A flexible connection structure of a lead screw and a flash tester stage

Abstract

The present invention provides a flexible connection structure of a lead screw, including a lead screw, a lead screw nut seat, a linear guide, an axial push block, a ball top mounting connection block and a stage moving component, wherein the lead screw nut seat is mounted on the lead screw, the lead screw nut seat and the linear guide form a moving pair, the axial push block is mounted on the lead screw nut seat, the stage moving component is mounted on the ball top mounting connection block, the ball top mounting connection block is provided with a groove having an elastic ball top structure, the axial push block is provided with a raised plug block, the plug block is inserted into the groove having an elastic ball top structure, and the elastic ball top structure is in point contact with both sides of the plug block. The present invention also provides a flash tester stage. The beneficial effects of the present invention are: the influence of external transmission force on the stage moving axis is better eliminated.

Description

Technical Field

[0001] The invention relates to a lead screw, and in particular to a flexible connection structure of the lead screw and a flash tester loading platform. Background Art

[0002] With the advent of the Industrial 4.0 era and the rapid development of precision machining and manufacturing technology, more and more products have increasingly stringent requirements for accuracy, more and more diversified measurement requirements for products, and higher and higher measurement efficiency requirements for products. Many products not only require the measurement of simple two-dimensional dimensions, but also require fast and efficient measurement of product contours, coaxiality, position, roundness, angles and other form and position tolerances and three-dimensional dimensions to meet the rapidly changing product needs. Therefore, traditional measurement methods and tools, such as rulers, calipers, micrometers, micrometer indicators and other measuring tools, and even traditional imagers, have limited measurement ranges and methods. They may not be able to measure many products, and the measurement efficiency cannot keep up. They can no longer meet the requirements of product accuracy and form and position tolerance measurement. In order to solve the detection of some complex product geometries, a more advanced, efficient and accurate one-button flash tester has emerged.

[0003] The one-button flash tester is an image dimension precision measuring instrument with more advantages than traditional imagers. It is mainly used for one-button measurement of dimensions and form tolerances such as two-dimensional dimensions, thickness dimensions, shape profile, coaxiality, position, roundness, etc. of parts. Based on the measurement principle of imagers, the flash tester adopts a dual telecentric high-resolution optical lens, combined with a high-precision image analysis algorithm, and incorporates the one-button flash measurement principle. In CNC mode, just press the start button, and the instrument can automatically locate the measurement object, match the template, measure and evaluate, and generate reports according to the shape of the workpiece, truly realizing one-button fast and accurate measurement.

[0004] In the field of image measurement, the existing two-dimensional stage has a bulky structure, is not light and concise enough, has a low production and assembly efficiency, and has a slightly longer manufacturing cycle, which brings inconvenience to the rapid realization of batch production of instruments. Currently, there are mainly the following ways to connect the lead screw and the moving parts of the one-button flash tester stage on the market (existing technical solutions):

[0005] 1. The connection between the connecting seat of the stage transmission screw nut and the stage moving part is a rigid hard connection, which has the advantages of simple structure and firm connection. The disadvantage is that the connection seat of the screw nut and the moving part body are limited in freedom when assembled, and the processing accuracy of the parts is high. There is also a certain degree of difficulty in the assembly process of the screw transmission and the stage moving parts;

[0006] 2. The connection between the connection seat of the stage transmission lead screw nut and the stage moving part is an elastic connection. The main component of this elastic connection is the connection piece made of spring steel material. The elasticity of the material itself is used to prevent the two degrees of freedom between the lead screw nut connection seat and the stage moving part from being completely restricted. Its advantage is that the assembly process requirements are lower than those of rigid hard connections, and it has higher reliability than rigid hard connections. The disadvantage is that the spring steel material and thickness determine the elasticity. Improper use will lead to improper matching between elasticity and lead screw transmission, especially rigidity. The lead screw may still produce slight deflection deformation during long-term movement, which eventually leads to changes in the remote motion accuracy of the stage. Therefore, this elastic connection, to some extent, is a weakened rigid hard connection.

[0007] The disadvantages of the prior art solutions are as follows:

[0008] 1) The connection structure is a rigid connection. The connection seat of the screw nut and the moving part body are limited in freedom during assembly. The machining accuracy of the parts is high, and the assembly process requirements for the screw drive and the stage moving parts are also difficult.

[0009] 2) The connection structure is an elastic hard connection. The elasticity is determined by the spring steel material and thickness. Improper use will lead to improper matching between the elasticity and the screw drive, especially the rigidity. The screw may still produce slight deflection during long-term movement, which will eventually lead to changes in the remote motion accuracy of the stage. Summary of the invention

[0010] In order to solve the problems in the prior art, the present invention provides a flexible connection structure of a lead screw and a flash tester stage, which effectively eliminates the influence of external transmission force on the moving axis of the stage, so that the movement accuracy of the stage is stable and reliable for a long time.

