CN111649883B - Evaluation method of circular knife spring of splitting machine and circular knife spring elasticity testing device used in evaluation method - Google Patents
Evaluation method of circular knife spring of splitting machine and circular knife spring elasticity testing device used in evaluation method Download PDFInfo
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- CN111649883B CN111649883B CN202010451460.1A CN202010451460A CN111649883B CN 111649883 B CN111649883 B CN 111649883B CN 202010451460 A CN202010451460 A CN 202010451460A CN 111649883 B CN111649883 B CN 111649883B
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Abstract
The invention discloses an evaluation method of a circular knife spring of a splitting machine and a circular knife spring elasticity testing device used by the same. The evaluation method can accurately judge whether the circular knife spring meets the requirements or not so as to enable the circular knife to reach the optimal use state, prolong the service life of the circular knife and improve the cutting yield. The circular knife spring elasticity testing device is matched with the circular knife to test elasticity after being installed, and the using state of the circular knife spring is restored, so that the detection has more persuasion and confidence. The whole structure is simple, the installation is convenient, and the operation is simple.
Description
Technical Field
The invention relates to the technical field of diaphragm cutting, in particular to an evaluation method of a circular knife spring of a splitting machine and a circular knife spring elasticity testing device used in the evaluation method.
Background
The circular knife of the diaphragm dividing and cutting machine is one of the knives widely used at present, in order to enable the circular knife to have better dividing and cutting effects, a plurality of items need to be detected before the circular knife is used, for example, whether the cutting edge of the knife is worn or not, whether the knife support is fixed or not and the like. The elasticity of the spring of the circular knife on the knife holder has important influence on the service life of the circular knife and the cutting yield of the circular knife cutting the diaphragm. If the elasticity of the spring of the circular knife is too small, the circular knife is easy to generate laces and the cutting yield is reduced; if the spring force of the circular knife is too large, the knife jump is easily caused and the cutting yield is reduced.
However, the existing project does not have a detection method and a use standard for the elasticity of the circular knife spring. In the actual production process, whether the elasticity of the circular knife spring is suitable or not is judged by an engineer through self experience bottle hand feeling, the accuracy is lower, the unified standard is not available, and the practical service life and the cutting yield of the circular knife are seriously influenced.
Disclosure of Invention
The invention aims to provide a method for making an evaluation standard of a circular knife spring of a splitting machine aiming at the technical defects that the prior art does not have a detection method for the elasticity of the circular knife spring and a use standard.
Another aspect of the present invention is to provide a circular knife spring force test apparatus used in the evaluation method.
The technical scheme adopted for realizing the purpose of the invention is as follows:
a method for evaluating a circular knife spring of a splitting machine comprises the following steps:
step 1: randomly selecting a plurality of circular knife springs as samples;
step 2: preparing a circular knife spring elasticity testing device for detecting the circular knife spring elasticity, detecting the elasticity of the circular knife spring under a certain stroke by using the circular knife spring elasticity testing device,
and step 3: mounting each circular knife spring on a circular knife, and adjusting a splitting machine to split a diaphragm;
and 4, step 4: recording the number of cut meters and the cutting yield when the circular knife is defective;
and 5: repeating the steps 2-4 to finish the test of the circular knife spring sample;
step 6: aiming at each stroke, establishing a mathematical relation model between the spring elasticity of the circular knife under the stroke and the number of the cutting meters and the cutting yield;
and 7: selecting a qualified range from the obtained mathematical relationship model as an evaluation standard;
and 8: and (3) detecting the elasticity of the circular knife spring to be evaluated under a certain stroke by using a circular knife spring elasticity testing device, judging whether the obtained elasticity is in the qualified range of the mathematical relationship model under the stroke obtained in the step (7), wherein the circular knife spring can be used in the qualified range, and needs to be replaced if the obtained elasticity is out of the qualified range.
In the above technical solution, in the step 2, the certain stroke is 0.5mm, 1.0mm or 1.5 mm.
In the above technical solution, in step 4, the defect includes a lace, a non-cut, or a skip.
In the above technical scheme, in step 7, the qualified range is that the number of the cut meters is more than 25 kilometers, and the cut yield is higher than 70%.
