CN112777004A

CN112777004A - High-reducing-ratio low-impact release mechanism for linear low-impact separation device

Info

Publication number: CN112777004A
Application number: CN202011181695.XA
Authority: CN
Inventors: 李咚咚; 王波; 丁锋; 刘立成; 田昀; 徐杰; 李媛媛; 叶耀坤; 李委托; 孙国鹏
Original assignee: Beijing Satellite Manufacturing Factory Co Ltd
Current assignee: Beijing Satellite Manufacturing Factory Co Ltd
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2021-05-11
Anticipated expiration: 2040-10-29
Also published as: WO2022089580A1; CN112777004B

Abstract

The present invention is a high reduction ratio low impact release mechanism for a wire-type low impact separation device, comprising: the device comprises a base 17, an upper cover 4, a connecting and separating assembly, a locking and unlocking assembly, an electromagnetic driving assembly and a pawl assembly; the mechanism works in three states, which are respectively: a connection and locking state, an unlocking and separating state and a reset state; (1) in the connection and locking state, the connection and separation assembly reduces the elastic pretightening force and transmits the elastic pretightening force to the locking and unlocking assembly, and the locking and unlocking assembly further reduces the reduced elastic pretightening force and transmits the reduced elastic pretightening force to the electromagnetic driving assembly; the electromagnetic driving component is used for keeping the further reduced elastic pretightening force, so that the bag belt is locked; (2) in the unlocking and separating state, the locking and unlocking assembly rotates to unlock the connecting and separating assembly, so that the elastic pre-tightening force of the wrapping tape is released. (3) After the unlocking and the separation are finished, the mechanism is restored to the connection and locking state.

Description

High-reducing-ratio low-impact release mechanism for linear low-impact separation device

Technical Field

The invention relates to a large-reducing-ratio low-impact release mechanism for a linear low-impact separation device, belonging to the technical field of low-impact linear separation devices of rockets, satellites or airships.

Background

At present, an explosive device is mainly used for unlocking and releasing a spacecraft satellite-rocket separation system, and a typical satellite-rocket separation structure comprises a belt-wrapping type separation structure, a point type separation structure and the like. Most of the explosion energy of the point type separation structure is transmitted to the spacecraft structures on two sides, and the high-frequency high-amplitude stress wave can cause fatal damage to the payload of the spacecraft. In the separation process of the belted separation structure, because the belted falls off, the energy dissipation is large, the residual energy is small, and the impact on the spacecraft is small. And because the belted separating structure has the characteristics of large bearing capacity, high rigidity and high reliability, the belted separating structure is widely applied to the separation of effective loads such as stars and arrows at home and abroad.

The belting formula isolating construction adopts traditional initiating explosive device to realize the connection and locking of belting mostly, makes whole simple structure compact, the reliability is high, specific energy is big, actuates fastly. However, the traditional initiating explosive device also has the defects of large impact, obvious additional pollution, unrepeatability, non-testability, high test cost and the like, and the application of the belted separation structure in high-precision and low-impact separation tasks is limited.

Disclosure of Invention

The technical problem solved by the invention is as follows: the shortcomings of the prior art are overcome, a large-reduction-ratio low-impact release mechanism for a linear low-impact separation device is provided, the locking and low-impact separation of the linear separation device with large bearing capacity are realized, and the mechanism has the characteristics of high reliability, repeatability, testability and the like.

The technical scheme of the invention is as follows: a high reduction force, low impact release mechanism for a wire-type low impact separation device, comprising: the device comprises a base (17), an upper cover (4), a connecting and separating assembly, a locking and unlocking assembly, an electromagnetic driving assembly and a pawl assembly;

the connecting and separating assembly and the locking and unlocking assembly are fixed on the base (17), the electromagnetic driving assembly is fixed on the base (17), and the pawl assembly is installed on the base (17); the upper cover (4) and the base (17) can be installed in a matching way;

the mechanism works in three states, which are respectively: a connection and locking state, an unlocking and separating state and a mechanism resetting state;

in the connection and locking state, the electromagnetic driving assembly limits the locking and unlocking assembly, the locking and unlocking assembly locks the connection and separation assembly, and the connection and separation assembly can be connected with the bag belt to enable the bag belt to generate elastic pre-tightening force;

the connecting and separating assembly reduces the elastic pretightening force and transmits the elastic pretightening force to the locking and unlocking assembly, and the locking and unlocking assembly reduces the reduced elastic pretightening force again and then transmits the elastic pretightening force to the electromagnetic driving assembly; the electromagnetic driving component keeps the elastic pretightening force after being reduced again, so that the bag belt is locked;

in the unlocking and separating state, after the electromagnetic driving assembly receives an external unlocking instruction, the limit of the locking and unlocking assembly is released, the locking and unlocking assembly rotates, the locking of the connecting and separating assembly is released, and the elastic pre-tightening force of the wrapping tape is released;

after the unlocking and the separation are completed, according to the repeated use requirement, the mechanism enters a reset state, and the locking and unlocking assembly and the electromagnetic driving assembly are reset and the connecting and separating assembly are sequentially connected, so that the mechanism is restored to the connecting and locking state.

Preferably, the connecting and separating assembly is composed of a left pre-tightening rod 1, a pre-tightening nut 2, a ball pad 3, a left bearing cover 5, a ratchet wheel disc 6, a spring wire positioning ring 7, a polytetrafluoroethylene ring 8, a flywheel seat 9, a stop pin 10, a torsion spring wire 11, a needle bearing 12, a thrust needle bearing 13, a flywheel nut 14, a base 15, a right bearing cover 16, a right pre-tightening rod 18 and the like, as shown in fig. 3. The left pre-tightening rod 1 comprises a small hexagonal section 1A, a cylindrical section 1B, a large hexagonal section 1C and a left-handed trapezoidal thread section 1D, as shown in FIG. 11. The flywheel housing 9 includes a small post segment 9A, a large post segment 9B, a stopper pin mounting groove 9C, a needle bearing mounting hole 9D, a thrust needle bearing mounting face 9E, and a flange segment 9F, as shown in fig. 12. The right pretensioning lever 18 comprises a small hexagonal section 18A, a cylindrical section 18B, a large hexagonal section 18C and a right-handed trapezoidal thread section 18D, as shown in fig. 13. The center of the ball pad 3 is a through hole, and the diameter of the through hole is larger than the diameter of the cylindrical sections of the left pre-tightening rod 1 and the right pre-tightening rod 18. The freewheel nut 14 includes a central rotational axis 14A, a left-handed trapezoidal thread segment 14B, a right-handed trapezoidal thread segment 14C, an intermediate cylindrical segment 14D and a retaining pin mounting slot 14E, as shown in FIG. 14. The assembly is one of key components of a mechanism for realizing large load bearing and low impact. When the assembly is locked, the left-handed trapezoidal thread section 14B and the right-handed trapezoidal thread section 14C on the locked flywheel nut 14 are connected with the left-handed trapezoidal thread section 1D of the left pre-tightening rod 1 and the right-handed trapezoidal thread section 2D of the right pre-tightening rod 18, and the pre-tightening force of the wrapping tape is loaded through the pre-tightening nut 2 and the ball pad 3. During unlocking, the flywheel nut 14 rotates at a high speed under the action of pretightening force to push out the pretightening rods (the left pretightening rod 1 and the right pretightening rod 18) at the two ends, so that the quick unlocking and separation of the wrapping tape are realized.

