CN114313267A - Mechanical control box with double-spring action mechanism - Google Patents
Mechanical control box with double-spring action mechanism Download PDFInfo
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- CN114313267A CN114313267A CN202111537014.3A CN202111537014A CN114313267A CN 114313267 A CN114313267 A CN 114313267A CN 202111537014 A CN202111537014 A CN 202111537014A CN 114313267 A CN114313267 A CN 114313267A
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- pawl
- tension spring
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- control box
- steel cable
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 51
- 239000010959 steel Substances 0.000 claims abstract description 51
- 239000000126 substance Substances 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 8
- 230000002238 attenuated effect Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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Abstract
The invention provides a mechanical control box with a double-spring action mechanism, which comprises: the device comprises a box body (1), an upper steel cable section (3), a locking support arm (4), a pawl (6), an upper tension spring (8), an adapter rocker arm (9), a lower steel cable section (10) and a lower tension spring (11); upper tension springs (8) and lower tension springs (11) which are arranged in parallel from top to bottom are connected with a pawl (6) through a switching rocker arm (9), and under the condition that the volume is basically unchanged, the problems that the mechanical control box of a single-spring action mechanism is obviously attenuated in the pulling process and the pulling force cannot meet the requirement when the mechanical control box is applied to a novel hanging system are solved.
Description
Technical Field
The invention belongs to the technology of an external hanging system, and particularly relates to a mechanical control box with a double-spring action mechanism.
Background
The main function of the external hanging system of the helicopter is that goods can be hung outside the helicopter through a sling, so that the function of transporting goods outside the helicopter is realized, and the helicopter can perform tasks such as material transportation, emergency rescue and relief, forest fire fighting and the like. An operator on the helicopter hoisting system generally opens the lifting hook to release the goods through two modes of electrical throwing and mechanical throwing, the electrical throwing mode is usually used, and when the electrical throwing system cannot work normally, a pilot opens the lifting hook to throw the goods through manually pulling the steel cable, so that the navigation safety of the helicopter is guaranteed in an emergency.
The mechanical control box belongs to an important component of an external hanging mechanical throwing system. The control steel cable of the cargo hook needs to be pulled to realize the mechanical throwing function, the general cargo hook needs larger pulling force and enough pulling travel when being opened in a mechanical mode, and the control steel cable is difficult to realize by directly pulling the steel cable by a pilot. The application of the mechanical control box achieves the aim, the pilot can pull the locking mechanism in the mechanical control box without directly pulling the whole steel cable, after the locking mechanism is opened, the control steel cable at the rear part is pulled under the action of the spring in the control box to open the lifting hook, and after the locking mechanism is opened, the resetting handle on the control steel cable needs to be manually pushed to be locked again.
The emergency throwing requirement of the novel outer hanging system is increased more and more, a main tension spring in a mechanical throwing control box applied to the existing outer hanging system is in a single spring form, the deformation of the spring is reduced in the pulling process due to the characteristics of the spring, so that the tension generated in the final state after pulling is obviously attenuated compared with that before pulling, and when the tension value after attenuation is balanced with the force at the other end of a steel cable pulled by the tension spring, the pulling stroke of the tension spring cannot meet the emergency throwing requirement of the novel outer hanging system. Although the pulling stroke can meet the requirement when the attenuated pulling force is balanced by replacing the spring with larger elastic coefficient, the pulling force in the initial state before pulling is overlarge, and the control box is difficult to reset to the initial state by manpower after being opened; increasing the spring length to decrease the spring rate can reduce the attenuation of the pulling force in the pulling stroke to meet the requirement, but increasing the spring length to a suitable value can increase the volume of the whole control box by more than 1 time, which is difficult to realize due to the limitation of the installation space on the machine.
Disclosure of Invention
The embodiment of the invention provides a mechanical control box with a double-spring action mechanism, which solves the problems that the spring force of the mechanical control box with a single-spring action mechanism is obviously attenuated in the pulling process and the pulling force cannot meet the requirement when the mechanical control box is applied to a novel hanging system under the condition of ensuring that the volume is basically unchanged.
