A linear motion device for weightless environment

Abstract

The present invention discloses a linear motion device for weightless environment, comprising: a first main body, rotatably connected with a first roller, the first roller rotates through a driving assembly; a second main body, fixed with a linear guide assembly, the first roller is arranged on the linear guide assembly, and can roll along the linear guide assembly to drive the first main body to do linear motion; a clamping assembly, the two ends of which are respectively connected to the first main body and the second main body, and the clamping assembly is slidably connected to the first main body and / or the second main body, the clamping assembly simultaneously generates pressure on the first main body and the second main body in opposite directions, so that pressure is generated between the first roller and the linear guide assembly, and when the first roller rotates, friction is generated by pressure to make the first roller roll. The device does not rely on gravity, moves smoothly, has a small size and a large stroke.

Description

Technical Field

[0001] The invention belongs to the technical field of linear motion mechanisms, and in particular relates to a linear motion device used in a weightless environment. Background Art

[0002] Linear reciprocating motion devices often convert rotational motion into linear motion. However, in gravity-free space fields such as aerospace, linear reciprocating motion devices need to maintain normal operation in a weightless environment.

[0003] The linear reciprocating motion devices used in weightless environments include: connecting rod mechanism, gear rack mechanism, screw transmission mechanism, belt chain transmission mechanism and rope transmission, etc.

[0004] Connecting rod mechanisms, such as the crank slider mechanism, Poussellier-Lipkin mechanism, Sarus mechanism, Hawken mechanism, etc., have the advantages of simple lubrication, strong designability, low cost, strong load-bearing capacity, and reliable operation. However, they have problems such as small stroke, large envelope, large mass, many active joints, and low efficiency, which seriously limit their application in fields such as aerospace that have high requirements on quality and envelope.

[0005] The rack and pinion mechanism has a long service life, stable operation and high reliability, but it has problems such as high installation and manufacturing requirements, heavy weight, large envelope and difficult lubrication under long travel conditions.

[0006] Screw transmission is a precision fit and requires high precision in installation and processing, making it difficult to achieve long-distance transmission.

[0007] Chain, belt or rope transmission has a simple structure, is flexible, and has low installation requirements. It is suitable for linear transmission in open spaces, but there are problems such as tension design and long-distance transmission link design that affect life and reliability. Summary of the invention

[0008] In order to solve the above problems, the purpose of the present invention is to provide a linear motion device for use in a weightless environment, which does not rely on gravity, moves smoothly, has a small size and a large stroke.

[0009] To achieve the above object, the technical solution of the present invention is:

[0010] A linear motion device for use in a weightless environment, characterized by comprising:

[0011] A first body is rotatably connected to a first roller, and the first roller is rotated by a driving assembly;

[0012] The second body is fixed with a linear guide assembly, the first roller is arranged on the linear guide assembly, and can roll along the linear guide assembly to drive the first body to perform linear motion;

[0013] A clamping assembly, whose two ends are respectively connected to the first body and the second body, and the clamping assembly is slidably connected to the first body and / or the second body. The clamping assembly simultaneously generates pressure in opposite directions on the first body and the second body, so that pressure is generated between the first roller and the linear guide assembly. When the first roller rotates, friction is generated through pressure to make the first roller roll.

[0014] According to one embodiment of the present invention, the linear guide assembly is two first guide plates arranged obliquely to each other, the first roller is arranged between the two first guide plates and contacts the sides of both at the same time, and the first roller rolls by generating friction with the sides of the two first guide plates.

[0015] According to one embodiment of the present invention, the pressing assembly comprises:

[0016] A connecting rod, the first end of which is passed through the first body and provided with a limiting portion, and the second end of which is slidably connected to the second body;

[0017] An elastic member is arranged between the first body and the limiting portion, one end of the elastic member applies pressure to the first body toward the second body; the other end of the elastic member applies pressure to the limiting portion away from the second body, so that the second end of the connecting rod applies pressure to the second body toward the first body.

[0018] According to an embodiment of the present invention, the second body is provided with a second guide plate, the second end of the connecting rod is rotatably connected to a second roller, and the second roller is provided on an end surface of the second guide plate away from the first body.

