CN210452056U - Electric spindle displacement detection device and numerical control machine tool applying same - Google Patents

Abstract

The utility model provides an electricity main shaft displacement detection device and digit control machine tool of using thereof, include: the device comprises a shell, an elastic contact piece, an amplifying assembly and a measuring assembly; the center of the shell is provided with an accommodating cylinder, the peripheral side of the accommodating cylinder is provided with a supporting cylinder, and the bottom of the supporting cylinder is provided with a through hole; one end of the elastic contact piece extends into the accommodating cylinder from the through hole; the amplifying assembly comprises a first support fixed on the shell and a movable rod arranged on the first support, the movable rod comprises a first force arm and a second force arm, the length of the second force arm is smaller than that of the first force arm, and the first force arm is connected with the other end of the elastic contact element; the measuring assembly comprises a second support fixed on the shell, a pressure rod arranged between the second support and the second force arm, and a resistance strain gauge arranged on the second support, wherein the resistance strain gauge is used for measuring the acting force of the second force arm on the second support through the pressure rod. The problem of among the prior art when carrying out displacement detection to the electricity main shaft of digit control machine tool reading and adjustment step loaded down with trivial details is solved.

Description

Electric spindle displacement detection device and numerical control machine tool applying same

Technical Field

The utility model relates to a technical field of digit control machine tool, concretely relates to electricity main shaft displacement detection device and digit control machine tool of using thereof.

Background

After the electric spindle on the numerical control machine tool is assembled, the electric spindle must be calibrated to ensure that the axis of the electric spindle is within a certain deviation range relative to the positioning hole on the workbench, and then the machining precision can be ensured. However, in the actual production process, due to factors such as thermal deformation of the connecting piece, control accuracy of the transmission structure and the like, the position of the electric spindle inevitably has some small changes, and if the position deviation is too large, the problem that the quality of a processed workpiece is unqualified can occur, so that the regular detection of the position deviation of the electric spindle is beneficial to improving the yield of the processed workpiece. The existing measuring method is to read the deviation data of the main shaft in the XY direction through manual operation of a dial indicator and a specially-made tool piece in a shutdown state, and because the adjustment steps of the dial indicator are complicated, the body is limited by the space structure in the hood when the human eyes read the deviation, and the change rule of the position deviation of the main shaft is difficult to continuously measure and observe.

SUMMERY OF THE UTILITY MODEL

A primary object of the utility model is to provide an electricity main shaft displacement detection device and digit control machine tool of using to reading and the loaded down with trivial details problem of adjustment step when solving among the prior art and carrying out the displacement detection to the electricity main shaft of digit control machine tool.

In order to achieve the above object, the utility model provides an electricity main shaft displacement detection device, include: the device comprises a shell, an elastic contact piece, an amplifying assembly and a measuring assembly; an accommodating cylinder is arranged at the center of the shell, a supporting cylinder is arranged on the peripheral side of the accommodating cylinder, and a through hole is formed in the bottom of the supporting cylinder; one end of the elastic contact piece extends into the accommodating cylinder from the through hole; the amplifying assembly comprises a first support fixed on the shell and a movable rod arranged on the first support, the movable rod comprises a first force arm and a second force arm, the length of the second force arm is smaller than that of the first force arm, and the first force arm is connected with the other end of the elastic contact element; the measuring assembly comprises a second support, a pressure rod and a resistance strain gauge, the second support is fixed on the shell, the pressure rod is arranged between the second support and the second force arm, and the resistance strain gauge is arranged on the second support to measure acting force of the second force arm on the second support.

Further, the elastic contact piece comprises a spring and a position probe connected with the spring, and the position probe is used for abutting against the electric spindle.

Furthermore, the position probe comprises a probe part and a connecting part which are integrally formed, and one end of the spring is sleeved on the connecting part; when the probe part extends into the accommodating cylinder and abuts against the electric spindle, the periphery of the through hole at the bottom of the supporting cylinder stops the connecting part.

Further, the first support corresponds two that set up for from top to bottom, two first mounting hole has been seted up on the first support, the second mounting hole has been seted up on the movable rod, first mounting hole with the second mounting hole is coaxial and is provided with the round pin axle, the movable rod passes through the round pin hub connection in first support, just first arm of force with second arm of force is located respectively the both sides of round pin axle.

Furthermore, a first lug is arranged at the end part of the first force arm, and the other end of the spring is sleeved on the first lug.

Furthermore, the pressure rod is an adjusting screw, a threaded hole is formed in the second support, and the adjusting screw penetrates through the threaded hole and abuts against the end of the second force arm.