The embodiment of the invention provides a mechanical control box with a double-spring action mechanism, which comprises: the device comprises a box body 1, an upper steel cable 3, a locking support arm 4, a pawl 6, an upper tension spring 8, an adapter rocker arm 9, a lower steel cable 10 and a lower tension spring 11; wherein the content of the first and second substances,
the locking support arm 4, the pawl 6 and the switching rocker arm 9 are all rotatably connected in the box body 1;
one end of the upper steel cable 3 is connected with a handle on the steering column, the other end of the upper steel cable is connected with a first end of a locking support arm 4, and a clamping groove for clamping a pawl 6 is formed in the locking support arm 4;
when the mechanical control box is locked, the first end of the pawl 6 is clamped in the clamping groove of the locking support arm 4, and the second end of the pawl 6 is connected with the lifting hook throwing mechanism through the lower steel cable 10; the first end of the pawl 6 is also connected with the first end of an upper tension spring 8, the first end of a lower tension spring 11 is connected with a pin which is fixed on the box body 1 and is arranged close to the pawl 6, the second ends of the upper tension spring 8 and the lower tension spring 11 are respectively connected with the two ends of the switching rocker arm 9, and the upper tension spring 8 and the lower tension spring 11 are arranged in an up-and-down parallel manner;
when the mechanical control box is opened, an operator pulls the upper steel cable 3 upwards through the handle to drive the locking support arm 4 to rotate upwards, the pawl 6 is released, the pawl 6 rotates under the action of the pulling force of the upper pulling spring 8 and the lower pulling spring 11, and the lower steel cable 10 drives the lifting hook throwing mechanism to move to open the lifting hook.
Optionally, the rotating shaft of the switching rocker arm 9 is located at the midpoint of the length thereof.
Optionally, the upper tension spring 8 and the lower tension spring 11 are made of 70 steel wires with a diameter of 2.5mm, the length of the steel wires is 62mm, and the outer diameter of the steel wires is 18 mm.
Optionally, the effective number of turns of the upper tension spring 8 and the lower tension spring 11 is 12.75, and the elastic coefficient k is 8.21N/mm.
Optionally, the method further includes: a reset handle 2;
the reset handle 2 is positioned outside the box body 1 and connected with the rotating shaft of the pawl 6 for driving the pawl 6 to reset.
Optionally, the method further includes: a return spring 5;
the first end of locking support arm 4 still is connected with reset spring 5's first end, and reset spring 5's second end fixed connection is on box body 1.
Optionally, the method further includes: a balance tension spring 7;
the second end of locking support arm 4 is connected with the first end of balance tension spring 7, and the second end fixed connection of balance tension spring 7 is on box body 1.
Alternatively, the pivot axis of the locking arm 4 is located near the second end of the locking arm 4.
The invention provides a mechanical control box with a double-spring action mechanism, which solves the problems that the spring force of the mechanical control box with a single-spring action mechanism is obviously attenuated in the pulling process and the pulling force cannot meet the requirement when the mechanical control box is applied to a novel hanging system under the condition of ensuring that the volume is basically unchanged. The invention obviously reduces the attenuation of the pulling force of the spring in the pulling stroke by applying the rocker arm rotary type double-spring action mechanism, so that the output pulling force value is larger. Through calculation, when springs with the same specification are used, compared with a mechanical control box of a single-spring action mechanism, the output tension of the mechanical control box of the single-spring action mechanism is improved by 30%, the tension attenuation value of a unit pulling stroke is reduced by 50%, and the effective pulling stroke is improved by 100% under the condition that the force values before and after pulling are constant, so that the mechanical control box has wider application occasions.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a mechanical control box with a dual spring action mechanism according to the present invention;
FIG. 2 is a schematic view of a locking state of the mechanical control box according to the present invention;
FIG. 3 is a schematic view of an open state of a mechanical control box provided by the present invention;
FIG. 4 is a schematic view of the locking arm and pawl assembly of the present invention;
FIG. 5 is a first schematic structural view of a locking arm according to the present invention;
FIG. 6 is a second schematic structural view of a locking arm according to the present invention;
FIG. 7 is a third schematic structural view of a locking arm according to the present invention;
FIG. 8 is a fourth schematic structural view of a locking arm according to the present invention;
FIG. 9 is a schematic view of the installation of the reset handle provided by the present invention;
FIG. 10 is a schematic structural view of a reset handle provided by the present invention;
FIG. 11 is a first schematic structural view of a tension spring according to the present invention;
fig. 12 is a second schematic structural view of the tension spring provided in the present invention;
description of reference numerals:
1-box body;
2-a reset handle;
3-upper steel cable;
4-locking the support arm;
5-a return spring;
6-pawl;
7-a balance tension spring;
8-a tension spring;
9-switching rocker arm;
10-lower steel cable;
11-lower tension spring.
