CN110196190B - Method for testing compressive strength of helical blade - Google Patents
Method for testing compressive strength of helical blade Download PDFInfo
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- CN110196190B CN110196190B CN201910418773.4A CN201910418773A CN110196190B CN 110196190 B CN110196190 B CN 110196190B CN 201910418773 A CN201910418773 A CN 201910418773A CN 110196190 B CN110196190 B CN 110196190B
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 25
- 230000007246 mechanism Effects 0.000 claims abstract description 20
- 238000010998 test method Methods 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
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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
- G01N3/04—Chucks
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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
- G01N3/06—Special adaptations of indicating or recording means
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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
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/062—Special adaptations of indicating or recording means with mechanical indicating or recording means
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0482—Chucks, fixtures, jaws, holders or anvils comprising sensing means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0605—Mechanical indicating, recording or sensing means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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Abstract
The invention discloses a method for testing the compressive strength of a helical blade, which comprises the following steps: 1) determining the positions of the helical blades, wherein the grooves on the two clamping blocks can be fittingly clamped on the two adjacent helical blades to be tested; 2) simultaneously starting the two pushing mechanisms, enabling the two clamping blocks to synchronously move towards the mutually approaching direction by the pushing of the pushing shaft, recording a displacement value a and respective stress values b and c of the two adjacent spiral blades, and then returning the two clamping blocks; 3) repeating step 2), and recording the values of b1, b2 … … bn and c1, c2 … … cn when the displacement values are a1, a2 … … an; 4) taking the displacement d of the single helical blade as a/2 and the stress e as (b1+ c1)/2, and drawing a relation curve of d and e through the data recorded in the step 3). The method for testing the compressive strength of the helical blade can be used for testing the compressive strength of the helical blade in the stress direction.
Description
Technical Field
The invention relates to a strength test, in particular to a method for testing the compressive strength of a helical blade.
Background
Helical blades are widely used in conveyor conveyors, and the direction of the force applied by the helical blade for conveying is the advancing direction of the helical blade, i.e. the direction parallel to the main axis of the helical blade. It is therefore necessary to test the compressive strength of the helical blade in the direction of the main force, especially when the helical blade has a certain degree of wear after a period of use, in order to determine whether it can be used again.
Disclosure of Invention
The invention aims to provide a method for testing the compressive strength of a helical blade, which can be used for testing the compressive strength of the helical blade in the stress direction.
In order to achieve the purpose, the invention provides a method for testing the compressive strength of a helical blade, which is carried out by using a compressive strength testing device, wherein the compressive strength testing device comprises a transverse plate, two fixed blocks are fixedly connected to two ends of the bottom of the transverse plate respectively, one sides of the two fixed blocks, which face away from each other, are fixedly connected with a pushing mechanism respectively, and a gap is formed between the two fixed blocks; one ends, facing each other, of the two pushing mechanisms are respectively provided with a pushing shaft, the two pushing shafts respectively penetrate through the fixing blocks adjacent to the two pushing shafts and extend into the gap, and one ends, facing each other, of the two pushing shafts are respectively and fixedly connected with a clamping block; grooves matched with the spiral blades are formed at the bottoms of the clamping blocks, pressure sensors are embedded in the side walls of the two grooves, which are opposite to each other, a scale rod is fixedly connected to one of the clamping blocks, and the end part of the scale rod slidably penetrates through the other clamping block and then slidably penetrates through one of the fixed blocks; the compression strength test method comprises the following steps: 1) determining the positions of the helical blades so that the grooves on the two clamping blocks can be clamped on the two adjacent helical blades to be tested in a fitting manner; 2) simultaneously starting the two pushing mechanisms, enabling the two clamping blocks to synchronously move towards the mutually approaching direction by the pushing of the pushing shaft, recording a displacement value a and respective stress values b and c of two adjacent spiral blades, and then returning the two clamping blocks; 3) repeating step 2), and recording the values of b1, b2 … … bn and c1, c2 … … cn when the displacement values are a1, a2 … … an; 4) taking the displacement d of the single helical blade as a/2 and the stress e as (b1+ c1)/2, and drawing a relation curve of d and e through the data recorded in the step 3).
Preferably, the steps 1) -4) are repeated to test all the two adjacent helical blades, and a relation curve is drawn for the repeatedly measured displacement amount and the force measuring average value of the helical blades.
Preferably, in the compressive strength testing method, the pushing mechanism used is an air cylinder or a hydraulic pump, and the pushing shaft is a shaft body on the air cylinder or the hydraulic pump.
Preferably, in the compressive strength test method, the axes of the two pushing shafts used are located on the same line.
