Clamp for motor base

Abstract

A clamp (12) for a motor base (10) includes a centering assembly (14) and a retaining assembly (16). The centring assembly (14) comprises a centring element (20) provided with a centring mating portion (18), the centring element (20) being configured to be movable in an axial direction (A) for switching between a first position and a second position. When the centering element (20) is in the first position, the centering matching part (18) is matched with a seam allowance on the inner circumferential surface of the motor base (10), and when the centering element (20) is in the second position, the centering matching part (18) is withdrawn to the outer side of the motor base (10) in the axial direction (A). The retaining assembly (16) is disposed outside the motor base (10) and is configured to engage the motor base (10) when the centering element (20) is in the first position to retain the position of the motor base (10) after the centering element (20) is switched from the first position to the second position.

Description

Technical Field

[0001] The present disclosure belongs to the field of mechanical processing technology, and particularly relates to a clamp for a motor base. Background Art

[0002] The motor frame (hereafter referred to as the frame) supports the stator core and windings. The machining accuracy of the frame can affect the motor's performance, so it's crucial to ensure that the frame meets geometric and positional tolerance requirements.

[0003] Existing machine bases usually require two processing steps: using the inner hole of the machine base as the positioning reference, after tightening the machine base with a three-jaw chuck, the stopper at one end of the machine base is precision-turned; using the processed stopper at one end as the reference, using a tool to match the clearance with the stopper at one end and pressing the machine base with a pressure plate, the inner hole of the machine base and the stopper at the other end are precision-turned.

[0004] However, during the aforementioned machining process, if the incoming material is out of round, the three-jaw chuck may exacerbate its deformation, resulting in large runout errors in the machine base. Furthermore, due to the clearance fit between the fixture and the stopper on one end of the machine base, coaxiality between the fixture and the stopper is difficult to ensure, resulting in large coaxiality errors in the machine base. Furthermore, the aforementioned two processes require two separate clamping operations on two different machine tools, resulting in low production efficiency for the machine base. Utility Model Content

[0005] To solve the above technical problems, the present disclosure provides a clamp for a motor base, comprising: a centering assembly, the centering assembly including a centering element provided with a centering fitting portion, the centering element being configured to be movable in an axial direction to switch between a first position and a second position, wherein when the centering element is in the first position, the centering fitting portion is engaged with a stop on an inner circumferential surface of the motor base, and when the centering element is in the second position, the centering fitting portion is withdrawn to the outside of the motor base along the axial direction; and a retaining assembly, the retaining assembly being arranged on the outside of the motor base and being configured to engage with the motor base when the centering element is in the first position, so as to maintain the position of the motor base after the centering element is switched from the first position to the second position.

[0006] In the present disclosure, by providing a centering assembly and a retaining assembly, the centering assembly can be withdrawn from the inner side of the motor base after the motor base is centered, allowing the entire inner circumference of the motor base, including the stop, to be machined together, eliminating the need for multiple clamping of the motor base. In this way, the fixture can improve the coaxiality error and production efficiency of the motor base. Furthermore, compared to the prior art, by providing a centering assembly and a retaining assembly, the fixture does not need to clamp the motor base in a tensioning manner, resulting in less deformation of the motor base caused by clamping. In this way, the fixture can improve the runout error of the motor base.

[0007] Further, the plurality of centering fitting portions having the same curvature are spaced apart in the circumferential direction.

[0008] In the present disclosure, by spacing multiple centering fitting portions having the same curvature in the circumferential direction, the centering element can be easily fitted to the motor base, making the clamp easy to use. This configuration is particularly advantageous for motor bases that are severely out of round.

[0009] Further, a plurality of centering fitting portions with different curvatures are coaxially arranged.

[0010] In the present disclosure, by providing multiple centering fitting portions with different curvatures, one centering element can be adapted to motor bases of various sizes, thereby reducing the frequency of disassembly of the entire or partial fixture, thereby improving the production efficiency of the motor base.

[0011] Furthermore, the centering assembly also includes an actuator, which is used to drive the centering element to move in the axial direction; the centering element includes a centering block and a centering disk, the centering block is provided with the centering fitting portion and is detachably connected to the centering disk; the actuator is connected to the centering block via the centering disk.

[0012] In the present disclosure, by providing a detachable centering block, the centering element can be adapted to motor frames of different sizes by replacing the centering block, while the rest of the centering assembly can remain unchanged or only undergo minor modifications, making the clamp easy to use.