Detailed Description
The mechanical control box with the double-spring action mechanism provided by the invention is explained in the following with the accompanying drawings.
Referring to the attached drawings 1-3, the invention provides a mechanical control box with a double-spring action mechanism, which is applied to an emergency mechanical throwing device hung outside a helicopter and installed on a front right longitudinal beam of the helicopter through a special bracket, and comprises: the device comprises a box body 1, a reset handle 2, an upper steel cable 3, a locking support arm 4, a reset spring 5, a pawl 6, a balance tension spring 7, an upper tension spring 8, a switching rocker arm 9, a lower steel cable 10 and a lower tension spring 11; wherein the content of the first and second substances,
the box body 1 comprises an upper box body and a lower box body, an upper section steel cable 3, a locking support arm 4, a reset spring 5, a pawl 6, a balance tension spring 7, a tension spring 8, a switching rocker arm 9, a lower section steel cable 10 and a tension spring 11 are all positioned in the box body 1, and the reset handle 2 is positioned outside the box body 1.
The locking support arm 4, the pawl 6 and the switching rocker arm 9 are all rotationally connected to the box body 1.
One end of the upper steel cable 3 is connected with a handle on the steering column, the other end of the upper steel cable is connected with the locking support arm 4, the pawl 6 is clamped in the locking support arm 4, and when an operator pulls the upper steel cable 3 upwards through the handle, the locking support arm 4 is driven to rotate upwards to release the pawl 6.
Two ends of the locking support arm 4 are respectively connected with a first end of the return spring 5 and a first end of the balance tension spring 7, and second ends of the return spring 5 and the balance tension spring 7 are respectively fixedly connected to the box body 1; the return spring 5 and the counter-tension spring 7 are used to return the locking arm 4 to the position of the clicking pawl 6 after the operator releases the handle. The rotating shaft of the locking support arm 4 is close to one side of the balance tension spring 7.
The first end of the pawl 6 is clamped in the locking support arm 4, the second end of the pawl 6 is connected with the lifting hook throwing mechanism through the lower steel cable 10, the first end of the pawl 6 is further connected with the first end of an upper tension spring 8, the second ends of the upper tension spring 8 and a lower tension spring 11 are respectively connected to two ends of the switching rocker arm 9, the first end of the lower tension spring 11 is connected with a pin which is fixed on the box body 1 and is close to the pawl 6, and the upper tension spring 8 and the lower tension spring 11 are arranged in parallel up and down.
When the locking support arm 4 loosens the pawl 6, under the action of the tension of the upper tension spring 8 and the lower tension spring 11, the pawl 6 rotates around the rotating shaft, the lower section steel cable 10 drives the lifting hook throwing mechanism to move, and the lifting hook is opened.
Illustratively, the rotating shaft of the switching rocker arm 9 is positioned at the middle point of the length of the switching rocker arm, so that the force arms acted by the two tension springs are basically equal, and the structure realizes the series arrangement of the two tension springs.
The mechanical control box provided by the invention is in a locking state at ordinary times, the movement of the pawl 6 is limited by the locking support arm 4, and the pulling force generated by the two tension springs cannot act on the lower steel cable 10. When an operator lifts the upper steel cable 3 up through a handle on the steering column, the locking support arm 4 rotates upwards, after the locking support arm rotates for a certain angle, the pawl 6 is separated from the locking support arm 4, the limit of the pawl 6 is relieved, the pawl 6 rotates under the action of the tensile force of the two tension springs, the lower steel cable 10 is pulled to move backwards, and the function that the lifting hook throwing mechanism is pulled through the steel cable to open the lifting hook is realized. When the operator releases the handle to stop lifting the upper steel cable 3, the locking support arm 4 is rotationally reset under the combined action of the reset spring 5 and the balance tension spring 7. The reset handle 2 outside the control box is required to be pushed upwards to reset the pawl 6, and the handle drives the pawl 6 to rotate so that the pawl is clamped and limited by the locking support arm 4 again and is restored to a locking state without tension output. The operator can repeat the above operations to realize the opening and closing of the mechanical control box for many times.
