Guide rail slider device applied to space probe

Abstract

The present invention discloses a guide rail slider device applied to a space probe, comprising: a guide rail mechanism and a slider. The guide rail mechanism is in a convex shape. The slider is slidably disposed on the guide rail mechanism, and a plurality of lubricant material storage bins are provided inside the slider. Among them, the contact surface between the slider and the guide rail mechanism is covered with a molybdenum disulfide composite solid film. Among them, the bottom of the guide rail mechanism is fixedly connected to the body of the space probe. Among them, the top of the slider is used for fixedly installing maintenance and repair equipment. Therefore, the guide rail slider device applied to the space probe of the present invention has a simple and reasonable structure, a long service life, good lubrication effect, wear resistance, and strong load-bearing capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of spatial instrument displacement transmission, and particularly to a guide rail slider device applied to a space probe. Background Art

[0002] At present, most space devices require some mechanisms to transmit displacements in different directions. For example, the fault inspection system and fault repair equipment of a probe need to inspect and repair many parts of the probe body, which requires these devices to reach the positions to be inspected and repaired smoothly and in a timely manner. The guide rail slider mechanism can provide a displacement track for them, which can avoid arranging multiple inspection and repair systems at the positions to be detected on the space device, thus reducing the cost.

[0003] However, in space, due to large temperature variations, most components that require lubrication and the lubricating grease still in use in existing fault detection and repair systems are prone to insufficient lubrication, resulting in frictional wear and transmission failure. In order to enhance lubrication in such a harsh environment, the molybdenum disulfide solid lubrication technology is introduced. As an excellent solid lubricant, molybdenum disulfide has been widely applied in many fields. Especially in high vacuum, its friction coefficient can reach a very low level. However, in high-temperature and low-temperature environments, its tribological properties are significantly limited. Usually, doping molybdenum disulfide with other elements is used to reduce and solve the above effects. However, when the molybdenum disulfide lubricating film is worn more, the lubricating effect will be correspondingly reduced a lot. Therefore, the service life of the guide rail slider mechanism is short, the lubricating effect is poor, and it is not wear-resistant.

[0004] The information disclosed in this background art section is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide a guide rail slider device applied to a space probe, which has a simple and reasonable structure, a long service life, good lubricating effect, wear resistance, and strong load-bearing capacity.

[0006] To achieve the above purpose, the present invention provides a guide rail slider device applied to a space probe, including: a guide rail mechanism and a slider. The guide rail mechanism is in a convex shape. The slider is slidably arranged on the guide rail mechanism, and a plurality of lubricant storage bins are arranged inside the slider. Wherein, the contact surface between the slider and the guide rail mechanism is covered with a molybdenum disulfide composite solid film. Wherein, the bottom of the guide rail mechanism is fixedly connected to the body of the space probe. Wherein, the top of the slider is used for fixedly installing maintenance and repair equipment.

[0007] In an embodiment of the present invention, the guide rail mechanism includes a bottom plate and a bump. The bump is located at the center of the top of the bottom plate, and the bottom plate and the bump are integrally formed.

[0008] In an embodiment of the present invention, T-shaped chutes are respectively formed on both sides of the top of the bottom plate, and both ends of the slider are slidably connected to the T-shaped chutes on both sides of the top of the bottom plate.

[0009] In an embodiment of the present invention, bottom material grooves are respectively formed on both sides of the top of the bottom plate. Both bottom material grooves are located between the two T-shaped chutes, and the two bottom material grooves are respectively used for storing wear waste and lubricating materials.

[0010] In an embodiment of the present invention, the number of the plurality of lubricating material storage bins is two. The two lubricating material storage bins are symmetrically distributed on both sides inside the slider and are formed with inclined channels along the perpendicular direction of the inner corner of the slider. And molybdenum disulfide and Graphene powder are respectively stored in each lubricating material storage bin.

[0011] In an embodiment of the present invention, a metal filter screen and a spring are arranged in each lubricating material storage bin. Molybdenum disulfide and Graphene powder are both located between the upper part of the metal filter screen and the top of the lubricating material storage bin, and one end of the spring abuts against the lower part of the metal filter screen.

[0012] In an embodiment of the present invention, the other end of the spring is used to abut against the molybdenum disulfide composite solid film. When the molybdenum disulfide composite solid film is worn to a preset degree, the other end of the spring abuts against the bump, thereby applying pressure to the spring, and further squeezing the metal filter screen, so that the molybdenum disulfide and Graphene powder in the lubricating material storage bin enter the contact surface between the slider and the guide rail mechanism for auxiliary lubrication.