[0013] Furthermore, a drainage groove is provided on the upper surface of the centering element facing the motor base. The drainage groove extends in a radial direction and is formed with a port facing radially outward.

[0014] In the present disclosure, a drain trough is provided to collect, for example, cutting fluid and chips, and to discharge them through a port. This prevents the cutting fluid and chips from accumulating on the centering element and affecting the fit between the motor base and the centering element. Furthermore, in a configuration where the centering element rotates with the motor base, the cutting fluid and chips in the drain trough can be removed by centrifugal force, thereby efficiently removing the cutting fluid and chips.

[0015] Furthermore, the centering assembly also includes a detection element arranged below the centering element, and the detection element is provided with a detection hole for spraying air flow toward the centering element; the centering element is configured to be separated from the detection element in the first position and cover the detection hole in the second position.

[0016] In the present disclosure, a detection element is provided that can provide feedback on the position of the centering element based on the flow state of the airflow, thereby ensuring that the centering element can be moved into position. Furthermore, the airflow ejected from the detection hole can be rebounded by the centering element onto the surface of the detection element, allowing the airflow to remove, for example, cutting fluid and chips from the detection element, thereby preventing the cutting fluid and chips from affecting the movement of the centering element.

[0017] Furthermore, the retaining assembly includes a pair of clamping arms, each of which is provided with a pressing portion for engaging with a convex portion on the outer peripheral surface of the motor base. The pair of pressing portions are configured to be located on opposite sides of the convex portion in a clamping state, so as to jointly clamp the convex portion through a pair of forces acting in opposite directions.

[0018] In the present disclosure, by setting a pair of clamping arms, the protrusion can be subjected to two forces directed toward each other, so that the deformation of the motor base is small, and the motor base is not easy to lose roundness when engaged with the retaining assembly, thereby improving the runout error of the motor base.

[0019] Furthermore, the pair of pressing portions are configured to be arranged opposite to each other in the axial direction in a clamped state; and at least one of the pressing portions is configured to be movable in the radial direction so as to avoid the motor base when the motor base is placed on the centering element.

[0020] In the present disclosure, by enabling the pressing portion to move in the radial direction, the pressing portion can avoid the motor base, preventing interference or even collision with the motor base, thereby reducing damage to the motor base and the clamp. Furthermore, when the axial direction is parallel to the vertical direction, by arranging the pair of pressing portions opposite each other in the axial direction, one of the pressing portions can support the protrusion from below, allowing the retaining assembly to reliably engage with the protrusion using gravity.

[0021] Further, at least one of the clamping arms includes a main body and a pressing head detachably connected to the main body, and the pressing head is provided with the pressing portion.

[0022] In the present disclosure, by providing a detachable pressing head, the clamp arm can be matched with protrusions of different positions, sizes or shapes by replacing the pressing head, while the rest of the retaining assembly can remain unchanged or only undergo minor modifications, making the clamp easy to use.

[0023] Furthermore, at least one of the clamping arms includes a joint bearing, which supports the pressing portion, so that the pressing portion can swing under the support of the joint bearing, so that the pressing portion can engage with the protrusion at an adaptive angle.

[0024] In the present disclosure, by providing a spherical bearing, the clamp allows the protrusion to have a variety of different sizes or be positioned in different positions, making the clamp adaptable to a variety of motor bases without changing the configuration, thereby making the clamp easy to use. Furthermore, by providing a spherical bearing, the protrusion can have larger geometric and positional tolerances, thereby reducing the production cost of the motor base.

[0025] Furthermore, the retaining assembly also includes: a driving element, which is used to apply a clamping force to the clamping arm; and a supporting element, which is used to support the clamping arm, wherein the driving element and the supporting element define the power arm of the clamping arm, and the protrusion and the supporting element define the resistance arm of the clamping arm.

[0026] In the present disclosure, by setting the clamp arm as a lever, the pressing part and the driving element can be staggered in the radial direction, so that the driving element and other components will not interfere with the motor base and the centering assembly, so that the clamp can achieve a reasonable layout with a simple structure.

[0027] Further, the driving element includes a first driving element and a second driving element, and the retaining assembly also includes an elastic element, wherein the elastic element is connected to the first clamp arm of the pair of clamp arms, and is used to apply force to the first clamp arm through elastic deformation so that the first clamp arm is elastically maintained in an engagement position in which the pressing portion of the first clamp arm is engaged with the protrusion, wherein the first driving element is configured to move toward the first clamp arm after the first clamp arm is elastically maintained in the engagement position, so that the first clamp arm is rigidly maintained in the engagement position, and wherein the second driving element is configured to apply force to the second clamp arm of the pair of clamp arms after the first clamp arm is rigidly maintained in the engagement position, so that the pressing portion of the first clamp arm and the pressing portion of the second clamp arm apply a clamping force to the protrusion relative to each other.

