阅读说明：本技术 误差测量装置及具有其的丝杆组件 (Error measuring device and screw rod assembly with same ) 是由 杨博会 吕鹤 张博 刘代伟 于 2020-12-16 设计创作，主要内容包括：本发明提供了一种误差测量装置及具有其的丝杆组件。误差测量装置,用于对丝杆进行测量,丝杆上设置有安装腔,其特征在于,误差测量装置包括：弹性件,弹性件用于设置在安装腔内并沿丝杆的轴向延伸,弹性件与丝杆连接,以在丝杆变形时带动弹性件变形；测量组件,测量组件与弹性件连接,以根据弹性件的变形量得出丝杆的变形量。由于本发明仅利用弹性件与测量组件就可以得出丝杆的变形量,无需额外增加其他的模块,成本较低,安装方便,解决了现有技术中的测量数控机床的滚珠丝杆的方式较为复杂的问题。(The invention provides an error measuring device and a screw rod assembly with the same. Error measuring device for measure the lead screw, be provided with the installation cavity on the lead screw, its characterized in that, error measuring device includes: the elastic piece is arranged in the mounting cavity and extends along the axial direction of the screw rod, and the elastic piece is connected with the screw rod so as to drive the elastic piece to deform when the screw rod deforms; and the measuring assembly is connected with the elastic piece so as to obtain the deformation of the screw rod according to the deformation of the elastic piece. According to the invention, the deformation of the screw rod can be obtained only by using the elastic part and the measuring assembly, other modules are not required to be additionally added, the cost is lower, the installation is convenient, and the problem that the method for measuring the ball screw rod of the numerical control machine tool in the prior art is complex is solved.)

1. An error measuring device for measuring a screw (210), the screw (210) being provided with a mounting cavity (230), the error measuring device comprising:

the elastic piece (110) is arranged in the mounting cavity (230) and extends along the axial direction of the screw rod (210), and the elastic piece (110) is connected with the screw rod (210) so as to drive the elastic piece (110) to deform when the screw rod (210) deforms;

the measuring assembly is connected with the elastic piece (110) so as to obtain the deformation of the screw rod (210) according to the deformation of the elastic piece (110).

2. The error measurement device of claim 1, wherein the measurement assembly comprises:

the pointer (121) is arranged on the elastic part (110) and drives the pointer to move along the axial direction of the screw rod (210) when the elastic part (110) stretches and contracts;

the pointer (121) is in contact with the sliding rheostat (122), and the pointer (121) and the sliding rheostat (122) are located in the same measuring circuit so as to obtain the deformation amount of the lead screw (210) according to the current change in the measuring circuit.

3. Error measuring device according to claim 2, characterized in that the slide rheostat (122) is bar-shaped, the slide rheostat (122) extending in axial direction of the screw (210).

4. The error measurement device of claim 2, further comprising:

the current amplifier (140) is installed on the measuring circuit, and the current amplifier (140) is used for converting the current amplified by the current amplifier (140) to obtain the deformation of the screw rod (210).

5. The error measurement device of claim 4, further comprising:

a wireless transmission module (130), wherein the wireless transmission module (130) is arranged on the measuring circuit and is connected with the current amplifier (140) in series, so that the obtained deformation of the screw rod (210) is output through the wireless transmission module (130).

6. The error measurement device of claim 5, further comprising:

the power supply (150), the power supply (150) sets up on the measuring circuit, power supply (150), current amplifier (140) and wireless transmission module (130) are connected in series in proper order.

7. The error measurement device of claim 6, wherein the power supply (150), the current amplifier (140), and the wireless transmission module (130) are all mounted within the mounting cavity (230).

8. The error measurement device of claim 1, wherein the measurement assembly comprises:

the pointer (121) is arranged on the elastic part (110) and drives the pointer to move along the axial direction of the screw rod (210) when the elastic part (110) stretches and contracts;

the measuring scale is arranged on the measuring scale, and the pointer (121) points to the measuring scale so as to obtain the deformation of the screw rod (210) according to the matching of the pointer (121) and the measuring scale.

9. The error measurement device of claim 1, wherein the measurement assembly comprises:

the elastic piece (110) is pressed on the pressure sensor, so that the deformation of the screw rod (210) is obtained through the pressure change measured by the pressure sensor.

10. A lead screw assembly (20), comprising:

the end part of the screw rod (210) is provided with a mounting groove;

a cover plate (220), wherein the cover plate (220) is installed at the installation groove of the screw rod (210), so that the installation groove and the inner wall surface of the cover plate (220) form the installation cavity (230);

the error measuring device of any of claims 1 to 9, mounted within the mounting cavity (230).

Technical Field

The invention relates to the field of numerical control machining, in particular to an error measuring device and a screw rod assembly with the same.

