阅读说明：本技术 一种测试弹性卷筒热变形的系统及方法 (System and method for testing thermal deformation of elastic winding drum ) 是由 樊俊峰 韩静涛 黎彪 马晓燕 张从发 蔡铮 张军 刘志全 孟庆平 丁健 罗婕 于 2021-01-08 设计创作，主要内容包括：本发明提供了一种测试弹性卷筒机构热变形的系统及方法,属于航天器机构技术领域。所述系统用于对卷筒式伸杆机构进行测试,将卷筒式伸杆机构中的弹性卷筒作为待测卷筒；所述系统包括：参考卷筒、加热机构、测位机构、测控温机构；所述参考卷筒与待测卷筒是完全相同的弹性卷筒；所述参考卷筒保持展开状态；所述参考卷筒与卷筒式伸杆机构均设置在所述加热机构内,且所述参考卷筒与所述待测卷筒对称设置；所述测位机构设置在所述加热机构的外部；所述测控温机构包括温度传感器和温度控制装置；所述温度传感器设置在所述参考卷筒上。利用本发明不影响待测卷筒的展开和展开精度,具有测量精度高的优点,且搭建简单、实施快捷高效、成本低廉的优势。(The invention provides a system and a method for testing thermal deformation of an elastic winding drum mechanism, and belongs to the technical field of spacecraft mechanisms. The system is used for testing the winding drum type stretching rod mechanism, and an elastic winding drum in the winding drum type stretching rod mechanism is used as a winding drum to be tested; the system comprises: the device comprises a reference winding drum, a heating mechanism, a position measuring mechanism and a temperature measuring and controlling mechanism; the reference winding drum and the winding drum to be measured are completely the same elastic winding drum; the reference reel remains unwound; the reference winding drum and the winding drum type stretching rod mechanism are both arranged in the heating mechanism, and the reference winding drum and the winding drum to be measured are symmetrically arranged; the positioning mechanism is arranged outside the heating mechanism; the temperature measurement and control mechanism comprises a temperature sensor and a temperature control device; the temperature sensor is arranged on the reference winding drum. The invention has the advantages of no influence on the unfolding and unfolding precision of the drum to be measured, high measurement precision, simple construction, quick and efficient implementation and low cost.)

1. A system for testing the thermal deformation of an elastic reel mechanism is used for testing a reel type extension rod mechanism, and an elastic reel in the reel type extension rod mechanism is used as a reel to be tested; the method is characterized in that: the system comprises: the device comprises a reference winding drum, a heating mechanism, a position measuring mechanism and a temperature measuring and controlling mechanism;

the reference winding drum and the winding drum to be measured are completely the same elastic winding drum; the reference reel remains unwound;

the reference winding drum and the winding drum type stretching rod mechanism are both arranged in the heating mechanism, and the reference winding drum and the winding drum to be measured are symmetrically arranged;

the positioning mechanism is arranged outside the heating mechanism;

the temperature measurement and control mechanism comprises a temperature sensor and a temperature control device; the temperature sensor is arranged on the reference winding drum.

2. The system for testing thermal deformation of an elastic reel mechanism according to claim 1, wherein: a plurality of temperature sensors are arranged at different heights on the reference winding drum;

two temperature sensors which are uniformly distributed on the circumference are arranged at the same height;

the temperature sensors on two adjacent levels are circumferentially spaced apart by 90 °.

3. The system for testing thermal deformation of an elastic reel mechanism according to claim 2, wherein: the heating mechanism comprises a plurality of groups of heating devices;

each set of heating devices comprises: the device comprises a frame vehicle, a lamp array frame and a lamp array;

the lamp array frame is arranged on the frame vehicle and can move up and down on the frame vehicle;

the lamp array is arranged on the lamp array frame;

the lamp array comprises a plurality of infrared lamp tubes and a heat-insulating lamp shade;

the heat-insulating lampshade is arranged on the lamp array frame; the heat-insulating lampshade is positioned between the infrared lamp tube and the lamp array frame.

4. A system for testing the thermal deformation of an elastic reel mechanism according to claim 3, wherein: the heating mechanism comprises four groups of heating devices, namely a left heating device, a right heating device, a front heating device and a rear heating device;

four groups of heating devices are uniformly distributed on the circumference, namely the center point of the projection of the lamp array of each group of heating devices on the ground is positioned on the same circle, the center of the circle is used as the center of the heating mechanism, and the area in the circle is a heating area.

5. The system for testing thermal deformation of an elastic reel mechanism according to claim 4, wherein: the reference winding drum and the winding drum type stretching rod mechanism are arranged in the heating area;

the central axes of the reference winding drum and the winding drum to be tested are vertical to the ground, and a connecting line of the projection of the central axis of the reference winding drum on the ground and the projection of the central axis of the winding drum to be tested on the ground forms an included angle of 45 degrees with a connecting line of the central point of the left heating device and the central point of the right heating device, and also forms an included angle of 45 degrees with a connecting line of the central points of the front heating device and the rear heating device;

the distance between the projection of the central axis of the reference winding drum on the ground and the projection of the central axis of the winding drum to be measured on the ground to the center of the heating mechanism is the same, and the connecting line of the reference winding drum and the heating mechanism penetrates through the center of the heating mechanism.

