CN219413426U - Belt pulley conversion mechanism - Google Patents

Abstract

The utility model provides a belt pulley conversion mechanism with convenient power switching and low working noise, and relates to the technical field of power transmission. The belt pulley conversion mechanism comprises a transmission shaft, an upper belt pulley A and a belt pulley B which are respectively rotatably arranged at two ends of the transmission shaft, wherein teeth A are arranged on the upper belt pulley A, and teeth B are arranged on the belt pulley B; the device further comprises a first transmission assembly for the first direction transmission belt pulley A and a second transmission assembly for the second direction transmission belt pulley B, wherein the first direction is opposite to the second direction; the first transmission assembly comprises a first fixed plate and telescopic teeth A which can be matched with the teeth A to drive the belt pulley A when the first transmission assembly extends out, and the second transmission assembly comprises a second fixed plate and telescopic teeth B which can be matched with the teeth B to drive the belt pulley B when the second transmission assembly extends out. The utility model has the advantages of convenient power switching, longer service life, simple structure, low manufacturing cost and convenient maintenance.

Description

Belt pulley conversion mechanism

Technical Field

The utility model relates to the technical field of power transmission, in particular to a belt pulley conversion mechanism.

Background

In the mechanical arrangement, a belt transmission mode is mostly adopted for driving, and power is required to be alternately output when a plurality of combined machines work, so that two working machines can alternately work. In order to switch power between the two working machines, it is now generally implemented by exchanging a drive belt between pulleys, which is inconvenient to operate.

The utility model application with the application number of CN200920173581.3 discloses a belt pulley conversion device which mainly comprises a spline shaft, a spline shaft sleeve sleeved in the middle of the spline shaft, a belt pulley A and a belt pulley B, wherein the belt pulley A is rotatably installed on the spline shaft on one side of the spline shaft sleeve through a bearing, the belt pulley B opposite to the belt pulley A is rotatably installed on the spline shaft on the other side of the spline shaft sleeve through a bearing, a circle of convex teeth C1 is arranged on the inner side surface of the spline shaft sleeve, and a circle of convex teeth C2 is also arranged on the outer side surface of the spline shaft sleeve opposite to the inner side surface of the spline shaft sleeve. When the power of the conversion device is switched, the convex teeth C1 of the conversion device are meshed with the belt pulley A by stirring the spline shaft sleeve, or the convex teeth C2 of the conversion device are meshed with the belt pulley B to drive the belt pulley A or the belt pulley B, and the spline shaft sleeve is needed to be manually stirred or an additional stirring mechanism is needed to be arranged.

The utility model application number CN200420105838.9 discloses an automatic reversing device of a rice milling and crushing combined machine, which comprises a rice milling machine ratchet wheel and a crusher ratchet wheel, wherein unidirectional operation teeth are arranged at the lower parts of the rice milling machine ratchet wheel and the crusher ratchet wheel, the directions of the operation teeth are opposite, the rice milling machine ratchet wheel and the crusher ratchet wheel are positioned on a shaft sleeve, a pawl is connected with the shaft sleeve downwards, the shaft sleeve and a pawl seat ring are pressed into a whole, a pawl is arranged on the pawl seat ring, and the pawl is connected with a pawl spring. When the reversing device depends on forward and reverse rotation of the motor, the pawl spring enables the pawl to be matched with the ratchet grooved pulley of the rice mill or the ratchet grooved pulley of the crusher in the corresponding direction, so that the ratchet grooved pulley of the rice mill or the ratchet grooved pulley of the crusher is driven in real time. The reversing device does not need to be stirred when in power switching, the power switching is more convenient, but under the action of the pawl spring, the pawl and the ratchet sheave can keep in contact all the time, the pawl and the ratchet sheave can be worn in the working process, and larger noise can be generated.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a belt pulley conversion mechanism which is convenient in power switching and low in working noise.

