Double-blade type elastic hot knife unlocking device

Abstract

The invention provides a double-blade type elastic hot knife unlocking device, and belongs to the technical field of satellite component unlocking. The device comprises a fixing plate, two hot knife assemblies are symmetrically arranged on the fixing plate, the hot knife assemblies are connected with the fixing plate through linear elastic structures, and a rope traction mechanism is further arranged between the two hot knife assemblies. The rope is wound around the hot knife parts on the two hot knife assemblies, the pre-tightened rope can compress the linear elastic structure so that the linear elastic structure can have elastic force perpendicular to the direction of the rope, the rope traction mechanism can gather the rope and pre-tighten the rope, and therefore a rope pre-tightening mechanism does not need to be additionally arranged on a satellite; the hot knife part generates high temperature, the elastic force of the linear elastic structure can drive the hot knife assembly to move upwards in the direction perpendicular to the rope so that the rope can be linearly cut through the hot knife part, the rope cutting path is short, and the cutting speed is high.

Description

Technical Field

[0001] The invention belongs to the technical field of unlocking components on a satellite, and relates to a double-blade elastic hot knife unlocking device. Background Art

[0002] On-board component unlocking devices are widely used in on-board component unlocking scenarios such as satellite orbital separation, on-board solar panels deployment, on-board antenna deployment, and on-board payload deployment. In the prior art, traditional unlocking devices mainly use pyrotechnics to achieve unlocking. For example, gunpowder ignition generates instantaneous high-pressure gas to break bolts and push split nuts, thereby achieving on-orbit unlocking of on-board components. However, traditional pyrotechnic unlocking devices have problems such as excessive impact caused by unlocking, high price, large volume occupied, and long delivery cycle;

[0003] The hot knife unlocking device is to melt the rope at high temperature to unlock the satellite components, which can solve the above problems. However, when the hot knife unlocking device in the prior art melts the rope, the rope is directly wrapped around the hot knife. After the position where the rope and the hot knife are in direct contact is melted, the part of the rope that is not in direct contact with the hot knife melts more slowly.

[0004] In order to overcome the shortcomings of the prior art, people have proposed various solutions through continuous exploration. For example, a Chinese patent discloses an elastic hot knife unlocking device [application number: 202110445463.9], including a hot knife, which is configured to heat up by powering on; a rope, which is used to connect the component to be unlocked with the fixing device of the satellite; and a hinge, which is used to make the hot knife and the rope in tight contact. The invention patent uses the elasticity of the hinge to melt at the position where the rope and the hot knife are in direct contact, and then the hot knife continues to be in contact with the remaining part through elastic force, so that the extension can be quickly cut off. However, when the hinge of the invention patent drives the hot knife to move, the hot knife rotates around the rotating shaft of the hinge, which makes the cutting path of the hot knife cutting the rope not a straight line, but a curved arc. When the rope is relatively thin, the time effect on the melting rope can be ignored, but when the rope is thick, the time effect on the melting rope will have a significant impact.

[0005] Therefore, the present application proposes an elastic hot knife unlocking device that utilizes elastic force to cut a rope in a straight line. Summary of the invention

[0006] The purpose of the present invention is to provide a double-blade elastic hot knife unlocking device in view of the above problems.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A double-blade elastic hot knife unlocking device comprises a fixed plate, on which two hot knife assemblies are symmetrically arranged, the hot knife assemblies are connected to the fixed plate through a linear elastic structure, and a rope traction mechanism is also arranged between the two hot knife assemblies. The hot knife assembly comprises a hot knife part and fixed ends arranged at both ends of the hot knife part, and the two fixed ends are respectively connected to metal wires connected to the hot knife part.

[0009] In the above-mentioned double-blade elastic hot knife unlocking device, the linear elastic structure includes two retractable arms respectively connected to two fixed ends, and two fixed seats corresponding to the retractable arms are fixedly connected to the fixed plate. The retractable arm is inserted into the telescopic slide groove in the fixed seat and a compression spring connected to the retractable arm is arranged in the telescopic slide groove.

[0010] In the above-mentioned double-blade elastic hot knife unlocking device, two limit slide grooves are symmetrically arranged on both sides of the telescopic slide groove, and limit sliding blocks inserted into the limit slide grooves are fixedly connected to both sides of the retractable arm.

