Electric spindle with coupler

Abstract

The invention relates to the technical field of motorized spindles, in particular to a motorized spindle with a coupler, which comprises a spindle, an auxiliary shaft, a spring and a sleeve, the spring is placed between the auxiliary shaft and the sleeve, the spindle is connected with the sleeve, the auxiliary shaft can slide in the inner space of the sleeve, and the spring can slide in the inner space of the sleeve to realize extension and retraction. When the main shaft is overloaded, the auxiliary shaft retreats in the sleeve, and when the main shaft is overloaded, the auxiliary shaft advances in the sleeve under the action of the spring. The shaft coupler has the beneficial effects that the auxiliary shaft and the spring are arranged, so that the auxiliary shaft is automatically separated during overload, damage to the motor caused by overload is avoided, and when the overload of the main shaft disappears, the auxiliary shaft advances in the sleeve under the action of the spring, so that transmission of the main shaft and the auxiliary shaft is recovered; the device has the advantages of being large in transmission force and capable of automatically recovering the initial state after overload, and has great significance in guaranteeing production continuity.

Description

Technical Field

[0001] The invention relates to the technical field of electric spindles, and in particular to an electric spindle with a coupling. Background Art

[0002] Motor transmission technology is an indispensable part of modern industry and is widely used in various mechanical equipment, such as machine tools, cranes, conveyor belts, etc. The motor is connected to the mechanical equipment through the coupling to transmit torque and rotational motion. The role of the coupling is to transmit torque between the driving shaft and the driven shaft while allowing a certain degree of axial, radial and angular deviation, thereby compensating for manufacturing and installation errors and reducing the stress of the transmission system.

[0003] In motor transmission, couplings are usually used to prevent damage to the motor caused by overload. There are many types of couplings. One is electromagnetic, which transmits power through the attraction between two magnets. The torque it can transmit is small. The other is mechanical, which is damaged after an overload and cannot automatically recover to the state before the overload. The coupling needs to be replaced before the transmission can continue. Summary of the invention

[0004] In order to solve the problems in the above background technology, the present invention provides an electric spindle with a coupling for motor transmission, and solves the problem in the prior art that the motor transmission cannot automatically restore transmission after overload.

[0005] The solution adopted by the present invention to solve its technical problem is: an electric spindle with a coupling, comprising a main shaft, a secondary shaft, a spring, and a sleeve, wherein the main shaft is transmission-connected with the secondary shaft, the spring is placed between the secondary shaft and the sleeve, the main shaft is connected with the sleeve, the secondary shaft can slide in the inner space of the sleeve, the spring can slide in the inner space of the sleeve to achieve telescoping, a motor shaft hole for inserting the motor transmission shaft is provided in the middle of the secondary shaft, the motor shaft hole is a through hole, the motor shaft hole is non-circular, a motor shaft through hole for passing the motor transmission shaft is provided at the bottom of the sleeve, the diameter of the motor shaft through hole is smaller than the spiral diameter of the spring, when the main shaft is overloaded, the secondary shaft retreats in the sleeve so that the main shaft and the secondary shaft can be disengaged to avoid damage to the motor caused by overload, and when the main shaft overload disappears, the secondary shaft advances in the sleeve under the action of the spring so that the main shaft and the secondary shaft resume transmission.

[0006] In the above structure, the outer diameter of the main shaft is equal to the outer diameter of the secondary shaft.

[0007] In the above structure, the main shaft is provided with a main shaft center hole so as to avoid the motor transmission shaft.

[0008] In the above structure, the motor shaft hole is a hexagonal hole, and the diameter of the spindle center hole and the diameter of the motor shaft through hole are both larger than the diameter of the circle determined by the hexagonal vertices of the motor shaft hole.

[0009] In the above structure, the motor shaft hole is provided with a rounded corner on the side where the motor transmission shaft is inserted so as to facilitate smooth insertion of the motor transmission shaft.

[0010] In the above structure, the mating surface of the main shaft fits with the mating surface of the secondary shaft.

[0011] In the above structure, the shape of the main shaft mating surface is the same as that of the secondary shaft mating surface, and the mating surface is composed of the arc on the outer wall and the arc on the inner wall, and the arc on the outer wall and the arc on the inner wall are both composed of four arc segments. The arc on the outer wall is formed by the projection of a semicircular arc with a radius of R1 on the outer wall, and the arc on the inner wall is formed by the projection of a semicircular arc with a radius of R2 on the inner wall. The centers of the four semicircular arcs before projection are coplanar, R1 is half of the square root of 2 times the diameter of the outer wall, and R2 is half of the square root of 2 times the diameter of the inner wall.

[0012] In the above structure, the diameter of the inner space of the sleeve minus the outer diameter of the secondary shaft is less than times the diameter of the spring wire.

[0013] The above structure also includes a screw. The sleeve is provided with a screw through hole, and the main shaft is provided with a threaded hole for connecting with the screw. The screw passes through the screw through hole on the sleeve and is threadedly connected with the threaded hole on the main shaft to fix the sleeve on the main shaft.