[0013] In an embodiment of the present invention, the preparation of the molybdenum disulfide composite solid film specifically includes the following steps: Step S1, PVD deposition: ultrasonically clean the surface of the GCr15 substrate, and physically vapor deposit and interleave deposit an Ag layer and an Ag-MoS2 layer by using an unbalanced magnetron sputtering device. Preset relevant parameters, and the deposition time is 15 minutes to 25 minutes. Step S2, surface spraying: first prepare a Graphene solution with absolute ethanol, then ultrasonically oscillate the solution into a suspension, and then load the suspension into a spray gun, and spray a layer of Graphene layer on the film layer prepared in Step S1 by using the spray gun.

[0014] In an embodiment of the present invention, the guide rail slider device applied to a space detector further includes a control motor for controlling the slider to slide on the guide rail mechanism.

[0015] In an embodiment of the present invention, the molybdenum disulfide composite solid film has a stable friction coefficient lower than 0.15 within a wide temperature range from -100°C to 400°C.

[0016] Compared with the prior art, the guide rail slider device applied to a space detector according to the present invention has the following beneficial effects:

[0017] 1. In the present invention, by coating the contact surface between the guide rail mechanism and the slider, the traditional grease lubrication is replaced, providing a stable and good lubrication and anti-wear effect for the contact pair, and being suitable for the outer space with high and low temperature changes; the coating adopts PVD technology plus surface spraying technology. The composite film is composed of a transition layer Ag layer, an Ag-MoS2 layer, an Ag layer, an Ag-MoS2 layer, and a Graphene layer from inside to outside. Among them, the Ag layer and the Ag-MoS2 layer are prepared by PVD technology, and the Graphene layer is sprayed on the Ag-MoS2 layer through surface spraying technology. This way of interspersed coating can give full play to the lubrication synergy of materials to a greater extent, and at the same time greatly improve the wear resistance and service life of the film;

[0018] 2. In the present invention, a lubricant storage bin is arranged on the slider to provide continuous lubrication supply. The auxiliary lubrication is jointly controlled by a metal filter screen and a spring. In the early stage of wear, the lubricant enters the track through the small holes in the metal filter screen to participate in lubrication. At this time, the lubrication is mainly provided by the lubricating film. When the film is worn more severely, the filter screen is opened by the action of the corner of the guide rail mechanism and the spring, so that more lubricating medium can flow into the track to participate in auxiliary lubrication; at the same time, the abrasives and waste generated during friction can flow to the bottom trough through the inclined channel, preventing them from staying on the contact pair surface of the guide rail and the slider all the time, generating secondary friction and wear, and affecting the lubrication effect;

[0019] 3. Through the detection of a scanning electron microscope and a friction and wear testing machine, the lubricating film prepared by the present invention has a neat and smooth surface microtopography and a dense and compact cross-sectional structure. Combining with the auxiliary lubrication function provided by the special structure, it maintains a low and stable friction coefficient within a wide temperature range from -100°C to 400°C, which is overall lower than 0.15. Especially at a low temperature of -100°C, the friction coefficient of the film reaches about 0.04, and the lubrication performance is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional structural schematic diagram of a guide rail slider device applied to a space detector according to an embodiment of the present invention;

[0021] Figure 2 is a side cross-sectional structural schematic diagram of a guide rail slider device applied to a space detector according to an embodiment of the present invention;

[0022] Figure 3It is a top - view structural schematic diagram of a guide rail mechanism of a guide rail slider device applied to a space probe according to an embodiment of the present invention;

[0023] Figure 4 It is a schematic diagram of the surface and cross - section micro - topography of a molybdenum disulfide composite solid film of a guide rail slider device applied to a space probe according to an embodiment of the present invention;

[0024] Figure 5 It is a schematic diagram of the average friction coefficient curve of a molybdenum disulfide composite solid film of a guide rail slider device applied to a space probe at different temperatures according to an embodiment of the present invention.

[0025] Description of main reference numerals:

[0026] 1 - guide rail mechanism, 2 - slider, 3 - lubricant storage bin, 4 - molybdenum disulfide composite solid film, 5 - bolt, 6 - set screw, 7 - T - shaped chute, 8 - bottom chute, 9 - spring, 10 - metal filter screen. Detailed implementation manners

[0027] The following will describe in detail the specific implementation manners of the present invention with reference to the accompanying drawings. However, it should be understood that the protection scope of the present invention is not limited by the specific implementation manners.