The technical scheme adopted for solving the technical problems is as follows: the belt pulley conversion mechanism comprises a transmission shaft, and a belt pulley A and a belt pulley B which are respectively rotatably arranged at two ends of the transmission shaft, wherein teeth A are arranged on the upper belt pulley A, and teeth B are arranged on the belt pulley B; the device further comprises a first transmission assembly for the first direction transmission pulley A and a second transmission assembly for the second direction transmission pulley B, wherein the first direction is opposite to the second direction;

the first transmission assembly comprises a first fixed plate and telescopic teeth A which can be matched with the teeth A to drive the belt pulley A when extending out, the first fixed plate is fixedly arranged on the transmission shaft, the telescopic teeth A are eccentrically hinged with the fixed plate through a first hinge shaft arranged along the radial direction of the transmission shaft, the gravity center is positioned on one side of the first hinge shaft close to the belt pulley A, the first hinge shaft can rotate in the first direction to extend out to be matched with the teeth A in the direction close to the belt pulley A, the second hinge shaft rotates in the second direction to retract in the direction away from the belt pulley A, and one side of the telescopic teeth A is provided with a first limiting table which is matched with the telescopic teeth A and used for enabling the telescopic teeth A to keep an extending state when the transmission shaft rotates in the first direction;

the second transmission assembly comprises a second fixed plate and telescopic teeth B which can be matched with the teeth B to drive the belt pulley B when the second transmission assembly extends out, the second fixed plate is fixedly arranged on the transmission shaft, the telescopic teeth B are eccentrically hinged with the second fixed plate through a second hinge shaft which is arranged along the radial direction of the transmission shaft, the center of gravity is located at one side of the second hinge shaft, which is close to the belt pulley B, so that the second transmission assembly can rotate in the direction, which is close to the belt pulley B, when the transmission shaft rotates in the second direction, to extend out and be matched with the teeth B, when the transmission shaft rotates in the first direction, the telescopic teeth B rotate and retract in the direction, and one side of the telescopic teeth B is provided with a second limiting table which is matched with the telescopic teeth B so as to enable the telescopic teeth B to keep an extending state when the transmission shaft rotates in the second direction.

Further, the first fixing plate and the second fixing plate are the same fixing plate and are located between the belt pulley A and the belt pulley B.

Further, a third limiting part which is matched with one side of the telescopic tooth A and used for limiting the position of the telescopic tooth A is arranged on the first fixing plate, so that the gravity center of the telescopic tooth A is positioned at one side of the first hinge shaft close to the belt pulley A when the telescopic tooth A is retracted; the second fixing plate is also provided with a fourth limiting part which is matched with one side of the telescopic tooth B and used for limiting the position of the telescopic tooth B, so that the gravity center of the telescopic tooth B when retracting is positioned at one side of the second hinge shaft close to the belt pulley B.

Further, the number of the telescopic teeth A is multiple, the telescopic teeth A are uniformly distributed on the periphery of the first fixing plate, and the number of the telescopic teeth B is also multiple, and the telescopic teeth B are uniformly distributed on the periphery of the second fixing plate.

Further, the side surface of the tooth A, which is close to the telescopic tooth A, is an inclined surface inclined to the extending direction of the telescopic tooth A, and the side surface of the tooth B, which is close to the telescopic tooth B, is an inclined surface inclined to the extending direction of the telescopic tooth B.

Further, the first fixing plate and the second fixing plate are welded and fixed on the transmission shaft.

Further, the belt pulley A and the belt pulley B are respectively rotatably arranged at two ends of the transmission shaft through bearings.

The beneficial effects of the utility model are as follows: the belt pulley conversion mechanism can enable the extending tooth A or the extending tooth B to extend or retract under the action of inertia through the positive and negative rotation of the transmission shaft, so that power is transmitted to the belt pulley A or the belt pulley B. In addition, the switching mechanism has the advantages of simple structure, low manufacturing cost and convenient maintenance.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic diagram of the conversion assembly of the present utility model;

FIG. 3 is a left side view of FIG. 2;

FIG. 4 is an enlarged view at A of FIG. 2;

the figure shows: 1. a belt pulley A1; 2. a belt pulley B; 3. a first transmission assembly; 4. a transmission shaft; 5. a second transmission assembly; 6. a counterclockwise direction; 11. tooth A; 12. a space for giving way; 21. tooth B; 31. a first fixing plate; 32. the tooth A stretches out; 52. the tooth B extends out; 33. a first hinge shaft; 53. a second hinge shaft; 34. a first limit table; 54. the second limiting table; 35. a third limit part; 36. a radial limit part; 55. and a fourth limit part.

