阅读说明：本技术 一种带缓启动的联轴器及其工作方法 (Coupler with slow start and working method thereof ) 是由 许红伍 刘家骅 咸彤彤 于 2021-08-16 设计创作，主要内容包括：本发明公开了本发明提供了一种带缓启动的联轴器,包括：第一联轴器衬套、负载轴、第二联轴器衬套、电机轴和缓启动组件,所述负载轴通过第一键与第一联轴器衬套连接,所述第二联轴器衬套设于第一联轴器衬套远离负载轴的一端,且所述第二联轴器衬套与第一联轴器衬套的接触面为间隙配合,所述电机轴通过第二键与第二联轴器衬套连接,且相互间为圆周间隙配合,所述缓启动组件设于第一联轴器衬套内,并与第二联轴器衬套相配合。本发明结构简单、设计合理、易于生产,通过在联轴器中设置缓启动组件,让电机在启动时实现缓启动,能够对电机起到很好的保护,该联轴器便于安装和拆卸,同时各个部件间相互配合,提高了其连接和使用的稳定性和可靠性。(The invention discloses a coupler with slow start, which comprises: first shaft coupling bush, load axle, second shaft coupling bush, motor shaft slow start-up subassembly, the load axle is connected with first shaft coupling bush through first key, the one end that the load axle was kept away from to first shaft coupling bush is located to the second shaft coupling bush, just the contact surface of second shaft coupling bush and first shaft coupling bush is clearance fit, the motor shaft passes through the second key and is connected with second shaft coupling bush, and is circumference clearance fit each other, the subassembly that slowly starts is located in first shaft coupling bush to cooperate with second shaft coupling bush. The motor starting device is simple in structure, reasonable in design and easy to produce, the motor is started slowly by arranging the slow starting assembly in the coupler, the motor can be well protected, the coupler is convenient to mount and dismount, and meanwhile, all parts are matched with each other, so that the stability and the reliability of connection and use of the coupler are improved.)

1. The utility model provides a take shaft coupling of slow start-up which characterized in that: the method comprises the following steps: first shaft coupling bush (1), load axle (2), second shaft coupling bush (3), motor shaft (4) and gentle start-up subassembly (5), load axle (2) are connected with first shaft coupling bush (1) through first key (6), the one end that load axle (2) were kept away from in first shaft coupling bush (1) is located in second shaft coupling bush (3), just second shaft coupling bush (3) are clearance fit with the contact surface of first shaft coupling bush (1), motor shaft (4) are connected with second shaft coupling bush (3) through second key (7), and are circumference clearance fit each other, slowly start-up subassembly (5) and locate in first shaft coupling bush (1) to cooperate with second shaft coupling bush (3).

2. The coupling with slow start of claim 1, wherein: the slow starting assembly (5) comprises a first slow starting mechanism (51) and a second slow starting mechanism (52), wherein the first slow starting mechanism (51) and the second slow starting mechanism (52) are arranged on the first coupler bushing (1), and the second slow starting mechanism (52) is matched with the second coupler bushing (3).

3. The coupling with slow start of claim 2, wherein: first slow starting mechanism (51) include traveller (511), tension spring (512) and locating pin (513), the one end of traveller (511) is located in tension spring (512), the one end that tension spring (512) kept away from traveller (511) is located in locating pin (513) to inlay in first shaft coupling bush (1), tension spring (512) one end is caught traveller (511), and locating pin (513) are caught to the other end.

4. A coupling with a slow start according to claim 3, characterized in that: the second slow starting mechanism (52) comprises a friction plate (521), a spherical bushing (522), a supporting block (523), a compression spring (524) and a tacking screw (525), the friction plate (521) is connected with the first coupler bushing (1) through a rotating pin (526), the spherical bushing (522) is arranged on one side of the friction plate (521), one end of the compression spring (523) is arranged in the spherical bushing (522), the other end of the compression spring abuts against the supporting block (523), and the tacking screw (525) is arranged on the other end face of the supporting block (523).

5. The coupling with slow start of claim 4, wherein: the first coupling bush (1) comprises a first coupling bush body (11), a first end face (12) is arranged in the first coupling bush body (11), a group of sliding column holes (13) are arranged on the periphery of the inner wall of the first coupling bush body (11), a group of step grooves (14) are arranged on one sides of the sliding column holes (13), rotating pin holes (15) are formed in the step grooves (14), limiting grooves (16) are arranged on one sides of the rotating pin holes (15), step holes (17) are formed in the side walls of the step grooves (14), a group of positioning pin holes (18) are formed in the first end face (12), the sliding columns (511) are arranged in the sliding column holes (13), one ends of positioning pins (513) are inserted into the positioning pin holes (18), the friction plates (521) are arranged in the step grooves (14), the rotating pins (526) penetrate through the friction plates (521) and are embedded in the rotating pin holes (15), and the boss on the friction plate (521) is arranged in the limit groove (16), and the support block (523) and the clinch screw (525) are arranged in the step hole (17).

