Flexible connection structure and flash tester objective table

Abstract

The invention provides a flexible connection structure which comprises a lead screw, an axial push block connected to the lead screw and a globe roof installation connection block, a groove with an elastic globe roof structure is formed in the globe roof installation connection block, at least part of the axial push block is inserted into the groove, the elastic globe roof structure is in point contact with the two sides of the axial push block, and the elastic globe roof structure is in point contact with the two sides of the axial push block. The elastic ball top structure comprises a first point contact mechanism and a second point contact mechanism which are located on the two sides of the groove, the first point contact mechanism is an elastic point contact mechanism and comprises an elastic ball head plunger, the elastic ball head plunger comprises an elastic telescopic ball head, and the second point contact mechanism is a rigid point contact mechanism and comprises a ball push rod. The ball push rod comprises a rigid fixed ball head, and the two sides of the axial push block are in point contact with the first point contact mechanism and the second point contact mechanism respectively. The invention also provides an objective table. The objective table has the beneficial effect that the influence of transmission external force of the motion shaft of the objective table is well eliminated.

Description

[0001] This application is a divisional application of the patent application with the application date of September 29, 2020, application number 2020110551078, and invention name as a flexible connection structure of a screw and a flash tester carrier. Technical Field

[0002] The present invention relates to a lead screw, and in particular to a flexible connection structure and a flash tester loading platform. Background Art

[0003] With the advent of the Industrial 4.0 era and the continuous rapid development of precision machining and manufacturing technology, more and more products have increasingly stringent requirements for precision, 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 contour, coaxiality, position, roundness, angle and other form and position tolerances and three-dimensional dimensions to meet the increasingly rapidly changing product needs. Therefore, traditional measurement methods and tools, such as rulers, calipers, micrometers, micrometers 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, more advanced, more efficient and more accurate one-button flash testers have come into being.

[0004] The one-touch flash tester is a precision image dimensional measurement instrument with advantages over traditional imagers. It is primarily used for one-touch measurement of component dimensions and form tolerances, including two-dimensional dimensions, thickness, shape profile, coaxiality, position, and roundness. Based on the measurement principles of imagers, the flash tester utilizes a bi-telecentric high-resolution optical lens, combined with a high-precision image analysis algorithm and the one-touch flash measurement principle. In CNC mode, simply press the start button, and the instrument automatically locates the measurement object based on the workpiece shape, matches the template, performs measurement evaluation, and generates reports, truly achieving fast and accurate one-touch measurement.

[0005] In the field of image measurement, existing two-dimensional stages are bulky and not lightweight and concise. The stage production and assembly efficiency is low, and the manufacturing cycle is slightly long, which brings inconvenience to the rapid production of instruments in batches. Currently, the connection methods (existing technical solutions) of the screw and moving parts of the one-button flash tester stage on the market mainly include the following:

[0006] 1. The connection between the connecting seat of the stage transmission screw nut and the stage moving part is a rigid connection. Its advantages are simple structure and strong connection. However, its disadvantages are that the degree of freedom is limited when assembling the connecting seat of the screw nut and the moving part body. This requires high processing accuracy of the parts and also has certain difficulties in the assembly process of the screw transmission and the stage moving part.

[0007] 2. The connection between the platform drive screw nut connector and the platform's moving parts is an elastic connection. The main component of this elastic connection is the connector made of spring steel. The elasticity of the material itself is used to prevent the two degrees of freedom between the screw nut connector and the platform's moving parts from being completely restricted. Its advantage is that the assembly process requirements are lower than those of a rigid hard connection, and it is more reliable than a rigid hard connection. The disadvantage is that the spring steel material and thickness determine the degree of elasticity. Improper use can lead to a mismatch between the elasticity and the screw drive. Even if the rigidity is still there, the screw may still produce slight deflection during long-term movement, ultimately resulting in a change in the remote motion accuracy of the platform. Therefore, this elastic connection is, to some extent, a weakened rigid hard connection.

[0008] The shortcomings of the existing technical solutions are as follows:

[0009] 1) The connection structure is a rigid hard connection. The degree of freedom is limited when assembling the connection seat of the screw nut and the moving part body. This requires high processing accuracy of the parts and also has certain difficulties in the assembly process of the screw drive and the stage moving parts.

[0010] 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. The rigidity is still there, and 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

[0011] In order to solve the problems in the prior art, the present invention provides a flexible connection structure of a screw and a flash tester stage, which effectively eliminates the influence of external transmission force on the stage motion axis, making the stage motion accuracy stable and reliable in the long term.

[0012] The present invention provides a flexible connection structure of a screw, comprising a screw, a screw nut seat, a linear guide rail, an axial push block, a ball top mounting connection block and a worktable moving component, wherein the screw nut seat is mounted on the screw, the screw nut seat and the linear guide rail constitute a moving pair, the axial push block is mounted on the screw nut seat, the worktable 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 insert block, the insert 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 insert block.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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 are in point contact with the elastic telescopic ball head and the rigidly fixed ball head respectively.

[0017] 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.

[0018] 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.

[0019] As a further improvement of the present invention, except for point contact, the axial push block does not contact the spherical top mounting connection block.

[0020] 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.

[0021] The present invention also provides a flash tester stage, comprising the flexible connection structure of any one of the lead screws described above.

