CN205785806U - A kind of ball screw assembly, Static stiffness measurement apparatus with rotation compensation function - Google Patents

Abstract

The utility model relates to a static stiffness measuring device of a ball screw pair with a rotation compensation function. The device comprises a sensor fixture, a screw measuring reference, a screw measuring reference fixing device, a nut measuring device and a rotation compensating device. The nut measuring device is arranged on the flange of the lead screw to be tested, and the rotation compensation device is arranged on the nut measuring device; The reference fixing device, the screw measuring reference fixing device is located in the middle of the screw measuring reference, the sensor fixture is located on the outer periphery of the screw measuring reference fixing device, wherein the rotation compensation device penetrates the screw measuring reference and is fixedly connected to the nut measuring device. The utility model is easy to install, has high test data repeatability, and the measurement data is true and reliable.

Description

A Static Stiffness Measuring Device of Ball Screw Pair with Rotation Compensation Function

technical field

The utility model belongs to the field of rigidity detection of a ball screw pair, in particular to a static stiffness measuring device for a ball screw pair with a rotation compensation function.

Background technique

Ball screw pairs are widely used in feed systems. With the continuous increase of the speed of the ball screw pair, its vibration problem is becoming more and more prominent, which seriously affects the positioning accuracy and accuracy maintenance ability of the feed system. The rigidity of the ball screw pair seriously affects the transmission performance and vibration amplitude of the feed system. Insufficient rigidity of the ball screw pair has become the main obstacle for the development of CNC machine tools and automation equipment to high speed and high precision.

At present, there are many deficiencies in the measurement of the static stiffness of the ball screw pair. For example, the distance between the sensor and the screw axis is not fixed during the measurement process, the measured length of the screw is not fixed for each measurement, and the sensor is inconvenient to adjust. And after a large number of ball screw pair rigidity detection tests, it was found that the ball screw pair would rotate during the test, and the existing measuring device only detects the axial deformation of the screw, but does not detect the rotational deformation of the screw.

Utility model content

The technical problem solved by the utility model is to provide a static stiffness measuring device of a ball screw pair with a rotation compensation function.

The technical solution to realize the purpose of this utility model is: a ball screw pair static stiffness measurement device with rotation compensation function, including sensor fixture, screw measurement reference, screw measurement reference fixing device, nut measurement device and rotation compensation device .

The nut measuring device is arranged on the flange of the lead screw to be tested, and the rotation compensation device is arranged on the nut measuring device; The reference fixing device, the screw measuring reference fixing device is located in the middle of the screw measuring reference, the sensor fixture is located on the outer periphery of the screw measuring reference fixing device, wherein the rotation compensation device penetrates the screw measuring reference and is fixedly connected to the nut measuring device.

Compared with the prior art, the utility model has the remarkable advantages as follows: 1) The utility model has the function of rotation and torsion compensation, and eliminates the axial displacement caused by the micro-rotation of the screw due to the system clearance, and the torsion of the workpiece such as the measurement reference of the screw; The axial deformation test error caused by the axial deformation. The actual rigidity measurement accuracy is effectively improved. 2) The comprehensive axial displacement of the utility model is measured by 2 or 3 sensors, which can ensure that the sensors are located at an accurate position, and can accurately obtain the displacement of the screw axis, eliminating the slight non-parallel deformation of the screw, and the sensor Measurement errors caused by factors such as poor position repeatability. 3) The utility model greatly reduces the measured length of the lead screw, eliminates the error caused by the deformation of the pressure rod due to the overhanging of the lead screw, and improves the accuracy of the test. 4) The utility model can accurately control the distance between the screw measurement reference and the nut measurement device through the gauge block, which greatly improves the repeatability of the test. 5) It is simple and convenient to replace the tested sample only by adjusting the screw measuring reference fixing device. 6) The sensor device of the present utility model is reliable and easy to adjust. The utility model can measure the rotation deformation of the lead screw and compensate the axial deformation of the ball screw pair, so that the data is more accurate.

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Description of drawings

FIG. 1 is an assembly diagram of the overall structure of a ball screw pair static stiffness measuring device with rotation compensation function of the utility model.

Fig. 2 is a schematic structural diagram of the sensor fixture of the present invention.

Fig. 3 is a schematic diagram of the measurement reference structure of the lead screw of the present invention.

Fig. 4 is a structural schematic diagram of the screw measuring reference fixing device of the present invention.

Fig. 5 is a schematic diagram of the structure of the inner elastic taper sleeve in the measuring reference fixing device for the screw of the present invention.

