CN117073941A - Paper disc rigidity testing tool, testing device and testing method - Google Patents
Paper disc rigidity testing tool, testing device and testing method Download PDFInfo
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- CN117073941A CN117073941A CN202311069302.XA CN202311069302A CN117073941A CN 117073941 A CN117073941 A CN 117073941A CN 202311069302 A CN202311069302 A CN 202311069302A CN 117073941 A CN117073941 A CN 117073941A
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- 238000012360 testing method Methods 0.000 title claims abstract description 220
- 230000000670 limiting effect Effects 0.000 claims abstract description 106
- 239000000725 suspension Substances 0.000 claims description 20
- 238000006073 displacement reaction Methods 0.000 claims description 12
- 230000005484 gravity Effects 0.000 claims description 12
- 230000002093 peripheral effect Effects 0.000 claims description 12
- 238000009434 installation Methods 0.000 claims description 11
- 230000003287 optical effect Effects 0.000 claims description 10
- 238000010998 test method Methods 0.000 claims description 6
- 238000013508 migration Methods 0.000 abstract 1
- 230000005012 migration Effects 0.000 abstract 1
- 238000001125 extrusion Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 11
- 235000013305 food Nutrition 0.000 description 7
- 238000005452 bending Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 210000003811 finger Anatomy 0.000 description 6
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 4
- 230000003068 static effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 235000021167 banquet Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 210000003813 thumb Anatomy 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
- G01M5/005—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The application discloses a paper disc rigidity testing tool, a testing device and a testing method, comprising a seat rail; the support seat is connected to the seat rail in a sliding manner and comprises a support piece positioned at the end part and used for bearing the test paper disc; the middle assembly is connected to the seat rail in a sliding way and comprises limiting seats distributed on two sides of the supporting seat and a plurality of limiting rods connected with the limiting seats; the pressing assembly is connected to the seat rail in a sliding manner and comprises a pressing plate which can move towards or away from one side of the supporting seat; wherein, a plurality of gag levers symmetrical distribution are used for enclosing in the both sides of supporting seat and close the spacing region that forms spacing test paper dish horizontal migration, and when the test paper dish is spacing, the gag lever levers tangent conflict in the outer edge department of test paper dish, realize the preliminary centre gripping to test paper dish through the combination of supporting seat and clamp plate, combine the setting of centering subassembly to realize spacing to the level of test paper dish, and then improve the holistic centre gripping precision to test paper dish, be convenient for more accurate obtain test data.
Description
Technical Field
The application relates to the technical field of stiffness testing devices, in particular to a paper disc stiffness testing tool, a testing device and a testing method.
Background
The paper disc is used as a disposable paper holding part and is commonly used for holding cakes, fruits and other foods in some banquet. The paper tray containing food is bent by the gravity of the food during the carrying process, and when the food containing amount exceeds the bending rigidity of the paper tray, the bending deformation of the paper tray causes the food to drop.
At present, the execution standard of the bending rigidity of paper discs is temporarily absent in China, and the bending rigidity of paper discs circulated in the market is different according to materials and structures. However, in some special occasions or in some countries abroad, the bending rigidity of the paper disc is required to be within the specified execution standard range, so that the paper disc needs to be subjected to rigidity test before delivery to meet delivery requirements. Because the material of paper disc has certain compliance, there is certain degree of difficulty in the centre gripping location, the device equipment that can test to paper disc rigidity is temporarily unavailable in the market.
Disclosure of Invention
In order to achieve clamping and positioning of the paper disc, the first object of the application is to provide a paper disc rigidity testing tool.
The application provides a paper disc rigidity testing tool which adopts the following technical scheme:
a paper tray stiffness test fixture, comprising:
a seat rail;
the support seat is connected to the seat rail in a sliding manner and comprises a support piece positioned at the end part and used for bearing the test paper disc;
the centering assembly is connected to the seat rail in a sliding way and comprises limiting seats distributed on two sides of the supporting seat and a plurality of limiting rods connected with the limiting seats; and
the pressing assembly is connected to the seat rail in a sliding manner and comprises a pressing plate which can move close to or away from one side of the supporting seat;
the limiting rods are symmetrically distributed on two sides of the supporting seat and are used for enclosing to form a limiting area for limiting the horizontal movement of the test paper disc, and when the test paper disc is limited, the limiting rods are tangent and abutted to the outer edge of the test paper disc.
By adopting the technical scheme, when the test paper disc is clamped, the test paper disc is placed on the supporting piece, the supporting piece is used for simulating the supporting state of the bottom of the hand-held paper disc, the pressing plate is used for pressing the upper end of the test paper disc to simulate the state that the thumb presses the paper disc, and the test paper disc is initially clamped under the action of the supporting piece and the pressing plate; meanwhile, the centering component utilizes a plurality of limiting rods to be in conflict with the test paper disc to limit the movement of the test paper disc in the horizontal direction, so that the accuracy of the test process is improved.
