CN111289733A - Calibration method for rotor-free vulcanizer torque calibrator - Google Patents
Calibration method for rotor-free vulcanizer torque calibrator Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 24
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- 239000010410 layer Substances 0.000 description 21
- 238000004073 vulcanization Methods 0.000 description 18
- 238000012360 testing method Methods 0.000 description 14
- 239000000463 material Substances 0.000 description 11
- 238000006116 polymerization reaction Methods 0.000 description 9
- 238000005299 abrasion Methods 0.000 description 7
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- 230000000052 comparative effect Effects 0.000 description 5
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- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 3
- 238000005229 chemical vapour deposition Methods 0.000 description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/44—Resins; Plastics; Rubber; Leather
- G01N33/445—Rubber
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
- G01L25/003—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency for measuring torque
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Analytical Chemistry (AREA)
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- General Health & Medical Sciences (AREA)
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- Pathology (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention provides a calibration method of a rotor-free vulcanizer torque calibrator, which comprises the following steps: fixing the torque calibrator on the calibrating device; adding a hanging weight on a lever of the calibration device to enable the torque calibrator to be twisted to a nominal angle, and reading a torque indication value T on the torque calibrator; and calculating a torque standard value T 'according to the weight additionally hung on the lever, and calibrating the torque standard value T based on the torque standard value T'. The device used by the calibration method is also disclosed, and the calibration precision and the service life of the device are obviously improved.
Description
Technical Field
The invention relates to the technical field of measurement and metering, in particular to a calibration method of a torque calibrator, and more particularly relates to a calibration method of a rotor-free vulcanizer torque calibrator and a device used by the same.
Background
In the process of rubber vulcanization, rubber macromolecules are crosslinked under the conditions of temperature, pressure and time to form a three-dimensional network structure, so that the plasticity of a rubber material is eliminated, the elasticity is increased, the modulus is increased, the strain of the rubber material generated under stress is reduced along with the increase of the modulus, the stress required by the strain is increased, and the crosslinking performance of the rubber material is obtained. The method is based on the principle that the vulcanization state of the rubber material is reflected according to the condition that the shear modulus of the rubber material changes along with time at the vulcanization temperature, and the vulcanization characteristic of the rubber material is obtained by measuring the magnitude of the action moment of the rubber material on a mold body which swings back and forth.
The vulcanization instrument is generally divided into two types according to the structure of a mold cavity, wherein the first type is a non-contact sealing type (namely, rubber material self-sealing type) and the second type is a contact sealing type (namely, rubber sealing ring sealing type). The two versions of the vulcanizers are identical in respect of mold body oscillation and torque measurement, except for the sealing. The measuring device of the torque required by the swinging die body can adopt an upper torque measuring system (namely an upper torque calibrator) or a lower torque measuring system (namely a lower torque calibrator).
In use, the accuracy of the rotor-less vulcanizers is affected by various factors, such as wear in use, fluctuation of personnel and environment, etc., which cause data deviation, so that the vulcanizers need to be calibrated regularly to realize accurate detection.
CN210051770U discloses a rotor-free rubber vulcanization instrument, which is used for a test room for performing vulcanization characteristic experiments on rubber samples and adopts a closed structure formed by glass panels; the rotor-free vulcanizing instrument is provided with a purification and odor removal device for purifying a rubber sample to generate harmful gas in a vulcanization characteristic experiment; the rubber sample cutting device also comprises an operating device for placing and cutting the rubber sample.
CN109752514A discloses no rotor vulcameter easily goes up and down, including base, walking beam, torque sensor, last die cavity, lower die cavity, cylinder, stroke stand, the stroke stand is installed around the base, and the lower die cavity is installed in the middle of the base, and the walking beam cup joints on the stroke stand, and the cylinder is installed in the walking beam upper end, goes up the die cavity and installs at the walking beam lower extreme and correspond with the lower die cavity, and torque sensor installs on the walking beam and is connected with last die cavity, go up and be equipped with the cylinder copper billet between die cavity and the lower die cavity, cylinder copper billet up end is equipped with the upper groove, the terminal surface is equipped with the low groove under the cylinder copper billet, and galvanic couple line jack has been seted up at the middle part of cylinder copper billet, be equipped with the.