[0028] In the present disclosure, an elastic element is provided, which can eliminate the gap between the pressing portion and the protrusion when the centering element is in the first position (i.e., before being withdrawn from the inner side of the motor base), thereby preventing the position of the motor base from shifting after the centering element leaves the first position. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present disclosure. The exemplary embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the drawings:

[0030] Figure 1 is a perspective view of a fixture for a motor base and a motor base loaded into the fixture, wherein a centering element is in a first position, retaining the assembly engaged to the motor base;

[0031] Figure 2 yes Figure 1 A top view of the fixture and motor base is shown;

[0032] Figure 3 yes Figure 1 A perspective view of the clamp shown, with part of the pressing head omitted;

[0033] Figure 4 yes Figure 1 A top view of the clamp is shown with part of the pressing head omitted.

[0034] Description of Figure Numbers:

[0035] 10. Motor base;

[0036] 12. Clamp;

[0037] 14. Centering assembly;

[0038] 16. Maintain components;

[0039] 18. Centering and matching part;

[0040] 18a, first centering fitting portion;

[0041] 18b, second centering fitting portion;

[0042] 20. Centering element;

[0043] 22. Centering block;

[0044] 24. Centering plate;

[0045] 26. Upper surface;

[0046] 28. Clamp arm;

[0047] 28a, first clamping arm;

[0048] 28b, second clamping arm;

[0049] 30. Convex part;

[0050] 32. Pressing part;

[0051] 33a, guide rail;

[0052] 33b, slider;

[0053] 33c, guide hole;

[0054] 34. Subject;

[0055] 36. Press head;

[0056] 38. Driving element;

[0057] 38a, a first driving element;

[0058] 38b, second driving element;

[0059] 39. Transmission rod;

[0060] 40. Support element;

[0061] 40a, first supporting element;

[0062] 40b, second supporting element;

[0063] A. Axial direction;

[0064] C. Circumferential direction. DETAILED DESCRIPTION

[0065] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0066] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form.

[0067] Refer to the following Figures 1 to 4 An embodiment of the present disclosure is introduced.

[0068] Figure 1 The present invention is a perspective view of a clamp for a motor frame and a motor frame loaded into the clamp, wherein a centering element is in a first position, retaining an assembly engaged to the motor frame. Figure 2 yes Figure 1 Top view of the fixture and motor frame shown. Figure 3 yes Figure 1 A perspective view of the clamp is shown with part of the pressing head omitted. Figure 4 yes Figure 1 A top view of the clamp is shown with part of the pressing head omitted.

[0069] Reference Figures 1 to 4 The present disclosure provides a clamp 12 for a motor base 10, comprising a centering assembly 14 and a retaining assembly 16. The centering assembly 14 comprises a centering element 20 provided with a centering fitting portion 18, the centering element 20 being configured to be movable in an axial direction A to switch between a first position and a second position. When the centering element 20 is in the first position, the centering fitting portion 18 engages with a stop on an inner circumferential surface of the motor base 10, and when the centering element 20 is in the second position, the centering fitting portion 18 withdraws to the outside of the motor base 10 along the axial direction A. The retaining assembly 16 is disposed on the outside of the motor base 10 and is configured to engage with the motor base 10 when the centering element 20 is in the first position, so as to maintain the position of the motor base 10 after the centering element 20 switches from the first position to the second position.

[0070] In this disclosure, the motor base 10 is a tubular member open at both ends. Unless the context clearly indicates otherwise, the axial direction A refers to the axial direction of the motor base 10, the radial direction refers to the radial direction of the motor base 10, and the circumferential direction C refers to the circumferential direction of the motor base 10. It should be understood that the motor base 10 described in this disclosure refers to the motor base being clamped to the fixture 12 or having been clamped to the fixture 12.

[0071] As an example, the centering fitting portion 18 may be a stopper on the outer circumferential surface of the centering element 20. In other words, the centering fitting portion 18 may be what is commonly known as an inner stopper (a stopper located radially inward when mated), while the stopper on the inner circumferential surface of the motor base 10 may be what is commonly known as an outer stopper (a stopper located radially outward when mated).