6. The system for testing thermal deformation of an elastic reel mechanism according to claim 5, wherein: the position finding mechanism comprises three theodolites, and the three theodolites are all arranged outside the heating mechanism;

the first theodolite and the second theodolite are respectively positioned on a Z axis and a Y axis of a coordinate system, and the third theodolite is arranged between the first theodolite and the second theodolite and forms an included angle of 60 degrees with the first theodolite.

7. The system for testing thermal deformation of an elastic reel mechanism according to claim 6, wherein: a precise measurement target point and a measurement mirror are arranged on the drum type extension rod mechanism;

the measuring mirror is arranged at the bottom of the winding drum type rod extending mechanism;

the precision measurement target point comprises a top end target and a middle target;

the top end target adopts a spherical target ball and is arranged at the top end of the winding drum to be detected;

the middle target is arranged on the lower auxiliary supporting cylindrical surface of the drum type extension rod mechanism and comprises a plurality of paper targets which are uniformly distributed on the circumference, and the center of the circle is used as the central point of the middle target.

8. The system for testing thermal deformation of an elastic reel mechanism according to claim 7, wherein: the system comprises two independent platforms;

two of the platforms are disposed within the heating zone;

two the platform is installed subaerial, all is provided with the installation base on every platform for fixed reference reel and reel formula stretcher mechanism.

9. The system for testing thermal deformation of an elastic reel mechanism according to claim 8, wherein: a baffle is arranged between the heating mechanism and the position measuring mechanism;

and the bottom of the frame vehicle is provided with a lockable roller.

10. A system for testing thermal deformation of an elastic winding drum mechanism is characterized in that: the method comprises the following steps:

(1) installing a system for testing the thermal deformation of an elastic reel mechanism according to any one of claims 1 to 9;

(2) measuring pointing accuracy:

(21) measuring coordinates of a central point of the middle target and a central point of the top target in a measuring mirror coordinate system by using a position measuring mechanism to obtain pointing accuracy of the drum to be measured in the measuring mirror coordinate system, and then obtaining pointing accuracy of the drum to be measured in a reference coordinate system through conversion of the measuring mirror coordinate system and the reference coordinate system; the pointing accuracy refers to an included angle between a connecting line of a central point of the middle target and a central point of the top target and an X axis in a coordinate system;

(22) respectively testing the pointing accuracy under different working conditions:

the heating mechanism is controlled by the temperature control device to heat the heating area, so that the heating area is at different temperatures; the different working conditions refer to different temperatures of the heating area;

and (3) unwinding the drum to be detected for N times under each working condition, obtaining the pointing accuracy according to the step (21) each time, and taking the average value of the N pointing accuracies as the pointing accuracy under the working condition.

Technical Field

The invention belongs to the technical field of spacecraft mechanisms, and particularly relates to a system and a method for testing thermal deformation of an elastic winding drum.

Background

The reel type extension rod mechanism is a one-dimensional unfolding mechanism, the mechanism adopts a mechanical and electrical integration design, the requirements of large storage ratio and large unfolding length are met, the unfolding length can reach 5 m-10 m, and the unfolding length is mainly realized by releasing an elastic reel. The thermal deformation is an important index influencing the pointing accuracy of the mechanism, so that theoretical analysis and experimental verification need to be carried out on the thermal deformation of the elastic winding drum, but the thermal deformation cannot be theoretically and quantitatively analyzed at present, and therefore, the development of experimental measurement of the thermal deformation of the elastic winding drum is particularly important.

Chinese patent publication CN201210438969.8 discloses a heating method in which an infrared lamp array is disposed outside a test product, and a heat-insulating lampshade is disposed on a side of the infrared lamp array opposite to the test product, and heat is transferred to the test product by diffusion. Chinese patent publication CN201610616556.2 discloses a method for indirectly measuring the temperature of an antenna by arranging a thermocouple on the antenna and calibrating the emissivity of the antenna by testing the surface temperature with a thermal imager. However, these two temperature measurement and control methods are only effective for stationary products and are not suitable for moving mechanisms. This is because the thermocouple is connected by a cable, and if the thermocouple is directly attached to the mechanism to be measured, the expansion and contraction of the thermocouple can be affected. And if the thermocouple is directly pasted on the elastic winding drum, the glue used for pasting can cause certain pollution to the surface of the product.

