CN113560934A - Accurate positioning and moving mechanism of precise numerical control machine tool - Google Patents
Accurate positioning and moving mechanism of precise numerical control machine tool Download PDFInfo
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- CN113560934A CN113560934A CN202111044437.1A CN202111044437A CN113560934A CN 113560934 A CN113560934 A CN 113560934A CN 202111044437 A CN202111044437 A CN 202111044437A CN 113560934 A CN113560934 A CN 113560934A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
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Abstract
The utility model relates to a precision numerical control machine tool accurate positioning moving mechanism, relate to the field of digit control machine tool, it is used for the drive to remove the part and goes up and down, including ball, ball includes nut and lead screw, lead screw and nut threaded connection, the one end and the removal part of lead screw are connected, be connected with drive nut pivoted driving motor on the nut, still include to rotate the actuating mechanism who carries out the braking to the nut, actuating mechanism is including setting up the power-off brake inside driving motor, power-off brake electricity is connected with central controller, driving motor is connected with the central controller electricity. The application has the effect of reducing the potential safety hazard.
Description
Technical Field
The application relates to the field of numerical control machine tools, in particular to a precise positioning and moving mechanism of a precise numerical control machine tool.
Background
At present, a lifting device used for pushing a moving part on a machine tool to lift is usually arranged on the machine tool, the lifting part in the related technology usually utilizes a motor to drive a screw rod to rotate, the screw rod rotates to drive a nut to lift, and the nut lifts to drive the moving part to lift more accurately. When the lead screw stops rotating, the mobile part is accurately positioned.
In view of the above related art, the inventor thinks that when the motor is suddenly out of control and the power is cut off, the lead screw cannot be driven to rotate continuously, the moving part may fall, and thus the potential safety hazard is easily caused.
Disclosure of Invention
In order to reduce the emergence of potential safety hazard, this application provides a precision numerical control machine tool accurate positioning moving mechanism.
The application provides a precision numerical control machine tool accurate positioning moving mechanism adopts following technical scheme:
the utility model provides a precision numerical control machine tool accurate positioning moving mechanism, it is used for driving moving part to go up and down, including ball, ball includes nut and lead screw, lead screw and nut threaded connection, the one end and the moving part of lead screw are connected, be connected with drive nut pivoted driving motor on the nut, still include the arrestment mechanism that carries out the braking to the nut, arrestment mechanism is including setting up the power-off brake inside driving motor, power-off brake electricity is connected with central controller, driving motor is connected with central controller electricity.
Through adopting above-mentioned technical scheme, start driving motor, driving motor drive nut rotates, thereby the nut rotates and drives the lead screw and accomplishes the lift, when driving motor outage out of control suddenly, central controller detects the signal that driving motor sent, control later and lose the state that electric brake presents emergency braking, thereby it is difficult to rotate to make driving motor's output shaft locked, the nut is difficult to rotate this moment, the difficult condition that appears the whereabouts of lead screw and moving part, be convenient for reduce the emergence of potential safety hazard.
Preferably, be connected through belt, belt pulley between driving motor's the output shaft and the nut, arrestment mechanism still includes electromagnetic braking ware, and electromagnetic braking ware's one end is equipped with the internal spline cover, and the one end of nut is connected with the external spline, and the internal spline cover is connected with external spline matched with, and electromagnetic braking ware is connected with the central controller electricity, and one side of belt is equipped with the photoelectric sensor who is used for monitoring belt fracture state, and photoelectric sensor is connected with the central controller electricity.
Through adopting above-mentioned technical scheme, driving motor's output shaft passes through the belt, belt pulley drives the nut state, and when photoelectric sensor sensed the belt and took place the fracture, photoelectric sensor sent signal to central controller, and central controller sends signal to electromagnetic braking ware, through the braking of internal spline cover with the external splines, and the nut is difficult to continue to rotate this moment, and the condition of whereabouts is difficult to appear in lead screw and moving part.