Background

The numerical control machine tool industry is the center of gravity for the development of the equipment manufacturing industry, and the manufacturing industry puts higher requirements on the precision of the numerical control machine tool. The thermal error caused by the deformation of machine tool parts caused by thermal factors in the machining process is the most important factor influencing the precision and accounts for 40-70% of the comprehensive error in the whole machining process.

The ball screw of digit control machine tool is often under the operating mode of high-speed motion, and the friction condition is comparatively serious. The heating value is large, the temperature is increased, and the positioning precision is reduced, so that the thermal error measurement of the screw rod is needed to perform further error compensation.

At present, a common thermal error measuring device measures thermal errors based on laser, and the method needs to additionally increase more modules, so that the structural complexity and the maintenance cost of a machine tool are increased. Secondly, a position sensor is arranged to measure the thermal error, the method cannot detect the thermal error of the screw rod in real time, and wiring is complex.

Disclosure of Invention

The invention mainly aims to provide an error measuring device and a screw rod assembly with the same, and aims to solve the problem that the method for measuring the ball screw of a numerical control machine tool in the prior art is complex.

In order to achieve the above object, according to one aspect of the present invention, there is provided an error measuring device for measuring a lead screw on which a mounting cavity is provided, the error measuring device including: the elastic piece is arranged in the mounting cavity and extends along the axial direction of the screw rod, and the elastic piece is connected with the screw rod so as to drive the elastic piece to deform when the screw rod deforms; and the measuring assembly is connected with the elastic piece so as to obtain the deformation of the screw rod according to the deformation of the elastic piece.

Further, the measurement assembly includes: the pointer is arranged on the elastic piece and drives the pointer to move along the axial direction of the screw rod when the elastic piece stretches; and the pointer and the sliding rheostat are positioned in the same measuring circuit so as to obtain the deformation of the screw rod according to the current change in the measuring circuit.

Further, the slide rheostat is in a strip shape and extends along the axial direction of the screw rod.

Further, the error measuring apparatus further includes: and the current amplifier is arranged on the measuring circuit and converts the current amplified by the current amplifier to obtain the deformation of the screw rod.

Further, the error measuring apparatus further includes: and the wireless transmission module is arranged on the measuring circuit and is connected with the current amplifier in series so as to output the obtained deformation of the screw rod through the wireless transmission module.

Further, the error measuring apparatus further includes: the power supply, the power setting is on measuring circuit, and power, current amplifier and wireless transmission module connect in series in proper order.

Further, the power supply, the current amplifier and the wireless transmission module are all installed in the installation cavity.

Further, the measurement assembly includes: the pointer is arranged on the elastic piece and drives the pointer to move along the axial direction of the screw rod when the elastic piece stretches; the dipperstick sets up the measurement scale on the dipperstick, and the pointer points to the measurement scale to according to the pointer and the cooperation that measures the scale obtain the deflection of lead screw.

Further, the measurement assembly includes: and the elastic piece is pressed on the pressure sensor, so that the deformation of the screw rod is obtained through the pressure change measured by the pressure sensor.

According to another aspect of the present invention, there is provided a lead screw assembly including: the end part of the screw rod is provided with a mounting groove; the cover plate is arranged at the mounting groove of the screw rod, so that a mounting cavity is formed by the mounting groove and the inner wall surface of the cover plate; in the error measuring device, the error measuring device is arranged in the mounting cavity.

By applying the technical scheme of the invention, the error measuring device is placed in the mounting cavity of the screw rod, and the screw rod is measured by using the error measuring device. According to the error measuring device, the elastic piece is connected with the screw rod, the elastic piece can drive the elastic piece to deform when the screw rod deforms, and the measuring assembly is connected with the elastic piece, so that the deformation of the screw rod can be obtained according to the deformation of the elastic piece when the elastic piece deforms. According to the invention, the deformation of the screw rod can be obtained only by using the elastic part and the measuring assembly, other modules are not required to be additionally added, the cost is lower, the installation is convenient, and the problem that the method for measuring the ball screw rod of the numerical control machine tool in the prior art is complex is solved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, 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 view showing a structure of a screw of a numerical control machine tool equipped with an error measuring device according to an embodiment of the present invention;

fig. 2 shows a partially enlarged view of a screw rod a of a numerically controlled machine tool equipped with an error measuring device according to an embodiment of the present invention; and

fig. 3 shows a schematic diagram of an error measuring device according to an embodiment of the invention.

Wherein the figures include the following reference numerals:

110. an elastic member; 121. a pointer; 122. a slide rheostat; 130. a wireless transmission module; 140. a current amplifier; 150. a power source; 20. a screw assembly; 210. a screw rod; 220. a cover plate; 230. and (7) installing a cavity.