Preferably, the highest point of the support seat is higher than the highest point of the centering assembly to carry all the gravity of the test tray.
Through adopting above-mentioned technical scheme, the supporting seat bears the total gravity of test paper dish and is used for simulating the supporting state of holding the test paper dish with the hand, and the test paper dish can be more concentrated at the rigidity test in-process action point that carries out simultaneously, and the rigidity data of measuring is more accurate, can understand that the action point area of contact that bears when test paper dish bottom is less, and the test paper dish takes place bending deformation more easily, and the data of measuring is just more accurate.
Preferably, the support member includes a support surface abutting the bottom of the test tray, the support surface being configured as an arcuate surface in line contact with the test tray or as a planar surface in contact with the test tray forming surface.
By adopting the technical scheme, when the supporting surface of the supporting piece is an arc surface, the surface of the finger of a person is simulated, and is in line contact under the theoretical condition of contacting with the test paper disc, the contact surface can reach the state under the theoretical simulation scene, and the test accuracy is better improved; of course, in the actual process, the test paper tray has certain gravity after holding food and is in surface contact with the finger surface of the person, and then in the actual state, the supporting surface is set to be planar after bearing the test paper tray, and the obtained test data are more fit with reality.
Preferably, at least two limit rods are arranged on the same limit seat, and the limit rods are distributed on two sides of the seat rail; the limiting rod is detachably connected to the limiting seat to realize displacement close to or far away from one side of the seat rail, and the displacement is used for limiting or expanding a limiting area.
Through adopting above-mentioned technical scheme, the quantity and the dismantlement mode of gag lever post are applicable to the test of different size paper discs. Secondly, detachable construction is convenient for to not unidimensional paper tray test in-process, and two spacing seats can be adjusted near the preset position of seat rail in advance simultaneously, and the last gag lever post of reloading carries out the precision adjustment, shortens the clamping time to test paper tray.
Preferably, the limit seat comprises a base connected with the seat rail in a sliding manner and suspension seats connected to two sides of the base, a plurality of gear holes are distributed on the end faces of the suspension seats at equal intervals, and the limit rod is inserted into any one of the gear holes.
By adopting the technical scheme, the stop lever is connected with the gear hole in a plugging manner in a detachable manner, so that the connection is quick and convenient; meanwhile, the gear holes are distributed on the suspension seat at equal intervals, and the gear holes at corresponding positions can be quickly selected aiming at the test paper disc limiting rods with different sizes, so that the clamping time of the test paper disc is further shortened.
Preferably, the positioning assembly is further included, the positioning assembly includes:
the dial indicator comprises a meter body, a sleeve connected with the meter body and a measuring rod extending into the sleeve;
wherein, the mounting hole that communicates the gear hole has been seted up on the lateral wall to the suspension seat, the sleeve connects with the mounting hole, and the measuring stick extends to in the mounting hole and is inconsistent with the outer wall of gag lever post, there is the clearance in the outer peripheral face of gag lever post and the inner wall in gear hole.
By adopting the technical scheme, when the centering component carries out horizontal limit adjustment on the test paper disc, and when the limiting rod is in conflict with the test paper disc, the moving distance of the manual limiting seat on the seat rail cannot guarantee the precision, so that a certain extrusion force exists between the limiting rod and the test paper disc, the extrusion force can generate static friction force, the larger the extrusion force is, the larger the generated static friction force is, when the test paper disc carries out rigidity test, the determined test data comprise the static friction force for overcoming the limiting rod and the test paper disc, and the obtained data have certain errors; the dial indicator is arranged on the hanging seat, the measuring rod of the dial indicator is abutted against the limiting rod, when the limiting rod is extruded with the test paper disc, the extrusion force between the limiting rod and the test paper disc can be obtained relatively accurately through the degree display of the dial indicator, at the moment, the extrusion force between the limiting rod and the test paper disc is adjusted intuitively through moving the limiting seat, the extrusion force between the limiting rod and the test paper disc is at the minimum value when the degree on the dial indicator is reduced to zero, and the obtained data is more accurate when the rigidity test is carried out.
Preferably, the positioning assembly further comprises:
the shaft sleeve is clamped in the mounting hole and comprises a first positioning part extending outwards from one end;
the connecting nut is connected with the shaft sleeve and can rotate relative to the shaft sleeve;
the sleeve comprises an optical axis section and a thread section which are connected, wherein the thread section and the optical axis section are arranged at the joint in a stepped manner to form a second positioning part, the optical axis section is connected with an inner hole of the shaft sleeve, and the thread section is connected with the connecting nut; when the dial indicator and the cantilever are connected, the first positioning part is abutted against the second positioning part.