[0072] As an example, the axial direction A can be parallel to the vertical direction. The centering element 20 can be disposed below the motor base 10 , with the first position being an upper position in the axial direction A and the second position being a lower position in the axial direction A. In other words, when the centering element 20 is switched from the first position to the second position, the centering engagement portion 18 can exit the inner side of the motor base 10 through the lower end opening of the motor base 10 .

[0073] As an example, the motor frame 10 can be clamped to the clamp 12 in the following steps: positioning the centering element 20 in a first position; fitting the stop on the inner circumference of the motor frame 10 to the centering fitting portion 18; engaging the retaining assembly 16 to the motor frame 10; and switching the centering element 20 from the first position to the second position.

[0074] As an example, the plurality of retaining assemblies 16 may be arranged side by side in the circumferential direction C, for example, at least two retaining assemblies 16 among the plurality of retaining assemblies 16 may be arranged opposite to each other in the radial direction.

[0075] In the present disclosure, by providing a centering assembly 14 and a retaining assembly 16, the centering assembly 14 can be withdrawn from the inner side of the motor base 10 after the motor base 10 is centered, so that the entire inner circumference of the motor base 10 including the stop can be processed together, thereby eliminating the need to clamp the motor base 10 multiple times. In this way, the fixture 12 can improve the coaxiality error and production efficiency of the motor base 10. In addition, compared with the prior art, by providing the centering assembly 14 and the retaining assembly 16, the fixture 12 does not need to clamp the motor base 10 in a tensioning manner, so that the deformation of the motor base 10 caused by clamping is smaller. In this way, the fixture 12 can improve the runout error of the motor base 10.

[0076] Reference Figure 3 and Figure 4 , the plurality of centering fitting portions 18 having the same curvature are spaced apart in the circumferential direction C. As an example, each of the plurality of centering fitting portions 18 having the same curvature extends at an angle less than or equal to 30° in the circumferential direction C. As an example, the plurality of centering fitting portions 18 having the same curvature are evenly spaced apart in the circumferential direction C. As an example, the number of centering fitting portions 18 having the same curvature can be three to eight, for example, four to six, and preferably four.

[0077] As an example, at least two of the plurality of centering fittings 18 having the same curvature may be arranged opposite each other in a radial direction. For example, two of the four centering fittings 18 may be arranged opposite each other in a first radial direction, while another two of the four centering fittings 18 may be arranged opposite each other in a second radial direction orthogonal to the first radial direction. This facilitates measurement of the dimensions defined by the centering fittings 18.

[0078] As an example, at least one centering fitting portion 18 and at least one retaining assembly 16 among the plurality of centering fitting portions 18 having the same curvature may overlap in the circumferential direction C, that is, they may be located at approximately the same position in the circumferential direction C. For example, each centering fitting portion 18 among the plurality of centering fitting portions 18 having the same curvature may correspond to one retaining assembly 16 .

[0079] In the present disclosure, by spacing the plurality of centering fitting portions 18 having the same curvature in the circumferential direction C, the centering element 20 can be easily fitted to the motor frame 10, making the clamp 12 easy to use. This configuration is particularly advantageous for motor frames 10 that are severely out of round.

[0080] It should be understood that the centering portion 18 is not limited to extending over a non-circumferential portion. For example, in other embodiments, the centering portion 18 may also extend over a full circumference, that is, extend over 360° in the circumferential direction C.

[0081] Reference Figure 3 and Figure 4 , a plurality of centering fitting portions 18 with different curvatures are coaxially arranged. As an example, the plurality of centering fitting portions 18 with different curvatures may be staggered in the axial direction A. For example, the centering element 20 may include a first centering fitting portion 18a having a first curvature radius and a second centering fitting portion 18b having a second curvature radius, wherein the first curvature radius is smaller than the second curvature radius, and the first centering fitting portion 18a is arranged on a side of the second centering fitting portion 18b facing the motor base 10 in the axial direction A ( Figure 3 (upper side in the middle).

[0082] It should be understood that the centering fitting portions 18 with different curvatures are not limited to two groups, and may be three or more groups, for example. Of course, in other embodiments, the centering element 20 may also include only a centering fitting portion 18 with a single curvature.

[0083] In the present disclosure, by providing multiple centering fitting portions 18 with different curvatures, one centering element 20 can be adapted to motor bases 10 of various sizes, thereby reducing the frequency of disassembly of the entire or partial clamp 12 and improving the production efficiency of the motor base 10.

[0084] Reference Figures 2 to 4 The centering assembly 14 further includes an actuator for driving the centering element 20 to move in the axial direction A. The centering element 20 includes a centering block 22 and a centering disc 24. The centering block 22 is provided with a centering fitting portion 18 and is detachably connected to the centering disc 24. The actuator is connected to the centering block 22 via the centering disc 24.

