Four-corner error adjusting mechanism and method for integrated porous flexible hinge

Abstract

The invention discloses a four-corner error adjusting mechanism and method for an integrated porous flexible hinge. The mechanism comprises a U-shaped groove with a threaded hole, wherein the U-shaped groove and a fulcrum connected with a hinge form a lever structure used for applying adjusting force to a hinge structure; the through hole screw is assembled in the threaded hole of the upper beam of the U-shaped groove, and the hard spring is used for applying an obliquely upward thrust to the hinge on the right side of the lever to adjust the position of a hinge knife edge; the inner hexagonal flat head screw penetrates through a through hole in the through hole screw, is assembled in a threaded hole of the lower beam of the U-shaped groove and is used for applying obliquely downward thrust to the hinge on the right side of the lever to adjust the position of a knife edge of the hinge. By adjusting the rotation angles of the two screws, the position of the hinge knife edge can be adjusted in the horizontal direction, and the four-corner error of the measured force of the parallel four-bar flexible hinge mechanism caused by the machining technology can be reduced to a certain extent.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of precision weight detection instruments, and particularly relates to a four-corner error adjustment mechanism and method for an integrated multi-hole flexible hinge. BACKGROUND

[0002] The integrated multi-hole flexible hinge is mainly applied to precision weight detection instruments, and is particularly widely applied to the field of electronic analytical balances. The working principle thereof is to realize accurate measurement of the weight of a measured object by precisely matching the gravity through electromagnetic force. Compared with a traditional strain gauge type electronic analytical balance, the electronic analytical balance manufactured by using the integrated flexible hinge has the advantages of extremely high resolution and sensitivity, and plays a crucial role in the field of precision weighing.

[0003] However, for the weighing link, the repeatability directly affects the accuracy of the weight measurement result. The main factor affecting the repeatability is the four-corner error. Due to the limitation of the processing technology level of the integrated flexible hinge, the knife edge positions of the parallelogram flexible hinge mechanism of the hinge cannot be completely flush, so that the displacement of the hinge is different for the same measured object loaded at different positions of the load end, and the mass obtained by matching the balance is also inconsistent. Macroscopically, the repeatability is poor, and the accuracy of the weighing result is difficult to guarantee. SUMMARY

[0004] The present application provides a four-corner error adjustment mechanism and method for an integrated multi-hole flexible hinge to solve the problem of poor weighing repeatability and difficult to guarantee the accuracy of the mass measurement result in the prior art to some extent.

[0005] In a first aspect, the present application provides a four-corner error adjustment mechanism for an integrated multi-hole flexible hinge, comprising:

[0006] a base body, which provides a lever fulcrum for connecting with a to-be-adjusted hinge;

[0007] a first adjustment assembly, which is installed on the base body in a first direction, and is used for applying a first elastic force to the lever fulcrum to make the to-be-adjusted hinge produce a first horizontal displacement;

[0008] a second adjustment assembly, which is installed on the base body in a second direction opposite to the first direction, and is used for applying a second elastic force to the lever fulcrum to make the to-be-adjusted hinge produce a second horizontal displacement opposite to the direction of the first horizontal displacement;

[0009] wherein, by selectively adjusting the elastic force size and direction of the first adjustment assembly and / or the second adjustment assembly, the horizontal micro-adjustment of the knife edge position of the to-be-adjusted hinge is realized to reduce the four-corner error.

[0010] In a preferred example, the base is a U-shaped groove, and the upper and lower beams of the U-shaped groove are respectively provided with threaded holes, and the lever fulcrum is connected by the open end of the U-shaped groove and the adjusting hinge.

[0011] In a preferred example, the first adjusting assembly comprises:

[0012] A through-hole screw is screwed to the upper beam.

[0013] An elastic member is compressed between the through-hole screw and the lower beam, and rotating the through-hole screw can change the compression amount of the elastic member, thereby adjusting the first elastic force.

[0014] In a preferred example, the second adjusting assembly comprises:

[0015] An internal hexagonal screw passes through the through-hole of the through-hole screw and is screwed to the lower beam, and rotating the internal hexagonal screw can directly or indirectly press the end of the upper beam to adjust the second elastic force.

