CN112091712A

CN112091712A - Dynamic balance adjusting device of machine tool and machine tool

Info

Publication number: CN112091712A
Application number: CN202010964819.5A
Authority: CN
Inventors: 张国庆; 周梦华; 徐刚; 陈宁
Original assignee: Shenzhen University
Current assignee: Shenzhen University
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2020-12-18
Anticipated expiration: 2040-09-14
Also published as: CN112091712B

Abstract

The dynamic balance adjusting device of the machine tool comprises a main shaft, a counterweight and an adjuster, wherein a plurality of adjusting holes are formed in the periphery of the main shaft, the counterweight is accommodated in at least one adjusting hole and connected with the main shaft, and the adjuster is used for adjusting the depth of the counterweight in the adjusting holes. Through setting up the regulator, the regulator can adjust the degree of depth of counterweight in the adjustment hole to change the mass distribution of main shaft, make the barycenter of main shaft tend to the axis of gyration, thereby reduce dynamic balance, this mode adopts the regulator to replace artifical the regulation, and dynamic balance adjusts efficiently, is favorable to improving machining efficiency.

Description

Dynamic balance adjusting device of machine tool and machine tool

Technical Field

The invention belongs to the field of machining, and particularly relates to a dynamic balance adjusting device of a machine tool and the machine tool.

Background

The ultra-precision machining technology is based on a high-precision linear motion mechanism, a rotary motion mechanism and a motion control system. Turning is a machining method that changes the shape and size of a workpiece by using rotational motion of the workpiece and linear or curvilinear motion of a tool, and is an important component of a machining method. The ultra-precise turning technology plays an important role in the development of national defense and advanced technologies, and is widely applied to important fields of aviation, aerospace, weaponry and the like. With the development of science and technology and the continuous progress of society, ultra-precision turning is already applied to the production of mass products, and the problems of reducing the processing cost and improving the processing efficiency become important to us.

In the present ultra-precision turning technology, a workpiece is usually fixed on a spindle by means of suction of a suction cup, clamping of a chuck and the like, and is driven by the spindle to rotate at a high speed, so that not only is the deviation between the geometric center of the workpiece and the rotation axis of the spindle controlled, but also the dynamic balance between the workpiece and the spindle in the rotating process needs to be considered. The dynamic balance is too large, which can affect the processing precision, even throw out the workpiece and damage the main shaft. The main shaft of the existing ultra-precision machine tool is usually provided with a dynamic balance measuring device, before a workpiece is installed and ready for processing, the dynamic balance on the main shaft needs to be measured, and the processing can not be started until the dynamic balance meets the requirement by manually adjusting a balance weight screw on the main shaft. The adjustment of the dynamic balance often takes a considerable amount of time, which greatly affects the processing efficiency.

Disclosure of Invention

The invention aims to provide a dynamic balance automatic adjusting device of a machine tool and the machine tool, which can improve the efficiency of dynamic balance adjustment and is beneficial to improving the processing efficiency.

In order to realize the purpose of the invention, the invention provides the following technical scheme:

in a first aspect, the invention provides a dynamic balance adjusting device for a machine tool, the dynamic balance adjusting device for the machine tool comprises a main shaft, a counterweight and an adjuster, wherein a plurality of adjusting holes are formed in the periphery of the main shaft, the counterweight is accommodated in at least one adjusting hole and connected with the main shaft, and the adjuster is used for adjusting the depth of the counterweight in the adjusting holes.

In one embodiment, the counterweight with adjust the hole and be screw-thread fit, the regulator includes first driving piece and fitting piece, first driving piece with the fitting piece is connected and is driven the fitting piece is rotatory, the fitting piece be used for with the counterweight is connected, in order to drive the counterweight is rotatory.

In one embodiment, the adjuster further includes a second driving member, the first driving member is connected to the second driving member, and the second driving member drives the first driving member and the engaging member to move toward or away from the direction of the adjusting hole.

In one embodiment, the plurality of adjustment holes are arranged in a circular array, and the depth of the plurality of adjustment holes is the same.

In one embodiment, the number of the weight parts is multiple, each weight part is accommodated in the corresponding adjusting hole, and the multiple weight parts are located at different depths of the adjusting holes according to dynamic balance requirements.