[0019] According to one embodiment of the present invention, the first main body is provided with a receiving groove, the connecting rod is inserted into the receiving groove, the elastic member is provided in the receiving groove and sleeved on the connecting rod, the limiting portion is located at one end of the receiving groove away from the second main body, one end of the elastic member is in conflict with one end surface of the receiving groove away from the limiting portion, and the other end is in conflict with the limiting portion.

[0020] According to an embodiment of the present invention, the limiting portion is a blocking cover, and the blocking cover is threadedly connected to the connecting rod.

[0021] According to an embodiment of the present invention, the driving assembly comprises:

[0022] A transmission shaft, rotatably connected to the first body, the first roller is fixedly connected to the transmission shaft, and the transmission shaft is provided with a first gear;

[0023] The driving device is arranged on the first main body, and the output shaft of the driving device is provided with a second gear, and the first gear is meshed with the second gear.

[0024] According to one embodiment of the present invention, the first guide rail plate is installed on the second body through an adjustment seat, the adjustment seat is provided with a first mounting surface and a second mounting surface inclined to each other, the first guide rail plate is provided on the first mounting surface, and the second mounting surface is provided on the second body.

[0025] According to an embodiment of the present invention, the elastic member is a spring.

[0026] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0027] (1) In the embodiment of the present invention, a clamping assembly is provided, which simultaneously generates pressure on the first body and the second body in opposite directions, so that pressure is generated between the first roller and the linear guide assembly. When the first roller rotates, friction is generated by the pressure to make the first roller roll. This allows the device to perform linear motion in a zero-gravity environment, and the motion is relatively stable.

[0028] (2) In the embodiment of the present invention, the linear guide assembly is two first guide plates that are arranged obliquely to each other. The first roller is arranged between the two first guide plates and contacts the sides of both of them at the same time, so that the first roller can roll on the two first guide plates. The two first guide plates are arranged obliquely to fix the first roller axially so that it can roll along a straight line, making the device smaller in size and having a larger stroke.

[0029] (3) In the embodiment of the present invention, the clamping assembly includes a connecting rod and an elastic member, and the first roller and the linear guide assembly are clamped by the elastic force of the elastic member, making the overall structure simpler and more practical.

[0030] (4) In the embodiment of the present invention, the sliding connection between the connecting rod and the second main body is realized by the second roller and the second guide plate, so that the bearing capacity is stronger, and when there is a large clamping force between the second roller and the second guide plate, the second roller can still roll well on the second guide plate, so that the sliding effect of the connecting rod and the second main body is better.

[0031] (5) In the embodiment of the present invention, the elastic member is arranged in the receiving groove, making the overall structure more compact.

[0032] (6) In the embodiment of the present invention, the first guide plate is installed on the second body through the adjustment seat, which makes the installation of the first guide plate more convenient, and the inclination of the first guide plate can be adjusted by replacing or adjusting the inclination of the adjustment seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0034] Figure 1 It is an overall schematic diagram of a linear motion device for use in a weightless environment according to the present invention;

[0035] Figure 2 An exploded view of a linear motion device for use in a weightless environment according to the present invention;

[0036] Figure 3 A partial schematic diagram of a linear motion device for weightless environment of the present invention Figure 1 ;

[0037] Figure 4 A partial schematic diagram of a linear motion device for weightless environment of the present invention Figure 2 .

[0038] Description of reference numerals:

[0039] 1: first body; 2: first roller; 3: first guide plate; 4: connecting rod; 5: second guide plate; 6: second roller; 7: spring; 8: clamping release device; 9: blocking cover; 10: transmission shaft; 11: first gear; 12: output shaft; 13: second gear; 14: driving device; 15: adjustment seat; 16: mounting bracket; 17: mounting seat. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise ratios, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0041] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0042] See also Figures 1 to 4 The core of the present invention is to provide a linear motion device for a weightless environment, including a first main body 1, a second main body and a clamping assembly. The first main body 1 is rotatably connected to a first roller 2, and the first roller 2 is rotated by a driving assembly; a linear guide assembly is fixedly provided on the second main body, and the first roller 2 is arranged on the linear guide assembly; the clamping assembly generates pressure between the first roller 2 and the linear guide assembly, and when the first roller 2 rotates, friction is generated through pressure to make the first roller 2 roll.

[0043] The friction force is generated between the first roller 2 and the linear guide assembly through pressure, so that the first roller 2 can move linearly along the linear guide assembly to drive the first body 1 to move linearly, so that the device can move linearly in a zero-gravity environment and move more smoothly.