[0016] In a preferred example, the elastic member is a hard spring, and the hard spring is sleeved on the outer periphery of the internal hexagonal screw and located between the through-hole screw and the lower beam.

[0017] In a second aspect, the present application provides a four-corner error adjustment method of an integrated multi-hole flexible hinge, which adopts the above mechanism and comprises the following steps:

[0018] a) A known mass is placed in the four corner positions of the hinge load end in turn, and the corresponding mass readings are obtained and recorded respectively;

[0019] b) According to the mass readings of the four corner positions, the front and back difference and the left and right difference are calculated to obtain the current four-corner error amount;

[0020] c) According to the front and back difference and the left and right difference, the first adjusting assembly and / or the second adjusting assembly are selectively adjusted to apply a horizontal micro displacement to the hinge blade position;

[0021] d) Repeat steps a) – c) until the front and back difference and the left and right difference converge to the allowable error range.

[0022] In a preferred example, in step b):

[0023] The mass readings of the adjacent two corner positions on the short side of the hinge load end are added to obtain a first sum and a third sum respectively, and the difference between them is taken as the left and right difference;

[0024] The mass readings of the adjacent two corner positions on the long side of the hinge load end are added to obtain a second sum and a fourth sum respectively, and the difference between them is taken as the front and back difference.

[0025] In a preferred example, in the step c) :

[0026] when the front-rear difference is greater than zero, rotate the inner hexagonal screw in the second adjustment assembly in a tightening direction; otherwise, rotate in a loosening direction; and / or

[0027] when the left-right difference is greater than zero, rotate the inner hexagonal screw in the second adjustment assembly in a loosening direction; otherwise, rotate in a tightening direction.

[0028] In a preferred example, if the front-rear difference and / or the left-right difference does not converge after repeating steps a) - c), then:

[0029] first, loosen the inner hexagonal screw of the second adjustment assembly to completely separate from the through-hole screw of the first adjustment assembly;

[0030] then, tighten the through-hole screw in a tightening direction until the elastic member is completely compressed;

[0031] then, adjust by rotating the through-hole screw until the difference converges.

[0032] In a preferred example, when adjusting with the through-hole screw:

[0033] if the front-rear difference is greater than zero, rotate the corresponding side through-hole screw in a loosening direction; otherwise, rotate in a tightening direction; and / or

[0034] if the left-right difference is greater than zero, rotate the corresponding side through-hole screw in a tightening direction; otherwise, rotate in a loosening direction.

[0035] The present application has the following beneficial effects: the present application has a simple structure, can compensate for the unevenness of the hinge knife edge position caused by the processing technology, reduce the force value difference exhibited by the hinge when loading the same load at different positions of the load end, and improve the weighing repeatability of the quality measurement instrument prepared based on the integrated flexible hinge. BRIEF DESCRIPTION OF DRAWINGS

[0036] The above and / or additional aspects and advantages of the present application will become apparent and be more fully understood from the following description, taken in conjunction with the accompanying drawings, wherein:

[0037] Figure 1 is a schematic diagram of a four-corner error adjustment mechanism for an integrated flexible hinge according to an embodiment of the present application;

[0038] Figure 2 is a schematic diagram of a hinge structure according to an embodiment of the present application;

[0039] Figure 3 is a plan view of a weight disc according to an embodiment of the present application;

[0040] Figure 4 A flow chart of a four-corner error adjustment method for an integrated flexible hinge according to an embodiment of the present application. DETAILED DESCRIPTION

[0041] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, in which the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are intended to explain the present application, and should not be understood as limiting the present application.

[0042] In view of the above-mentioned problem of the integrated porous flexible hinge that the four-corner error is large due to the machining preparation process and the repeatability is poor in the weighing measurement process, resulting in low reliability of the measurement result, the present application provides a four-corner error adjustment mechanism and method for an integrated porous flexible hinge.