Detailed Description

The utility model will be further described with reference to the drawings and examples.

As shown in fig. 1 and 2, the pulley conversion mechanism of the utility model comprises a transmission shaft 4, and a pulley A1 and a pulley B2 which are respectively rotatably arranged at two ends of the transmission shaft 4, so that the pulley A1 and the pulley B2 can respectively rotate relative to the transmission shaft 4, the upper pulley A1 is provided with teeth a11, and the pulley B2 is provided with teeth B21. The belt pulley A1 and the belt pulley B2 can be respectively and rotatably arranged at two ends of the transmission shaft 4 through bearings as in the prior art, and can also be directly in rotary fit with the transmission shaft 4. As shown in fig. 2, the conversion mechanism further comprises a first transmission assembly 3 for a first direction transmission pulley A1 and a second transmission assembly 5 for a second direction transmission pulley B2, said first direction being opposite to the second direction. The first transmission assembly 3 comprises a first fixing plate 31 and telescopic teeth A32 which can be matched with the teeth A11 to drive the belt pulley A1 when being extended, and the first fixing plate 31 is fixedly arranged on the transmission shaft 4. The telescopic teeth A32 are eccentrically hinged with the fixed plate 31 through a first hinge shaft 33 arranged along the radial direction of the transmission shaft 4, the gravity center is positioned on one side of the first hinge shaft 33 close to the belt pulley A1, so that the telescopic teeth A32 can be rotationally stretched out to be matched with the teeth A in the direction close to the belt pulley A1 when the transmission shaft 4 rotates along the first direction, the telescopic teeth A32 are rotationally retracted in the direction far away from the belt pulley A1 when the transmission shaft 4 rotates along the second direction, and a first limiting table 34 matched with the telescopic teeth A32 is arranged on one side of the telescopic teeth A32 and used for enabling the telescopic teeth A32 to be kept in a stretched state matched with the teeth A11 when the transmission shaft 4 rotates along the first direction. The second transmission assembly 5 comprises a second fixed plate 51 and telescopic teeth B52 which can be matched with the teeth B21 to drive the belt pulley B2 when extending, the second fixed plate 51 is fixedly arranged on the transmission shaft 4, the telescopic teeth B52 are eccentrically hinged with the second fixed plate 51 through a second hinge shaft 53 arranged along the radial direction of the transmission shaft 4, the center of gravity is located on one side of the second hinge shaft 53 close to the belt pulley B2, so that the telescopic teeth B can be rotationally extended to be matched with the teeth B in the direction close to the belt pulley B2 when the transmission shaft 4 rotates along the second direction, the telescopic teeth B52 are rotationally retracted in the direction away from the belt pulley B2 when the transmission shaft 4 rotates along the first direction, and a second limiting table 54 matched with the telescopic teeth B52 is arranged on one side of the telescopic teeth B52 and used for enabling the telescopic teeth B52 to be kept in an extending state matched with the teeth B21 when the transmission shaft 4 rotates along the second direction. The limiting table body can be fixedly connected with the fixing plate in a welding, bolting or integrated structure mode, and the fixing plate can be fixedly arranged on the transmission shaft 4 in a welding, bolting, clamping and other modes.

The first fixing plate 31 and the second fixing plate 51 may be the same fixing plate or different fixing plates. The first fixing plate 31 may be provided at a side of the pulley A1 away from the pulley B2, and the second fixing plate 51 may be provided at a side of the pulley B2 away from the pulley A1. In fig. 1, the first fixing plate 31 is disposed on a side of the pulley A1 near the pulley B2, and the second fixing plate 51 is disposed on a side of the pulley B2 near the pulley A1, and is the same plate, namely: the first fixing plate 31 and the second fixing plate 51 are the same fixing plate and are located between the pulley A1 and the pulley B2. In this way, the mechanism is more compact.

