CN110320034A - A kind of linear bearing linearity measurer based on corner variation - Google Patents

Abstract

A straightness measurement device for linear bearings based on changes in rotation angle, including a housing, a measuring rod, a gear, a magnetic head, a rotation angle detection element, and a signal processor; a measuring rod mounting hole is opened in the housing, and the measuring rod can be mounted in the measuring rod mounting hole. Linear movement, a thrust spring is provided between the measuring rod and the mounting hole of the measuring rod; the surface of the measuring rod body is provided with a linear moving guide groove; the limit guide pin is fixed on the housing, and the end of the limit guide pin extends to the linear moving guide groove Inside, the limit guide pin cooperates with the linear movement guide groove, which can limit the degree of freedom of rotation of the measuring rod, and can limit the linear movement range of the measuring rod; the gear is arranged in the side shell of the measuring rod, and the gear can rotate freely; There is a rack on the surface of the rod body of the measuring rod, and the gear and the rack are meshed; the magnetic head is fixed on the end of the gear shaft, and the rotation angle detection element is installed in the housing and is set opposite to the magnetic head; the signal output end of the rotation angle detection element is connected to the signal processor Make electrical connections.

Description

A Linear Bearing Straightness Measuring Device Based on Rotation Angle Variation

technical field

The invention belongs to the technical field of linear bearing wear detection, and in particular relates to a linear bearing straightness measuring device based on rotation angle change.

Background technique

Linear bearing is a kind of rolling or sliding bearing used for linear motion. It has the characteristics of small friction, reliable structure, strong bearing capacity, high long-distance running precision and long service life. It is widely used in precision machine tools, textile machinery, In the sliding parts of industrial machinery such as food packaging machinery and printing machinery.

The straightness of the linear bearing will have a direct impact on the linearity and stability of the bearing movement. Therefore, the linear bearing will be regularly tested for straightness during daily use. The commonly used testing tool is a dial gauge, which needs to be fixed on a magnetic On the table seat, and then directly measure the straightness of the linear bearing through a dial gauge. However, the measurement accuracy of this detection method is not high, it is easily disturbed by random factors, and it cannot perform automatic measurement during the operation of the linear bearing, nor can it automatically analyze and process the measurement data.

Contents of the invention

Aiming at the problems existing in the prior art, the present invention provides a linear bearing straightness measurement device based on the change of rotation angle, which has the characteristics of high measurement accuracy and high measurement sensitivity, can realize automatic measurement during the operation of the linear bearing, and can analyze the measurement data Perform automated analytical processing.

In order to achieve the above object, the present invention adopts the following technical solutions: a linear bearing straightness measurement device based on the change of rotation angle, including a housing, a measuring rod, a gear, a magnetic head, a rotation angle detection element and a signal processor; There is a measuring rod mounting hole, the measuring rod mounting hole is a blind hole structure, the measuring rod is installed in the measuring rod mounting hole, the measuring rod has a linear movement degree of freedom in the measuring rod mounting hole, and the tail end of the measuring rod is in contact with the measuring rod A thrust spring is connected between the bottoms of the rod installation holes; a linear movement guide groove is provided on the surface of the rod body of the measuring rod, and the linear movement guide groove is parallel to the measuring rod; a limit guide pin is fixed on the housing , the end of the limit guide pin extends into the linear movement guide groove, through the cooperation of the limit guide pin and the linear movement guide groove, the degree of freedom of rotation of the measuring rod is limited, and the linear movement range of the measuring rod is limited; The gear is arranged in the housing on the side of the measuring rod, the gear shaft of the gear is perpendicular to the measuring rod, and the gear has a degree of freedom of rotation; a rack is arranged on the surface of the rod body of the measuring rod, and the gear and the rack are meshed; the magnetic head Fixed on the end of the gear shaft of the gear, the rotation angle detection element is installed in the housing and is set facing the magnetic head, leaving a measurement gap between the magnetic head and the rotation angle detection element; the signal output end of the rotation angle detection element is connected to the signal processor Make electrical connections.

The magnetic head is a cylindrical permanent magnet, and the magnetic head is coaxially fixedly connected with the gear shaft of the gear.

The magnetic head has only one pair of N-S poles.

The rotation angle detection element adopts a giant magnetoresistance element or a three-axis Hall element.

Beneficial effects of the present invention:

The straightness measuring device of the linear bearing based on the change of the rotation angle of the present invention has the characteristics of high measurement accuracy and high measurement sensitivity, can realize automatic measurement during the operation of the linear bearing, and can automatically analyze and process the measurement data.

