CN212111022U - Mechanical direct-connected micro-torque transmission mechanism for Gieseler fluidity tester - Google Patents
Mechanical direct-connected micro-torque transmission mechanism for Gieseler fluidity tester Download PDFInfo
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- CN212111022U CN212111022U CN202020324700.7U CN202020324700U CN212111022U CN 212111022 U CN212111022 U CN 212111022U CN 202020324700 U CN202020324700 U CN 202020324700U CN 212111022 U CN212111022 U CN 212111022U
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Abstract
The utility model relates to a mechanical direct-coupled micro torque transmission mechanism for a Gieseler fluidity tester, which comprises a power source unit, an electromagnetic clutch unit and a torque output unit; the power source unit comprises a rotary driving device, the electromagnetic clutch unit comprises an electromagnetic clutch, an input shaft, an output shaft and a constant current source, and a power source interface of the electromagnetic clutch is connected with the constant current source; the torque output unit comprises a transmission shaft, an encoder and a sliding coupler; one end of the electromagnetic clutch is provided with an input shaft, the other end of the electromagnetic clutch is provided with an output shaft, the input shaft is connected with a rotating shaft of the rotating driving device, and the output shaft is connected with the transmission shaft; the bottom of the transmission shaft is provided with a sliding coupling connected with the stirring paddle. The utility model adopts the mechanical direct-coupled design to realize precise micro torque output; the torque is changed by adjusting the current of the electromagnetic clutch; the laser displacement sensor is used for detecting the jumping quantity of the rotating shaft to realize the monitoring of slight vibration and failure, and the real-time output of precise micro torque is ensured to have higher reliability.
Description
Technical Field
The utility model relates to a coking industry coal performance evaluation technical field especially relates to a small torque transmission mechanism of mechanical associated mode for Gieseler fluidity apparatus.
Background
Due to the influence of comprehensive factors such as late starting, limited manufacturing level and the like, the research on domestic instruments and equipment for measuring the Gieseler fluidity has not been substantially progressed, and basically depends on imported machine types. With the technical progress and the domestic importance on the application of the equipment, similar products are successively introduced, but the precision requirements are difficult to meet from the aspects of service performance, principle and structure, so that the domestic equipment cannot meet the use requirements until now.
For example, similar devices imported from the united states have poor reliability in precision stability, which is mainly indicated by unstable output torque under high rotation speed conditions, but has the greater disadvantage that the torque changes randomly and cannot be monitored during use. The measurement results of the same sample are different, so that the commodity inspection and the data index are easy to generate ambiguity when being compared transversely.
The similar devices proposed in China have the following main disadvantages: firstly, the transmission principle is unscientific, for example, the transmission mode of indirect transmission (similar to the transmission mode of a rubber belt and the like) is adopted for precise torque output, and the transmission mode can not obtain precise output torque fundamentally. Secondly, unstable factors exist in the transmission process, for example, vibration, noise and the like exist in the transmission process, and finally, the unstable factors can be applied to the detection result of the sample.
Disclosure of Invention
The utility model provides a mechanical direct-coupled micro torque transmission mechanism for a Gieseler fluidity tester, which adopts a mechanical direct-coupled design to realize precise micro torque output; the torque is changed by adjusting the current of the electromagnetic clutch; the laser displacement sensor is used for detecting the jumping quantity of the rotating shaft to realize the monitoring of slight vibration and failure, and the real-time output of precise micro torque is ensured to have higher reliability.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a mechanical direct-connected micro torque transmission mechanism for a Gieseler fluidity tester comprises a power source unit, an electromagnetic clutch unit and a torque output unit which are sequentially arranged from top to bottom; the power source unit comprises a rotary driving device, the electromagnetic clutch unit comprises an electromagnetic clutch, an input shaft, an output shaft and a constant current source, and a power source interface of the electromagnetic clutch is connected with the constant current source; the torque output unit comprises a transmission shaft, an encoder and a sliding coupler; one end of the electromagnetic clutch is provided with an input shaft, the other end of the electromagnetic clutch is provided with an output shaft, the input shaft is connected with a rotating shaft of the rotating driving device, and the output shaft is connected with the transmission shaft; the electromagnetic clutch, the input shaft, the output shaft and the transmission shaft are all coaxially arranged with a rotating shaft of the rotary driving device; the bottom end of the transmission shaft is provided with a sliding coupling which is movably connected with the stirring paddle; one side of the input shaft is provided with a first laser displacement sensor, and one side of the transmission shaft is provided with a second laser displacement sensor; the encoder is a split encoder, and a coded disc of the encoder is arranged on the transmission shaft; the rotary driving device, the constant current source, the first laser displacement sensor, the second laser displacement sensor and the encoder are respectively connected with a control system of the Gieseler fluidity tester.
