includes a screw 82 connected to the suction cup 8 and a positioning hole 411 radially provided on the brake disc 41. The relative rotation between the suction cup 8 and the brake disc 41 is restricted through the positioning cooperation between the screw 82 and the positioning hole 411. Specifically, a fixing block 81 is provided on the end face of the suction cup 8 close to the brake disc 41. The screw 82 is inserted into the fixing block 81, and the distance that its lower end extends out of the fixing block 81 is adjustable. Specifically, the screw 82 can be inserted into or pulled out of the positioning hole 411 of the brake disc 41 as needed.

[0030] The elastic assembly 9 is disposed at the other end of the auxiliary shaft 3 relative to the main shaft 2. The elastic assembly 9 includes a gland 91 and a spring 92. The gland 91 is threadedly connected to the housing 1. One end of the spring 92 acts on the gland 91, and the other end of the spring 92 acts on the auxiliary shaft 3. By adjusting the depth of the gland 91 screwed into the housing 1, the elastic force of the spring 92 is adjusted, and further the pressure when the brake disc presses against the wind blade 7 is adjusted.

[0031] The transmission mechanism includes a first bevel gear 32 fixedly connected to the auxiliary shaft 3 and a second bevel gear 61 fixedly connected to the small motor assembly 6. The first bevel gear 32 and the second bevel gear 61 are in meshing transmission. A channel for the second bevel gear 61 to extend into the housing 1 is provided between the housing body 11 and the front end cover 12. At the same time, the movement amount of the auxiliary shaft 3 is controlled to be ≤ 1.5 mm, and this small movement amount will not affect the bevel gears.

[0032] The two-speed motor brake has the functions of braking the operation of the main shaft 2 and driving the main shaft 2 to rotate at a low speed. Specifically, under normal conditions, the electromagnet assembly 5 is in an energized state, and the suction cup 8 is attracted by the electromagnet assembly 5 to drive the auxiliary shaft 3 to move toward one side of the compression spring 92 and separate the braking member 4 from the wind blade 7. When the electromagnet assembly 5 is de-energized, the suction force of the electromagnet assembly 5 disappears, and the auxiliary shaft 3 drives the brake disc 41, the suction cup 8, and the brake pad 42 to reset synchronously under the action of the elastic assembly 9, so that the braking member 4 abuts against the wind blade 7 to brake the main shaft 2, and then the main shaft 2 is quickly stopped; during the debugging of the textile machinery, the large motor and the electromagnet assembly 5 are kept in a de-energized state, and the small motor assembly 6 drives the auxiliary shaft 3 to rotate through the transmission mechanism. The auxiliary shaft 3 drives the main shaft 2 to rotate at a low speed through the frictional cooperation between the braking member 4 and the wind blade 7. During the debugging process, the screw 82 is in a state of being disengaged from the positioning hole 411. After the debugging is completed, the screw 82 is inserted into the positioning hole 411 to limit the relative rotation between the suction cup 8 and the braking member 4.

[0033] In order to keep the electromagnet assembly 5 energized for a long time without being burned out, DC power supply is selected for the safety of the coil 52. At the same time, the reasonable number of turns of the coil 52, the wire gauge diameter, and the size of the excitation winding are designed according to the size of the gap. The coil 52 is impregnated with F-class solventless varnish in vacuum, which is beneficial to heat conduction, improves the insulation performance, heat resistance and moisture resistance of the coil 52, and also enhances the mechanical properties such as shock and vibration resistance.

[0034] The above is only the preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features, and principles described in the scope of the present invention patent application are included in the scope of the present invention patent application.

