Intelligent solvent distribution device for laboratory

Abstract

The invention relates to the technical field of laboratory solvent distribution, in particular to a laboratory intelligent solvent distribution device which is characterized in that a distribution block is mounted at the rotating end of a rotating distribution frame, a fitting plate is placed on the inner wall of the distribution block, an abutting block is mounted on the inner wall of the other side of the distribution block, and a pushing block is mounted in the distribution block; by means of the device, the action of manually pinching and pressing the rubber burette can be replaced, the problem existing in intelligent solvent distribution achieved through the rubber burette is solved, a traditional rubber burette is more convenient to carry out titration solvent distribution, the efficiency is improved, and the labor intensity of workers is reduced. The experimental test efficiency is greatly improved; after titration distribution of the rubber burette is completed, the liquid level of the lowest side of the solvent can be automatically and slightly moved upwards, so that no solvent is dropped on the rubber burette, and no solvent is dropped on an operation table in the distribution process.

Description

Technical Field

[0001] The invention relates to the technical field of laboratory solvent distribution, and in particular to an intelligent solvent distribution device for a laboratory. Background Art

[0002] Before performing functional testing on a chip in the laboratory, it may be necessary to use a chemical solution for cleaning or pretreatment to ensure that the chip surface is clean. When mixing the chemical solution, a solvent dispensing device is required for precise dispensing.

[0003] China Patent Network has published a publication number: CN202320996664.2, which discloses a burette stand, including a base and a support rod connected to the base, and a support frame, the support frame including a support frame body, a columnar connector and a plurality of support members, the columnar connector is located at the center of the support frame body, and is connected to the end of the support rod away from the base, the support member is fixed to the outer ring of the support frame body, and the support member is provided with a sliding hole that runs through its upper and lower surfaces, and a moving member is slidably connected in the sliding hole for clamping the burette, and the moving member includes a middle connecting column and a clamping member fixed to the upper part of the connecting column, and an upper mounting seat and a lower mounting seat movably connected to the connecting column. Through the above design, the utility model has a simple structure and is easy to process. The key is that while satisfying the simultaneous titration of multiple burettes at one time, it can also avoid collisions between two adjacent burettes during use, reducing the economic losses caused by collisions and improving the overall efficiency of the experiment.

[0004] When intelligent solvent distribution is adopted, the driving rotation of the support and the liquid level monitoring are combined to realize the rotation of the burette to the top side of the measuring cup for solution distribution. However, the existing rubber burette needs to be manually squeezed at the rubber convex part to open the solution flow channel, which makes intelligent solvent distribution difficult in the channel opening structure of the burette. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In view of the above-mentioned problem that intelligent solvent distribution using a burette cannot be achieved, the present invention is proposed.

[0007] Therefore, an object of the present invention is to provide an intelligent solvent dispensing device for laboratory use.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: A laboratory intelligent solvent dispensing device, comprising a rotating dispensing frame, the rotating dispensing frame is equipped with a clamping member, the clamping member is fastened with a rubber burette, and a measuring cup is placed on one side of the rotating dispensing frame; A distribution block is installed at the rotating end of the rotating distribution rack, a bonding plate is placed on the inner wall of the distribution block, a resisting block is installed on the inner wall on the other side of the distribution block, a pushing block is installed inside the distribution block, a clamping roller is placed between the inner wall of the distribution block and the bonding plate, an anti-drip splint is installed at the bottom of the distribution block, and an arc block is installed at the bottom fixed end of the rotating distribution rack.

[0009] As a preferred solution of the intelligent solvent dispensing device for laboratory use described in the present invention, the rubber burette is composed of a glass tube, a rubber tube, a sealing ball inside the rubber tube and a glass dripper, the clamping member clamps the upper end of the rubber burette, and the rubber tube and the sealing ball are placed between the bonding plate and the abutting block.