Preferably, be connected with driving synchronous pulley on driving motor's the output shaft, the one end fixedly connected with driven synchronous pulley of nut is connected through the belt between driving synchronous pulley and the driven synchronous pulley, and driving motor's one end is connected with the support, is connected with adjustment mechanism on the support, and adjustment mechanism includes to rotate with a lateral wall of support and is connected with adjusting screw, driving motor last fixedly connected with regulating plate, adjusting screw and regulating plate threaded connection.
By adopting the technical scheme, the output shaft of the driving motor rotates to drive the driving synchronous belt pulley to rotate, the driving synchronous belt pulley rotates to drive the driven synchronous belt pulley through the belt, and the driven synchronous belt pulley rotates to drive the nut to rotate; when the tightness of the belt needs to be adjusted, the adjusting screw is rotated, the adjusting screw rotates to drive the adjusting plate and the driving motor to move towards the direction close to or away from the driven synchronous belt wheel, the driving motor moves to drive the driving synchronous belt wheel to move towards the direction close to or away from the driven synchronous belt wheel, so that the tightness of the belt can be adjusted, and the operation is simple and convenient.
Preferably, a lubricating channel is formed in one end face of the screw rod, a flow channel penetrating through the screw rod is formed in the side wall of the screw rod, and the flow channel is communicated with the lubricating channel.
Through adopting above-mentioned technical scheme, to the inside lubricating oil that lets in of lubricated passageway, lubricating oil flows into inside the runner to the port department from the runner breaks away from the runner, is convenient for paint lubricating oil to the outer wall of lead screw, and then the relative nut motion of lead screw of being convenient for.
Preferably, be connected with the limiting mechanism on the support, limiting mechanism includes power component, promotion subassembly and arc pole, the support is rotated towards the direction that is close to the arc pole and is connected with a pivot, pivot and arc pole fixed connection, fixedly connected with spring between power component and the arc pole, the arc pole tightly supports the lead screw lateral wall under the effort of spring, power component promotes the arc pole through blowing and to the direction motion of keeping away from the lead screw, week side of pivot is equipped with the restriction piece of contact pivot, fixedly connected with guide ring on the support, restriction piece and guide ring sliding connection, and the restriction piece slides towards the direction that is close to or keeps away from the pivot, the centrifugal force that the promotion subassembly rotated and brings through the nut promotes the direction motion that the restriction piece is close to the pivot.
By adopting the technical scheme, before the movable part is controlled to lift, the power assembly is controlled to push the arc-shaped rod to move towards the direction far away from the screw rod through air blowing until the arc-shaped rod is separated from the screw rod, at the moment, the nut is controlled to rotate through the driving motor, and the screw rod and the movable part can be driven to lift through the rotation of the nut; when the nut rotates, the pushing assembly pushes the limiting block to move towards the direction close to the rotating shaft through centrifugal force caused by rotation of the nut, so that the limiting block tightly abuts against the rotating shaft, the rotating shaft is difficult to rotate, namely the arc-shaped rod is kept in a state of being separated from the screw rod, and the screw rod can smoothly complete lifting;
when the driving motor is out of control and the power is off or the belt is broken, the nut stops rotating under the braking of the power-off brake or the electromagnetic brake, at the moment, the pushing assembly is difficult to push the limiting block, and the rotating shaft can rotate; therefore, the arc-shaped rod gradually moves towards the direction close to the screw rod under the action force of the spring until the arc-shaped rod tightly abuts against the screw rod, and the situation that the screw rod and the moving part fall is further limited.
Preferably, the power component includes the stay tube with support fixed connection, fixedly connected with bellows between stay tube and the arc pole, bellows and stay tube intercommunication, the slip chucking has the piston in the stay tube, the one end intercommunication of stay tube has the breather pipe, the breather pipe is located the piston and keeps away from one side of bellows, the breather pipe is kept away from the one end of stay tube and is connected with gas blowing device, be equipped with the connecting rod between piston and the arc pole, the one end and the piston of connecting rod are articulated, the other end and arc pole are articulated.