By adopting the technical scheme, the sleeve of the dial indicator is matched with the shaft sleeve to replace the direct connection with the suspension seat, and the connection precision of the dial indicator and the shaft sleeve is higher because the shaft sleeve is an independent workable part; in addition, the sleeve sets up to the step shaft type, and the optical axis section is used for leading to location, and the screw thread section is used for being connected with coupling nut, and the installation accuracy of percentage table is realized in the conflict of first location portion and second location portion, accomplishes the location after the percentage table, and the gag lever post obtains the location in the initial position in gear hole, no matter how the gag lever post is in radial on this moment, and the percentage table is owing to the position invariable homoenergetic can read out corresponding numerical value, advances the produced extrusion force when judging gag lever post and the conflict of test paper dish of more precision for test data is more accurate.
In order to improve the test accuracy of the test paper tray, a second object of the present application is to provide a test device.
The application provides a testing device which adopts the following technical scheme:
a test device comprises
A work table;
the paper disc rigidity testing tool is arranged on the workbench;
the driving piece is arranged on the workbench;
and the load unit is used for applying load force to the test paper disc and is driven by the driving piece to displace close to or far from one side of the paper disc rigidity test tool.
Through adopting above-mentioned technical scheme, after the preliminary centre gripping of test paper tray at supporting seat and clamp plate, centering assembly accomplishes the level spacing to the test paper tray, and load cell begins to carry out rigidity load to the test paper tray and exert pressure under the drive of driving piece after whole test paper tray accomplishes the centre gripping location, and because the test paper tray obtains better spacing in the whole test process, it has ensured that the test data that obtains has better precision.
In order to improve the test accuracy of the test paper tray, a third object of the present application is to provide a test method.
The application provides a testing method which adopts the following technical scheme:
a test method, which adopts the test device, the test method comprises the following steps:
s1, adjusting the positions of two limiting seats of the centering assembly on the seat rail so as to allow a large enough space to be reserved between the two limiting seats for accommodating and placing a test paper disc;
s2, placing the test paper disc on a supporting piece, and ensuring that the collision position of the test paper disc and the supporting piece is the central position range of the test paper disc;
s3, adjusting the position of the supporting seat on the seat rail to ensure that the load rod is positioned above one side of the test paper disc;
s4, adjusting and loosening the locking screw to enable the pressing plate to freely fall under the action of self gravity until the pressing plate is abutted against the upper part of the test paper disc;
s5, adjusting the positions of the two limiting seats on the seat rail until the outer edge of the test paper disc is abutted against the outer peripheral surface of the limiting rod;
s6, starting the driving piece to drive the load unit to gradually descend until the load rod is abutted against the upper end face of the test paper disc, and recording the position of the load unit as an initial position at the moment;
and S7, gradually increasing the vertical displacement of the load unit, continuously applying load force to the test paper tray, reading the value of the pressure sensor based on the preset vertical displacement of the load unit, and determining the rigidity of the test paper tray based on the average value of the values of the pressure sensor read by the load unit in the preset times of loading cycles.
Through adopting above-mentioned technical scheme, test paper tray holds on support piece, and the clamp plate compresses tightly the test paper tray, and the preliminary location of test paper tray has been realized to support piece and clamp plate to the clamp plate is free whereabouts under the effect that does not receive the external force to compress tightly the operation to the test paper tray, and more true simulation holds the operating mode of test paper tray with the end, and all gravity bearing of test paper tray are on the finger of support. After preliminary location is accomplished, adjust centering subassembly and the inconsistent with test paper dish in a plurality of gag levers and the position on the seat rail, realize the level spacing to test paper dish, reduce test paper dish and take place horizontal float in the testing process, and then obtain the higher and test data who accords with actual operating mode of accuracy.
Preferably, S2-1, installing dial indicators on two limit seats, arranging a plurality of installation holes communicated with gear holes on the side walls of the suspension seats of the limit seats, inserting a sleeve of the dial indicators and a measuring rod into a shaft sleeve of the installation holes, rotating a connecting nut connected with the shaft sleeve until a second positioning part formed on the sleeve contacts with a first positioning part formed on the shaft sleeve, abutting the end part of the measuring rod with the outer peripheral surface of the limiting rod at the moment and abutting the limiting rod on the inner wall, close to the supporting seat, of the gear holes, returning to the reading of the dial indicators and recording as the initial position of the limiting rod in the gear holes;
s5, adjusting the positions of the two limiting seats on the seat rail until the outer edge of the test paper disc is abutted against the outer peripheral surface of the limiting rod, ensuring that the degree of the dial indicator is within a preset numerical range, and continuously adjusting the positions of the limiting seats until the degree is within the preset numerical range if the degree exceeds the preset numerical range of the dial indicator.
