CN216470730U - Slide pushing device used in slide detection process - Google Patents

Abstract

The utility model discloses a slide pushing device used in the slide detecting process, which comprises a limit reset structure, a pushing mechanism and a slide prepressing structure, wherein the limit reset structure enables at least one pushing claw of the pushing mechanism to automatically reset in the return process; the slide pre-pressing structure comprises a pressing unit for pre-pressing the slide on the objective table and a trigger unit for enabling the pressing unit to ascend. The utility model discloses a relay conveying of slide has improved work efficiency. Specifically, a pair of pushing claws of the pushing mechanism pushes the slide on the conveying belt to the objective table in a relay manner, and the limiting reset structure enables the pushing claws to rotate upwards in the return process of the pushing claws, so that the pushing claws are effectively prevented from touching the slide below in the return process.

Description

Slide pushing device used in slide detection process

Technical Field

The utility model relates to a slide microscopic examination field especially relates to a slide pusher for in slide testing process.

Background

The microscope is a commonly used in vitro diagnosis and detection device, and is used for magnifying and observing cells, bacteria, hyphae and the like in body fluid (such as leucorrhea, blood, urine, sputum and the like) of a patient clinically to judge, and provides a basis for clinical diagnosis. The traditional microscope microscopic examination needs manual film reading, namely, the microscope is manually operated to analyze and judge images, however, each sample slide needs to be focused and photographed for comparison for many times, the operation is complicated, the consumed time is long, the confusion phenomenon easily occurs when a plurality of different slides are processed, the cross contamination between samples is caused, and the accuracy of clinical diagnosis results is influenced.

At present, a full-automatic microscope appears in the market, and adopts a distributed control technology and a modular embedded structure to realize the XYZ three-axis control of an object stage and the automatic adjustment of the brightness of a light source, and realize the automatic panoramic scanning, the automatic picture arrangement, the automatic return and the like through software. The existing full-automatic microscope realizes automatic focusing and automatic photographing, improves the slide reading efficiency to a certain extent, still needs manual slide placement, and cannot realize automatic processing of slides.

To solve the above-described problems, the applicant has developed a slide conveying apparatus that conveys slides using a conveyor belt. However, pushing the slide from the conveyor belt onto the stage and then from the stage to the exit end of the conveyor belt is the basis for automated slide transport. Therefore, how to design a slide pushing device matched with a conveying belt is a key technology which needs to be solved urgently in the industry.

Disclosure of Invention

An object of the utility model is to provide a slide pusher for in slide testing process can not only with slide propelling movement to objective table on, can also realize the pre-compaction of slide on the objective table, has improved the stability of waiting to examine the slide.

In order to achieve the above purpose, the utility model adopts the following technical proposal:

the slide pre-pressing device comprises a limiting reset structure, a pushing mechanism and a slide pre-pressing structure, wherein the pushing mechanism is used for pushing a slide to an object stage, the slide pre-pressing structure is used for fixing the slide on the object stage, and at least one pushing claw of the pushing mechanism automatically resets in the return process; the slide pre-pressing structure comprises a pressing unit for pre-pressing the slide on the objective table and a triggering unit for releasing the pressing unit.

The utility model discloses an in the preferred embodiment, push mechanism includes the installation element of vertical setting, the last propelling movement subassembly that is driven by linear power source that sets up of installation element, propelling movement subassembly is along the guide unit level on the installation element round trip movement.

The utility model discloses an in the preferred embodiment, the installation unit is the riser of vertical setting, the straight line power supply is including setting up motor and synchronous belt drive on the riser are vice, the motor with the vice action wheel transmission of synchronous belt drive is connected.

In a preferred embodiment of the present invention, the pushing assembly comprises

The bottom of the connecting unit is fixedly connected to a synchronous belt of the synchronous belt transmission pair;

the sliding unit is horizontally arranged at the upper part of the connecting unit, and the bottom of the sliding unit is clamped on the guide unit so as to enable the sliding unit to horizontally move back and forth along the guide unit; and

the pushing unit is provided with a fixing piece and a pair of pushing claws, the fixing piece is fixedly connected to the sliding unit, the fixing piece is provided with a pair of symmetrically arranged mounting holes, each pushing claw is hinged to each mounting hole, and the lower portion of each pushing claw extends downwards to form the mounting hole.

The utility model discloses an in the preferred embodiment, a tip of riser is provided with and is used for detecting the initial position's of propelling movement claw initial position origin sensor, be provided with on the linkage unit and be used for triggering origin sensor's response piece.

In the preferred embodiment of the present invention, the guiding unit is a horizontally disposed guiding rail on the vertical plate, and a first limiting member is disposed on the vertical plate on both sides of the guiding rail for limiting the movement stroke of the pushing claw.

The utility model discloses an in the preferred embodiment, spacing reset structure includes spacing seat, a pair of spacing groove unanimous with slide direction of delivery is seted up to the symmetry on the spacing seat, every the outlet end portion of spacing groove all is provided with and is used for the restriction the spacing unit of propelling movement claw return motion.

In a preferred embodiment of the present invention, a mounting groove is formed on an upper surface of the limiting seat adjacent to the limiting groove, the limiting unit includes a second limiting member rotatably disposed on a bottom wall of the mounting groove through a connecting member, and a long side of the second limiting member extends into the limiting groove; and a first reset piece which enables the second limiting piece to automatically reset is arranged on the bottom wall of the mounting groove on the connecting piece.