Considering that the reel-type boom mechanism works in a space environment, it is most desirable to measure thermal deformation in vacuum so as to reduce the influence of air disturbance on measurement, and a vacuum simulation device commonly used at present is a vacuum tank. However, in order to maintain the vacuum degree of the vacuum tank, the vacuum pump needs to work continuously, vibration of the vacuum pump can be transmitted to a tested product in the tank through the tank body, so that the reliability of the test is influenced, in addition, the temperature rise and the temperature fall in the vacuum tank are slow, the measurement is more difficult, and therefore the test in the vacuum tank is more disadvantageous and is not a preferable test scheme.

In order to solve the problems of temperature measurement and precision measurement of a movement mechanism, a new thermal deformation measurement system and method need to be provided.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a system and a method for testing the thermal deformation of an elastic winding drum at normal temperature and normal pressure, which can realize temperature measurement and control of a movement mechanism, and have the advantages of stable temperature field, one-time sticking of a temperature measurement point and no mutual influence on the movement of the mechanism.

The invention is realized by the following technical scheme:

in a first aspect of the present invention, a system for testing thermal deformation of an elastic reel is provided, where the system is used to test a reel-type boom mechanism, and the elastic reel in the reel-type boom mechanism is used as a reel to be tested; the system comprises: the device comprises a reference winding drum, a heating mechanism, a position measuring mechanism and a temperature measuring and controlling mechanism;

the reference winding drum and the winding drum to be measured are completely the same elastic winding drum; the reference reel remains unwound;

the reference winding drum and the winding drum type stretching rod mechanism are both arranged in the heating mechanism, and the reference winding drum and the winding drum to be measured are symmetrically arranged;

the positioning mechanism is arranged outside the heating mechanism;

the temperature measurement and control mechanism comprises a temperature sensor and a temperature control device; the temperature sensor is arranged on the reference winding drum.

A further development of the invention consists in that a plurality of temperature sensors are provided at different heights on the reference drum;

two temperature sensors which are uniformly distributed on the circumference are arranged at the same height;

the temperature sensors on two adjacent levels are circumferentially spaced apart by 90 °.

A further development of the invention is that the heating mechanism comprises a plurality of groups of heating devices;

each set of heating devices comprises: the device comprises a frame vehicle, a lamp array frame and a lamp array;

the lamp array frame is arranged on the frame vehicle and can move up and down on the frame vehicle;

the lamp array is arranged on the lamp array frame;

the lamp array comprises a plurality of infrared lamp tubes and a heat-insulating lamp shade;

the heat-insulating lampshade is arranged on the lamp array frame; the heat-insulating lampshade is positioned between the infrared lamp tube and the lamp array frame.

The invention is further improved in that the heating mechanism comprises four groups of heating devices, namely a left heating device, a right heating device, a front heating device and a rear heating device;

four groups of heating devices are uniformly distributed on the circumference, namely the center point of the projection of the lamp array of each group of heating devices on the ground is positioned on the same circle, the center of the circle is used as the center of the heating mechanism, and the area in the circle is a heating area.

The invention further improves that the reference reel and the reel type boom mechanism are arranged in the heating area;

the central axes of the reference winding drum and the winding drum to be tested are vertical to the ground, and a connecting line of the projection of the central axis of the reference winding drum on the ground and the projection of the central axis of the winding drum to be tested on the ground forms an included angle of 45 degrees with a connecting line of the central point of the left heating device and the central point of the right heating device, and also forms an included angle of 45 degrees with a connecting line of the central points of the front heating device and the rear heating device;

the distance between the projection of the central axis of the reference winding drum on the ground and the projection of the central axis of the winding drum to be measured on the ground to the center of the heating mechanism is the same, and the connecting line of the reference winding drum and the heating mechanism penetrates through the center of the heating mechanism.

The invention is further improved in that the position finding mechanism comprises three theodolites which are arranged outside the heating mechanism;

the first theodolite and the second theodolite are respectively positioned on a Z axis and a Y axis of a coordinate system, and the third theodolite is arranged between the first theodolite and the second theodolite and forms an included angle of 60 degrees with the first theodolite.

The invention has the further improvement that a precise measurement target point and a measurement mirror are arranged on the winding drum type extension rod mechanism;

the measuring mirror is arranged at the bottom of the winding drum type rod extending mechanism;

the precision measurement target point comprises a top end target and a middle target;

the top end target adopts a spherical target ball and is arranged at the top end of the winding drum to be detected;

the middle target is arranged on the lower auxiliary supporting cylindrical surface of the drum type extension rod mechanism and comprises a plurality of paper targets which are uniformly distributed on the circumference, and the center of the circle is used as the central point of the middle target.

A further development of the invention is that the system comprises two independent platforms;

two of the platforms are disposed within the heating zone;

two the platforms are installed on the ground, and each platform is provided with an installation base for fixing a reference reel and a reel type extension rod mechanism

In a further improvement of the present invention, a barrier is provided between the heating means and the position measuring means;

and the bottom of the frame vehicle is provided with a lockable roller.

