CN114933016A

CN114933016A - Emergency unlocking device

Info

Publication number: CN114933016A
Application number: CN202210508143.8A
Authority: CN
Inventors: 赵国雍; 祝国伟; 张秋霞; 李磊; 李雨时
Original assignee: Beijing Wutian Technology Co ltd
Current assignee: Beijing Wutian Technology Co ltd
Priority date: 2022-05-10
Filing date: 2022-05-10
Publication date: 2022-08-23

Abstract

The invention provides an emergency unlocking device, which relates to the technical field of aviation and comprises an ejection assembly, a driving assembly and a latch hook assembly, wherein the ejection assembly comprises an ejection piece and a shell, and the ejection piece is suitable for being pressed into or ejected out of the shell; the driving assembly comprises a memory alloy wire; the latch hook subassembly includes spacing latch hook and spacing shifting block, and memory alloy silk one end is installed in spacing shifting block, and the other end is installed in the casing, and spacing shifting block and spacing latch hook rotate respectively to be connected in the casing, and spacing latch hook is suitable for the butt to pop out in order to restrict ejection piece in ejection piece, and spacing shifting block is suitable for the butt to rotate in order to restrict spacing latch hook in spacing latch hook. The emergency unlocking device takes the memory alloy wire as a trigger element, when the emergency unlocking device needs unlocking, the alloy wire is electrified and heated by pressing the switch, the alloy wire is preheated and contracted to drive other mechanisms to realize unlocking, and after the emergency unlocking device is unlocked, the lock hook assembly can be reset to realize repeated use.

Description

Emergency unlocking device

Technical Field

The invention relates to the technical field of aviation, in particular to an emergency unlocking device.

Background

Aerocrafts such as helicopters are equipped with emergent unlocking device usually in order to realize emergency release such as goods under the emergency, at present usually with throwing the shell as emergent unblock power original paper, in emergency, explode the inside explosive of throwing the shell, promote after the explosive explosion and promote to promote and realize the unblock. However, the mode has large unlocking impact, has destructive effect on other mechanisms, cannot be repeatedly used and is not convenient to store.

Disclosure of Invention

The invention solves the problem of how to reduce unlocking impact and avoid danger caused by initiating explosive devices such as projectile and the like.

In order to solve the above problems, the present invention provides an emergency unlocking device, including:

the ejection assembly comprises an ejection piece and a shell, and the ejection piece is suitable for being pressed into or ejected out of the shell;

a drive assembly comprising a memory alloy wire adapted to elongate or contract;

the lock hook component comprises a limiting lock hook and a limiting shifting block, one end of the memory alloy wire is arranged on the limiting shifting block, the other end of the memory alloy wire is arranged on the shell, the limiting shifting block and the limiting lock hook are respectively and rotatably connected to the shell, the limiting lock hook is suitable for abutting against the ejection piece to limit the ejection piece to eject, and the limiting shifting block is suitable for abutting against the limiting lock hook to limit the rotation of the limiting lock hook.

Optionally, the ejection member includes a sleeve and a first elastic member, one end of the first elastic member is connected to the sleeve, the other end of the first elastic member is connected to the housing, a first limiting block is arranged on one side of the sleeve, which faces the limiting lock hook, a first limiting groove is formed in the limiting lock hook, and the first limiting block is suitable for being clamped in the first limiting groove.

Optionally, a sliding block is further arranged on the sleeve, a sliding way is further arranged on the shell, and the sliding block is connected with the sliding way in a sliding mode.

Optionally, one end of the limiting shifting block, which is far away from the memory alloy wire, is provided with a second limiting groove, one end of the limiting lock hook is rotatably connected to the housing, and the other end of the limiting lock hook is suitable for abutting against the second limiting groove.

Optionally, the locking hook assembly further includes a second elastic member, one end of the second elastic member is connected to the limiting locking hook, and the other end of the second elastic member is connected to the housing.

Optionally, the latch hook assembly further includes a third elastic member, one end of the third elastic member is connected to the limiting shifting block, and the other end of the third elastic member is connected to the housing.

Optionally, the driving assembly further comprises a pulley, and the memory alloy wire is wound on the pulley.

Optionally, the drive assembly comprises at least two of said memory alloy wires.