[0085] As an example, the actuator (hidden by the centering element 20 in the figure) can be a hydraulic drive and is arranged below the centering element 20. As an example, the plurality of centering blocks 22 can be spaced apart in the circumferential direction C. As an example, at least one centering block 22 can be provided with a plurality of centering fitting portions 18 having different curvatures, for example, each of the plurality of centering blocks 22 can be provided with the first centering fitting portion 18a and the second centering fitting portion 18b described above.

[0086] Of course, it should be understood that the centering block 22 is not necessary. In other embodiments, the centering element 20 can be a one-piece piece that cannot be further disassembled. For example, the centering fitting portion 18 can be formed on the body of the centering element 20 by integral molding.

[0087] In the present disclosure, by providing a detachable centering block 22, the centering element 20 can be adapted to motor frames 10 of different sizes by replacing the centering block 22, while the rest of the centering assembly 14 can remain unchanged or only undergo minor modifications, making the clamp 12 easy to use.

[0088] Reference Figures 2 to 4 The upper surface 26 of the centering element 20 facing the motor base 10 is provided with a drainage groove (not shown). The drainage groove extends in the radial direction and is formed with a port facing radially outward. As an example, a plurality of drainage grooves can be spaced apart in the circumferential direction C. For example, the drainage grooves and the centering blocks 22 can be arranged alternately in the circumferential direction C. As an example, the drainage grooves can be provided on the centering disk 24, and the ports of the drainage grooves can be provided on the outer circumferential surface of the centering disk 24.

[0089] In the present disclosure, by providing a drainage trough, the drainage trough can collect, for example, cutting fluid and chips, and discharge the cutting fluid and chips through the port, thereby preventing the cutting fluid and chips from accumulating on the centering element 20 and affecting the fit between the motor base 10 and the centering element 20. In addition, in a configuration in which the centering element 20 can rotate with the motor base 10, the cutting fluid and chips in the drainage trough can be discharged from the drainage trough by centrifugal force, thereby efficiently removing the cutting fluid and chips.

[0090] Reference Figure 1 and Figure 3 The centering assembly 14 further includes a detection element disposed below the centering element 20 (obscured by the centering element 20 in the figure), the detection element being provided with a detection hole for injecting an airflow toward the centering element 20. The centering element 20 is configured to be separated from the detection element in a first position and to cover the detection hole in a second position.

[0091] In other words, when the centering element 20 is in the first position, the airflow can smoothly exit the detection hole, resulting in a first flow state. When the centering element 20 is in the second position, the centering element 20 blocks the airflow from exiting the detection hole, resulting in a second flow state different from the first flow state. By way of example, the flow state of the airflow can be its flow rate. It should be understood that the flow state of the airflow is not limited to its flow rate, but can be other parameters of the airflow. For example, in other embodiments, the flow state of the airflow can be its pressure.

[0092] As an example, the centering assembly 14 may include a plurality of detection elements. For example, the plurality of detection elements may be arranged side by side in the circumferential direction C.

[0093] In the present disclosure, by providing a detection element, the detection element can provide feedback on the position of the centering element 20 based on the flow state of the airflow, thereby ensuring that the centering element 20 can be moved into position. In addition, the airflow ejected from the detection hole can be rebounded by the centering element 20 onto the surface of the detection element, so that, for example, cutting fluid and chips on the detection element are removed by the airflow, thereby preventing the cutting fluid and chips from affecting the movement of the centering element 20.

[0094] Reference Figures 1 to 4 The retaining assembly 16 includes a pair of clamping arms 28, each of which is provided with a pressing portion 32 for engaging with a protrusion 30 on the outer peripheral surface of the motor base 10. The pair of pressing portions 32 are configured to be located on opposite sides of the protrusion 30 in the clamping state, so as to clamp the protrusion 30 together through a pair of mutually opposing forces.

[0095] As an example, the pair of clamp arms 28 may include a first clamp arm 28a and a second clamp arm 28b. The first clamp arm 28a and the second clamp arm 28b may have different configurations, such as different shapes and / or sizes. Of course, in other embodiments, the first clamp arm 28a and the second clamp arm 28b may have the same configuration. As an example, the length direction of the clamp arm 28 may be orthogonal to the axial direction A, and the pressing portion 32 may be positioned at an end of the length direction of the clamp arm 28. For example, the length direction of the first clamp arm 28a and the length direction of the second clamp arm 28b may be arranged at an angle (non-parallel).