[0028] Unless otherwise clearly stated, in the whole specification and claims, the term "comprising" or its variations such as "including" or "having" etc. will be understood to include the stated elements or components, without excluding other elements or other components.

[0029] Figure 1 It is a three - dimensional structural schematic diagram of a guide rail slider device applied to a space probe according to an embodiment of the present invention. Figure 2 It is a side - sectional structural schematic diagram of a guide rail slider device applied to a space probe according to an embodiment of the present invention. Figure 3 It is a top - view structural schematic diagram of a guide rail mechanism of a guide rail slider device applied to a space probe according to an embodiment of the present invention. Figure 4 It is a schematic diagram of the surface and cross - section micro - topography of a molybdenum disulfide composite solid film of a guide rail slider device applied to a space probe according to an embodiment of the present invention. Figure 5 It is a schematic diagram of the average friction coefficient curve of a molybdenum disulfide composite solid film of a guide rail slider device applied to a space probe at different temperatures according to an embodiment of the present invention.

[0030] Figures 1 to 5As shown in the figure, a guide rail slider device applied to a space probe according to a preferred embodiment of the present invention includes: a guide rail mechanism 1 and a slider 2. The guide rail mechanism 1 is in a convex shape. The slider 2 is slidably disposed on the guide rail mechanism 1, and a plurality of lubricant material storage bins 3 are provided inside the slider 2. Among them, the contact surface between the slider 2 and the guide rail mechanism 1 is covered with a molybdenum disulfide composite solid film 4. Among them, the bottom of the guide rail mechanism 1 is fixedly connected to the body of the space probe. Among them, the top of the slider 2 is used for the fixed installation of maintenance and repair equipment.

[0031] In an embodiment of the present invention, the guide rail mechanism 1 includes a bottom plate and a convex block. The convex block is located at the center of the top of the bottom plate, and the bottom plate and the convex block are integrally formed.

[0032] In an embodiment of the present invention, T-shaped sliding grooves 7 are respectively formed on both sides of the top of the bottom plate, and both ends of the slider 2 are slidably connected to the T-shaped sliding grooves 7 on both sides of the top of the bottom plate.

[0033] In an embodiment of the present invention, bottom material grooves 8 are respectively formed on both sides of the top of the bottom plate. Both bottom material grooves 8 are located between the two T-shaped sliding grooves 7, and the two bottom material grooves 8 are respectively used for storing wear scraps and lubricant materials.

[0034] In an embodiment of the present invention, the number of the plurality of lubricant material storage bins 3 is two. The two lubricant material storage bins 3 are symmetrically distributed on both sides inside the slider 2 and are formed with inclined channels along the perpendicular direction of the inner corner of the slider 2. And molybdenum disulfide and Graphene powder are respectively stored in each lubricant material storage bin 3.

[0035] In an embodiment of the present invention, a metal filter screen 10 and a spring 9 are provided in each lubricant material storage bin 3. The molybdenum disulfide and Graphene powder are both located between the upper part of the metal filter screen 10 and the top of the lubricant material storage bin 3, and one end of the spring 9 abuts against the lower part of the metal filter screen 10.

[0036] In an embodiment of the present invention, the other end of the spring 9 is used to abut against the molybdenum disulfide composite solid film 4. When the molybdenum disulfide composite solid film 4 is worn to a preset degree, the other end of the spring 9 abuts against the convex block, so as to apply pressure to the spring 9, and then squeeze the metal filter screen 10, so that the molybdenum disulfide and Graphene powder in the lubricant material storage bin 3 enter the contact surface between the slider 2 and the guide rail mechanism 1 for auxiliary lubrication.

[0037] In an embodiment of the present invention, the preparation of the molybdenum disulfide composite solid film 4 specifically includes the following steps: Step S1, PVD deposition: ultrasonically clean the surface of the GCr15 substrate, and use an unbalanced magnetron sputtering device to physically vapor deposit and interleave the deposition of an Ag layer and an Ag-MoS2 layer. Preset relevant parameters in advance, and the deposition time is 15 minutes to 25 minutes. Step S2, surface spraying: first prepare a Graphene solution with absolute ethanol, then ultrasonically oscillate the solution into a suspension, and then load the suspension into a spray gun, and use the spray gun to spray a Graphene layer on the film layer prepared in Step S1.