[0043] The present application provides a four-corner error adjustment mechanism for an integrated flexible hinge, comprising:

[0044] The upper and lower cross beams have thread holes U-shaped grooves with different center alignment hole diameters (i.e. base body): and the hinge connection forms a lever for transmitting the horizontal force on the parallelogram flexible hinge;

[0045] Through-hole screw and hard spring (first adjustment assembly): used to apply an upward thrust to the upper cross beam, indirectly giving the hinge a horizontal force towards the load end, so that the hinge produces a small displacement towards the load end, adjusting the four-corner error caused by the position of the hinge knife edge deviating towards the load side;

[0046] Hexagonal screw (second adjustment assembly): used to apply a downward pressure to the upper cross beam, indirectly giving the hinge a horizontal force towards the other side of the load end, so that the hinge produces a small displacement towards the opposite direction of the load end, adjusting the four-corner error caused by the position of the hinge knife edge deviating towards the load end;

[0047] Specifically, Figure 1 A four-corner error adjustment mechanism for an integrated porous flexible hinge according to an embodiment of the present application.

[0048] As Figure 1 shown, the mechanism mainly includes: an integrated porous flexible hinge mechanism (such as Figure 2As shown, lever structures 6 and 9 are formed between the U-shaped groove and the parallel four-bar flexible hinge, through-hole adjusting screws 4 and 8, internal hexagonal flat-head adjusting screws 5 and 7, and a rectangular weight pan are assembled between the through-hole adjusting screw 4 and the lower beam 1 of the U-shaped groove, spring 2 and spring 11 symmetrical to it. The U-shaped groove structures on both sides form lever structures 6 and 9 with their respective connected hinges; through-hole adjusting screws 4 and 8 are respectively installed in the threaded holes of the upper crossbeams 3 and 10 of the U-shaped groove; the threaded parts of internal hexagonal flat-head adjusting screws 5 and 7 pass through the through holes of screws 4 and 8 and springs 2 and 11 and are installed in the threaded holes of the lower beam 1 of the U-shaped groove.

[0049] The U-shaped groove structure is used to apply horizontal displacement to the parallelogram hinge; the through-hole screw is used to apply vertical upward thrust to the upper crossbeam; the spring is used to provide elastic support between the through-hole screw and the lower crossbeam; and the hexagonal flat-head adjusting screw is used to apply vertical downward pressure to the upper crossbeam.

[0050] Furthermore, the U-shaped groove structure and the parallel four-bar hinge mechanism form a lever structure through the connection point, and the groove is placed on the opposite side of the load end with the U-shaped opening facing the opposite side of the load end.

[0051] Furthermore, the internal hexagonal flat-head adjusting screw is higher than the depth of the threaded hole in the upper crossbeam but lower than the distance from the top of the upper crossbeam to the top of the lower crossbeam.

[0052] Furthermore, the weight pan device has corresponding circular holes machined at the midpoints of its two short sides. These circular holes can be used to install square counterweights, which amplify the four-corner errors.

[0053] Furthermore, it also includes a controller device for acquiring the mass readings of weights loaded at different positions on the load end; the controller can adjust the magnitude of the electromagnetic force in real time according to the displacement detection device to balance the weight of the object being measured loaded on the load end, thereby acquiring the mass reading of the object being measured in real time.

[0054] Furthermore, the displacement detection device can convert the displacement of the hinge after the load end is loaded onto the object being measured into an electrical quantity with a linear relationship and feed it back to the controller device in real time.

[0055] The working principle of the four-corner error adjustment mechanism in the embodiments of this application is described in detail below, including:

[0056] When the through-hole adjusting screw 4, 8 is in precise fitting state with the inner hexagonal flat head adjusting screw 5, 7, the inner hexagonal flat head adjusting screw 5 or 7 will change the depth of the thread into the corresponding threaded hole of the U-shaped hole groove lower beam 1 according to the angle and direction of rotation, and the U-shaped hole groove upper beam 3 or 10 will be subjected to a vertical downward pressure to produce deformation, and the hinge connection of the U-shaped hole groove upper beam 3 and 10 forms an approximate lever structure, when the upper beam 3 or 10 deforms downward, the parallel four-bar flexible hinge will produce a small horizontal displacement in the opposite direction of the load, that is, the four-corner error caused by the deviation of the cutting edge position to the load end is adjusted.

[0057] When the inner hexagonal flat head adjusting screw 5, 7 is rotated to separate the screw nut from the screw nut of the through-hole adjusting screw 4, 8, the spring 2 and the spring 11 between the screw bottom and the lower beam will be gradually compressed, when the spring is compressed to the limit state and cannot be compressed further, continue to rotate the through-hole adjusting screw 4, 8, because the spring cannot be compressed at this time, with the rotation of the through-hole adjusting screw, the upper beam 3, 10 will gradually move upward, and the corresponding parallel four-bar flexible hinge structure will produce a small horizontal displacement in the direction of the load end, at this time, the four-corner error caused by the deviation of the cutting edge position to the beam is adjusted.

