CN111453679A

CN111453679A - Vacuum chuck type food filling machine

Info

Publication number: CN111453679A
Application number: CN202010480713.8A
Authority: CN
Inventors: 张爱琴
Original assignee: Guangzhou Guozhi Electromechanical Equipment Co ltd
Current assignee: Guangzhou Guozhi Electromechanical Equipment Co ltd
Priority date: 2020-05-30
Filing date: 2020-05-30
Publication date: 2020-07-28

Abstract

The invention provides a vacuum chuck type food filling machine, which structurally comprises a filling machine, a controller, a vacuum chuck structure, a placing frame and a base, wherein the controller is fixedly arranged in front of the filling machine and is electrically connected with the filling machine, the invention effectively avoids that eight-treasure porridge shakes in a tank body due to too large impact force when entering the tank body, so that the eight-treasure porridge can be greatly reduced to contact with a sealing ring, through the arrangement of the chuck frame structure, after a memory alloy plate is pushed out, a shielding cover can be stretched and can automatically recover without the action of external force, so that a cylinder body can be pushed outwards, the outer end of the cylinder body is propped against the inner wall of the lower end of the sealing ring of the tank body, and then the stirring generated when the eight-treasure porridge is injected into the tank body can be blocked by an expander, so that the eight-treasure porridge can be prevented from contacting with the sealing ring of the tank body, so that the gap of the sealing ring can be mildewed after the sealing ring is contacted with the eight-treasure porridge solution and is sealed.

Description

Vacuum chuck type food filling machine

Technical Field

The invention relates to the technical field of food filling, in particular to a vacuum chuck type food filling machine.

Background

Food products generally require processing and blending to match the taste to people's liking, thereby increasing the sales of the product, and some food products cannot be stored for a long time, for example: the eight-treasure gruel needs to be filled when being sold, so that the storage time of the eight-treasure gruel is prolonged, but when the eight-treasure gruel is filled, because the eight-treasure gruel at the upper end is filled into the tank body, the eight-treasure gruel at the upper end can generate small fluctuation under the stamping force of equipment injection, and is easy to contact with a sealing ring on the tank body, so that the eight-treasure gruel solution is adhered to the sealing ring, and the phenomenon that the sealing ring and the sealing ring are mildewed after the sealing ring is covered is caused.

Summary of the invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a vacuum chuck type food filling machine, which solves the problem that when eight-treasure porridge is filled, the eight-treasure porridge at the upper end can generate tiny fluctuation under the stamping force of equipment injection when the eight-treasure porridge is injected into a tank body, and is easy to contact with a sealing ring on the tank body, so that eight-treasure porridge solution is adhered to the sealing ring, and the phenomenon of mildewing can be generated at the sealing ring and the sealing ring after the sealing ring is sealed.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a food filling machine of vacuum chuck formula, its structure includes liquid filling machine, controller, vacuum chuck structure, rack, frame, controller fixed mounting is in liquid filling machine the place ahead and the electricity is connected, vacuum chuck structure inlays and installs in the controller below, the rack is installed in liquid filling machine and frame front end joint department and is passed through mechanical connection, liquid filling machine and frame structure as an organic whole, vacuum chuck structure includes bearing structure, buffer spring, sucking disc frame structure, bearing structure runs through in buffer spring, bearing structure lower extreme and sucking disc frame structure upper end are laminated mutually and are passed through mechanical connection, bearing structure upper end is inlayed and is installed in the controller lower extreme.

Preferably, the support structure includes a support shell, a riser pipe, a connecting ring, a miniature lifter and a steady flow pipe structure, the upper end of the riser pipe is bonded with the lower end of the connecting ring, the connecting ring is embedded in the support shell and is fixedly connected with the support shell, the riser pipe is embedded in the steady flow pipe and is bonded with the steady flow pipe, the steady flow pipe structure runs through the lower end of the support shell, the lower end of the miniature lifter is welded with the upper end of the steady flow pipe structure, and the upper end of the support shell is embedded in the lower end of the controller.