Two needle roller bearings 12 are respectively arranged between the flywheel seat 9 and the central rotating shaft 14A of the flywheel nut 14, and between the base 15 and the central rotating shaft 14A of the flywheel nut 14. Two thrust needle roller bearings 13 are respectively arranged between the flywheel seat 9 and the middle cylindrical section 14D of the flywheel nut 14, and between the base 15 and the middle cylindrical section 14D of the flywheel nut 14. Two ends of the central rotating shaft 14A of the flywheel nut 14 penetrate through the inner hole of the needle bearing 12 to realize radial support. And the end surfaces of two sides of the middle cylindrical section 14D of the fly wheel nut 14 are attached to the thrust needle roller bearing 13, so that the axial positioning of the fly wheel nut 14 is realized. The left bearing cover 5 and the right bearing cover 16 are arranged on the end faces of the flywheel seat 9 and the base 15 and limit the axial movement of the two needle roller bearings 12. The assembly comprises 4 stop pins 10, and a large column section 9B of the flywheel seat 9 and a middle column section 14D of the flywheel nut 14 are matched with the stop

pin mounting grooves

9C and 14E in four quadrant positions. When the retaining pin 10 is in the retaining

pin mounting slots

9C and 14E of the freewheel seat 9 and the freewheel nut 14, the rotational freedom of the freewheel nut 14 is limited and cannot rotate. The ratchet wheel plate 6, the spring wire positioning ring 7 and the polytetrafluoroethylene ring 8 are arranged on the flywheel seat, and axial limiting is achieved through the left bearing cover 5. The ratchet wheel disc 6 and the spring wire positioning ring 7 are fixedly connected through screws. And a connector at one end of the torsion spring wire 11 is fixedly connected with the spring wire positioning ring 7, and the other end of the torsion spring wire realizes physical limiting through a spring wire arm 20. At the initial position, after one end of the torsion spring wire 11 is limited by the spring wire arm 20, the ratchet wheel disc 6 rotates anticlockwise (when viewed from the left pre-tightening rod 1 to the upper cover 4), the spring wire positioning ring 7 is driven to rotate, and therefore the torsion spring wire 11 tightly holds the flywheel base 9, and the stop pin 10 is limited. The connecting section of the left pre-tightening rod 1 and the flywheel nut 14 is provided with left-handed multi-head

trapezoidal threads

1D and 14B, and the connecting section of the right pre-tightening rod 18 and the flywheel nut 14 is provided with right-handed multi-head

trapezoidal threads

18D and 14C. Matched threads are machined on the parts, connected with the pre-tightening nuts 2, of the left pre-tightening rod 1 and the right pre-tightening rod 18, and loading of pre-tightening force is achieved. The hexagonal cooperation has all been designed to left pretension pole 1 and left bearing cap 5 cooperation department to and right pretension pole and the cooperation department of right bearing cap 16, and when flywheel nut rotated, left pretension pole 1 and right pretension pole 18 had been restricted by left bearing cap 5 and bearing cap 16 respectively and had rotated, can only follow axial and insert or release.

The connecting and separating assembly is fastened and connected with the base 17 through screws uniformly distributed along the circumference on the base 15.

Preferably, the locking and unlocking assembly is comprised of a wire flapper shaft 19, a wire flapper 20, a flapper torsion spring 21 and a flapper torsion spring sleeve 22, as shown in fig. 4. The function of the assembly is to achieve reliable locking and unlocking of the connecting and separating assembly, and to enable manual resetting after unlocking.

When the locking device is locked, the spring wire baffle plate 20 limits one end of the torsion spring wire 11, so that the torsion spring wire 11 can reliably limit the stop pin 10 in the stop

pin mounting grooves

9C and 14E of the flywheel seat 9 and the flywheel nut 14 after the ratchet wheel plate is reset, and the limit of the flywheel nut 14 is realized. At this time, the lever effect of the spring wire damper 20 reduces the locking force to the end of the torsion spring wire 11, achieving a reliable lock. During unlocking, the electromagnetic driving assembly is triggered to release the limit of the spring wire baffle 20, the spring wire baffle rotates under the thrust action of the end portion of the torsion spring wire 11, then the end portion of the torsion spring wire 11 is separated, the shape is rapidly recovered, the radial limit of the stop pin 10 is released, the stop pin 10 is extruded out of the stop pin mounting groove 14E by the thrust of the flywheel nut 14, the flywheel nut 14 rotates under the action of pretightening force, and the left pretightening rod 1 and the right pretightening rod 18 are pushed out through spiral transmission to realize separation. When the electromagnetic driving assembly is reset, the stop lever of the electromagnetic driving assembly is firstly electrified to be retracted, then the spring wire baffle 20 is manually rotated anticlockwise (seen from the spring wire baffle shaft 19 to the direction of the spring wire baffle 20) to a locking position, and then the electromagnetic driving assembly is powered off to enable the stop lever to be pushed out, so that the spring wire baffle 20 is limited.

The spring wire baffle shaft 19 penetrates through the spring wire baffle 20, the baffle torsional spring 21 and the baffle torsional spring sleeve 22 in sequence, and then is connected with the base 17 through threads at the end part.

Preferably, the electromagnetic drive assembly is composed of a spring gland 30, a return spring 31, a spring end cap 32, an electromagnetic actuator mounting plate 33, an electromagnetic actuator 34 and an electrical connector 35, as shown in fig. 5. The function of the assembly is to realize reliable locking and unlocking of the locking and unlocking assembly, and is a driving source for unlocking and triggering of the whole mechanism.

The assembly is designed to be in a power-off locked, power-on triggered operating state. When the power is cut off, the stop lever of the electromagnetic actuator 34 extends out under the pushing of the return spring 31 to stop the spring wire baffle 20, so that the reliable locking of the locking and unlocking assembly is realized. After the power is switched on, the stop lever of the electromagnetic actuator 34 overcomes the thrust of the reset spring 31 and the friction force of the spring wire baffle plate 20, retracts into the electromagnetic actuator, relieves the limit of the spring wire baffle plate 20, and realizes the unlocking of the locking and unlocking assembly.

The electromagnetic actuator 34 is connected with the electromagnetic actuating mounting plate 33 through a nut, a spring end cover 32 and a return spring 31 are mounted at the tail of a stop lever of the electromagnetic actuator 34, the spring gland 30 is connected with the electromagnetic actuating mounting plate 33 through threads, the return spring 31 is in a compressed state, the stop lever is pushed out until the spring end cover 32 is attached to the electromagnetic actuating mounting plate 33, and at the moment, the stop lever is in a position for limiting the spring wire baffle plate 20. The electric connector 35 penetrates the electromagnetic actuator mounting plate 33 from the inside and is fixed by screw connection. The cable of the electromagnetic actuator 34 is connected to the electrical connector 35 and the entire assembly is then secured to the base 17 by the electromagnetic actuating mounting plate 33.

Preferably, the pawl assembly is comprised of a pawl shaft 23, a friction reducing pad 24, a pawl 25, a pawl torsion spring 26, a friction reducing ring 27, a limit post 28 and a pawl mounting plate 29 as shown in fig. 6. The function of the assembly is to cooperate with the ratchet plate 6 to effect the mechanical reset.

After the whole mechanism is unlocked, the spring wire baffle 20 and the stop lever of the electromagnetic actuator 34 are reset to the right, and the left pre-tightening rod 1 and the right pre-tightening rod 18 are pushed into the flywheel nut 14 to realize threaded connection. And then the four stop pins 10 are placed in the stop pin mounting grooves 9C of the quadrants of the flywheel seat 9. Anticlockwise (from the pole of tightening left in advance 1 toward upper cover 4 direction) rotatory ratchet dish 6, the one end rotation of torsion spring 11 is drawn to spring holding ring 7, after the other end of torsion spring 11 is caught and spacing by spring baffle 20, the whole unable rotation of torsion spring 11, and the one end of connecting on ratchet dish 6 is along with ratchet dish 6 constantly rotatory, make torsion spring 11 hold tightly on flywheel seat 9 big column section 9B, restrict stop pin 10 in the stop

pin mounting groove

14E and 9C of flywheel nut 14 and flywheel seat 9, realize that the device resets.

The pawl shaft 23 penetrates through the antifriction pad 24, the pawl 25, the pawl torsion spring 26 and the antifriction ring 27 in sequence, and then is screwed on the pawl mounting plate 29. The pawl torsion spring 26 is connected at one end to the pawl 25 and at the other end to the pawl mounting plate 29 to ensure that the pawl 25 is always pressed against the ratchet plate 6. The limit post 28 is screwed on the pawl mounting plate 29 to limit the pawl 25. The entire assembly is mounted on the base 17 by means of the pawl mounting plate 29.

Compared with the prior art, the invention has the advantages that:

(1) the connecting and separating functions of the mechanism are mainly realized by connecting the flywheel nut with the trapezoidal threads of the left pre-tightening rod and the right pre-tightening rod. The two ends of the central rotating shaft of the flywheel nut are provided with multi-head non-self-locking trapezoidal threads with opposite rotation directions, and the left pre-tightening rod and the right pre-tightening rod are also provided with multi-head non-self-locking trapezoidal threads matched with the left pre-tightening rod and the right pre-tightening rod. By optimizing parameters such as the tooth form and the fit tolerance of the trapezoidal thread, the reliable connection and separation of the mechanism are realized.