[0058] As shown in Figure 3 Compared with the traditional circular weight disc, a rectangular weight disc is used in the embodiment, and positions 120, 121, 122 and 123 are positions for loading standard weights during four-corner adjustment, and the weights are placed in the above positions to amplify the four-corner error to some extent, and the four-corner error is more easily adjusted.

[0059] The application also provides a four-corner error adjustment method for the integrated flexible hinge:

[0060] The vertical movement of the four screws is used to realize the horizontal displacement of the parallel four-bar flexible hinge force arm, so as to achieve the purpose of adjusting the hinge cutting edge position and reducing the four-corner error, wherein the through-hole screw is used to adjust the parallel four-bar flexible hinge to produce horizontal displacement towards the load end, and the inner hexagonal flat head adjusting screw is used to adjust the parallel four-bar flexible hinge to produce horizontal displacement towards the opposite direction of the load end.

[0061] As shown in Figure 3 and Figure 4 The embodiment includes the following steps when adjusting the four-corner error:

[0062] Step one, place the weight in any right-angle position of the rectangular weight disc at the load end of the integrated multi-hole flexible hinge, and wait for the controller to complete the balance reading and record the mass indication;

[0063] Step two, with the first placed right angle position as the starting point, in the reverse direction of rotation, the weight is moved to the second right angle, the third right angle and the fourth right angle position, that is, the position 120, the position 121, the position 122 and the position 123 in the figure, respectively record each mass indication, for the convenience of explanation, here the rectangular weight disc installation position is: the edge composed of the 120 and 121 positions of the rectangular weight disc is on the same side with the inner hexagonal screw 8.

[0064] Step three, also in the reverse direction of rotation, the indications of the two adjacent right angle positions on the short side are added and recorded as M1 and M3 respectively, the M1 value in the figure is the sum of the indications of the position 120 and the position 121, and the M3 value is the sum of the indications of the position 122 and the position 123, the indications of the two adjacent positions on the long side are added and recorded as M2 and M4 respectively, the M2 value is the sum of the indications of the position 121 and the position 122, and the M4 value is the sum of the indications of the position 120 and the position 123, the difference between M1 and M3 is recorded as Δm 13 , and the difference between M2 and M4 is recorded as Δm 24 .

[0065] The calculated difference Δm 13 and Δm 24 is the error amount that needs to be adjusted, the long side away from the adjusting mechanism is defined as front, and the opposite long side is defined as back, the following is described with Δm 24 as the front-back difference in step three, when Δm 24 > 0, rotate the inner hexagonal screw 5 in the U-shaped groove in the tightening direction by an appropriate angle, and vice versa; when Δm 13 > 0, that is, the left-right position difference is less than zero, rotate the inner hexagonal screw 7 in the U-shaped groove in the reverse direction by an appropriate angle, and vice versa; after each adjustment, recalculate the difference to observe whether it converges, if it has a convergence trend, continue to repeat the above steps until the four corner errors converge to the allowable range;

[0066] Step five, if the four corner errors do not have a convergence trend after repeating the above step four, at this time, rotate the two inner hexagonal screws in the adjusting mechanism in the reverse direction so that the screw nuts are completely separated from the through hole screw nuts, and rotate the through hole screw in the tightening direction so that the spring is completely compressed, at this time, repeat steps one to three, when Δm 24 > 0, rotate the through hole screw in the U-shaped groove on the side of the M3 short side position in the reverse direction by an appropriate angle, and vice versa; when Δm 13 > 0, rotate the through hole screw in the U-shaped groove on the side of the M1 short side position in the tightening direction by an appropriate angle, and vice versa; after each adjustment, recalculate the difference until it converges to the allowable four corner error range;

[0067] Step 5: If the difference between steps 1 to 5 does not converge or fails to converge to the allowable four-corner error range, it indicates that the hinge processing is abnormal.

[0068] This application also provides the application of the above-described four-corner error adjustment mechanism and method in a mass comparator.