In a second aspect of the present invention, there is provided a method of testing the thermal deformation of an elastic reel mechanism, the method comprising:

(1) system for testing thermal deformation of elastic winding drum mechanism with installed elastic winding drum

(2) Measuring pointing accuracy:

(21) measuring coordinates of a central point of the middle target and a central point of the top target in a measuring mirror coordinate system by using a position measuring mechanism to obtain pointing accuracy of the drum to be measured in the measuring mirror coordinate system, and then obtaining pointing accuracy of the drum to be measured in a reference coordinate system through conversion of the measuring mirror coordinate system and the reference coordinate system; the pointing accuracy refers to an included angle between a connecting line of a central point of the middle target and a central point of the top target and an X axis in a coordinate system;

(22) respectively testing the pointing accuracy under different working conditions:

the heating mechanism is controlled by the temperature control device to heat the heating area, so that the heating area is at different temperatures; the different working conditions refer to different temperatures of the heating area;

and (3) unwinding the drum to be detected for N times under each working condition, obtaining the pointing accuracy according to the step (21) each time, and taking the average value of the N pointing accuracies as the pointing accuracy under the working condition.

Compared with the prior art, the invention has the beneficial effects that:

(1) the thermocouple is arranged on the reference winding drum instead of the thermocouple arranged on the winding drum to be tested, the thermocouple on the reference winding drum is used for testing the environmental temperature field, the temperature of the symmetrically placed winding drum to be tested is represented by the same temperature field in the same area, and the unfolding and unfolding precision of the winding drum to be tested is not influenced;

(2) the theodolite is adopted for non-contact precision measurement, the disturbance to a drum to be measured is not introduced in the measurement, and the method has the advantage of high measurement precision;

(3) the invention uses the lamp array system to realize heating, has the advantage of not contacting with the heated object, installs the heat-insulating lamp shade behind the lamp array, and installs the enclosure outside the lamp array system, thus improving the stability of the temperature field and the temperature control precision;

(4) the method is carried out at normal temperature and normal pressure, and has the advantages of simple system construction, quick and efficient implementation and low cost compared with the method in a vacuum tank.

Drawings

FIG. 1 is a schematic structural diagram of an elastic reel in a reel-type boom mechanism tested by the system for testing thermal deformation of an elastic reel according to the present invention;

FIG. 2 is a layout diagram of temperature measurement and control points in the system for testing thermal deformation of an elastic winding drum according to the present invention;

FIG. 3 is a three-dimensional structure diagram (including arrangement of precision measurement points) of the elastic reel of the reel type stretch rod mechanism in an unfolded state, tested by the system for testing thermal deformation of an elastic reel of the present invention;

FIG. 4-1 is a schematic view of a heating apparatus in the system for testing thermal deformation of an elastic reel according to the present invention;

FIG. 4-2 is a schematic structural view of a lamp array in a lamp array system in a system for testing thermal deformation of an elastic reel according to the present invention;

FIGS. 4-3 are schematic structural views of a reference reel mounting base in the system for testing thermal deformation of an elastic reel according to the present invention;

FIG. 5 is a schematic diagram of the relative positions of a lamp array and a reel to be tested in a test system without a reference reel;

FIG. 6 is a schematic diagram showing the relative positions of the lamp array, the reel to be tested and the reference reel in the system for testing the thermal deformation of the elastic reel according to the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

the invention provides a thermal deformation testing system of a lamp array, a theodolite and a reference drum, which is used for measuring the change of pointing accuracy of a drum type extension rod mechanism in a high-temperature and low-temperature environment.

Specifically, the system for testing the thermal deformation of the elastic winding drum is used for testing the elastic winding drum in the winding drum type boom mechanism, and the elastic winding drum is used as the winding drum 2 to be tested. The system of the invention comprises: the device comprises a reference winding drum 1, a heating mechanism, a position measuring mechanism and a temperature measuring and controlling mechanism.

The reference winding drum 1 is an elastic winding drum which is completely the same as the winding drum 2 to be measured, the material, the structure and the like of the reference winding drum and the winding drum are completely the same, and the structures of the reference winding drum and the winding drum are both shown in fig. 1. In the experimental process, the reference reel is always kept in an unfolded state, namely, the reference reel is extended to the longest state, and the reel to be measured in the reel type boom mechanism can be unfolded or retracted.

As shown in fig. 6, the reference reel 1 and the reel-type boom mechanism are both disposed in the heating mechanism, and the reference reel 1 and the to-be-measured reel 2 in the reel-type boom mechanism are symmetrically disposed. The position measuring mechanism is arranged outside the heating mechanism; the temperature measurement and control mechanism comprises a temperature sensor and a temperature control device; the temperature sensor is arranged on the outer wall of the reference winding drum.

