Internal driving type main shaft

Abstract

The utility model discloses an internal driving type main shaft, and relates to the technical field of balance detection. The internal driving type main shaft comprises a hollow shell and a shaft body which is rotatably arranged in the shell around the axis of the shaft body, a cavity is formed between the shaft body and the shell, and a driving part used for driving the shaft body to rotate is contained in the cavity. According to the internal driving type main shaft, the driving piece is arranged in the shell, so that the driving piece can directly drive the shaft body in the main shaft, the lateral pulling force generated by an external motor to the main shaft is effectively eliminated, meanwhile, the vibration of a belt is also eliminated, and the balance detection precision of a rotary body is effectively improved.

Description

Technical Field

[0001] The present application relates to the field of balance detection, and in particular to an internally driven spindle. Background Art

[0002] A balancing machine is a device used to check the balance of rotating objects. It is equipped with a spindle and sensors. During testing, the object is placed on the spindle, which drives the object to rotate. The sensor detects the amount of vibration generated during rotation, thereby detecting the imbalance of the object.

[0003] The spindle of a conventional balancing machine is driven by an external motor, mounted to the side of the spindle and connected by a belt drive. However, when the external motor drives the spindle through the belt, it exerts a certain amount of lateral tension on the spindle, causing the spindle to vibrate during rotation, which seriously affects the accuracy of the balance test of the rotating object. Furthermore, the belt itself also produces a certain degree of vibration during the transmission process, which also affects the accuracy of the balance test of the rotating object. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the present application provides an internally driven spindle capable of eliminating external interference forces applied to the spindle during its rotation.

[0005] The internal drive spindle provided in this application adopts the following technical solution:

[0006] An internally driven spindle comprises a hollow outer shell and a shaft body rotatable around its own axis and arranged in the outer shell. A cavity is formed between the shaft body and the outer shell, and a driving member for driving the shaft body to rotate is placed in the cavity.

[0007] By adopting the above technical solution, the driving component is built into the housing, so that the driving component can directly drive the shaft body inside the main shaft, effectively eliminating the lateral pull on the main shaft generated by the external motor, and also eliminating the vibration of the belt itself, effectively improving the balance detection accuracy of the rotating body.

[0008] In a specific possible implementation scheme, the cavity surrounds the circumference of the shaft body, and the driving member is a frameless torque motor coaxially sleeved on the shaft body.

[0009] By adopting the above technical solution, the frameless torque motor can directly drive the shaft body to rotate coaxially without the need for any transmission components, completely eliminating the influence of the transmission components on the rotation of the shaft body and further improving the balance detection accuracy of the rotating body.

[0010] In a specific implementation scheme, a first fixing seat is connected in the cavity, a second fixing seat is sleeved on the shaft body, the stator of the frameless torque motor is connected to the first fixing seat, and the rotor is connected to the second fixing seat.

[0011] By adopting the above technical solution, the shaking of the frameless torque motor during operation is effectively avoided, and the shaking of the frameless torque motor is prevented from affecting the balance detection of the rotating body.

[0012] In a specific possible implementation scheme, the internally driven main shaft also includes a slide groove coaxially arranged in the shaft body and open at both ends, a sliding rod slidable in the slide groove along the extension direction of the slide groove, and a clamping member provided at the end of the slide rod, the clamping member including a plurality of clamping petals circumferentially spaced around the slide rod, and a clearance groove between each two adjacent clamping petals.

[0013] By adopting the above technical solution, the clamping member can be relatively opened or closed during the sliding process of the slide rod to fix the rotating body.

[0014] In a specific feasible implementation scheme, a reset groove is further provided in the shaft body, the reset groove is connected to the slide groove, a pull rod is provided in the reset groove, the pull rod is coaxially connected to the slide rod, a spring is provided on the pull rod, and the two ends of the spring are respectively connected to the shaft body and the pull rod.

[0015] By adopting the above technical solution, the pull rod can be reset under the elastic force of the spring, so that the clamping member can clamp the rotating body.

[0016] In a specific possible implementation scheme, the groove diameter of the reset groove is larger than the groove diameter of the slide groove, and an annular end wall is formed at the connection between the reset groove and the slide groove. The end of the pull rod away from the end wall is provided with a mounting ring, and the two ends of the spring are respectively connected to the end wall and the mounting ring.

[0017] In a specific embodiment, the cavity includes a first chamber and a second chamber arranged along the axial direction of the shaft body, the driving member is accommodated in the first chamber, the second chamber accommodates a bearing, and the bearing is sleeved on the shaft body.

[0018] By adopting the above technical solution, the rotation stability of the shaft body is effectively improved.