6. The coupling with slow start of claim 5, wherein: one side of the first coupling bushing (1) located on the first end face (12) is provided with a small end cover (19), the small end cover (19) is connected with the first coupling bushing (1) through a screw, and the small end cover (19) presses the outer side of the positioning pin (513).

7. The coupling with slow start of claim 4, wherein: and one side of the friction plate (521) is provided with an arc surface, the arc surface is matched with the spherical bushing (522), and the arc surface and the spherical bushing rotate relatively.

8. The coupling with slow start of claim 5, wherein: the second coupling bush (3) comprises a second coupling bush body (31), a step surface (32) is arranged in the second coupling bush body (31), an inner boss (33) is arranged on the inner side of the step surface (32), the inner boss (33) is extruded on the outer surface of the friction plate (521), a group of grooves (34) are formed in the inner wall of the second coupling bush body (31), a large-end cover (35) is arranged in the step surface (32), and the large-end cover (35) is connected with the second coupling bush body (31) through screws.

9. The coupling with slow start of claim 8, wherein: the groove (34) is matched with the sliding column (511), the width of the groove is 0.2mm larger than that of the sliding column (511), and the port part of the groove is rounded.

10. Method of operating a coupling with slow start according to any of claims 1 to 9, characterized in that: the specific working method is as follows: 1): firstly, assembling a coupler, namely respectively placing a first key (6) and a second key (7) on a load shaft (2) and a motor shaft (4), penetrating a first coupler bush (1) onto the load shaft (2), and adjusting the relative positions of the load shaft (2) and the motor shaft (4) through centering of a motor flange and the load flange to enable the load shaft (2) and the motor shaft (4) to be coaxially arranged;

2): moving the coupler to enable the second coupler bush (3) to be flush with the root of the motor shaft (4), enabling a certain axial distance to be generated between the right end of the first coupler bush (1) and the inner surface of the second coupler bush (3), changing the distance according to different axial distances between the load shaft (2) and the motor shaft (4), and screwing a set screw after the position of the coupler is adjusted;

3): the motor is started, the motor drives the second coupler bush (3) to rotate through the motor shaft (4) when rotating, and because the inner boss (33) on the second coupler bush (3) is arranged on the friction plate (521) on the coupler bush (1) in an extrusion manner, when the motor is started, the second coupler bush (3) does not rotate for a circle and can bring an angular momentum to the friction plate (521), and the periodic angular momentum brought to the friction plate (521) can gradually accelerate the coupler bush (1) and the load shaft (2);

4): when the speed is accelerated to a certain degree in the previous step, the sliding column (511) slides into the groove (34) of the second coupling bushing (3) under the action of centrifugal force, and at the moment, the second coupling bushing (3) drives the first coupling bushing (1) and the load shaft (2) to synchronously rotate through the sliding column (511);

5): when the work needs to be stopped, the motor decelerates, the load shaft (2) synchronously decelerates along with the motor when the motor decelerates, when the speed of the load shaft (2) is low to a certain degree, the centripetal force borne by the sliding column (511) is reduced, and the sliding column completely slides into the first coupling bush (1) under the action of the tension spring (512);

6): when the sliding columns (511) are all slid into the first coupling bush (1), the first coupling bush (1) and the second coupling bush (3) do not synchronously move any more;

7): and (3) turning off the motor to stop the motor from rotating, and gradually reducing the speed of the load shaft (2) to stop rotating in the process.

Technical Field

The invention belongs to the technical field of couplings, and particularly relates to a coupling with slow start and a working method thereof.

Background

The coupling is also called coupling. Mechanical parts for firmly coupling the driving shaft and the driven shaft in different mechanisms to rotate together and transmitting motion and torque. Sometimes also to couple the shaft with other parts (e.g. gears, pulleys, etc.). Usually, the two halves are combined and fastened to the two shaft ends by a key or a tight fit, and then the two halves are connected in a certain way.