A mechanical direct-coupled micro torque transmission mechanism for a Gieseler fluidity tester also comprises a rack, wherein an upper layer clapboard and a lower layer clapboard are arranged in the rack to divide the rack into 3 spaces; the rotary driving device is fixed on the upper-layer partition plate, and the encoder body is arranged on a bottom plate of the rack; the first laser displacement sensor and the second laser displacement sensor are both mounted on the rack.
The rotation driving device is an alternating current motor or a direct current motor.
The rotation driving device is an alternating current servo motor or a direct current servo motor, and the rotating speed adjusting range is 0-3000 r/min.
The input shaft is connected with a rotating shaft of the rotary driving device through a first coupling, and the output shaft is connected with a transmission shaft through a second coupling; the first coupler and the second coupler are rigid couplers or flexible couplers.
The electromagnetic clutch is replaced by a permanent magnetic clutch.
The constant current source is a high-precision digital constant current source and has a temperature compensation function.
Compared with the prior art, the beneficial effects of the utility model are that:
a mechanical direct-connected design is adopted to realize precise tiny torque output; the torque is changed by adjusting the current of the electromagnetic clutch; the laser displacement sensor is used for detecting the jumping quantity of the rotating shaft to realize the monitoring of slight vibration and failure, and the real-time output of precise micro torque is ensured to have higher reliability.
Drawings
Fig. 1 is a schematic structural diagram (without a frame) of a mechanical direct-coupled micro torque transmission mechanism for a coriolis fluidity tester of the present invention.
Fig. 2 is a schematic structural diagram (including a frame) of a mechanical direct-coupled micro torque transmission mechanism for a kirschner fluidity tester of the present invention.
In the figure: 1. the rotary driving device comprises a rack 2, a rotary driving device 3, an upper layer clapboard 4, a first coupler 5, an input shaft 6, a lower layer clapboard 7, an electromagnetic clutch 8, an output shaft 9, a second coupler 10, a transmission shaft 11, an encoder body 12, a coded disc 13 of an encoder, a bottom plate 14, a sliding coupler 15, a stirring paddle 16, a support 17, a first laser displacement sensor 18, a constant current source 19, a second laser displacement sensor 20, a combination and separator 21, a radiating fin 22, a radiating hole 23 and a bearing
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1, the mechanical direct-coupled micro torque transmission mechanism for a kirschner fluidity tester of the present invention comprises a power source unit, an electromagnetic clutch unit and a torque output unit, which are sequentially arranged from top to bottom; the power source unit comprises a rotary driving device 2, the electromagnetic clutch unit comprises an electromagnetic clutch 7, an input shaft 5, an output shaft 8 and a constant current source 18, and a power source interface of the electromagnetic clutch 7 is connected with the constant current source 18; the torque output unit comprises a transmission shaft 10, an encoder and a sliding coupler 14; one end of the electromagnetic clutch 7 is provided with an input shaft 5, the other end is provided with an output shaft 8, the input shaft 5 is connected with a rotating shaft of the rotary driving device 2, and the output shaft 8 is connected with a transmission shaft 10; the electromagnetic clutch 7, the input shaft 5, the output shaft 8 and the transmission shaft 10 are all arranged coaxially with the rotating shaft of the rotary driving device 2; the bottom end of the transmission shaft 10 is provided with a sliding coupling 14 for movably connecting with a stirring paddle 15; a first laser displacement sensor 17 is arranged on one side of the input shaft 5, and a second laser displacement sensor 19 is arranged on one side of the transmission shaft 10; the encoder is a split encoder, and a coded disc 12 of the encoder is arranged on the transmission shaft 10; the rotation driving device 2, the constant current source 18, the first laser displacement sensor 17, the second laser displacement sensor 19 and the encoder are respectively connected with a control system of the Gieseler fluidity tester.
