Non-contact magnetic coupling for roundness measuring instrument

Abstract

The utility model discloses a non-contact magnetic coupling for a roundness measuring instrument, which comprises a first coupling and a second coupling, the second coupling is arranged above the first coupling, a non-contact gap is arranged in the middle of the second coupling, the top end of the first coupling is provided with a first accommodating groove along the circumference, and the first accommodating groove is provided with a second accommodating groove along the circumference. First magnets N and first magnets S are alternately arranged in the multiple first storage grooves in the circumferential direction, second storage grooves are formed in the bottom end of the second coupler in the circumferential direction, and second magnets N and second magnets S are alternately arranged in the multiple second storage grooves in the circumferential direction. The roundness measuring instrument has the advantages of high rotation precision and repeated measurement precision, stable operation, no vibration noise, long service life, extremely low maintenance probability, great reduction of the positioning requirements of the main shaft and the motor, simple motor model selection and low cost.

Description

Technical Field

[0001] The utility model relates to the technical field of non-contact magnetic couplings, and particularly to a non-contact magnetic coupling for a roundness measuring instrument. Background Art

[0002] Due to the very high precision requirements of the spindle of the roundness measuring instrument and the relatively weak rigidity of the air-bearing spindle in general, the traditional coupling drive cannot meet the high-precision requirements of the spindle. After improvement, most of them are belt bag couplings (similar to tire couplings) or fork couplings, but there are still many problems. For example, the belt bag coupling has an empty stroke, cannot run smoothly at low speeds, and has a limited service life. The fork coupling can transmit a relatively large torque radially and has a very small empty stroke. However, due to the very weak radial and axial stiffness of the air spindle, it is required that the coupling cannot be subjected to any torsion and vibration. Therefore, the machining of the coupling and the positioning accuracy of the motor and the spindle are required to be very high, and the motor vibration is required to be very small. This patent adopts a principle similar to that of a planar coupling, and adjusts the layout of the NS magnets through a non-contact installation method to achieve effective torque transfer by magnetic coupling, and solves problems such as empty stroke, high requirements for machining and installation errors, and the influence of motor vibration transmission on the spindle accuracy. Content of the Utility Model

[0003] In order to overcome the deficiencies of the prior art, one of the purposes of the present utility model is to provide a non-contact magnetic coupling for a roundness measuring instrument. By providing the first magnet N3, the first magnet S4, the second magnet N5, and the second magnet S6, the roundness measuring instrument obtains very high rotational accuracy and repeated measurement accuracy, operates smoothly without vibration and noise, has a long service life and a very low maintenance probability, greatly reduces the positioning requirements of the spindle and the motor, simplifies the motor selection and reduces the cost.

[0004] One of the purposes of the present utility model is achieved by adopting the following technical solution: A non-contact magnetic coupling for a roundness measuring instrument, comprising: a coupling one and a coupling two. The coupling two is located above the coupling one, and there is a non-contact gap in between. A receiving groove one is arranged along the circumference at the top end of the coupling one, and a first magnet N and a first magnet S are alternately arranged along the circumference in a plurality of the receiving grooves one. A receiving groove two is arranged along the circumference at the bottom end of the coupling two, and a second magnet N and a second magnet S are alternately arranged along the circumference in a plurality of the receiving grooves two. The roundness measuring instrument obtains very high rotational accuracy and repeated measurement accuracy, operates smoothly without vibration and noise, has a long service life and a very low maintenance probability, greatly reduces the positioning requirements of the spindle and the motor, simplifies the motor selection and reduces the cost.

[0005] According to the non-contact magnetic coupling for a roundness measuring instrument, the position of the first magnet N corresponds to the position of the second magnet S.

[0006] According to the non-contact magnetic coupling for a roundness measuring instrument described above, the position of the first magnet S corresponds to the position of the second magnet N.

[0007] Provide the non-contact magnetic coupling for a roundness measuring instrument described above. The materials of the coupling one and the coupling two are non-magnetic materials such as copper, aluminum or stainless steel.

[0008] According to the non-contact magnetic coupling for a roundness measuring instrument described above, the first magnet N, the first magnet S, the second magnet N, and the second magnet S are all permanent magnets, and the permanent magnets are magnetized axially.

[0009] Additional aspects and advantages of the present utility model will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0010] The present utility model will be further described below in conjunction with the drawings and embodiments;

[0011] Figure 1 is a perspective view of a non-contact magnetic coupling for a roundness measuring instrument of the present utility model;

[0012] Figure 2 is a structural schematic diagram of a non-contact magnetic coupling for a roundness measuring instrument of the present utility model;

[0013] Figure 3 is a sectional view of a non-contact magnetic coupling for a roundness measuring instrument of the present utility model;

[0014] Figure 4 is an enlarged view of part A of a non-contact magnetic coupling for a roundness measuring instrument of the present utility model.