The existing loading machine and motor installation modes are various, in order to guarantee the use safety and stability, a complex structure is often adopted for connection, the existing connection structure brings much inconvenience for the installation and the disassembly of the heavy loading machine and the motor, and in the use process, the problem of overlarge starting load can also occur, so that the motor is easily damaged to a certain extent, and the existing connection mode of the loading machine and the motor is still required to be improved.

Disclosure of Invention

The purpose of the invention is as follows: in order to overcome the defects, the invention aims to provide the coupler with the slow start function, the coupler is simple in structure, reasonable in design and easy to produce, the slow start component is arranged in the coupler, the motor is started slowly, the motor can be well protected, meanwhile, the coupler is convenient to mount and dismount, all parts are matched with each other, and the stability and the reliability of connection and use of the coupler are greatly improved.

The technical scheme is as follows: in order to achieve the above object, the present invention provides a coupling with slow start, comprising: first shaft coupling bush, load axle, second shaft coupling bush, motor shaft slow start-up subassembly, the load axle is connected with first shaft coupling bush through first key, the one end that the load axle was kept away from to first shaft coupling bush is located to the second shaft coupling bush, just the contact surface of second shaft coupling bush and first shaft coupling bush is clearance fit, the motor shaft passes through the second key and is connected with second shaft coupling bush, and is circumference clearance fit each other, the subassembly that slowly starts is located in first shaft coupling bush to cooperate with second shaft coupling bush. The coupler with the slow start function is simple in structure, reasonable in design and easy to produce, the slow start component is arranged in the coupler, so that the motor can be started slowly when being started, the motor can be well protected, meanwhile, the coupler is convenient to mount and dismount, all parts are matched with each other, the stability and the reliability of connection and use of the coupler are greatly improved, and the coupler can better meet the production requirement.

The slow starting assembly comprises a first slow starting mechanism and a second slow starting mechanism, the first slow starting mechanism and the second slow starting mechanism are arranged on the first coupler bushing, and the second slow starting mechanism is matched with the second coupler bushing.

Furthermore, the first slow starting mechanism comprises a sliding column, a tension spring and a positioning pin, the tension spring is arranged at one end of the sliding column, the positioning pin is arranged at one end, far away from the sliding column, of the tension spring and is embedded in the first coupler bush, one end of the tension spring hooks the sliding column, and the other end of the tension spring hooks the positioning pin.

Furthermore, the second slow starting mechanism comprises a friction plate, a spherical bushing, a supporting block, a compression spring and a tacking screw, the friction plate is connected with the first coupling bushing through a rotating pin, the spherical bushing is arranged on one side of the friction plate, one end of the compression spring is arranged in the spherical bushing, the other end of the compression spring abuts against the supporting block, and the tacking screw is arranged on the other end face of the supporting block.

Preferably, the first coupling bush comprises a first coupling bush body, a first end face is arranged in the first coupling bush body, a group of sliding column holes are formed in the periphery of the inner wall of the first coupling bush body, a group of step grooves are formed in one side, located in the sliding column holes, of the sliding column, rotating pin holes are formed in the step grooves, limiting grooves are formed in one side, located in the rotating pin holes, of the step grooves, step holes are formed in the side walls of the step grooves, a group of positioning pin holes are formed in the first end face, the sliding column is arranged in the sliding column holes, one end of each positioning pin is inserted into the corresponding positioning pin hole, the friction plates are arranged in the step grooves, the rotating pins are embedded into the rotating pin holes after penetrating through the friction plates, bosses on the friction plates are arranged in the limiting grooves, and the support blocks and the fastening screws are arranged in the step holes.

Further preferably, a small end cover is arranged on one side, located on the first end face, of the first coupler bushing, the small end cover is connected with the first coupler bushing through a screw, and the small end cover presses the outer side of the positioning pin.

Still further preferably, one side of the friction plate is provided with an arc surface, and the arc surface is matched with the spherical bushing, so that the arc surface and the spherical bushing rotate relatively. The spherical bush is matched with the cambered surface of the friction plate, so that relative rotation can be realized,

in addition, the second coupling bush comprises a second coupling bush body, a step surface is arranged in the second coupling bush body, an inner boss is arranged on the inner side of the step surface and is extruded on the outer surface of the friction plate, a group of grooves are formed in the inner wall of the second coupling bush body, a large end cover is arranged in the step surface, and the large end cover is connected with the second coupling bush body through screws. The inner boss is arc-shaped, is staggered with the friction plate during installation, and forms dynamic friction with the friction plate during rotation to bring periodic angular momentum to the friction plate; the large end shield can prevent the friction plate from moving axially.