The first direction may be either clockwise or counterclockwise, taking the first direction as an example, the pulley switching mechanism of the present utility model is such that the protruding tooth a32 is eccentrically hinged to the first fixed plate 31 through the first hinge shaft 33 disposed along the radial direction of the transmission shaft 4, and the center of gravity is located at one side of the first hinge shaft 33 near the pulley A1, the telescopic tooth B52 is eccentrically hinged to the second fixed plate 51 through the second hinge shaft 53 disposed along the radial direction of the transmission shaft 4, and the center of gravity is located at one side of the second hinge shaft 53 near the pulley B2, such that the center of gravity of the protruding tooth a32 is not on the axis of the first hinge shaft 33, and the center of gravity of the telescopic tooth B52 is not on the axis of the second hinge shaft 53. In this way, the positions of the extending tooth a32 and the telescopic tooth B52 are reasonably set according to the principle of inertia, so that the extending tooth a32 can rotate and extend around the first hinge shaft 33 in the direction close to the belt pulley A1 under the action of inertia to be in contact with the side surface of the tooth a11 when the transmission shaft 4 rotates in the anticlockwise direction 6 in the acceleration process of starting the power motor, and can rotate and retract in the direction far from the belt pulley A1 when the transmission shaft 4 rotates in the clockwise direction to be out of contact with the tooth a11, namely the belt pulley A1 cannot be driven; and, the telescopic teeth B52 are rotated and retracted in a direction away from the pulley B2 about the second hinge axis by inertia to disengage from the teeth B21 when the drive shaft 4 rotates in the counterclockwise direction, i.e., the pulley B2 cannot be driven, and are rotated and extended in a direction approaching the pulley B2 to contact and engage with the side surfaces of the teeth B21 when the drive shaft 4 rotates in the clockwise direction. In order to prevent the above-mentioned tooth a32 from rotating continuously and retracting after rotating and stretching out, so as to disengage from the tooth a, a first limiting table 34 is disposed at a reasonable position on one side of the tooth a32, and the tooth a32 is prevented from rotating continuously by abutting and matching the first limiting table 34 with the side surface of the tooth a32, so that the tooth a32 is kept in a stretched state in a direction close to the pulley A1 when the transmission shaft 4 rotates anticlockwise, and the pulley A1 is driven in a anticlockwise rotation direction. In the same principle, the second limiting table 54 is disposed at a reasonable position on one side of the telescopic tooth B52, and the second limiting table 54 is in abutting engagement with the side surface of the telescopic tooth B52, so that the telescopic tooth B52 is prevented from continuing to rotate and being disengaged from the tooth B after rotating and extending, and the telescopic tooth B52 can be kept in an extending state in a direction close to the pulley B2 when the transmission shaft 4 rotates clockwise, and the pulley B2 can be driven in a clockwise rotation direction. In the case of the extended tooth a32 after the extended tooth is rotated and retracted, because the power motor is accelerated quickly, the centrifugal force of the extended tooth a32 is necessarily converted into a force that resists the reverse rotation of the extended tooth a32 to extend under the action of the centrifugal force as the rotation speed of the power motor increases to a certain level, for example: if the protruding tooth a32 is rotationally connected with the first hinge shaft 33, the first hinge shaft 33 is fixedly connected with the first fixing plate 31 to realize the hinge connection with the first fixing plate 31, a radial limiting portion 36 (see fig. 3) is necessarily provided between the first hinge shaft 33 and the protruding tooth a32 to limit the protruding tooth a32 to move along the radial direction of the transmission shaft, so that during the rotation process, along with the increase of the rotation speed of the protruding tooth a32 until the subsequent uniform transmission, the centrifugal force of the protruding tooth a32 is converted into a force that the limiting portion 36 blocks the rotation of the first hinge shaft 33, so that the protruding tooth a32 does not rotate and protrude under the action of gravity when the protruding tooth a32 rises, i.e. can keep a retracted state all the time during the operation. When the belt pulley conversion mechanism is used for power switching, if the belt pulley A1 is required to be driven, the power motor drives the transmission shaft to rotate anticlockwise, otherwise, if the belt pulley B2 is required to be driven, the power input direction is switched, and the power motor drives the transmission shaft to rotate along the needle. If the first direction is clockwise, the principle is the same as the above principle, and will not be described in detail. The belt pulley conversion mechanism can realize the transmission of power to the belt pulley A1 or the belt pulley B2 only by simply switching the power input direction of the power motor, and can ensure that the extending teeth of the non-driven belt pulley are not contacted with the corresponding belt pulley in the working process, and the belt pulley conversion mechanism has the advantages of low noise, low abrasion and longer service life in the working process. In addition, the switching mechanism has no spring, simple structure, low manufacturing cost and convenient maintenance.