[0011] In the above-mentioned double-blade elastic hot knife unlocking device, the rope traction mechanism includes a tightening sleeve with an opening and a lockable structure on the opening side. The tightening sleeve is made of elastic plastic material and also includes an inner pull tightening assembly connected to the tightening sleeve.

[0012] In the above-mentioned double-blade elastic hot knife unlocking device, the inner pull-type tightening assembly includes a linear driver having an output shaft parallel to the retracting arm and a tightening sleeve detachably fixed to the end of the output shaft.

[0013] In the above-mentioned double-blade elastic hot knife unlocking device, the lockable structure includes two locking parts protruding from the opening side of the contraction sleeve, and the two locking parts can be fixed by bolts.

[0014] In the above-mentioned double-blade elastic hot knife unlocking device, an anti-slip fixing structure is also provided between the fixed end and the hot knife part.

[0015] In the above-mentioned double-blade elastic hot knife unlocking device, the anti-slip fixing structure includes an inner end cover, a plug-in hole for the hot knife to pass through is arranged in the middle position of the inner end cover, and the inner end cover is arranged on the inner side of the fixed end.

[0016] In the above-mentioned double-blade elastic hot knife unlocking device, an outer groove body for filling the adhesive layer is arranged in the fixed end, and the adhesive layer is filled between the hot knife part and the fixed end. An inner groove body corresponding to the outer groove body is arranged in the inner end cover, and the outer end of the adhesive layer protrudes from the outer groove body and extends into the inner groove body to fix the inner end cover on the fixed end.

[0017] In the above-mentioned double-blade elastic hot knife unlocking device, the adhesive layer is made of high-temperature resistant insulating adhesive;

[0018] The inner end cover and the fixed end are made of insulating material;

[0019] The insulating material of the inner end cap and the fixed end is ceramic.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] 1. The rope is wound around the hot knife parts on the two hot knife assemblies. The pre-tightened rope can compress the linear elastic structure so that the linear elastic structure has an elastic force perpendicular to the direction of the rope. The rope traction mechanism can gather the rope and pre-tighten the rope, so there is no need to set up an additional rope pre-tightening mechanism on the star. When unlocking, the hot knife part generates high temperature. The elastic force of the linear elastic structure can drive the hot knife assembly to move upward in a direction perpendicular to the rope, so that the rope can be cut straightly by the hot knife part. The cutting path of the rope is short and the cutting speed is fast.

[0022] 2. After the rope is pre-tightened, the retractable arm can be moved toward the inside of the telescopic slide groove in the fixed seat to compress the compression spring. Therefore, when cutting the rope, the elastic force of the compression spring can be used to drive the retractable arm to move outward, so that the hot knife part and the part of the rope that is not in contact with the hot knife part can continue to be in contact, thereby completing the rapid cutting of the rope.

[0023] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 is a top view of the present invention;

[0026] Figure 3 is a cross-sectional view of the hot knife assembly.

[0027] In the figure, the hot knife part 1, the fixed end 2, the metal wire 3, the anti-slip fixing structure 4, the inner end cover 5, the plug hole 6, the adhesive layer 7, the outer trough body 8, the inner trough body 9, the fixing plate 10, the hot knife assembly 11, the linear elastic structure 12, the rope traction mechanism 13, the retractable arm 14, the fixing seat 15, the telescopic slide 16, the compression spring 17, the limit slide 18, the limit slider 19, the convergence sleeve 20, the linear drive 21, the locking part 22, and the bolt 23. DETAILED DESCRIPTION

[0028] like Figure 1-Figure 3As shown, a double-blade elastic hot knife unlocking device includes a fixed plate 10, on which two hot knife assemblies 11 are symmetrically arranged, and the hot knife assemblies 11 are connected to the fixed plate 10 through a linear elastic structure 12. A rope traction mechanism 13 is also arranged between the two hot knife assemblies 11. The hot knife assembly 11 includes a hot knife part 1 and fixed ends 2 arranged at both ends of the hot knife part 1, and the two fixed ends 2 are respectively connected with metal wires 3 connected to the hot knife part 1.