[0038] In an embodiment of the present invention, the guide rail slider device applied to a space detector further includes a control motor for controlling the slider 2 to slide on the guide rail mechanism 1.

[0039] In an embodiment of the present invention, in the wide temperature range of -100°C to 400°C, the stable friction coefficient of the molybdenum disulfide composite solid film 4 is lower than 0.15.

[0040] In practical applications, the guide rail slider device of the present invention applied to a space probe includes a guide rail mechanism 1, a slider 2, a metal filter screen 10, a spring 9, and a molybdenum disulfide composite solid film 4. A lubricant storage bin 3 is arranged inside the slider 2. At the bottom of the guide rail mechanism 1, a bottom material groove 8 is opened on each side, which can provide temporary storage for wear waste and lubricant. On the surface of the guide rail mechanism 1, a T-shaped sliding groove 7 is opened on each side for connecting the guide rail mechanism 1 and the slider 2. A molybdenum disulfide composite solid film 4 is covered on the contact surface between the slider 2 and the guide rail mechanism 1. The lubricant storage bin 3 is arranged inside the slider 2 and is symmetrically distributed on both sides, and is formed into an inclined channel by opening through along the perpendicular direction of the inner corner of the slider 2. Molybdenum disulfide and Graphene powder are respectively stored on both sides in the lubricant storage bin 3. The spring 9 and the metal filter screen 10 are placed in the lubricant storage bin 3, and the filter screen is aligned with the inclined channel opening to close the lubricant storage bin 3. The T-shaped sliding groove 7 and the bottom material groove 8 are distributed on the guide rail mechanism 1, and the length of the sliding groove is shorter than the total length of the guide rail mechanism 1. Threaded holes are distributed at the four corners of the bottom of the slider 2 for connecting bolts 5, and the heads of the bolts 5 are embedded in the T-shaped sliding groove 7 of the guide rail mechanism 1. The molybdenum disulfide composite solid film 4 covering the contact surface between the slider 2 and the guide rail mechanism 1 is an alternating multi-layer film structure of an Ag layer / Ag-MoS2 layer, and the outermost layer on the substrate surface is a Graphene layer. The molybdenum disulfide composite solid film 4 has a stable friction coefficient lower than 0.15 in the wide temperature range of -100°C - 400°C. The lubricant storage bin 3 is first processed with a milling machine to form a channel, then the inner bin is processed with a boring machine, and finally polished. The T-shaped sliding groove 7 and the bottom material groove 8 are processed by a machining center, and the threaded holes in the bottom material groove 8 and the threaded holes on the lower end surface of the slider 2 are processed by a drilling machine and a lathe. The slider 2 and the corresponding detection equipment can be matched through threaded connection and other methods, and the sliding of the slider 2 on the guide rail mechanism 1 can be controlled by a motor.

[0041] The present invention improves the lubrication performance and working reliability in high and low temperature environments by improving the guide rail slider 2 mechanism, adding auxiliary lubricants, and combining with a molybdenum disulfide composite film. The present invention is used to provide an axial displacement track for some components that need to work at different positions on the detector body, and has the advantages of long service life, good lubrication effect, wear resistance, and strong load-bearing capacity, solving the problem that the contact pair friction coefficient of existing similar devices increases and the wear resistance decreases in the harsh space environment of high temperature or low temperature, affecting their normal operation.

[0042] The bottom end of the guide rail mechanism 1 is connected to the detector body using set screws 6, and the upper end is used to cooperate with the slider 2. There are two bottom material grooves 8 arranged at the lower end of the guide rail mechanism 1. The bottom of the slider 2 is fitted with the guide rail through bolts 5, and the top is used to connect the corresponding detection devices and equipment. Two lubricant storage bins 3 are designed inside the slider 2. Each lubricant storage bin 3 stores molybdenum disulfide solid lubricant powder and Graphene powder. A metal filter screen 10 is used to enclose the lubricant in the storage bin, and the lower end is respectively connected to two springs 9 at the front and back. The springs 9 are used to control the lubricant powder to enter the contact surface between the slider 2 and the guide rail for auxiliary lubrication.