It will be appreciated that the first stop 34 is specifically disposed on either side of the projecting tooth a32, and is associated with which end of the projecting tooth a32 the first stop 34 engages with the first hinge shaft 33 as a demarcation point. In fig. 2, the first stopper 34 is provided at one end of the projecting tooth a32 engaged with the tooth a11, and when the propeller shaft 4 rotates counterclockwise, the first stopper 34 should be provided at the front side of the rotational path of the projecting tooth a 32. The principle of the second limiting table 54 is also not specifically described.

It will be appreciated that in order to ensure that the projecting tooth a32 is able to retract rotationally about the first hinge shaft 33 or extend rotationally in abutting engagement with the side of the tooth a32, sufficient relief space 12 for rotation of the projecting tooth a32 should be provided on the rear side of the tooth a11 in the first direction. Similarly, one side of the tooth B21 should also be provided with enough space for the telescopic tooth B52 to rotate.

In the circumferential direction of the drive shaft 4, if the center of gravity of the projecting tooth a32 is on the same line as the center of gravity of the first hinge shaft 33 when it is retracted, or if the first hinge shaft 33 is on the side close to the pulley B, the projecting tooth a32 may not be rotatably projected about the first hinge shaft 33 at the next switching, which affects the reliability of the mechanism. For this purpose, as shown in fig. 3, the first fixing plate 31 is further provided with a third limiting portion 35 that is in abutting engagement with one side of the protruding tooth a32 for limiting the position of the protruding tooth a32, so that the center of gravity of the protruding tooth a32 when rotating and retracting about the first hinge shaft 33 is located at one side of the first hinge shaft 33 close to the pulley A1. Similarly, as shown in fig. 4, the second fixing plate 51 is further provided with a fourth limiting portion 55 that is in abutting engagement with one side of the telescopic tooth B52 for limiting the position of the telescopic tooth B52, so that the center of gravity of the telescopic tooth B52 when retracted is located at one side of the second hinge shaft 53 close to the pulley B2. The specific arrangement of the third and fourth limiting portions 35 and 55 is related to which side of the corresponding protruding tooth and which end of the corresponding protruding tooth the corresponding limiting table is engaged with using the corresponding hinge shaft as a demarcation point.

In some embodiments, the number of the extension teeth a32 and the extension teeth B52 may be one. In some embodiments, the number of the protruding teeth a32 is plural, and the protruding teeth are uniformly distributed on the outer periphery of the first fixing plate 31, and the number of the telescopic teeth B52 is also plural, and the protruding teeth B are uniformly distributed on the outer periphery of the second fixing plate 51, so as to improve the transmission reliability. The number of teeth a11 may be one-to-one or greater than the number of protruding teeth a 32. The same is true of the relationship of the teeth B to the projecting teeth B. Specifically, in the embodiment of the present utility model, the number of the telescopic teeth B52 and the extended teeth a32 is two, and the number of the teeth a and the teeth B is 4.

In order to reduce the influence of the tooth a11 on the extension of the extension tooth a32, particularly, when the number of the teeth a11 is plural, the side surface of the tooth a11 adjacent to the extension tooth a32 is a slope inclined toward the extension direction of the extension tooth a 32. In this way, the width of the relief space 12 is considerably increased and the impact on the strength of the tooth a11 is reduced. Similarly, the side surface of the tooth B21, which is close to the telescopic tooth B52, is an inclined surface inclined to the extending direction of the telescopic tooth B52.

The drive shaft 4 may be a solid shaft or a hollow shaft. The transmission shaft 4 may be an output shaft of the power motor, or may be a separate shaft, typically a separate shaft, and when the transmission shaft 4 is a hollow shaft, for convenience of installation on the output shaft of the power motor.