[0096] As an example, the protrusion 30 can be a lifting ring or a foot on the motor frame 10. As an example, the motor frame 10 can include a plurality of protrusions 30, each of which can be engaged by one of the retaining assemblies 16.

[0097] In the present disclosure, by providing a pair of clamping arms 28, the protrusion 30 can be subjected to two forces directed toward each other, so that the deformation of the motor base 10 is small, and the motor base 10 is not easy to lose roundness when engaged with the retaining assembly 16, thereby improving the runout error of the motor base 10.

[0098] Reference Figures 1 to 4 The pair of pressing portions 32 are configured to be oppositely arranged in the axial direction A in a clamped state. At least one pressing portion 32 is configured to be movable in the radial direction so as to avoid the motor base 10 when the motor base 10 is placed on the centering element 20 .

[0099] As an example, in a case where the axial direction A is parallel to the vertical direction, the first clamping arm 28 a may be disposed at a lower position, and the second clamping arm 28 b may be disposed at an upper position.

[0100] As an example, the holding assembly 16 may further include a guide rail 33a extending in a radial direction, and the first clamp arm 28a may be mounted on a slider 33b that cooperates with the guide rail 33a. Further, the holding assembly 16 may further include a locking element configured to lock the slider 33b on the guide rail 33a.

[0101] As an example, the second clamping arm 28b may be provided with a guide hole 33c, which may be an oblong hole extending in the longitudinal direction of the second clamping arm 28b. The guide hole 33c may cooperate with a vertically arranged stud to provide a guide, thereby allowing the second clamping arm 28b to move radially under the guidance of the guide hole 33c.

[0102] It should be understood that the first clamp arm 28a is not limited to being guided by the guide rail 33a, and the second clamp arm 28b is not limited to being guided by the guide hole 33c. For example, in other embodiments, the first clamp arm 28a can be guided by the guide hole, and the second clamp arm 28b can be guided by the guide rail.

[0103] In the present disclosure, by enabling radial movement of the pressing portion 32, the pressing portion 32 can avoid the motor base 10, thereby preventing interference or even collision between the pressing portion 32 and the motor base 10. This prevents damage to the motor base 10 and the clamp 12. Furthermore, when the axial direction A is parallel to the vertical direction, by arranging the pair of pressing portions 32 opposite each other in the axial direction A, one of the pressing portions 32 can support the protrusion 30 from below, allowing the retaining assembly 16 to reliably engage with the protrusion 30 by virtue of gravity.

[0104] Reference Figure 3 and Figure 4 At least one clamp arm 28 includes a main body 34 and a pressing head 36 detachably connected to the main body 34, with the pressing head 36 having a pressing portion 32. For example, the first clamp arm 28a may include the main body 34 and the pressing head 36, while the second clamp arm 28b may be a single, integrally formed part. For example, the pressing head 36 may be mounted at an end of the main body 34 in its longitudinal direction.

[0105] It should be understood that the second clamping arm 28b is not limited to being a single part. In other embodiments, the second clamping arm 28b may also include a main body and a pressing head.

[0106] In the present disclosure, by providing a detachable pressing head 36, the clamp arm 28 can be matched with the protrusion 30 of different position, size or shape by replacing the pressing head 36, while the rest of the retaining assembly 16 can remain unchanged or only undergo minor modifications, making the clamp 12 easy to use.

[0107] Reference Figures 1 to 4 At least one clamp arm 28 includes a joint bearing. The joint bearing supports the pressing portion 32, allowing the pressing portion 32 to swing under the support of the joint bearing, thereby enabling the pressing portion 32 to engage with the protrusion 30 at an adaptive angle. As an example, the joint bearing can be disposed inside the pressing head 36 and can be replaced together with the pressing head 36.

[0108] In the present disclosure, by providing the spherical bearing, the clamp 12 allows the protrusion 30 to have a variety of different sizes or be arranged in different positions, making the clamp 12 suitable for a variety of motor bases 10 with different specifications without changing the configuration, thereby making the clamp 12 easy to use. Furthermore, by providing the spherical bearing, the protrusion 30 can have larger geometric and positional tolerances, thereby reducing the production cost of the motor base 10.

[0109] Reference Figures 1 to 4 The retaining assembly 16 further includes a drive element 38 and a support element 40. The drive element 38 is used to apply a clamping force to the clamp arm 28. The support element 40 is used to support the clamp arm 28. The drive element 38 and the support element 40 define a power arm of the clamp arm 28, and the protrusion 30 and the support element 40 define a resistance arm of the clamp arm 28. In other words, the clamp arm 28 can be configured as a lever.