Through adopting above-mentioned technical scheme, when the direction motion of arc pole to keeping away from the lead screw is controlled to needs, be connected breather pipe and gas blowing device, control gas blowing device blows to the stay tube in along the breather pipe. The piston moves towards the direction close to the arc-shaped rod under the action of air pressure, the piston moves to push the arc-shaped rod to move towards the direction far away from the screw rod through the connecting rod until the arc-shaped rod is separated from the screw rod, then the vent pipe and the air blowing device are controlled to be separated from each other, the piston can move towards the direction far away from the arc-shaped rod at the moment, and the spring is convenient to pull the arc-shaped rod to move towards the direction close to the screw rod. The arrangement of the power assembly is convenient for controlling the arc-shaped rod to move towards the direction far away from the screw rod, and the manpower is not required to be continuously applied, so that the manpower is saved.
Preferably, the pushing assembly comprises a plurality of knocking balls arranged around the circumferential direction of the nut, a connecting rope is fixedly connected between each knocking ball and the nut, and when the nut rotates, the knocking balls strike the limiting blocks in the direction close to the rotating shaft.
By adopting the technical scheme, when the nut rotates, the nut rotates to drive the plurality of knocking balls to rotate through the connecting rope, and the limiting blocks can be continuously knocked by the rotation of the plurality of knocking balls, so that the limiting blocks are abutted against the rotating shaft; the pivot is difficult to rotate this moment, and the arc pole can keep breaking away from the state of lead screw, need not to apply other external force can, comparatively use manpower and materials sparingly.
Preferably, the number of the guide rings is two, the rotating shaft is located between the two guide rings, and each guide ring is internally and slidably connected with one limiting block.
By adopting the technical scheme, the rotating shaft is positioned between the two limiting blocks, and when the nut rotates forwards and backwards, the nut can drive the knocking balls to knock one of the limiting blocks, so that one of the limiting blocks tightly abuts against the rotating shaft.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when the driving motor is suddenly out of control and is powered off, the screw rod and the moving part are not easy to fall down, so that the potential safety hazard is reduced;
2. when the belt is broken, the screw rod and the moving part are not easy to fall;
3. when the driving motor is out of control and is powered off or the belt is broken, the limiting mechanism further limits the screw rod and the moving part from falling.
Drawings
Fig. 1 is a sectional view of a lifting device according to an embodiment of the present application.
Fig. 2 is a sectional view of an integrated brake mechanism according to an embodiment of the present application.
Fig. 3 is a schematic diagram of a photoelectric sensor integrated in an embodiment of the present application.
FIG. 4 is a schematic view of a restriction mechanism according to an embodiment of the present application.
FIG. 5 is a cross-sectional view of a two-body power module according to an embodiment of the present application.
Description of reference numerals: 1. a moving member; 11. a fixed block; 12. a locking block; 2. a ball screw; 21. a nut; 22. a screw rod; 221. a lubrication channel; 222. a flow channel; 223. lubricating the joint; 3. a support; 31. an angular contact bearing; 32. a spacer ring; 33. a precision lock nut; 34. a gland; 35. a lip-shaped seal ring; 36. an O-shaped sealing ring; 4. a drive mechanism; 41. a servo motor; 42. a connecting plate; 43. a driving synchronous pulley; 44. a driven synchronous pulley; 5. a brake mechanism; 51. an electromagnetic brake; 52. an external spline; 53. an inner spline housing; 54. a photosensor; 55. a prevention ring; 56. a seal ring; 57. a dust-proof sleeve; 6. an adjustment mechanism; 61. an adjusting plate; 62. an adjusting screw; 7. a limiting mechanism; 71. an arcuate bar; 711. a rotating shaft; 72. a power assembly; 721. a breather pipe; 722. supporting a tube; 723. a bellows; 724. a support bar; 725. a piston; 726. a connecting rod; 73. a pushing assembly; 731. knocking and hitting the ball; 732. connecting ropes; 74. a guide ring; 741. mounting a rod; 75. a limiting block; 76. a block body; 77. a spring.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
Example one
The embodiment of the application discloses accurate positioning and moving mechanism of a precise numerical control machine. Referring to fig. 1, the lifting device of the machine tool is used for driving a moving part 1 to lift, the lifting device of the machine tool comprises a ball screw and a bracket 3 fixedly connected with the machine tool, the ball screw comprises a nut 21 and a screw 22, the bracket 3 is rotatably connected with the nut 21, the nut 21 is in threaded connection with the screw 22, and one end of the screw 22 is fixedly connected with the moving part 1. The driving mechanism 4 for driving the nut 21 to rotate is connected to the bracket 3.