The invention also aims to provide a circular knife spring elasticity testing device which comprises a base, a circular knife supporting frame, a displacement driving assembly and a spring dynamometer, wherein the circular knife supporting frame is slidably arranged on the base;
the circular knife spring and the circular knife are installed on the circular knife supporting frame, the displacement driving assembly drives the circular knife spring and the circular knife to generate a stroke relative to the base, and the spring dynamometer is fixedly installed on the base through a first vertical rod to measure the elasticity of the circular knife spring under the stroke.
In the above technical scheme, a displacement scale is arranged on the base to display the stroke.
In the technical scheme, the circular knife supporting frame comprises a U-shaped frame and a cross rod carried on the U-shaped frame, and the circular knife spring and the circular knife are sleeved on the cross rod.
In the technical scheme, a sliding block is arranged below the U-shaped frame and slides along a sliding rail on the base.
In the technical scheme, the displacement driving assembly comprises a horizontally arranged lead screw, a lead screw nut and a vertically arranged pointer; the lead screw is rotatable and relatively fixed with the base, screw nut installs on the lead screw, the upper end of pointer is fixed screw nut is last along with screw nut moves, the pointer middle part with U type frame is fixed to the drive U type frame with the base produces the stroke, the bottom of pointer points to the displacement scale is in order to show produced stroke.
In the technical scheme, one end of the screw rod is rotatably connected to the second vertical rod, the other end of the screw rod is connected with the handle to drive the screw rod to rotate, and the bottom end of the second vertical rod is fixed to the base.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the evaluation method of the circular knife spring of the splitting machine, a certain number of circular knife springs are randomly selected as samples, the elasticity of each circular knife spring and the number of split meters and the split yield of the corresponding circular knife are measured, a mathematical relation model between the elasticity of the circular knife spring and the number of split meters and the split yield of the circular knife is established, and then a qualified range is selected from the obtained mathematical relation model to obtain the evaluation standard of the circular knife spring. The evaluation method can accurately judge whether the circular knife spring meets the requirements or not so as to enable the circular knife to reach the optimal use state, prolong the service life of the circular knife and improve the cutting yield.
2. According to the circular knife spring elasticity testing device provided by the invention, the circular knife spring is driven to generate a certain stroke through the displacement driving assembly, the spring dynamometer detects the elasticity under the stroke, the elasticity is tested after the circular knife spring is installed together with the circular knife, and the use state of the circular knife spring is restored, so that the detection has more persuasion and confidence. The whole structure is simple, the installation is convenient, and the operation is simple.
Drawings
Fig. 1 shows a mathematical relationship model between the spring force of the circular knife and the number of the cut meters and the cut yield corresponding to the 0.5mm stroke in example 1;
fig. 2 is a mathematical relationship model between the spring force of the circular knife and the number of the cut meters and the cut yield corresponding to the 1.0mm stroke in example 1;
fig. 3 shows a mathematical relationship model between the spring force of the circular knife and the number of the cut meters and the cut yield corresponding to the 1.5mm stroke in example 1;
in the figure: a is the number of the cutting meters, and B is the cutting yield.
Fig. 4 is a schematic structural view of the circular knife spring force testing apparatus in embodiment 2.
Figure 5 shows a circular knife and a circular knife spring.
In the figure: the device comprises a base 1, a circular knife supporting frame 2, a U-shaped frame 2-1, a cross rod 2-2, a spring dynamometer 3, a circular knife spring 4, a circular knife 5, a first vertical rod 6, a displacement scale 7, a sliding block 8, a sliding rail 9, a screw rod 10, a pointer 11, a second vertical rod 12 and a handle 13.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A method for making an evaluation standard of a circular knife spring of a splitting machine comprises the following steps:
step 1: randomly selecting 18 circular knife springs as samples;
step 2: preparing a circular knife spring elasticity testing device for detecting the circular knife spring elasticity, and detecting the circular knife spring elasticity under a certain stroke by using the circular knife spring elasticity testing device, wherein 6 circular knife springs are in one group, and the elasticity under the strokes of 0.5mm, 1.0mm and 1.5mm is respectively measured in each group, as shown in table 1;
and step 3: mounting each circular knife spring on a circular knife, and adjusting a splitting machine to split a diaphragm;
and 4, step 4: recording the number of cut meters and the cutting yield when the circular knife is defective;
and 5: repeating the steps 2-4 to finish the test of the sample, wherein the test data are shown in the table 1;
step 6: aiming at each stroke, establishing a mathematical relation model between the spring elasticity of the circular knife under the stroke and the number of the cutting meters and the cutting yield, as shown in figures 1-3;
and 7: selecting a qualified range from the obtained mathematical relationship model as an evaluation standard;
and 8: and (3) detecting the elasticity of the circular knife spring to be evaluated under a certain stroke by using a circular knife spring elasticity testing device, judging whether the obtained elasticity is in the qualified range of the mathematical relationship model under the stroke obtained in the step (7), wherein the circular knife spring can be used in the qualified range, and needs to be replaced if the obtained elasticity is out of the qualified range.