The examples of the invention are as follows:

[ EXAMPLES one ]

A plurality of temperature sensors are arranged on the reference winding drum, and preferably, the temperature sensors adopt thermocouples. As shown in fig. 2, in the present embodiment, 8 temperature sensors were provided on the reference bobbin, and there were sequentially provided, from the top end to the bottom end, a seventh thermocouple and an eighth thermocouple provided 500mm from the top end, a fifth thermocouple and a sixth thermocouple provided 1200mm from the top end, a third thermocouple and a fourth thermocouple provided 1900mm from the top end, and a first thermocouple and a second thermocouple provided 2600mm from the top end.

Two thermocouples located at the same height are symmetrically arranged, namely, the two thermocouples are separated by 180 degrees on the circumference, and the thermocouples on the two adjacent heights are separated by 90 degrees on the circumference. When the thermocouple device is actually used, the positions and the number of the thermocouples arranged on the reference winding drum can be increased or decreased according to actual needs. The thermocouple can be an existing conventional thermocouple, and the thermocouple is directly pasted on the reference winding drum.

[ example two ]

The heating mechanism includes a plurality of groups of heating devices, as shown in fig. 4-1, each group of heating devices includes: a frame cart 403, a light array frame 402, and a light array 401. The lamp array frame 402 is mounted on the frame vehicle 403, and can move up and down on the frame vehicle 403 to adjust the height, and the lamp array 401 is mounted on the lamp array frame. The bottom of the frame vehicle 403 is provided with a lockable roller (which can be a commercially available product).

Specifically, a plurality of threaded holes arranged in the longitudinal direction are formed in the upper portion of the frame vehicle 403, a plurality of threaded holes arranged in the longitudinal direction are also formed in the lamp array frame 402, bolts sequentially penetrate through the threaded holes in the lamp array frame and the frame vehicle and then are connected with nuts, the lamp array frame is fixed on the frame vehicle through the bolts, and the lamp array frame can be fixed at different heights on the frame vehicle through the threaded holes with different heights.

In this embodiment, the frame vehicle 403 includes four lower columns perpendicular to the ground, the projections of the four lower columns on the horizontal plane are four rectangular vertexes, a plurality of cross beams are arranged between two adjacent lower columns from top to bottom, the four lower columns are connected into a rectangular frame structure through the cross beams, two mounting columns parallel to the lower columns are arranged between the two lower columns, and a plurality of threaded holes are formed in each mounting column from top to bottom. The frame vehicle can be formed by welding square aluminum tubes with the cross sections of 40mmX40mm and the tube thickness of 5 mm. The bottom end of each upright post is provided with a lockable roller, so that the infrared lamp can be conveniently moved and adjusted in position and location.

The lamp array frame in this embodiment is a triangular prism frame structure, and includes three upper columns perpendicular to the ground, including first column, second column 402 and third column, three columns are projected on the horizontal plane as three vertexes of a triangle, and two adjacent columns are connected through a plurality of short beams. The first upright post and the second upright post are provided with a plurality of threaded holes from top to bottom, the distance between the two upright posts is the same as the distance between the two mounting posts on the frame vehicle, and the two upright posts are mounted on the two mounting posts on the frame vehicle through bolts. The lamp array is installed on the third stand in the lamp array frame, and the third stand provides the installation fulcrum for the lamp array, and the lamp array frame can adopt the square aluminum tube welding of 30mmX30mm pipe thickness 2.5mm to form.

Preferably, the lamp array frame 402 and the frame vehicle 403 are connected by 2 rows of M12 bolts, so that the lamp array frame can be adjusted up and down, i.e. the height of the lamp array frame can be adjusted.

[ EXAMPLE III ]

The lamp array 401 comprises a plurality of infrared lamp tubes 4011 and a plurality of heat-insulating lamp covers 4012, the infrared lamp tubes 4011 correspond to the heat-insulating lamp covers 4012 one by one, and the structure of one infrared lamp tube 4011 and one heat-insulating lamp cover 4012 is shown in fig. 4-2. Thermal-insulated lamp shade 4012 installs on the third stand in lamp battle array frame 402 infrared lamp 4011 is installed in thermal-insulated lamp shade 4012's the place ahead, promptly thermal-insulated lamp shade 4012 is located between infrared lamp 4011 and the lamp battle array frame 402, and thermal-insulated lamp shade 4012 sets up at the back of fluorescent tube like this, has guaranteed that the fluorescent tube only heats the place ahead, and can not heat the lamp battle array frame at rear, has also guaranteed that the lamp battle array frame can not warp because of rising temperature. Because the position of the lamp array is changed due to the deformation of the lamp array frame, the heating position is changed, and the test precision is influenced due to the change of the heating position, the deformation of the lamp array frame is avoided through the heat-insulating lamp cover, and the test precision is ensured. The infrared lamp tube and the heat-insulating lampshade are both existing products, and are not described again.