Optionally, a plug is further disposed on the housing, and two ends of the memory alloy wire are electrically connected to the plug, respectively.

Optionally, the driving assembly further comprises a fixed seat, the fixed seat and the limiting shifting block are respectively provided with an insulating sleeve, and two ends of the memory alloy wire are respectively connected with the limiting shifting block and the fixed seat through the insulating sleeves.

When the memory alloy wire is in an extended state, the limiting shifting block can rotate clockwise under small external elasticity, so that the limiting locking hook is abutted to limit the rotation of the limiting locking hook, the limiting locking hook is abutted to an ejection piece, the ejection piece is pressed into the shell and has certain pretightening force, and the locking of the emergency unlocking device is realized; when the emergency unlocking device is in a shortened state, the memory alloy wire pulls the limiting shifting block to enable the limiting shifting block to rotate in an anticlockwise direction for example to relieve the abutting limitation of the limiting shifting block on the limiting lock hook, so that the ejection piece is not limited by the limiting lock hook and is ejected out of the shell, and the rapid unlocking of the emergency unlocking device is realized; when the memory alloy wire pulls the limiting shifting block, due to the lever principle (for example, the hinge point of the limiting shifting block and the shell is used as a fulcrum, the limiting shifting block is used as a lever, the hinge point of the limiting lock hook and the shell is used as a fulcrum, and the limiting lock hook is used as a lever), the emergency unlocking device reduces the requirement on the tension of the memory alloy wire while ensuring that the pre-tightening force of the ejection piece is larger (namely, the unlocking effect is better), and can enable the tension of the memory alloy wire to more quickly reach the required unlocking size (namely, realize quick unlocking); in addition, compared with the mode of unlocking and releasing by adopting initiating explosive devices such as projectile and the like, the emergency unlocking device has the advantages of smaller unlocking impact, repeated use, convenience in storage and maintenance and reduced pollution to the environment.

Drawings

Fig. 1 is a schematic cross-sectional view of an emergency unlocking device according to an embodiment of the present invention in a locked state;

fig. 2 is a schematic cross-sectional view of an emergency unlocking device according to an embodiment of the present invention in an unlocked state;

fig. 3 is a three-dimensional schematic view of a limiting latch hook according to an embodiment of the present invention;

fig. 4 is a three-dimensional schematic view of a limit shifting block according to an embodiment of the present invention.

Description of reference numerals:

1. an ejection assembly; 11. an ejection member; 111. a first elastic member; 112. a sleeve; 1121. a slider; 1122. a first stopper; 1123. a seal ring; 12. a housing; 121. a slideway; 122. a spring mount; 123. a plug; 2. a drive assembly; 21. memorizing alloy wires; 22. a pulley; 23. a fixed seat; 231. an insulating sleeve; 3. a latch hook assembly; 31. a lock hook is limited; 311. a first limit groove; 312. a latch hook hinge hole; 313. a limiting end; 32. a limit shifting block; 321. a second limit groove; 322. a shifting block hinge hole; 323. memory alloy wire mounting holes; 33. a second elastic member; 34. and a third elastic member.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

It should be noted that, in the coordinate system XYZ provided herein, the X-axis forward direction represents the right direction, the X-axis reverse direction represents the left direction, the Y-axis forward direction represents the rear direction, the Y-axis reverse direction represents the front direction, the Z-axis forward direction represents the upper direction, and the Z-axis reverse direction represents the lower direction. Also, it is noted that the terms "first," "second," and the like in the description and claims of the present invention and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein.

An embodiment of the present invention provides an emergency unlocking device, including: the ejection assembly 1 comprises an ejection piece 11 and a shell 12, wherein the ejection piece 11 is suitable for being pressed into or ejected out of the shell 12; the drive assembly 2 comprises a memory alloy wire 21, the memory alloy wire 21 being adapted to be elongated or shortened; the lock hook assembly 3 comprises a limiting lock hook 31 and a limiting shifting block 32, one end of the memory alloy wire 21 is installed on the limiting shifting block 32, the other end of the memory alloy wire is installed on the shell 12, the limiting shifting block 32 and the limiting lock hook 31 are respectively connected to the shell 12 in a rotating mode, the limiting lock hook 31 is suitable for abutting against the ejection piece 11 to limit the ejection piece 11 to eject, and the limiting shifting block 32 is suitable for abutting against the limiting lock hook 31 to limit the rotation of the limiting lock hook 31.