By adopting the technical scheme, when the centering assembly performs horizontal limiting operation between the tests, the radial stress of the limiting rod is detected by utilizing the dial indicator and the mounting on the suspension seat, and the extrusion force between the limiting rod and the test paper disc is reduced; simultaneously, the dial indicator is still through the structural setting of step shaft in installation location in-process, when being connected with coupling nut, the conflict of first location portion and second location portion realizes the installation accuracy and the stability after the installation of dial indicator. After the dial indicator is installed, the measuring rod is in contact with the limiting rod to return to zero, the radial movement of the limiting rod in the gear hole can intuitively reflect the extrusion force between the limiting rod and the test paper disc through the degree, the accuracy of position adjustment of the centering assembly is better realized, and the test accuracy is further improved.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the primary clamping of the test paper disc is realized through the combination of the supporting seat and the pressing plate, the horizontal limit of the test paper disc is realized through the combination of the setting of the centering component, the integral clamping precision of the test paper disc is further improved, and the test data can be obtained more accurately;
2. the dial indicator is connected with the limiting seat, so that the extrusion force between the limiting rod and the test paper disc can be better obtained through testing, the extrusion force is reduced through fine adjustment of the limiting seat, and further test data can be more accurately obtained;
3. through the telescopic ladder type setting of percentage table and with axle sleeve, coupling nut between the location be connected for the installation accuracy and the installation stability of percentage table obtain promoting, the percentage table after the location is at the reading return to zero after contradicting with the gag lever post simultaneously, and the radial of gag lever post is fleed and can be more accurate learn, better test data that obtains.
Drawings
Fig. 1 is a schematic structural diagram of a stiffness test fixture for a paper tray in the first embodiment;
FIG. 2 is a schematic structural view of a pressing assembly according to the first embodiment;
FIG. 3 is a front view of a stiffness test fixture for a paper tray in accordance with the first embodiment;
FIG. 4 is a schematic view showing a state after clamping the test tray in the first embodiment;
FIG. 5 is a schematic illustration of the connection of the test tray to the centering assembly in the first embodiment;
fig. 6 is a schematic structural diagram of a paper tray stiffness test fixture with another support structure according to the first embodiment;
FIG. 7 is a schematic illustration of the connection of a test tray to a centering assembly under an alternative support structure in accordance with the first embodiment;
fig. 8 is a schematic structural diagram of a stiffness test fixture for a paper tray in the second embodiment;
FIG. 9 is a schematic diagram illustrating the connection between the positioning assembly and the stop lever in the second embodiment;
FIG. 10 is a schematic diagram of a test apparatus according to a third embodiment;
fig. 11 is a force-receiving schematic diagram of a test tray in the third embodiment.
Reference numerals illustrate: 1. a seat rail; 2. a support base; 21. a support; 3. a limit seat; 31. a base; 32. a suspension seat; 321. a gear hole; 322. a mounting hole; 33. a limit rod; 4. a pressing assembly; 41. a pressing plate; 42. a pressing seat; 421. a stop block; 422. a stress port; 43. a guide groove; 44. a guide post; 45. a locking screw; 5. an adjusting screw; 6. a dial indicator; 61. a watch body; 62. a measuring rod; 63. an optical axis section; 64. a threaded section; 65. a second positioning portion; 7. a shaft sleeve; 71. a first positioning portion; 8. a coupling nut; 9. a work table; 10. testing the paper disc; 20. a driving member; 30. a load unit; 40. a pressure sensor; 50. and a load bar.
Description of the embodiments
The present application will be described in further detail with reference to the accompanying drawings.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Example 1
Referring to fig. 1, an embodiment of the application discloses a tool for testing rigidity of paper discs, which is suitable for clamping and positioning paper discs with different external dimensions such as round, oval and polygonal shapes. The paper disc rigidity testing tool comprises a seat rail 1, a supporting seat 2, a centering component and a pressing component 4, wherein the supporting seat 2, the centering component and the pressing component 4 are connected to the seat rail 1 in a sliding mode, and the position locking of the supporting seat 2, the centering component and the pressing component 4 on the seat rail 1 is achieved through the interference between an adjusting screw 5 and the seat rail 1.