Further, the electric spindle displacement detection device further comprises an upper end cover and a lower end cover which are used for covering and sealing the shell.

Further, a data interface is arranged on the shell.

Furthermore, a first positioning hole is formed in the bottom of the containing barrel, and a second positioning hole coaxial with the first positioning hole is formed in the lower end cover.

Furthermore, the numerical control machine tool comprises an electric spindle, a positioning shaft fixed on the electric spindle and an electric spindle displacement detection device, wherein the electric spindle displacement detection device is the electric spindle displacement detection device, and the other end of the positioning shaft is arranged in the accommodating cylinder of the electric spindle displacement detection device.

Compared with the prior art, the beneficial effects of the utility model reside in that: a through hole is formed in the bottom of the supporting cylinder, one end of the elastic contact piece extends into the accommodating cylinder from the through hole, and the other end of the elastic contact piece is connected with the first force arm of the movable rod; the second force arm of the movable rod is connected with the pressure rod; the electric spindle generates pressure on the elastic contact piece due to displacement, the elastic force generated by the elastic contact piece due to pressure acts on the first force arm, and is transmitted to the second force arm through the first force arm, the amplification effect is shown when the elastic force is transmitted to the second force arm based on the lever principle and the fact that the length of the first force arm is larger than that of the second force arm, the amplified elastic force acts on the second support through the pressure rod, and then the elastic signal is converted into a current signal through the resistance strain gauge to be digitally displayed, so that the detection of the displacement of the electric spindle is completed. By the technical scheme, the problems that in the prior art, the adjusting steps and the reading are complex when the electric spindle of the numerical control machine tool is detected are solved.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic overall structure diagram of an embodiment of an electric spindle displacement detection device according to the present invention;

FIG. 2 is a schematic view of a portion of the structure of FIG. 1;

FIG. 3 is a schematic view of a portion of the structure of FIG. 2;

FIG. 4 is a schematic view of a portion of the structure of FIG. 2;

FIG. 5 is a schematic view of a portion of the structure of FIG. 2;

fig. 6 is a sectional view of a part of the structure of an embodiment of the numerical control machine tool of the present invention.

Wherein the figures include the following reference numerals:

11. a housing; 111. a data interface; 12. an upper end cover; 13. a lower end cover; 21. a receiving cylinder; 211. a first positioning hole; 22. a support cylinder; 31. a spring; 32. a position probe; 321. a probe section; 322. a connecting portion; 40. an amplifying assembly; 41. a first support; 42. a movable rod; 421. a first force arm; 4211. a first bump; 422. a second moment arm; 4221. a second bump; 43. a pin shaft; 50. a measurement assembly; 51. a second support; 52. a resistance strain gauge; 53. an adjusting screw; 54. locking the nut; 60. positioning a pin; 71. an electric spindle; 72. positioning the shaft; 73. a work bench.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Referring now to fig. 1-2, an electric spindle displacement detecting apparatus according to an exemplary embodiment of the present application will be described in detail, including a housing 11, an elastic contact, an amplifying assembly 40, and a measuring assembly 50; an accommodating cylinder 21 is arranged at the center of the shell 11, a supporting cylinder 22 is arranged on the peripheral side of the accommodating cylinder 21, and a through hole is formed in the bottom of the supporting cylinder 22; one end of the elastic contact piece extends into the accommodating cylinder 21 from the through hole; the amplifying assembly 40 comprises a first support 41 fixed on the housing 11 and a movable rod 42 arranged on the first support 41, the movable rod 42 comprises a first force arm 421 and a second force arm 422 with a length smaller than that of the first force arm 421, and the first force arm 421 is connected with the other end of the elastic contact piece; the measuring assembly 50 includes a second support 51, a pressure bar and a resistance strain gauge 52, the second support 51 is fixed on the housing 11, the pressure bar is disposed between the second support 51 and the second force arm 422, the second force arm 422 acts on the second support 51 through the pressure bar, and the resistance strain gauge 52 is disposed on the second support 51 to measure the acting force of the second force arm 422 on the second support 51.