Specifically, as shown in fig. 1 and 2, the ejector 11 can be pressed or ejected from the housing 12 along the X-axis direction in the drawing, the limit latch hook 31 and the limit toggle block 32 are respectively hinged to the housing 12, and the memory alloy wire 21 has the characteristic of generating metal phase change along with temperature change, that is, can be extended or shortened.

Illustratively, referring to fig. 1, when the emergency unlocking device is in a locked state, the memory alloy wire is in an extended state, the ejector 11 is pressed into the housing 12, the limit latch hook 31 abuts against the ejector 11 to limit the ejector 11, and the lower end (i.e., the end in the direction opposite to the Z axis in the drawing) of the limit shifting block 32 abuts against the right end (i.e., the end in the direction along the X axis in the drawing) of the limit latch hook 31 to limit the rotation of the limit latch hook 31; as shown in fig. 2, when the emergency unlocking device is in the unlocking state, the memory alloy wire 21 is in the shortened state due to being electrified and heated, the memory alloy wire is shortened to cause the limit shifting block 32 to be pulled to rotate counterclockwise in the drawing, and the limit locking hook 31 is not abutted by the limit shifting block 32 any more, so that the limit locking hook 31 can rotate counterclockwise in the drawing, and the ejection piece 11 is not abutted by the limit locking hook 31 any more, so that the ejection piece 11 is ejected out of the housing 12.

When the memory alloy wire 21 is in an extended state, the emergency unlocking device enables the limiting shifting block 32 to rotate clockwise under small external elasticity, for example, and then abuts against the limiting locking hook 31 to limit the rotation of the limiting locking hook 31, so that the limiting locking hook 31 abuts against the ejection piece 11, the ejection piece 11 is pressed into the shell 12 and has a certain pretightening force, and the locking of the emergency unlocking device is realized; when the emergency unlocking device is in a shortened state, the memory alloy wire 21 pulls the limiting shifting block 32 to enable the limiting shifting block 32 to rotate in an anticlockwise direction for example to release the abutting limitation of the limiting shifting block 32 on the limiting lock hook 31, so that the ejection piece 11 is ejected out of the shell 12 without being limited by the limiting lock hook 31, and the rapid unlocking of the emergency unlocking device is realized; moreover, when the memory alloy wire 21 pulls the limit shifting block 32, due to the lever principle (for example, the hinge point of the limit shifting block 32 and the shell 12 is taken as a fulcrum, the limit shifting block 32 is taken as a lever, the hinge point of the limit locking hook 31 and the shell 12 is taken as a fulcrum, and the limit locking hook 31 is taken as a lever), the emergency unlocking device reduces the requirement on the pulling force of the memory alloy wire 21 while ensuring that the pre-tightening force of the ejection piece 11 is larger (namely, the unlocking effect is better), and can enable the pulling force of the memory alloy wire 21 to more quickly reach the required unlocking size (namely, realize quick unlocking); in addition, compared with the mode of unlocking and releasing by adopting initiating explosive devices such as projectile and the like, the emergency unlocking device has the advantages of smaller unlocking impact, repeated use, convenience in storage and maintenance and reduced pollution to the environment.

Optionally, the ejection element 11 includes a sleeve 112 and a first elastic element 111, one end of the first elastic element 111 is connected to the sleeve 112, and the other end is connected to the housing 12, a first limit block 1122 is disposed on one side of the sleeve 112 facing the limit latch hook 31, a first limit groove 311 is disposed on the limit latch hook 31, and the first limit block 1122 is adapted to be snapped into the first limit groove 311.

Specifically, as shown in fig. 1 to fig. 3, the sleeve 112 is integrally connected to the first stopper 1122, and when the emergency unlocking device is locked, the inner wall surface of the first stopper 311 and the outer wall surface of the first stopper 1122 abut against each other, so that the sleeve 112 is pressed into the housing 12 for limitation; when the emergency unlocking device is unlocked, the limiting latch hook 31 rotates counterclockwise in the figure, the inner wall on the right side of the first limiting groove 311 (i.e., the inner wall on the positive direction side of the X axis in the figure) no longer abuts against the first limiting block 1122, and the sleeve 112 can be ejected out of the housing 12 along the X axis in the figure.