Table 1: circular knife spring test data
As shown in fig. 1-3, as the spring force of the circular knife increases, the number of the circular knife cutting meters increases and then decreases, and the cutting yield increases and then decreases. The qualified range is that the number of the cutting meters is more than 25 ten thousand meters and the cutting yield is higher than 70%, and the circular knife spring is qualified between 11.5N and 14.5N when the stroke is 0.5 mm; when the stroke is 1.0mm, the round knife spring is qualified between 11 and 14N; when the stroke is 1.5mm, the circular knife spring is qualified between 17.5 and 22.5N.
Example 2
A circular knife spring elasticity testing device is shown in figure 4 and comprises a base 1, a circular knife supporting frame 2, a displacement driving assembly and a spring dynamometer 3, wherein the circular knife supporting frame 2 is slidably mounted on the base 1;
circular knife spring 4 and circular knife 5 are installed on circular knife support frame 2, the displacement drive assembly drive circular knife spring 4 and circular knife 5 produce for the stroke of base 1, spring dynamometer 3 is through first montant 6 fixed mounting in order to measure on the base 1 circular knife spring 4 is in the elasticity under this stroke.
The testing process of the circular knife spring elasticity testing device comprises the following steps:
step 1: mounting a circular knife spring and a circular knife on a circular knife supporting frame, and enabling a probe of a spring dynamometer 3 to be in contact with the circular knife;
step 2: starting a displacement driving assembly, and driving the circular knife spring 4 and the circular knife 5 to generate a stroke relative to the base 1 until a target stroke is reached;
and step 3: the spring force gauge 3 measures the elastic force of the circular knife spring at this stroke.
Example 3
Preferably, the base 1 is provided with a displacement scale 7 to display the stroke without separately measuring the stroke.
The circular knife supporting frame 2 comprises a U-shaped frame 2-1 and a cross rod 2-2 carried on the U-shaped frame 2-1 through a bearing, through holes are formed in a circular knife 5 and a circular knife spring 4, a protrusion is formed on the cross rod 2-2 in the circumferential direction, the circular knife 5 and the circular knife spring 4 are sleeved on the cross rod 2-2, the circular knife spring 4 is located between the protrusion and the circular knife 5, and a probe of a spring dynamometer 3 abuts against the circular knife 5.
A sliding block 8 is arranged below the U-shaped frame 2-1, and the sliding block 8 slides along a sliding rail 9 on the base 1.
The displacement driving assembly comprises a lead screw 10, a lead screw nut and a pointer 11, wherein the lead screw and the lead screw nut are horizontally arranged; the lead screw 10 can rotate and is fixed relative to the base 1, a lead screw nut (not shown in the figure) is installed on the lead screw 10, the upper end of the pointer 11 is fixed on the lead screw nut and moves along with the movement of the lead screw nut, the middle part of the pointer 11 is fixed with the U-shaped frame 2-1 so as to drive the U-shaped frame 2-1 and the base 1 to generate a stroke, and the bottom end of the pointer 11 points to the displacement scale 7 so as to display the generated stroke.
One end of the screw rod 10 is rotatably connected to the second vertical rod 12, the other end of the screw rod is connected with a handle 13 to drive the screw rod to rotate, and the bottom end of the second vertical rod 12 is fixed on the base 1.