The mechanical control box with the double-spring action mechanism has the advantages that under the condition that the volume is basically unchanged, the mechanical control box with the single-spring action mechanism solves the problems that the spring force of the mechanical control box applied to a novel hanging system is obviously attenuated in the pulling process, and the pulling force cannot meet the requirement. The invention obviously reduces the attenuation of the pulling force of the spring in the pulling stroke by applying the rocker arm rotary type double-spring action mechanism, so that the output pulling force value is larger. Through calculation, when springs with the same specification are used, compared with a mechanical control box of a single-spring action mechanism, the output tension of the mechanical control box of the single-spring action mechanism is improved by 30%, the tension attenuation value of a unit pulling stroke is reduced by 50%, and the effective pulling stroke is improved by 100% under the condition that the force values before and after pulling are constant, so that the mechanical control box has wider application occasions.
When the cargo is hung on other objects by accident and the cargo needs to be thrown in an emergency mode to guarantee flight safety, and the electric throwing function of the hanging system fails and cannot take effect, a pilot uses the emergency mechanical throwing function to lift and pull the throwing handle to drive the throwing steel cable to open a locking mechanism in a mechanical control box, pulling force generated by a spring is transmitted to a lifting hook through the steel cable, the lifting hook is opened to realize emergency throwing of the cargo, and flight safety is guaranteed.
For example, as shown in fig. 9 and 10, after the mechanical control box is opened, the locking arm 4 may rotate clockwise along the rotation shaft by a certain distance under the pulling force of the return spring 5, so as to facilitate the return of the mechanical control box. When resetting, need to be rotated reset handle 2 by operating personnel and drive pawl 6 clockwise turning, pawl 6 and 4 contacts messenger locking support arm 4 overcome reset spring 5's pulling force along pivot anticlockwise rotation lifting a short distance, and when the tip of pawl 6 rotated the recess edge of locking support arm 4, the two breaks away from the contact, and locking support arm 4 rotates clockwise under reset spring 5's effect and falls back and advance and block pawl 6 and accomplish and reset.
The effect of balance spring 7 is that when mechanical control box was in the open mode, make locking support arm 4 resume near the original position before opening under the combined action of balance spring 7 and reset spring 5, the purpose is to make locking support arm 4 not fall too big distance because of reset spring 5's effect, and the resistance that avoids operating personnel to receive when rotating reset handle 2 and making mechanical control box reset is too big, has also avoided the appearance of jamming trouble to a certain extent.
Illustratively, as shown in fig. 11 and 12, the upper tension spring 8 and the lower tension spring 11 are made of 70 steel wires with the diameter of 2.5mm, the original length is 62mm, the outer diameter is 18mm, the effective turn number is 12.75, and the elastic coefficient k is 8.21N/mm.
According to the actual use requirement of an external hanging system of a certain type of helicopter, the external hanging emergency throwing function needs the lower steel cable 10 to pull the slider in the cargo hook connected with the lower steel cable to move by more than or equal to 20mm and keep the slider, and the pulling force for keeping the movement is more than or equal to 110N.
When the mechanical control box is in an open state and the upper tension spring 8 and the lower tension spring 11 pull the lower section steel cable 10 to move by 20mm through the pawl 6, because the two tension springs are equivalently connected in series, the jointly generated tension is 198.6N, and the tension applied to the lower section steel cable 10 through the pawl 6 is 136.8N which is greater than a specified value 110N, so that the requirements are met.
According to different requirements of emergency mechanical throwing of different types of external hanging equipment, the emergency mechanical throwing device can replace an upper tension spring 8 and a lower tension spring 11 with different parameters to meet different requirements.
