CN213364552U - Reciprocating type rotating connection structure friction coefficient measuring device - Google Patents
Reciprocating type rotating connection structure friction coefficient measuring device Download PDFInfo
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- CN213364552U CN213364552U CN202022248513.8U CN202022248513U CN213364552U CN 213364552 U CN213364552 U CN 213364552U CN 202022248513 U CN202022248513 U CN 202022248513U CN 213364552 U CN213364552 U CN 213364552U
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Abstract
A friction coefficient measuring device of a reciprocating type rotary connection structure belongs to the technical field of simulation testing machines. The device comprises a loading assembly, a fixed loading assembly and a power driving assembly. The loading assembly compresses a spring on the spring guide rod through a nut, a second connecting plate and a lead screw, and extrudes a stress application sleeve on the first connecting plate to the spoke type weighing sensor to realize loading on the connecting rod and the pin shaft; a connecting fork, a first bracket, a second bracket, a fixed connecting rod and a pin shaft are arranged in the fixed clamping assembly; the power driving component drives the eccentric wheel to drive the connecting rod to move in a plane through the motor, so that reciprocating rotation motion of the connecting rod and the shaft sleeve is realized; the spoke type weighing sensor and the S-shaped tension sensor realize measurement of positive pressure and friction force of the reciprocating type rotary connection structure, and further calculate friction coefficients of the reciprocating type rotary connection structure. The measuring device can adjust parameters such as load size, rotation frequency and the like, simulate the service state of the reciprocating type rotating structure of the multi-working-condition marine nuclear power platform and accurately reflect the change rule of the friction coefficient of the reciprocating type rotating structure.
Description
Technical Field
The invention relates to a friction coefficient measuring device of a reciprocating type rotary connection structure, and belongs to the technical field of simulation testing machines.
Background
The reciprocating type rotary connection structure is a joint of the positioning system of the marine nuclear power platform, and can release the rotational freedom degree of the positioning system, so that the marine nuclear power platform has a good wind vane effect, and the marine nuclear power platform can be positioned on water in a certain fixed area. However, due to the complex and severe marine environment, the reciprocating rotary connection structure generates high-frequency and low-amplitude swinging, and the alternating stress caused by the swinging is circulated for a long time, so that the fatigue damage of the contact surface of the connection structure is caused. The failure of the connecting structure usually means the loss of the function of a mechanical system of the whole positioning system, so that the positioning failure of the marine nuclear power platform is caused, and huge economic loss is caused, so that the friction damage inside the reciprocating type rotary connecting structure is always a key point of attention.
The change of the friction coefficient of the connecting structure can indirectly reflect the damage condition of the internal contact surface of the connecting structure, and in order to analyze and calculate the damage degree of the connecting structure, the change rule of the friction coefficient of the connecting structure under different working conditions is necessarily simulated by a friction coefficient measuring device. At present, a friction coefficient measuring device in the market of China basically adopts a single friction coefficient test form, namely, the single friction coefficient of a test material and a friction medium is measured; meanwhile, the friction coefficient measuring device adopts a loading form of unidirectional rotation, and cannot reflect the motion form and the stress state of the connecting structure of the marine nuclear power platform, so that the test result has larger deviation from the actual condition.
Disclosure of Invention
The invention aims to provide a friction coefficient measuring device of a reciprocating type rotary connection structure, in particular to an experimental device which can be used for testing indexes of different loads, different rotation frequencies, different swing angles and the like of the reciprocating type rotary structure, aiming at the problem that the conventional friction testing machine cannot accurately measure the friction coefficient of a test piece of the reciprocating type rotary connection structure of an ocean nuclear power platform. The friction coefficient change rule of the reciprocating type rotary connection structure of the marine nuclear power platform can be simulated, and accurate and reliable data are provided for friction damage analysis.