Preferably, the flow stabilizing tube structure comprises a first slip ring, a balance rod, a connecting disc and a flow guide tube, wherein a first slip ring inner ring is bonded with a connecting disc outer ring, the balance rod penetrates through the connecting disc, the lower end of the connecting disc is connected with the upper end of the flow guide tube through electric welding, the balance rod is welded inside a supporting shell and is parallel to each other, four groups of the balance rod are arranged, and two groups of the balance rod are arranged in each group and are of a cylindrical rod structure.

Preferably, the flow guide pipe comprises a branch pipe, a limiting ring, a column, a flow guide slope, a first baffle plate and a second baffle plate, the branch pipe and the limiting ring are cast and molded integrally, the branch pipe and the flow guide slope are of an integrated structure, the first baffle plate is welded on the upright post, the second baffle plate is welded on the upright post, the upper end of the branch pipe is welded with the lower end of the connecting disc, the first baffle plate and the second baffle plate are distributed in a vertically staggered manner, one end of the first shielding plate is flush with one end of the second shielding plate, the other end of the first shielding plate is flush with one end of the other second shielding plate, the first shielding plate and the second shielding plate have the same structure, and the first baffle plate and the second baffle plate in each guide pipe are respectively provided with four groups, two baffle plates in each group are symmetrically distributed, each first baffle plate and each second baffle plate form an arc-shaped plate structure, meanwhile, the heights of the upper ends of the first shielding plate and the second shielding plate are gradually reduced from the middle part to the two sides.

Preferably, the sucker frame structure comprises a top disc, an outer cover, a shielding device and a connecting pipe, the lower end of the top disc is welded with the upper end of the outer cover, the lower end of the connecting cover is connected with the upper end of the shielding device through an electric welding, the connecting pipe penetrates through the shielding device, the support structure penetrates through the top disc, and the connecting pipe is of a cylindrical ring structure.

Preferably, the shielding device comprises a sealing plate, a connecting column, a vacuum chassis, a shielding cover structure, a second sliding ring, a memory alloy plate and a connecting rod, wherein the lower end of the sealing plate is welded with the upper end of the connecting column, the memory alloy plate penetrates through the vacuum chassis, the second sliding ring is embedded and installed in the vacuum chassis and fixedly connected with the vacuum chassis, the lower end of the connecting column is welded with the upper end of the connecting rod, the lower end of the connecting column is welded with the upper end of the memory alloy plate, the shielding cover structure is installed below the vacuum chassis, the upper end of the sealing plate is attached to the lower end of a top plate, the number of the memory alloy plates is four, each group is provided with four plates, the four plates are arc-shaped plates under no acting force, and each group is installed on the corresponding vacuum.

Preferably, the blocking cover structure comprises a fixing ring, a blocking cover and an expander, the lower end of the fixing ring is bonded with the upper end of the blocking cover, the expander is wrapped at the lower end of the blocking cover, the lower end of the memory alloy plate penetrates through the fixing ring and is welded with the upper end of the expander, and the blocking cover has strong elasticity.

Preferably, the expander includes extension stick, barrel, return spring, slider, extension stick one end runs through in barrel one end, extend stick both ends and all weld with the slider mutually, return spring is located between the slider and is connected through the electric welding, the barrel upper end welds with memory alloy board lower extreme mutually, the slider is installed in the barrel and is passed through sliding connection, the slider is circular structure.

(III) advantageous effects

The invention provides a vacuum chuck type food filling machine. The method has the following beneficial effects:

1. according to the invention, by arranging the support structure, the eight-treasure porridge enters from the telescopic pipe, then flows downwards along the telescopic pipe, passes through the connecting disc and enters the inside of the flow guide pipe, then the eight-treasure porridge can impact the first shielding plate and the second shielding plate, and flows downwards along the first shielding plate and the second shielding plate, and the impact force of the eight-treasure porridge can be relieved through the first shielding plate and the second shielding plate, so that the eight-treasure porridge can be smoother when entering the tank body, and the eight-treasure porridge effectively avoids too large impact force when entering the tank body, so that the eight-treasure porridge shakes in the tank body, and the situation that the eight-treasure porridge solution contacts the sealing ring can be greatly reduced.