For example, referring to fig. 1 to 2, a sealing ring 1123 is sleeved on a right end (i.e., an end in the positive direction of the X axis in the drawing) of the sleeve 112 to seal and protect components inside the emergency unlocking device, the first elastic element 111 may be a rectangular spring, which is located inside the sleeve 112 and has one end abutting against a right inner wall (i.e., an inner wall on the positive direction of the X axis in the drawing) of the sleeve 112 and the other end sleeved on the spring mounting seat 122 of the housing 12, wherein the spring mounting seat 122 may also be connected to the housing 12 by a fastening element.

So, the limit latch hook 31 is connected with the first limit block 1122 in a clamped manner through the first limit groove 311 to realize the abutting limit of the sleeve 112, so that the limit latch hook 31 shares the pre-tightening force of the ejection piece 11 (i.e., the pre-tightening force generated by pre-compressing the first elastic piece 111) to a certain extent, the requirement on the tension of the memory alloy wire 21 is further reduced, and the quick unlocking is convenient to realize.

Optionally, a sliding block 1121 is further disposed on the sleeve 112, a sliding rail 121 is further disposed on the housing 12, and the sliding block 1121 is connected to the sliding rail 121 in a sliding manner.

Specifically, referring to fig. 1, the emergency unlocking device is in a locked state, the first stopper 1122 on the sleeve 112 is abutted and limited by the limiting locking hook 31, and the sliding block 1121 integrally connected to the sleeve 112 is stationary relative to the sliding rail 121; referring to fig. 2, the emergency unlocking device is in an unlocking state, the limiting latch hook 31 rotates counterclockwise in the drawing and no longer abuts against the limiting first limiting block 1122, the elastic potential energy of the first elastic element 111 is converted into kinetic energy to further push the sleeve 112 toward the positive direction of the X axis, and the slide 121 is consistent with the direction of the X axis in the drawing, so that the slider 1121 and the sleeve 112 both move along the positive direction of the X axis in the drawing.

In this way, the slider 1121 and the slide rail 121 provide guidance when the ejector 11 is ejected out of the housing 12, so as to improve the accuracy of ejecting the ejector 11, and to cooperate with a device such as a percussion lock hook of a helicopter to achieve quick unlocking.

Optionally, one end of the limiting shifting block 32, which is away from the memory alloy wire 21, is provided with a second limiting groove 321, one end of the limiting locking hook 31 is rotatably connected to the housing 12, and the other end of the limiting locking hook 31 is adapted to abut against the second limiting groove 321.

Specifically, as shown in fig. 1 to 4, a memory alloy wire mounting hole 323 is formed at an upper end (i.e., an end along the positive direction of the Z axis in the drawing) of the limiting shifting block 32 for fixing one end of the memory alloy wire 21, a shifting block hinge hole 322 is formed near the center of the limiting shifting block 32 along the Z axis, the limiting shifting block 32 is hinged to the housing 12 through the shifting block hinge hole 322, and a second limiting groove 321 is formed at a lower end (i.e., an end along the negative direction of the Z axis in the drawing) of the limiting shifting block 32; the left end (i.e. the end along the negative direction of the X axis in the figure) of the position-limiting locking hook 31 is provided with a locking hook hinge hole 312, the position-limiting locking hook 31 is hinged to the housing 12 through the locking hook hinge hole 312, the right end (i.e. the end along the positive direction of the X axis in the figure) of the position-limiting locking hook is provided with a position-limiting end 313, which can abut against the wall surface of the second position-limiting groove 321, and the second position-limiting groove 321 realizes the position limitation of the position-limiting locking hook 31 by a proper friction angle.

So, when emergent unlocking device was locked, make through second spacing groove 321 butt spacing latch hook 31 can the transmission power between spacing shifting block 32 and the spacing latch hook 31, regard spacing shifting block 32 and spacing latch hook 31 respectively with the rotation tie point of casing 12 as the fulcrum, reduced the pulling force size demand to memory alloy silk 21, quick unblock when the emergent unlocking device of being convenient for unblock.