Preferably, in the method for testing the compressive strength, a handle is further arranged above the transverse plate, and a handle sleeve is sleeved on the handle; in the step 1), a handle sleeve on the handle is held by hand to align and clamp the grooves in the two clamping blocks on the two adjacent helical blades to be tested.
Preferably, the outside of the scale rod is coated with a slip-resistant transparent coating.
Preferably, the scale bar is cylindrical.
Preferably, a pressure tester body is embedded in the upper surface of the transverse plate, and the pressure tester body is connected with the pressure sensor through a lead.
Preferably, one end of each wire extends into the two clamping blocks and is electrically connected to the corresponding pressure sensor, and the other end of each wire extends into the transverse plate and is electrically connected to the pressure tester body.
Preferably, the wire comprises a main wire and two branch wires, the two branch wires respectively penetrate into one of the clamping blocks, and the parts of the two branch wires outside the clamping blocks are all arranged in a spiral shape.
According to the technical scheme, two fixed blocks are fixedly connected to two ends of the bottom of the transverse plate respectively, one sides, back to each other, of the two fixed blocks are fixedly connected with a pushing mechanism respectively, and a gap is formed between the two fixed blocks; one ends, facing each other, of the two pushing mechanisms are respectively provided with a pushing shaft, the two pushing shafts respectively penetrate through the fixing blocks adjacent to the two pushing shafts and extend into the gap, and one ends, facing each other, of the two pushing shafts are respectively and fixedly connected with a clamping block; grooves matched with the spiral blades are formed at the bottoms of the clamping blocks, pressure sensors are embedded in the side walls of the two grooves, which are opposite to each other, a scale rod is fixedly connected to one of the clamping blocks, and the end part of the scale rod slidably penetrates through the other clamping block and then slidably penetrates through one of the fixed blocks; the compression strength test method comprises the following steps: 1) determining the positions of the helical blades so that the grooves on the two clamping blocks can be clamped on the two adjacent helical blades to be tested in a fitting manner; 2) simultaneously starting the two pushing mechanisms, enabling the two clamping blocks to synchronously move towards the mutually approaching direction by the pushing of the pushing shaft, recording a displacement value a and respective stress values b and c of two adjacent spiral blades, and then returning the two clamping blocks; 3) repeating step 2), and recording the values of b1, b2 … … bn and c1, c2 … … cn when the displacement values are a1, a2 … … an; 4) taking the displacement d of the single helical blade as a/2 and the stress e as (b1+ c1)/2, and drawing a relation curve of d and e through the data recorded in the step 3). During the use, with two slot block on two adjacent helical blade, start two pushing mechanism, thereby promote two axial to remove, and then promote two adjacent helical blade formation through two grip blocks and be close to the trend of removing, when the effort that produces on helical blade reaches certain limit, helical blade then can produce certain deformation, the deformation volume is located rather than the position of gliding grip block relatively through the scale pole and confirms, read out the scale before the deformation and the scale after the deformation respectively and acquire displacement value a. The pressure on the helical blades can be obtained by pressure sensors, wherein the displacement d of each helical blade is half of the total deformation, and the stress e on a single helical blade is the average value of the stress values b and c measured by the two pressure sensors. And finally, obtaining the compressive strength of the helical blade through the relation curve of d and e.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of a preferred embodiment of the compressive strength test method of the present invention;
fig. 2 is a schematic view of the structure of the bottom surface groove portion of the clamp block in the present invention.
Description of the reference numerals
1 horizontal plate 2 fixed block
3 pushing mechanism 4 clamping block
5 groove 6 pressure sensor
7 scale rod 8 handle
9 handle sleeve 10 pressure tester body
11 branch line
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, unless otherwise specified, directional words included in terms such as "upper, lower, left, right, front, rear, inner, and outer" and the like merely represent the directions of the terms in a normal use state or are colloquially known by those skilled in the art, and should not be construed as limiting the terms.