Description of drawings

Fig. 1 is the front view of a linear bearing straightness measurement device based on the change of rotation angle of the present invention;

Fig. 2 is a side view of a linear bearing straightness measuring device based on a change in rotation angle of the present invention;

In the figure, 1—housing, 2—measuring rod, 3—gear, 4—magnetic head, 5—rotation angle detection element, 6—installation hole of measuring rod, 7—thrust spring, 8—linear movement guide groove, 9—limit Guide pin, 10—rack.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 and 2, a linear bearing straightness measuring device based on a change in rotation angle includes a housing 1, a measuring rod 2, a gear 3, a magnetic head 4, a rotation angle detection element 5 and a signal processor; in the housing 1 is provided with a measuring rod mounting hole 6, the measuring rod mounting hole 6 is a blind hole structure, the measuring rod 2 is installed in the measuring rod mounting hole 6, and the measuring rod 2 has a degree of freedom of linear movement in the measuring rod mounting hole 6 , a thrust spring 7 is connected between the tail end of the measuring rod 2 and the bottom of the measuring rod mounting hole 6; a linear movement guide groove 8 is provided on the surface of the rod body of the measuring rod 2, and the linear movement guide groove 8 and the measuring rod 2 are parallel; a limit guide pin 9 is fixed on the housing 1, and the end of the limit guide pin 9 extends into the linear movement guide groove 8, and the limit guide pin 9 cooperates with the linear movement guide groove 8. The degree of freedom of rotation of the measuring rod 2 is limited, and the linear movement range of the measuring rod 2 is limited; the gear 3 is arranged in the housing 1 on the side of the measuring rod 2, and the gear axis of the gear 3 is perpendicular to the measuring rod 2 , the gear 3 has a degree of freedom of rotation; a rack 10 is provided on the surface of the rod body of the measuring rod 2, and the gear 3 is meshed with the rack 10; the magnetic head 4 is fixed on the end of the gear shaft of the gear 3, and the rotation angle The detection element 5 is installed in the housing 1 and is set facing the magnetic head 4 , leaving a measurement gap between the magnetic head 4 and the rotation angle detection element 5 ; the signal output end of the rotation angle detection element 5 is electrically connected to the signal processor.

The magnetic head 4 is a cylindrical permanent magnet, and the magnetic head 4 is coaxially fixedly connected to the gear shaft of the gear 3 .

The magnetic head 4 has only one pair of N-S poles.

The rotation angle detecting element 5 adopts a giant magnetoresistance element or a three-axis Hall element.

Below in conjunction with accompanying drawing, the one-time use process of the present invention is illustrated:

Firstly, the casing 1 and the bearing seat of the linear bearing are firmly connected together to ensure that the tip of the measuring rod 2 vertically abuts against the guide rail of the linear bearing, and at the same time ensure that the thrust spring 7 has a certain amount of compression.

Next, make the bearing seat of the linear bearing move along the guide rail, and the measuring rod 2 will change its axial position synchronously with the movement of the bearing seat. In the process, due to the gear 3 and the rack 10 on the surface of the measuring rod 2 Mesh with each other, so the gear 3 will rotate forward or reversely, and during the rotation of the gear 3, the magnetic head 4 will also rotate synchronously with the gear 3, at this time, the rotation angle of the magnetic head 4 will be directly measured automatically through the rotation angle detection element 5 , and the rotation angle data measured by the rotation angle detection element 5 will be directly transmitted to the signal processor, and the signal processor will analyze and process the rotation angle data, and simultaneously convert it into straightness data.

The solutions in the embodiments are not intended to limit the scope of patent protection of the present invention, and all equivalent implementations or changes that do not deviate from the present invention are included in the patent scope of this case.

Claims (4)

1. A linear bearing straightness measuring device based on rotation angle variation, characterized in that: it comprises a housing, a measuring rod, a gear, a magnetic head, a rotation angle detection element and a signal processor; a measuring rod mounting hole is provided in the housing, The mounting hole of the measuring rod is a blind hole structure. The measuring rod is installed in the mounting hole of the measuring rod. The measuring rod has a degree of freedom of linear movement in the mounting hole of the measuring rod. A thrust spring is connected between them; a linear movement guide groove is provided on the surface of the rod body of the measuring rod, and the linear movement guide groove is parallel to the measuring rod; a limit guide pin is fixed on the housing, and the end of the limit guide pin The part extends into the linear movement guide groove, through the cooperation of the limit guide pin and the linear movement guide groove, the degree of freedom of rotation of the measuring rod is limited, and the linear movement range of the measuring rod is limited; the gear is arranged on the side of the measuring rod In the square housing, the gear shaft of the gear is perpendicular to the measuring rod, and the gear has a degree of freedom of rotation; a rack is provided on the surface of the rod body of the measuring rod, and the gear and the rack are meshed; the magnetic head is fixed on the gear of the gear At the end of the shaft, the rotation angle detection element is installed in the housing and is set facing the magnetic head, leaving a measurement gap between the magnetic head and the rotation angle detection element; the signal output end of the rotation angle detection element is electrically connected to the signal processor. 2 . The linear bearing straightness measuring device based on the change of rotation angle according to claim 1 , wherein the magnetic head is a cylindrical permanent magnet, and the magnetic head and the gear shaft of the gear are coaxially fixedly connected. 3 . 3 . The linear bearing straightness measuring device based on the change of rotation angle according to claim 2 , wherein the magnetic head only has a pair of N-S poles. 4 . 4 . The linear bearing straightness measurement device based on the change of rotation angle according to claim 1 , wherein the rotation angle detection element is a giant magnetoresistance element or a three-axis Hall element.