The invention adopts the following technical scheme: a friction coefficient measuring device of a reciprocating type rotation connecting structure comprises a workbench, and the device comprises a power driving component, a fixed holding component and a loading component, wherein a motor in the power driving control component is arranged on the workbench, the motor drives an eccentric wheel, the eccentric wheel is hinged with one end of a connecting rod through an eccentric pin shaft, and the other end of the connecting rod is hinged with a connecting fork through a pin shaft;
a first bracket in the fixed holding assembly is fixed above the connecting fork, a second bracket is sleeved and fixed at the end part of a pin shaft penetrating through the connecting fork, one end of the S-shaped tension sensor is connected with the first bracket through a bolt, and the other end of the S-shaped tension sensor is connected with the second bracket through a bolt;
in the loading assembly, a vertical frame fixed on a workbench is fixedly connected with a spoke type weighing sensor, a lead screw penetrates through the spoke type weighing sensor and one end of the vertical frame and is fixedly connected with a connecting fork, two spring guide rods fixed on the vertical frame are symmetrically arranged on two sides of the other end of the lead screw, a first connecting plate and a second connecting plate are arranged on the lead screw and the spring guide rods, a spring is sleeved on the spring guide rods, one end of the spring acts on the first connecting plate, and the other end of the spring acts on the second connecting plate; the spring guide rod is matched with a first guide rod sliding sleeve on the first connecting plate, and the spring guide rod is matched with a second guide rod sliding sleeve on the second connecting plate; a stress application sleeve is arranged at the joint of the screw rod and the first connecting plate and acts on the spoke type weighing sensor; the lead screw passes the outside of second connecting plate and sets up the screw.
The spoke type weighing sensor is a strain type pressure sensor, the S-shaped tension sensor is a strain type tension sensor, and the spoke type weighing sensor and the S-shaped tension sensor are electrically connected to an external collection device.
The invention has the beneficial effects that: the device also comprises a loading component, a fixed loading component, a power driving component and the like. The loading assembly compresses a spring on the spring guide rod through a nut, a second connecting plate and a lead screw, and extrudes a stress application sleeve on the first connecting plate to the spoke type weighing sensor to realize loading on the connecting rod and the pin shaft; the fixed clamping assembly connecting fork, the first bracket and the second bracket fix the connecting rod to be tested and the pin shaft; the power driving component drives the eccentric wheel to drive the connecting rod to move in a plane through the motor, so that reciprocating rotation motion of the connecting rod and the shaft sleeve is realized; the spoke type weighing sensor and the S-shaped tension sensor are used for measuring the positive pressure and the friction force of the reciprocating type rotary connection structure and further calculating the friction coefficient of the reciprocating type rotary connection structure. The measuring device can adjust parameters such as load size, rotation frequency and the like, simulate the service state of the reciprocating type rotating structure of the multi-working-condition marine nuclear power platform and accurately reflect the change rule of the friction coefficient of the reciprocating type rotating structure.
The device adopts a fixed clamping assembly to realize fixed assembly of a pair of pin shafts, connecting rods, a tension sensor and the like, utilizes a spring loading assembly to apply positive pressure, and simultaneously adopts a power driving assembly to realize a reciprocating rotation motion mode. The device can realize the multi-working-condition simulation of the connecting structure by adjusting the spring ballast stroke and the rotating speed of the eccentric wheel; the assembly and disassembly operation of the pin shaft and the connecting rod is simple and convenient, the processing and transformation of the size and the shape can be carried out according to the clamping assembly, and the expansibility of the experimental device is enhanced. The device can effectively simulate the change rule of the friction coefficient of the reciprocating type rotating structure of the marine nuclear power platform, and provides real and reliable experimental data for friction research and damage analysis. The device can be built in an indoor laboratory, and a plurality of groups of repeated simulation experiments are carried out, so that the time and the economic cost are saved.
Drawings
FIG. 1 is a front view of a friction coefficient measuring device of a reciprocating rotary connection structure.
FIG. 2 is a structural top view of a friction coefficient measuring device of a reciprocating rotary connection structure.
Fig. 3 is a view from direction a in fig. 2.
In the figure: 1. the device comprises a workbench, 2, a motor, 2a, an eccentric wheel, 2b, an eccentric pin shaft, 3, a connecting rod, 3a, a pin shaft, 3b, a connecting fork, 4, a vertical frame, 5, an S-shaped tension sensor, 5a, a first support, 5b, a second support, 6, a spoke-type weighing sensor, 6a, a stress application sleeve, 7, a lead screw, 7a, a screw nut, 8, a first connecting plate, 8a, a second connecting plate, 8b, a first guide rod sliding sleeve, 8c, a second guide rod sliding sleeve, 9, a spring guide rod, 9a and a spring.