Preferably, the groove is matched with the sliding column, the width of the groove is 0.2mm larger than that of the sliding column, and the port part of the groove is rounded.

The invention relates to a working method of a coupler with slow start, which comprises the following specific working methods: 1): firstly, assembling a coupler, namely respectively placing a first key and a second key on a load shaft and a motor shaft, then penetrating a first coupler bush on the load shaft, and adjusting the relative positions of the load shaft and the motor shaft through centering of a motor flange and the load flange to enable the load shaft and the motor shaft to be coaxially arranged;

2): moving the coupler to enable the second coupler bush to be flush with the root of the motor shaft, so that a certain axial distance is generated between the right end of the first coupler bush and the inner surface of the second coupler bush, the distance can be changed according to different axial distances between the load shaft and the motor shaft, and screwing a set screw after the position of the coupler is adjusted;

3): the motor is started, the motor drives the second coupler bush to rotate through the motor shaft when rotating, and because the inner boss on the second coupler bush extrudes the friction plate arranged on the coupler bush, when the motor is started, the second coupler bush (3) does not rotate for a circle and can bring an angular momentum to the friction plate (521), and the periodic angular momentum brought to the friction plate (521) can gradually accelerate the coupler bush (1) and the load shaft (2);

4): when the acceleration reaches a certain degree in the previous step, the sliding column slides into the groove of the second coupler bushing under the action of centrifugal force, and the second coupler bushing drives the first coupler bushing and the load shaft to synchronously rotate through the sliding column;

5): when the work needs to be stopped, the motor decelerates, the load shaft synchronously decelerates along with the motor when the motor decelerates, and when the speed of the load shaft is low to a certain degree, the centripetal force borne by the sliding column is reduced and the sliding column completely slides into the first coupling bush under the action of the tension spring;

6): when the sliding column completely slides into the first coupling bushing, the first coupling bushing and the second coupling bushing do not synchronously move any more;

7): and turning off the motor to stop the motor, wherein the load shaft gradually decelerates to stop rotating in the process.

The technical scheme shows that the invention has the following beneficial effects:

1. the coupler with the slow start function is simple in structure, reasonable in design and easy to produce, the structure of the whole coupler is optimized, the production cost is reduced, the processing economy of the coupler is effectively improved, the slow start component is arranged in the coupler, the motor is started slowly when being started, the motor can be well protected, meanwhile, the coupler is convenient to mount and dismount, meanwhile, the stability and the reliability of connection and use of the coupler are greatly improved due to clearance fit among components and the use of the first key and the second key, and the coupler can better meet the production requirement.

2. The time and the speed of the slow start of the coupler with the slow start can be adjusted according to actual needs, the periodic angular momentum of the friction plate, which is firstly brought by the second coupler bush, of the load shaft is gradually accelerated, when the speed reaches a certain degree, the sliding column slides into the groove of the second coupler bush under the action of centrifugal force, the second coupler bush drives the first coupler bush to rotate together through the sliding column, and the speed of the second coupler bush is adjusted by adjusting the rotating speed of the motor shaft, so that the start time and the speed of the coupler are adjusted.

Drawings

FIG. 1 is a schematic structural view of a coupler with a slow start according to the present invention;

FIG. 2 is a top view of the present invention;

FIG. 3 is a cross-sectional view at C-C in the present invention;

FIG. 4 is a cross-sectional view taken at view B-B of the present invention;

FIG. 5 is a cross-sectional view of a first coupling bushing of the present invention;

FIG. 6 is a schematic view of a first coupling bushing of the present invention;

FIG. 7 is a schematic view of a second coupling bushing according to the present invention;

FIG. 8 is a schematic structural view of a second slow start mechanism according to the present invention;

FIG. 9 is a schematic view of the structure of the strut in the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example 1

A coupler with slow start as shown in the figure, comprising: first shaft coupling bush 1, load axle 2, second shaft coupling bush 3, motor shaft 4 slow start subassembly 5, wherein, slow start subassembly 5 includes that first slow starting mechanism 51 and second slow starting mechanism 52, load axle 2 is connected with first shaft coupling bush 1 through first key 6, second shaft coupling bush 3 locates the one end that load axle 2 was kept away from to first shaft coupling bush 1, just second shaft coupling bush 3 is clearance fit with the contact surface of first shaft coupling bush 1, motor shaft 4 is connected with second shaft coupling bush 3 through second key 7, and is circumference clearance fit each other, first slow starting mechanism 51 and second slow starting mechanism 52 all locate on first shaft coupling bush 1, just the second slow starting mechanism 52 cooperates with second shaft coupling bush 3.