[0043] The metal filter screen 10 allows a small amount of lubricant to enter the track for lubrication. When the film on the slider 2 and the guide rail mechanism 1 wears to a certain extent, the filter screen is opened by the action of the corner of the guide rail mechanism 1 and the spring 9, and then more lubricating medium can flow into the track to participate in the auxiliary lubrication. A multi-layer Ag-MoS2-Graphene composite solid lubricating film is interspersed and plated on the outer surface of the guide rail mechanism 1 and the inner surface of the slider 2. The composite solid lubricating film is composed of an Ag layer, an Ag-MoS2 layer, and a Graphene layer. The Ag layer, as a transition layer, can increase the overall adhesion of the film. Ag has good ductility, and when it is compounded with MoS2, an Ag-MoS2 layer is obtained. The outermost layer is sprayed with a Graphene layer. The lubricating film is prepared by PVD technology plus surface spraying technology. Among them, the Ag layer and the Ag-MoS2 layer are prepared by PVD, and the Graphene layer is obtained by surface spraying technology. The prepared Graphene suspension with a modulated ratio is sprayed on the surface using a spray gun. The film-substrate combination is good, and the surface roughness is low.

[0044] As Figure 3 shown, the guide rail mechanism 1 and the slider 2 are connected by bolts 5. The bolts 5 are tightened with the slider 2 through threads. The bolt heads are embedded in the T-shaped chute 7 of the guide rail mechanism 1, a total of four. Only two are shown in the cross-section in the figure. The lubricant storage bins 3 are located inside the slider 2, one on each side, distributed at an angle of about 45°. Each bin contains Graphene powder and molybdenum disulfide solid powder. The metal filter screen 10 is placed in the lubricant storage bin 3, and the lower end is connected to two springs 9. The springs 9 are located in the inclined channel. The molybdenum disulfide composite film is plated on the inner wall of the slider 2.

[0045] The friction coefficient of the molybdenum disulfide composite solid film 4 of the present invention within the range of -100°C to 400°C is measured by a UMT friction and wear testing machine. The low-temperature environment is provided by liquid nitrogen, and the high-temperature environment is realized by the heating module in the testing machine. The test time is 30 minutes for all, the load is 8 N, and the rotation speed is 400 r / min. The surface and cross-sectional morphology of the film are observed by a scanning electron microscope.

[0046] Example 1

[0047] Storage bin processing: First, use a milling machine to roughly mill an inclined channel, then use a boring machine to roughly bore the inner bin, then perform finish machining separately, and finally polish.

[0048] Processing of T-shaped chute 7 and bottom chute 8: Both can be processed by a machining center. For the T-shaped chute 7, first use a face milling cutter of a vertical machining center to mill a straight groove. After machining the straight groove according to the depth and width dimensions required for the T-slot, replace the T-slot milling cutter, and then use the T-slot milling cutter to machine along the straight groove to complete.

[0049] The threaded holes in the chute and the threaded holes on the lower end face of the slider 2 are first drilled with a drill press, and then the threads are turned with a form turning tool on a lathe.

[0050] Preparation of molybdenum disulfide composite solid lubricating film:

[0051] Step S1, PVD deposition: Ultrasonically clean the surface of GCr15, and use an unbalanced magnetron sputtering device to physically vapor deposit two layers of Ag layer and two layers of Ag-MoS2 layer alternately. Set the relevant parameters in advance, and the deposition time for each layer is 15 min.

[0052] Step S2, surface spraying: First, prepare a Graphene solution with absolute ethanol, then ultrasonically oscillate the solution into a suspension, and then load the suspension into a spray gun. Use the spray gun to spray a layer of Graphene layer on the Ag layer and Ag-MoS2 layer completed by PVD deposition.

[0053] Film morphology detection: Use a field emission scanning electron microscope of the SUPRA-55 model to observe the surface and cross-section micro-morphologies of the prepared film, and judge whether the film structure prepared by interpenetrating coating is dense and compact through the morphology observation.

[0054] Friction coefficient detection at -100°C - 400°C: Use a UMT friction and wear tester to detect the friction coefficient of the film and the auxiliary lubrication effect of the designed structure. First, install the slider 2 guide rail in the experimental chamber and evacuate for 5 min, then introduce liquid nitrogen to cool the chamber. The low-temperature test temperatures are 0°C, -25°C, -50°C, -75°C, and -100°C. After the low-temperature test, stop inputting liquid nitrogen, and use the heating module to heat the chamber to the high-temperature detection temperature and perform high-temperature tribology tests. The high-temperature test temperatures are RT, 100°C, 200°C, 300°C, and 400°C.