(2) In the invention, the mechanism needs to provide a pretightening force not less than 60KN in a connection state, and the force reducing design is carried out on the mechanism in order to reduce the power consumption of a mechanism product and improve the reliability. The first-stage force reduction realizes the locking of the flywheel nut through the stop pin, and the lever principle is applied to realize about 30 times of force reduction. The secondary force reduction realizes the locking of the stop pin by winding the stop pin by a torsion spring wire, and about 55 times of force reduction is realized by applying the Euler principle. The three-stage force reduction realizes the locking of the torsion spring wire through the spring wire baffle, and 2 times of force reduction is realized by applying a lever principle. Through the force reducing designs, low power consumption of the product is achieved, and the reliability of the product is improved.

(3) The mechanism of the invention adopts non-self-locking multi-start trapezoidal threads to realize the application and release of pre-tightening force. When the mechanism is unlocked, the flywheel nut starts to rotate after constraint of the flywheel nut is removed, the left pre-tightening rod and the right pre-tightening rod are driven to be separated, elastic potential energy stored during pre-tightening is converted into kinetic energy of the flywheel nut and the left and right pre-tightening rods, pre-tightening force is gradually released, and unlocking impact is reduced. Meanwhile, as the whole device is designed to reduce force, the trigger mechanism can realize triggering in a non-flame mode, and the impact of the product is further reduced;

(4) the trigger mechanism is driven by non-fire (electromagnetic drive), and after a product is triggered, the trigger mechanism is reset through the reset tool, so that the trigger mechanism can be reused. In specific implementation, the trigger mechanism can also be driven by non-firer such as memory alloy or paraffin according to actual use conditions. Meanwhile, the reset function after triggering is considered in the design of each stage of the three-stage force reducing mechanism (for example, a ratchet wheel assembly is arranged on a flywheel seat of the two-stage force reducing mechanism to realize the reusability of the connecting and separating mechanism), so that the reusability and testability functions of the whole mechanism are realized;

(5) the invention relates to a high-reducing-ratio low-impact release mechanism for a linear low-impact separation device, which can be applied to a low-impact linear separation device of a rocket, a satellite or an airship and realizes reliable separation and release of the satellite and the rocket or other effective loads.

Drawings

Fig. 1 is an exploded view of the overall structure of the mechanism of the present invention.

Fig. 2 is an assembly schematic of the mechanism of the present invention.

Fig. 3 is a sectional view of the connecting and disconnecting module of the present invention.

Fig. 4 is a cross-sectional view of the locking and unlocking assembly of the present invention.

Fig. 5 is a cross-sectional view of an electromagnetic drive assembly of the present invention.

Fig. 6 is a cross-sectional view of the pawl assembly of the present invention.

Fig. 7 is a first schematic view of the locked state of the present invention.

Fig. 8 is a second schematic view of the locked state of the present invention.

Fig. 9 is a first schematic view of the unlocked state of the present invention.

Fig. 10 is a second schematic view of the unlocked state of the present invention.

FIG. 11 is a schematic view of the left pre-tightening rod of the present invention

FIG. 12 is a schematic view of a flywheel seat of the present invention

FIG. 13 is a schematic view of the right preload bar of the present invention

FIG. 14 is a schematic view of a fly wheel nut of the present invention

FIG. 15 is a schematic view of the left bearing cap of the present invention

FIG. 16 is a schematic view of a torsion spring wire according to the present invention

FIG. 17 is a schematic view of the right bearing cap of the present invention

FIG. 18 is a schematic view of a spring wire baffle of the present invention

FIG. 19 is a schematic view of a pawl according to the present invention

FIG. 20 is a schematic view of a base according to the present invention

FIG. 21 is a force diagram of the main components of the connection and disconnection assembly of the present invention

Detailed Description

The invention is described in further detail below with reference to the figures and specific embodiments.

The present invention is a high reduction ratio low impact release mechanism for a wire-type low impact separation device, comprising: the device comprises a base 17, an upper cover 4, a connecting and separating assembly, a locking and unlocking assembly, an electromagnetic driving assembly and a pawl assembly; the mechanism works in three states, which are respectively: a connection and locking state, an unlocking and separating state and a reset state; (1) in the connection and locking state, the electromagnetic driving assembly limits the locking and unlocking assembly, the locking and unlocking assembly locks the connection and separation assembly, and the connection and separation assembly can be connected with the bag belt to enable the bag belt to generate elastic pre-tightening force; the connecting and separating assembly reduces the elastic pretightening force and transmits the reduced elastic pretightening force to the locking and unlocking assembly, and the locking and unlocking assembly further reduces the reduced elastic pretightening force and transmits the reduced elastic pretightening force to the electromagnetic driving assembly; the electromagnetic driving component is used for keeping the further reduced elastic pretightening force, so that the bag belt is locked; (2) in the unlocking and separating state, after the electromagnetic driving assembly receives an external unlocking instruction, the limit of the locking and unlocking assembly is released, the locking and unlocking assembly rotates, the locking of the connecting and separating assembly is released, and the elastic pre-tightening force of the wrapping tape is released. (3) After the unlocking and the separation are completed, according to the repeated use requirement, the mechanism enters a reset state, and the locking and unlocking assembly and the electromagnetic driving assembly are reset and the connecting and separating assembly are sequentially connected, so that the mechanism is restored to the connecting and locking state.

Currently, with the continuous development of spacecraft miniaturization, instruments and equipment on a spacecraft are closer to an impact source, and the impact problem caused by the release of traditional initiating explosive devices is particularly prominent. Meanwhile, in future major tasks such as on-orbit service and construction in China, satellite arrows and effective loads have common requirements on low-impact separation. Therefore, a novel linear low-impact separation device of a wrapping belt separation structure for replacing the traditional initiating explosive device for connecting and unlocking becomes a hotspot of research of people in aerospace engineering. The invention develops a large-reducing-ratio low-impact release mechanism for a belting connecting structure aiming at the characteristics of a linear low-impact separation device, and meets the application requirements of non-fire work, low impact, high reliability, reusability, testability and the like.

In the mechanism of the present invention, the connection object is a taping assembly. When the star body is connected with a rocket or a payload is connected with a carrying end, one or more groups of belt components are connected into a complete annular belt through the left pre-tightening rod, the right pre-tightening rod, the ball pad and the pre-tightening nut, and pre-tightening force is applied. At this time, the V-shaped horizontal groove clamp blocks on the strap assembly fix two annular mating flanges (one flange is part of the launch vehicle structure and the other flange is part of the satellite or payload structure) together, achieving a reliable connection.

When satellite and rocket separation or payload separation is required, the mechanism is unlocked, the pre-tightening force applied to the belt assembly is released, the belt assembly is opened, the V-shaped horizontal groove clamping block is separated from the annular matching flange, and the star or payload can be released under the action of the separating spring force. A (c) is,

Preferred specifications for the components in the coupling and decoupling assembly are as follows:

the left pre-tightening rod 1 has the preferable scheme that: comprises a small hexagonal section 1A, a cylindrical section 1B, a large hexagonal section 1C and a left-handed trapezoidal thread section 1D, as shown in figure 11. The small hexagonal section 1A, the cylindrical section 1B, the large hexagonal section 1C and the left-handed trapezoidal thread section 1D are sequentially connected; the diameter of the outer envelope of the small hexagonal section 1A is smaller than that of the cylindrical section 1B, the diameter of the cylindrical section 1B is smaller than that of the outer envelope of the large hexagonal section 1C, and the diameter of the outer envelope of the large hexagonal section 1C is larger than that of the left-handed trapezoidal thread section 1D. The small hexagonal section 1A is used for adhering a strain gauge and fixing a pre-tightening rod when a pre-tightening nut is screwed down; the cylindrical section 1B is provided with external threads which are matched with the pre-tightening nut 2, so that the pre-tightening nut 2 can move on the cylindrical section 1B along the axial direction, and the ball pad 3 can tightly press the belting head to enable the belting to generate pre-tightening force; big hexagonal section 1C wears in left bearing cap 5 when locking state, cooperates with the hexagonal hole on the left bearing cap 5, and when the unblock, this hexagonal cooperation has restricted the rotation of left pretension pole 1, makes left pretension pole 1 can only move along the axis, separates with flywheel nut 14, realizes the band pretightning force and releases. The left-hand trapezoidal thread section 1D is in multi-head non-self-locking trapezoidal thread connection with the left-hand trapezoidal thread section 14B of the flywheel nut 14. The left pre-tightening rod 1 is made of high-strength stainless steel, the mechanical property of the part is improved through heat treatment, meanwhile, solid lubrication treatment is carried out on the surface of the part, the triggering power consumption of the mechanism is reduced, and the unlocking reliability of the mechanism is improved.