The specific implementation mode is as follows:
the invention is described in detail below with reference to the figures and examples.
Fig. 1, 2 and 3 show the structure of a friction coefficient measuring device of a reciprocating rotary connection structure. In the figure, the friction coefficient measuring device comprises a workbench 1 main body, wherein a stand 4 and a motor 2 are respectively fixed on the workbench 1 and are used as the main parts of the positioning and assembling of the device; the lead screw 7 penetrates through the through holes of the spoke type weighing sensor 6 and the vertical frame 4 and is fixedly connected with the connecting fork 3 b. The spring guide rod 9 is fixed on the vertical frame 4, the spring 9a is assembled between the first connecting plate 8 and the second connecting plate 8a, and the spring guide rod 9 is sleeved in series; the spring guide 9 is engaged with the first guide sliding bush 8b of the first link plate 8, and the spring guide 9 is engaged with the second guide sliding bush 8c of the second link plate 8 a. The screw nut 7a is in threaded fit with the screw rod 7 and is tightly attached to the second connecting plate 8 a; a stress application sleeve 6a is sleeved on a lead screw 7 between the first connecting plate 8 and the spoke type weighing sensor 6, and the transmission and measurement of the loading force are realized by extruding and contacting the spoke type weighing sensor 6; one end of a connecting rod 3 is hinged with a connecting fork 3b through a pin shaft 3a, the other end of the connecting rod is hinged with an eccentric wheel 2a through an eccentric pin shaft 2b, a first support 5a and a second support 5b are respectively fixed on the connecting fork 3b and the pin shaft 3a, and an S-shaped tension sensor is in bolt connection with the first support 5a and the second support 5 b; the eccentric wheel 2a is fixed on the rotating shaft of the motor 2.
The nut 7a is provided with three holes along the radial direction, and can be inserted into the round hole through an iron rod to rotate to apply torque, so that the spring 9a is extruded to realize loading.
The spoke type weighing sensor 6 measures the pressure of the stress application sleeve 6a, the pressure is equivalent to the pulling force applied to the lead screw 7, the lead screw 7 and the connecting fork 3b are fixedly connected as a whole, meanwhile, the pin shaft 3a is hinged with the connecting rod 3 and is fixed on the connecting fork 3b, and under the low-speed quasi-static condition, the measured pulling force is the positive pressure between the pin shaft 3a and the connecting rod 3. The S-shaped tension sensor 5 measures tension at the upper end of the second support 5b, a main structure body of the second support 5b is radial along the pin shaft 3a and is vertical to a main structure of the S-shaped tension sensor 5, and through the moment balance relation of the pin shaft 3a, tension data of the S-shaped tension sensor 5 can be calculated according to the length of the second support 5b and the radius of the pin shaft 3a to obtain friction force between the pin shaft 3a and the connecting rod 3.
The measuring device adopts the following experimental steps when in use:
the first step, external computer acquisition equipment, the sensor of connecting this measuring device contains spoke formula weighing sensor 6 and S type tension sensor 5, sets up collection channel, collection frequency etc. then the balanced zero clearing.
And secondly, adjusting the position of a screw nut 7a on the screw rod 7, releasing the assembly stress of the structure, loading the stroke of a compression spring 9a, and observing the data of a channel where the spoke type weighing sensor 6 is located until the data is loaded to an experimental preset initial value and then stopping.
And thirdly, setting the rotating speed and the experimental time of the motor 2 through an externally connected computer for controlling the driving of the turntable.
And fourthly, supplying power to start up, and observing the data change collected by the sensor.
Fifthly, the power driving component realizes the reciprocating rotation motion of the pin shaft 3a and the connecting rod 3.
And sixthly, storing the experimental data, stopping the motor 2, and closing the measuring device and the signal acquisition equipment.
By adopting the technical scheme, the spoke type weighing sensor and the S-shaped tension sensor have the principle that the elastic sensitive element and the strain gauge are utilized to convert the measured tension pressure into corresponding resistance value change, and the integrated display and storage of the measured data can be completed through the external acquisition equipment.