[0055] During the friction and wear test, at room temperature and a relatively high temperature of 400 °C, more lubricating powder in the auxiliary lubrication chamber was consumed. In the later stage of the experiment, the solid lubricating film on the surface of the slider 2 at 400 °C was worn more severely. The metal filter screen 10 was opened by the spring 9, so that more auxiliary lubricating powder infiltrated into the contact pair surface and participated in the later lubrication to ensure the low friction coefficient and effective lubrication required by the guide rail slider 2. On the contrary, at other temperatures with milder conditions, a small amount of solid powder in the auxiliary lubrication chamber entered the friction surface through the metal filter screen 10 to participate in the auxiliary lubrication, and the solid film was also partially worn. Under the action of the spring 9, only a small part of the metal filter screen 10 was opened, and only a little Graphene powder and molybdenum disulfide solid powder were consumed to meet the lubrication requirements.

[0056] Example 2

[0057] Storage bin processing: First, use a milling machine to rough-mill an inclined channel, then use a boring machine to rough-bore the inner bin, then perform finish machining respectively, and finally polish.

[0058] Processing of the T-shaped chute 7 and the bottom chute 8: Both can be processed by a machining center. Among them, for the T-shaped chute 7, first use a flat milling cutter of a vertical machining center to mill a straight groove. After machining the straight groove according to the depth and width dimensions required by the T-slot, replace the T-slot milling cutter, and then use the T-slot milling cutter to process along the straight groove to complete.

[0059] The threaded holes in the chute and the threaded holes on the lower end surface of the slider 2 are first drilled with a drill press, and then the threads are turned with a form tool on a lathe.

[0060] Preparation of molybdenum disulfide self-lubricating composite film:

[0061] Step S1, PVD deposition: Ultrasonically clean the surface of GCr15, and use an unbalanced magnetron sputtering device to physically vapor deposit two layers of Ag layer and two layers of Ag-MoS2 layer alternately. Preset the relevant parameters, and the deposition time for each layer is 20 min.

[0062] Step S2, surface spraying: First, prepare a Graphene solution with absolute ethanol, then ultrasonically vibrate the solution into a suspension, and then load the suspension into a spray gun. Use the spray gun to spray a layer of Graphene layer on the Ag layer and Ag-MoS2 layer completed by PVD deposition.

[0063] Film morphology detection: Use a - field emission scanning electron microscope of model SUPRA 55 to observe the surface and cross-section microtopography of the prepared film. Through the topography observation, judge whether the film microstructure prepared by the interpenetrating coating is dense and compact. The observed cross-section and surface topography diagrams are as Figure 4 shown.

[0064] Coefficient of friction detection at -100°C - 400°C: The UMT friction and wear testing machine is used to detect the coefficient of friction of the thin film and the auxiliary lubrication effect of the designed structure. First, install the slider 2 guide rail in the experimental chamber and evacuate it for 5 minutes, then introduce liquid nitrogen to cool the chamber. The low-temperature test temperatures are 0°C, -25°C, -50°C, -75°C, and -100°C. After the low-temperature test, stop inputting liquid nitrogen, and use the heating module to heat the chamber to the high-temperature detection temperature for high-temperature tribology testing. The high-temperature test temperatures are RT, 100°C, 200°C, 300°C, and 400°C.

[0065] During the friction and wear test, at room temperature and the relatively high temperature of 400°C, more lubricating powder in the auxiliary lubrication chamber is consumed. In the later stage of the experiment, the solid lubricating thin film on the surface of the slider 2 wears more severely at 400°C, and the metal filter screen 10 opens through the spring 9, so that more auxiliary lubricating powder enters the contact pair surface and participates in the later lubrication to ensure the low coefficient of friction and effective lubrication required for the guide rail slider 2. On the contrary, at other temperatures with milder conditions, a small amount of solid powder in the auxiliary lubrication chamber enters the friction surface through the metal filter screen 10 to participate in auxiliary lubrication, and the solid thin film is also partially worn. Under the action of the spring 9, only a small part of the metal filter screen 10 opens, and only a small amount of Graphene powder and molybdenum disulfide solid powder are consumed to meet the lubrication requirements.

[0066] The experimentally measured average stable coefficient of friction curve under the combined action of the intercalated and deposited molybdenum disulfide composite solid lubricating thin film and the auxiliary lubricating material at different temperatures is as Figure 5 shown. The overall coefficient of friction is lower than 0.15, which is the best in the three embodiments. Moreover, the coefficient of friction reaches the lowest value of 0.04 at -100°C and also shows good tribological performance at the high temperature of 400°C.