[0044] The linear motion device for weightlessness environment of the present invention is described in detail below:

[0045] The first body 1 is a frame structure, which is used to carry the structure and working load of the present invention, and the working load moves with the first body 1 .

[0046] The driving assembly includes a transmission shaft 10 and a driving device 14. The transmission shaft 10 is disposed through the first body 1. Both sides of the transmission shaft 10 are rotatably connected to the first body 1 through bearings. The transmission shaft 10 is fixedly connected with a first roller 2. The number of transmission shafts 10 and the number of first rollers 2 provided on each transmission shaft 10 are not limited. In this embodiment, two transmission shafts 10 are provided, and a first roller 2 is provided on both sides of each transmission shaft 10.

[0047] The transmission shaft 10 is sleeved and fixedly connected with a first gear 11, and the driving device 14 is installed on the first body 1. The first body 1 is also provided with two mounting seats 17, and the output shaft 12 of the driving device 14 is penetrated by the two mounting seats 17 and is rotatably connected to the two mounting seats 17 through bearings, and the output shaft 12 is sleeved and fixedly connected with a second gear 13, and the second gear 13 is located between the two mounting seats 17, the first gear 11 and the second gear 13 are meshed, and the output shaft 12 rotates, and the transmission shaft 10 is driven to rotate through the first gear 11 and the second gear 13, and the transmission shaft 10 drives the first roller 2 to rotate. The driving device 14 is a motor, or a combination of a motor and a reducer.

[0048] Multiple motors can also be set up to back up each other. When working, one of the motors is powered on and rotates, driving the corresponding transmission shaft 10 to rotate. At this time, the transmission shaft 10 is the active shaft, the motor is the active motor, and the other motors are idle. When the active motor fails, the backup motor is powered on to drive the device to move.

[0049] The second body in this embodiment is composed of a plurality of mounting brackets 16. In this embodiment, a group of mounting brackets 16 is provided on each side, and each group is composed of five mounting brackets 16. Of course, the number of mounting brackets 16 is not limited, and other numbers and arrangements may be used in other embodiments. The number of linear guide components is also correspondingly provided with two, which are respectively installed on the five mounting brackets 16 on both sides.

[0050] The linear guide assembly is two first guide rail plates 3 arranged at an angle to each other. The first guide rail plates 3 are long strip plates installed on the mounting bracket 16. The two first guide rail plates 3 form a V shape, and there is a certain gap between the two guide rail plates. The first roller 2 is arranged between the two first guide rail plates 3 and contacts the sides facing each other at the same time. The two first guide rail plates 3 are arranged at an angle to fix the first roller 2 axially so that it can roll along a straight line, making the device smaller in size and having a larger stroke. The V shape can prevent the first roller 2 from "derailing" during movement, while reducing the difficulty of processing the guide rail plate and making the structure simpler.

[0051] The first guide plate 3 is mounted on the mounting bracket 16 through the adjustment seat 15. Specifically, one is mounted on each mounting bracket 16. The adjustment seat 15 is provided with a first mounting surface and a second mounting surface inclined to each other. The first guide plate 3 is provided on the first mounting surface, and the second mounting surface is provided on the mounting bracket 16, so as to mount the adjustment seat 15 on the mounting bracket 16. The adjustment seat 15 makes it more convenient to install the first guide plate 3, and the inclination of the first guide plate 3 can be adjusted by replacing or adjusting the inclination of the adjustment seat 15, and a gasket can also be added between the first mounting surface and the first guide plate 3 to achieve fine adjustment of the position and inclination of the first guide plate 3.

[0052] The two ends of the clamping assembly are respectively connected to the first body 1 and the second body, and the clamping assembly is slidably connected to the first body 1 and / or the second body. The clamping assembly simultaneously generates pressure on the first body 1 and the second body, so that pressure is generated between the first roller 2 and the side surfaces of the two first guide rails 3. When the first roller 2 rotates, friction is generated through pressure to roll on the two first guide rails 3. The rotation of the first roller 2 drives the first body 1 to perform linear reciprocating motion. When the first body 1 moves linearly, the clamping assembly slides on the first body 1, or drives the clamping assembly to slide on the second body.