When the moving part 1 needs to be controlled to lift, the driving mechanism 4 is started to drive the nut 21 to rotate, and the nut 21 rotates to drive the screw rod 22 and the moving part 1 to finish lifting.
One end of the screw rod 22 penetrates through the moving component 1, one end of the screw rod 22 penetrating through the moving component 1 is connected with the fixed block 11 through a key, and one end of the screw rod 22 is connected with a locking block 12 tightly abutting against one side wall of the fixed block 11 through threads. The fixed block 11 is tightly abutted against one side wall of the moving component 1, and the moving component 1 is connected with the fixed block 11 through a screw.
Referring to fig. 2, the driving mechanism 4 includes a driving motor, a connecting plate 42, a driving timing pulley 43, and a driven timing pulley 44. The driving motor in this embodiment is a servo motor 41, the servo motor 41 is fixedly connected with a connecting plate 42, and the connecting plate 42 is fixedly connected with the bracket 3 through screws. The driving synchronous pulley 43 and the driven synchronous pulley 44 are arranged inside the bracket 3, the driven synchronous pulley 44 is sleeved outside the nut 21, and the driven synchronous pulley 44 is fixedly connected with the nut 21. The output shaft of the servo motor 41 is coaxially arranged with the driving synchronous pulley 43 and connected with the driving synchronous pulley 43 through an expansion sleeve, and the driving synchronous pulley 43 is connected with the driven synchronous pulley 44 through a belt.
When the servo motor 41 is started, the output shaft of the servo motor 41 drives the driving synchronous pulley 43 to rotate, the driving synchronous pulley 43 drives the driven synchronous pulley 44 to rotate through the belt, the driven synchronous pulley 44 rotates to drive the nut 21 to rotate, and therefore the screw rod 22 and the moving part 1 can be controlled to complete lifting.
In order to limit the falling of the moving component 1 caused by the sudden breakage of the belt during the lifting of the moving component 1, a braking mechanism 5 is connected to the bracket 3.
The brake mechanism 5 comprises an electromagnetic brake 51 fixedly connected with one surface wall of the bracket 3, one end of the driven synchronous pulley 44 close to the electromagnetic brake 51 is fixedly connected with an external spline 52 through a screw, the electromagnetic brake 51 comprises an internal spline housing 53 arranged towards the direction close to the external spline 52, and the external spline 52 and the internal spline housing 53 are matched and connected with each other. The electromagnetic brake 51 is electrically connected to a central controller, and referring to fig. 3, a photoelectric sensor 54 is connected to the bracket 3, and the photoelectric sensor 54 is used for monitoring the driving condition of the belt.
Referring to fig. 2 and 3, when the photoelectric sensor 54 detects that the belt is broken, the photoelectric sensor 54 feeds a signal back to the central controller, and the central controller controls the electromagnetic brake 51 to be in a braking state, so that the condition that the screw rod 22 falls is limited, and the condition that the moving part 1 falls is further limited.
Referring to fig. 2, in order to limit the occurrence of the situation that the servo motor 41 is out of control and is powered off during the lifting of the moving part 1, and the moving part 1 falls, the braking mechanism 5 further includes a power-off brake arranged inside the servo motor 41, the power-off brake is electrically connected with a central controller, and the central controller is electrically connected with the servo motor 41. When the central controller receives a signal that the servo motor 41 is out of control and is powered off, the central controller controls the power-off brake to be in a braking state, so that the rotation of the output shaft of the servo motor 41 is limited, at the moment, the driving synchronous pulley 43, the driven synchronous pulley 44 and the nut 21 are difficult to rotate, and the screw rod 22 and the moving part 1 are difficult to fall.