[0010] As a preferred solution of the intelligent solvent dispensing device for laboratory use described in the present invention, wherein: an inner sliding rod is installed through the inner wall of the pushing block, a touch-pressure connecting rod is installed at one end of the inner sliding rod, and the touch-pressure connecting rod extends out of the outer wall of the dispensing block, a spring pressure block is installed at the other end of the inner sliding rod, a protrusion is installed on the outer wall of the inner sliding rod, a groove is provided on the inner wall of the pushing block, a movable rod is installed on the outer wall of the pushing block through a pin shaft, and the other end of the movable rod is connected to one end of the bonding plate through the pin shaft.

[0011] As a preferred solution of the intelligent solvent dispensing device for laboratory use of the present invention, the convex block is embedded in the groove, and the convex block has a certain sliding gap in the groove.

[0012] As a preferred solution of the intelligent solvent dispensing device for laboratory use described in the present invention, a seesaw is installed on one side of the pressing roller, and the seesaw is connected to the inner bottom wall of the dispensing block through a pin shaft, two connecting rods are installed at one end of the seesaw, one end of the two connecting rods is connected to the pressing roller, and the other end of the seesaw extends to one end of the spring pressure block, and an extended push plate is installed at the bottom of the pressing roller, and the extended push plate is located on one side of the anti-drip splint.

[0013] As a preferred solution of the intelligent solvent dispensing device for laboratory use described in the present invention, the two connecting rods are firmly fitted by the inner wall of the dispensing block, and when one end of the two connecting rods is subjected to thrust, the other end of the two connecting rods pushes the pressing roller to move, and the pin connecting the seesaw is closer to one side of the pressing roller, so that the extended end of the seesaw can easily drive the two connecting rods to move when subjected to pressure.

[0014] As a preferred solution of the intelligent solvent dispensing device for laboratory use described in the present invention, the anti-drip splint is located directly below the bonding plate, a touch panel is installed at the bottom of the dispensing block, the touch panel is located directly below the supporting block, and the anti-drip splint is connected to the bottom side of the dispensing block through a telescopic block.

[0015] As a preferred solution of the intelligent solvent dispensing device for laboratory use described in the present invention, wherein: a spring block is installed at the movable end of the telescopic block, a card slot is opened at the fixed end of the telescopic block, a trigger unlocking member is installed inside the card slot, and the trigger end of the trigger unlocking member extends to one side of the extended push plate.

[0016] As a preferred solution of the intelligent solvent dispensing device for laboratory use described in the present invention, when the extended push plate pushes the anti-drip splint to move, its spring block can eventually be embedded in the card slot and fit with the trigger unlocking piece in the card slot, and a spring is connected between the moving end and the fixed end of the telescopic block.

[0017] Beneficial Effects Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects: 1. The device can replace the manual squeezing of the rubber burette, solve the problem of intelligent solvent distribution of the rubber burette, and make it more convenient to titrate and distribute solvents with the traditional rubber burette without wasting manual time. During the titration and distribution of solvents, the staff can do other preparatory work, which greatly improves the efficiency of experimental testing; 2. After the rubber burette completes the titration and distribution, the liquid level on the lowest side of the solvent can automatically move up slightly, so that no solvent drops on the rubber burette, so that no solvent drops on the operating table during the distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 This is an overall schematic diagram of an intelligent solvent dispensing device for laboratory use.

[0020] Figure 2 This is a bottom-up schematic diagram of an intelligent solvent dispensing device for laboratory use.

[0021] Figure 3 for Figure 2 Enlarged view of point A in .

[0022] Figure 4This is a schematic diagram of a dispensing block of an intelligent solvent dispensing device for laboratory use.

[0023] Figure 5 for Figure 4 Enlarged view of point B in .

[0024] Figure 6 A schematic diagram of a push block of an intelligent solvent dispensing device for laboratory use.

[0025] Figure 7 for Figure 6 Enlarged view of point C in the figure.