As shown in fig. 2, the mechanical direct-coupled micro torque transmission mechanism for the kirschner fluidity tester of the present invention further comprises a frame 1, wherein an upper layer partition plate 3 and a lower layer partition plate 6 are arranged in the frame 1, and the frame 1 is divided into 3 spaces; the rotary driving device 2 is fixed on the upper layer clapboard 3, and the encoder body 11 is arranged on the bottom plate of the frame 1; the first laser displacement sensor 17 and the second laser displacement sensor 19 are both mounted on the machine frame 1.
The rotation driving device 2 is an alternating current motor or a direct current motor.
The rotation driving device 2 is an alternating current servo motor or a direct current servo motor, and the rotating speed adjusting range is 0-3000 r/min.
The input shaft 5 is connected with a rotating shaft of the rotary driving device 2 through a first coupling 4, and the output shaft 8 is connected with a transmission shaft 10 through a second coupling 9; the first coupling 4 and the second coupling 9 are rigid couplings or flexible couplings.
The electromagnetic clutch 7 is replaced by a permanent magnetic clutch.
The constant current source 18 is a high-precision digital constant current source and has a temperature compensation function.
The rack 1 is manufactured by high-precision CNC machining, the rotary driving device 2 is fixed on the upper-layer partition plate 3, a rotary shaft of the rotary driving device 2 penetrates through the upper-layer partition plate 3 and then is connected with one end of a first coupling 4, the other end of the first coupling 4 is connected with an input shaft 5 of an electromagnetic clutch 7 in a matched mode, and the electromagnetic clutch 7 is fixed on a lower-layer partition plate 6.
The torque adjustment is realized through a constant current source matched with the electromagnetic clutch 7, an output shaft 8 of the electromagnetic clutch 7 is connected with one end of a second coupling 9, the other end of the second coupling 9 is connected with the upper end of a transmission shaft 10, a coded disc 12 of an encoder is installed on the transmission shaft 10, and an encoder body 11 is fixed on a bottom plate 13.
A first laser displacement sensor and a second laser displacement sensor for detecting circular runout are respectively fixed on the rack 1, wherein the first laser displacement sensor is installed on the lower-layer partition plate 6, and the second laser displacement sensor is installed on the side wall of the rack 1 through a support 16. The lower end of the transmission shaft 10 is provided with a sliding coupling 18, and the sliding coupling 18 is used for realizing the combination or separation with the stirring paddle 20.
As shown in fig. 2, in order to ensure the transmission precision, a combining and separating device 20 can be further installed at the bottom of the frame 1, the rapid combining and separating with the coal retort outside the stirring paddle 15 can be realized by adopting a clamping manner, the main body of the combining and separating device 20 is of a sleeve type structure, and the central axis of the combining and separating device is collinear with the central axis of the electromagnetic clutch 7 and the central axis of the rotating shaft on the rotary driving device 2. In order to ensure the stability and physical support of the rotation of the transmission shaft 10, the transmission shaft 10 is connected with the combining and separating device 20 through 2 bearings 23, and the 2 bearings 23 are respectively embedded in grooves correspondingly formed in the combining and separating device 20. After the combination and separator 20 is installed, in order to minimize the influence of high temperature heat, the combination and separator 20 is externally provided with heat dissipation fins 21 for heat dissipation, and at the same time, the upper portion thereof is provided with heat dissipation holes 22 along the circumferential direction, so that heat dissipation is further performed by using air convection.
The utility model relates to a basic shi mobility apparatus is with small torque transmission mechanism of mechanical associated mode's functional characteristics as follows:
1. the precise tiny torque output is realized by adopting the design of mechanical direct connection;
as shown in fig. 1, the central axes of the rotating components connected in the three parts of the power source unit, the electromagnetic clutch unit and the torque output unit are all coaxially arranged, which is one of the typical features of the mechanical direct connection of the present invention.