The seat rail 1 is long and has a certain length, and scales are arranged on the side wall of the seat rail 1, so that the parts can be rapidly positioned when sliding on the seat rail 1. The centering assembly comprises two limiting seats 3, the two limiting seats 3 are distributed on two sides of the supporting seat 2 and comprise a base 31 matched with the seat rail 1 and suspension seats 32 connected to two sides of the base 31, the limiting seats 3 are integrally concave, and concave parts are used as yielding areas in the subsequent rigidity testing process.
Each suspension seat 32 is provided with a plurality of gear holes 321 on the upper end surface thereof, and the gear holes 321 are equidistantly distributed. The suspension seats 32 are further provided with limiting rods 33, one ends of the limiting rods 33 are inserted into any gear holes 321, in the embodiment, the limiting rods 33 are four and correspond to each suspension seat 32, the four limiting rods 33 enclose to form a limiting area, and along with the sliding of the two limiting seats 3 on the seat rail 1, the limiting area is enlarged or reduced accordingly.
Referring to fig. 2, the pressing assembly 4 is located at one side of one of the limiting seats 3, and includes a pressing seat 42 and a pressing plate 41, and one end of the pressing plate 41 extends toward one side of the limiting seat 3. The pressing seat 42 includes two stoppers 421, a guide slot 43 is formed between the two stoppers 421, and the pressing plate 41 is disposed in the guide slot 43 and can slide vertically along the guide slot 43.
In order to improve the guiding performance of the pressing plate 41 during vertical sliding, a guiding column 44 is further disposed at the lower end of the pressing plate 41, and the guiding column 44 is slidably connected to the pressing seat 42. A locking screw 45 is also rotatably connected between the two stoppers 421, one end of the locking screw 45 extends through one of the stoppers 421 and is in threaded connection with the other stopper 421, and displacement locking of the pressing plate 41 in the vertical direction is achieved by rotating the locking screw 45 to realize opposite movement of the two stoppers 421 and thus changing the width of the guide groove 43.
Referring to fig. 1 and 3 together, the support base 2 includes a support member 21 at an end, and the support member 21 is connected by a pin to realize a detachable structure. The plane P of the highest point of the supporting seat 2 (i.e. the highest point of the supporting piece 21) and the plane H of the highest point of the limiting seat 3 are defined, and the plane P is higher than the plane H in the vertical direction.
Referring to fig. 4, the supporting member 21 has a supporting surface which abuts against the test tray 10, and the supporting surface is provided in an arc-shaped surface for simulating the surface shape of a finger in one of the structures. When the test paper tray 10 is clamped and positioned, the supporting seat 2 is used for bearing and supporting all the gravity of the test paper tray 10, the supporting surface is in contact with the bottom surface of the test paper tray 10, and the contact between the supporting surface and the bottom surface is line contact; the pressing plate 41 freely falls to the upper end face of the test tray 10 in the guide groove 43 after the locking screw 45 is released.
Referring to fig. 5, after the pressing plate 41 falls onto the upper end surface of the test tray 10, the size of the limiting area is gradually changed along with the sliding of the limiting seat 3 on the seat rail 1 until the four limiting rods 33 are abutted against the outer edge of the test tray 10. Specifically, after the pressing plate 41 freely falls under the action of self gravity to press the upper end face of the test paper tray 10, no locking structure locks the pressing plate 41, and the pressing plate 41 is used for limiting one side of the test paper tray 10 to be tilted up instead of applying a clamping force to the test paper tray 10 by using a clamp-like principle through cooperation with the supporting seat 2. The clamping is realized without applying a clamping force to the paper tray in this embodiment, wherein one factor is that four limit rods 33 are used for inhibiting the horizontal movement of the test paper tray 10, so that the degree of freedom of movement of the test paper tray 10 is limited, the state under the hand-held paper tray is simulated more truly, and the damage to the test paper tray 10 after clamping is minimized.
Referring collectively to fig. 6 and 7, a schematic of the connection of the support member 21 to the test tray 10 in another configuration is shown. In this configuration, the supporting surface of the supporting member 21 is configured as a plane, and the action points are more concentrated with respect to the arc-shaped surface. In the actual state, during the process of holding the paper tray by hand, the surface of the finger is in surface contact with the paper tray when the weight of the food on the paper tray acts on the finger, so that the test data can be obtained more realistically under the structure of the supporting member 21.
Example two
Referring to fig. 8 and fig. 9 together, the embodiment of the application discloses a tool for testing rigidity of a paper disc, which is different from the first embodiment in that a positioning assembly connected with a limiting seat 3 is added. The positioning assembly comprises a dial indicator 6, a shaft sleeve 7 and a connecting nut 8, wherein the dial indicator 6 is connected with a suspension seat 32 through the shaft sleeve 7 and the connecting nut 8.