[0026] Figure numerals: 1, rotating distribution rack; 11, clamping member; 12, rubber burette; 121, glass ball sealing convex part; 13, measuring cup; 2, distribution block; 21, fitting plate; 22, supporting block; 23, pushing block; 231, inner slide rod; 232, contact pressure connecting rod; 233, spring pressure block; 234, protrusion; 235, groove; 236, movable rod; 24, pressing roller; 241, seesaw; 242, second connecting rod; 243, extended push plate; 25, anti-drip splint; 251, touch plate; 252, telescopic block; 253, spring block; 254, slot; 255, trigger unlocking member; 26, arc block. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0030] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0031] Example 1 Reference Figure 1and Figure 2 , is the first embodiment of the present invention, which provides an intelligent solvent dispensing device for laboratory use, including a rotating distribution frame 1, the rotating distribution frame has a built-in rotating drive motor, and a measuring cup 13 is placed on one side and can be connected to a liquid level monitor. The rotating distribution frame 1 is controlled to rotate according to the solution distribution situation in the measuring cup 13, so as to perform the next solvent distribution. The rotating distribution frame 1 is installed with a clamping member 11, and the clamping member 11 is fastened with a rubber burette 12. A measuring cup 13 is placed on one side of the rotating distribution frame 1.

[0032] Specifically, the rubber burette 12 is composed of a glass tube, a rubber tube, a sealing ball inside the rubber tube and a glass dropper. The clamp 11 clamps the upper end of the rubber burette 12. The rubber tube and the sealing ball are placed between the bonding plate 21 and the abutment block 22. When the rubber tube is not squeezed, the solvent will not be titrated.

[0033] Operation process: different solvents are introduced into the burettes, and then each burette is fixed on the rotating distribution frame 1 through the clamp 11, and the rubber part of the burette is placed in the distribution block 2, and the measuring cup 13 is placed on the side of the arc block 26. When the solvent is distributed, the rotating distribution frame 1 drives the burette corresponding to the solvent to be distributed at this stage to move to the top of the measuring cup 13 to start titration. After the liquid level monitoring result determines that the solvent distribution is completed, the rotating distribution frame 1 moves the burette away.

[0034] Example 2 Reference Figure 1-Figure 6 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: a distribution block 2 is installed at the rotating end of the rotating distribution frame 1, a bonding plate 21 is placed on the inner wall of the distribution block 2, and a resisting block 22 is installed on the inner wall of the other side of the distribution block 2. The bonding plate 21 cooperates with the resisting block 22 so that the glass ball sealing convex part 121 is squeezed by the bonding plate 21 to produce a gap, so that the solvent can start to titrate, a pushing block 23 is installed inside the distribution block 2, a pressing roller is placed between the inner wall of the distribution block 2 and the bonding plate 21, an anti-drip splint 25 is installed at the bottom of the distribution block 2, and an arc block 26 is installed at the bottom fixed end of the rotating distribution frame 1. The anti-drip splint 25 cooperates with the touch plate 251 to flatten the rubber tube below the glass ball sealing convex part 121.

[0035] Specifically, an inner sliding rod 231 is installed through the inner wall of the pushing block 23, and a contact pressure link 232 is installed at one end of the inner sliding rod 231, and the contact pressure link 232 extends out of the outer wall of the dispensing block 2, and the contact pressure link 232 can be moved by the arc surface of the arc block 26 when rotating to the side of the measuring cup 13, and a spring pressure block 233 is installed at the other end of the inner sliding rod 231, and a protrusion 234 is installed on the outer wall of the inner sliding rod 231, and a groove 235 is provided on the inner wall of the pushing block 23, and a movable rod 236 is installed on the outer wall of the pushing block 23 through a pin shaft, and the other end of the movable rod 236 is connected to one end of the bonding plate 21 through a pin shaft.