The ball pad 3, the preferred scheme is specifically: the diameter of the central through hole is larger than that of the cylindrical sections of the left pre-tightening rod 1 and the right pre-tightening rod 18.

The left bearing cover 5 specifically comprises: comprises a base body 5A, an inner hexagonal hole 5B, a lower end spigot 5C and an upper end spigot 5D, as shown in figure 15. The center of the base body 5A is provided with an inner hexagonal hole 5B, and a lower end seam allowance 5C and an upper end seam allowance 5D are connected to one side of the large flange face of the base body. The inner hexagonal hole 5B is used for being matched with a large hexagonal section 1C of the left pre-tightening rod 1, and when the mechanism is unlocked, the rotation of the left pre-tightening rod 1 is limited, so that the left pre-tightening rod 1 can only move along the axis and is separated from the flywheel nut 14, and the tightening force release of the wrapping belt is realized. The lower end spigot 5C is used for axially positioning the needle bearing 12, and the upper end spigot 5D is used for axially positioning the ratchet wheel disc 6, the spring wire positioning ring 7 and the polytetrafluoroethylene ring 8.

The left bearing cover 5 is made of high-strength stainless steel, the hardness of parts is improved through heat treatment, and meanwhile 6 surfaces of the inner hexagonal hole 5B are lubricated, so that the friction resistance between the left pre-tightening rod 1 and the left pre-tightening rod is reduced.

The ratchet wheel plate 6 preferably comprises: comprises 36 ratchets on the outer ring, a central through hole and 4 countersunk mounting holes, as shown in figures 1 and 2. The diameter of the central through hole is larger than that of the middle post section 9A of the flywheel seat 9, and the central through hole is in small clearance fit, so that the ratchet wheel plate 6 can flexibly rotate on the flywheel seat 9 and can be reliably locked by the pawl. The 36 ratchets on the outer ring are matched with the pawls 25 in the ratchet assembly, so that the ratchet wheel disc 6 can only rotate in one direction, and the pre-tightening of the torsion spring wire 11 is realized.

The preferred scheme of the spring wire positioning ring 7 is as follows: the screw-thread cutting machine comprises a circular ring, wherein four threaded holes are axially formed in the circular ring, and a through hole is formed in the surface of the circular ring. The diameter of the central hole of the circular ring is larger than that of the middle column section 9A of the flywheel seat 9, and the circular ring is in small clearance fit, so that the spring positioning ring 7 can flexibly rotate on the flywheel seat 9. The four threaded holes are used for connecting the ratchet wheel disc, and the through holes of the ring surface are used for connecting the ends of the torsion spring wires, as shown in figure 3.

The preferable scheme of the polytetrafluoroethylene ring 8 is as follows: comprising a circular ring of polytetrafluoroethylene material. The diameter of the central hole of the circular ring is larger than that of the middle and small column sections 9A of the flywheel seat 9, and the circular ring is in small clearance fit and is convenient for part installation. This feature is used to adjust the axial positioning of the left bearing cap 5, ratchet plate 6 and spring retaining ring 7 and to reduce the friction during their relative rotation, facilitating the resetting operation.

The preferred scheme of the flywheel seat 9 is as follows: including a small column section 9A, a large column section 9B, a stopper pin mounting groove 9C, a needle bearing mounting hole 9D, a thrust needle bearing mounting face 9E, and a flange section 9F, as shown in fig. 12. The small column section 9A, the large column section 9B and the flange section 9F are connected in sequence. The outer diameter of the large column section 9B is matched with the depth of the stop pin mounting groove 9C of the flywheel nut 14, so that the stop pin 10 is not higher than the outer surface of the large column section 9B of the flywheel base 9 in the locking state, and the stress of the torsion spring wire 11 in the locking state is good, as shown in FIG. 8.

The stop pin 10, the preferred scheme is specifically: comprising a cylindrical section. The material is high-strength alloy steel, the mechanical property of the part is improved through heat treatment, and meanwhile, the surface of the part is subjected to solid lubrication treatment, so that the friction resistance during unlocking is reduced, and the reliability of mechanism unlocking is improved.

The preferred scheme of the torsion spring wire 11 is as follows: including a winding section 11A, an inner joint 11B and an outer joint 11C, as shown in fig. 16. The inner joint 11B, the winding section 11A, and the outer joint 11C are connected in this order. The winding section 11A is arranged on the outer surface of a large cylindrical section 9B of the flywheel seat 11, the inner joint 11B is inserted into a ring surface through hole of the spring positioning ring 7, and the outer joint 11C is blocked by the spring arm 20 when the mechanism is in a locking state.

The torsion spring wire 11 is made of a spring steel wire, and the shape stability of the torsion spring wire 11 in an initial state is ensured through processes such as heat treatment and the like. The diameter of the section of the steel wire of the torsion spring wire 11 is a dozen of times of the middle diameter of the torsion spring wire 11, and the whole structure is similar to a torsion spring. The inner diameter value of the torsion spring wire 11 in the initial state is larger than the maximum outer envelope value required by the movement of the stop pin 10 after the mechanism is unlocked, so that the mechanism can be reliably unlocked.

The flywheel nut 14 preferably comprises: including a central rotating shaft 14A, a left-handed trapezoidal thread segment 14B, a right-handed trapezoidal thread segment 14C, an intermediate cylindrical segment 14D, and a retaining pin mounting groove 14E, as shown in fig. 14. The outer diameter of the central rotating shaft 14A is smaller than the inner diameter of the needle bearing 12, and is in small clearance fit; the outer diameter of the middle cylindrical section 14D is smaller than the inner diameter of the large cylindrical section 9B of the flywheel seat 9, and the middle cylindrical section is in large clearance fit. The width of the retaining pin mounting groove 14E is greater than the diameter of the retaining pin 10 and is a large clearance fit. When the mechanism is in a locking state, the stop pin 10 is respectively contacted with one surface of the stop pin mounting groove 14E of the flywheel nut 14 and one surface of the stop pin mounting groove 9C of the flywheel seat 9, the rotation of the flywheel nut 14 is limited, and the application of pre-tightening force is realized.

The right bearing cover 16 preferably includes: comprises a base body 16A, an inner hexagonal hole 16B and a spigot 16C, as shown in figure 17. The center of the base body 16A is provided with an inner hexagonal hole 16B, and the spigot 5C is connected to one side of the large flange surface of the base body. The inner hexagonal hole 16B is used for being matched with a large hexagonal section 18C of the right pre-tightening rod 18, when the mechanism is unlocked, the rotation of the right pre-tightening rod 18 is limited, the right pre-tightening rod 18 can only move along the axis and is separated from the flywheel nut 14, and the wrapping tape pre-tightening force is released. The spigot 16C serves for axial positioning of the needle bearing 12.

The right bearing cover 16 is made of high-strength stainless steel, the hardness of parts is improved through heat treatment, and meanwhile 6 surfaces of the inner hexagonal hole 5B are lubricated, so that the friction resistance between the right pre-tightening rod 18 and the right pre-tightening rod is reduced.

The right pre-tightening rod 18 is preferably: including a small hexagonal section 18A, a cylindrical section 18B, a large hexagonal section 18C and a right-handed trapezoidal thread section 18D, as shown in fig. 13. The small hexagonal section 18A, the cylindrical section 18B, the large hexagonal section 18C and the right-handed trapezoidal thread section 18D are sequentially connected; the diameter of the outer envelope of the small hexagonal section 18A is smaller than that of the cylindrical section 18B, the diameter of the cylindrical section 18B is smaller than that of the outer envelope of the large hexagonal section 18C, and the diameter of the outer envelope of the large hexagonal section 18C is larger than that of the right-handed trapezoidal thread section 18D. The small hexagonal section 18A is used for adhering a strain gauge and fixing a pre-tightening rod when a pre-tightening nut is screwed down; the cylindrical section 18B is provided with external threads and is matched with the pre-tightening nut 2, so that the pre-tightening nut 2 can move on the cylindrical section 18B along the axial direction, and the ball pad 3 can tightly press the belting head to enable the belting to generate pre-tightening force; the large hexagonal section 18C penetrates through the right bearing cover 16 in a locking state and is matched with a hexagonal hole in the right bearing cover 16, and when the large hexagonal section is unlocked, the hexagonal matching limits the rotation of the right pre-tightening rod 18, so that the right pre-tightening rod 18 can only move along the axis and is separated from the flywheel nut 14, and the releasing of the wrapping tape pre-tightening force is realized. The right-handed trapezoidal thread section 18D is in multi-start non-self-locking trapezoidal thread connection with the right-handed trapezoidal thread section 14C of the freewheel nut 14.