Fig. 6 is a structural schematic diagram of the nut measuring device of the present invention.

Fig. 7 is a structural schematic diagram of the rotation compensation device of the present invention.

Fig. 8 is a structural schematic diagram of the flange connector of the present invention.

detailed description

In combination with Fig. 1, a static stiffness measurement device of a ball screw pair with a rotation compensation function of the utility model includes a sensor fixture I, a screw measurement reference II, a screw measurement reference fixing device III, a nut measurement device IV and a rotation compensation Apparatus V.

The nut measuring device IV is set on the flange of the screw to be tested, the rotation compensation device V is set on the nut measuring device IV; the screw measuring standard II is set on the screw to be tested, and the sensor is set on the screw measuring standard II Fixture I and lead screw measurement benchmark fixture III, lead screw measurement benchmark fixture III is located in the middle of lead screw measurement benchmark II, sensor fixture I is located on the outer circumference of lead screw measurement benchmark fixture III, and rotation compensation device V runs through the lead screw for measurement The benchmark II is fixedly connected to the nut measuring device IV.

The sensor fixture I is fixedly connected to the sensor, and the number of the sensor fixture I is two, and the two fixtures are symmetrically distributed on the lead screw measurement reference II at 180°; the sensor fixture I includes a fixture shell 1, a threaded sleeve 2, screw 3 and nylon plug 4, the fixture shell 1 is fixed on the screw measuring standard II, and the inside of the fixture shell 1 is equipped with a threaded sleeve 2, a screw 3 and a nylon plug 4, and one end of the nylon plug 4 has an internal thread, and the other end There is a semi-circular groove, in which the internal thread matches the external thread of the screw 3, the threaded sleeve 2 is set on the screw 3 and is threadedly connected with the fixture shell 1, and the screw 3 is also provided with a compression spring, which is located between the threaded sleeve 2 and the nylon plug 4, the nylon plug 4 and the sensor can be pressed tightly by adjusting the threaded sleeve 2.

Alternatively, the sensor fixture I is fixedly connected to the sensor, and the number of the sensor fixture I is three, and the three fixtures are evenly distributed on the lead screw measurement reference II at 120°; the sensor fixture I includes a fixture shell 1, a threaded sleeve 2. The screw 3 and the nylon plug 4, the fixture shell 1 is fixed on the lead screw measurement reference II, the fixture shell 1 is equipped with a threaded sleeve 2, the screw 3 and the nylon plug 4, and one end of the nylon plug 4 has an internal thread, There is a semi-circular groove at the other end, wherein the internal thread matches the external thread of the screw rod 3, the threaded sleeve 2 is sleeved on the screw rod 3 and is threadedly connected with the fixture shell 1, and a compression spring is also arranged on the screw rod 3, and the compression spring is located between the threaded sleeve 2 and the clamp housing 1. Between the nylon plugs 4, the nylon plug 4 and the sensor can be pressed tightly by adjusting the threaded sleeve 2.

The screw measuring reference fixing device III includes a threaded sleeve 11, an outer elastic taper sleeve 12, an inner elastic taper sleeve 13 and a shell, and the threaded sleeve 11, the outer elastic taper sleeve 12, and the inner elastic taper sleeve 13 are all located in the shell, Wherein the inner elastic taper sleeve 13 is set on the lead screw, the outer wall surface of the inner elastic taper sleeve 13 is a tapered surface, the outer wall surface of the inner elastic taper sleeve 13 matches the inner wall surface of the outer elastic taper sleeve 12, and the threaded sleeve 11 is located on the outer elastic cone The top of the sleeve 12 is used to press the outer elastic taper sleeve 12 and the inner elastic taper sleeve 13 tightly, so that the lead screw measurement benchmark fixing device III is fixed on the lead screw.

The tapered surface of the inner elastic taper sleeve 13 has a taper of 6°, and the inner elastic taper sleeve 13 is uniformly grooved in the circumferential direction, and the directions of two adjacent grooves are opposite.

The shape of the nut measuring device IV is a disk, on which there are symmetrically distributed equal-height block guide grooves 16, and the nut measuring device IV is also provided with a rotation compensating device mounting groove 17 for placing the rotation compensating device V. The nut measuring device There is a chrome-plated block placing groove 18 for placing the chrome-plated block on the IV, and the sensor contacts are in contact with the chrome-plated block.