[0036] Furthermore, the protrusion 234 is embedded in the groove 235, and the protrusion 234 has a certain sliding gap in the groove 235, so that when the inner slide rod 231 moves, it first triggers the pressing roller 24 to press the bonding plate 21 against the glass ball sealing protrusion 121, and then starts to push the bonding plate 21, ensuring that the rubber tube of the glass ball sealing protrusion 121 can be triggered to produce a gap when the bonding plate 21 moves.

[0037] Furthermore, a seesaw 241 is installed on one side of the pressing roller 24, and the seesaw 241 is connected to the inner bottom wall of the distribution block 2 through a pin shaft, and one end of the seesaw 241 is installed with a second connecting rod 242, one end of the second connecting rod 242 is connected to the pressing roller 24, and the other end of the seesaw 241 extends to one end of the spring pressure block 233. An extended push plate 243 is installed at the bottom of the pressing roller 24, and the extended push plate 243 is located on one side of the anti-drip splint 25.

[0038] Furthermore, the second connecting rod 242 is firmly fitted by the inner wall of the distribution block 2. When one end of the second connecting rod 242 is pushed, the other end of the second connecting rod 242 pushes the pressing roller 24 to move, and the pin connecting the seesaw 241 is closer to one side of the pressing roller 24, so that the extended end of the seesaw 241 can be easily pressed to drive the second connecting rod 242 to move.

[0039] The rest of the structure is the same as that of Example 1.

[0040] Operation process: during the rotation of a burette for solvent distribution, the contact-pressure connecting rod 232 is contacted and pressed by the arc surface of the arc block 26, and the contact-pressure connecting rod 232 moves to drive the inner slide rod 231 to move, and the inner slide rod 231 moves to drive the spring pressure block 233 to press on one end of the seesaw 241, so that the other end of the seesaw 241 drives the second connecting rod 242 to move, so that the pressing roller 24 on the second connecting rod 242 applies pressure to the bonding plate 21, so that the bonding plate 21 is bonded to the surface of the rubber tube, and the bonding part is the glass ball sealing convex part 121 of the rubber tube, and the pressing roller 24 moves to drive the extension push plate 243 to move, and the extension push plate 243 moves to drive the anti-drip clamping plate 25 to move, so that the rubber tube is slightly clamped and flattened by the anti-drip clamping plate 25 and the contact plate 251, and at this time the spring pressure block 233 is pressed against the rubber tube 241, and the rubber tube is slightly clamped and flattened by the anti-drip clamping plate 25 and the contact plate 251. The block 253 is embedded in the card slot 254 so that the flattening can be maintained. At this time, the protrusion 234 moves to the end of the stroke of the groove 235. After the bonding plate 21 is pressed, its pushing block 23 is pushed by the continuously moving inner slide rod 231. The movement of the pushing block 23 causes the movable rod 236 to apply a thrust to the bonding plate 21, so that the movement and pressing of the bonding plate 21 can replace the pinching of the rubber tube by human hands, so that a gap is generated at the pinching point, so that the solvent can be titrated from top to bottom. After the liquid level monitoring on one side of the measuring cup 13 determines that the solvent is completed, the rotating distribution frame 1 rotates to drive the downward burette to move to the top of the measuring cup 13. At this time, after the original distribution block 2 is not pressed by the arc block 26, its glass ball sealing protrusion 121 also relies on the elasticity of the rubber ring itself to restore the seal.

[0041] Example 3 Reference Figure 6 and Figure 7 , which is the third embodiment of the present invention. This embodiment is different from the above embodiments in that: the anti-drip splint 25 is located directly below the bonding plate 21, a touch plate 251 is installed at the bottom of the distribution block 2, the touch plate 251 is located directly below the support block 22, and the anti-drip splint 25 is connected to the bottom side of the distribution block 2 through the telescopic block 252.

[0042] Specifically, a spring block 253 is installed at the movable end of the telescopic block 252, a card slot 254 is opened at the fixed end of the telescopic block 252, a trigger unlocking member 255 is installed inside the card slot 254, and the trigger end of the trigger unlocking member 255 extends to one side of the extended push plate 243.