[0019] In a specific possible implementation scheme, the cavity also includes a third chamber located on the side of the first chamber away from the second chamber, the third chamber is internally connected to a limiting frame, the limiting frame is provided with a limiting opening, the shaft body is provided with a matching block, the matching block is accommodated in the limiting opening and is gap-matched with the limiting opening.

[0020] By adopting the above technical solution, the rotation stability of the shaft body is further improved, and the deviation of the shaft body during rotation is avoided.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] The driver is built into the housing so that it can drive the shaft body directly inside the spindle, effectively eliminating the lateral pull on the spindle generated by the external motor, while also eliminating the vibration of the belt itself, effectively improving the balance detection accuracy of the rotating body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the internally driven spindle of an embodiment of the present application.

[0024] Figure 2 It is a schematic axial cross-sectional view of the internally driven spindle according to an embodiment of the present application.

[0025] Description of reference numerals:

[0026] 1. Housing; 2. Shaft body; 3. Cavity; 31. First chamber; 32. Second chamber; 33. Third chamber; 4. Driving member; 41. Stator; 42. Rotor; 43. Electric wire; 5. First fixed seat; 6. Second fixed seat; 7. Slide groove; 8. Slide rod; 9. Clamping member; 91. Clamping petal; 92. Yield groove; 10. Reset groove; 11. Pull rod; 12. Spring; 13. End wall; 14. Mounting ring; 15. Bearing; 16. Limit frame; 17. Limit opening; 18. Matching block. DETAILED DESCRIPTION

[0027] The present application is further described in detail below with reference to the accompanying drawings.

[0028] See also Figure 1-2 As shown, an internally driven spindle is shown, which is used in a balancing machine. It includes a hollow shell 1, a shaft body 2 rotatable around its own axis and arranged in the shell 1, the shaft body 2 and the shell 1 are coaxially arranged, and a cavity 3 is formed between the shaft body 2 and the shell 1, and a driving member 4 for driving the shaft body 2 to rotate is accommodated in the cavity 3.

[0029] In this way, the driving member 4 is built into the housing 1, so that the driving member 4 can directly drive the shaft body 2 inside the main shaft, effectively eliminating the lateral tension generated by the external motor on the main shaft, and also eliminating the vibration of the belt itself, effectively improving the balance detection accuracy of the rotating body.

[0030] Of course, in some other embodiments, the internally driven spindle of the present application can also be applied to other equipment that needs to ensure rotational stability.

[0031] In this embodiment, cavity 3 surrounds the circumference of shaft body 2, and driver 4 is a frameless torque motor coaxially mounted on shaft body 2. Wires 43 are connected to the motor, extending through housing 1 and capable of connecting to an external power source. The frameless torque motor directly drives shaft body 2 coaxially, eliminating the need for any transmission components. This eliminates any influence of transmission components on the rotation of shaft body 2, further improving the accuracy of balance detection for the rotating object.

[0032] The frameless torque motor includes an electromagnetically matched stator 41 and a rotor 42 , and its specific driving principle is known from the prior art and will not be described in detail here.

[0033] A first fixing seat 5 is connected to the cavity 3, a second fixing seat 6 is sleeved on the shaft body 2, the stator 41 is connected to the first fixing seat 5, and the rotor 42 is connected to the second fixing seat 6. This prevents the frameless torque motor from shaking during operation, thereby preventing the shaking of the frameless torque motor from affecting the balance detection of the rotating body.

[0034] In this embodiment, the internally driven main shaft also includes a slide groove 7 coaxially arranged in the shaft body 2 and open at both ends, a slide rod 8 slidable in the slide groove 7 along the extension direction of the slide groove 7, and a clamping member 9 provided at the end of the slide rod 8. The clamping member 9 includes a plurality of clamping petals 91 circumferentially spaced around the slide rod 8, and a clearance groove 92 is provided between each two adjacent clamping petals 91.

[0035] Driven by an external cylinder, the slide rod 8 slides forward in the slide groove 7. During the sliding stroke of the slide rod 8, the clamping member 9 can pass through the slide groove 7. The multiple clamping petals 91 open relatively after losing the pressure of the groove wall of the slide groove 7. At this time, the rotating body can be inserted into the multiple clamping petals 91.

[0036] In this embodiment, a reset groove 10 is further provided in the shaft body 2, and the reset groove 10 is connected to the slide groove 7. A pull rod 11 is provided in the reset groove 10, and the pull rod 11 is coaxially connected to the slide rod 8. A spring 12 is sleeved on the pull rod 11, and the two ends of the spring 12 are respectively connected to the shaft body 2 and the pull rod 11. When the slide rod 8 slides forward under the drive of the external cylinder, the spring 12 is compressed; and after the piston rod of the external cylinder retracts, the spring 12 loses its compression force and rebounds. The pull rod 11 is reset under the rebound action of the spring 12 and drives the slide rod 8 to slide in the opposite direction. The clamping member 9 re-enters the slide groove 7, and the multiple clamping petals 91 are relatively closed under the pressure of the groove wall of the slide groove 7 to fix the rotating body.