[0067] Example 3

[0068] Storage bin processing: First, use a milling machine to rough mill an inclined channel, then use a boring machine to rough bore the inner bin, then perform finish machining respectively, and finally polish.

[0069] Processing of the T-shaped chute 7 and the bottom chute 8: Both can be processed by a machining center. For the T-shaped chute 7, first use a flat milling cutter of a vertical machining center to mill a straight groove. After machining the straight groove according to the depth and width dimensions required for the T groove, replace the T groove milling cutter and then use the T groove milling cutter to process along the straight groove to complete.

[0070] The threaded holes in the chute and the threaded holes on the lower end surface of the slider 2 are first drilled with a drill press, and then the threads are turned with a form tool on a lathe.

[0071] Preparation of molybdenum disulfide self-lubricating composite thin film:

[0072] S1, PVD deposition: Ultrasonically clean the surface of GCr15. Use an unbalanced magnetron sputtering device to physically vapor deposit two layers of Ag layer and two layers of Ag-MoS2 layer alternately. Preset relevant parameters in advance, and the deposition time for each layer is 25 minutes.

[0073] S2, surface spraying: First, prepare a Graphene solution with absolute ethanol, then ultrasonically oscillate the solution into a suspension, and then load the suspension into a spray gun. Use the spray gun to spray a layer of Graphene layer on the Ag layer and Ag-MoS2 layer completed by PVD deposition.

[0074] Film morphology detection: Use a field emission scanning electron microscope of model SUPRA - 55 to observe the surface and cross-section microtopography of the prepared film. Through the topography observation, judge whether the film structure prepared by the interpenetrating coating is dense and compact.

[0075] Friction coefficient detection at -100°C - 400°C: Use a UMT friction and wear testing machine to detect the friction coefficient of the film and the auxiliary lubrication effect of the designed structure. First, install the slider 2 guide rail in the experimental chamber and evacuate for 5 minutes, then introduce liquid nitrogen to cool the chamber. The low-temperature test temperatures are 0°C, -25°C, -50°C, -75°C, and -100°C. After the low-temperature test, stop inputting liquid nitrogen, use the heating module to heat the chamber to the high-temperature detection temperature and conduct high-temperature tribological tests. The high-temperature test temperatures are RT, 100°C, 200°C, 300°C, and 400°C.

[0076] During the friction and wear test, at room temperature and a relatively high temperature of 400°C, more lubricating powder in the auxiliary lubrication chamber is consumed. In the later stage of the experiment, the solid lubricating film on the surface of the slider 2 at 400°C wears more severely, and the metal filter screen 10 is opened by the spring 9, so that more auxiliary lubricating powder enters the contact pair surface and participates in the later lubrication to ensure the low friction coefficient and effective lubrication required by the guide rail slider 2. On the contrary, at other temperatures with milder conditions, a small amount of solid powder in the auxiliary lubrication chamber enters the friction surface through the metal filter screen 10 to participate in auxiliary lubrication, and the solid film is also partially worn. Under the action of the spring 9, only a small part of the metal filter screen 10 is opened, and only a little Graphene powder and molybdenum disulfide solid powder are needed to meet the lubrication requirements.

[0077] In summary, the guide rail slider device of the present invention applied to a space detector has the following beneficial effects:

[0078] 1. The present invention replaces the traditional grease lubrication by coating the contact surface between the guide rail mechanism 1 and the slider 2, providing a stable and good lubrication and anti-wear effect for the contact pair, and being suitable for the outer space with high and low temperature variations; the coating adopts PVD technology plus surface spraying technology, and the composite film is composed of a transition layer Ag layer, an Ag-MoS2 layer, an Ag layer, an Ag-MoS2 layer and a Graphene layer from inside to outside. Among them, the Ag layer and the Ag-MoS2 layer are prepared by PVD technology, and the Graphene layer is sprayed on the Ag-MoS2 layer by surface spraying technology. This way of interspersed coating can give full play to the lubrication synergistic effect of the materials to a greater extent, and at the same time greatly improve the wear resistance and service life of the film;

[0079] 2. The present invention provides continuous lubrication supply by arranging a lubricant storage bin 3 on the slider 2. Among them, the auxiliary lubrication is jointly controlled by the metal filter screen 10 and the spring 9. In the early stage of wear, the lubricant enters the track through the small holes on the metal filter screen 10 to participate in lubrication. At this time, the lubrication is mainly provided by the lubricating film. When the film is worn more seriously, the filter screen is opened by the action of the corner of the guide rail mechanism 1 and the spring 9, so that more lubricating medium can flow into the track to participate in auxiliary lubrication; at the same time, the abrasives and waste generated during friction can flow to the bottom chute 8 through the inclined channel, preventing them from staying on the contact pair surface of the guide rail and the slider 2 all the time, generating secondary friction and wear, and affecting the lubrication effect;