Claims (8)
1. A mechanical control box with a dual spring action mechanism, comprising: the device comprises a box body (1), an upper steel cable section (3), a locking support arm (4), a pawl (6), an upper tension spring (8), an adapter rocker arm (9), a lower steel cable section (10) and a lower tension spring (11); wherein the content of the first and second substances,
the locking support arm (4), the pawl (6) and the switching rocker arm (9) are all rotationally connected in the box body (1);
one end of the upper steel cable (3) is connected with a handle on the steering column, the other end of the upper steel cable is connected with the first end of the locking support arm (4), and a clamping groove for clamping the pawl (6) is formed in the locking support arm (4);
when the mechanical control box is locked, the first end of the pawl (6) is clamped in the clamping groove of the locking support arm (4), and the second end of the pawl (6) is connected with the lifting hook throwing mechanism through the lower steel cable (10); the first end of the pawl (6) is also connected with the first end of an upper tension spring (8), the first end of a lower tension spring (11) is connected with a pin which is fixed on the box body (1) and is arranged close to the pawl (6), the second ends of the upper tension spring (8) and the lower tension spring (11) are respectively connected with the two ends of the switching rocker arm (9), and the upper tension spring (8) and the lower tension spring (11) are arranged in parallel up and down;
when the mechanical control box is opened, an operator upwards pulls the upper steel cable (3) through the handle to drive the locking support arm (4) to rotate upwards, the pawl (6) is released, the pawl (6) rotates under the action of the tensile force of the upper tension spring (8) and the lower tension spring (11), and the lower steel cable (10) drives the lifting hook throwing mechanism to move to open the lifting hook.
2. A machine control pod according to claim 1, wherein the axis of rotation of the transfer rocker (9) is at the midpoint of its length.
3. Machine control box according to claim 1, characterised in that the upper (8) and lower (11) tension springs are made of 70 steel wires with a diameter of 2.5mm, a length of 62mm and an outer diameter of 18 mm.
4. A machine control box according to claim 3, characterized in that the effective number of turns of said up (8) and down (11) tension springs is 12.75 and the spring constant k is 8.21N/mm.
5. The machine control pod of claim 1, further comprising: a reset handle (2);
the reset handle (2) is positioned outside the box body (1) and connected with a rotating shaft of the pawl (6) and used for driving the pawl (6) to reset.
6. The machine control pod of claim 1, further comprising: a return spring (5);
the first end of the locking support arm (4) is also connected with the first end of the return spring (5), and the second end of the return spring (5) is fixedly connected to the box body (1).
7. The machine control pod of claim 6, further comprising: a balance tension spring (7);
the second end of the locking support arm (4) is connected with the first end of the balance tension spring (7), and the second end of the balance tension spring (7) is fixedly connected to the box body (1).
8. Machine control box according to claim 7, characterised in that the axis of rotation of the locking arm (4) is arranged close to the second end of the locking arm (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111537014.3A CN114313267A (en) | 2021-12-15 | 2021-12-15 | Mechanical control box with double-spring action mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111537014.3A CN114313267A (en) | 2021-12-15 | 2021-12-15 | Mechanical control box with double-spring action mechanism |
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| Publication Number | Publication Date |
|---|---|
| CN114313267A true CN114313267A (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111537014.3A Pending CN114313267A (en) | 2021-12-15 | 2021-12-15 | Mechanical control box with double-spring action mechanism |
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| CN207791166U (en) * | 2017-11-29 | 2018-08-31 | 中国直升机设计研究所 | A kind of cable control mechanism launched for outer hanging emergency machine |
| CN110723595A (en) * | 2019-11-06 | 2020-01-24 | 苏州创易技研股份有限公司 | Three-section type tension control method of servo tensioner |
| CN210715693U (en) * | 2019-08-16 | 2020-06-09 | 西安飞机工业（集团）有限责任公司 | Extension spring assembly |
| CN113702034A (en) * | 2021-08-30 | 2021-11-26 | 辽宁通用航空研究院 | Push-and-pull cable fatigue test device |
-
2021
- 2021-12-15 CN CN202111537014.3A patent/CN114313267A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006154464A (en) * | 2004-11-30 | 2006-06-15 | Olympus Corp | Tilt lens-barrel for microscope, and microscopic apparatus |
| CN105501452A (en) * | 2015-12-11 | 2016-04-20 | 中航电测仪器股份有限公司 | Cargo hook device for helicopter as well as usage method and control method of cargo hook device |
| US20170197717A1 (en) * | 2016-01-11 | 2017-07-13 | Embraer S.A. | Longitudinal lock device for cargo in aircraft, safety trigger for longitudinal lock device |
| CN207791166U (en) * | 2017-11-29 | 2018-08-31 | 中国直升机设计研究所 | A kind of cable control mechanism launched for outer hanging emergency machine |
| CN210715693U (en) * | 2019-08-16 | 2020-06-09 | 西安飞机工业（集团）有限责任公司 | Extension spring assembly |
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| CN113702034A (en) * | 2021-08-30 | 2021-11-26 | 辽宁通用航空研究院 | Push-and-pull cable fatigue test device |
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