[0015] Legend Explanation:

[0016] 1. Coupling one; 2. Coupling two; 3. First magnet N; 4. First magnet S; 5. Second magnet N; 6. Second magnet S; 7. Non-contact gap; 101. Receiving groove one; 201. Receiving groove two. Detailed Embodiment

[0017] This part will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the drawings. The role of the drawings is to supplement the description of the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but it cannot be understood as a limitation on the protection scope of the present utility model.

[0018] Refer to Figures 1-4, an embodiment of the utility model provides a non-contact magnetic coupling for a roundness measuring instrument, which comprises: coupling one 1 and coupling two 2. The materials of coupling one 1 and coupling two 2 are non-magnetic materials such as copper, aluminum or stainless steel. Coupling two 2 is located above coupling one 1, and there is a non-contact gap 7 in between. The top end of coupling one 1 is provided with receiving grooves one 101 arranged in a circumferential array. In several receiving grooves one 101, first magnets N 3 and first magnets S 4 are alternately arranged in a circumferential array. The bottom end of coupling two 2 is provided with receiving grooves two 201 arranged in a circumferential array. In several receiving grooves two 201, second magnets N 5 and second magnets S 6 are alternately arranged in a circumferential array. The position of first magnet N 3 corresponds to the position of second magnet S 6, and the position of first magnet S 4 corresponds to the position of second magnet N 5. First magnet N 3, first magnet S 4, second magnet N 5 and second magnet S 6 are all permanent magnets, and the permanent magnets are axially magnetized. Through the arranged first magnet N 3, first magnet S 4, second magnet N 5 and second magnet S 6, after the coupling is installed, first magnet N 3 corresponds to second magnet N 5 and first magnet S 4 corresponds to second magnet S 6 to form magnetic lines of force. When the motor end rotates, a thrust is generated between adjacent N / S magnets with different polarities, thereby driving the spindle end to rotate to achieve non-contact transmission. The non-contact feature of eliminating vibration can achieve the optimal accuracy of the spindle. Moreover, the permanent magnets have a long service life and are maintenance-free, which is the same as that of an air spindle. It is the best transmission method for a high-precision roundness instrument, enabling the roundness measuring instrument to obtain high rotational accuracy and repeated measurement accuracy, running smoothly without vibration and noise, having a long service life and a very low maintenance probability, greatly reducing the positioning requirements for the spindle and the motor, simplifying the motor selection and reducing the cost.

[0019] Working principle: When in use, connect coupling one 1 and coupling two 2 to the motor. Then, first magnet N 3 corresponds to second magnet N 5 and first magnet S 4 corresponds to second magnet S 6 to form magnetic lines of force. When the motor end rotates, a thrust is generated between adjacent N / S magnets with different polarities, thereby driving the spindle end to rotate to achieve non-contact transmission. The non-contact feature of eliminating vibration can achieve the optimal accuracy of the spindle. Moreover, the permanent magnets have a long service life and are maintenance-free, which is the same as that of an air spindle. It is the best transmission method for a high-precision roundness instrument, enabling the roundness measuring instrument to obtain high rotational accuracy and repeated measurement accuracy, running smoothly without vibration and noise, having a long service life and a very low maintenance probability, greatly reducing the positioning requirements for the spindle and the motor, simplifying the motor selection and reducing the cost.

[0020] The above has described the embodiments of the utility model in detail with reference to the drawings. However, the utility model is not limited to the above embodiments. Within the knowledge scope of those of ordinary skill in the art to which the utility model pertains, various changes can be made without departing from the gist of the utility model.

Claims

1. A non-contact magnetic coupling for a roundness measuring instrument, comprising: Coupling one (1), coupling two (2), characterized in that the coupling two (2) is located above the coupling one (1), and there is a non-contact gap (7) in between. The top end of the coupling one (1) is provided with a first receiving groove (101) arranged in a circumferential array. A number of the first receiving grooves (101) are alternately arranged with first magnet N (3) and first magnet S (4) along the circumference. The bottom end of the coupling two (2) is provided with a second receiving groove (201) arranged in a circumferential array. A number of the second receiving grooves (201) are alternately arranged with second magnet N (5) and second magnet S (6) along the circumference.

2. The non-contact magnetic coupling for a roundness measuring instrument according to claim 1, characterized in that, The position of the first magnet N (3) corresponds to the position of the second magnet S (6).

3. The non-contact magnetic coupling for a roundness measuring instrument according to claim 1, characterized in that, The position of the first magnet S (4) corresponds to the position of the second magnet N (5).

4. The non-contact magnetic coupling for a roundness measuring instrument according to claim 1, characterized in that The materials of the coupling one (1) and the coupling two (2) are non-magnetic materials such as copper, aluminum or stainless steel.

5. The non-contact magnetic coupling for a roundness measuring instrument according to claim 1, wherein, The first magnet N (3), the first magnet S (4), the second magnet N (5) and the second magnet S (6) are all permanent magnets, and the permanent magnets are axially magnetized.

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