In one embodiment, the dynamic balancing device of the machine tool further comprises a permanent magnet and a plurality of electromagnets; the permanent magnet is arranged on the main shaft, and the electromagnets are wound around the permanent magnet and have a spacing distance with the main shaft; or the electromagnets are arranged on the main shaft, and the permanent magnets and the main shaft have a spacing distance; the permanent magnet is provided with a permanent magnetic field, and the electromagnet is used for generating an electromagnetic field so that the permanent magnet or the electrified electromagnet drives the main shaft to rotate by a preset angle.

In one embodiment, a plurality of the electromagnets correspond to a plurality of the adjusting holes one by one, and each of the electromagnets is opposite to the corresponding adjusting hole.

In one embodiment, the dynamic balance adjusting device of the machine tool further comprises a machine table, a first fastener and a second fastener, and the adjuster further comprises a base; the second driving piece is provided with a first strip-shaped hole, the base is provided with a first fixing hole, the first fixing hole is opposite to the first strip-shaped hole, and the first fastening piece passes through the first strip-shaped hole and is matched with the first fixing hole, so that the second driving piece and the base are relatively fixed; the base has been seted up the second bar hole, the second fixed orifices has been seted up to the board, the second bar hole with the second fixed orifices is relative, the second fastener passes the second bar hole and with the cooperation of second fixed orifices, so that the base with the board relatively fixed.

In one embodiment, the dynamic balance adjusting device of the machine tool further comprises a controller, the adjuster is electrically connected with the controller, the controller controls the adjuster to adjust the depth of the counterweight in the adjusting hole according to the measured dynamic balance mass deviation data, and records the depth change of the counterweight in the adjusting hole; the machine tool dynamic balance adjusting device further comprises a third driving piece, the third driving piece drives the main shaft to rotate, the third driving piece is electrically connected with the controller, and the controller acquires the rotating speed and the dynamic balance numerical value of the main shaft through the third driving piece.

In a second aspect, the invention further provides a machine tool, which comprises the dynamic balance adjusting device for the machine tool according to any one of the embodiments of the first aspect.

According to the dynamic balance adjusting device for the machine tool, the adjuster is arranged, and the adjuster can adjust the depth of the counterweight in the adjusting hole, so that the mass distribution of the main shaft is changed, the mass center of the main shaft tends to the rotary axis, and the dynamic balance is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic perspective view of a dynamic balance adjustment device of a machine tool according to an embodiment;

FIG. 2 is a schematic cross-sectional view of the dynamic balance adjustment apparatus of the machine tool of FIG. 1;

FIG. 3 is a schematic perspective view of the regulator of FIG. 1;

FIG. 4 is a cross-sectional structural schematic view of the spindle and counterweight of FIG. 1;

FIG. 5 is a schematic top view of the dynamic balance adjustment apparatus of the machine tool of FIG. 1;

FIG. 6 is a schematic diagram of the spindle, permanent magnets, and electromagnets in one embodiment;

FIG. 7 is a schematic view of the structure of the spindle, permanent magnets and electromagnets in another embodiment;

fig. 8 is a flow chart of dynamic balance adjustment of the dynamic balance adjustment device of the machine tool according to the embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Referring to fig. 1 and 2, an embodiment of the present invention provides a dynamic balance adjustment device 100 for a machine tool, such as a lathe or a grinding machine, to perform dynamic balance adjustment (preferably, an ultra-precision lathe) so that the dynamic balance is reduced to a range that can meet machining requirements. The machine tool dynamic balance adjustment apparatus 100 includes a spindle 10, a weight member 20, and an adjuster 30. A plurality of adjustment holes 101 are formed in the outer circumference of the main shaft 10, and the weight member 20 is received in at least one of the adjustment holes 101 and connected to the main shaft 10. The adjuster 30 is used to adjust the depth of the weight member 20 within the adjustment port 101.