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 embodiments with reference to the attached drawings.

Referring to fig. 1 to 3, the present invention provides an error measuring apparatus. The error measuring device is used for measuring the screw rod 210, and the screw rod 210 is provided with an installation cavity 230. The error measuring device includes an elastic member 110 and a measuring assembly. The elastic member 110 is disposed in the mounting cavity 230 and extends in an axial direction of the screw 210, and the elastic member 110 is connected to the screw 210 to drive the elastic member 110 to deform when the screw 210 deforms. The measuring assembly is connected with the elastic member 110 to obtain the deformation amount of the screw rod 210 according to the deformation amount of the elastic member 110.

According to the error measuring device, the elastic piece 110 is connected with the screw rod 210, the elastic piece 110 drives the elastic piece 110 to deform when the screw rod 210 deforms, and therefore the deformation of the screw rod 210 can be obtained according to the deformation of the elastic piece 110. According to the invention, the deformation of the screw 210 can be obtained only by using the elastic part 110 and the measuring component, no other module is required to be additionally added, the cost is lower, the installation is convenient, and the problem that the method for measuring the ball screw 210 of the numerical control machine tool in the prior art is complex is solved.

Fig. 1 shows a schematic structural view of a screw 210 of a numerical control machine tool equipped with an error measuring apparatus according to one embodiment of the present invention. Fig. 2 shows a partially enlarged view of a screw 210 of a numerical control machine tool equipped with an error measuring device according to one embodiment of the present invention. Referring to fig. 1 and 2, the measuring assembly includes a pointer 121 and a sliding rheostat 122. The pointer 121 is disposed on the elastic member 110, so as to drive the pointer 121 to move along the axial direction of the screw rod 210 when the elastic member 110 stretches. The pointer 121 is in contact with the slide rheostat 122, and the pointer 121 and the slide rheostat 122 are located in the same measuring circuit so as to obtain the deformation amount of the screw rod 210 according to the current change in the measuring circuit.

In the present embodiment, as shown in fig. 2, the slide rheostat 122 is in a bar shape, and the slide rheostat 122 extends along the axial direction of the lead screw 210 to facilitate reading.

The error measurement device further comprises a current amplifier 140. The current amplifier 140 is installed on the measuring circuit to obtain the deformation of the screw 210 by converting the current amplified by the current amplifier 140. The current amplifier 140 is provided to increase readability to accurately obtain the amount of deformation of the lead screw 210.

The error measuring apparatus further includes a wireless transmission module 130. The wireless transmission module 130 is disposed on the measurement circuit and connected in series with the current amplifier 140 to output the resulting deformation amount of the lead screw 210 through the wireless transmission module 130. Through wireless transmission data, adapt to various rotational speed conditions, and make things convenient for the reading.

The error measurement device also includes a power supply 150. The power supply 150 is arranged on the measuring circuit, and the power supply 150, the current amplifier 140 and the wireless transmission module 130 are connected in series in sequence.

The power supply 150, the current amplifier 140 and the wireless transmission module 130 are all installed in the installation cavity 230. The error measuring device needs few parts and is completely installed in the screw rod 210, the integration level is high, and the thermal deformation of the machine tool screw rod 210 can be accurately measured in real time.

The measuring assembly includes a pointer 121 and a measuring ruler. The pointer 121 is disposed on the elastic member 110, so as to drive the pointer 121 to move along the axial direction of the screw rod 210 when the elastic member 110 stretches. The measuring scale is arranged on the measuring scale, and the pointer 121 points to the measuring scale so as to obtain the deformation of the screw rod 210 according to the matching of the pointer 121 and the measuring scale.

The measurement assembly includes a pressure sensor. The elastic member 110 is pressed against the pressure sensor to obtain the deformation of the screw 210 according to the pressure change measured by the pressure sensor.

In the first embodiment, when the screw 210 rotates at a high speed and is thermally deformed, the elastic member 110 is elastically deformed, and the pointer 121 disposed on the elastic member 110 is driven to move along the axial direction of the screw 210. Since the pointer 121 is in contact with the sliding rheostat 122, and the pointer 121 and the sliding rheostat 122 are located in the same measuring circuit, the deformation amount of the lead screw 210 can be obtained according to the current change in the measuring circuit.

In the second embodiment, when the screw rod 210 rotates at a high speed and is thermally deformed, the elastic member 110 is elastically deformed, and the pointer 121 disposed on the elastic member 110 is driven to move along the axial direction of the screw rod 210. Since the pointer 121 is in contact with the sliding rheostat 122, and the pointer 121, the sliding rheostat 122 and the current amplifier 140 are located in the same measuring circuit, the deformation amount of the screw 210 can be obtained by converting the current amplified by the current amplifier 140.