[0053] The clamping assembly includes a connecting rod 4 and an elastic member, and the number of the clamping assemblies is not limited and can be flexibly changed according to the design requirements. In this embodiment, a clamping assembly is provided on each side of the first body 1. The first end of the connecting rod 4 is passed through the first body 1 and is provided with a limit portion, and the second end is slidably connected to the second body. The elastic member is provided between the first body 1 and the limit portion, and one end of the elastic member applies pressure to the first body 1 toward the second body; the other end of the elastic member applies pressure to the limit portion away from the second body, so that the second end of the connecting rod 4 applies pressure to the second body toward the first body 1, that is, the first body 1 and the second body are pressed against each other, that is, the first roller 2 and the first guide plate 3 are pressed against each other.

[0054] Specifically, the first body 1 is provided with a receiving groove, the connecting rod 4 is inserted into the receiving groove, the elastic member is a spring 7 in this embodiment, the spring 7 is provided in the receiving groove and sleeved on the connecting rod 4, the limiting part is located at one end of the receiving groove away from the second body, the limiting part is a stopper 9 in this embodiment, and the stopper 9 is threadedly connected to the connecting rod 4, and the threaded connection is convenient for installation and disassembly. One end of the spring 7 is in conflict with one end face of the receiving groove away from the stopper 9, and the other end is in conflict with the stopper 9, and the spring 7 is in a compressed state. The provision of the receiving groove makes the overall structure more compact.

[0055] The second body is provided with a second guide rail plate 5. In this embodiment, a group of second guide rail plates 5 is provided on both sides of the second body, each group is composed of two second guide rail plates 5 arranged in parallel, and the two second guide rail plates 5 are installed on five mounting brackets 16 and are located below the two first guide rail plates 3. There is a certain gap between the two second guide rail plates 5.

[0056] The connecting rod 4 is inserted into the gap between the two first guide rails 3 and the gap between the two second guide rails 5. The second end of the connecting rod 4 extends to the side of the second guide rail 5 away from the first main body 1, and a cross bar is provided on the connecting rod 4 on this side, that is, the connecting rod 4 is T-shaped as a whole, and a second roller 6 is rotatably connected to each of the two sides of the cross bar, and the two second rollers 6 are respectively in contact with one end surface of the two second guide rails 5 away from the first main body 1. When there is a large clamping force between the second roller 6 and the second guide rail 5, the second roller 6 can still be well rolled on the second guide rail 5, so that the sliding effect of the connecting rod 4 and the second main body is better, that is, the clamping assembly can provide a larger positive pressure, ensure the smooth movement of the first main body 1, and avoid interference during the movement.

[0057] One end of the spring 7 applies pressure to the stopper 9, and then transmits force through the connecting rod 4 to make the second roller 6 apply pressure toward the first body 1 to the second guide plate 5, and the second guide plate 5 transmits force to the first guide plate 3 through the mounting bracket 16 to apply pressure toward the first body 1. At the same time, the other end of the spring 7 applies pressure toward the second body to the first body 1, that is, applies pressure toward the second body to the first roller 2, and the first roller 2 and the two first guide plates 3 are pressed against each other to ensure that there is a certain positive pressure between the two, and the greater the positive pressure, the smoother the movement of the first body 1. When the driving device 14 drives the first roller 2 to rotate, friction is generated between the first roller 2 and the two first guide plates 3, so that the first roller 2 rolls on the two first guide plates 3, and the first body 1 makes a reciprocating linear motion along the first guide plate 3. When the first body 1 moves linearly, it drives the connecting rod 4 to move in the gap between the two first guide plates 3 and the gap between the two second guide plates 5, and the second roller 6 on the connecting rod 4 rolls on the second guide plate 5.

[0058] The reciprocating linear motion of the first body 1 is achieved by the first roller 2 rolling back and forth on two inclined first guide plates 3. The first guide plate 3 can be made very long to achieve long-distance linear motion, and the overall stability is high during long-distance linear motion. In other words, the device does not have a situation where the stability decreases with the increase of the linear motion distance.

[0059] The first main body 1 is also provided with one or more sets of clamping and releasing devices 8. In the ascent phase of the rocket, the clamping and releasing devices 8 press the first main body 1 against the satellite structure to ensure that the device can withstand the vibration load of the ascent phase. After entering orbit, the clamping and releasing devices 8 are unlocked and released without affecting the normal operation of the device.