In this embodiment, the first slow start mechanism 51 includes a sliding column 511, a tension spring 512 and a positioning pin 513, the tension spring 512 is disposed at one end of the sliding column 511, the positioning pin 513 is disposed at one end of the tension spring 512 far from the sliding column 511 and embedded in the first coupling bushing 1, one end of the tension spring 512 hooks the sliding column 511, and the other end hooks the positioning pin 513.

In this embodiment, the second slow start mechanism 52 includes a friction plate 521, a spherical bushing 522, a holder 523, a compression spring 524, and a set screw 525, where the friction plate 521 is connected to the first coupling bushing 1 through a rotating pin 526, the spherical bushing 522 is disposed on one side of the friction plate 521, one end of the compression spring 523 is disposed in the spherical bushing 522, the other end of the compression spring butts against the holder 523, and the set screw 525 is disposed on the other end surface of the holder 523.

In this embodiment, the first coupling bush 1 comprises a first coupling bush body 11, a first end face 12 is arranged in the first coupling bush body 11, a group of sliding column holes 13 are arranged on the periphery of the inner wall of the first coupler bushing body 11, a group of step grooves 14 are arranged on one side of the sliding column holes 13, a rotating pin hole 15 is arranged in the step groove 14, a limiting groove 16 is arranged on the rotating pin hole 15, and the side wall of the stepped groove 14 is provided with a stepped hole 17, the first end face 12 is provided with a group of positioning pin holes 18, the sliding column 511 is arranged in the sliding column hole 13, one end of the positioning pin 513 is inserted into the positioning pin hole 18, the friction plate 521 is arranged in the stepped groove 14, the rotating pin 526 penetrates through the friction plate 521 and then is embedded in the rotating pin hole 15, and the boss on the friction plate 521 is arranged in the limit groove 16, and the support block 523 and the clinch screw 525 are arranged in the step hole 17.

In this embodiment, a small end cover 19 is disposed on one side of the first coupling bush 1 on the first end surface 12, the small end cover 19 is connected with the first coupling bush 1 through a screw, and the small end cover 19 presses the outer side of the positioning pin 513.

In this embodiment, the second coupling bush 3 includes a second coupling bush body 31, a step surface 32 is provided in the second coupling bush body 31, an inner boss 33 is provided on an inner side of the step surface 32, the inner boss 33 is pressed on an outer surface of the friction plate 521, a group of grooves 34 is provided on an inner wall of the second coupling bush body 31, a large end cover 35 is provided in the step surface 32, and the large end cover 35 is connected to the second coupling bush body 31 through a screw.

Example 2

A coupler with slow start as shown in the figure, comprising: first shaft coupling bush 1, load axle 2, second shaft coupling bush 3, motor shaft 4 slow start subassembly 5, wherein, slow start subassembly 5 includes that first slow starting mechanism 51 and second slow starting mechanism 52, load axle 2 is connected with first shaft coupling bush 1 through first key 6, second shaft coupling bush 3 locates the one end that load axle 2 was kept away from to first shaft coupling bush 1, just second shaft coupling bush 3 is clearance fit with the contact surface of first shaft coupling bush 1, motor shaft 4 is connected with second shaft coupling bush 3 through second key 7, and is circumference clearance fit each other, first slow starting mechanism 51 and second slow starting mechanism 52 all locate on first shaft coupling bush 1, just the second slow starting mechanism 52 cooperates with second shaft coupling bush 3.

In this embodiment, the first slow start mechanism 51 includes a sliding column 511, a tension spring 512 and a positioning pin 513, the tension spring 512 is disposed at one end of the sliding column 511, the positioning pin 513 is disposed at one end of the tension spring 512 far from the sliding column 511 and embedded in the first coupling bushing 1, one end of the tension spring 512 hooks the sliding column 511, and the other end hooks the positioning pin 513.

In this embodiment, the second slow start mechanism 52 includes a friction plate 521, a spherical bushing 522, a holder 523, a compression spring 524, and a set screw 525, where the friction plate 521 is connected to the first coupling bushing 1 through a rotating pin 526, the spherical bushing 522 is disposed on one side of the friction plate 521, one end of the compression spring 523 is disposed in the spherical bushing 522, the other end of the compression spring butts against the holder 523, and the set screw 525 is disposed on the other end surface of the holder 523.