It will be appreciated that once a workpiece is mounted on the spindle 10, deviations in the geometric centre of the workpiece (not shown) from the axis of rotation of the spindle 10, among other factors, can cause the centre of mass of the spindle 10 and workpiece to be spaced too far from the axis of rotation of the spindle 10 to be desirable. When the main shaft 10 rotates at a high speed, the unbalanced mass generates a large centrifugal inertia force, i.e., the dynamic balance can not meet the production and processing requirements. In order to make the distance between the center of mass of the spindle 10 and the workpiece and the rotation axis meet the requirement, the depth of the balance weight 20 uniformly distributed on the spindle at the adjusting hole 101 can be adjusted by the adjuster 30, so that the mass distribution of the whole (the spindle 10, the workpiece and the balance weight 20) is changed, namely, the position of the center of mass of the whole is changed. For example, if the center of mass of the main shaft 10 deviates from the rotation axis on the side close to the ground, the depth of the weight member 20 on the side close to the ground can be adjusted by the adjuster 30 at the adjusting hole 101, so that the center of mass is far away from the ground and tends to the rotation axis; or the depth of the weight member 20 at the adjusting hole 101 at the side far from the ground is adjusted to be shallow by the adjuster 30, so that the mass center is far from the ground and tends to the revolution axis. Of course, when the center of mass deviates too much from the axis of revolution, the dynamic balance can also be reduced by removing the weight 20 or adding a weight 20. The adjustment aperture 101 may be provided without a weight member 20 or with a weight member 20. The weight member 20 may be made of a plastic material such as polystyrene having a relatively light weight and a relatively high strength, or a metal material such as a copper alloy having a relatively high weight and a relatively high strength, depending on the mass of the spindle 10 and the workpiece, the rotation speed of the spindle 10, and the like. Of course, the number of the balance weights 20 may be one or more, and the balance weights 20 may be all made of plastic or all made of metal, or may be partly made of plastic and partly made of metal, depending on the mass of the spindle 10 and the workpiece, the rotation speed of the spindle 10, and the like.

Through setting up regulator 30, regulator 30 can adjust the degree of depth of counterweight 20 in adjusting hole 101 to change the mass distribution of main shaft 10, make the barycenter of main shaft 10 tend to the axis of revolution, thereby reduce dynamic balance, this mode adopts regulator 30 to replace artifical the regulation, and dynamic balance adjusts efficiently, is favorable to improving machining efficiency. In addition, the manual adjustment of the dynamic balance is very dependent on the adjustment experience of workers, and the requirements on the workers are high. Moreover, even an experienced worker is limited by the quality of the human body, and the lower limit of the dynamic balance value that can be lowered is much higher than the lower limit of the dynamic balance value that can be lowered by the adjuster 30, so that the machining accuracy and the life of the spindle 10 can be greatly improved by using the adjuster 30.

In one embodiment, referring to fig. 2 and 3, the weight member 20 is threadably engaged with the adjustment port 101. The adjuster 30 includes a first driving member 31 and a fitting member 32, and the first driving member 31 is connected to the fitting member 32 and drives the fitting member 32 to rotate. The engagement member 32 is adapted to engage the weight member 20 to rotate the weight member 20. Specifically, the adjustment holes 101 may be threaded holes. The weight member 20 may be selected from the group consisting of a hex screw, a cross-head screw, a flat head screw, and the like. The mating member 32 may be selected from a socket head wrench, an external socket head wrench, a spanner wrench, a cross wrench, etc. for tightening or loosening screws. The first driving member 31 includes a first motor 311 and a first mounting seat 312, the first motor 311 is fixed on the first mounting seat 312 by screwing, and the mating member 32 is driven by the first motor 311 to rotate. The first motor 311 is a counter-rotating motor and can drive the engaging member 32 to rotate clockwise or counterclockwise, thereby changing the depth of the weight member 20 in the adjustment hole 101. A speed reduction mechanism (not shown) may be provided in the first motor 311 to improve accuracy. Through setting up counterweight 20 and regulation hole 101 for screw thread fit, first driving piece 31 drive fitting 32 drives counterweight 20 and rotates the degree of depth that can change counterweight 20 in adjusting hole 101, is favorable to realizing the automatically regulated of dynamic balance.