[0011] The present invention provides a flexible connection structure of a lead screw, comprising a lead screw, a lead screw nut seat, a linear guide rail, an axial push block, a ball top mounting connection block and a stage moving component, wherein the lead screw nut seat is mounted on the lead screw, the lead screw nut seat and the linear guide rail constitute a moving pair, the axial push block is mounted on the lead screw nut seat, the stage moving component is mounted on the ball top mounting connection block, the ball top mounting connection block is provided with a groove having an elastic ball top structure, the axial push block is provided with a raised plug block, the plug block is inserted into the groove having the elastic ball top structure, and the elastic ball top structure is in point contact with both sides of the plug block.

[0012] As a further improvement of the present invention, the force transmission direction between the elastic spherical top structure and the insert block is parallel to the linear guide rail.

[0013] As a further improvement of the present invention, the elastic dome structure includes a first point contact mechanism and a second point contact mechanism located on both sides of the groove, and both sides of the insert block are in point contact with the first point contact mechanism and the second point contact mechanism respectively.

[0014] As a further improvement of the present invention, the first point contact mechanism is an elastic point contact mechanism, and the second point contact mechanism is a rigid point contact mechanism.

[0015] As a further improvement of the present invention, the first point contact mechanism includes an elastic ball head plunger, the elastic ball head plunger includes an elastic telescopic ball head, the second point contact mechanism includes a ball push rod, the ball push rod includes a rigidly fixed ball head, and the two sides of the insert block are in point contact with the elastic telescopic ball head and the rigidly fixed ball head respectively.

[0016] As a further improvement of the present invention, the axes of the elastic ball head plunger and the ball push rod are parallel to the linear guide rail, there are two elastic ball head plungers and one ball push rod, and the point contacts formed between the two sides of the plug block and the two elastic telescopic ball heads and one rigid fixed ball head are distributed in an isosceles triangle.

[0017] As a further improvement of the present invention, the elastic ball head plunger is installed on the ball top mounting connection block through a moving and positioning structure.

[0018] As a further improvement of the present invention, except for point contact, the axial push block does not contact the ball top mounting connection block.

[0019] As a further improvement of the present invention, the axial push block is L-shaped, the insert block is a vertical part, the transverse part is a base, and a gap is provided between the base and the ball top mounting connection block.

[0020] The present invention also provides a flash tester stage, comprising the flexible connection structure of the lead screw as described in any one of the above.

[0021] The beneficial effects of the present invention are as follows: through the above scheme, the flexible connection structure between the lead screw transmission and the moving parts is a point-contact flexible structure, which effectively eliminates the influence of the external force on the transmission of the moving axis of the stage. Even if the lead screw is used for a long time and produces a slight deflection deformation and thermal expansion and contraction deformation caused by the temperature, it can still ensure that the moving straightness accuracy, moving angular swing accuracy, and linear positioning accuracy of the stage are not affected, so that the long-term movement accuracy of the stage is stable and reliable, thereby ensuring the measurement accuracy of the instrument. On the other hand, it can also reduce the difficulty of production and assembly and the difficulty of the process, shorten the manufacturing cycle, and efficiently complete the batch production of the stage, saving costs for the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a schematic diagram of a flexible connection structure of a lead screw of the present invention.

[0023] Figure 2 yes Figure 1 A is a partial enlarged view of the DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0025] like Figure 1 to Figure 2 As shown, a flexible connection structure of a screw is mainly designed with an elastic ball top structure with a groove on one side of the stage moving part 1; a linear guide 3 is used as a moving guide on the side of the screw transmission, and an axial push block 7 fixed on the linear guide slider and a screw nut seat 6 are connected and snapped into the elastic ball top structure with a groove to form a flexible connection structure, which specifically includes: a ball top mounting connection block 4, a ball head plunger 5, a screw nut seat 6, an axial push block 7, and a ball push rod 8. The ball top mounting connection block 4 is fixed to the side of the stage moving part 1, and two ball head plungers 5 are installed on the left end of the ball top mounting connection block 4, and a ball push rod 8 is fastened in the hole on the right end. Because the ball head plunger 5 has an elastic structure inside, its ball head is not a retractable ball head, and the ball push rod 8 is installed opposite to the ball plunger 5 to form an elastic ball top structure with grooves; in the structure of the screw drive, the screw nut seat 6 is fixed on the side of the axial push block 7, and the axial push block 7 is fixed on the side of the slider of the linear guide 3, so the axial push block 7 can move left and right due to the screw drive, the axial push block 7 is L-shaped, and the plug block 61 is inserted into the elastic ball top structure with grooves to form a flexible connection structure. The axial push block 7 is in point contact with the ball plunger 5 and the ball push rod 8 respectively, and the non-contact part of the axial push block 7 forms a gap of at least 1mm around the groove of the ball top installation connection block 4. The installation position of the ball plunger 5 can also adjust the clamping force of the axial push block. During the screw drive process, the axial push block 7 pushes the stage moving component 1 to move and position. Technical points: one end is an elastic ball top, and the elastic ball top can adjust the size of the elastic force; the other end is a rigid ball top. Due to the force of the elastic ball top, a plane of the axial push block 7 is in close contact with the rigid ball top and never separates. Since the two side surfaces of the axial push block 7 are in point contact with the top of the elastic ball and the top of the rigid ball respectively, the movement accuracy of the stage will not change regardless of whether the movement axis of the stage moving part is parallel to the movement axis of the screw drive.