In the utility model, a through hole is arranged on the bottom of the supporting cylinder 22, one end of the elastic contact element extends into the containing cylinder 21 from the through hole, and the other end is connected with the first force arm 421 of the movable rod 42; and the second moment arm 422 of the movable rod 42 is connected with the pressure rod; that is, the electric spindle 71 is displaced to generate pressure on the elastic contact piece, the elastic force generated by the pressed elastic contact piece acts on the first force arm 421, and then is transmitted to the second force arm 422 by the first force arm 421, based on the lever principle and the length of the first force arm 421 is larger than that of the second force arm 422, it can be known that the amplification effect is already presented when the elastic force is transmitted to the second force arm 422, the amplified elastic force acts on the second support 51 through the pressure rod, and then the resistance strain gauge 52 converts the elastic force signal into a current signal for digital display, thereby completing the detection of the displacement of the electric spindle 71. In the present technical solution, there are four support cylinders 22, the four support cylinders 22 are distributed with the center of the accommodating cylinder 21 as the origin in + X, -X, + Y, -Y (four support cylinders 22 are distributed in a plane orthogonal coordinate system Oxy established with the center of the accommodating cylinder 21 as the origin O), one support cylinder 22 corresponds to one set of elastic force contact members, the amplifying assembly 40 and the measuring assembly 50, so that the position deviation of the electric spindle 71 in the X-axis and Y-axis directions in the plane can be measured, and the position deviation data in each direction will not interfere with each other, and of course, if the e-spindle 71 is not shifted in-plane along the X-axis or Y-axis but in the quadrant between the X-axis and Y-axis, the respective spring contacts, the amplification assembly 40 and the measurement assembly 50 then cooperate to ultimately combine to produce integrated, accurate positional displacement data.

Further, the elastic contact piece comprises a spring 31 and a position probe 32 connected with the spring 31, the position probe 32 is used for abutting against the electric spindle 71, when the electric spindle 71 displaces to push the position probe 32, the position probe 32 compresses the spring 31, the displacement of the electric spindle 71 is converted into the deformation of the spring 31, and the deformation of the spring 31 is in a direct proportion relation with the displacement of the electric spindle 71; the position probe 32 comprises a probe part 321 and a connecting part 322 which are integrally formed, and one end of the spring 31 is sleeved on the connecting part 322; as shown in fig. 3, when the probe 321 is inserted into the accommodation cylinder 21 and abuts against the electric spindle 71, the peripheral stopper connecting portion 322 of the through hole of the cylinder bottom of the support cylinder 22 is stopped.

Preferably, the first supports 41 are two vertically corresponding to each other, first mounting holes are formed in the two first supports 41, second mounting holes are formed in the movable rod 42, the first mounting holes and the second mounting holes are coaxial and are provided with pin shafts 43, and the movable rod 42 is connected to the first supports 41 through the pin shafts 43. The first force arm 421 and the second force arm 422 may be located on the same side of the pin 43, or may be located on both sides of the pin 43, respectively, so as to obtain a greater amplification effect on the elastic force, further increase a variation range of the elastic force, and more accurately record a displacement of the electric spindle 71. Preferably, a first protrusion 4211 is disposed at an end of the first force arm 421, and the other end of the spring 31 is sleeved on the first protrusion 4211 to prevent the spring 31 from deviating from the original position when it is compressed and rebounded.

As shown in fig. 4 and 5, the pressure rod is an adjusting screw 53, a threaded hole is opened in the second support 51, the adjusting screw 53 passes through the threaded hole and then abuts against the end of the second force arm 422, preferably, a second projection 4221 is provided on the end of the second force arm 422, and the adjusting screw 53 abuts against the second projection 4221. The measuring assembly 50 further comprises a lock nut 54 for fastening the adjusting screw 53, and the elastic force of the spring 31 acting on the first force arm 421 is adjusted by changing the screwing amount of the adjusting screw 53, so that the pressure value measured by the resistance strain gauge 52 has a reasonable initial value.

Further, the electric spindle 71 displacement detection device further comprises an upper end cover 12 and a lower end cover 13 for covering and sealing the upper opening and the lower opening of the shell 11, and the upper end cover 12 and the lower end cover 13 respectively cover and seal the upper opening and the lower opening of the shell 11, so that the electric spindle 71 displacement detection device is in a sealed state, external dust and other impurities are prevented from polluting internal components, and smooth and accurate detection is facilitated. Further, a data interface 111 is arranged on the housing 11, and the elastic force signal detected by the resistance strain gauge 52 can be converted into a current signal through the data interface 111 and transmitted to the display device through a digital display mode.

A first positioning hole 211 is formed in the bottom of the accommodating barrel 21, a second positioning hole coaxial with the first positioning hole 211 is formed in the lower end cover 13, and the positioning pin 60 sequentially passes through the first positioning hole 211 and the second positioning hole to fix the whole detection device on the workbench 73. As shown in fig. 6, a numerical control machine tool includes an electric spindle 71, a positioning shaft 72 fixed on the electric spindle 71, and an electric spindle 71 displacement detection device, the electric spindle 71 displacement detection device is fixed on a worktable 73, the other end of the positioning shaft 72 is disposed in an accommodating cylinder 21 of the electric spindle 71 displacement detection device, when the electric spindle 71 moves to drive the positioning shaft 72 to move, a position probe 32 is pushed to compress a spring 31, a pressure amplification component 40 amplifies the resilience of the spring 31, and a measurement component 50 measures and displays the amplified resilience.