The rotary driving device 2 has the capability of adjusting within the rotating speed range of 0-3000 r/min, and is stable and has very good dynamic balance force.
The electromagnetic clutch 7 is used for obtaining a required standard torque at one end of an output shaft 8 thereof under the condition that a certain current is supplied to the electromagnetic clutch, and the torque is as follows: 101.6. + -. 5.0 g.cm, equivalent to 0.00996. + -. 0.0005 N.m. Meanwhile, in order to meet the extensive experimental requirements, the torque should have a certain adjustable range, and the adjustable range is more than 0-200 g-cm, but it should be noted that the larger the maximum torque of the electromagnetic clutch 7 is, the larger the influence on the accuracy of the output torque is.
The transmission shaft 10 is correspondingly provided with an encoder 11, a split encoder is adopted, only a coded disc of the encoder 11 is arranged on the transmission shaft 10, no damping is generated when the coded disc rotates under driving, meanwhile, the rotational inertia of the encoder 11 is required to be as small as possible, and otherwise, the sensitivity of output torque is influenced.
The end of the drive shaft 10 is provided with a slip coupling 18 for connection to the upper axial end of the paddle 20 to achieve a desired precision torque of the paddle 20.
2. The torque is changed by adjusting the current of the electromagnetic clutch;
the utility model discloses in, the key part that influences output torque size and accuracy is electromagnetic clutch 7, and electromagnetic clutch 7 is through the electric current and produces magnetic field, and the size in magnetic field directly changes the moment of torsion at its output axle head. In order to ensure that the high-precision micro torque can be output, a high-precision digital constant current source is required to drive, and the constant current source not only ensures that the current output is stable and precise, but also has a temperature compensation function to compensate the micro error possibly generated by the torque output due to the change of the environmental temperature. By adjusting a proper current value, a corresponding torque can be obtained on the output shaft 8 of the electromagnetic clutch 7, that is, the magnitude of the current value and the torque have a one-to-one linear relationship. The constant current source receives the pulse quantity from the control system, and the magnitude of the current value can be changed by changing the pulse quantity. This is a relatively general conventional technique and will not be described in detail here. Due to the fact that digital adjustment is achieved, through practical verification, the current adjustment resolution can reach 0.001mA, and therefore torque output with higher precision can be achieved. And the temperature compensation function of the constant current source ensures that the torque has excellent stability in the dynamic use process.
In practical use of the kirschner-based fluidity tester, the paddle is placed in a coal sample, and when the state of the coal sample changes due to changes in external conditions, a reaction force, that is, a load torque, is generated on the paddle, and the load torque interacts with the output torque of the electromagnetic clutch 7.
When the load torque is equal to or greater than the output torque set by the electromagnetic clutch 7, the rotational speed of the output shaft of the electromagnetic clutch 7 becomes zero, and the rotation of the rotating member of the torque output unit is stopped. At this time, the rotation driving device 2 is still rotated at the original set rotation speed. When the load torque is 0, the rotation speed of the paddle is the same as that of the rotation driving device 2. When the load torque is less than the output torque set by the electromagnetic clutch 7, a variable rotation speed is obtained on the stirring paddle, and the rotation speed depends on the instant load torque of the coal sample. As can be seen from the above, the rated output torque of the rotary drive device 2 is larger than the load torque during use of the coriolis fluidity tester.
The change of the rotating speed of the rotating part in the torque output unit is measured by the encoder 11, and the principle that the encoder 11 measures the rotating speed belongs to the general technology, so the details are not repeated. The torque change of the coal sample state is finally reflected in the rotation speed measured by the encoder 11, and the total rotation speed in a certain time course can be measured after the rotation speed in a unit time is measured, and the step can be automatically processed by the control system.