In one embodiment, referring to fig. 2 and 3, the adjuster 30 further includes a second drive member 33. The first driving member 31 is connected to the second driving member 33, and the second driving member 33 drives the first driving member 31 and the engaging member 32 to move toward or away from the adjusting hole 101. Specifically, the second driving element 33 can hydraulically drive the first driving element 31 and the engaging element 32 to move, and can also drive the first driving element 31 and the engaging element 32 to move through mechanical transmission modes such as gear and rack engagement, worm and worm wheel engagement, and a transmission belt. In this embodiment, the second driving member 33 includes a second motor 331, a speed reducing mechanism 332, a screw 333, and a second mounting seat 334, the second motor 331, the speed reducing mechanism 332, and the second mounting seat 334 are connected in sequence, and the second motor 331 and the speed reducing mechanism 332 are fixed relative to the second mounting seat 334. The second motor 331 rotates the screw rod 333 through the reduction mechanism 332, the first mounting base 312 has a screw hole (not shown), the screw rod 333 is engaged with the screw hole, the second mounting base 334 includes a guide rail 3341, the first mounting base 312 is engaged with the guide rail 3341 and is movable relative to the guide rail 3341, and the moving direction of the first mounting base 312 is the same as the extending direction of the guide rail 3341. With this arrangement, the first motor 311 can drive the screw 333 to rotate, so as to drive the first mounting seat 312 to move along the extending direction of the guide rail 3341, and since the first motor 311 is fixed on the first mounting seat 312, both the first motor 311 and the fitting member 32 can move along the extending direction of the guide rail 3341. It can be understood that, when the depth of the weight member 20 in the adjustment hole 101 is adjusted, or when the next weight member 20 is adjusted (it needs to be withdrawn from or enter into the adjustment hole 101), the second driving member 33 can control the engaging member 32 and the first driving member 31 to move along the axial direction of the adjustment hole 101, so as to continue to complete the dynamic balance adjustment action, which is beneficial to further achieve automatic adjustment of the dynamic balance.

In one embodiment, referring to fig. 4, the plurality of adjustment holes 101 are arranged in a circular array. Preferably, the extension lines of the axes of the plurality of adjustment holes 101 each pass through the center of mass of the main shaft 10. The plurality of adjustment holes 101 have the same depth, and the distance between any adjacent two adjustment holes 101 is the same. Through setting up a plurality of regulation holes 101 and being annular array and arranging, regulator 30 can fully adjust the mass distribution on the main shaft 10 each position, is favorable to reducing dynamic balance to improve the machining precision.

In one embodiment, referring to fig. 4, the number of the weight members 20 is plural, each weight member 20 is accommodated in the corresponding adjusting hole 101, and the plural weight members 20 are located at different depths of the adjusting hole 101 according to the dynamic balance requirement. Specifically, it is preferable that one weight member 20 is provided in each of the adjustment holes 101. By providing a plurality of weights 20 with different depths in the adjustment port 101, the adjuster 30 can perform dynamic balance adjustment, which is advantageous for further reducing dynamic balance.

In one embodiment, referring to fig. 5 and 6, the dynamic balancing apparatus of the machine tool further includes a permanent magnet 40 and a plurality of electromagnets 50. The permanent magnet 40 is disposed on the spindle 10, and the plurality of electromagnets 50 are disposed around the permanent magnet 40 and spaced apart from the spindle 10. Specifically, the dynamic balance adjustment device 100 of the machine tool further includes a third driving element 60, a machine table 70 and a fixing ring 80, the third driving element 60 drives the main shaft 10 to rotate, the third driving element 60 and the fixing ring 80 are both fixed on the machine table 70, the plurality of electromagnets 50 are fixed on the inner wall of the fixing ring 80, and the fixing ring 80 and the main shaft 10 have a spacing distance. So that the main shaft 10 can rotate relative to the fixed ring 80. The spindle 10 includes a fixing portion 11 and a body portion 12 connected to each other, the fixing portion 11 (a suction cup, a chuck, etc.) being used for connection with a workpiece, and the body portion 12 being connected to the third driving member 60. The permanent magnet 40 is located at the junction of the fixed portion 11 and the body portion 12.