2. According to the invention, by arranging the sucker frame structure, after the memory alloy plate is pushed out, the shielding cover can be stretched, and can automatically recover without the action of external force to form an arc structure, so that the cylinder body can be pushed outwards, the sliding block can be moved towards two sides of the cylinder body, the return spring in the cylinder body can be stretched, the middle part of the expander becomes large, the outer end of the expander is propped against the inner wall of the lower end of the sealing ring of the cylinder body, after the eight-treasure porridge enters the connecting pipe from the guide pipe, and then the eight-treasure porridge is injected into the cylinder body, the generated stirring can be blocked by the expander, so that the phenomenon that the eight-treasure porridge solution contacts the sealing ring of the cylinder body, and after the sealing ring is contacted with the eight-treasure porridge solution, gaps of the eight-treasure porridge solution can get mildewed after the sealing.

Drawings

Fig. 1 is a schematic structural view of a vacuum cup type food filling machine according to the present invention;

FIG. 2 is a front view of the vacuum chuck of the present invention;

FIG. 3 is a front view of the support structure of the present invention;

FIG. 4 is a schematic structural view of a steady flow tube structure in front view;

FIG. 5 is a schematic top view of a honeycomb duct according to the present invention;

FIG. 6 is a schematic perspective view of a first shielding plate according to the present invention;

FIG. 7 is a side view of the sucker frame structure;

FIG. 8 is a front view of the shutter according to the present invention;

FIG. 9 is a schematic three-dimensional structure of a memory alloy plate according to the present invention;

FIG. 10 is a front view of the structure of the shield of the present invention;

fig. 11 is a top view of the dilator of the present invention.

In the figure: a filling machine-1, a controller-2, a vacuum chuck structure-3, a placing rack-4, a machine base-5, a support structure-31, a buffer spring-32, a chuck frame structure-33, a support shell-C1, a lifting pipe-C2, a connecting ring-C3, a micro lifter-C4, a flow stabilizing pipe structure-C5, a first sliding ring-C51, a balancing rod-C52, a connecting disk-C53, a flow guide pipe-C54, a branch pipe-541-542, a limiting ring-542, a stand-543, a flow guide slope-544, a first baffle-545, a second baffle-546, a top plate-T1, an outer cover-T2, a shelter-T3, a connecting pipe-T4, a closing plate-T31, a connecting column-T32, a vacuum chassis-T33, a shelter cover structure-T34, a support structure-31, a buffer spring-C52, The device comprises a second sliding ring-T35, a memory alloy plate-T36, a connecting rod-T37, a fixed ring-341, a shielding cover-342, an expander-343, an extension rod-431, a cylinder-432, a return spring-433 and a sliding block-434.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in figures 1 to 11:

example 1

The embodiment of the invention provides a vacuum chuck type food filling machine which structurally comprises a filling machine 1, a controller 2, a vacuum chuck structure 3, a placing frame 4 and a machine base 5, wherein the controller 2 is fixedly installed in front of the filling machine 1 and is electrically connected with the controller, the vacuum chuck structure 3 is embedded and installed below the controller 2, the placing frame 4 is installed at a connecting seam between the filling machine 1 and the front end of the machine base 5 and is mechanically connected with the connecting seam, the filling machine 1 and the machine base 5 are of an integrated structure, the vacuum chuck structure 3 comprises a support structure 31, a buffer spring 32 and a chuck frame structure 33, the support structure 31 penetrates through the buffer spring 32, the lower end of the support structure 31 is attached to the upper end of the chuck frame structure 33 and is mechanically connected with the upper end of the support structure 31, and the upper end of the support structure 31.

Wherein, support structure 31 includes a branch shell C1, rises and contracts pipe C2, go-between C3, miniature riser C4, steady flow tube structure C5, it bonds with go-between C3 lower extreme mutually to rise to contract pipe C2 upper end, go-between C3 inlays on a branch shell C1 and fixed connection, rise and contract pipe C2 and imbed on steady flow tube structure C5 and bond mutually, steady flow tube structure C5 runs through in a branch shell C1 lower extreme, miniature riser C4 lower extreme welds with steady flow tube structure C5 upper end mutually, inlay to install in controller 2 lower extreme in a branch shell C1 upper end.