The maximum measuring capacity of the encoder 11 is determined by the highest rotating speed of the rotary driving device and the resolution precision of the encoder 11, when the electromagnetic clutch 7 operates within the characteristic range, the highest rotating speed of the rotary driving device 2 can reach 3000r/min, if the encoder 11 adopts a 1000-line specification, the highest measuring capacity is 3000r/min multiplied by 1000 lines, 3000,000 pulses/min can be obtained by a control system, the working condition requirements of all coal samples can be met, and meanwhile, compared with a foreign imported machine type, the measured maximum capacity is higher by one order of magnitude.
The utility model discloses in, electromagnetic clutch 7 also can be replaced by permanent magnetic clutch, and permanent magnetic clutch adopts the magnetic field that permanent magnet formed to produce moment, changes the moment of torsion size of output through the relative position (distance) of adjusting the permanent magnet. The output torque of the permanent magnetic clutch can only be manually adjusted, and cannot be digitalized and necessary temperature compensation cannot be performed. In particular, Nd2Fe 14B-based magnetic materials are susceptible to temperature, and their magnetic properties disappear over time as the temperature increases. Permanent magnet clutches are generally not recommended due to their unstable nature. However, the permanent magnetic clutch has simple structure, easy manufacture and low price, so the permanent magnetic clutch can be applied according to the requirement.
In addition, the permanent magnet clutch has a circumferential pulse vibration type torque due to the physical structural characteristics, the output torque is influenced when the pulse vibration value is high, and the torque output cannot meet the precision requirement due to excessive pulse vibration. Simultaneously, the permanent magnet clutch can produce great vibrations when high-speed rotatory, and this kind of vibrations also can lead to the noise, and is very serious to the influence of coal sample, can directly lead to the parallel repeatability variation of sample result.
3. The laser displacement sensor is used for detecting the jumping quantity of the rotating shaft, so that the monitoring of slight self vibration and failure is realized, and meanwhile, the laser displacement sensor is used for ensuring the real-time output reliability of precise micro torque;
the prior Gieseler fluidity tester has the following problems in the using process:
3.1 Effect of ambient temperature on minute torques:
at present, no method for proving that the torque is stable and reliable in the working process interval of the imported equipment or other similar equipment instruments can be used for calibrating only in the non-working state, but the imported equipment or other similar equipment instruments cannot prove whether the imported equipment or other similar equipment instruments change in the working process. Because the experiment is under certain high temperature, all bearings and shaft type rotating motion parts can generate thermal expansion deformation, the deformation quantity can cause the change of mechanical matching degree, if the influence is more than the tolerance degree, the influence can seriously affect the output torque, and particularly, the problem exists when a permanent magnetic clutch is adopted. When the temperature is recovered to normal temperature, the torque is recovered to a normal value, and finally the influence of errors generated in a dynamic process on a sample result cannot be known.
3.2 Effect on failure:
since all the rotating parts are designed to be matched with the bearings, the service life of the bearings in the environment with high temperature is limited, that is, the bearings may not meet the use requirements before finally failing, and the correct output torque cannot be ensured. However, in the actual use process, the bearing can only be known to be failed if the bearing is completely damaged (is stuck or generates large vibration), and obviously, the influence of the bearing on the torque is very important to judge before the bearing is completely damaged.
3.3 solution:
the best way to monitor the change in torque is to measure it directly, but the conventional method for measuring torque must be in physical contact with the output shaft 8 of the electromagnetic clutch 7 or its associated components, and the physical contact will have to affect the output torque, and it is obvious that the direct contact measurement is not feasible. Another important innovation of the present invention is the indirect non-contact measurement method.
The measurement principle is as follows: the circumferential runout amounts of the input shaft 5 and the transmission shaft 8 are measured through the first laser displacement sensor and the second laser displacement sensor for monitoring.