In this embodiment, the electromagnet 50 is used to generate an electromagnetic field so that the permanent magnet 40 rotates the spindle 10 by a predetermined angle. It will be appreciated that the permanent magnet 40 is fixed to the spindle 10, the permanent magnet 40 itself having a permanent magnetic field, and when the electromagnet 50 is not energized, the electromagnet 50 does not generate an electromagnetic field and the permanent magnet 40 does not interfere with the rotation of the spindle 10. When the electromagnet 50 at a specific position is energized, the electromagnet 50 generates an electromagnetic field, and the permanent magnet 40 is attracted or repelled by the electromagnet 50 due to the magnetic field force, so that the spindle 10 is driven to rotate by a specific angle, and the counterweight 20 at the position to be adjusted is aligned with the adjuster 30. It will be appreciated that the direction of current applied to the electromagnet 50 is reversed, and the resulting electromagnetic field is reversed, so that the direction of current applied to the electromagnet 50 can be controlled to cause the permanent magnet 40 to be attracted or repelled by the energized electromagnet 50. Thus, the number of the electromagnets 50 can be reduced, which is advantageous in simplifying the structure of the machine tool.

In one embodiment, referring to fig. 5 and 7, a plurality of electromagnets 50 are disposed on the spindle 10, and the permanent magnets 40 are spaced apart from the spindle 10. In this embodiment, since the permanent magnet 40 is fixed on the spindle 10, when the electromagnet 50 is energized to generate an electromagnetic field, the electromagnet 50 drives the spindle 10 to rotate by a predetermined angle under the permanent magnetic field of the permanent magnet 40.

By providing a permanent magnet 40 and a plurality of electromagnets 50, the electromagnet 50 generated by energizing the permanent magnet 40 and the electromagnet 50, the weight member 20 at the desired adjustment position can be aligned with the mating member 32 of the adjuster 30 to facilitate subsequent adjustment of the adjuster 30 to adjust the depth of the weight member 20 within the adjustment port 101. In particular, the spindle is suitable for machine tools of which the spindles can not rotate by a preset angle or can rotate by the preset angle but is too complex, and the automation of dynamic balance adjustment is facilitated. In addition, some spindles have both functions of controlling the rotational speed and rotating at a predetermined angle, and the functions are not complicated, and the electromagnet 50 and the permanent magnet 40 according to the present embodiment may not be provided.

In one embodiment, referring to fig. 5 to 7, a plurality of electromagnets 50 correspond to a plurality of adjusting holes 101 one by one, and each electromagnet 50 is opposite to the corresponding adjusting hole 101. Specifically, the plurality of electromagnets 50 are arranged in an annular array. The permanent magnet 40 is opposed to at least one adjustment hole 101. Through the above arrangement, the electromagnet 50 is electrified to align the counterweight 20 at the desired position to the mating member 32 of the adjuster 30.

In one embodiment, referring to fig. 2 and 3, the dynamic balance adjustment apparatus 100 further includes a first fastener (not shown) and a second fastener (not shown), and the adjuster 30 further includes a base 335. The second driving member 33 has a first strip-shaped hole 3341, the base 335 has a first fixing hole (not shown), the first fixing hole is opposite to the first strip-shaped hole 3341, and the first fastening member is matched with the first fixing hole through the first strip-shaped hole 3341, so that the second driving member 33 and the base 335 are relatively fixed. The base 335 has a second through hole 3351, and the machine 70 has a second fixing hole (not shown), wherein the second through hole 3351 is opposite to the second fixing hole. The second fastening member passes through the second strip-shaped hole 3351 and is engaged with the second fixing hole, so that the base 335 and the machine table 70 are relatively fixed.