Referring to the compressive strength testing device shown in fig. 1-2, the compressive strength testing method is carried out by using the compressive strength testing device, the compressive strength testing device comprises a transverse plate 1, two fixed blocks 2 are fixedly connected to two ends of the bottom of the transverse plate 1 respectively, a pushing mechanism 3 is fixedly connected to one side of each of the two fixed blocks 2, which faces away from each other, respectively, and a gap is formed between the two fixed blocks 2; one ends, facing each other, of the two pushing mechanisms 3 are respectively provided with a pushing shaft, the two pushing shafts respectively penetrate through the fixing block 2 adjacent to the two pushing shafts and extend into the gap, and one ends, facing each other, of the two pushing shafts are respectively and fixedly connected with a clamping block 4; grooves 5 matched with the spiral blades are formed at the bottoms of the clamping blocks 4, pressure sensors 6 are embedded in the side walls of the two grooves 5, which are opposite to each other, a scale rod 7 is fixedly connected to one of the clamping blocks 4, and the end part of the scale rod 7 slidably penetrates through the other clamping block 4 and then slidably penetrates through one of the fixed blocks 2; the compression strength test method comprises the following steps: 1) determining the positions of the helical blades so that the grooves on the two clamping blocks 4 can be clamped on the two adjacent helical blades to be tested in a fitting manner; 2) simultaneously starting the two pushing mechanisms 3, synchronously moving the two clamping blocks 4 towards the mutually approaching direction by the pushing of the pushing shaft, recording a displacement value a and respective stress values b and c of two adjacent spiral blades after the two clamping blocks 4 move towards the mutually approaching direction by the same displacement, and then returning the two clamping blocks 4; 3) repeating step 2), and recording the values of b1, b2 … … bn and c1, c2 … … cn when the displacement values are a1, a2 … … an; 4) taking the displacement d of the single helical blade as a/2 and the stress e as (b1+ c1)/2, and drawing a relation curve of d and e through the data recorded in the step 3).
Through the implementation of above-mentioned technical scheme, during the use, with two 5 blocks of slot on two adjacent helical blade, start two pushing mechanism 3, thereby with two promotion axial displacement, and then promote two adjacent helical blade formation through two grip blocks 4 and be close to the trend of removal, when the effort that produces on helical blade reaches certain limit, helical blade then can produce certain deformation, the deformation volume is located rather than the position of relative slip grip block 4 through scale pole 7 and confirms, read out scale before the deformation and the scale after the deformation respectively and acquire displacement value a. The pressure applied to the helical blades can be obtained by the pressure sensors 6, wherein the displacement d of each helical blade is half of the total deformation, and the applied force e applied to a single helical blade is the average value of the applied force values b and c measured by the two pressure sensors 6. And finally, obtaining the compressive strength of the helical blade through the relation curve of d and e.
In this embodiment, in order to obtain the compressive strength of each helical blade more accurately, preferably, steps 1) -4) are repeated to test all adjacent two helical blades, and a relation curve is drawn on the average value of the displacement and the force of the helical blade which are repeatedly measured.
In this embodiment, the pushing mechanism 3 may be selected from a wide range in the field, and preferably, in the compressive strength testing method, the pushing mechanism 3 used is an air cylinder or a hydraulic pump, and the pushing shaft is a shaft body on the air cylinder or the hydraulic pump. Besides the air cylinder or the hydraulic pump, a linear stepping motor and the like can be selected.
In this embodiment, in order to make the stress between two adjacent helical blades more uniform and not to generate relative torsion to affect the test effect, it is preferable that in the compressive strength test method, the axes of two pushing shafts used are located on the same straight line.
In this embodiment, in order to facilitate offline testing and improve the convenience of testing, preferably, in the compressive strength testing method, a handle 8 is further disposed above the transverse plate 1, and a handle sleeve 9 is sleeved on the handle 8. In the step 1), the handle sleeve 9 on the handle 8 is held by hand to align and clamp the grooves in the two clamping blocks 4 on the two adjacent helical blades to be tested.
In this embodiment, in order to prevent the scale bar 7 from wearing the scale on the surface thereof when sliding in one of the clamping blocks 4 and the fixed block 2, it is preferable that the outside of the scale bar 7 is coated with a slip-resistant transparent coating.
In this embodiment, in order to improve the smoothness of the sliding of the scale bar 7, it is preferable that the scale bar 7 is cylindrical.
In this embodiment, in order to further facilitate reading of the pressure sensed by the pressure sensor 6, it is preferable that a pressure tester body 10 is embedded in the upper surface of the transverse plate 1, and the pressure tester body 10 is connected to the pressure sensor 6 through a wire.
In this embodiment, in order to facilitate the simultaneous measurement of the pressure values measured by the two pressure sensors 6 in the two clamping blocks 4, it is preferable that one end of the wire penetrates into the two clamping blocks 4 and is electrically connected to the corresponding pressure sensor 6, and the other end of the wire penetrates into the transverse plate 1 and is electrically connected to the pressure tester body 10. The two pressure sensors 6 are connected in parallel, and are used for respectively reading the pressures at different positions and respectively displaying the pressures in the pressure tester body 10.