[ EXAMPLE IV ]

The heating mechanism comprises 4 groups of heating devices, namely a left heating device, a right heating device, a front heating device and a rear heating device, wherein the four groups of heating devices are uniformly distributed on the circumference, namely the central points of the projections of the lamp arrays of each group of heating devices on the ground are positioned on the same circle, the center of the circle is used as the center of the heating mechanism, the central points of the four projections are uniformly distributed on the circumference, and the connecting line of the central point of the left heating device and the central point of the right heating device and the connecting line of the central points of the front heating device and the rear heating device are mutually vertical. The area within the circle is the heating area.

[ EXAMPLE V ]

The reference winding drum and the tested winding drum type stretching rod mechanism are arranged in a circle surrounded by 4 groups of heating devices, the reference winding drum and the tested winding drum are arranged vertically, namely the reference winding drum and the central axis of the tested winding drum are all perpendicular to the ground, a 45-degree included angle is formed between a connecting line of the projection of the central axis of the reference winding drum on the ground and the projection of the central axis of the tested winding drum on the ground and a connecting line of the central point of the left heating device and the central point of the right heating device, a 45-degree included angle is also formed between the connecting line of the central axis of the reference winding drum on the ground and the projection of the central axis of the tested winding drum on the ground and the center of the heating mechanism, and the connecting line of the reference winding drum and the. Through the arrangement, the reference winding drum and the winding drum to be measured are located in the same temperature field and are symmetrically arranged, so that the temperature of the thermocouple on the reference winding drum can represent the temperature of the winding drum to be measured at the same position of the winding drum type boom mechanism to be measured.

Fig. 5 shows that a thermocouple is directly attached to a to-be-measured reel of the reel type boom mechanism to directly measure the to-be-measured reel, and the to-be-measured reel can only be in an unfolded state, cannot be folded, and cannot measure deformation because the thermocouple is attached. FIG. 6 is a diagram of the test system of the present invention with reference to the spool and the spool-type reach bar mechanism that can unwind and retract the spool under test. In fig. 6, the connecting line of the front and rear lamp arrays is perpendicular to the connecting line of the left and right lamp arrays, the intersection point of the two connecting lines is the center of the heating mechanism, the connecting line of the projection of the central axes of the reference winding drum and the elastic winding drum on the horizontal plane passes through the center of the heating mechanism, and the distances from the two connecting lines to the center of the heating mechanism are equal, so that the mutual shielding influence between the two winding drums is reduced, and the temperature of the two winding drums is ensured to be the same.

[ EXAMPLE six ]

The position finding mechanism includes three theodolites, and three theodolites all set up the outside of heating mechanism, it is preferred, and first theodolite is located the Z of reel formula buck mechanism and is epaxial, and the second theodolite is located the Y of reel formula buck mechanism and is epaxial, and both become 90 and arrange, and the initial point of XYZ axle is the central point of survey mirror, obtains through the cross silk of measuring survey mirror surface center, and the third theodolite is arranged between first theodolite and second theodolite, becomes about 60 with first theodolite contained angle. The first theodolite and the second theodolite are about 2m away from the center of the heating mechanism, and the third theodolite is 3-3.5m away from the center of the heating mechanism.

[ EXAMPLE VII ]

As shown in fig. 3, in order to measure the thermal deformation, a precise target point and a measuring mirror 302 are installed on the to-be-measured reel-type boom mechanism, the measuring mirror 302 is adhered to the bottom of the to-be-measured reel-type boom mechanism through epoxy glue, the adhering position is convenient for the theodolite to measure, and the measuring mirror 302 is installed at the bottom to avoid being heated by a lamp array, so that a measuring error is introduced. The measuring mirror may be an existing cube mirror.

The precise measurement target points are arranged on the drum to be measured, specifically, the precise measurement target points comprise a top end target 304 and a middle target 303, the top end target adopts a spherical target ball, the top end target is installed on the top end of the drum to be measured through threads on the top end of the drum to be measured, the middle target 303 adopts a paper target, a double faced adhesive tape is adhered on a lower auxiliary supporting cylindrical surface of the drum type extension rod mechanism, the position of the middle target 303 is unchanged and does not stretch along with the drum, and the periphery of the middle target 303 is compressed and fixed by a 3M adhesive tape. The intermediate targets 303 are uniformly arranged around the cylindrical surface, and 5-6 targets are arranged.

The height of the first theodolite and the second theodolite is limited by a measuring mirror arranged on the drum-type boom mechanism, the height is about 1.2-1.5m, and the height of the third theodolite is not limited, generally about 2 m.

The first and second theodolite online building stations are responsible for measuring a measuring mirror on the drum type stretching rod mechanism and measuring a coordinate system of the measuring mirror, the first and third online building stations are responsible for measuring a middle target 303 and a top target 304 so as to calculate a drum axis, the three theodolites are online and can calculate the positions of the middle target 303 and the top target 304 of the drum type stretching rod mechanism under the coordinate system of the measuring mirror, and drum thermal deformation data can be obtained by measuring at different temperatures. The theodolite is made of a commercially available product. The theodolites measure the angle physical quantity, and the station is built by more than two theodolites on line to mark the scale with known length, so that a three-coordinate measuring system of three-dimensional space can be built, and points and lines in the system can be measured, thereby further calculating the relation between position and angle.