The flow stabilizing tube structure C5 comprises a first slip ring C51, a balancing rod C52, a connecting disc C53 and a flow guide tube C54, the inner ring of the first slip ring C51 is bonded with the outer ring of the connecting disc C53, the balancing rod C52 penetrates through the connecting disc C53, the lower end of the connecting disc C53 is connected with the upper end of the flow guide tube C54 through electric welding, the balancing rod C52 is welded inside the supporting shell C1 and is parallel to each other, four groups of balancing rods C52 are arranged, each group is provided with two balancing rods, each group is of a cylindrical rod structure and is used for limiting the connecting disc C53, and the purpose that the connecting disc C53 can stably slide in the supporting shell C1 is achieved.

The flow guide pipe C54 includes a branch pipe 541, a limit ring 542, a column 543, a flow guide slope 544, a first shielding plate 545 and a second shielding plate 546, the branch pipe 541 and the limit ring 542 are cast integrally, the branch pipe 541 and the flow guide slope 544 are integrated, the first shielding plate 545 is welded on the column 543, the second shielding plate 546 is welded on the column 543, the upper end of the branch pipe 541 is welded with the lower end of the connection disc C53, the first shielding plate 545 and the second shielding plate 546 are distributed in a vertically staggered manner, one end of the first shielding plate 545 is flush with one end of the second shielding plate 546, the other end of the first shielding plate 545 is flush with one end of the other second shielding plate 546, the first shielding plate 545 and the second shielding plate 546 have the same structure, four groups of the first shielding plate 545 and the second shielding plate 546 are arranged in each flow guide pipe C54, each group has two shielding plates symmetrically distributed, each group has an arc-shaped structure with the second shielding plate 546, meanwhile, the heights of the upper ends of the first shielding plate 545 and the second shielding plate 546 are gradually reduced from the middle to the two sides for guiding the flow.

The specific working process is as follows:

when the eight-treasure porridge is canned, the controller 2 starts the filling machine 1, the eight-treasure porridge is filled on the vacuum suction cup structure 3 through the filling machine 1, so that the eight-treasure porridge enters from the ascending and contracting pipe C2, then flows downwards along the ascending and contracting pipe C2, passes through the connecting disc C53 and enters the inside of the guide pipe C54, then the eight-treasure porridge impacts the first shielding plate 545 and the second shielding plate 546, flows downwards along the first shielding plate 545 and the second shielding plate 546, the impact force of the eight-treasure porridge can be relieved through the first shielding plate 545 and the second shielding plate 546, then slowly flows downwards along two sides of the first shielding plate 545 and the second shielding plate 546, flows into the suction cup frame structure 33, enters the tank body from the inside the suction cup frame structure 33, so that the impact force of the eight-treasure porridge can be smoother when entering the tank body, and the eight-treasure porridge is effectively prevented from being too large, so that the eight-treasure gruel can shake in the tank body, thereby greatly reducing the contact of the eight-treasure gruel solution to the sealing ring.

Example 2

The suction disc frame structure 33 comprises a top disc T1, an outer cover T2, a shielding device T3 and a connecting pipe T4, the lower end of the top disc T1 is welded with the upper end of the outer cover T2, the lower end of the outer cover T2 is connected with the upper end of the shielding device T3 through electric welding, the connecting pipe T4 penetrates through the shielding device T3, the support structure 31 penetrates through the top disc T1, and the connecting pipe T4 is of a cylindrical ring structure and used for conducting drainage on materials.

Wherein the shutter T3 includes a sealing plate T31, a connecting column T32, a vacuum base plate T33, a shutter structure T34, a second slip ring T35, a memory alloy plate T36, and a connecting rod T37, the lower end of the sealing plate T31 is welded to the upper end of the connecting column T32, the memory alloy plate T36 penetrates through the vacuum base plate T33, the second slip ring T35 is mounted in the vacuum base plate T33 in an embedded manner and is fixedly connected thereto, the lower end of the connecting column T32 is welded to the upper end of the connecting rod T37, the lower end of the connecting column T32 is welded to the upper end of the memory alloy plate T36, the shutter structure T34 is mounted below the vacuum base plate T34, the upper end of the sealing plate T34 is attached to the lower end of the top plate T34, the memory alloy plate T34 has four groups in total, and each group has four arc plates in total, and each group is mounted on the corresponding vacuum base plate T34 and is uniformly distributed on the vacuum base plate T34 for making the shutter structure act on the memory alloy plate T34, can be unfolded outwards.