CN208476933U discloses no rotor vulcanization appearance that seal is good, including no rotor vulcanization appearance main part, the upper end surface of no rotor vulcanization appearance main part is provided with machine part shell, the front end surface of machine part shell is provided with the cabinet door, the inside of no rotor vulcanization appearance main part is provided with die body and lower die body, last die body is located the top of die body down, the front end surface of control part shell is provided with collapsible apron and no rotor vulcanization appearance control panel.
CN203732534U discloses a detection device for detecting the vulcanization speed of rubber, which is placed on a table of a flat vulcanizing machine when detecting the vulcanization speed of a sample rubber, and the flat vulcanizing machine pressurizes the table; the device comprises a middle template for placing sample rubber and a pressure-bearing template for bearing the pressure of a flat vulcanizing machine.
CN110726832A discloses a novel vulcanization appearance, including shell and workstation, wherein the top surface is equipped with the air exhauster on the shell, the air exhauster is connected with out the tuber pipe, the shell the inside is close to one side and is equipped with the guide rail perpendicularly, the adaptation is equipped with first slider and second slider on the guide rail, first slider with workstation horizontal fixed connection, first slider with the second slider all is equipped with locking screw, be equipped with the baffle around above the workstation, shell the inside top is equipped with the record appearance.
CN108072677A discloses an operation method of a rubber vulcanization instrument, comprising the following steps: the first step is as follows: preparing a sample; the second step is that: opening a green power switch and an orange air source switch on a panel of the rubber vulcanization instrument; the third step: opening a computer display, a host and a printer, entering a Windows XP system, clicking parameter setting and automatically heating; the fourth step: shearing a piece of unvulcanized raw material, weighing the raw material on an electronic scale, and putting the sample on a rubber vulcanization instrument; the fifth step: placing a piece of high-temperature-resistant isolation paper on each of the upper and lower sides of the rubber material, then placing the material in an intermediate point for resetting, and performing a click test; and a sixth step: and the equipment starts to work and displays a test curve, the die cavity automatically ascends after the test time is finished, the test result is displayed, the rubber material is taken out of the die cavity, the data is stored or printed, and the test is finished.
CN104297460A discloses novel no rotor vulcanizes appearance, the power distribution box comprises a box body, the box lower extreme is the transmission case, and the box upper end is equipped with the lift transparency door, and the transmission case top is equipped with the frame, and the frame lower extreme is equipped with down the die cavity, and the frame top is equipped with the cylinder, and the piston rod lower extreme of cylinder is connected with last die cavity in the frame, goes up the die cavity and corresponds with lower die cavity, is equipped with high temperature resistant tetrafluoro connecting piece between the piston rod of cylinder and the last die cavity.
"study on difference between instrument display and standard setting of vulcanization temperature", jiao li shi, etc., shanxi chemical industry, total 175 th stage, 3 rd stage of 2018, and discloses that after a flat vulcanizing machine with qualified calibration is adopted and an intelligent display regulator is corrected, rubber products are vulcanized respectively, and the detection results of vulcanization effect and physical property of vulcanized rubber products of one mold or two molds are compared, and the result shows that the basic fluctuation range of the set temperature is +/-4 ℃, the vulcanization of one mold or two molds has no influence on the physical and mechanical properties of the products, but the vulcanization degree of two molds is deeper than that of one mold.
However, in the art, calibration of the rotorless cure meter torque calibrator is typically performed using reference film, or using a calibration device. However, when the calibration is performed using the reference film, the standard reference film is expensive, and the reference film itself is also subject to aging, so that the calibration accuracy is deteriorated. When using conventional calibration devices, the connection of the device to the torque calibrator is often very complicated, additional fixing devices are required, for example screws are required for fixing the torque, so that screw holes are required to be provided on the torque, the calibration device and the torque calibrator are both required to be specially designed for using the fixing devices, the design is complicated and the cost is high, or a gap exists in the connection between the calibration device and the torque calibrator, and the existence of the gap can cause calibration errors during rotational calibration.
Therefore, a calibration method and a device for the rotor-free vulkameter torque calibrator with convenient installation and high calibration precision are needed.