Claims

1. A two-speed motor brake, characterized in that: It includes a housing (1), a main shaft (2), an auxiliary shaft (3), a braking member (4), an electromagnet assembly (5), and a small motor assembly (6); One end of the main shaft (2) is rotatably disposed within the housing (1), and a wind blade (7) is fixedly connected to the main shaft (2); The auxiliary shaft (3) is rotatably disposed within the housing (1) through a needle roller bearing (31) and the auxiliary shaft (3) can axially move relative to the needle roller bearing (31). A braking member (4) is fixedly connected to one end of the auxiliary shaft (3) adjacent to the main shaft (2). An elastic component (9) is provided within the housing (1), and the auxiliary shaft (3) has a tendency to move towards the main shaft (2) under the action of the elastic component (9); The electromagnet assembly (5) is fixedly disposed within the housing (1). A suction cup (8) is connected to the auxiliary shaft (3) or the braking member (4). There is a stroke for the suction cup (8) to axially move between the wind blade (7) and the electromagnet assembly (5). When the electromagnet assembly (5) is energized, the suction cup (8) is attracted by the electromagnet assembly (5) so that the braking member (4) disengages from the wind blade (7). When the electromagnet assembly (5) is de-energized, the auxiliary shaft (3) moves towards the main shaft (2) under the action of the elastic component (9) so that the suction cup (8) disengages from the electromagnet assembly (5), and the braking member (4) abuts against the wind blade (7); The small motor assembly (6) includes a small motor and a transmission mechanism, and the small motor assembly (6) drives the auxiliary shaft (3) to operate through the transmission mechanism.

2. The double-speed motor brake according to claim 1, characterized in that: The braking member (4) includes a brake disc (41) fixedly connected to the auxiliary shaft (3) and a brake pad (42) provided on the brake disc (41). The braking member (4) abuts against the wind blade (7) through the brake pad (42) to brake the main shaft (2).

3. A two-speed motor brake according to claim 2, characterized in that: The suction cup (8) is threadedly connected to the brake disc (41), and a positioning component is provided on the suction cup (8) to limit its relative rotation with the brake disc (41).

4. A two-speed motor brake according to claim 3, characterized in that: The positioning component includes a screw (82) connected to the suction cup (8) and a positioning hole (411) radially provided on the brake disc (41). The relative rotation of the suction cup (8) and the brake disc (41) is limited through the positioning cooperation between the screw (82) and the positioning hole (411).

5. A two-speed motor brake according to claim 1, characterized in that: The main shaft (2) and the auxiliary shaft (3) are coaxially arranged and there is a spacing between the main shaft (2) and the auxiliary shaft axially.

6. The double-speed motor brake according to claim 1, characterized in that: The elastic component (9) is provided at the other end of the auxiliary shaft (3) relative to the main shaft (2). The elastic component (9) includes a gland (91) and a spring (92). The gland (91) is threadedly connected to the housing (1). One end of the spring (92) acts on the gland (91), and the other end of the spring (92) acts on the auxiliary shaft (3).

7. A two-speed electric motor brake according to claim 1, characterized in that: The electromagnet assembly (5) includes an electromagnet core (51), a coil (52), and a coil seat (53). The electromagnet core (51) is fixed within the housing (1). The coil seat (53) is fixedly connected to the inner ring of the electromagnet core (51). An installation cavity is formed between the electromagnet core (51) and the coil seat (53), and the coil (52) is disposed within the installation cavity.

8. A two-speed motor brake according to claim 7, characterized in that: The distance between the electromagnet core (51) and the suction cup (8) is less than or equal to the distance between the coil (52) and the suction cup (8), and at the same time, the distance between the electromagnet core (51) and the suction cup (8) is also less than or equal to the distance between the coil seat (53) and the suction cup (8).

9. A two-speed motor brake according to claim 1, wherein: The transmission mechanism includes a first bevel gear (32) fixedly connected to the auxiliary shaft (3) and a second bevel gear (61) fixedly connected to the small motor assembly (6), and the first bevel gear (32) is in meshing transmission with the second bevel gear (61).

10. The double-speed motor brake according to claim 9, characterized in that: The housing (1) includes a housing body (11) and a front end cover (12) and a rear end cover (13) arranged at both ends of the housing body (11), and a channel for the second bevel gear (61) to extend into the housing (1) is provided between the housing body (11) and the front end cover (12).

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