[ example eight ]

The system also comprises a temperature control device, data collected by the thermocouples are sent to the temperature control device, the temperature control device controls each infrared lamp tube in a mode of combining closed-loop automatic control and manual current limiting, the current value of each infrared lamp tube under each working condition is adjusted in real time according to the fluctuation condition of the temperature collected by the corresponding thermocouple, and the system has the functions of storage, display, printing and timely drawing, has the capabilities of alarming, protection and interference resistance, the temperature control device adopts the existing equipment, and the control method is also the existing mature technology and is not repeated herein.

[ EXAMPLE ninth ]

Further, the system comprises two independent platforms which are respectively used for supporting the reference winding drum and the mechanism to be tested. Two of the platforms are disposed within the heating zone, and the heating device is disposed about both platforms. The two platforms are arranged on the ground, in order to install the reel type boom extension mechanism and the reference reel on the platforms, each platform is provided with an installation base, the reference reel is fixed on a special reference reel installation base, the base is in a cylindrical structure as shown in figures 4-3, a central through hole is formed in the cylindrical structure, and the lower end of the base is connected with the platforms into a whole. The reference winding drum installation base is made of steel materials, a glass fiber reinforced plastic pad is additionally arranged between the base and the reference winding drum for insulation, and for example, glass fiber reinforced plastic cloth can be cut and wrapped between the winding drum and the base to form insulation between the winding drum and the base.

Reel formula is stretched pole mechanism and is fixed on the reel installation base that awaits measuring, and the reel installation base that awaits measuring is formed by the section bar welding, and its bottom is connected with the platform, installs aluminum plate on the reel installation base that awaits measuring, for reel formula is stretched pole mechanism and is provided the installation interface, and reel formula is stretched pole mechanism and can be installed on the base through flange 301 to the central axis that guarantees the reel that awaits measuring can with perpendicular to the ground.

[ EXAMPLE eleven ]

Further, in order to prevent the air current from causing the vibration of the reference winding drum and the winding drum to be detected, the periphery of the heating mechanism is provided with an enclosure which is arranged close to the heating mechanism, and the enclosure is positioned between the theodolite and the heating mechanism. When the enclosure is arranged, the connecting line of the middle target 303, the top target B and the theodolite is exposed, so that the theodolite can conveniently measure. The purpose of using the enclosure is to reduce the influence on the test precision due to the fact that large air flows are formed due to uneven temperature of the test site.

Temperature control is difficult given the large temperature difference between the heated area and the surrounding ambient atmosphere, and hence instability at the thermal boundary of the overall system. When the system is designed, on the premise of meeting the requirement of uniformity of a temperature field of a heating area, the circle surrounded by the heating device is required to be as small as possible, and meanwhile, the surrounding block is closed to ensure that the surrounding space has good barrier property, so that the heating area is isolated from the surrounding space, the temperature control is facilitated, and the testing efficiency and the testing precision can be improved.

The invention forms a stable temperature field by arranging a plurality of heating devices on a circumference, a set of reel type boom mechanism and a reference reel are symmetrically arranged in the temperature field, a thermocouple is arranged on the reference reel, and the temperature collected by the thermocouple on the reference reel is used for replacing the temperature of the reel type boom mechanism. The non-contact precision measurement is carried out by adopting the online station building mode of the theodolite, the disturbance to a mechanism is not introduced in the measurement, and the method has the advantages of mature measurement method and high measurement precision.

The method for accurately measuring the thermal deformation of the elastic winding drum by using the system comprises the following steps:

(1) the system is installed as follows:

(11) the method comprises the following steps of (1) keeping a to-be-detected drum type stretching rod mechanism in a non-unfolding state, adjusting the to-be-detected drum type stretching rod mechanism to be vertical to a platform so as to reduce the influence of gravity on unfolding precision of a to-be-detected drum in the unfolding process, and installing the to-be-detected drum type stretching rod mechanism on the platform; the lower end of the reference reel is inserted into the reference reel mounting base with the reference reel in a fully unwound state. The reference reel is kept in the unwound condition at all times. Because the reel to be measured needs to be unfolded and folded in the test process, the length and the position of the reference reel can cover the measurement range of the reel to be measured.

(12) And a thermocouple is adhered on the reference winding drum to control the temperature fluctuation in the heating area within the range of 1 ℃. In the embodiment, 4 groups of heating devices are symmetrically arranged on the periphery of the platform, 7-9 infrared lamp tubes are arranged on each group of heating devices, the strength of each infrared lamp tube is controlled by a thermocouple on the reference winding drum, so that the temperature field in the whole area is controlled, and the temperature fluctuation can be controlled within the range of 1 ℃ by the distance between the heating devices and the number of the infrared lamp tubes. The reference winding drum is unfolded, the thermocouple on the reference winding drum can provide the temperature of the whole temperature field from bottom to top, and the winding drum to be measured of the winding drum type stretching rod mechanism can be unfolded to different heights, so that the thermal deformation under different heights can be measured.