Disclosure of Invention
In order to overcome the technical problems, the inventor provides a calibration method of a rotor-free vulcanizer torque calibrator by using a calibration device which can perform calibration very accurately and rapidly through intensive research and combined system development.
In one aspect of the invention, a calibration method for a rotor-less vulkameter torque calibrator is provided, the method comprising: (1) fixing the torque calibrator on the calibrating device; (2) adding a hanging weight on a lever of the calibration device to enable the torque calibrator to be twisted to a nominal angle, and reading a torque indication value T on the torque calibrator; (3) and calculating a torque standard value T 'according to the weight additionally hung on the lever, and calibrating the torque standard value T based on the torque standard value T'.
Preferably, in the method, T is measured at least n times and the arithmetic mean is calculated
Wherein n.gtoreq.3, preferably 6.
Preferably, the torque indication T is read by an electrical signal.
In the formula:
δT-torque indication error;
t- -reading the torque indication T, Nm on the torque calibrator;
Tmax-maximum value of T read, Nm;
Tmin-minimum value of T read, Nm;
t '- - - - - - - - - - -weight calculation torque standard value T', Nm.
Preferably, deltaTLess than 0.1%, more preferably less than 0.05%.
Preferably, RTLess than 0.5%, more preferably less than 0.1%.
Preferably, the torque calibrator is fixed on the calibration device in a clamping manner.
Preferably, the calibration device has a snap-in sleeve which can fix one end of the torque calibrator.
In another aspect of the invention, a calibration device for carrying out the calibration method according to the above is provided, the device comprising a rotation shaft, a bayonet sleeve and a lever.
Preferably, the clamping sleeve is cylindrical and the central shaft is connected to and coaxial with the rotating shaft. That is, the bayonet sleeve is coaxially connected to the rotary shaft in its axial direction.
Preferably, the rotation shaft is perpendicularly connected to the lever.
Preferably, the joint sleeve has the joint bellying, the one end of torque calibration ware have with joint bellying looks joint complex concave part, bellying and concave part clearance when the joint is less than 0.02mm, more preferably less than 0.01 mm.
Preferably, the inside of the clamping sleeve has a lining.
Preferably, the thickness of the liner is 1.0 μm to 10.0 μm, preferably 2.0 μm to 5.0 μm.
If the liner is too thin, wear resistance is not guaranteed. After multiple uses, wear easily occurs, thereby affecting the use. If the thickness is too large, the production process cost is high, and the clamping convex part and the concave part are easy to slide or twist due to the elasticity of the lining layer, so that the calibration accuracy is influenced.
The performance requirements of the liner are very high, both to ensure a certain degree of lubrication and at the same time to have a certain rigidity. If the degree of lubrication or smoothness is insufficient, the snap fit is very difficult. If the rigidity is insufficient, for example, if the liner is an elastic material, rotational hysteresis due to elastic deformation tends to occur during rotation, that is, the rotational shaft and the drum cannot be rotated in complete synchronism, resulting in misalignment of the alignment.
Another liner, which has been developed in association with scientific research institutes, is a polymer layer.
The polymer layer is formed by polymerizing a monomer polymer on the surface, in particular the inner surface, of the clamping sleeve by means of a chemical vapour deposition process.
In the chemical vapor deposition, the polymer monomers used are in the gaseous state, for example in the form of a vapor, i.e. are supplied as a gas or vapor.
The polymerized monomer is at least one of monomer compounds shown in the following formula (I) or (II), namely, the polymerized monomer can be a monomer shown in the formula (I), a monomer shown in the formula (II) or a composition of the monomer and the monomer:
particularly preferably, the polymerized monomer is a mixture of monomer compounds represented by formula (I) or (II). When a mixture of the two is selected, the molar ratio of the polymerized monomer of formula (I) to the polymerized monomer of formula (II) is preferably from 1:2 to 1: 5.
Preferably, the chemical vapor deposition is performed by means of plasma polymerization.
The plasma polymerization may be performed by generating plasma by a Radio Frequency (RF) method. Preferably, the plasma polymerization is conducted under subatmospheric conditions.
A carrier gas may be used in the plasma polymerization. The carrier gas may be an inert gas such as helium or argon.