A circle of preventing ring 5 is arranged between the inner ring of the electromagnetic brake 51 and the outer side surface of the screw rod 22. The outer side surface of the preventing ring 55 is fixedly connected with the electromagnetic brake 51, and the inner side surface contacts the outer side wall of the screw rod 22. The prevention ring 55 does not affect the elevation of the lead screw 22. One end of the electromagnetic brake 51, which is far away from the frame, is provided with a sealing ring 56, and the sealing ring 56 is clamped between the electromagnetic brake 51 and the prevention ring 55, so that the situation that external dust or oil mist and other impurities enter the electromagnetic brake 51 is reduced.
Referring to fig. 1, a dust-proof cover 57 is sleeved on the outer side of one end of the screw rod 22 far away from the moving part 1, the dust-proof cover 57 covers one end of the screw rod 22, one end of the dust-proof cover 57 close to the electromagnetic brake 51 is fixedly connected with the electromagnetic brake 51, and the dust-proof cover 57 plays a certain role in protecting the screw rod 22.
Referring to fig. 2, an angular contact bearing 31 is disposed between the bracket 3 and the nut 21, the angular contact bearing 31 is sleeved outside the nut 21, and an outer side wall of the nut 21 abuts against an inner ring of the angular contact bearing 31. A spacer ring 32 and a precision locking nut 33 are further arranged between the bracket 3 and the nut 21, the spacer ring 32 and the precision locking nut 33 are located at one end of the electromagnetic brake 51 far away from the angular contact bearing 31, and both the spacer ring 32 and the precision locking nut 33 are sleeved outside the nut 21. A precision lock nut 33 is screwed to the nut 21, and the precision lock nut 33 is tightened against the inner ring of the angular contact bearing 31 by a spacer ring 32. Both the spacer ring 32 and the precision lock nut 33 rotate together with the rotation of the nut 21.
A gland 34 for compressing the outer ring of the angular contact bearing 31 is further arranged between the bracket 3 and the nut 21, the gland 34 is positioned at one end of the angular contact bearing 31 far away from the spacer ring 32, and the gland 34 is tightly connected with the bracket 3 through screws. A lip-shaped sealing ring 35 is clamped between the pressing cover 34 and the nut 21, the lip-shaped sealing ring 35 is positioned at one end of the pressing cover 34 far away from the angular contact bearing 31, and an O-shaped sealing ring 36 is clamped between the pressing cover 34 and the support 3.
In order to adjust the tightness of the belt, the bracket 3 is connected with an adjusting mechanism 6. The adjusting mechanism 6 comprises an adjusting plate 61 fixedly connected with the connecting plate 42, and an adjusting screw 62 is rotatably connected with one side wall of the bracket 3. One end of the adjusting screw 62 close to the adjusting plate 61 is screwed to the adjusting plate 61, and the length direction of the adjusting screw 62 is arranged along the direction from the driving synchronous pulley 43 to the driven synchronous pulley 44.
When the tightness of the belt needs to be adjusted, the screw between the bracket 3 and the connecting plate 42 is screwed, so that the connecting plate 42 can move relative to the bracket 3. Then, the adjusting screw 62 is rotated, the adjusting screw 62 rotates forward and backward to drive the adjusting plate 61 and the connecting plate 42 to move towards or away from the driven synchronous pulley 44, and the connecting plate 42 moves to drive the servo motor 41 and the driving synchronous pulley 43 to move towards or away from the driven synchronous pulley 44, so that the tightness of the belt can be adjusted.
Referring to fig. 1 and 2, a lubrication channel 221 is formed in one end surface of the screw 22 close to the moving member 1, and the lubrication channel 221 is disposed inside the screw 22. A flow passage 222 penetrating through the screw rod 22 is formed in the side wall of the screw rod 22, and one end of the lubricating passage 221 away from the moving member 1 is communicated with the flow passage 222. A lubricating joint 223 is installed at one end of the lubricating channel 221 near the moving part 1, and lubricating oil can be injected into the lubricating channel 221 from the lubricating joint 223. The lubricating oil flows out of the inside of the flow passage 222 from both ends of the flow passage 222, so that the side wall of the screw rod 22 is coated with the lubricating oil.