Claims (7)

1. The belt pulley conversion mechanism comprises a transmission shaft (4), and a belt pulley A (1) and a belt pulley B (2) which are respectively rotatably arranged at two ends of the transmission shaft (4), wherein teeth A (11) are arranged on the belt pulley A (1), and teeth B (21) are arranged on the belt pulley B (2); the method is characterized in that: further comprising a first transmission assembly (3) for a first direction drive pulley a (1) and a second transmission assembly (5) for a second direction drive pulley B (2), the first direction being opposite to the second direction;

the first transmission assembly (3) comprises a first fixed plate (31) and telescopic teeth A (32) which can be matched with the teeth A (11) to drive the belt pulley A (1) when the first fixed plate (31) extends, the first fixed plate (31) is fixedly arranged on the transmission shaft (4), the telescopic teeth A (32) are eccentrically hinged with the fixed plate (31) through a first hinge shaft (33) arranged along the radial direction of the transmission shaft (4), the gravity center is positioned on one side of the first hinge shaft (33) close to the belt pulley A (1), so that the telescopic teeth A (32) can be rotationally extended to be matched with the teeth A (11) in the direction close to the belt pulley A (1) when the transmission shaft (4) rotates in the first direction, and the telescopic teeth A (32) are rotationally retracted in the direction away from the belt pulley A (1) when the transmission shaft (4) rotates in the second direction, and one side of the telescopic teeth A (32) is provided with a first limiting table (34) which is matched with the telescopic teeth A (32) and is used for keeping the telescopic teeth A (32) in an extended state when the transmission shaft (4) rotates in the first direction;

the second transmission assembly (5) comprises a second fixing plate (51) and telescopic teeth B (52) which can be matched with the teeth B (21) to drive the belt pulley B (2) when the second fixing plate stretches out, the second fixing plate (51) is fixedly arranged on the transmission shaft (4), the telescopic teeth B (52) are eccentrically hinged with the second fixing plate (51) through a second hinge shaft (53) arranged along the radial direction of the transmission shaft (4), the center of gravity is located on one side, close to the belt pulley B (2), of the second hinge shaft (53), so that the telescopic teeth B (52) can stretch out in a rotating mode to be matched with the teeth B (21) in a direction close to the belt pulley B (2) when the transmission shaft (4) rotates in a second direction, the telescopic teeth B (52) can be retracted in a rotating mode to be away from the belt pulley B (2) when the transmission shaft (4) rotates in a first direction, and a second limiting table (54) which is matched with the telescopic teeth B (52) to be used for keeping the telescopic teeth B (52) in a stretching out state when the transmission shaft (4) rotates in the second direction.

2. The pulley changeover mechanism as in claim 1, wherein: the first fixing plate (31) and the second fixing plate (51) are the same fixing plate and are positioned between the belt pulley A (1) and the belt pulley B (2).

3. The pulley changeover mechanism as in claim 1, wherein: the first fixing plate (31) is also provided with a third limiting part (35) which is matched with one side of the telescopic tooth A (32) and used for limiting the position of the telescopic tooth A (32) so that the gravity center of the telescopic tooth A (32) is positioned at one side of the first hinge shaft (33) close to the belt pulley A (1) when the telescopic tooth A (32) is retracted; the second fixing plate (51) is also provided with a fourth limiting part (55) which is matched with one side of the telescopic tooth B (52) and used for limiting the position of the telescopic tooth B (52) so that the gravity center of the telescopic tooth B (52) is positioned at one side of the second hinge shaft (53) close to the belt pulley B (2) when the telescopic tooth B (52) is retracted.

4. The pulley changeover mechanism as in claim 1, wherein: the number of the telescopic teeth A (32) is multiple, the telescopic teeth A are uniformly distributed on the periphery of the first fixed plate (31), and the number of the telescopic teeth B (52) are also multiple, and the telescopic teeth B are uniformly distributed on the periphery of the second fixed plate (51).

5. The pulley changeover mechanism as claimed in claim 1 or 4, wherein: the side surface of the tooth A (11) close to the telescopic tooth A (32) is an inclined surface inclined to the extending direction of the telescopic tooth A (32), and the side surface of the tooth B (21) close to the telescopic tooth B (52) is an inclined surface inclined to the extending direction of the telescopic tooth B (52).

6. The pulley changeover mechanism as in claim 1, wherein: the first fixing plate (31) and the second fixing plate (51) are welded and fixed on the transmission shaft (4).

7. The pulley changeover mechanism as in claim 1, wherein: the belt pulley A (1) and the belt pulley B (2) are respectively rotatably arranged at two ends of the transmission shaft (4) through bearings.