[0037] Among them, the groove diameter of the reset groove 10 is larger than the groove diameter of the slide groove 7, and an annular end wall 13 is formed at the connection between the reset groove 10 and the slide groove 7. The end of the pull rod 11 away from the end wall 13 is provided with a mounting ring 14, and the two ends of the spring 12 are respectively connected to the end wall 13 and the mounting ring 14.

[0038] In this embodiment, the cavity 3 includes a third chamber 33, a first chamber 31 and a second chamber 32 arranged along the axial direction of the shaft body 2. The driving member 4 is accommodated in the first chamber 31, and the second chamber 32 accommodates a bearing 15, which is sleeved on the shaft body 2. The third chamber 33 is internally connected to a limiting frame 16, and a limiting opening 17 is provided on the limiting frame 16. A matching block 18 is sleeved on the shaft body 2, and the matching block 18 is accommodated in the limiting opening 17 and is clearance-matched with the limiting opening 17.

[0039] The implementation principle of an internally driven spindle in the embodiment of the present application is as follows:

[0040] The slide rod 8 is driven by an external cylinder to slide forward and open the clamping part 9, and then the rotating body is inserted into the clamping part 9. The external cylinder is closed, and the slide rod 8 slides in the opposite direction under the action of the spring 12. The clamping parts are relatively closed and clamp the rotating body. Then the frameless torque motor is started, and the frameless torque motor drives the shaft body 2 to rotate, and then the balance test of the rotating body can be performed.

[0041] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An internal drive spindle, characterized in that: The invention comprises a hollow shell (1), a shaft body (2) rotatable about its own axis and arranged in the shell (1), a cavity (3) formed between the shaft body (2) and the shell (1), and a driving member (4) for driving the shaft body (2) to rotate is accommodated in the cavity (3).

2. The internal drive spindle according to claim 1, characterized in that: The cavity (3) surrounds the circumference of the shaft body (2), and the driving member (4) is a frameless torque motor coaxially sleeved on the shaft body (2).

3. The internal drive spindle according to claim 2, characterized in that: A first fixing seat (5) is connected to the cavity (3), a second fixing seat (6) is sleeved on the shaft body (2), a stator (41) of the frameless torque motor is connected to the first fixing seat (5), and a rotor (42) is connected to the second fixing seat (6).

4. An internal drive spindle according to any one of claims 1 to 3, characterized in that: The internal drive spindle also includes a slide groove (7) coaxially arranged in the shaft body (2) and open at both ends, a slide rod (8) arranged in the slide groove (7) and slidable along the extension direction of the slide groove (7), and a clamping member (9) arranged at the end of the slide rod (8), wherein the clamping member (9) includes a plurality of clamping petals (91) arranged at intervals around the circumference of the slide rod (8), and a clearance groove (92) is provided between each two adjacent clamping petals (91).

5. The internal drive spindle according to claim 4, characterized in that: A reset groove (10) is also provided in the shaft body (2), and the reset groove (10) is communicated with the slide groove (7). A pull rod (11) is provided in the reset groove (10), and the pull rod (11) is coaxially connected to the slide rod (8). A spring (12) is sleeved on the pull rod (11), and the two ends of the spring (12) are respectively connected to the shaft body (2) and the pull rod (11).

6. The internal drive spindle according to claim 5, characterized in that: The groove diameter of the reset groove (10) is larger than the groove diameter of the slide groove (7), and an annular end wall (13) is formed at the connection between the reset groove (10) and the slide groove (7). The end of the pull rod (11) away from the end wall (13) is provided with a mounting ring (14), and the two ends of the spring (12) are respectively connected to the end wall (13) and the mounting ring (14).

7. An internal drive spindle according to any one of claims 1 to 3, characterized in that: The cavity (3) comprises a first chamber (31) and a second chamber (32) arranged along the axial direction of the shaft body (2); the driving member (4) is accommodated in the first chamber (31); a bearing (15) is accommodated in the second chamber (32); and the bearing (15) is sleeved on the shaft body (2).

8. The internal drive spindle according to claim 7, characterized in that: The cavity (3) further comprises a third chamber (33) located on a side of the first chamber (31) away from the second chamber (32); a limiting frame (16) is enclosed in the third chamber (33); a limiting opening (17) is provided on the limiting frame (16); a matching block (18) is sleeved on the shaft body (2); the matching block (18) is accommodated in the limiting opening (17) and is clearance-matched with the limiting opening (17).

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