The volume ratio of the polymerization monomer gas to the carrier gas is preferably 1:1 to 1:100, more preferably 1:10 to 1:100, most preferably 1:10 to 1: 50.
During polymerization, the clamping sleeve is placed into the deposition chamber, the gas in the deposition chamber is then evacuated, and the carrier gas and the polymerized monomer gas are then fed into the deposition chamber.
The pressure of the polymerization is preferably 20 mTorr to 200 mTorr, more preferably 30 mTorr to 150 mTorr.
The polymerization can be initiated within the deposition chamber by applying a high frequency voltage to initiate a glow discharge. The polymerization reaction is stopped when the thickness of the polymer layer is reached.
The discharge power is preferably 100w/m3-300w/m3For a time sufficient to apply a voltage as a pulsed field to form a polymer layer on the surface of the substrate.
Compared with a mechanically applied lining, the method according to the invention enables a polymer layer to be formed on the surface (preferably the inner surface) of the clamping sleeve in a particularly form-fitting manner, with a strong bond and with significantly better hardness, surface roughness and wear resistance. Taking adhesion (% peel) as an example, this can be increased by a factor of 5 to 8 compared with mechanically applied underlayers.
The polymer layer formed using the above-mentioned monomer of the present invention also has good lubricity, i.e., smoothness and abrasion resistance. In the monomer, the introduction of the fluorine-containing side chain group enables the polymer layer to have certain rigidity and strong wear resistance and corrosion resistance.
The polymer layer can also effectively play a role of a protective layer, and can prevent the surface of the clamping sleeve from being rusted. This effect is particularly interesting because, as a rule, the time between each calibration is relatively long, and the calibration device must have a relatively long service life, so that high demands are made on the rust protection of the bayonet sleeve.
Particularly preferably, by using a combination of the two monomers mentioned above, it is possible on the one hand to provide a strong bond between the polymer layer and the clamping sleeve surface, particularly, the existence of the bi-acrylic group in the monomer shown in the formula (I) enables the polymer to have strong bonding force, the polymer layer also has strong tensile strength and tear resistance, thereby prolonging the protection life of the lining layer, improving the lubricating property of the polymer layer on the other hand, facilitating the clamping matching, easily realizing the fixation of the torque calibrator, thereby avoiding the deformation or damage possibly caused by other fixing modes, and simultaneously having certain rigidity to prevent the rotation from being delayed due to larger elasticity, thereby influencing the calibration precision, this property is attributed to the presence of the fluorine-containing side chain in the polymer monomer represented by formula (II), and the presence of the fluorine-containing group significantly increases the rigidity of the backing layer.
Drawings
The invention will be further described with reference to the drawings, to which, however, the examples do not constitute any limitation.
FIG. 1 is a schematic diagram of a torque calibrator, wherein 1-1 represents a torque spring rod;
FIG. 2 is a view of the apparatus for rotor-less vulkameter torque calibrator calibration according to the present invention, showing the basic structural relationship of the calibration operation, wherein 1 is a rotation shaft, 2 is a lever, 3 is a clamping sleeve, and 4 is a torque calibrator;
FIG. 3 is a 10X 10 μm AFM image of a plasma polymer coating according to example 1 of the present invention.
Detailed Description
The present invention will be described below with reference to specific embodiments.
Example 1
Placing the bayonet sleeve in a plasma chamber, evacuating the chamber to a pressure of about 8 mtorr, then passing helium through it at a rate of 20sccm until a pressure of 60 mtorr, then initiating a glow discharge using RF at a frequency and power of 13.56MHz and 300W for 5 minutes, then introducing the vapour of the monomer mixture of formulae (I) and (II) (molar ratio 1:3) into the chamber at a rate of 240mg/min and switching the plasma to a pulsed plasma of the following characteristics: the peak power was 120W, the frequency was 50Hz and the duty cycle was 5% for 45min, so that a continuous and uniform polymer layer was formed on the inner surface of the clamping sleeve, the thickness of the polymer layer being measured to be 2.10 μm.
Example 2
Example 1 was repeated except that the polymer monomer of example 2 was only the monomer represented by formula (II), plasma deposition was continued for 50min, and the thickness of the polymer layer was measured to be 2.12 μm.