The utility model converts the offset of the electric spindle 71 into the deformation of the spring 31, and the spring 31 deforms to generate elastic force to act on the first force arm 421; on the basis of the lever principle, the length of the first force arm 421 is designed to be larger than that of the second force arm 422, so that when the elastic force is transmitted to the second force arm 422 through the first force arm 421 and is correspondingly amplified, a pressure rod is arranged between the second force arm 422 and the second support 51, the amplified elastic force is acted on the second support 51 by the second force arm 422 through the pressure rod, and the amplified elastic force signal detected on the second support 51 is converted into a current signal by the resistance strain gauge 52 to be digitally displayed. This technical scheme has overcome when adopting the amesdial that the human body need get into the inside operation of carrying out the measurement of machine, further increases the elasticity signal scope of resistance foil gage 52 collection through pressure amplification subassembly 40, and the corresponding measuring accuracy that has improved, and test data can be by data equipment continuous recording, and the operation is safe high-efficient more.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An electric spindle displacement detecting device, comprising: the device comprises a shell (11), an elastic contact piece, an amplifying assembly (40) and a measuring assembly (50);

an accommodating cylinder (21) is arranged at the center of the shell (11), a supporting cylinder (22) is arranged on the peripheral side of the accommodating cylinder (21), and a through hole is formed in the bottom of the supporting cylinder (22); one end of the elastic contact piece extends into the accommodating cylinder (21) from the through hole; the amplifying assembly comprises a first support (41) fixed on the shell (11) and a movable rod (42) arranged on the first support (41), the movable rod (42) comprises a first force arm (421) and a second force arm (422) with the length smaller than that of the first force arm (421), and the first force arm (421) is connected with the other end of the elastic contact piece; the measuring assembly comprises a second support (51), a pressure rod and a resistance strain gauge (52), the second support (51) is fixed on the shell (11), the pressure rod is arranged between the second support (51) and the second force arm (422), and the resistance strain gauge (52) is arranged on the second support (51) to measure the acting force of the second force arm (422) on the second support (51).

2. Motorized spindle displacement detection device according to claim 1, characterized in that said elastic contact piece comprises a spring (31) and a position probe (32) connected to said spring (31), said position probe (32) being intended to abut the motorized spindle.

3. The electric spindle displacement detection device according to claim 2, wherein the position probe (32) comprises a probe part (321) and a connecting part (322) which are integrally formed, and one end of the spring (31) is sleeved on the connecting part (322); when the probe part (321) extends into the accommodating barrel (21) and abuts against the electric spindle, the periphery of the through hole in the barrel bottom of the supporting barrel (22) stops the connecting part (322).

4. The electric spindle displacement detection device according to claim 3, wherein the number of the first supports (41) is two, the two first supports (41) are provided with first mounting holes, the movable rod (42) is provided with a second mounting hole, the first mounting hole and the second mounting hole are coaxial and are provided with a pin shaft (43), the movable rod (42) is connected to the first support (41) through the pin shaft (43), and the first force arm (421) and the second force arm (422) are respectively located at two sides of the pin shaft (43).

5. The electric spindle displacement detection device according to claim 4, wherein a first projection (4211) is disposed on an end of the first force arm (421), and the other end of the spring (31) is sleeved on the first projection (4211).

6. The electric spindle displacement detection device according to any one of claims 2 to 5, wherein the pressure rod is an adjusting screw (53), a threaded hole is formed in the second support (51), and the adjusting screw (53) passes through the threaded hole and abuts against an end of the second force arm (422).

7. Electric spindle displacement detection device according to claim 1, characterized in that it further comprises an upper end cap (12) and a lower end cap (13) for capping the housing (11).

8. Motorized spindle displacement detection device according to claim 7, characterized in that a data interface (111) is provided on the housing (11).

9. The motorized spindle displacement detection device according to claim 8, wherein a first positioning hole (211) is formed in a bottom of the accommodating cylinder (21), and a second positioning hole coaxial with the first positioning hole (211) is formed in the lower end cover (13).

10. A numerically controlled machine tool comprising an electric spindle (71), a positioning shaft (72) fixed to said electric spindle (71), and an electric spindle displacement detection device, characterized in that said electric spindle displacement detection device is an electric spindle displacement detection device according to any one of claims 1 to 9, and the other end of said positioning shaft (72) is disposed in said housing cylinder (21) of said electric spindle displacement detection device.

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