For further explanation: when the bearings are heated or fail, they collectively exhibit a change in the fit clearance at the mechanical fit, which tends to cause a change in the amount of circular run-out of the shaft during rotation. Therefore, the accuracy of the output torque can be judged by detecting that the jumping amount in the rotation process of the relevant shaft is within a certain allowable error range. The utility model discloses in, set up laser displacement sensor on transmission shaft 11 and electromagnetic clutch 7's input shaft 5 respectively, carried out the displacement measurement of high accuracy (the resolution precision is 0.01 mm). This requires that the input shaft 5 and the transmission shaft 10 of the electromagnetic clutch 7 themselves have a very small amount of circular run-out and surface smoothness, and the measured displacement is obtained in real time or in stages by the first and second laser displacement sensors during the rotation of the shafts, and after the data is processed by the control system, a prompt is given if the deviation exceeds a preset value. Meanwhile, a bearing life chart can be drawn according to the data condition so as to judge the progressive failure trend and provide effective judgment reference for operation or maintenance personnel.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (7)
1. A mechanical direct-connected micro torque transmission mechanism for a Gieseler fluidity tester is characterized by comprising a power source unit, an electromagnetic clutch unit and a torque output unit which are sequentially arranged from top to bottom; the power source unit comprises a rotary driving device, the electromagnetic clutch unit comprises an electromagnetic clutch, an input shaft, an output shaft and a constant current source, and a power source interface of the electromagnetic clutch is connected with the constant current source; the torque output unit comprises a transmission shaft, an encoder and a sliding coupler; one end of the electromagnetic clutch is provided with an input shaft, the other end of the electromagnetic clutch is provided with an output shaft, the input shaft is connected with a rotating shaft of the rotating driving device, and the output shaft is connected with the transmission shaft; the electromagnetic clutch, the input shaft, the output shaft and the transmission shaft are all coaxially arranged with a rotating shaft of the rotary driving device; the bottom end of the transmission shaft is provided with a sliding coupling which is movably connected with the stirring paddle; one side of the input shaft is provided with a first laser displacement sensor, and one side of the transmission shaft is provided with a second laser displacement sensor; the encoder is a split encoder, and a coded disc of the encoder is arranged on the transmission shaft; the rotary driving device, the constant current source, the first laser displacement sensor, the second laser displacement sensor and the encoder are respectively connected with a control system of the Gieseler fluidity tester.
2. The mechanical direct-connected micro torque transmission mechanism for the Gieseler fluidity tester is characterized by further comprising a rack, wherein an upper layer clapboard and a lower layer clapboard are arranged in the rack and divide the rack into 3 spaces; the rotary driving device is fixed on the upper-layer partition plate, and the encoder body is arranged on a bottom plate of the rack; the first laser displacement sensor and the second laser displacement sensor are both mounted on the rack.
3. The mechanical direct-connected micro-torque transmission mechanism for the Gieseler fluidity tester as claimed in claim 1, wherein the rotation driving device is an AC motor or a DC motor.
4. The mechanical direct-connected micro torque transmission mechanism for the Gieseler fluidity tester is characterized in that the rotation driving device is an alternating current servo motor or a direct current servo motor, and the rotation speed adjusting range is 0-3000 r/min.
5. The mechanical direct-connected micro torque transmission mechanism for the Gieseler fluidity tester is characterized in that the input shaft is connected with a rotating shaft of a rotary driving device through a first coupling, and the output shaft is connected with a transmission shaft through a second coupling; the first coupler and the second coupler are rigid couplers or flexible couplers.
6. The mechanical direct-coupled micro torque transmission mechanism for the Gieseler fluidity tester as claimed in claim 1, wherein the electromagnetic clutch is replaced by a permanent magnet clutch.
7. The mechanical direct-connected micro torque transmission mechanism for the Gieseler fluidity tester as claimed in claim 1, wherein the constant current source is a high precision digital constant current source and has a temperature compensation function.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020324700.7U CN212111022U (en) | 2020-03-16 | 2020-03-16 | Mechanical direct-connected micro-torque transmission mechanism for Gieseler fluidity tester |
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| CN202020324700.7U CN212111022U (en) | 2020-03-16 | 2020-03-16 | Mechanical direct-connected micro-torque transmission mechanism for Gieseler fluidity tester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111220504A (en) * | 2020-03-16 | 2020-06-02 | 鞍山星源达科技有限公司 | Mechanical direct-connected micro-torque transmission mechanism for Gieseler fluidity tester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111220504A (en) * | 2020-03-16 | 2020-06-02 | 鞍山星源达科技有限公司 | Mechanical direct-connected micro-torque transmission mechanism for Gieseler fluidity tester |
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