The shielding cover structure T34 includes a fixing ring 341, a shielding cover 342, and an expander 343, the lower end of the fixing ring 341 is bonded to the upper end of the shielding cover 342, the lower end of the shielding cover 342 wraps the expander 343, the lower end of the memory alloy plate T36 is penetrated through the fixing ring 341 and is welded to the upper end of the expander 343, and the shielding cover 342 has strong elasticity and can be unfolded under the action of external force.

The expander 343 comprises an extension rod 431, a cylinder 432, a return spring 433 and a sliding block 434, wherein one end of the extension rod 431 penetrates through one end of the cylinder 432, two ends of the extension rod 431 are welded with the sliding block 434, the return spring 433 is positioned between the sliding blocks 434 and is connected with the sliding blocks 434 through electric welding, the upper end of the cylinder 432 is welded with the lower end of a memory alloy plate T36, the sliding block 434 is installed in the cylinder 432 and is connected with the cylinder 432 through sliding, and the sliding block 434 is of a circular structure and used for limiting the sliding track of the extension rod 431.

The specific working process is as follows:

when the eight-treasure porridge is canned, the controller 2 starts the filling machine 1, the eight-treasure porridge is filled on the vacuum chuck structure 3 through the filling machine 1, and simultaneously the micro-lifter C4 is started to operate, so that the eight-treasure porridge enters from the ascending and contracting pipe C2, then flows downwards along the ascending and contracting pipe C2, passes through the connecting disc C53 and enters into the guide pipe C54, then the eight-treasure porridge impacts the first shielding plate 545 and the second shielding plate 546, flows downwards along the first shielding plate 545 and the second shielding plate 546, the impact force of the eight-treasure porridge can be relieved through the first shielding plate 545 and the second shielding plate 546, then flows downwards slowly along two sides of the first shielding plate 545 and the second shielding plate 546, the connecting disc C53 is driven by the micro-lifter C4 to move downwards along the balance rod C52, so that the C54 is driven to move downwards along with the guide pipe C52, therefore, the closing plate T31 connected to the flow guide tube C54 moves downward along with the flow guide tube C54, so that the connecting rod T37 pushes the memory alloy plate T36 to move downward, and when the memory alloy plate T36 is pushed out, the shielding cover 342 will be elongated, and will automatically recover to be in an arc structure without external force, so that the cylinder 432 will be pushed outward, the sliding block 434 will move to both sides of the cylinder 432, and the internal return spring 433 will also be elongated, so that the middle part of the expander 343 will become larger, and the outer end will be resisted on the inner wall of the lower end of the can body sealing ring, so that after the eight-treasure porridge enters the connecting tube T4 from the flow guide tube C54, and then when the eight-treasure porridge is injected into the can body, the generated stirring will be resisted by the expander 343.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a food liquid filling machine of vacuum chuck formula, its structure includes liquid filling machine (1), controller (2), vacuum chuck structure (3), rack (4), frame (5), controller (2) fixed mounting is in liquid filling machine (1) the place ahead and the electricity is connected, install in controller (2) below in vacuum chuck structure (3) are inlayed, rack (4) are installed in liquid filling machine (1) and frame (5) front end joint seam department and are passed through mechanical connection, liquid filling machine (1) and frame (5) structure as an organic whole, its characterized in that:

vacuum chuck structure (3) include support structure (31), buffer spring (32), sucking disc frame structure (33), support structure (31) run through in buffer spring (32), support structure (31) lower extreme and sucking disc frame structure (33) upper end are laminated mutually and are passed through mechanical connection, inlay on support structure (31) upper end and install in controller (2) lower extreme.