In this embodiment, the dial indicator 6 is a digital display dial indicator 6 with better measurement accuracy, and the structure of the dial indicator 6 includes a meter body 61, a sleeve connected with the meter body 61, and a measuring rod 62 extending into the sleeve.
The shaft sleeve 7 is connected with the suspension seat 32, the suspension seat 32 is provided with mounting holes 322 with the same number of gear holes 321 on the side surface, the mounting holes 322 are communicated with the gear holes 321, and the shaft sleeve 7 is clamped in the mounting holes 322.
The connecting nut 8 is sleeved on the shaft sleeve 7 and can rotate relatively. The sleeve 7 has a first positioning portion 71 at an end portion, the first positioning portion 71 is provided such that the sleeve 7 is in a ladder shape, and the coupling nut 8 is restrained from moving in one axial direction of the sleeve 7 by the restriction of the first positioning portion 71.
The sleeve includes an integral optical axis section 63 and a threaded section 64, which are stepped to form a second positioning portion 65 at the shoulder. When the dial indicator 6 is connected with the suspension 32, the optical axis section 63 is engaged with the shaft sleeve 7, the threaded section 64 is in threaded connection with the connecting nut 8, the dial indicator 6 can be displaced along the axial direction of the mounting hole 322 towards the gear hole 321 side in the process of rotating the connecting nut 8, and when the dial indicator 6 is connected with the suspension 32, the first positioning portion 71 is abutted against the second positioning portion 65, and meanwhile, the end portion of the measuring rod 62 is abutted against the outer peripheral surface of the limiting rod 33.
Specifically, in this embodiment, the stop lever 33 is in clearance fit with the gear hole 321, that is, a clearance B exists between the outer peripheral surface of the stop lever 33 and the inner wall of the gear hole 321, after the dial indicator 6 completes positioning and mounting and the degree returns to zero, the elastic force of the measuring rod 62 is utilized to act on the stop lever 33 to make the stop lever 33 always have a movement trend towards the support seat 2 side, when the test paper tray 10 is in contact with the stop lever 33, the test dial indicator 6 can measure the extrusion force between the stop lever 33 and the test paper tray 10 due to the existence of the clearance B, and then continuously adjust the position of the stop seat 3 on the seat rail 1 to reduce the extrusion force.
Example III
Referring to fig. 10, an embodiment of the present application discloses a testing device, which includes a workbench 9, a testing tool for stiffness of a paper tray installed on the workbench 9 as in embodiment one, a driving member 20, and a load unit 30 connected to the driving member 20. The load unit 30 is driven by the driving member 20 to move near to or far from one side of the paper disc rigidity testing tool, and specifically comprises a pressure sensor 40 and a load rod 50 connected with the pressure sensor. In this embodiment, the driving member 20 is in the form of a hydraulic driving member 20, an electric driving member 20 or other driving device, such as a hydraulic cylinder, an electric cylinder, a linear module, etc.
Referring to fig. 11, after the test tray 10 is clamped and positioned by the tray stiffness test fixture, a load force F is applied to the test tray 10 by the load lever 50, and then the stiffness data of the test tray 10 is determined by the pressure sensor 40.
Specifically, the testing method of the testing device comprises the following steps:
s1, adjusting the positions of the two limiting seats 3 of the centering assembly on the seat rail 1 to allow a large enough space to be reserved between the two limiting seats 3 for accommodating the test paper tray 10;
s2, placing the test paper tray 10 on the supporting piece 21, and ensuring that the collision position of the test paper tray 10 and the supporting piece 21 is the central position range of the test paper tray 10;
s3, adjusting the position of the supporting seat 2 on the seat rail 1 to ensure that the load rod 50 is positioned above one side of the test paper tray 10;
s4, adjusting and loosening the locking nut, so that the pressing plate 41 can freely fall under the action of self gravity until the pressing plate is abutted against the upper part of the test paper tray 10;
s5, adjusting the positions of the two limiting seats 3 on the seat rail 1 until the outer edge of the test paper tray 10 is abutted against the outer peripheral surface of the limiting rod 33;
s6, starting the driving piece 20 to drive the load unit 30 to gradually descend until the load rod 50 is abutted against the upper end face of the test paper tray 10, and recording that the position of the load unit 30 is the initial position at the moment;
s7, gradually increasing the vertical displacement amount of the load unit 30, continuously applying a load force to the test tray 10, reading the value of the pressure sensor 40 based on the predetermined vertical displacement amount of the load unit 30, and determining the rigidity of the test tray 10 based on the average value of the values of the pressure sensor 40 read by the load unit 30 in a predetermined number of loading cycles.