Comparative example 1
Example 1 was repeated except that the polymer monomer of comparative example 1 was only an acrylate monomer (available from green leaves chemical, guangzhou), plasma deposition was continued for 38min and the thickness of the polymer layer was measured to be 2.13 μm.
In the above examples and comparative examples, the thickness of the polymer layer finally obtained was substantially uniform, and thus had a comparative basis and meaning.
Testing the performance of the polymer layer of the clamping sleeve, wherein the hardness test refers to GB/T6739-2006, and the test is carried out by using a QAT portable pencil scratch testing machine; the adhesion test is carried out by using a QFH (quad Flat No-lead) paint film cutting instrument according to GB/T4893.4-2013; the abrasion resistance test refers to GB/T4893.8-2013, a BGD523 paint film abrasion instrument is used for testing, the weight mass is 500g, the abrasion rotating speed is 60r/min, the abrasion number of turns is 50r, 1 abrasion loss mass is recorded every 10r, and the average value of 3 samples is taken. The test results are shown in table 1 below:
table 1: comparison of Properties of different Polymer layers
As is clear from the above examples and comparative examples, the polymer coating of the present invention has particularly good adhesion due to the bisacrylic group contained in the polymer monomer (I), and in addition, the use of the fluorine chain-containing polymer monomer (I) provides the polymer coating with particularly good hardness and abrasion resistance. In addition, the use of the fluorine-chain-containing polymer monomer (I) also allows the surface roughness of the polymer coating to be improved. The improvement of the performances enables the clamping connection between the clamping connection sleeve and the torque calibrator to be particularly smooth, the service life is obviously prolonged, a small clamping connection gap between the clamping connection sleeve and the torque calibrator can be ensured after the clamping connection, certain rigidity can be ensured, and the generation of rotation delay caused by high elasticity of the coating is avoided, so that the calibration deviation is caused.
This written description uses examples to disclose the invention, including the best mode, and also to enable any person skilled in the art to make and use the invention. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims. All citations referred to herein are incorporated herein by reference to the extent that no inconsistency is made.
Claims (10)
1. The calibration method of the rotor-free vulcanizer torque calibrator is characterized by comprising the following steps of: (1) fixing the torque calibrator on the calibrating device; (2) adding a hanging weight on a lever of the calibration device to enable the torque calibrator to be twisted to a nominal angle, and reading a torque indication value T on the torque calibrator; (3) and calculating a torque standard value T 'according to the weight additionally hung on the lever, and calibrating the torque standard value T based on the torque standard value T'.
2. The method of claim 1, wherein T is measured at least n times and an arithmetic mean is calculated
Wherein n is more than or equal to 3.
3. A method according to claim 1 or 2, wherein the reading of the torque indication T is by an electrical signal.
4. Method according to any one of the preceding claims, characterized in that the torque calibrator is fastened to the calibration device by means of a snap-fit.
5. Method according to any of the preceding claims, characterized in that the calibration device has a snap-in sleeve which can fix one end of the torque calibrator.
6. A calibration device for carrying out the method according to any one of claims 1 to 5, characterized in that the device comprises a rotation shaft, a bayonet sleeve and a lever.
7. The calibration device of claim 6, wherein the bayonet sleeve is cylindrical and is connected to the rotary shaft in its axial direction.
8. A calibration device according to claim 6 or 7, wherein the rotation axis is perpendicularly connected to the lever.
9. The calibration device according to any one of claims 6 to 8, wherein the clamping sleeve is provided with a clamping convex part, one end of the torque calibrator is provided with a concave part matched with the clamping convex part in a clamping way, and the clearance between the convex part and the concave part is less than 0.02 mm.
10. Calibration device according to any one of claims 6-9, characterized in that the inside of the clamping sleeve is lined.
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| CN202010233244.XA CN111289733A (en) | 2020-03-29 | 2020-03-29 | Calibration method for rotor-free vulcanizer torque calibrator |
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| CN202010233244.XA CN111289733A (en) | 2020-03-29 | 2020-03-29 | Calibration method for rotor-free vulcanizer torque calibrator |
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