[0014] In the above structure, the retractable length of the spring is greater than the length of the main shaft matching surface on the main shaft rotation center line, and the elastic force of the spring determines the load threshold when the main shaft and the secondary shaft are separated.

[0015] In summary, the beneficial effects of the present invention are as follows: by providing a secondary shaft and a spring, the secondary shaft is automatically disengaged when overloaded, thereby avoiding damage to the motor caused by overload; when the overload of the main shaft disappears, the secondary shaft advances in the sleeve under the action of the spring so that the main shaft and the secondary shaft resume transmission. Compared with other couplings, the present invention has the advantages of large transmission force and the ability to automatically restore to the initial state after overload, which is of great significance for ensuring the continuity of production.

[0016] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A perspective view of the present invention;

[0018] Figure 2 An exploded view of the present invention;

[0019] Figure 3 It is an exploded view from another angle of the present invention;

[0020] Figure 4 It is the front view of the mating surface;

[0021] Figure 5 It is a front view of the mating surface from another angle;

[0022] Figure 6 It is a three-dimensional diagram of the secondary shaft of the present invention.

[0023] In the figure: 1. Main shaft; 2. Secondary shaft; 3. Spring; 4. Sleeve; 5. Motor shaft hole; 6. Motor shaft through hole; 7. Main shaft center hole; 8. Fillet; 9. Screw; 10. Screw through hole; 11. Threaded hole; 12. Mating surface. DETAILED DESCRIPTION

[0024] In order to make the content of the present invention more clearly understood, the present invention is further described below based on specific embodiments in conjunction with the accompanying drawings.

[0025] It should be noted that the terms "center", "upper", "lower", "front", "back", "left", "right", "inner", "outer" and the like used herein to indicate directions or positional relationships are based on directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. Unless otherwise specified, "plurality" means two or more.

[0026] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0027] With reference to the accompanying drawings, an electric spindle with a coupling comprises a main shaft 1, a secondary shaft 2, a spring 3, and a sleeve 4, wherein the main shaft 1 is connected to the secondary shaft 2 in a transmission manner, the spring 3 is placed between the secondary shaft 2 and the sleeve 4, the main shaft 1 is connected to the sleeve 4, the secondary shaft 2 can slide in the inner space of the sleeve 4, the spring 3 can slide in the inner space of the sleeve 4 to achieve telescoping, a motor shaft hole 5 for inserting the motor drive shaft is provided in the middle of the secondary shaft 2, the motor shaft hole 5 is a through hole, the motor shaft hole 5 is non-circular so that the motor can be driven through the main shaft 1 and the secondary shaft 2, a motor shaft through hole 6 for the motor drive shaft to pass through is provided at the bottom of the sleeve 4, the diameter of the motor shaft through hole 6 is smaller than the spiral diameter of the spring 3, when the main shaft 1 is overloaded, the secondary shaft 2 retreats in the sleeve 4 so that the main shaft 1 and the secondary shaft 2 are disengaged to avoid damage to the motor caused by overload, when the overload of the main shaft 1 disappears, the secondary shaft 2 advances in the sleeve 4 under the action of the spring 3 so that the main shaft 1 and the secondary shaft 2 resume transmission.

[0028] Furthermore, the outer diameter of the main shaft 1 is equal to the outer diameter of the secondary shaft 2. This makes the space for the secondary shaft 2 to shake in the sleeve 4 small.

[0029] Furthermore, the main shaft 1 is provided with a main shaft center hole 7 so as to avoid the motor transmission shaft.

[0030] Furthermore, the motor shaft hole 5 is a hexagonal hole, and the diameter of the spindle center hole 7 and the diameter of the motor shaft through hole 6 are both larger than the diameter of the circle determined by the hexagonal vertices of the motor shaft hole 5. The hexagonal hole is the most commonly used motor transmission shaft.

[0031] Furthermore, the motor shaft hole 5 is provided with a rounded corner 8 on the side where the motor transmission shaft is inserted so as to facilitate smooth insertion of the motor transmission shaft.

[0032] Furthermore, the mating surface 12 of the main shaft 1 fits with the mating surface 12 of the secondary shaft 2 so as to bear uneven force.

[0033] Furthermore, the shape of the mating surface 12 of the main shaft 1 is the same as that of the mating surface 12 of the secondary shaft 2. The mating surface 12 is formed by the arc on the outer wall and the arc on the inner wall with the shortest distance between them, wherein the arc on the outer wall and the arc on the inner wall are both composed of four arc segments, the arc on the outer wall is formed by the projection of a semicircular arc with a radius R1 on the outer wall, and the arc on the inner wall is formed by the projection of a semicircular arc with a radius R2 on the inner wall, and the centers of the four semicircular arcs are coplanar before projection, R1 is half of the square root of 2 times the diameter of the outer wall, and R2 is half of the square root of 2 times the diameter of the inner wall. Assuming that the plane where the centers of the four semicircular arcs are coplanar before projection is the neutral plane, the arc on the outer wall and the arc on the inner wall have two arc segments above and below the neutral plane respectively, and are connected alternately in sequence.