[0026] In the structure, the elastic ball top can be other types, such as spring pieces, air chucks, etc. The screw drive can be a polished rod friction drive, a gear rack drive, a belt drive, etc.

[0027] The present invention also provides a flash tester stage, comprising the flexible connection structure of the lead screw as described in any one of the above.

[0028] The flexible connection structure of a lead screw and a flash tester stage provided by the present invention have the following improvements:

[0029] 1) The present invention eliminates the influence of external forces on the moving axis of the stage, and at the same time reduces the parallelism installation requirements between the moving axis of the moving parts of the stage and the moving axis of the screw drive. It has a modular design, low requirements on the precision of parts, low manufacturing cost, and is easy to implement.

[0030] 2) Even if the lead screw is used for a long time and produces a small deflection deformation and thermal expansion and contraction caused by the temperature, the linearity accuracy, angular swing accuracy and linear positioning accuracy of the stage are still not affected, making the long-term movement accuracy of the stage stable and reliable, thereby ensuring the measurement accuracy of the instrument;

[0031] 3) The processing requirements and assembly difficulty are reduced, the batch production and assembly of the stage itself are more stable, the delivery cycle of the whole machine is shortened, and costs are saved for the enterprise.

[0032] The flexible connection structure of a lead screw and a flash tester stage provided by the present invention can be used in the precision measurement industry, automation equipment and measurement industry, biomedical industry, etc.

[0033] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A flexible connection structure of a lead screw, characterized in that: It includes a lead screw, a lead screw nut seat, a linear guide rail, an axial push block, a ball top mounting connection block and a stage moving component, wherein the lead screw nut seat is mounted on the lead screw, the lead screw nut seat and the linear guide rail form a moving pair, the axial push block is mounted on the lead screw nut seat, the lead screw nut seat is fixed to the side of the axial push block, the stage moving component is mounted on the ball top mounting connection block, the ball top mounting connection block is provided with a groove with an elastic ball top structure, the axial push block is provided with a raised plug block, the plug block is inserted into the groove with the elastic ball top structure, the elastic ball top structure is in point contact with both sides of the plug block, wherein, The elastic dome structure includes a first point contact mechanism and a second point contact mechanism located on both sides of the groove, and both sides of the plug block are in point contact with the first point contact mechanism and the second point contact mechanism respectively, the first point contact mechanism is an elastic point contact mechanism, and the second point contact mechanism is a rigid point contact mechanism. The first point contact mechanism includes an elastic ball plunger, which includes an elastic telescopic ball plunger. The second point contact mechanism includes a ball push rod, which includes a rigid fixed ball head. Both sides of the plug block are in point contact with the elastic telescopic ball head and the rigid fixed ball head respectively.

2. The flexible connection structure of the lead screw according to claim 1, characterized in that: The force transmission direction between the elastic ball top structure and the insert block is parallel to the linear guide rail.

3. The flexible connection structure of the lead screw according to claim 1, characterized in that: The axes of the elastic ball head plunger and the ball push rod are parallel to the linear guide rail. There are two elastic ball head plungers and one ball push rod. The point contacts formed between the two sides of the plug block and the two elastic telescopic ball heads and the one rigid fixed ball head are distributed in an isosceles triangle.

4. The flexible connection structure of the lead screw according to claim 1, characterized in that: The elastic ball head plunger is installed on the ball top mounting connection block through a moving and positioning structure.

5. The flexible connection structure of the lead screw according to claim 1, characterized in that: Except for point contact, the axial push block does not contact the ball top mounting connection block.

6. The flexible connection structure of the lead screw according to claim 1, characterized in that: The axial push block is L-shaped, the insert block is a vertical part, the transverse part is a base, and a gap is provided between the base and the ball top mounting connection block.

7. A flash tester stage, characterized in that: A flexible connection structure comprising a lead screw as claimed in any one of claims 1 to 6.

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