The handle 13 drives the screw rod 10 to rotate, so that the screw rod nut matched with the handle generates a stroke, the pointer 11 generates a stroke along with the movement of the screw rod nut as the upper end of the pointer 11 is fixed on the screw rod nut, and the middle part of the pointer 11 is fixed with the U-shaped frame 2-1, so that the U-shaped frame 2-1 is driven to generate a stroke. The pointer of the spring dynamometer 3 is in contact with the circular knife, the circular knife is in contact with the circular knife spring, and the spring dynamometer 3 measures the elasticity of the circular knife spring in the travel.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The evaluation method of the circular knife spring of the splitting machine is characterized by comprising the following steps:
step 1: randomly selecting a plurality of circular knife springs as samples;
step 2: preparing a circular knife spring elasticity testing device for detecting the circular knife spring elasticity, detecting the elasticity of the circular knife spring under a certain stroke by using the circular knife spring elasticity testing device,
and step 3: mounting each circular knife spring on a circular knife, and adjusting a splitting machine to split a diaphragm;
and 4, step 4: recording the number of cut meters and the cutting yield when the circular knife is defective;
and 5: repeating the steps 2-4 to finish the test of the circular knife spring sample;
step 6: aiming at each stroke, establishing a mathematical relation model between the spring elasticity of the circular knife under the stroke and the number of the cutting meters and the cutting yield;
and 7: selecting a qualified range from the obtained mathematical relationship model as an evaluation standard;
and 8: detecting the elastic force of the circular knife spring to be evaluated under a certain stroke by using a circular knife spring elastic force testing device, judging whether the obtained elastic force is in the qualified range of the mathematical relationship model under the stroke obtained in the step 7, wherein the circular knife spring can be used in the qualified range, and needs to be replaced if the obtained elastic force is out of the qualified range;
the circular knife spring elasticity testing device comprises a base, a circular knife supporting frame, a displacement driving assembly and a spring dynamometer, wherein the circular knife supporting frame is slidably mounted on the base;
the circular knife spring and the circular knife are installed on the circular knife supporting frame, the displacement driving assembly drives the circular knife spring and the circular knife to generate a stroke relative to the base, and the spring dynamometer is fixedly installed on the base through a first vertical rod to measure the elasticity of the circular knife spring under the stroke.
2. The method for evaluating a circular knife spring of a splitting machine according to claim 1, wherein in the step 2, the certain stroke is 0.5mm, 1.0mm or 1.5 mm.
3. The method for evaluating a circular knife spring of a slitting machine as claimed in claim 2, wherein the failures include lace, uncut or skip in step 4.
4. The method for evaluating the circular knife spring of the splitting machine according to claim 3, characterized in that in the step 7, the qualified range is that the number of the split meters is more than 25 ten thousand meters, and the yield of the split is higher than 70%.
5. The evaluating method for spring of circular knife of splitting machine as claimed in claim 1, characterized in that displacement scale is set on said base to display the stroke.
6. The evaluation method of the circular knife spring of the splitting machine as claimed in claim 5, characterized in that the circular knife supporting frame comprises a U-shaped frame and a cross bar carried on the U-shaped frame, and the circular knife spring and the circular knife are sleeved on the cross bar.
7. The evaluation method of the circular knife spring of the splitting machine as claimed in claim 6, characterized in that a sliding block is arranged below the U-shaped frame, and the sliding block slides along a sliding rail on the base.
8. The evaluating method for circular knife spring of splitting machine according to claim 7, characterized in that said displacement driving assembly comprises a horizontally arranged lead screw, a lead screw nut and a vertically arranged pointer; the lead screw is rotatable and relatively fixed with the base, screw nut installs on the lead screw, the upper end of pointer is fixed screw nut is last along with screw nut moves, the pointer middle part with U type frame is fixed to the drive U type frame with the base produces the stroke, the bottom of pointer points to the displacement scale is in order to show produced stroke.
9. The evaluating method for the spring of the circular knife of the splitting machine as claimed in claim 8, wherein one end of the screw is rotatably connected to the second vertical rod, the other end of the screw is connected with a handle to drive the second vertical rod to rotate, and the bottom end of the second vertical rod is fixed on the base.
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| CN111649883A (en) | 2020-09-11 |
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