[0043] Furthermore, when the extended push plate 243 pushes the anti-drip clamp 25 to move, its spring block 253 can eventually be embedded in the slot 254 and fit with the trigger unlocking member 255 in the slot 254, and a spring is connected between the moving end and the fixed end of the telescopic block 252.

[0044] The rest of the structure is the same as that of Example 2.

[0045] Operation process: when the pressing roller 24 applies pressure to the laminating plate 21, the pressing roller 24 moves to drive the extended push plate 243 to move, and the extended push plate 243 moves to drive the anti-drip clamping plate 25 to move, so that the rubber tube is slightly clamped and flattened by the anti-drip clamping plate 25 and the touch plate 251. At this time, the spring block 253 is embedded in the card groove 254, so that the flattening can be maintained. After the glass ball sealing convex part 121 is sealed again, the extended push plate 243 moves back to the final position and then touches and triggers the unlocking member 255. The unlocking member 255 is triggered so that the spring block 253 is no longer locked on the card groove 254, and its spring retracts the telescopic block 252, so that the flattened rubber tube is restored. At this time, the solvent level in the rubber tube on the bottom side of the glass ball sealing convex part 121 moves up slightly to prevent the solvent from hanging on the dripper of the burette.

[0046] Working principle: Different solvents are introduced into the burettes, and then each burette is fixed on the rotating distribution frame 1 through the clamp 11, and the rubber part of the burette is placed in the distribution block 2, and the measuring cup 13 is placed on the side of the arc block 26. When the solvent is distributed, the rotating distribution frame 1 drives the burette corresponding to the solvent to be distributed at this stage to move above the measuring cup 13. During the rotation, the contact and pressure connecting rod 232 is pressed by the arc surface of the arc block 26, and the movement of the contact and pressure connecting rod 232 drives the movement of the inner slide rod 231, and the movement of the inner slide rod 231 drives the spring pressure block 233 to press on the seesaw 2 The rubber tube 241 is pressed against the rubber ball 251 and the rubber tube 241 is pressed against the rubber ball 251. The rubber tube 241 is pressed against the rubber ball 251 and the rubber ball 25 ... At this time, the protrusion 234 moves to the end of the stroke of the groove 235. After the bonding plate 21 is pressed, its push block 23 is pushed by the continuously moving inner slide rod 231. The movement of the push block 23 causes the movable rod 236 to apply a thrust to the bonding plate 21, so that the movement and pressing of the bonding plate 21 can replace the squeezing of the rubber tube by human hands, so that a gap is produced by squeezing, so that the solvent can be titrated from top to bottom. After the liquid level monitoring on one side of the measuring cup 13 determines that the solvent is finished, the rotating distribution frame 1 rotates to drive the downward burette to move above the measuring cup 13, and at this time the original After the dispensing block 2 is no longer pressed by the arc block 26, its fitting plate 21 recovers. At this time, the glass ball sealing protrusion 121 first recovers the seal by relying on the elasticity of the rubber itself. Then, during the recovery of the extended push plate 243, the extended push plate 243 touches the trigger unlocking member 255, so that the trigger unlocking member 255 pushes the spring block 253 out of the card slot 254, so that the anti-drip clamp 25 no longer slightly flattens the rubber tube. When the rubber tube recovers, the solvent level on the bottom side of the glass ball sealing protrusion 121 moves up slightly, so that the solvent will not spill onto the operating table during the rotation and displacement of the burette.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An intelligent solvent dispensing device for laboratory use, characterized in that: include, A rotating distribution rack (1), the rotating distribution rack (1) being equipped with a clamping piece (11), the clamping piece (11) being fastened with a rubber burette (12), and a measuring cup (13) being placed on one side of the rotating distribution rack (1); A distribution block (2) is installed at the rotating end of the rotating distribution frame (1), a bonding plate (21) is placed on the inner wall of the distribution block (2), a resisting block (22) is installed on the inner wall of the other side of the distribution block (2), a pushing block (23) is installed inside the distribution block (2), a pressing roller is placed between the inner wall of the distribution block (2) and the bonding plate (21), an anti-drip clamp (25) is installed at the bottom of the distribution block (2), and an arc block (26) is installed at the bottom fixed end of the rotating distribution frame (1).