[0034] Furthermore, the diameter of the inner space of the sleeve 4 minus the outer diameter of the secondary shaft 2 is less than twice the diameter of the spring 3 wire to prevent the spring 3 from being stuck in the gap.

[0035] Furthermore, it also includes a screw 9, the sleeve 4 is provided with a screw through hole 10, and the main shaft 1 is provided with a threaded hole 11 for connecting with the screw 9. The screw 9 passes through the screw through hole 10 on the sleeve 4 and is threadedly connected with the threaded hole 11 on the main shaft 1 to fix the sleeve 4 on the main shaft 1.

[0036] Furthermore, the retractable length of the spring 3 is greater than the length of the mating surface of the main shaft 1 on the rotation center line of the main shaft 1 so that the secondary shaft 2 can be separated from the main shaft 1, and the elastic force of the spring 3 determines the load threshold when the main shaft 1 and the secondary shaft 2 are separated.

[0037] The present invention sets a secondary shaft 2 and a spring 3 so that the secondary shaft 2 automatically disengages when overloaded, thereby avoiding damage to the motor caused by overload. When the overload of the main shaft 1 disappears, the secondary shaft 2 advances in the sleeve 4 under the action of the spring 3 so that the main shaft 1 and the secondary shaft 2 resume transmission. Compared with other couplings, the present invention has the advantages of large transmission force and automatic recovery to the initial state after overload, which is of great significance to ensuring the continuity of production. Especially the mechanical type, which is damaged after an overload and cannot automatically recover to the state before the overload. The transmission can only continue after the coupling is replaced, which leads to interruption of production and waste of maintenance labor. For electromagnetic couplings, the transmission is based on the attraction between two magnets, and the torque it can transmit is relatively small. The transmission torque of the coupling of the present invention can use a spring made of thick spring wire to increase the threshold of clutch during overload.

[0038] The embodiments described above are only preferred implementation modes of the present invention and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and modifications made by those skilled in the art on the basis of the invention shall fall within the protection scope of the present invention.

Claims

1. An electric spindle with a coupling, characterized in that: It includes a main shaft, a secondary shaft, a spring, and a sleeve, wherein the main shaft is transmission-connected with the secondary shaft, the spring is placed between the secondary shaft and the sleeve, the main shaft is connected with the sleeve, the secondary shaft can slide in the inner space of the sleeve, the spring can slide in the inner space of the sleeve, a motor shaft hole for inserting the motor transmission shaft is provided in the middle of the secondary shaft, the motor shaft hole is a through hole, the motor shaft hole is non-circular, a motor shaft through hole for passing the motor transmission shaft is provided at the bottom of the sleeve, the diameter of the motor shaft through hole is smaller than the spiral diameter of the spring, when the main shaft is overloaded, the secondary shaft retreats in the sleeve, and when the main shaft overload disappears, the secondary shaft advances in the sleeve under the action of the spring.

2. The electric spindle according to claim 1, characterized in that: The outer diameter of the main shaft is equal to the outer diameter of the secondary shaft.

3. The electric spindle according to claim 1, characterized in that: The main shaft is provided with a main shaft center hole.

4. The electric spindle according to claim 1, characterized in that: The motor shaft hole is a hexagonal hole, and the diameter of the main shaft center hole and the diameter of the motor shaft through hole are both larger than the diameter of the circle determined by the hexagonal vertices of the motor shaft hole.

5. The electric spindle according to claim 1, characterized in that: The motor shaft hole is provided with a rounded corner on one side where the motor transmission shaft is inserted.

6. The electric spindle according to claim 1, characterized in that: The mating surface of the main shaft is in contact with the mating surface of the secondary shaft.

7. The electric spindle according to claim 6, characterized in that: The shape of the main shaft mating surface is the same as that of the secondary shaft mating surface, and the mating surface is composed of the arc on the outer wall and the arc on the inner wall, wherein the arc on the outer wall and the arc on the inner wall are both composed of four arc segments, the arc on the outer wall is formed by the projection of a semicircular arc with a radius R1 on the outer wall, and the arc on the inner wall is formed by the projection of a semicircular arc with a radius R2 on the inner wall, and the centers of the four semicircular arcs before projection are coplanar, R1 is half of the square root of 2 times the diameter of the outer wall, and R2 is half of the square root of 2 times the diameter of the inner wall.

8. The electric spindle according to claim 6, characterized in that: The retractable length of the spring is greater than the length of the main shaft matching surface on the main shaft rotation center line, and the elastic force of the spring determines the load threshold when the main shaft and the secondary shaft are separated.

9. The electric spindle according to claim 1, characterized in that: The diameter of the inner space of the sleeve minus the outer diameter of the secondary shaft is less than times the diameter of the spring wire.

10. The electric spindle according to claim 1, characterized in that: It also includes a screw, the sleeve is provided with a screw through hole, the main shaft is provided with a threaded hole for connecting with the screw, and the screw passes through the screw through hole on the sleeve and is threadedly connected with the threaded hole on the main shaft to fix the sleeve on the main shaft.

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