Specifically, first fastener and second fastener all can select screw fitting such as screw, bolt, and corresponding, first fixed orifices, second fixed orifices are the screw hole. The figure of first fixed orifices and first bar hole 3341 is the same and be a plurality ofly, and the figure of second fixed orifices and second bar hole 3351 is the same and be a plurality ofly, so set up, is favorable to improving joint strength. The extending direction 91 at the opening of the first bar hole 3341 is perpendicular to the extending direction 92 at the opening of the second bar hole 3351, and the extending direction 92 at the opening of the second bar hole 3351 is parallel to the axial direction 93 of the spindle 10. It can be understood that, during the dynamic balance adjustment, it is necessary to ensure that the fitting member 32 can extend into the adjustment hole 101, and therefore the fitting member 32 needs to be accurately installed in the extending direction 91 at the opening of the first elongated hole 3341 and the extending direction 92 at the opening of the second elongated hole 3351. The relative position of the second driving member 33 and the base 335 can be adjusted by adjusting the position of the first fastening member in the first elongated hole 3341. Similarly, the relative position of the base 335 and the machine table 70 can be adjusted by adjusting the position of the second fastening member in the second elongated hole 3351, so that the fitting member 32 is aligned with the adjusting hole 101, and it can be ensured that the fitting member 32 can accurately and smoothly extend into the adjusting hole 101. Preferably, the end surface of the end of the fitting member 32 far from the first motor 311 has a chamfered structure, which is beneficial to further ensure that the fitting member 32 can smoothly extend into the adjusting hole 101 and cooperate with the weight member 20 to adjust the depth of the weight member 20 in the adjusting hole 101.

In one embodiment, referring to fig. 2, the dynamic balance adjustment apparatus 100 further includes a controller (not shown), and the adjuster 30 is electrically connected to the controller. The controller controls the adjuster 30 to adjust the depth of the weight member 20 of the mass deviation in the adjustment port 101 based on the measured dynamic balance mass deviation data and to record the change in depth of the weight member 20 in the adjustment port. The third driving element 60 is electrically connected to a controller, and the controller obtains the rotation speed and the dynamic balance value of the spindle 10 through the third driving element 60.

In particular, the controller may be selected as a computer program for controlling the operation of the machine tool. Through setting up the controller, the rotational speed of main shaft 10, dynamic balance numerical value and the required moving distance of the required counterweight 20 of reaching the dynamic balance requirement are recorded and stored to the controller, and the controller can refer to the parameter and the effect of adjusting before every turn in the dynamic balance adjustment of follow-up every turn, and the controller inputs more accurate adjustment data (depth control numerical value of counterweight 20 etc.) to regulator 30 to reach the purpose of quick adjustment dynamic balance, be favorable to further improving machining efficiency.

In addition, in order to prevent the occurrence of the situation that the rotating speed is too high when the workpiece is just mounted, the dynamic balance is too large to throw the workpiece out of or damage the main shaft 10, a mode that the rotating speed is gradually provided for a user in the controller, and the user is required to input a plurality of rotating speeds with gradient increase under the condition of being lower than the required rotating speed n and numerical values respectively corresponding to the dynamic balance required to be achieved. For example, when the required target rotation speed of the main shaft 10 is 2000n/min, the user may sequentially input a plurality of rotation speeds, such as 500n/min, 1000n/min, 1500n/min, etc., and simultaneously provide the dynamic balance value to be reached by the corresponding rotation speed, so as to ensure that the workpiece is not thrown out or the main shaft 10 is not damaged when the rotation speed is increased to the next rotation speed. The controller may automatically load successively higher rotational speeds to lower the dynamic balance until the measured dynamic balance value is lower than the desired dynamic balance value at a rotational speed n. Moreover, the controller can generate recommended dynamic balance values of different target rotating speeds according to the data recorded by the database, and a user can select to adopt the recommended values or input the target values by himself. The data of the database comprises the parameters and the effects of previous adjustment and also a plurality of groups of target values input by a user according to the production habits.

Referring to fig. 8, an adjusting process of the dynamic balance adjusting apparatus 100 of the machine tool according to the embodiment of the present invention is as follows:

step 1: entering a dynamic balance adjusting mode;

step 2: inputting the working rotating speed n of the main shaft 10 and a required dynamic balance value B;

and step 3: rotating the main shaft 10 and measuring a dynamic balance value b;

and 4, step 4: judging whether B is smaller than B;

if B is smaller than B, executing step 5;

and 5: the regulator 30 is removed, and the dynamic balance adjustment is completed:

if B is larger than or equal to B, sequentially executing the step 6, the step 7 and the step 3;

step 6: rotating the main shaft 10 to a mass deviation angle so that the weight member 20 at the position of mass deviation is aligned with the mating member 32 of the adjuster 30;

and 7: the controller controls the adjuster 30 to adjust the depth of the corresponding weight member 20 within the adjustment port 101 via the mating member 32, the first drive member 31 and the second drive member 33.