[0029] In the present invention, after the metal wire 3 is connected to the power supply, the hot knife part can be heated instantly and can be used to cut the rope of the on-board component to achieve unlocking; the rope is wound around the hot knife part 1 on the two hot knife assemblies 11, and the pre-tightened rope can compress the linear elastic structure 12 so that the linear elastic structure 12 has an elastic force perpendicular to the direction of the rope, and the rope traction mechanism 13 can gather the rope and pre-tighten the rope, so there is no need to set up an additional rope pre-tightening mechanism on the satellite, and when unlocking, the hot knife part 1 generates high temperature, and the elastic force of the linear elastic structure 12 can drive the hot knife assembly to move upward in a direction perpendicular to the rope, so that the rope can be cut linearly by the hot knife part, and the rope cutting path is short and the cutting speed is fast;

[0030] Secondly, providing two hot knife assemblies can increase fault tolerance. When one hot knife assembly fails to work, the other hot knife assembly can be used to complete the cutting of the rope.

[0031] Specifically, the linear elastic structure 12 includes two retractable arms 14 respectively connected to the two fixed ends 2, and two fixed seats 15 corresponding to the retractable arms 14 are fixedly connected to the fixed plate 10. The retractable arms 14 are inserted into the telescopic slots 16 in the fixed seats 15, and the telescopic slots 16 are provided with compression springs 17 connected to the retractable arms 14. After the rope is pre-tightened, the retractable arms can be moved into the telescopic slots in the fixed seats 15 to compress the compression springs. Therefore, when cutting the rope, the elastic force of the compression springs can be used to drive the retractable arms 14 to move outwards, so that the hot knife portion and the portion of the rope that is not in contact with the hot knife portion continue to be in contact, thereby completing the rapid cutting of the rope.

[0032] Specifically, two limiting slide grooves 18 are symmetrically arranged on both sides of the telescopic slide groove 16, and limiting sliders 19 inserted into the limiting slide grooves 18 are fixedly connected to both sides of the retractable arm 14. The limiting slide grooves cooperate with the limiting sliders to limit the retractable arm.

[0033] Specifically, the rope pulling mechanism 13 includes a tightening sleeve 20 with an opening and a lockable structure on the opening side, the tightening sleeve 20 is made of elastic plastic material, and also includes an inner pull-type tightening assembly connected to the tightening sleeve 20. After the rope passes through the two hot knife assemblies, the tightening sleeve 20 can tighten the rope to prevent the rope from being separated from the hot knife part, and secondly, the tightening sleeve 20 and the rope in the tightening sleeve can be driven downward by the inner pull-type tightening assembly to complete the pre-tightening of the rope.

[0034] Specifically, the inner pull tightening assembly includes a linear drive 21, which has an output shaft parallel to the retracting arm 14 and a tightening sleeve 20 detachably fixed to the end of the output shaft. The tightening sleeve can be driven downward by the linear drive to achieve pre-tightening of the rope.

[0035] Those skilled in the art should understand that the linear drive may be an oil cylinder, an air cylinder or a linear motor, etc.

[0036] Specifically, the lockable structure includes two locking portions 22 protruding from the opening side of the contraction sleeve 20 , and the two locking portions 22 can be fixed by bolts 23 .

[0037] Preferably, combined Figure 3 As shown, an anti-slipping fixing structure 4 is also provided between the fixed end 2 and the hot knife part 1. The anti-slipping fixing structure 4 is provided between the fixed end 2 and the hot knife part 1 to prevent the hot knife from loosening during operation, so as to ensure the unlocking effect.

[0038] Specifically, the anti-dropping fixing structure 4 includes an inner end cover 5, a plug hole 6 for the hot knife part 1 to pass through is arranged in the middle position of the inner end cover 5, and the inner end cover 5 is arranged on the inner side of the fixed end 2. After the hot knife part passes through the plug hole on the inner end cover and then the inner end cover is fixed to the fixed end, the hot knife part can be limited and fixed at the connection position with the fixed end to prevent the hot knife part from loosening.

[0039] Specifically, an outer groove body 8 for filling the adhesive layer 7 is provided in the fixed end 2, and the adhesive layer 7 is filled between the hot knife part 1 and the fixed end 2. An inner groove body 9 corresponding to the outer groove body 8 is provided in the inner end cover 5. The outer end of the adhesive layer 7 protrudes from the outer groove body 8 and extends into the inner groove body 9 to fix the inner end cover 5 on the fixed end 2.