Optionally, the latch hook assembly 3 further includes a second elastic member 33, one end of the second elastic member 33 is connected to the limit latch hook 31, and the other end is connected to the housing 12.

Specifically, as shown in fig. 1 and fig. 2, the second elastic element 33 may be an extension spring, one end of which is mounted on the housing 12, and the other end of which is mounted on one end of the position-limiting latch hook 31 along the positive direction of the X axis in the figure.

Thus, when the emergency unlocking device is locked, the second elastic element 33 is subjected to the pre-stretching effect along with the limit lock hook 31 being abutted and limited by the limit shifting block 32; when the emergency unlocking device is unlocked, the limiting lock hook 31 is not limited any more, and the elastic potential energy of the second elastic part 33 is converted into kinetic energy to enable the limiting lock hook 31 to rotate more quickly, so that the ejection part 11 is unlocked and ejected, and the unlocking speed is further increased.

Optionally, the latch hook assembly 3 further includes a third elastic member 34, one end of the third elastic member 34 is connected to the limiting shifting block 32, and the other end is connected to the housing 12.

Specifically, as shown in fig. 1 and fig. 2, the third elastic element 34 may be a compression spring, one end of the compression spring is fixedly disposed on the housing 12 through a spring mounting seat, and the other end of the compression spring is disposed at the lower end (i.e., the end along the direction opposite to the Z axis in the drawing) of the limiting shifting block 32.

Thus, when the emergency unlocking device is unlocked, the limit shifting block 32 is pulled by the memory alloy wire 21 to rotate (for example, rotate in a counterclockwise direction), so that the third elastic element 34 is pre-compressed; when the emergency unlocking device is locked again, the memory alloy wire 21 is extended, and the elastic potential energy of the third elastic member 34 is converted into kinetic energy (i.e. the external elastic force is formed) so that the limiting shifting block 32 rotates reversely (for example, clockwise) relative to the unlocking time, so that the limiting shifting block 32 abuts against the limiting locking hook 31 again, the resetting of the limiting shifting block 32 is facilitated when the emergency unlocking device is locked, and the reuse of the emergency unlocking device is further facilitated.

Optionally, the driving assembly 2 further includes a pulley 22, and the memory alloy wire 21 is wound on the pulley 22.

Illustratively, as shown in fig. 1 and 2, the pulley 22 is made of an insulating material, and is mounted on the housing 12 and located on the left side of the limit moving block 32 and a fixed seat 23 (described later) to reduce the transverse dimension (i.e., the dimension in the X-axis direction in the drawing) of the emergency unlocking device, and the memory alloy wire 21 is wound around the pulley 22.

In this way, the memory alloy wire 21 is wound around the pulley 22, so that both ends of the memory alloy wire 21 face the same direction (for example, both faces the positive direction of the X axis in the figure) to connect the power supply; furthermore, the memory alloy wire 21 can be tensioned by the pulley 22, thereby shortening the time of the memory alloy wire 21 and further improving the unlocking speed.

Optionally, the driving assembly 2 comprises at least two memory alloy wires 21.

Specifically, as shown in fig. 1 and fig. 2, two memory alloy wires 21 are wound around the pulley 22, two ends of the memory alloy wires 21 are respectively connected to a fixing seat 23 (described later) and a limiting shifting block 32, and the ends of the two memory alloy wires 21 are connected to a power supply. The arrangement of more than two memory alloy wires 21, and so on, will not be described herein.

Therefore, the redundancy design is realized by arranging at least two memory alloy wires 21, the safety and reliability of the emergency unlocking device are ensured, and the safety and reliability of the aviation aircraft are further ensured.

Optionally, a plug 123 is further disposed on the housing 12, and two ends of the memory alloy wire 21 are electrically connected to the plug 123, respectively.

Illustratively, as shown in fig. 1 and 2, the plug 123 may be a four-core aviation plug electrically connected to four ends of two memory alloy wires 21.

In this way, the housing 12 is provided with the plug 123 (e.g., a four-core aviation plug) electrically connected to each of the two ends of the memory alloy wire 21, so that the memory alloy wire is suitable for circuit connection of an aviation aircraft such as a helicopter.