The right pre-tightening rod 18 is made of high-strength alloy steel, the mechanical property of the part is improved through heat treatment, meanwhile, solid lubrication treatment is carried out on the surface of the part, the triggering power consumption of the mechanism is reduced, and the unlocking reliability of the mechanism is improved.

In the locking and unlocking assembly, the preferred specific requirements for each component are as follows:

the preferred scheme of the spring wire baffle 20 is as follows: including a base 20A, a stop lever section 20B, and a U-shaped channel 20C, as shown in fig. 18. The center of the base body 20A is provided with a through hole, the diameter of which is larger than that of the spring wire baffle shaft 19 and is in small clearance fit. Meanwhile, a small hole is formed beside the central through hole and used for being connected with one end of the baffle torsional spring. The stop rod section 20B is used for cooperating with the electromagnetic driving assembly to realize the locking and unlocking functions of the locking and unlocking assembly. The U-shaped groove 20C is used for limiting the external joint 11C of the torsion spring wire 11, and the U-shaped structure is used for enabling the external joint 11C of the torsion spring wire 11 to be collected into the groove when the mechanism is reset and is reliable in limiting. The locked state is shown in fig. 7.

The preferable scheme of the baffle plate torsion spring sleeve 22 is as follows: comprising a circular ring of brass material. The diameter of the central hole of the circular ring is larger than that of the spring wire baffle shaft 19, and the circular ring is in small clearance fit. This feature is used to adjust the axial clearance of the wire damper 20 and the damper torsion spring 21 while radially positioning the damper torsion spring 21.

Preferred specifications for the various components of the pawl assembly are as follows:

the pawl 25, the preferred scheme is specifically: including a base 25A and a ring segment 25B, as shown in fig. 19. The base body 25A and the circular ring section are connected into a whole, and a through hole is arranged in the center, the diameter of the through hole is larger than that of the pawl shaft 23, and the through hole is in small clearance fit. Meanwhile, a small hole is formed beside the central through hole and used for being connected with one end of the pawl torsion spring. The circular ring part of the base body 25A is provided with a boss which is matched with the limiting column 28 to limit the pawl to rotate towards the limiting column 28. The end surface 25D of the extending end of the base body 25A is matched with the pawl of the ratchet wheel plate 6 to limit the rotation of the ratchet wheel plate.

The present invention is a high reduction ratio low impact release mechanism for a wire-type low impact separation device, comprising: the device comprises a base (17), an upper cover (4), a connecting and separating assembly, a locking and unlocking assembly, an electromagnetic driving assembly and a pawl assembly;

the connecting and separating assembly reduces the elastic pretightening force and transmits the reduced elastic pretightening force to the locking and unlocking assembly, and the locking and unlocking assembly further reduces the reduced elastic pretightening force and transmits the reduced elastic pretightening force to the electromagnetic driving assembly; the electromagnetic driving component is used for keeping the further reduced elastic pretightening force, so that the bag belt is locked;

Preferably, two needle bearings 12 are respectively arranged between the flywheel seat 9 and the central rotating shaft 14A of the flywheel nut 14, and between the base 15 and the central rotating shaft 14A of the flywheel nut 14. Two thrust needle roller bearings 13 are respectively arranged between the flywheel seat 9 and the middle cylindrical section 14D of the flywheel nut 14, and between the base 15 and the middle cylindrical section 14D of the flywheel nut 14. Two ends of the central rotating shaft 14A of the flywheel nut 14 penetrate through the inner hole of the needle bearing 12 to realize radial support. And the end surfaces of two sides of the middle cylindrical section 14D of the fly wheel nut 14 are attached to the thrust needle roller bearing 13, so that the axial positioning of the fly wheel nut 14 is realized. The left bearing cover 5 and the right bearing cover 16 are arranged on the end faces of the flywheel seat 9 and the base 15 and limit the axial movement of the two needle roller bearings 12. The assembly comprises 4 stop pins 10, and a large column section 9B of the flywheel seat 9 and a middle column section 14D of the flywheel nut 14 are matched with the stop

pin mounting grooves

pin mounting slots

trapezoidal threads

pin mounting grooves

pin mounting groove

The pawl shaft 23 penetrates through the antifriction pad 24, the pawl 25, the pawl torsion spring 26 and the antifriction ring 27 in sequence, and then is screwed on the pawl mounting plate 29. The pawl torsion spring 26 is connected at one end to the pawl 25 and at the other end to the pawl mounting plate 29 to ensure that the pawl 25 is always pressed against the ratchet plate 6. The limit post 28 is screwed on the pawl mounting plate 29 to limit the pawl 25. The entire assembly is mounted on the base 17 by means of a pawl mounting plate 29

Preferably, a preferred method of assembling a high reduction force to low impact release mechanism for a string-type low impact separation device as described above, the preferred method steps are as follows:

1) sequentially mounting a polytetrafluoroethylene ring 8, a spring wire positioning ring 7 and a ratchet wheel disc 6 to a flywheel seat 9, and then connecting the ratchet wheel disc 6 and the spring wire positioning ring into a whole by using screws; sequentially installing the needle bearing 12 and the left bearing cover 5 on the flywheel seat 9 and fixing the needle bearing and the left bearing cover by using screws; the thrust needle roller bearing 13 is arranged on the flywheel seat 9, and then the central rotating shaft of the flywheel nut 14 penetrates through the needle roller bearing 12 until the end face of the middle cylindrical section of the flywheel nut 14 is attached to the thrust needle roller bearing 13; fixing the assembled parts by using a special fixing tool, and avoiding out the operation space at the opening side of the large cylindrical section of the flywheel seat 9 for subsequent assembly operation;

2) the needle bearing 12 and the right bearing cover 16 are sequentially mounted on the base 15 and fixed by screws; placing the assembled parts on a workbench by taking a right bearing cover as a bottom surface, then installing a thrust needle roller bearing 13 on a base 15, then penetrating a central rotating shaft of the flywheel nut 14 fixed in the step 1) through the needle roller bearing 12 until a flange surface of the flywheel seat 9 is attached to the base 15, and then fixing the parts by using screws;

3) mounting a torsion spring wire 14 to the large column section of the flywheel seat 9, and inserting an inner joint 11B of the torsion spring wire 14 into a small hole in the circular ring surface of the spring wire positioning ring 8;

4) respectively penetrating the left pre-tightening rod 1 and the right pre-tightening rod 18 through the left bearing cover 5 and the right bearing cover 16, simultaneously inserting the flywheel nut 14, and rotating the flywheel nut 14 to enable the pre-tightening rods to be screwed into the flywheel nut 14 until the pre-tightening rods and the flywheel nut 14 are attached;

5) mounting a pre-tightening nut 2 and a ball pad 3 to a left pre-tightening rod 1 and a right pre-tightening rod 18 respectively; step 1) -after completion of step 5), the connecting and disconnecting components are completely assembled, as shown in FIG. 3;

6) the spring wire baffle shaft 19 sequentially penetrates through the spring wire baffle 20, the baffle torsional spring 21 and the baffle torsional spring sleeve 22 mounting holes, and then is connected with the base 17 through threads at the end part, as shown in fig. 4; one end of the baffle torsional spring 21 penetrates through a mounting hole of the torsional spring baffle, and the other end of the baffle torsional spring passes through a mounting hole of the base 17;

7) the tail part of the electromagnetic actuator 34 passes through the electromagnetic actuator mounting plate 33 and is connected and fastened by screws; the spring end cover 32 is installed at the tail part of the stop lever of the electromagnetic actuator 34, then the reset spring sleeve 31 is sleeved on the spring end cover 32, and then the spring gland 30 is installed on the electromagnetic actuating installation plate 33, and two fixed connections are realized through threaded connection. At this time, the return spring 31 is in a compressed state, and the stop lever of the electromagnetic actuator 34 is pushed out until the spring end cap 32 is attached to the electromagnetic actuating mounting plate, and at this time, the stop lever is in a position for limiting the spring wire baffle 20. FIG. 5 shows the electromagnetic drive assembly in an unlocked state and FIG. 7 shows the electromagnetic drive assembly in a locked state; fig. 9 is a first schematic view of the unlocked state of the present invention. Fig. 10 is a second schematic view of the unlocked state of the present invention.