In this embodiment, in order to prevent the wire from being damaged during the movement of the clamping block 4, it is preferable that the wire includes a main wire and two branch wires 11, the two branch wires 11 respectively penetrate into one of the clamping blocks 4, and portions of the two branch wires 11 located outside the clamping block 4 are each provided in a spiral shape. By providing the branch wire 11 in a spiral shape, similar to a spring-like shape, the tensile strength of the branch wire 11 can be increased. The main line differs from the branch line 11 in that: the two strands 11 are sheathed together by a sheath.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. The method for testing the compressive strength of the helical blade is characterized by being carried out by using a compressive strength testing device, wherein the compressive strength testing device comprises a transverse plate (1), two fixed blocks (2) are fixedly connected to two ends of the bottom of the transverse plate (1) respectively, one sides of the two fixed blocks (2) which are opposite to each other are fixedly connected with a pushing mechanism (3) respectively, and a gap is formed between the two fixed blocks (2);
one ends, facing each other, of the two pushing mechanisms (3) are respectively provided with a pushing shaft, the two pushing shafts respectively penetrate through the fixing block (2) adjacent to the two pushing shafts and extend into the gap, and one ends, facing each other, of the two pushing shafts are respectively and fixedly connected with a clamping block (4);
grooves (5) matched with the spiral blades are formed at the bottoms of the clamping blocks (4), pressure sensors (6) are embedded in the side walls of the two grooves (5) which are opposite to each other, a scale rod (7) is fixedly connected to one of the clamping blocks (4), and the end part of the scale rod (7) can slidably penetrate through the other clamping block (4) and then slidably penetrate through one of the fixing blocks (2);
the compression strength test method comprises the following steps:
1) determining the positions of the helical blades so that the grooves on the two clamping blocks (4) can be fittingly clamped on the two adjacent helical blades to be tested;
2) simultaneously starting the two pushing mechanisms (3), synchronously moving the two clamping blocks (4) towards the mutually approaching direction by the same displacement under the pushing of the pushing shaft, recording a displacement value a and respective stress values b and c of two adjacent spiral blades, and then returning the two clamping blocks (4);
3) repeating the step 2), and recording the displacement value as a1、a2……anWhen b is1、b2……bnAnd c1、c2……cnA value of (d);
4) taking the displacement d = a/2 and the force e = (b + c)/2 of the single helical blade, and plotting the relation between d and e through the data recorded in the step 3).
2. The method for testing the compressive strength of the helical blade as claimed in claim 1, wherein the steps 1) -4) are repeated to test all the adjacent two helical blades, and a relation curve is drawn by measuring the average value of the displacement and the stress of the helical blade which are repeatedly measured.
3. The helical blade compressive strength testing method as claimed in claim 1, wherein the pushing mechanism (3) used in the compressive strength testing method is a cylinder or a hydraulic pump, and the pushing shaft is a shaft body on the cylinder or the hydraulic pump.
4. The method for testing the compressive strength of a helical blade according to claim 1, wherein the axes of the two pushing shafts used in the method are located on the same line.
5. The method for testing the compressive strength of the helical blade is characterized in that a handle (8) is further arranged above the transverse plate (1) used in the method for testing the compressive strength, and a handle sleeve (9) is sleeved on the handle (8);
in the step 1), a handle sleeve (9) on a handle (8) is held by hand to align and clamp the grooves in the two clamping blocks (4) on the two adjacent helical blades to be tested.
6. The method for testing the compressive strength of a helical blade according to claim 1, wherein the outside of the scale bar (7) is coated with a slip-resistant transparent coating.
7. The method for testing the compressive strength of a helical blade according to claim 1 or 6, wherein the scale bar (7) is cylindrical.
8. The method for testing the compressive strength of the helical blade is characterized in that a pressure tester body (10) is embedded in the upper surface of the transverse plate (1), and the pressure tester body (10) is connected with the pressure sensor (6) through a lead.
9. The method for testing the compressive strength of a helical blade according to claim 8, wherein one end of the wire penetrates into the two clamping blocks (4) and is electrically connected to the corresponding pressure sensor (6), and the other end of the wire penetrates into the transverse plate (1) and is electrically connected to the pressure tester body (10).
10. The method for testing the compressive strength of a helical blade as claimed in claim 9, wherein the wire comprises a main wire and two branch wires (11), the two branch wires (11) respectively penetrate into one of the clamping blocks (4), and the parts of the two branch wires (11) outside the clamping blocks (4) are both arranged in a helical shape.
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Denomination of invention: Testing method for compressive strength of spiral blades Effective date of registration: 20230411 Granted publication date: 20220308 Pledgee: Wuhu Yangzi rural commercial bank Limited by Share Ltd. Pledgor: WUHU ADER CONVEYOR MACHINERY Co.,Ltd. Registration number: Y2023980037668 |
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