The rotation compensation device V includes a rotation compensation measurement column 19 and a connecting plate 20, the rotation compensation measurement column 19 is fixed on the nut measurement device IV through the connection plate 20, and the upper cylindrical surface of the rotation compensation measurement column 19 is milled into a plane. The contacts of the sensor for detecting the amount of screw rotation deflection are in contact. The number of rotation compensation measuring columns 19 is three.

Below in conjunction with embodiment the utility model is described in further detail.

Example 1

The utility model discloses a ball screw pair static stiffness measurement device with rotation compensation function, which comprises a sensor fixture I, a screw measurement reference II, a screw measurement reference fixing device III, a nut measurement device IV, and a rotation compensation device V. The sensor fixture fixes the sensors, which can be evenly distributed at 120° on the lead screw measurement benchmark II. The measuring datum fixing device of the screw adopts inner and outer elastic taper sleeves and a nut pressing method to fix the measuring datum of the screw on the screw. And the rotation deformation can be measured by the rotation compensation device V, so as to compensate the static stiffness detection of the ball screw pair.

The sensor fixture I includes a fixture shell 1 , a threaded sleeve 2 , a screw rod 3 and a nylon plug 4 . One end of the nylon plug 4 has an internal thread, which is connected with one end of the screw rod 3 with an external thread. The other end of the nylon plug 4 is provided with a semicircular arc groove, which matches with the cylindrical surface of the sensor. The threaded sleeve 2 is set on the screw rod 3, and there is a compression spring between the threaded sleeve 2 and the nylon plug 4, so that the sensor can be compressed by adjusting the threaded sleeve 2. When measuring, the number of sensor fixtures I is selected to be 3, and the number is evenly distributed at 120°.

When measuring, select the positioning hole 5 of the screw measurement reference II, the positioning hole 5 is in clearance fit with the fixture shell 1, and is connected by a nut to ensure that the axial displacement sensor 120° is evenly distributed on the same indexing circle concentric with the screw shaft. The installation holes [8][9][10] of the rotation compensation device are in transition fit with the rotation compensation measuring column 19.

The screw measuring reference fixing device III includes a threaded sleeve 11 , an outer elastic taper sleeve 12 and an inner elastic taper sleeve 13 . The outer elastic taper sleeve 12 and the inner elastic taper sleeve 13 are all provided with 120° evenly distributed grooves 14 to 15, and their opening directions are opposite, so that the outer elastic taper sleeve 12 and the inner elastic taper sleeve 13 shrink and expand evenly. The outer elastic taper sleeve 12 and the inner elastic taper sleeve 13 are matched with the same taper, the taper is 6°, the material is 65Mn, and then quenched to make it have good elasticity, which is convenient for the threaded sleeve 11 to compress the inner and outer elastic taper sleeves, so The lead screw measurement reference II can be fixed at a certain place of the lead screw and kept relatively stationary with the lead screw.

The nut measuring device IV includes a contour block guide groove 16 , a rotation compensation device installation groove 17 , and a chrome-plated block placement groove 18 . The contour block guide groove 16 is convenient for placing the contour block during installation of the measuring device to ensure that the measured length of the screw is consistent each time; the connecting plate 20 is placed in the installation groove 17 of the rotation compensation device, and the rotation compensation device V and the nut measuring device are connected by screws IV. The chrome-plated 45 steel strip is placed in the chrome-plated block placement groove 18, connected by screws, the sensor contact contacts with the chrome-plated surface, and the measured data is more accurate. The flange connecting piece 21 is connected with the nut measuring device IV through 6 screw holes evenly distributed on the surface, and there are 3 evenly distributed screw holes on the cylindrical surface of the flange connecting piece 21, and the flange connecting piece 21 can be connected with the nut measuring device IV by tightening the screws. The nut remains relatively stationary.

The rotation compensation device V includes a rotation compensation measurement column 19 and a connecting plate 20 . The cylindrical surface of the upper end of the rotation compensation measurement column 19 is milled into a plane, which is in contact with the sensor contact point to measure the amount of rotation deformation, and the rotation compensation measurement column 19 is connected to the nut measurement device IV through the connecting plate 20 . The number of rotation compensation measuring columns 19 is three during the measurement.

It can be seen from the above that the utility model has the function of rotation and torsion compensation, and eliminates the axial deformation test caused by the axial displacement caused by the small rotation of the lead screw caused by the system clearance, and the axial deformation caused by the torsion of the workpiece such as the measurement reference of the lead screw. error. The actual rigidity measurement accuracy is effectively improved.