Example IV
The embodiment of the application discloses a testing device, which is different from the third embodiment in that a paper disc rigidity testing tool as in the second embodiment is adopted. The testing method of the testing device of the embodiment comprises the following steps:
s1, adjusting the positions of the two limiting seats 3 of the centering assembly on the seat rail 1 to allow a large enough space to be reserved between the two limiting seats 3 for accommodating the test paper tray 10;
s2, placing the test paper tray 10 on the supporting piece 21, and ensuring that the collision position of the test paper tray 10 and the supporting piece 21 is the central position range of the test paper tray 10;
s2-1, installing dial indicators 6 on the two limiting seats 3, inserting a sleeve of the dial indicators 6 and a measuring rod 62 into a shaft sleeve 7 of an installation hole 322, rotating a connecting nut 8 connected with the shaft sleeve 7 until a second positioning part 65 is abutted against a first positioning part 71, abutting the end part of the measuring rod 62 against the outer peripheral surface of a limiting rod 33 at the moment, abutting the limiting rod 33 against the inner wall of a gear hole 321, which is close to the supporting seat 2, returning to the reading of the dial indicators 6 and recording the initial position of the limiting rod 33 in the gear hole 321;
and S3, adjusting the position of the supporting seat 2 on the seat rail 1 to ensure a load rod. 50 is above one side of the test tray 10;
s4, adjusting and loosening the locking nut, so that the pressing plate 41 can freely fall under the action of self gravity until the pressing plate is abutted against the upper part of the test paper tray 10;
s5, adjusting the positions of the two limiting seats 3 on the seat rail 1 until the outer edges of the test paper discs 10 are abutted against the outer peripheral surfaces of the limiting rods 33, ensuring that the degrees of the dial indicators 6 at the moment are within a preset numerical range, and continuously adjusting the positions of the limiting seats 3 until the degrees are within the preset numerical range if the degrees exceed the preset numerical range of the dial indicators 6.
S6, starting the driving piece 20 to drive the load unit 30 to gradually descend until the load rod 50 is abutted against the upper end face of the test paper tray 10, and recording that the position of the load unit 30 is the initial position at the moment;
s7, gradually increasing the vertical displacement amount of the load unit 30, continuously applying a load force to the test tray 10, reading the value of the pressure sensor 40 based on the predetermined vertical displacement amount of the load unit 30, and determining the rigidity of the test tray 10 based on the average value of the values of the pressure sensor 40 read by the load unit 30 in a predetermined number of loading cycles.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (10)
1. A paper disc rigidity test fixture which is characterized by comprising:
a seat rail (1);
the support seat (2) is connected to the seat rail (1) in a sliding manner, and the support seat (2) comprises a support piece (21) positioned at the end part and used for bearing the test paper disc (10);
the centering assembly is connected to the seat rail (1) in a sliding manner and comprises limiting seats (3) distributed on two sides of the supporting seat (2) and a plurality of limiting rods (33) connected with the limiting seats (3); and
the pressing assembly (4) is connected to the seat rail (1) in a sliding manner and comprises a pressing plate (41) which can move close to or away from one side of the supporting seat (2);
the limiting rods (33) are symmetrically distributed on two sides of the supporting seat (2) and are used for enclosing to form a limiting area for limiting the horizontal movement of the test paper tray (10), and when the test paper tray (10) is limited, the limiting rods (33) are tangent and abutted to the outer edge of the test paper tray (10).
2. A tray stiffness testing tool according to claim 1, characterized in that the highest point of the support base (2) is higher than the highest point of the centering assembly to carry all the gravity of the test tray (10).
3. A tray stiffness testing tool according to claim 1, wherein the support member (21) comprises a support surface abutting against the bottom of the test tray (10), the support surface being configured as an arcuate surface in line contact with the test tray (10) or as a planar surface in surface contact with the test tray (10).
4. The tool for testing the rigidity of the paper disc according to claim 1, wherein at least two limiting rods (33) are arranged on the same limiting seat (3), and the limiting rods (33) are distributed on two sides of the seat rail (1); the limiting rod (33) is detachably connected to the limiting seat (3) to achieve displacement close to or far away from one side of the seat rail (1) and used for limiting or expanding a limiting area.
5. The tool for testing the rigidity of the paper disc according to claim 4, wherein the limiting seat (3) comprises a base (31) which is slidably connected with the seat rail (1) and suspension seats (32) which are connected to two sides of the base (31), a plurality of gear holes (321) are equidistantly arranged on the end face of the suspension seats (32), and the limiting rod (33) is inserted into any one of the gear holes (321).