[0060] The working process of the present invention is further described below:

[0061] First, the driving device 14 is started, and the output shaft 12 of the driving device 14 drives the transmission shaft 10 to rotate through the first gear 11 and the second gear 13. The rotation of the transmission shaft 10 drives the first roller 2 to roll on the two first guide plates 3 to drive the first body 1 to make a linear motion. The linear motion of the first body 1 drives the connecting rod 4 to move, and the connecting rod 4 drives the second roller 6 to roll on the two second guide plates 5. The direction of the output shaft 12 of the driving device 14 is changed to realize the reciprocating linear motion of the first body 1.

[0062] The linear motion device for weightless environment of the present invention can realize long-distance linear reciprocating motion of the target working load without relying on gravity, so it is very suitable for application in the aerospace field. The friction between the first roller 2 and the first guide plate 3 is used to realize long-distance motion, which has the advantages of smooth motion, no reliance on gravity, simple structure, low cost, easy installation and maintenance, small size, and large stroke. Moreover, the motion stroke is not limited, and under the condition of long-distance motion, complex transmission links are avoided, and it has the characteristics of simple structure and high reliability.

[0063] Multiple groups of clamping components and driving devices 14 can be provided on the first main body 1, thereby improving the movement reliability of the device. The first roller 2 of the present invention always keeps in contact with the first guide plate 3, ensuring the stability of the movement. The first guide plate 3 and the second guide plate 5 adopt an assembled design, which reduces the processing difficulty of the guide rail parts and facilitates installation and maintenance. In addition, the present invention is easy to implement the backup design of the driving device 14 and the clamping component, and has high reliability.

[0064] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A linear motion device for use in a weightless environment, characterized in that: include: A first body is rotatably connected to a first roller, wherein the first roller is rotated by a driving assembly; The second body is fixed with a linear guide assembly, the first roller is arranged on the linear guide assembly, and can roll along the linear guide assembly to drive the first body to perform linear motion; A clamping assembly, the two ends of which are respectively connected to the first body and the second body, and the clamping assembly is slidably connected to the second body, and the clamping assembly simultaneously generates pressures on the first body and the second body in opposite directions, so that pressure is generated between the first roller and the linear guide assembly, and when the first roller rotates, friction is generated by the pressure to make the first roller roll; The clamping assembly comprises: A connecting rod, the first end of which is passed through the first body and provided with a limiting portion, and the second end of which is slidably connected to the second body; an elastic member, disposed between the first body and the limiting portion, wherein one end of the elastic member applies pressure to the first body toward the second body; and the other end of the elastic member applies pressure to the limiting portion away from the second body, so that the second end of the connecting rod applies pressure to the second body toward the first body; The second body is provided with a second guide plate, the second end of the connecting rod is rotatably connected to a second roller, and the second roller is provided on an end surface of the second guide plate away from the first body; The first main body is provided with a receiving groove, the connecting rod is passed through the receiving groove, the elastic member is provided in the receiving groove and sleeved on the connecting rod, the limiting portion is located at one end of the receiving groove away from the second main body, one end of the elastic member is in conflict with one end surface of the receiving groove away from the limiting portion, and the other end is in conflict with the limiting portion.

2. The linear motion device for weightlessness environment according to claim 1, characterized in that: The linear guide assembly is two first guide plates arranged obliquely to each other, the first roller is arranged between the two first guide plates and contacts the sides of both of them at the same time, and the first roller rolls by generating friction with the sides of the two first guide plates.

3. The linear motion device for weightlessness environment according to claim 1, characterized in that: The limiting portion is a blocking cover, and the blocking cover is threadedly connected to the connecting rod.

4. The linear motion device for weightlessness environment according to claim 1, characterized in that: The drive assembly comprises: A transmission shaft, rotatably connected to the first body, the first roller is fixedly connected to the transmission shaft, and the transmission shaft is provided with a first gear; The driving device is arranged on the first main body, and the output shaft of the driving device is provided with a second gear, and the first gear is meshed with the second gear.

5. The linear motion device for weightlessness environment according to claim 2, characterized in that: The first guide plate is installed on the second body through an adjustment seat, the adjustment seat is provided with a first mounting surface and a second mounting surface inclined to each other, the first guide plate is provided on the first mounting surface, and the second mounting surface is provided on the second body.

6. The linear motion device for weightlessness environment according to claim 1, characterized in that: The elastic member is a spring.

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