[0110] As an example, the retaining assembly 16 may include a first drive element 38a and a first support element 40a. The first clamping arm 28a may be configured as a first-class lever (a lever with a fulcrum between a power point and a resistance point). The first drive element 38a and the first support element 40a may define a power arm of the first clamping arm 28a, and the protrusion 30 and the first support element 40a may define a resistance arm of the first clamping arm 28a. For example, the first drive element 38a may be connected to a hydraulic actuator and configured to apply a downward force to the end of the first clamping arm 28a opposite the pressing portion 32, and the first support element 40a may support the body 34 for rotation at the middle portion of the first clamping arm 28a.

[0111] As an example, the retaining assembly 16 may include a second drive element 38b and a second support element 40b. The second clamping arm 28b may be configured as a third-class lever (a lever with a power point between a fulcrum and a resistance point). The second drive element 38b and the second support element 40b may define a power arm of the second clamping arm 28b, and the protrusion 30 and the second support element 40b may define a resistance arm of the second clamping arm 28b. For example, the second drive element 38b may be connected to a hydraulic actuator and configured to apply a downward force to a middle portion of the second clamping arm 28b, and the second support element 40b may abut against an end of the second clamping arm 28b opposite the pressing portion 32 from below.

[0112] As an example, the second drive element 38b may be screwed to a transmission rod 39 inserted into the guide hole 33c and connected to the hydraulic actuator via the transmission rod 39. For example, the second drive element 38b may be provided with an internal thread, the transmission rod 39 may be provided with an external thread, and the second drive element 38b may be rotated to move in the axial direction of the transmission rod 39. The second drive element 38b may be detachable from the transmission rod 39, thereby allowing the second clamp arm 28b to be removed from or attached to the transmission rod 39.

[0113] In the present disclosure, by setting the clamping arm 28 as a lever, the pressing portion 32 and the driving element 38 can be staggered in the radial direction, so that components such as the driving element 38 will not interfere with the motor base 10 and the centering assembly 14, so that the clamp 12 can achieve a reasonable layout with a simple structure.

[0114] Reference Figures 1 to 4 The retaining assembly 16 further includes an elastic element. The elastic element is connected to the first clamping arm 28a and is configured to elastically deform to apply force to the first clamping arm 28a so that the first clamping arm 28a is elastically retained in the engaged position, where the pressing portion 32 of the first clamping arm 28a is engaged with the protrusion 30. The first driving element 38a is configured to move toward the first clamping arm 28a after the first clamping arm 28a is elastically retained in the engaged position, so that the first clamping arm 28a is rigidly retained in the engaged position. The second driving element 38b is configured to apply force to the second clamping arm 28b after the first clamping arm 28a is rigidly retained in the engaged position, so that the pressing portion 32 of the first clamping arm 28a and the pressing portion 32 of the second clamping arm 28b apply a clamping force to the protrusion 30 relative to each other.

[0115] As an example, the elastic element may be a spring, such as a coil spring. As an example, the elastic element may apply a substantially downward elastic force to the end of the first clamping arm 28 a opposite to the pressing portion 32 .

[0116] For example, when the first actuating element 38a rigidly holds the first clamp arm 28a in the engaged position and before the second actuating element 38b applies force to the second clamp arm 28b, the first actuating element 38a may apply little or no force to the first clamp arm 28a. For example, the stroke of the first actuating element 38a may be controlled by measuring the pressure in a hydraulic actuator connected to the first actuating element 38a. Once the pressure in the hydraulic actuator increases and reaches a threshold value after the first actuating element 38a contacts the first clamp arm 28a, the hydraulic actuator will no longer actuate the first actuating element 38a.

[0117] In the present disclosure, an elastic element is provided, which can eliminate the gap between the pressing portion 32 and the protrusion 30 when the centering element 20 is in the first position (i.e., before being withdrawn from the inner side of the motor base 10), thereby preventing the position of the motor base 10 from shifting after the centering element 20 leaves the first position.

[0118] The present disclosure further provides a machine tool, comprising the above-mentioned fixture 12. As an example, the machine tool may be a lathe, such as a vertical lathe.

[0119] The above is only a preferred embodiment of the present disclosure. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present disclosure. These improvements and modifications should also be regarded as within the scope of protection of the present disclosure.