The implementation principle of the precise positioning and moving mechanism of the precise numerical control machine tool in the embodiment of the application is as follows: when the servo motor 41 is started, the output shaft of the servo motor 41 rotates to drive the nut 21 to rotate through the driving synchronous pulley 43 and the driven synchronous pulley 44, and the nut 21 rotates to drive the screw rod 22 and the moving part 1 to lift.
When the servo motor 41 is out of control and is powered off, the central controller controls the power-off brake to perform emergency braking, so that the output shaft of the servo motor 41 is limited to rotate, the nut 21 stops rotating, and the screw rod 22 and the moving part 1 both stop lifting.
When the photoelectric sensor 54 senses that the belt is broken, the photoelectric sensor 54 feeds back a signal to the central controller, the central controller controls the electromagnetic brake 51 to brake emergently, at the moment, the driven synchronous pulley 44 and the nut 21 stop rotating, and the screw rod 22 and the moving part 1 stop lifting.
Example two
The embodiment of the application discloses accurate positioning and moving mechanism of a precise numerical control machine. Referring to fig. 4 and 5, the difference from the first embodiment is that a limiting mechanism 7 is connected to the bracket 3 in order to further limit the falling of the moving member 1.
The limiting mechanism 7 comprises an arc-shaped rod 71, a power assembly 72 and a pushing assembly 73. The arc-shaped rod 71 is tightly attached to one side wall of the screw rod 22, a rotating shaft 711 is fixedly connected to the arc-shaped rod 71, the rotating shaft 711 is arranged towards the direction close to the support 3, and the rotating shaft 711 is rotatably connected with the support 3. Two sides of the rotating shaft 711 are respectively provided with a guide ring 74, and a mounting rod 741 is fixedly connected between each guide ring 74 and the bracket 3. A limiting block 75 made of a soft material is slidably connected in each guide ring 74, one side surface of the limiting block 75 close to the rotating shaft 711 contacts with the rotating shaft 711, and the limiting block 75 slides towards the direction close to or away from the rotating shaft 711.
Fixedly connected with block 76 on the power component 72, be equipped with spring 77 between fixed block 11 and arc pole 71, spring 77's one end and block 76 fixed connection, the other end and arc pole 71 fixed connection. The spring 77 is in tension so as to pull the arcuate lever 71 against the side wall of the lead screw 22. The power assembly 72 is arranged on one side of the arc rod 71 far away from the screw rod 22, and the power assembly 72 pushes the arc rod 71 to rotate in the direction far away from the screw rod 22 through air blowing. The pushing assembly 73 pushes one of the limiting blocks 75 to cling to the rotating shaft 711 by the centrifugal force caused by the rotation of the nut 21, so as to limit the rotation of the rotating shaft 711.
Referring to fig. 1 and 5, before the moving part 1 is controlled to lift, the arc rod 71 is pushed by the power assembly 72 to move in a direction away from the screw rod 22, and then the servo motor 41 is started, and the servo motor 41 drives the nut 21 to rotate so as to drive the screw rod 22 and the moving part 1 to lift; during the rotation of the nut 21, the centrifugal force caused by the rotation of the nut 21 controls the pushing assembly 73 to push one of the limiting blocks 75 to be tightly attached to the rotating shaft 711, so that the rotating shaft 711 is not easy to rotate, and the arc-shaped rod 71 is kept in a state of being separated from the screw rod 22.
When the servo motor 41 is out of control and power is off or the belt is broken, the nut 21 stops rotating and the screw rod 22 stops lifting under the braking of the power-off brake or the electromagnetic brake 51. At this time, the rotating shaft 711 can rotate, and the arc rod 71 gradually moves towards the screw rod 22 under the action of the spring 77 until the arc rod 71 tightly abuts against the screw rod 22. This further restricts the screw 22 and the moving member 1 from falling.