[0040] Specifically, the adhesive layer 7 is made of high temperature resistant insulating adhesive; the inner end cover 5 and the fixed end 2 are made of insulating material; the insulating material used to make the inner end cover 5 and the fixed end 2 is ceramic.

[0041] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0042] Although this article uses the hot knife part 1, fixed end 2, metal wire 3, anti-slip fixing structure 4, inner end cover 5, plug hole 6, adhesive layer 7, outer trough 8, inner trough 9, fixed plate 10, hot knife assembly 11, linear elastic structure 12, rope traction mechanism 13, retractable arm 14, fixed seat 15, telescopic slide 16, compression spring 17, limit slide 18, limit slider 19, contraction sleeve 20, linear drive 21, locking part 22, bolt 23, etc. more frequently, these terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A double-blade elastic hot knife unlocking device, comprising a fixing plate (10), characterized in that: Two hot knife assemblies (11) are symmetrically arranged on the fixed plate (10); the hot knife assemblies (11) are connected to the fixed plate (10) via a linear elastic structure (12); a rope traction mechanism (13) is also arranged between the two hot knife assemblies (11); the hot knife assembly (11) comprises a hot knife part (1) and fixed ends (2) arranged at both ends of the hot knife part (1); the two fixed ends (2) are respectively connected to metal wires (3) connected to the hot knife part (1).

2. The double-blade elastic hot knife unlocking device according to claim 1, characterized in that: The linear elastic structure (12) comprises two retractable arms (14) respectively connected to two fixed ends (2); two fixed seats (15) corresponding to the retractable arms (14) are fixedly connected to the fixed plate (10); the retractable arms (14) are inserted into telescopic slide grooves (16) in the fixed seats (15); and a compression spring (17) connected to the retractable arms (14) is arranged in the telescopic slide grooves (16).

3. The double-blade elastic hot knife unlocking device according to claim 2, characterized in that: Two limiting slide grooves (18) are symmetrically arranged on both sides of the telescopic slide groove (16), and limiting sliding blocks (19) inserted into the limiting slide grooves (18) are fixedly connected to both sides of the retractable arm (14).

4. The double-blade elastic hot knife unlocking device according to claim 2, characterized in that: The rope pulling mechanism (13) comprises a tightening sleeve (20) having an opening and a lockable structure arranged on the opening side. The tightening sleeve (20) is made of elastic plastic material and also comprises an inner pull tightening assembly connected to the tightening sleeve (20).

5. The double-blade elastic hot knife unlocking device according to claim 4, characterized in that: The inner pull-type tightening assembly comprises a linear driver (21), the linear driver (21) having an output shaft parallel to the retracting arm (14), and a tightening sleeve (20) detachably fixed to the end of the output shaft.

6. The double-blade elastic hot knife unlocking device according to claim 4, characterized in that: The lockable structure comprises two locking parts (22) protruding from the opening side of the contraction sleeve (20), and the two locking parts (22) can be fixed by bolts (23).

7. The double-blade elastic hot knife unlocking device according to any one of claims 1 to 6, characterized in that: An anti-slip fixing structure (4) is also provided between the fixing end (2) and the hot knife portion (1).

8. The double-blade elastic hot knife unlocking device according to claim 7, characterized in that: The anti-slip fixing structure (4) comprises an inner end cover (5), a plug hole (6) for the heating knife (1) to pass through is arranged in the middle of the inner end cover (5), and the inner end cover (5) is arranged on the inner side of the fixing end (2).

9. The double-blade elastic hot knife unlocking device according to claim 8, characterized in that: An outer groove body (8) for filling the adhesive layer (7) is arranged inside the fixed end (2), and the adhesive layer (7) is filled between the hot knife portion (1) and the fixed end (2). An inner groove body (9) corresponding to the outer groove body (8) is arranged inside the inner end cover (5), and the outer end of the adhesive layer (7) protrudes from the outer groove body (8) and extends into the inner groove body (9) to fix the inner end cover (5) on the fixed end (2).

10. The double-blade elastic hot knife unlocking device according to claim 9, characterized in that: The adhesive layer (7) is made of high temperature resistant insulating adhesive; The inner end cover (5) and the fixed end (2) are made of insulating material; The insulating material used to make the inner end cover (5) and the fixed end (2) is ceramic.

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