[0022] The beneficial effects of the present invention are as follows: through the above scheme, the flexible connection structure between the screw transmission and the moving parts is a point-contact flexible structure, which effectively eliminates the influence of external force on the transmission of the moving axis of the stage. Even if the screw is used for a long time and produces slight deflection deformation and thermal expansion and contraction deformation caused by the temperature of the screw, 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 operation of the stage, saving costs for the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present disclosure will now be explained in further detail, by way of example only, with reference to the accompanying drawings.

[0024] Figure 1 It is a schematic diagram of a flexible connection structure of a lead screw of the present invention.

[0025] Figure 2 yes Figure 1 A partial enlarged view of the . DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] like Figures 1 to 2 As shown, a flexible connection structure of a screw is mainly designed to design an elastic ball top structure with a groove on one side of the worktable moving part 1; a linear guide 3 is used as a moving guide on the screw transmission side, and an axial push block 7 fixed on the linear guide slider and a screw nut seat 6 are connected together and snapped into the elastic ball top structure with a groove to form a flexible connection structure, specifically including: 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 worktable moving part 1. 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 right end hole. The ball head plunger 5 has an elastic structure inside, and its ball head is a retractable ball head. The ball push rod 8 is installed opposite to the ball plunger 5 to form a grooved elastic ball top structure; in the screw drive structure, the screw nut seat 6 is fixed to the side of the axial push block 7, and the axial push block 7 is fixed to the side of the slider of the linear guide 3. Therefore, 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 insert block 61 is inserted into the grooved elastic ball top structure 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. The non-contact part of the axial push block 7 forms a gap of at least 1mm around the groove of the ball top mounting connection block 4. Adjusting 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 flat surface 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 and the movement axis of the screw drive are parallel.

[0028] 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.

[0029] The present invention also provides a flash tester stage, comprising the flexible connection structure of any one of the lead screws described above.

[0030] The flexible connection structure of a lead screw and a flash tester stage provided by the present invention have the following advantages:

[0031] 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.

[0032] 2) Even if the lead screw undergoes minor deflection and thermal expansion and contraction due to long-term use, the linearity, angular swing, and linear positioning accuracy of the stage are still not affected. This ensures the long-term stability and reliability of the stage's motion, thereby ensuring the instrument's measurement accuracy.

[0033] 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.

[0034] The flexible connection structure of the lead screw and the flash tester stage provided by the present invention can be used in the precision measurement industry, the automation equipment and measurement industry, the biomedical industry, etc.

[0035] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A flexible connection structure, characterized in that: It includes a lead screw, an axial push block connected to the lead screw, and a ball-top mounting connection block, the ball-top mounting connection block is provided with a groove with an elastic ball-top structure, at least a portion of the axial push block is inserted into the groove, and the elastic ball-top structure is in point contact with two sides of the axial push block, wherein the elastic ball-top structure includes a first point contact mechanism and a second point contact mechanism located on two sides of the groove, the first point contact mechanism is an elastic point contact mechanism and includes an elastic ball head plunger, the elastic ball head plunger includes an elastic telescopic ball head, the second point contact mechanism is a rigid point contact mechanism and includes a ball push rod, the ball push rod includes a rigid fixed ball head, and two sides of the axial push block are in point contact with the first point contact mechanism and the second point contact mechanism respectively.

2. The flexible connection structure according to claim 1, characterized in that: It also includes a stage moving component, which is installed on the ball-top mounting connection block, and the ball-top mounting connection block is fixed on the side of the stage moving component.

3. The flexible connection structure according to claim 1, characterized in that: It also includes a screw nut seat and a linear guide rail. The screw nut seat is installed on the screw. The screw nut seat and the linear guide rail form a moving pair. The axial push block is installed on the screw nut seat.

4. The flexible connection structure according to claim 1, characterized in that: The axial push block is provided with a protruding insert block, and the insert block is inserted into the groove with the elastic spherical top structure.

5. The flexible connection structure according to claim 1, characterized in that: The elastic ball head plunger is installed opposite to the ball push rod to form the elastic ball top structure. Except for point contact, the axial push block does not contact the ball top mounting connection block, and a gap of at least 1 mm is formed around the groove of the ball top mounting connection block at the non-contact part of the axial push block.

6. A flash tester stage, characterized in that: The invention comprises the flexible connection structure as claimed in any one of claims 1 to 5.

7. A flash tester stage, characterized in that: It includes a transmission structure, an axial push block, a ball-top mounting connection block and a stage moving component, the axial push block is mounted on the transmission structure, 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 a first point contact mechanism and a second point contact mechanism, the axial push block is provided with a raised plug block, the plug block is inserted into the groove having the first point contact mechanism and the second point contact mechanism, the two sides of the plug block are in point contact with the first point contact mechanism and the second point contact mechanism respectively, wherein the first point contact mechanism is an elastic point contact mechanism, and the second point contact mechanism is a rigid point contact mechanism.

8. The flash tester stage according to claim 7, characterized in that: The transmission structure is a lead screw and the flash tester stage also includes a lead screw nut seat and a linear guide rail. The lead screw nut seat is installed on the lead screw nut. The lead screw nut seat and the linear guide rail form a moving pair. The axial push block is installed on the lead screw nut seat.

9. The flash tester stage according to claim 8, characterized in that: The first point contact mechanism includes an elastic ball plunger, a spring or an air chuck. The elastic ball plunger includes an elastic telescopic ball head. The axis of the elastic ball plunger is parallel to the linear guide rail. There are two elastic ball plungers.

10. The flash tester stage according to claim 7, characterized in that: The second point contact mechanism comprises a ball push rod including a rigid fixed ball head.

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