2. The intelligent solvent dispensing device for laboratory use according to claim 1, characterized in that: The rubber burette (12) is composed of a glass tube, a rubber tube, a sealing ball inside the rubber tube and a glass dripper. The clamping member (11) clamps the upper end of the rubber burette (12), and the rubber tube and the sealing ball are placed between the laminating plate (21) and the abutting block (22).

3. The intelligent solvent dispensing device for laboratory use as claimed in claim 2, characterized in that: An inner sliding rod (231) is installed through the inner wall of the pushing block (23), one end of the inner sliding rod (231) is installed with a touch-pressure connecting rod (232), and the touch-pressure connecting rod (232) extends out of the outer wall of the distribution block (2), the other end of the inner sliding rod (231) is installed with a spring pressure block (233), the outer wall of the inner sliding rod (231) is installed with a protrusion (234), the inner wall of the pushing block (23) is provided with a groove (235), the outer wall of the pushing block (23) is installed with a movable rod (236) through a pin shaft, and the other end of the movable rod (236) is connected to one end of the bonding plate (21) through the pin shaft.

4. The intelligent solvent dispensing device for laboratory use as claimed in claim 3, characterized in that: The protrusion (234) is embedded in the groove (235), and the protrusion (234) has a certain sliding gap in the groove (235).

5. The intelligent solvent dispensing device for laboratory use as claimed in claim 4, characterized in that: A seesaw (241) is installed on one side of the pressing roller (24), and the seesaw (241) is connected to the inner bottom wall of the distribution block (2) via a pin shaft. Two connecting rods (242) are installed at one end of the seesaw (241), and one end of the two connecting rods (242) is connected to the pressing roller (24). The other end of the seesaw (241) extends to one end of the spring pressure block (233). An extended push plate (243) is installed at the bottom of the pressing roller (24), and the extended push plate (243) is located on one side of the anti-drip clamp (25).

6. The intelligent solvent dispensing device for laboratory use as claimed in claim 5, characterized in that: The two connecting rods (242) are firmly fitted to the inner wall of the distribution block (2). When one end of the two connecting rods (242) is pushed, the other end of the two connecting rods (242) pushes the pressing roller (24) to move. The pin connecting the seesaw (241) is closer to one side of the pressing roller (24), so that the extended end of the seesaw (241) can be easily pressed to drive the two connecting rods (242) to move.

7. The intelligent solvent dispensing device for laboratory use as claimed in claim 6, characterized in that: The anti-drip splint (25) is located directly below the laminating plate (21), a touch plate (251) is installed at the bottom of the distribution block (2), the touch plate (251) is located directly below the abutting block (22), and the anti-drip splint (25) is connected to the bottom side of the distribution block (2) via a telescopic block (252).

8. The intelligent solvent dispensing device for laboratory use as claimed in claim 7, characterized in that: The movable end of the telescopic block (252) is provided with a spring block (253), the fixed end of the telescopic block (252) is provided with a slot (254), a trigger unlocking member (255) is installed inside the slot (254), and the trigger end of the trigger unlocking member (255) extends to one side of the extended push plate (243).

9. The intelligent solvent dispensing device for laboratory use as claimed in claim 8, characterized in that: When the extended push plate (243) pushes the drip-proof clamping plate (25) to move, the elastic block (253) can eventually be embedded in the card slot (254) and fit with the trigger unlocking member (255) in the card slot (254), and a spring is connected between the movable end and the fixed end of the telescopic block (252).

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