Referring to fig. 4 and 5, the power assembly 72 includes a vent tube 721, a support tube 722, and a bellows 723. A supporting rod 724 is fixedly connected between the supporting tube 722 and the bracket 3, a corrugated pipe 723 is fixedly connected between the supporting tube 722 and the arc-shaped rod 71, and the corrugated pipe 723 and the supporting tube 722 are communicated with each other. The end of the support tube 722 far away from the bellows 723 is communicated with the vent tube 721, a piston 725 is slidably clamped in the support block, and the piston 725 is positioned between the vent tube 721 and the bellows 723. A connecting rod 726 is arranged between the piston 725 and the arc-shaped rod 71, one end of the connecting rod 726 is hinged with the piston 725, and the other end is hinged with the arc-shaped rod 71. An air blowing device (not shown) is connected to an end of the air pipe 721 remote from the support pipe 722.
When it is necessary to control the arc rod 71 to rotate away from the screw rod 22, the air pipe 721 is connected to the air blowing device and blows air into the support tube 722, and the piston 725 moves towards the arc rod 71 under the pushing of the air pressure in the support tube 722. The piston 725 moves to push the arc rod 71 to rotate away from the lead screw 22 through the connecting rod 726, and the bellows 723 is gradually extended. When the arc rod 71 is separated from the screw rod 22, the air pipe 721 is detached from the air blowing device, so that the piston 725 can smoothly move in a direction away from the arc rod 71 when the arc rod 71 rotates in a direction close to the screw rod 22.
The pushing assembly 73 includes a plurality of striking balls 731 disposed around the circumference of the nut 21, and a connecting string 732 is fixedly connected between each striking ball 731 and the nut 21. When the nut 21 rotates forwards and backwards, the nut 21 drives the knocking ball 731 to rotate through the connecting rope 732, and the knocking ball 731 continuously knocks one of the limiting blocks 75 under the action of centrifugal force, so that the limiting block 75 tightly butts against the rotating shaft 711, and the rotating shaft 711 can be limited to rotate.
The implementation principle of the precise positioning and moving mechanism of the precise numerical control machine tool in the embodiment of the application is as follows: before controlling the moving part 1 to lift, the air pipe 721 is connected to the air blowing device and blows air into the supporting tube 722, at this time, the piston 725 pushes the arc rod 71 to rotate away from the lead screw 22 through the connecting rod 726 until the arc rod 71 is separated from the lead screw 22. Then, the servo motor 41 is started to control the nut 21 to rotate, and the nut 21 rotates to drive the screw rod 22 and the moving part 1 to lift. At this time, the nut 21 rotates to drive the knocking ball 731 to continuously knock one of the limiting blocks 75 under the action of centrifugal force, the limiting block 75 abuts against the rotating shaft 711, the rotating shaft 711 is difficult to rotate, and the arc-shaped rod 71 is kept in a state of being separated from the screw rod 22.
When the servo motor 41 is out of control and power is off or the belt is broken, the nut 21 stops rotating and the screw rod 22 stops lifting under the braking of the power-off brake or the electromagnetic brake 51. At this time, the knocking ball 731 stops knocking the rotating shaft 711, the rotating shaft 711 can rotate, and the arc-shaped rod 71 gradually moves towards the direction close to the screw rod 22 under the action of the spring 77 until the arc-shaped rod 71 tightly abuts against the side wall of the screw rod 22. The occurrence of dropping of the screw 22 and the moving member 1 is further restricted.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The utility model provides a precision numerical control machine tool accurate positioning moving mechanism, its is used for driving moving part (1) to go up and down, includes ball, and ball includes nut (21) and lead screw (22), and lead screw (22) and nut (21) threaded connection, the one end and the moving part (1) of lead screw (22) are connected, are connected with drive nut (21) pivoted driving motor on nut (21), its characterized in that: the brake mechanism (5) is used for braking the nut (21), the brake mechanism (5) comprises a power-off brake arranged in the driving motor, the power-off brake is electrically connected with a central controller, and the driving motor is electrically connected with the central controller.