Claims

1. A fixture (12) for a motor base (10), characterized in that: include: A centering assembly (14), the centering assembly (14) comprising a centering element (20) provided with a centering fitting portion (18), the centering element (20) being configured to be movable in an axial direction (A) to switch between a first position and a second position, wherein when the centering element (20) is in the first position, the centering fitting portion (18) is engaged with a stop on an inner peripheral surface of the motor base (10), and when the centering element (20) is in the second position, the centering fitting portion (18) is withdrawn to an outer side of the motor base (10) along the axial direction (A); and A retaining assembly (16) is disposed outside the motor base (10) and is configured to engage with the motor base (10) when the centering element (20) is in the first position to maintain the position of the motor base (10) after the centering element (20) is switched from the first position to the second position.

2. The clamp (12) according to claim 1, characterized in that A plurality of centering fitting portions (18) having the same curvature are spaced apart in the circumferential direction (C).

3. The clamp (12) according to claim 1, characterized in that A plurality of centering fitting portions (18) with different curvatures are coaxially arranged.

4. The clamp (12) according to claim 1, characterized in that The centering assembly (14) further comprises an actuator for driving the centering element (20) to move in an axial direction (A); The centering element (20) comprises a centering block (22) and a centering disc (24), wherein the centering block (22) is provided with the centering fitting portion (18) and is detachably connected to the centering disc (24); The actuator is connected to the centering mass (22) via the centering disc (24).

5. The clamp (12) according to claim 1, characterized in that An upper surface (26) of the centering element (20) facing the motor base (10) is provided with a drainage groove, the drainage groove extends in a radial direction and is formed with a port facing radially outward.

6. The clamp (12) according to claim 1, characterized in that The centering assembly (14) further comprises a detection element arranged below the centering element (20), wherein the detection element is provided with a detection hole for spraying an air flow toward the centering element (20); The centering element (20) is configured to be separated from the detection element when in the first position and to cover the detection hole when in the second position.

7. The clamp (12) according to any one of claims 1 to 6, characterized in that The retaining assembly (16) includes a pair of clamping arms (28), each of the pair of clamping arms (28) being provided with a pressing portion (32) for engaging with a convex portion (30) on an outer peripheral surface of the motor base (10), and the pair of pressing portions (32) being configured to be located on opposite sides of the convex portion (30) in a clamping state, so as to clamp the convex portion (30) together through a pair of forces acting in opposite directions.

8. The clamp (12) according to claim 7, characterized in that The pair of pressing portions (32) are configured to be arranged opposite to each other in the axial direction (A) in a clamped state; At least one of the pressing portions (32) is configured to be movable in a radial direction so as to avoid the motor base (10) when the motor base (10) is placed on the centering element (20).

9. The clamp (12) according to claim 7, characterized in that At least one of the clamp arms (28) includes a main body (34) and a pressing head (36) detachably connected to the main body (34), wherein the pressing head (36) is provided with the pressing portion (32).

10. The clamp (12) according to claim 7, characterized in that At least one of the clamp arms (28) includes a joint bearing, which supports the pressing portion (32) so that the pressing portion (32) can swing under the support of the joint bearing, so that the pressing portion (32) can engage with the protrusion (30) at an adaptive angle.

11. The clamp (12) according to claim 7, characterized in that The retaining assembly (16) further comprises: a drive element (38) for applying a clamping force to the clamping arm (28); and A support element (40) for supporting the clamping arm (28), wherein The driving element (38) and the supporting element (40) define a power arm of the clamping arm (28), and the protrusion (30) and the supporting element (40) define a resistance arm of the clamping arm (28).

12. The clamp (12) according to claim 11, characterized in that The driving element (38) includes a first driving element (38a) and a second driving element (38b), and the holding assembly (16) further includes an elastic element. The elastic element is connected to a first clamping arm (28a) of the pair of clamping arms (28), and is used to apply force to the first clamping arm (28a) through elastic deformation so that the first clamping arm (28a) is elastically maintained in an engagement position in which the pressing portion (32) of the first clamping arm (28a) is engaged with the protrusion (30). wherein the first driving element (38a) is configured to move toward the first clamping arm (28a) after the first clamping arm (28a) is elastically held in the engaged position, so that the first clamping arm (28a) is rigidly held in the engaged position, and The second driving element (38b) is configured to apply force to the second clamping arm (28b) of the pair of clamping arms (28) after the first clamping arm (28a) is rigidly maintained in the engaged position, so that the pressing portion (32) of the first clamping arm (28a) and the pressing portion (32) of the second clamping arm (28b) apply a clamping force to the protrusion (30) relative to each other.

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