6. The tray stiffness test fixture of claim 5, further comprising a positioning assembly, the positioning assembly comprising:
the dial indicator (6), the dial indicator (6) comprises a meter body (61), a sleeve connected with the meter body (61) and a measuring rod (62) stretching in the sleeve;
the device comprises a hanging seat (32), a sleeve and a measuring rod, wherein the hanging seat is characterized in that a mounting hole (322) communicated with a gear hole (321) is formed in the side wall of the hanging seat, the sleeve is connected with the mounting hole (322), the measuring rod (62) extends into the mounting hole (322) and is in contact with the outer wall of a limiting rod (33), and a gap exists between the outer peripheral surface of the limiting rod (33) and the inner wall of the gear hole (321).
7. The tray stiffness test fixture of claim 6, wherein the positioning assembly further comprises:
the shaft sleeve (7) is clamped in the mounting hole (322), and the shaft sleeve (7) comprises a first positioning part (71) extending outwards from one end;
the connecting nut (8) is connected with the shaft sleeve (7) and can rotate relative to the shaft sleeve (7);
the sleeve comprises an optical axis section (63) and a thread section (64) which are connected, wherein the thread section (64) and the optical axis section (63) are arranged at the joint in a stepped manner to form a second positioning part (65), the optical axis section (63) is connected with an inner hole of the shaft sleeve (7), and the thread section (64) is connected with the connecting nut (8); when the dial indicator (6) and the cantilever are connected, the first positioning part (71) is abutted against the second positioning part (65).
8. A test apparatus, comprising
A work table (9);
a tray stiffness test fixture according to any one of claims 1-7, mounted on a table (9);
a driving member (20) provided on the table (9);
and the load unit (30) is used for applying load force to the test paper disc (10) and is driven by the driving piece (20) to move towards or away from one side of the paper disc rigidity test tool.
9. A test method employing the test device of claim 8, wherein the test method comprises the steps of:
s1, adjusting the positions of two limiting seats (3) of a centering assembly on a seat rail (1) to allow a large enough space to be reserved between the two limiting seats (3) for accommodating a test paper disc (10);
s2, placing the test paper tray (10) on the supporting piece (21), and ensuring that the abutting position of the test paper tray (10) and the supporting piece (21) is the central position range of the test paper tray (10);
s3, adjusting the position of the supporting seat (2) on the seat rail (1) to ensure that the load rod (50) is positioned above one side of the test paper disc (10);
s4, adjusting and loosening the locking screw (45) to enable the pressing plate (41) to freely fall under the action of self gravity until the pressing plate is abutted against the upper part of the test paper disc (10);
s5, adjusting the positions of the two limiting seats (3) on the seat rail (1) until the outer edge of the test paper disc (10) is abutted against the outer peripheral surface of the limiting rod (33);
s6, starting the driving piece (20) to drive the load unit (30) to gradually descend until the load rod (50) is abutted against the upper end face of the test paper disc (10), and recording the position of the load unit (30) as an initial position at the moment;
s7, gradually increasing the vertical displacement of the load unit (30), continuously applying a load force to the test paper tray (10), reading the numerical value of the pressure sensor (40) based on the preset vertical displacement of the load unit (30), and determining the rigidity of the test paper tray (10) based on the average value of the numerical values of the pressure sensor (40) read by the load unit (30) in a preset number of loading cycles.
10. The test method according to claim 9, wherein,
s2-1, installing a dial indicator (6) on two limit seats (3), arranging a plurality of installation holes (322) communicated with a gear hole (321) on the side wall of a suspension seat (32) of the limit seat (3), inserting a sleeve of the dial indicator (6) and a measuring rod (62) into a shaft sleeve (7) of the installation holes (322), rotating a connecting nut (8) connected with the shaft sleeve (7) until a second positioning part (65) formed on the sleeve is in contact with a first positioning part (71) formed on the shaft sleeve (7), at the moment, the end part of the measuring rod (62) is in contact with the outer circumferential surface of the limiting rod (33) and the limiting rod (33) is in contact with the inner wall of the gear hole (321) close to the support seat (2), and marking the reading of the dial indicator (6) as the initial position of the limiting rod (33) in the gear hole (321);
s5, adjusting the positions of the two limiting seats (3) on the seat rail (1) until the outer edge of the test paper disc (10) is abutted against the outer peripheral surface of the limiting rod (33), ensuring that the degree of the dial indicator (6) is within a preset numerical range, and continuously adjusting the positions of the limiting seats (3) until the degree is within the preset numerical range if the degree exceeds the preset numerical range of the dial indicator (6).
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| CN202311069302.XA CN117073941B (en) | 2023-08-23 | 2023-08-23 | Paper disc rigidity testing tool, testing device and testing method |
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| CN202311069302.XA CN117073941B (en) | 2023-08-23 | 2023-08-23 | Paper disc rigidity testing tool, testing device and testing method |
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| CN117073941B (en) | 2024-11-08 |
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