2. The precise positioning and moving mechanism of the precise numerical control machine according to claim 1, characterized in that: the brake mechanism (5) further comprises an electromagnetic brake (51), an inner spline sleeve (53) is arranged at one end of the electromagnetic brake (51), an outer spline (52) is connected to one end of the nut (21), the inner spline sleeve (53) is connected with the outer spline (52) in a matched mode, the electromagnetic brake (51) is electrically connected with the central controller, a photoelectric sensor (54) used for monitoring the fracture state of the belt is arranged on one side of the belt, and the photoelectric sensor (54) is electrically connected with the central controller.
3. The precise positioning and moving mechanism of the precise numerical control machine according to claim 1, characterized in that: be connected with driving synchronous pulley (43) on driving motor's the output shaft, the one end fixedly connected with driven synchronous pulley (44) of nut (21), be connected through the belt between driving synchronous pulley (43) and driven synchronous pulley (44), driving motor's one end is connected with support (3), be connected with adjustment mechanism (6) on support (3), adjustment mechanism (6) include rotate with a lateral wall of support (3) and be connected with adjusting screw (62), driving motor is last fixedly connected with regulating plate (61), adjusting screw (62) and regulating plate (61) threaded connection.
4. The precise positioning and moving mechanism of the precise numerical control machine according to any one of claims 1 to 3, characterized in that: a lubricating channel (221) is formed in one end face of the screw rod (22), a flow channel (222) penetrating through the screw rod (22) is formed in the side wall of the screw rod (22), and the flow channel (222) is communicated with the lubricating channel (221).
5. The precise positioning and moving mechanism of the precise numerical control machine according to claim 2, characterized in that: the limiting mechanism (7) is connected to the support (3), the limiting mechanism (7) comprises a power assembly (72), a pushing assembly (73) and an arc-shaped rod (71), the support (3) is rotatably connected with a rotating shaft (711) towards the direction close to the arc-shaped rod (71), the rotating shaft (711) is fixedly connected with the arc-shaped rod (71), a spring (77) is fixedly connected between the power assembly (72) and the arc-shaped rod (71), the arc-shaped rod (71) tightly supports against the side wall of the screw rod (22) under the action force of the spring (77), the power assembly (72) pushes the arc-shaped rod (71) to move towards the direction far away from the screw rod (22) through blowing, limiting blocks (75) contacting the rotating shaft (711) are arranged on the peripheral side of the rotating shaft (711), a guide ring (74) is fixedly connected to the support (3), the limiting blocks (75) are slidably connected with the guide ring (74), and the limiting blocks (75) slide towards the direction close to or far away from the rotating shaft (711), the pushing assembly (73) pushes the limiting block (75) to move in the direction close to the rotating shaft (711) through the centrifugal force caused by the rotation of the nut (21).
6. The precise positioning and moving mechanism of the precise numerical control machine according to claim 5, characterized in that: the power assembly (72) comprises a supporting pipe (722) fixedly connected with the support (3), a corrugated pipe (723) is fixedly connected between the supporting pipe (722) and the arc-shaped rod (71), the corrugated pipe (723) is communicated with the supporting pipe (722), a piston (725) is clamped in the supporting pipe (722) in a sliding mode, one end of the supporting pipe (722) is communicated with a ventilating pipe (721), the ventilating pipe (721) is located on one side, away from the corrugated pipe (723), of the piston (725), one end, away from the supporting pipe (722), of the ventilating pipe (721) is connected with a blowing device, a connecting rod (726) is arranged between the piston (725) and the arc-shaped rod (71), one end of the connecting rod (726) is hinged to the piston (725), and the other end of the connecting rod is hinged to the arc-shaped rod (71).
7. The precise positioning and moving mechanism of the precise numerical control machine according to claim 5, characterized in that: the pushing assembly (73) comprises a plurality of knocking balls (731) arranged around the circumferential direction of the nut (21), a connecting rope (732) is fixedly connected between each knocking ball (731) and the nut (21), and when the nut (21) rotates, the knocking balls (731) knock the limiting block (75) in the direction close to the rotating shaft (711).
8. The precise positioning and moving mechanism of the precise numerical control machine according to claim 7, characterized in that: the number of the guide rings (74) is two, the rotating shaft (711) is positioned between the two guide rings (74), and a limiting block (75) is connected in each guide ring (74) in a sliding mode.
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