8) Connecting the cable outgoing line of the electromagnetic actuator 34 to the electric connector 35, and completing the electric cable installation and the wire routing and fixing; then, the electric connector 34 is mounted to the electromagnetic actuator mounting plate 33 and fixed with screws; finally, the whole electromagnetic driving component is fixed on the base 17 through the electromagnetic actuating mounting plate 33;

9) the pawl shaft 23 is sequentially passed through the antifriction pad 24, the pawl 25, the pawl torsion spring 26, and the antifriction ring 27, and then mounted to the pawl mounting plate 29. Wherein one end of the pawl torsion spring 26 passes through the mounting hole of the pawl 25 and the other end passes through the mounting hole of the pawl mounting plate 29. Mounting the limiting column 28 on the pawl mounting plate 29, and then mounting the whole assembly on the base 17 and fixing the whole assembly by using screws;

10) when the power is switched on, the stop lever of the electromagnetic actuator 34 retracts, the spring wire baffle 20 is manually rotated to the reset position, then the power is cut off, the stop lever of the electromagnetic actuator 34 extends out, and the limit is realized on the spring wire baffle 20;

11) the depth of the left pre-tightening rod 1 and the right pre-tightening rod 18 inserted into the flywheel nut 14 is adjusted, and after the stop pin installation groove 9C of the flywheel seat 9 and the stop pin installation groove 14E of the flywheel nut 14 are aligned for the first time, the four stop pins 10 are placed into the stop pin installation grooves. The ratchet wheel plate 6 rotates anticlockwise, the spring wire positioning ring 7 pulls the external joint 11C of the torsion spring wire 11 to rotate, when the external joint 11C of the torsion spring wire 11 is captured by the spring wire baffle plate 20 and limited, the torsion spring wire 11 cannot rotate, and the external joint is tightly held on the large column section 9B of the flywheel seat 9 along with the continuous rotation of the ratchet wheel plate, the stop pin 10 is limited in the stop pin mounting grooves of the flywheel nut 14 and the flywheel seat 9, the whole mechanism is assembled, and the whole mechanism is in a locking state, as shown in fig. 7.

The preferred scheme is as follows: the entire mechanism preferably comprises three states:

(1) connecting and locking: in the state, the left pre-tightening rod 1 and the right pre-tightening rod 18 are reliably connected with the flywheel nut 14, and the elastic pre-tightening force is generated on the wrapping tape by adjusting the pre-tightening nuts 2 on the left pre-tightening rod 1 and the right pre-tightening rod 18. The pretightening force is transmitted to the flywheel nut 14 through the left pretightening rod 1 and the right pretightening rod 18, so that the flywheel nut generates rotation potential energy. The rotation potential energy is transmitted through the stop pin 10, the torsion spring wire 11 and the spring wire baffle 20 and gradually reduced, and finally the limit is realized through the stop lever of the electromagnetic actuator 34;

(2) unlocking and separating: the electromagnetic actuator 34 is electrified after receiving the instruction, the electric energy is converted into electromagnetic force to enable the electromagnetic actuator to contract, after the limit of the spring wire baffle 20 is released, the electromagnetic actuator rotates clockwise under the thrust action of the baffle torsion spring 21 and the torsion spring wire 11 to release the limit of the torsion spring wire 11, the torsion spring wire 11 is loosened, the stop pin 10 is pushed out by the flywheel nut 14, and the rotation limit of the flywheel nut 14 is released. Because the flywheel nut 14 is connected with the left pre-tightening rod 1 and the right pre-tightening rod 2 through non-self-locking trapezoidal threads, after the rotation limitation of the flywheel nut 14 is removed, the flywheel nut rapidly rotates under the action of pre-tightening force, the hexagonal matching of the left pre-tightening rod 1 and the left bearing cover 5 and the hexagonal matching of the right pre-tightening rod 18 and the right bearing cover 16 limit the rotation of the two pre-tightening rods, and the rotation of the flywheel nut 14 can only push the left pre-tightening rod 1 and the right pre-tightening rod 18 out until a wrapping belt is separated from a star-arrow separation surface to realize unlocking separation;

(3) resetting the mechanism: after the whole mechanism is unlocked, the stop lever of the electromagnetic actuator 34 is retracted when the mechanism is powered on, the spring wire baffle 20 is manually rotated to the reset position, then the power is cut off, the stop lever of the electromagnetic actuator 34 extends out, and the spring wire baffle 20 is limited. The left pre-tightening rod 1 and the right pre-tightening rod 18 are pushed into the flywheel nut 14 to realize threaded connection. And then the four stop pins 10 are placed in the stop pin mounting grooves of the flywheel seat 9 and the flywheel nut 14. The ratchet wheel disc 6 is rotated anticlockwise, the spring wire positioning ring 7 pulls the external joint 11C of the torsion spring wire 11 to rotate, when the external joint 11C of the torsion spring wire 11 is captured and limited by the spring wire baffle plate 20, the torsion spring wire 11 cannot rotate and is tightly held on the large column section 9B of the flywheel seat 9 along with the continuous rotation of the ratchet wheel disc, the stop pin 10 is limited in the stop pin mounting grooves of the flywheel nut 14 and the flywheel seat 9, and the resetting of the whole mechanism is realized;

the invention relates to a large-reducing-force-ratio low-impact release mechanism for a linear low-impact separation device, which mainly comprises a base 17, an upper cover 4, a connecting and separating assembly, a locking and unlocking assembly, an electromagnetic driving assembly, a pawl assembly and the like. The connecting and separating assembly and the locking and unlocking assembly are respectively arranged on the inner bottom surface 17A of the base 17, the electromagnetic driving assembly is arranged on the upper surface 17B of the base, and the pawl assembly is arranged on the left side surface 17C of the base. The rectangular boss 17D on the right side of the base 17 is designed with a set of mounting holes for interfacing with external mounting interfaces, as shown in fig. 20. When the whole mechanism is locked, the flywheel nut 14 cannot rotate, and the left pre-tightening rod 1 and the right pre-tightening rod 18 are reliably connected with the flywheel nut 14 through non-self-locking threads. At the moment, the whole mechanism is connected with an external bag belt through a threaded section at the other end of the pre-tightening rod, the pre-tightening nut 2 and the ball pad 3, and pre-tightening and locking of the bag belt are achieved.

The connecting and separating assembly comprises a left pre-tightening rod 1, a pre-tightening nut 2, a ball pad 3, a left bearing cover 5, a ratchet wheel disc 6, a spring wire positioning ring 7, a polytetrafluoroethylene ring 8, a flywheel seat 9, a stop pin 10, a torsion spring wire 11, a needle bearing 12, a thrust needle bearing 13, a flywheel nut 14, a base 15, a right bearing cover 16, a right pre-tightening rod 18 and the like, and is shown in fig. 3. The ratchet wheel plate 6 and the spring wire positioning ring 7 are fixed into a whole in a threaded mode and then are installed in the flywheel seat 9 together with the polytetrafluoroethylene ring 8. The two needle roller bearings 12 are respectively arranged in the flywheel seat 9 and the base 15 and are fixed by a left bearing cover 5 and a right bearing cover 16. Two thrust needle roller bearings 13 are arranged in the flywheel seat 9 and the base 15, a flywheel nut is arranged in an inner hole of a needle roller bearing 12 of the flywheel seat 9, and then the base 15 which is provided with the needle roller bearing 12 and the thrust needle roller bearing 13 is connected with the flywheel seat 9 and the flywheel nut 14 and is in threaded connection with the flywheel seat 9. The axial and radial positioning and bearing of the flywheel nut are realized through the needle bearing 12 and the thrust needle bearing 13. The torsion spring wire 11 is sleeved in the outer cylinder of the flywheel seat 9, the outer end of the torsion spring wire is connected with the mounting hole of the spring wire positioning ring 7, and the inner end of the torsion spring wire is physically limited through the spring wire arm 20. And (4) pulling the torsion spring wire open, and respectively placing the four stop pins 10 into the stop

pin mounting grooves

9C and 14E of the flywheel nut 14 and the flywheel seat 9. And the left pre-tightening rod 1 and the right pre-tightening rod 18 are respectively pushed into the hexagonal holes of the left bearing cover 5 and the right bearing cover 16 to realize threaded connection with the flywheel nut 14. Matched threads are machined on the parts, connected with the pre-tightening nuts 2, of the left pre-tightening rod 1 and the right pre-tightening rod 18, and loading of pre-tightening force is achieved. The whole assembly is fastened and connected with a base 17 through screws uniformly distributed along the circumference on a base 15.