[0069] The above description is merely a preferred embodiment of this application and does not constitute any limitation on this application. Any simple modifications and equivalent changes made to the above embodiments based on the technical essence of this application shall fall within the protection scope of this application.

Claims

1. A four-corner error adjustment mechanism for an integrated multi-hole flexible hinge, characterized in that, include: The base provides a lever fulcrum for connection with the hinge being adjusted; A first adjustment component is mounted on the base along a first direction and is used to apply a first elastic force to the lever fulcrum to cause the adjusted hinge to produce a first horizontal displacement. The second adjustment component is mounted on the base in a second direction opposite to the first direction, and is used to apply a second elastic force to the lever fulcrum, so that the adjusted hinge produces a second horizontal displacement opposite to the first horizontal displacement direction. Specifically, by selectively adjusting the magnitude and direction of the elastic force of the first adjustment component and / or the second adjustment component, a slight horizontal adjustment of the position of the hinge blade being adjusted is achieved, thereby reducing the four-corner error.

2. The mechanism according to claim 1, characterized in that, The base is a U-shaped groove, and the upper and lower crossbeams of the U-shaped groove are respectively provided with threaded holes. The lever fulcrum is formed by connecting the open end of the U-shaped groove to the hinge to be adjusted.

3. The mechanism according to claim 2, characterized in that, The first adjustment component includes: Through-hole screws are screwed onto the upper crossbeam; An elastic element is compressed and abutted between the through-hole screw and the lower crossbeam; wherein, rotating the through-hole screw can change the compression amount of the elastic element, thereby adjusting the first elastic force.

4. The mechanism according to claim 3, characterized in that, The second adjustment component includes: An internal hex screw passes through the through hole of the through-hole screw and is screwed to the lower crossbeam; wherein, rotating the internal hex screw allows its end to directly or indirectly press against the upper crossbeam to adjust the second elastic force.

5. The mechanism according to claim 3 or 4, characterized in that, The elastic element is a rigid spring, which is sleeved on the outer periphery of the internal hexagon screw and located between the through-hole screw and the lower crossbeam.

6. A method for adjusting the four-corner error of an integrated multi-hole flexible hinge, employing the mechanism described in any one of claims 1 to 5, characterized in that, Includes the following steps: a) Place weights of known mass at the four corners of the hinge load end in sequence, and obtain and record the corresponding mass readings; b) Calculate the front-to-back difference and the left-to-right difference based on the mass readings at the four corners to obtain the current error at the four corners; c) Based on the front-to-back difference and the left-to-right difference, selectively adjust the first adjustment component and / or the second adjustment component to apply a slight horizontal displacement to the hinge blade position; d) Repeat steps a)–c) until the before-after difference and the left-right difference converge to the allowable error range.

7. The method according to claim 6, characterized in that, In step b): The mass readings at two adjacent corners on the short side of the hinge load end are added together to obtain the first sum and the third sum, and the difference between them is used as the left and right difference. The mass readings at two adjacent corners on the long side of the hinge load end are added together to obtain the second and fourth sums, and the difference between them is used as the difference between the two values.

8. The method according to claim 7, characterized in that, In step c) above: When the difference between the preceding and following values ​​is greater than zero, the internal hex screw in the second adjustment assembly is rotated in the tightening direction; otherwise, it is rotated in the untightening direction; and / or When the difference between the left and right sides is greater than zero, rotate the internal hex screw in the second adjustment assembly in the unscrewing direction; otherwise, rotate in the tightening direction.

9. The method according to claim 8, characterized in that, If the differences between the preceding and following steps and / or the differences between the left and right steps do not converge after repeating steps a)–c), then: First, unscrew the internal hex screw of the second adjustment component until it is completely separated from the through-hole screw of the first adjustment component; Then tighten the through-hole screw in the tightening direction until the elastic element is fully compressed; The adjustment is then performed by rotating the through-hole screw until the difference converges.

10. The method according to claim 9, characterized in that, When adjusting using the through-hole screw: If the difference between the previous and subsequent rotations is greater than zero, rotate the corresponding through-hole screw in the unscrewing direction; otherwise, rotate in the tightening direction; and / or If the difference between the left and right sides is greater than zero, rotate the corresponding through-hole screw in the tightening direction; otherwise, rotate it in the untightening direction.

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