(13) Installing a precise measurement target point and a measurement mirror on a drum type extension rod mechanism to be measured;

(14) multiple groups of heating devices are arranged around the periphery of the platform, the radius of the circle in which the heating devices are arranged is determined according to the heating capacity, and the radius is generally controlled to be equal toIs more suitable;

(15) three theodolites are arranged around the periphery of the heating mechanism, and a position measuring mechanism is utilized to measure the basic relationship between the measuring mirror and the target point, wherein the basic relationship refers to the coordinate value of the target point in the coordinate system of the cubic mirror.

(15) Arranging a fence between the position measuring mechanism and the heating mechanism;

(2) measuring pointing accuracy:

(21) coordinates of the center point of the intermediate target 303 and the center point of the tip target 304 in the coordinate system of the scope (a three-axis coordinate system with the center of the scope as the origin) are measured by a position measuring mechanism.

The middle target 303 includes a plurality of paper targets uniformly distributed on the circumference, and the coordinates of the center of the circle can be obtained from the coordinates of the centers of the plurality of paper targets, and the center of the circle is used as the center point of the middle target 303. The top target 304 is a target ball, and is located on the central axis of the reel, and the center of the target ball is the center point of the top target 304. The pointing accuracy of the line connecting the center point of the middle target 303 and the center point of the top target 304 (i.e., the line connecting the two center points) in the coordinate system of the measuring mirror can be calculated according to the coordinates of the two center points, and then the pointing accuracy of the drum to be measured in the reference coordinate system at room temperature can be obtained through the conversion between the coordinate system of the measuring mirror and the reference coordinate system (the reference coordinate system is a coordinate system formed by the cylinder and the triangular plate at the bottom of the drum-type boom mechanism in fig. 3, the intersection point of the axis of the cylinder and the upper surface of the triangular plate is the origin, and the X direction is the upward direction of the axis of the cylinder).

The pointing accuracy refers to an included angle between a connecting line of the central point of the middle target 303 and the central point of the top target 304 and an X axis of a coordinate system. Of course, other coordinate systems can be set, and the pointing accuracy in the coordinate system of the measuring mirror can be converted into a new coordinate system by performing corresponding coordinate conversion.

(22) Respectively testing the pointing accuracy under different working conditions:

different working conditions refer to different temperatures of the heating area, in the embodiment, the pointing accuracy under three working conditions is measured, and the three working conditions are respectively as follows: the temperature of the heating area is respectively 30 ℃, 60 ℃ and 90 ℃, and the temperature of the heating area is obtained by obtaining the average temperature of all thermocouples on the reference winding drum, namely, the measured values of all thermocouples are averaged to be used as the temperature of the heating area. And the pointing accuracy under more working conditions can be measured according to the requirement.

In each working condition, the temperature change of each temperature measuring point is controlled within the range of 0-4 ℃, the winding drum to be measured is unfolded for 3 times in each working condition (naturally, the winding drum to be measured can be unfolded for more times according to needs), the winding drum to be measured is changed from a folded state to an unfolded state, the pointing accuracy is measured once every time, 3 pointing accuracies are obtained, the measuring mode is the same as that in the step (21), and the average value of the 3 pointing accuracies is taken as the pointing accuracy under the working condition. Specifically, for example, the pointing accuracy of the working condition of 30 degrees is measured, the temperature of the heating area is kept at 30 degrees, the reel to be measured is unfolded, the measurement is performed for the first time, then the reel to be measured is folded, unfolded for the second time, the measurement is performed for the second time, folded again, unfolded for the third time, and the measurement is performed for the third time. When the temperature is changed from one temperature working condition to the next temperature working condition, the temperature of each thermocouple (8 thermocouples in the embodiment) needs to be kept within the variation range of 0-4 degrees, and then the measurement under the new temperature working condition is started, so that the temperature can be guaranteed to be stable.

The three pointing accuracies at the same temperature are transversely compared to obtain the stability and the repeatability of the test, and the influence of the temperature on the pointing accuracy can be obtained by longitudinally comparing the pointing accuracies at different temperatures.

The invention solves the problem of temperature measurement of the movement mechanism and the problem of overlong temperature rise and fall in the vacuum system; the pollution problem caused by directly sticking the thermocouple on the surface of the product by the traditional method is also solved; meanwhile, a heat insulation lampshade is arranged between the infrared lamp and the frame, so that thermal deformation caused by heating the frame is avoided, and the test precision is improved; and the reliability of the test is further improved, and the test cost is greatly reduced.

The above-described embodiment is only one embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be easily made based on the application and principle of the present invention disclosed in the present application, and the present invention is not limited to the method described in the above-described embodiment of the present invention, so that the above-described embodiment is only preferred, and not restrictive.