The locking and unlocking assembly is composed of a spring baffle shaft 19, a spring baffle 20, a baffle torsion spring 21 and a baffle torsion spring sleeve 22, as shown in fig. 4. The spring wire baffle shaft 19 penetrates through the mounting holes of the spring wire baffle 20, the baffle torsional spring 21 and the baffle torsional spring sleeve 22 in sequence and then is connected with the base 17 through threads at the end part. One end of the baffle torsional spring 21 is connected with the spring wire baffle 20, the other end is connected with the base 17, and the initial pre-tightening torque enables the spring wire baffle 20 to rotate anticlockwise. The end part of the spring wire baffle 20 connected with the torsion spring wire 11 is designed to be of a U-shaped structure, the width of the U shape is larger than the displacement of the end of the torsion spring wire 11 along the releasing direction of the pre-tightening rod, and the end of the spring wire can be captured during resetting.

The electromagnetic driving assembly is composed of a spring gland 30, a return spring 31, a spring end cover 32, an electromagnetic actuating mounting plate 33, an electromagnetic actuator 34 and an electric connector 35, as shown in fig. 5. The electromagnetic actuator 34 is connected with the electromagnetic actuating mounting plate 33 through a nut, a spring end cover 32 and a return spring 31 are mounted at the tail of a stop lever of the electromagnetic actuator 34, a spring gland 30 is connected with the electromagnetic actuating mounting plate 33 through threads, the return spring 31 is in a compressed state, the stop lever is pushed out until the spring end cover 32 is attached to the electromagnetic actuating mounting plate, and at the moment, the stop lever is located at the position of the limiting spring wire baffle plate 20. The electric connector 35 penetrates the electromagnetic actuator mounting plate 33 from the inside and is fixed by screw connection. The cable of the electromagnetic actuator 34 is connected to the electrical connector 35 and the entire assembly is then secured to the base 17 by the electromagnetic actuating mounting plate 33.

The pawl assembly is composed of a pawl shaft 23, an antifriction pad 24, a pawl 25, a pawl torsion spring 26, an antifriction ring 27, a limit post 28 and a pawl mounting plate 29, as shown in fig. 6. The pawl shaft 23 penetrates through mounting holes of the antifriction pad 24, the pawl 25, the pawl torsion spring 26 and the antifriction ring 27 in sequence and then is connected with the pawl mounting plate 29 through threads at the end part. Pawl torsion spring 26 has one end connected to pawl 25 and one end connected to pawl mounting plate 29 to ensure that the pawl is always pressed against ratchet plate 6. The limit post 28 is screwed on the pawl mounting plate 29 to limit the pawl 25. The entire assembly is mounted to side 17C of base 17 by pawl mounting plate 29.

When the whole mechanism works, the connection and locking, unlocking and separation and reset states are switched in sequence. When the connecting and locking are carried out, the left pre-tightening rod 1 and the right pre-tightening rod 18 are reliably connected with the flywheel nut 14, and the elastic pre-tightening force is generated on the wrapping tape by adjusting the pre-tightening nut 2 on the pre-tightening rods. The pre-tightening force is transmitted to the flywheel nut 14 through the pre-tightening rod, so that the flywheel nut generates rotational potential energy. The rotation potential energy is transmitted through the stop pin 10, the torsion spring wire 11 and the spring wire baffle 20 and gradually reduced, and finally the limit is realized through the stop lever of the electromagnetic actuator 34. When unlocking and separating are carried out, the electromagnetic actuator 34 receives the instruction and then is electrified, electric energy is converted into electromagnetic force to enable the electromagnetic actuator to contract, after the limit of the spring wire baffle 20 is released, the electromagnetic actuator rotates clockwise under the thrust action of the baffle torsion spring 21 and the torsion spring wire 11 to release the limit of the torsion spring wire 11, the torsion spring wire 11 is loosened, the stop pin 10 is pushed out by the flywheel nut 14, and the rotation limit of the flywheel nut 14 is released. Because the flywheel nut 14 is connected with the pre-tightening rod through the non-self-locking trapezoidal threads, after the rotation limitation of the flywheel nut 14 is removed, the flywheel nut rapidly rotates under the action of the pre-tightening force, the left pre-tightening rod 1 and the right pre-tightening rod 18 are pushed out until the wrapping belt is separated from the satellite-rocket separation surface, and the unlocking separation is realized. When the mechanism resets, the stop lever of the electromagnetic actuator 34 retracts when being electrified, the spring wire baffle 20 is manually rotated to the reset position, then the power is cut off, the stop lever of the electromagnetic actuator 34 extends out, and the limit of the spring wire baffle 20 is realized. The left pre-tightening rod 1 and the right pre-tightening rod 18 are pushed into the flywheel nut 14 to realize threaded connection. And then the four stop pins 10 are placed in the stop pin mounting grooves of the flywheel seat 9 and the flywheel nut 14. The ratchet wheel plate 6 rotates anticlockwise, the spring positioning ring 7 pulls one end of the torsion spring wire 11 to rotate anticlockwise, when the other end of the torsion spring wire 11 is captured by the spring wire baffle 20 and limited, the torsion spring wire 11 cannot rotate, and along with continuous rotation of the ratchet wheel plate, the torsion spring wire is tightly held on the large column section 9B of the flywheel seat 9, the stop pin 10 is limited in the stop pin mounting grooves of the flywheel nut 14 and the flywheel seat 9, and resetting of the whole mechanism is achieved.

The above is only one preferred embodiment of the technical scheme of the present invention, and the structure size can be changed according to actual needs, so as to realize separation and unlocking under different bearing forces.

The invention discloses a scheme for improving the locking and unlocking reliability of a flywheel nut 18, which comprises the following steps: in the locked state of the mechanism, the stress among the flywheel nut 14, the flywheel seat 9, the stop pin 10 and the torsion spring wire 11 is as shown in fig. 21. The relationship between the positive pressure Fs of the torsion spring wire 11 on the stop pin 10, the thrust Fm of the flywheel screw 14 on the stop pin 10, the acting force direction theta and the friction coefficient mu of each moving part is as follows:

wherein Fs is the positive pressure of the torsion spring wire 11 on the stop pin 10, Fm is the thrust of the flywheel nut 14 on the stop pin 10, theta is the included angle between the force Fm and the horizontal direction, mu is the friction coefficient between each moving part, and k is the force reduction coefficient, and is 0.1-0.2. When the force reduction coefficient k is taken as a value from 0.1 to 0.2, and the depth of the stop pin mounting groove 14E of the flywheel nut 14 is designed according to different value ranges of the friction coefficient mu of each moving part, the reliability of locking and unlocking of the mechanism can be ensured by ensuring the value theta to be within the range of table 1.

TABLE 1 μ and θ value matching Table

The invention discloses a large-reduction-ratio low-impact release mechanism for a linear low-impact separation device, which develops a sample machine and performs a mechanism resistance test and an unlocking performance test.

The mechanism resistance test is used for quantitatively obtaining the thrust required for pushing the left pre-tightening rod and the right pre-tightening rod out when the whole mechanism is unlocked. Test results show that when the end parts of the left and right pre-tightening rods simultaneously apply 9.8N of pulling force, the pre-tightening rods can be smoothly released from the flywheel nuts, and the mechanism is normally unlocked.

The unlock performance test is used to verify the load bearing capacity and impact of the mechanism. Test results show that when 60kN pretightening force is applied, the mechanism can be reliably locked, after the mechanism is electrified, the mechanism is normally unlocked, the unlocking time is 107ms, and the unlocking impact is 917g which is far less than the impact generated by the initiating explosive unlocking device.