Example 2

The utility model discloses a ball screw pair static stiffness measurement device with rotation compensation function, which comprises a sensor fixture I, a screw measurement reference II, a screw measurement reference fixing device III, a nut measurement device IV, and a rotation compensation device V. The sensor fixture fixes the sensors, which can be installed symmetrically at 180° on the lead screw measurement base II. The measuring datum fixing device of the screw adopts inner and outer elastic taper sleeves and a nut pressing method to fix the measuring datum of the screw on the screw. And the amount of rotation deformation can be measured by the rotation compensation device V, so as to compensate the static stiffness detection of the ball screw pair.

The sensor fixture I includes a fixture shell 1 , a threaded sleeve 2 , a screw rod 3 and a nylon plug 4 . One end of the nylon plug 4 has an internal thread, which is connected with one end of the screw rod 3 with an external thread. The other end of the nylon plug 4 is provided with a semicircular arc groove, which matches with the cylindrical surface of the sensor. The threaded sleeve 2 is set on the screw rod 3, and there is a compression spring between the threaded sleeve 2 and the nylon plug 4, so that the sensor can be compressed by adjusting the threaded sleeve 2. When measuring, the number of sensor fixtures I is selected to be 2, and the distribution is symmetrical at 180°.

When measuring, select the positioning hole 6 of the screw measurement reference II, the positioning hole 6 is in clearance fit with the fixture shell 1, and is connected by a nut to ensure that the axial displacement sensor 120° is evenly distributed on the same indexing circle concentric with the screw shaft. The installation holes [8][9][10] of the rotation compensation device are in transition fit with the rotation compensation measuring column 19.

The screw measuring reference fixing device III includes a threaded sleeve 11 , an outer elastic taper sleeve 12 and an inner elastic taper sleeve 13 . The outer elastic taper sleeve 12 and the inner elastic taper sleeve 13 are all provided with 120° evenly distributed grooves 14 to 15, and their opening directions are opposite, so that the outer elastic taper sleeve 12 and the inner elastic taper sleeve 13 shrink and expand evenly. The outer elastic taper sleeve 12 and the inner elastic taper sleeve 13 are matched with the same taper, the taper is 6°, the material is 65Mn, and then quenched to make it have good elasticity, which is convenient for the threaded sleeve 11 to compress the inner and outer elastic taper sleeves, so The lead screw measurement reference II can be fixed at a certain place of the lead screw and kept relatively stationary with the lead screw.

The nut measuring device IV includes a contour block guide groove 16 , a rotation compensation device installation groove 17 , and a chrome-plated block placement groove 18 . The contour block guide groove 16 is convenient for placing the contour block during installation of the measuring device to ensure that the measured length of the screw is consistent each time; the connecting plate 20 is placed in the installation groove 17 of the rotation compensation device, and the rotation compensation device V and the nut measuring device are connected by screws IV. The chrome-plated 45 steel strip is placed in the chrome-plated block placement groove 18, connected by screws, the sensor contact contacts with the chrome-plated surface, and the measured data is more accurate. The flange connecting piece 21 is connected with the nut measuring device IV through 6 screw holes evenly distributed on the surface, and there are 3 evenly distributed screw holes on the cylindrical surface of the flange connecting piece 21, and the flange connecting piece 21 can be connected with the nut measuring device IV by tightening the screws. The nut remains relatively stationary.

The rotation compensation device V includes a rotation compensation measurement column 19 and a connecting plate 20 . The cylindrical surface of the upper end of the rotation compensation measurement column 19 is milled into a plane, which is in contact with the sensor contact point to measure the amount of rotation deformation, and the rotation compensation measurement column 19 is connected to the nut measurement device IV through the connecting plate 20 . During the measurement, the number of rotation compensation measurement columns 19 is selected to be 3.

It can be seen from the above that the utility model has the function of rotation and torsion compensation, and eliminates the axial deformation test caused by the axial displacement caused by the small rotation of the lead screw caused by the system clearance, and the axial deformation caused by the torsion of the workpiece such as the measurement reference of the lead screw. error. The actual rigidity measurement accuracy is effectively improved.

Claims (8)

1. a ball screw assembly, Static stiffness measurement apparatus with rotation compensation function, it is characterized in that, including clamp of sensor [I], leading screw measuring basis [II], leading screw measuring basis fixing device [III], nut measurement apparatus [IV] and rotation compensation device [V]；

Described nut measurement apparatus [IV] is arranged on the flange of leading screw to be measured, and rotation compensation device [V] is arranged in nut measurement apparatus [IV]；Leading screw measuring basis [II] is enclosed within tested leading screw, clamp of sensor [I] and leading screw measuring basis fixing device [III] are set on leading screw measuring basis [II], leading screw measuring basis fixing device [III] is positioned at the middle part of leading screw measuring basis [II], clamp of sensor [I] is positioned at the periphery of leading screw measuring basis fixing device [III], and wherein rotation compensation device [V] runs through leading screw measuring basis [II] and is connected in nut measurement apparatus [IV].