Optionally, the driving assembly 2 further includes a fixing seat 23, the fixing seat 23 and the limiting shifting block 32 are respectively provided with an insulating sleeve 231, and two ends of the memory alloy wire 21 are respectively connected with the limiting shifting block 32 and the fixing seat 23 through the insulating sleeves 231.

Specifically, as shown in fig. 1, fig. 2 and fig. 4, the fixing seat 23 is installed on the housing 12 to fix one end of the memory alloy wire 21, and the insulating sleeves 231 are respectively disposed on the fixing seat 23 and the limiting shifting block 32. Therefore, the memory alloy wire 21 is insulated from the fixed seat 23, the limiting shifting block 32 and the shell 12, short circuit abnormality in a circuit path where the memory alloy wire 21 is located is avoided, the safety and reliability of the emergency unlocking device are guaranteed, and the safety and reliability of the aviation aircraft are further guaranteed.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.

Claims

1. An emergency unlocking device, comprising:

the ejection assembly (1) comprises an ejection piece (11) and a shell (12), wherein the ejection piece (11) is suitable for being pressed into or ejected out of the shell (12);

a drive assembly (2), the drive assembly (2) comprising a memory alloy wire (21), the memory alloy wire (21) being adapted to elongate or contract;

the ejection mechanism comprises a lock hook component (3), the lock hook component (3) comprises a limiting lock hook (31) and a limiting shifting block (32), one end of a memory alloy wire (21) is installed on the limiting shifting block (32), the other end of the memory alloy wire is installed on the shell (12), the limiting shifting block (32) and the limiting lock hook (31) are respectively connected to the shell (12) in a rotating mode, the limiting lock hook (31) is suitable for abutting against the ejection piece (11) to limit the ejection piece (11) to eject, and the limiting shifting block (32) is suitable for abutting against the limiting lock hook (31) to limit the rotation of the limiting lock hook (31).

2. The emergency unlocking device according to claim 1, wherein the ejection member (11) comprises a sleeve (112) and a first elastic member (111), one end of the first elastic member (111) is connected to the sleeve (112), the other end of the first elastic member is connected to the housing (12), a first limiting block (1122) is arranged on one side of the sleeve (112) facing the limiting latch hook (31), a first limiting groove (311) is formed in the limiting latch hook (31), and the first limiting block (1122) is suitable for being clamped in the first limiting groove (311).

3. The emergency unlocking device according to claim 2, wherein a sliding block (1121) is further disposed on the sleeve (112), a sliding way (121) is further disposed on the housing (12), and the sliding block (1121) is slidably connected with the sliding way (121).

4. The emergency unlocking device according to claim 1, wherein a second limiting groove (321) is formed in one end, far away from the memory alloy wire (21), of the limiting shifting block (32), one end of the limiting locking hook (31) is rotatably connected to the housing (12), and the other end of the limiting locking hook (31) is suitable for abutting against the second limiting groove (321).

5. The emergency unlocking device according to claim 2, wherein the latch hook assembly (3) further comprises a second elastic member (33), one end of the second elastic member (33) is connected to the limit latch hook (31), and the other end is connected to the housing (12).

6. The emergency unlocking device according to claim 1, wherein the latch hook assembly (3) further comprises a third elastic member (34), one end of the third elastic member (34) is connected to the limit catch (32), and the other end is connected to the housing (12).

7. The emergency unlocking device according to claim 1, wherein the driving assembly (2) further comprises a pulley (22), and the memory alloy wire (21) is wound around the pulley (22).

8. The emergency unlocking device according to claim 1, characterized in that said drive assembly (2) comprises at least two of said memory alloy wires (21).

9. The emergency unlocking device according to claim 8, wherein a plug (123) is further provided on the housing (12), and both ends of the memory alloy wire (21) are electrically connected to the plug (123), respectively.

10. The emergency unlocking device according to claim 1, wherein the driving assembly (2) further comprises a fixed seat (23), the fixed seat (23) and the limiting shifting block (32) are respectively provided with an insulating sleeve (231), and two ends of the memory alloy wire (21) are respectively connected with the limiting shifting block (32) and the fixed seat (23) through the insulating sleeves (231).