Claims

1. A high reduction force, low impact release mechanism for a wire-type low impact separation device, comprising: the device comprises a base (17), an upper cover (4), a connecting and separating assembly, a locking and unlocking assembly, an electromagnetic driving assembly and a pawl assembly;

2. A high reduction force, low impact release mechanism for a wire-type low impact separation device according to claim 1, wherein: a connect and disconnect assembly comprising: the left pre-tightening rod (1), the pre-tightening nut (2), the ball pad (3), the left bearing cover (5), the ratchet wheel disc (6), the spring wire positioning ring (7), the polytetrafluoroethylene ring (8), the flywheel seat (9), the stop pin (10), the torsion spring wire (11), the needle roller bearing (12), the thrust needle roller bearing (13), the flywheel nut (14), the base (15), the right bearing cover (16) and the right pre-tightening rod (18), the left pre-tightening rod (1) comprises a small hexagonal section (1A), a cylindrical section (1B), a large hexagonal section (1C) and a left-handed trapezoidal thread section (1D), the flywheel seat (9) comprises a small cylindrical section (9A), a large cylindrical section (9B), a stop pin mounting groove (9C), a needle roller bearing mounting hole (9D), a thrust bearing mounting surface (9E) and a flange section (9F), the right pre-tightening rod (18) comprises a small hexagonal section (18A), a cylindrical section (18B), a large hexagonal section (18, the center of the ball pad (3) is a through hole, and the diameter of the through hole is larger than the diameter of the cylindrical sections of the left pre-tightening rod (1) and the right pre-tightening rod (18); the flywheel nut (14) comprises a central rotating shaft 14A, a left-handed trapezoidal thread section 14B, a right-handed trapezoidal thread section 14C, a middle cylindrical section 14D and a stop pin mounting groove 14E, and the assembly is one of key assemblies for realizing large bearing and low impact of a mechanism; when the assembly is locked, the left-handed trapezoidal thread section 14B and the right-handed trapezoidal thread section 14C on the locked flywheel nut (14) are connected with the left-handed trapezoidal thread section 1D of the left pre-tightening rod (1) and the right-handed trapezoidal thread section 2D of the right pre-tightening rod (18), and the pre-tightening force of the wrapping belt is loaded through the pre-tightening nut (2) and the ball pad (3); when the bag is unlocked, the flywheel nut (14) rotates at a high speed under the action of pretightening force to push out the pretightening rods at two ends, so that the bag belt is unlocked and separated quickly.

3. A high reduction force, low impact release mechanism for a wire-type low impact separation device according to claim 1, wherein: two needle roller bearings (12) are respectively arranged between the flywheel seat (9) and the central rotating shaft 14A of the flywheel nut (14), and between the base (15) and the central rotating shaft 14A of the flywheel nut (14); two thrust needle roller bearings (13) are respectively arranged between the flywheel seat (9) and the middle cylindrical section (14D) of the flywheel nut (14), and between the base (15) and the middle cylindrical section (14D) of the flywheel nut (14); two ends of a central rotating shaft 14A of the flywheel nut (14) penetrate through inner holes of the needle roller bearings 12 to realize radial support; and the end surfaces of two sides of the middle cylindrical section 14D of the flywheel nut 14 are attached to the thrust needle roller bearing (13), so that the axial positioning of the flywheel nut (14) is realized.

4. A high reduction force, low impact release mechanism for a wire-type low impact separation device according to claim 1, wherein: the left bearing cover (5) and the right bearing cover (16) are arranged on the end surfaces of the flywheel seat (9) and the base (15) to limit the axial movement of the two needle roller bearings (12); the assembly comprises 4 stop pins (10), and a large column section 9B of a flywheel seat (9) and a middle cylindrical section 14D of a flywheel nut 14 are matched with the stop pin mounting grooves 9C and 14E at four quadrant positions; when the stop pin (10) is positioned in the stop pin mounting grooves 9C and 14E of the flywheel seat (9) and the flywheel nut (14), the rotation freedom of the flywheel nut (14) is limited and can not rotate.

5. A high reduction force, low impact release mechanism for a wire-type low impact separation device according to claim 1, wherein: the ratchet wheel disc (6), the spring wire positioning ring (7) and the polytetrafluoroethylene ring (8) are arranged on the flywheel seat, and axial limiting is realized through the left bearing cover (5); the ratchet wheel disc (6) and the spring wire positioning ring (7) are fixedly connected through a screw; one end interface of the torsion spring wire (11) is fixedly connected with the spring wire positioning ring (7), and the other end of the torsion spring wire realizes physical limit through a spring wire arm (20); at the initial position, after one end of the torsion spring wire (11) is limited by the spring wire arm (20), the ratchet wheel disc (6) is rotated anticlockwise (seen from the left pre-tightening rod 1 to the upper cover 4), the spring wire positioning ring (7) is driven to rotate, and therefore the torsion spring wire (11) is enabled to tightly hold the flywheel seat (9), and the stop pin (10) is limited.

6. A high reduction force, low impact release mechanism for a wire-type low impact separation device according to claim 1, wherein: the connecting section of the left pre-tightening rod (1) and the flywheel nut (14) is provided with left-handed multi-head trapezoidal threads 1D and 14B, and the connecting section of the right pre-tightening rod (18) and the flywheel nut (14) is provided with right-handed multi-head trapezoidal threads 18D and 14C;

matched threads are machined on the parts, connected with the pre-tightening nuts (2), of the left pre-tightening rod (1) and the right pre-tightening rod (18), so that pre-tightening force loading is realized; the matching part of the left pre-tightening rod (1) and the left bearing cover (5) and the matching part of the right pre-tightening rod and the right bearing cover (16) are both designed with hexagonal matching, when the flywheel nut rotates, the left pre-tightening rod (1) and the right pre-tightening rod (18) are respectively limited by the left bearing cover (5) and the bearing cover (16) to rotate and can only be inserted or pushed out along the axial direction;

7. A high reduction force, low impact release mechanism for a wire-type low impact separation device according to claim 1, wherein: the locking and unlocking assembly consists of a spring wire baffle shaft (19), a spring wire baffle (20), a baffle torsional spring (21) and a baffle torsional spring sleeve (22), and has the functions of realizing reliable locking and unlocking of the connecting and separating assembly and manually resetting after unlocking;

when the locking device is locked, the spring wire baffle (20) limits one end of the torsion spring wire (11), so that the torsion spring wire (11) can reliably limit the stop pin (10) in the stop pin mounting grooves 9C and 14E of the flywheel seat (9) and the flywheel nut (14) after the ratchet wheel plate is reset, and the limitation of the flywheel nut (14) is realized; at the moment, the lever effect of the spring wire baffle (20) reduces the locking force on the end part of the torsion spring wire (11), and reliable locking is realized; when the lock is unlocked, the electromagnetic driving assembly is triggered to release the limit of the spring wire baffle plate 20, the spring wire baffle plate rotates under the thrust action of the end part of the torsion spring wire (11), then the end part of the torsion spring wire (11) is separated, the shape is quickly recovered, the radial limit of the stop pin (10) is released, the stop pin (10) is extruded out of the stop pin mounting groove 14E by the thrust of the flywheel nut 14, the flywheel nut (14) rotates under the action of pre-tightening force, and the left pre-tightening rod (1) and the right pre-tightening rod (18) are pushed out through spiral transmission to realize separation; when the electromagnetic driving assembly is reset, the stop lever of the electromagnetic driving assembly is firstly electrified to be retracted, then the spring wire baffle (20) is manually rotated anticlockwise to a locking position, and then the electromagnetic driving assembly is powered off to push out the stop lever to limit the spring wire baffle (20);

the spring wire baffle shaft (19) penetrates through the spring wire baffle (20), the baffle torsional spring (21) and the baffle torsional spring sleeve (22) in sequence and then is connected with the base (17) through threads at the end part.

8. A high reduction force, low impact release mechanism for a wire-type low impact separation device according to claim 1, wherein: the electromagnetic driving assembly consists of a spring gland (30), a return spring (31), a spring end cover (32), an electromagnetic actuating mounting plate (33), an electromagnetic actuator (34) and an electric connector (35), and the electromagnetic driving assembly has the functions of realizing the reliable locking and unlocking of the locking and unlocking assembly and is a driving source triggered by the unlocking of the whole mechanism;

the assembly is designed to be in a working state of power-off locking and power-on triggering; when the power is cut off, a stop lever of the electromagnetic actuator (34) extends out under the pushing of the reset spring (31) to block the spring wire baffle (20), so that the reliable locking of the locking and unlocking assembly is realized; after the power is switched on, a stop lever of the electromagnetic actuator (34) overcomes the thrust of the reset spring (31) and the friction force of the spring wire baffle (20), retracts into the electromagnetic actuator, the limit of the spring wire baffle (20) is released, and the unlocking of the locking and unlocking assembly is realized;

the electromagnetic actuator (34) is connected with the electromagnetic actuating mounting plate (330) through a nut, a spring end cover (32) and a return spring (31) are mounted at the tail of a stop lever of the electromagnetic actuator (34), a spring gland (30) is connected with the electromagnetic actuating mounting plate (33) through threads, the return spring (31) is in a compressed state, the stop lever is pushed out until the spring end cover (32) is attached to the electromagnetic actuating mounting plate (33), the stop lever is at the position of limiting the spring wire baffle (20), an electric connector (35) penetrates out of the electromagnetic actuating mounting plate (33) from the inside and is fixedly connected through screws, a cable of the electromagnetic actuator (34) is connected to the electric connector (35), and then the whole assembly is fixed on the base (17) through the electromagnetic actuating mounting plate (33).