The ball screw assembly, Static stiffness measurement apparatus with rotation compensation function the most according to claim 1, it is characterized in that, the upper sensor that is connected of clamp of sensor [I], the quantity of clamp of sensor [I] is two, and these two fixtures are symmetrically distributed on leading screw measuring basis [II] with 180 °；Described clamp of sensor [I] includes fixture shell [1], thread bush [2], screw rod [3] and nylon plug [4], described fixture shell [1] is fixed on leading screw measuring basis [II], fixture shell [1] is internal equipped with thread bush [2], screw rod [3] and nylon plug [4], there is female thread described nylon plug [4] one end, the other end has half slot, wherein female thread matches with the external screw thread of screw rod [3], thread bush [2] is enclosed within screw rod [3] and above and threadeds with fixture shell [1], screw rod also sets up stage clip on [3], this stage clip is positioned between thread bush [2] and nylon plug [4], nylon plug [4] can be compressed with sensor by regulation thread bush [2].

The ball screw assembly, Static stiffness measurement apparatus with rotation compensation function the most according to claim 1, it is characterized in that, the upper sensor that is connected of clamp of sensor [I], the quantity of clamp of sensor [I] is three, and these three fixtures are distributed on leading screw measuring basis [II] with 120 °；Described clamp of sensor [I] includes fixture shell [1], thread bush [2], screw rod [3] and nylon plug [4], described fixture shell [1] is fixed on leading screw measuring basis [II], fixture shell [1] is internal equipped with thread bush [2], screw rod [3] and nylon plug [4], there is female thread described nylon plug [4] one end, the other end has half slot, wherein female thread matches with the external screw thread of screw rod [3], thread bush [2] is enclosed within screw rod [3] and above and threadeds with fixture shell [1], screw rod also sets up stage clip on [3], this stage clip is positioned between thread bush [2] and nylon plug [4], nylon plug [4] can be compressed with sensor by regulation thread bush [2].

The ball screw assembly, Static stiffness measurement apparatus with rotation compensation function the most according to claim 1, it is characterised in that described leading screw measuring basis fixing device [III] include thread bush [11], outer elastic conical drogue [12],

Interior elastic conical drogue [13] and shell, described thread bush [11], outer elastic conical drogue [12], interior elastic conical drogue [13] is respectively positioned in shell, interior elastic conical drogue [13] is enclosed within leading screw, the outside wall surface of interior elastic conical drogue [13] is the conical surface, the outside wall surface of interior elastic conical drogue [13] matches with the internal face of outer elastic conical drogue [12], thread bush [11] is positioned at the top of outer elastic conical drogue [12], for outer elastic conical drogue [12] is compressed with interior elastic conical drogue [13], so that leading screw measuring basis fixing device [III] is fixed on leading screw.

The ball screw assembly, Static stiffness measurement apparatus with rotation compensation function the most according to claim 4, it is characterized in that, the conical degree of conical surface of interior elastic conical drogue [13] is 6 °, and the circumference of interior elastic conical drogue [13] uniformly has groove, adjacent two grooves in opposite direction.

The ball screw assembly, Static stiffness measurement apparatus with rotation compensation function the most according to claim 1, it is characterized in that, nut measurement apparatus [IV] be shaped as disk, symmetrical isometry block guiding groove [16] is had on it, rotation compensation device mounting groove [17] placing rotation compensation device [V] is also had in nut measurement apparatus [IV], having chromium plating block placing trough [18] placing chromium plating block in nut measurement apparatus [IV], sensor contact contacts with chromium plating block simultaneously.

The ball screw assembly, Static stiffness measurement apparatus with rotation compensation function the most according to claim 1, it is characterized in that, described rotation compensation device [V] includes rotation compensation measurement column [19] and connecting plate [20], rotation compensation measurement column [19] is fixed in nut measurement apparatus [IV] by connecting plate [20], rotation compensation measurement column [19] face of cylinder, upper end is become plane by milling, and this plane contacts with the contact of detection leading screw rotational deformation quantity sensor.

The ball screw assembly, Static stiffness measurement apparatus with rotation compensation function the most according to claim 7, it is characterised in that the quantity of rotation compensation measurement column [19] is 3.