The embodiment of the invention also provides a machine tool, which can be a grinding machine, a lathe and the like, and is preferably an ultra-precision lathe. Referring to fig. 1, a machine tool includes a dynamic balance adjustment apparatus 100 of the machine tool provided by the present invention. Specifically, the machine tool further includes a tool (not shown) and a holder on which the tool is fixed, the tool being opposed to the spindle. By adding the dynamic balance adjusting device 100 of the machine tool provided by the invention into the machine tool, the machine tool can automatically adjust the dynamic balance of the main shaft 10, and the processing efficiency of the machine tool is improved.

Claims

1. The dynamic balance adjusting device of the machine tool is characterized by comprising a main shaft, a counterweight and an adjuster, wherein a plurality of adjusting holes are formed in the periphery of the main shaft, the counterweight is accommodated in at least one adjusting hole and connected with the main shaft, and the adjuster is used for adjusting the depth of the counterweight in the adjusting holes.

2. The dynamic balance adjustment apparatus of claim 1, wherein the weight member is threadedly engaged with the adjustment port, and the adjuster comprises a first driving member and a fitting member, the first driving member being connected with the fitting member and driving the fitting member to rotate, the fitting member being adapted to be connected with the weight member to rotate the weight member.

3. The dynamic balance adjustment apparatus of claim 2, wherein said adjuster further comprises a second driving member, said first driving member being connected to said second driving member, said second driving member driving said first driving member and said mating member to move toward or away from said adjustment aperture.

4. The dynamic balance adjustment apparatus of a machine tool according to claim 1, wherein a plurality of said adjustment holes are arranged in a circular array, and the depth of the plurality of said adjustment holes is the same.

5. The dynamic balance adjustment device of a machine tool according to claim 1, wherein the number of the balance weights is plural, each of the balance weights is accommodated in the corresponding adjustment hole, and the plural balance weights are located at different depths of the adjustment hole according to dynamic balance requirements.

6. The dynamic balance adjustment device of a machine tool according to any one of claims 1 to 5, further comprising a permanent magnet and a plurality of electromagnets;

the permanent magnet is arranged on the main shaft, and the electromagnets are wound around the permanent magnet and have a spacing distance with the main shaft; or the electromagnets are arranged on the main shaft, and the permanent magnets and the main shaft have a spacing distance; the permanent magnet is provided with a permanent magnetic field, and the electromagnet is used for generating an electromagnetic field so that the permanent magnet or the electrified electromagnet drives the main shaft to rotate by a preset angle.

7. The dynamic balance adjustment device of a machine tool according to claim 6, wherein a plurality of said electromagnets are in one-to-one correspondence with a plurality of said adjustment holes, and each of said electromagnets is opposed to a corresponding said adjustment hole.

8. The dynamic balance adjustment device of a machine tool according to claim 3, further comprising a machine table, a first fastener and a second fastener, the adjuster further comprising a base;

the second driving piece is provided with a first strip-shaped hole, the base is provided with a first fixing hole, the first fixing hole is opposite to the first strip-shaped hole, and the first fastening piece passes through the first strip-shaped hole and is matched with the first fixing hole, so that the second driving piece and the base are relatively fixed;

the base has been seted up the second bar hole, the second fixed orifices has been seted up to the board, the second bar hole with the second fixed orifices is relative, the second fastener passes the second bar hole and with the cooperation of second fixed orifices, so that the base with the board relatively fixed.

9. The dynamic balance adjustment apparatus of a machine tool according to claim 1, further comprising a controller, the adjuster being electrically connected to the controller, the controller controlling the adjuster to adjust the depth of the weight member of mass deviation in the adjustment hole based on the measured dynamic balance mass deviation data, and recording the change in depth of the weight member in the adjustment hole;

the machine tool dynamic balance adjusting device further comprises a third driving piece, the third driving piece drives the main shaft to rotate, the third driving piece is electrically connected with the controller, and the controller acquires the rotating speed and the dynamic balance numerical value of the main shaft through the third driving piece.

10. A machine tool comprising a dynamic balance adjustment apparatus of a machine tool according to any one of claims 1 to 9.