2. The vacuum-cup-type food filling machine of claim 1, wherein: support structure (31) include a shell (C1), rise shrink pipe (C2), go-between (C3), miniature riser (C4), steady flow tube structure (C5), it bonds with go-between (C3) lower extreme mutually to rise shrink pipe (C2) upper end, go-between (C3) inlay on a shell (C1) and fixed connection, it just bonds mutually to go into on steady flow tube structure (C5) and to go up to rise shrink pipe (C2), steady flow tube structure (C5) runs through in a shell (C1) lower extreme, welding mutually in miniature riser (C4) lower extreme and steady flow tube structure (C5) upper end, inlay in controller (2) lower extreme in a shell (C1) upper end.

3. The vacuum-cup-type food filling machine of claim 2, wherein: the flow stabilizing tube structure (C5) comprises a first slip ring (C51), a balance rod (C52), a connecting disc (C53) and a flow guide tube (C54), wherein the inner ring of the first slip ring (C51) is bonded with the outer ring of the connecting disc (C53), the balance rod (C52) penetrates through the connecting disc (C53), the lower end of the connecting disc (C53) is connected with the upper end of the flow guide tube (C54) through electric welding, and the balance rod (C52) is welded inside the supporting shell (C1).

4. A vacuum cup-type food filling machine as defined in claim 3, wherein: honeycomb duct (C54) include branch pipe (541), spacing ring (542), stand (543), water conservancy diversion slope (544), first shielding plate (545), second shielding plate (546), branch pipe (541) and spacing ring (542) are integrated casting moulding, branch pipe (541) and water conservancy diversion slope (544) structure as an organic whole, first shielding plate (545) weld on stand (543), second shielding plate (546) weld on stand (543), branch pipe (541) upper end welds with connection pad (C53) lower extreme mutually, crisscross distribution about first shielding plate (545) and second shielding plate (546) are.

5. The vacuum-cup-type food filling machine of claim 1, wherein: sucking disc frame structure (33) are including top dish (T1), dustcoat (T2), shelter from ware (T3), connecting pipe (T4), top dish (T1) lower extreme welds with dustcoat (T2) upper end, it is connected through the electric welding with shelter from ware (T3) upper end to connect dustcoat (T2) lower extreme, connecting pipe (T4) run through in shelter from ware (T3), bearing structure (31) run through in top dish (T1).

6. The vacuum-cup-type food filling machine of claim 5, wherein: the shielding device (T3) comprises a sealing plate (T31), a connecting column (T32), a vacuum chassis (T33), a shielding cover structure (T34), a second slip ring (T35), a memory alloy plate (T36) and a connecting rod (T37), wherein the lower end of the sealing plate (T31) is welded with the upper end of the connecting column (T32), the memory alloy plate (T36) penetrates through the vacuum chassis (T33), the second slip ring (T35) is embedded and installed in the vacuum chassis (T33) and fixedly connected with the vacuum chassis, the lower end of the connecting column (T32) is welded with the upper end of the connecting rod (T37), the lower end of the connecting column (T32) is welded with the upper end of the memory alloy plate (T36), the shielding cover structure (T34) is installed below the vacuum chassis (T33), and the upper end of the sealing plate (T31) is attached to the lower end of the top plate (T1).

7. The vacuum-cup-type food filling machine of claim 6, wherein: the shielding cover structure (T34) comprises a fixing ring (341), a shielding cover (342) and an expander (343), the lower end of the fixing ring (341) is bonded with the upper end of the shielding cover (342), the expander (343) is wrapped at the lower end of the shielding cover (342), and the lower end of the memory alloy plate (T36) penetrates through the fixing ring (341) and is welded with the upper end of the expander (343).

8. The vacuum-cup-type food filling machine of claim 7, wherein: the expander (343) comprises an extension rod (431), a cylinder body (432), a return spring (433) and a sliding block (434), wherein one end of the extension rod (431) penetrates through one end of the cylinder body (432), two ends of the extension rod (431) are welded with the sliding block (434), the return spring (433) is positioned between the sliding blocks (434) and connected through electric welding, the upper end of the cylinder body (432) is welded with the lower end of a memory alloy plate (T36), and the sliding block (434) is installed in the cylinder body (432) and connected through sliding.