[0080] 3. Through the detection of a scanning electron microscope and a friction and wear testing machine, the lubricating film prepared by the present invention has a neat and smooth surface microtopography and a dense and compact cross-sectional structure. Combining with the auxiliary lubrication function provided by the special structure, it maintains a low and stable friction coefficient in the wide temperature range of -100°C to 400°C, with the overall being lower than 0.15. Especially at the low temperature of -100°C, the friction coefficient of the film reaches about 0.04, and the lubrication performance is good.

[0081] The foregoing description of the specific exemplary embodiments of the present invention is for the purposes of illustration and exemplification. These descriptions are not intended to limit the present invention to the precise forms disclosed, and obviously, many changes and variations are possible in light of the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical applications, so that those skilled in the art can implement and utilize various different exemplary embodiments of the present invention, as well as various different selections and changes. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A guide rail slider device applied to a space probe, characterized in that, Including: A guide rail mechanism, in a convex shape; and A slider, which is slidably arranged on the guide rail mechanism, and two lubricant material storage bins are arranged inside the slider; Wherein, the contact surface between the slider and the guide rail mechanism is covered with a molybdenum disulfide composite solid film; Wherein, the bottom of the guide rail mechanism is fixedly connected to the body of the space detector; Wherein, the top of the slider is used for fixedly installing maintenance and repair equipment; Wherein, the guide rail mechanism includes a bottom plate and a convex block, the convex block is located at the center of the top of the bottom plate, and the bottom plate and the convex block are integrally formed; Wherein, the two lubricant material storage bins are symmetrically distributed on both sides inside the slider, and inclined channels are formed by drilling along the perpendicular direction of the inner corner of the slider, and molybdenum disulfide and Graphene powder are respectively stored in each lubricant material storage bin; Wherein, a metal filter screen and a spring are arranged in each lubricant material storage bin, the molybdenum disulfide and the Graphene powder are both located between the upper part of the metal filter screen and the top of the lubricant material storage bin, and one end of the spring abuts against the lower part of the metal filter screen; Wherein, the other end of the spring is used to abut against the molybdenum disulfide composite solid film. When the molybdenum disulfide composite solid film is worn to a preset degree, the other end of the spring abuts against the convex block, thereby applying pressure to the spring, and then extruding the metal filter screen, so that the molybdenum disulfide and the Graphene powder in the lubricant material storage bin enter the contact surface between the slider and the guide rail mechanism for auxiliary lubrication.

2. The guide rail slider device applied to a space probe according to claim 1, characterized in that, T-shaped chutes are respectively formed on both sides of the top of the bottom plate, and both ends of the slider are slidably connected to the T-shaped chutes on both sides of the top of the bottom plate.

3. The guide rail slider device applied to a space probe according to claim 2, characterized in that, Bottom material grooves are respectively formed on both sides of the top of the bottom plate, both of the two bottom material grooves are located between the two T-shaped chutes, and the two bottom material grooves are respectively used for storing worn waste and lubricant materials.

4. The guide rail slider device applied to a space probe according to claim 1, characterized in that, The preparation of the molybdenum disulfide composite solid film specifically includes the following steps: Step S1, PVD deposition: ultrasonically clean the surface of the GCr15 substrate, and physically vapor deposit and interleave deposit an Ag layer and an Ag-MoS2 layer by using an unbalanced magnetron sputtering device, preset relevant parameters, and the deposition time is 15 minutes to 25 minutes; Step S2, surface spraying: first prepare a Graphene solution with absolute ethanol, then ultrasonically oscillate the solution into a suspension, and then load the suspension into a spray gun, and use the spray gun to spray a Graphene layer on the film layer prepared in Step S1.

5. The guide rail slider device applied to a space probe according to claim 4, characterized in that, The molybdenum disulfide composite solid film has a stable friction coefficient lower than 0.15 in a wide temperature range from -100°C to 400°C.

6. The guide rail slider device applied to a space probe according to claim 1, characterized in that, It also includes a control motor, which is used to control the sliding of the slider on the guide rail mechanism.

Images