The fixed subassembly that holds that adds realizes the assembly of round pin axle and connecting rod through the yoke and hold with adding, round pin axle and connecting rod be the reciprocating type rotational friction pair that awaits measuring, can design the size and the shape of processing junction according to the experiment demand. The power driving assembly drives the eccentric wheel to conduct through a motor installed on the workbench, the eccentric position of the eccentric wheel is hinged with one end of the connecting rod through an eccentric pin shaft, so that the plane reciprocating motion of the connecting rod and the pin shaft is controlled, and the lead screw connected with the connecting fork bolt linearly moves along a round hole of the vertical frame. The device comprises a spoke type weighing sensor arranged on a stand and an S-shaped tension sensor arranged between a first support and a second support of a fixed holding assembly, and is used for measuring the positive pressure and the friction force of a pin shaft and a connecting rod in reciprocating rotary motion.
According to the technical scheme, the spring on the compression spring guide rod is used as the loading device, the alternating load of the connecting structure is applied, meanwhile, the motor is used for driving the eccentric wheel to drive the connecting rod to realize reciprocating type rotating motion, test data are collected through the spoke type weighing sensor fixed on the stand and the S-shaped tension sensor additionally arranged on the first support and the second support, and then the friction coefficient of the reciprocating type rotating connecting structure is obtained through calculation.
Claims (2)
1. The utility model provides a reciprocating type swivelling joint structure coefficient of friction measuring device, it includes workstation (1), its characterized in that: the device comprises a power driving component, a fixed clamping component and a loading component, wherein a motor (2) in the power driving control component is arranged on a workbench (1), the motor (2) drives an eccentric wheel (2 a), the eccentric wheel (2 a) is hinged with one end of a connecting rod (3) through an eccentric pin shaft (2 b), and the other end of the connecting rod (3) is hinged with a connecting fork (3 b) through a pin shaft (3 a);
a first support (5 a) in the fixed holding assembly is fixed above a connecting fork (3 b), a second support (5 b) is fixedly sleeved at the end part of a pin shaft (3 a) penetrating through the connecting fork (3 b), one end of an S-shaped tension sensor (5) is in bolt connection with the first support (5 a), and the other end of the S-shaped tension sensor (5) is in bolt connection with the second support (5 b);
in the loading assembly, a vertical frame (4) fixed on a workbench (1) is fixedly connected with a spoke type weighing sensor (6), a lead screw (7) penetrates through the spoke type weighing sensor (6) and one end of the vertical frame (4) to be fixedly connected with a connecting fork (3 b), two spring guide rods (9) fixed on the vertical frame (4) are symmetrically arranged on two sides of the other end of the lead screw (7), a first connecting plate (8) and a second connecting plate (8 a) are arranged on the lead screw (7) and the spring guide rods (9), a spring (9 a) is sleeved on each spring guide rod (9), one end of each spring (9 a) acts on the first connecting plate (8), and the other end of each spring (9 a) acts on the second connecting plate (8 a); the spring guide rod (9) is matched with a first guide rod sliding sleeve (8 b) on the first connecting plate (8), and the spring guide rod (9) is matched with a second guide rod sliding sleeve (8 c) on the second connecting plate (8 a); a stress application sleeve (6 a) is arranged at the joint of the screw rod (7) and the first connecting plate (8), and the stress application sleeve (6 a) acts on the spoke type weighing sensor (6); the screw rod (7) penetrates through the outer side of the second connecting plate (8 a) to be provided with a nut (7 a).
2. A reciprocating rotary joint structure friction coefficient measuring device as defined in claim 1, wherein: spoke formula weighing sensor (6) are strain gauge pressure sensor, and S type force sensor (5) are strain gauge force sensor, and spoke formula weighing sensor (6) and S type force sensor (5) electricity are connected to external collection equipment.
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| CN202022248513.8U CN213364552U (en) | 2020-10-12 | 2020-10-12 | Reciprocating type rotating connection structure friction coefficient measuring device |
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| CN202022248513.8U CN213364552U (en) | 2020-10-12 | 2020-10-12 | Reciprocating type rotating connection structure friction coefficient measuring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112198111A (en) * | 2020-10-12 | 2021-01-08 | 大连理工大学 | Reciprocating type rotating connection structure friction coefficient measuring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112198111A (en) * | 2020-10-12 | 2021-01-08 | 大连理工大学 | Reciprocating type rotating connection structure friction coefficient measuring device |
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