In this embodiment, the first coupling bush 1 comprises a first coupling bush body 11, a first end face 12 is arranged in the first coupling bush body 11, a group of sliding column holes 13 are arranged on the periphery of the inner wall of the first coupler bushing body 11, a group of step grooves 14 are arranged on one side of the sliding column holes 13, a rotating pin hole 15 is arranged in the step groove 14, a limiting groove 16 is arranged on the rotating pin hole 15, and the side wall of the stepped groove 14 is provided with a stepped hole 17, the first end face 12 is provided with a group of positioning pin holes 18, the sliding column 511 is arranged in the sliding column hole 13, one end of the positioning pin 513 is inserted into the positioning pin hole 18, the friction plate 521 is arranged in the stepped groove 14, the rotating pin 526 penetrates through the friction plate 521 and then is embedded in the rotating pin hole 15, and the boss on the friction plate 521 is arranged in the limit groove 16, and the support block 523 and the clinch screw 525 are arranged in the step hole 17.

In this embodiment, a small end cover 19 is disposed on one side of the first coupling bush 1 on the first end surface 12, the small end cover 19 is connected with the first coupling bush 1 through a screw, and the small end cover 19 presses the outer side of the positioning pin 513.

In this embodiment, an arc surface is disposed on one side of the friction plate 521, and the arc surface is engaged with the spherical bushing 522 to perform a relative rotation motion.

In this embodiment, the second coupling bush 3 includes a second coupling bush body 31, a step surface 32 is provided in the second coupling bush body 31, an inner boss 33 is provided on an inner side of the step surface 32, the inner boss 33 is pressed on an outer surface of the friction plate 521, a group of grooves 34 is provided on an inner wall of the second coupling bush body 31, a large end cover 35 is provided in the step surface 32, and the large end cover 35 is connected to the second coupling bush body 31 through a screw.

In this embodiment, the groove 34 is matched with the sliding column 511, the width of the groove is 0.2mm larger than that of the sliding column 511, and the port part of the groove is rounded.

The working method of the coupler with the slow start in this embodiment includes the following specific working methods: 1): firstly, assembling a coupler, namely respectively placing a first key 6 and a second key 7 on a load shaft 2 and a motor shaft 4, then penetrating a first coupler bush 1 on the load shaft 2, and adjusting the relative positions of the load shaft 2 and the motor shaft 4 through centering of a motor flange and the load flange to enable the load shaft 2 and the motor shaft 4 to be coaxially arranged;

2): moving the coupler to enable the second coupler bush 3 to be flush with the root of the motor shaft 4, enabling a certain axial distance to be generated between the right end of the first coupler bush 1 and the inner surface of the second coupler bush 3, changing the distance according to different axial distances between the load shaft 2 and the motor shaft 4, and screwing a set screw after the position of the coupler is adjusted;

3): the motor is started, the motor drives the second coupler bush 3 to rotate through the motor shaft 4 when rotating, and because the inner boss 33 on the second coupler bush 3 extrudes the friction plate 521 arranged on the coupler bush 1, when starting, the second coupler bush 3 can give an angular momentum to the friction plate 521 without rotating for a circle, and the periodic angular momentum given to the friction plate 521 can gradually accelerate the coupler bush 1 and the load shaft 2;

4): when the acceleration reaches a certain degree in the previous step, the sliding column 511 slides into the groove 34 of the second coupling bushing 3 under the action of centrifugal force, and at the moment, the second coupling bushing 3 drives the first coupling bushing 1 and the load shaft 2 to synchronously rotate through the sliding column 511;

5): when the work needs to be stopped, the motor decelerates, the load shaft 2 synchronously decelerates along with the motor when the motor decelerates, and when the speed of the load shaft 2 is low to a certain degree, the centripetal force borne by the sliding column 511 is reduced, and the sliding column 511 completely slides into the first coupling bush 1 under the action of the tension spring 512;

6): when the sliding columns 511 are all slid into the first coupling bush 1, the first coupling bush 1 and the second coupling bush 3 do not move synchronously any more;

7): the motor is turned off to stop the rotation of the motor, and the load shaft 2 is gradually decelerated to stop the rotation in the process.

In this embodiment, the dynamic friction force between the friction plate 521 and the second coupling bushing 3 is adjustable by the set screw, and the larger the friction force between them is, the larger the angular momentum for driving the first coupling bushing 1 to rotate is, the faster the acceleration is, the faster the start is, otherwise, the slow (similar to a whip spinning top).

The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.