In the third embodiment, when the screw rod 210 rotates at a high speed and is thermally deformed, the elastic member 110 is elastically deformed, and the pointer 121 disposed on the elastic member 110 is driven to move along the axial direction of the screw rod 210. Since the pointer 121 is in contact with the sliding rheostat 122, the pointer 121, the sliding rheostat 122, the wireless transmission module 130 and the current amplifier 140 are located in the same measuring circuit, and the wireless transmission module 130 is connected in series with the current amplifier 140, the obtained deformation amount of the lead screw 210 can be output through the wireless transmission module 130.

Fig. 3 shows a schematic diagram of an error measuring device according to an embodiment of the invention. Referring to fig. 3, the pointer 121 is in contact with the sliding rheostat 122, the pointer 121, the sliding rheostat 122, the wireless transmission module 130, the current amplifier 140 and the power supply 150 are located in the same measuring circuit, and the wireless transmission module 130 is connected in series with the current amplifier 140, so that the obtained deformation amount of the lead screw 210 can be output through the wireless transmission module 130.

In the fourth embodiment, when the screw rod 210 rotates at a high speed and is thermally deformed, the elastic member 110 is elastically deformed, and the pointer 121 disposed on the elastic member 110 is driven to move along the axial direction of the screw rod 210. The pointer 121 points to the measurement scale on the measuring scale, so the deformation of the screw rod 210 can be obtained according to the matching of the pointer 121 and the measurement scale.

In the fifth embodiment, when the screw 210 is rotated at a high speed and thermally deformed, the elastic member 110 pressed on the pressure sensor is elastically deformed, so that the deformation of the screw 210 can be obtained by the pressure change measured by the pressure sensor.

The screw assembly 20 according to an embodiment of the present invention includes a screw 210, a cover plate 220, and the error measuring device described above. The end of the screw 210 is provided with a mounting groove. The cap plate 220 is mounted at the mounting groove of the screw 210 such that the mounting groove and the inner wall surface of the cap plate 220 form a mounting cavity 230. The error measuring device is installed in the installation cavity 230.

In some embodiments, one end of the screw 210 of the machine tool is blind, one section of the elastic element 110 is connected to the bottom wall of the blind, and the other end of the elastic element 110 is connected to the cover plate 220 of the elastic assembly. The pointer 121 is disposed at a middle position of the elastic member 110, so that when the elastic member 110 expands and contracts, the pointer 121 is driven to move along an axial direction of the screw rod 210. One end of the slide rheostat 122 is fixed on the bottom wall of the blind hole of the screw rod 210, the pointer 121 and the slide rheostat 122 are positioned in the same measuring circuit, and different resistance values are output when the pointer 121 is in contact with different positions of the slide rheostat 122. The power supply 150, the current amplifier 140 and the radio transmission module are fixed on the side of the blind hole of the screw 210.

In some embodiments, the screw 210 is thermally deformed when rotating at a high speed, the elastic element 110 is tensioned, and the pointer 121 on the elastic element 110 moves along the axial direction of the screw 210, thereby changing the resistance of the sliding rheostat 122 and further changing the value of the current in the measuring circuit. Readability is increased after the current amplifier 140 is passed through, and reading is facilitated through the wireless transmission module 130. And calculating the deformation according to the parameters of the slide rheostat 122 through the obtained current change value, and calculating the thermal deformation value of the whole lead screw 210 through the proportional relation between the depth of the blind hole and the length of the whole lead screw 210.

The real-time thermal error measuring device for the machine tool screw 210 in the embodiment is low in cost, does not need to be provided with an additional sensor, is convenient to install, and does not need complex wiring because data is transmitted wirelessly. The thermal error of the screw rod 210 in the operation process of the machine tool can be measured in real time on line, the data processing is simple, and the economic benefit is high.

In the description herein, reference to the description of the terms "some embodiments," or "in a first implementation," or "in a second implementation," or "in a third implementation," or "in a fourth implementation," or "in a fifth implementation" means that a particular feature, structure, material, or characteristic described in connection with the embodiments or examples is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. And the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

the error measuring device in this embodiment is connected to the screw rod 210, and the elastic member 110 drives the elastic member 110 to deform when the screw rod 210 deforms, and since the measuring component is connected to the elastic member 110, when the elastic member 110 deforms, the deformation of the screw rod 210 can be obtained according to the deformation of the elastic member 110. According to the invention, the deformation of the screw 210 can be obtained only by using the elastic part 110 and the measuring assembly, other modules are not required to be additionally added, the cost is lower, the installation is convenient, and the problem that the method for measuring the ball screw 210 of the numerical control machine tool in the prior art is complex is solved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by 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.