In a preferred embodiment of the present invention, the trigger unit comprises a trigger disposed on the compressing unit and a guide disposed on the pushing mechanism, the compressing unit rises to separate from the object stage when the trigger is clamped in the guide, and the compressing unit descends to reset after the trigger is separated from the guide to pre-press the slide on the object stage;

the pressing unit comprises a lifting piece arranged in the objective table through a guide part, a pair of pressing pieces used for pressing the glass slide are symmetrically arranged at the front end part and the rear end part of the lifting piece, and the pressing part of each pressing piece is positioned above the objective table.

The utility model discloses an in the preferred embodiment, the guide part includes the guiding axle of a plurality of vertical settings, every all the cover is equipped with the messenger on the guiding axle compress tightly a self-righting's second piece that resets.

The utility model discloses the advantage lies in having erect push mechanism and spacing reset structure above the conveyer belt, has realized the relay conveying of slide, has improved work efficiency. Specifically, a pair of pushing claws of the pushing mechanism pushes the slide on the conveying belt to the objective table in a relay manner, and the limiting reset structure enables the pushing claws to rotate upwards in the return process of the pushing claws, so that the pushing claws are effectively prevented from touching the slide below in the return process.

The utility model discloses set up slide pre-compaction structure on the objective table, realized the pre-compaction of slide on the objective table, improved the stability of slide, prevent external factor to the interference of slide, further guarantee the effect of shooing of slide.

Drawings

Fig. 1 is a schematic structural diagram of the pushing mechanism of the present invention.

Fig. 2 is an enlarged view of the pushing assembly of fig. 1.

Fig. 3 is a schematic view of the limiting and resetting structure of the present invention.

Fig. 4 is an internal structure schematic diagram of the limiting and resetting structure of the present invention.

Figure 5 is a schematic view of the attachment of the slide pre-press mechanism to the stage.

Fig. 6 is a front view of fig. 5.

Fig. 7 is an exploded view of fig. 6.

FIG. 8 is a view showing the state of the slide transfer device according to the present invention mounted thereon (the pushing claw is at the origin position).

FIG. 9 is a view showing the installation relationship of the present invention on the slide glass conveying apparatus (the pushing claw is located above the stage).

Detailed Description

The following describes embodiments of the present invention in detail with reference to the drawings, which are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are provided, but the scope of the present invention is not limited to the following embodiments.

As shown in fig. 1, the slide pushing device for slide detecting process of the present invention includes a limiting reset structure, a pushing mechanism for pushing a slide onto a stage F and a slide pre-pressing structure for pressing the slide onto the stage F, wherein the limiting reset structure not only enables two pushing claws 306 of the pushing mechanism to successfully avoid the slide below in the return process, but also enables the two pushing claws 306 to automatically fall and automatically reset after successfully avoiding the slide, so as to facilitate pushing the next slide;

the slide pre-pressing structure comprises a pressing unit and a triggering unit, when a triggering piece of the triggering unit is clamped in a guiding piece (namely a guiding block 607 described later), the pressing unit is lifted upwards for a certain distance so that the slide pushing mechanism can push the slide to the objective table; when the trigger piece of the trigger unit is separated from the guide piece, the pressing unit automatically resets to further press the slide, so that the prepressing of the slide is realized, and the stability of the slide is improved.

As shown in fig. 1-2, the pushing mechanism includes a vertically arranged mounting unit, a pushing assembly driven by a linear power source is arranged on the mounting unit, and the pushing assembly horizontally reciprocates along a guiding unit on the mounting unit;

the mounting unit comprises a vertical plate 101 which is vertically arranged and a pair of corner fittings 102 which are symmetrically arranged on the vertical plate 101, and the pushing mechanism can be integrally mounted on the fixed base body through the corner fittings 102; the vertical plate 101 is provided with lightening holes, so that the total amount of the pushing mechanism is reduced;

the guide unit comprises a guide rail 103 fixedly connected to the top of the vertical plate 101 and first limiting parts arranged on two sides of the guide rail 103, the first limiting parts are limiting blocks 104 in L-shaped structures and can limit the movement stroke of the pushing assembly to prevent the pushing assembly from falling off from the guide rail 103;

the linear power source comprises a motor (preferably a stepping motor) and a synchronous belt transmission pair which are arranged on the vertical plate 101; the synchronous belt transmission pair comprises a driving wheel 201 and an inertia wheel 202 which are rotatably arranged at the left end and the right end of the vertical plate 101, and a synchronous belt 203 wound on the driving belt wheel and the inertia wheel 202, wherein a motor shaft of the motor is in transmission connection with the driving wheel 201 (the driving wheel 201 can be sleeved on the motor shaft, and a wheel shaft of the driving wheel 201 can also be in transmission connection with the motor shaft).

As shown in fig. 1-2, the push assembly includes

The connecting unit comprises a connecting plate 301 and an upper clamping plate 302 which are vertically arranged, a lower clamping plate which horizontally extends is arranged at the lower part of the connecting plate 301, the upper clamping plate 302 is positioned at a positioning groove matched with the synchronous belt 203, the upper clamping plate 302 is clamped on the upper surface of the synchronous belt 203, the lower clamping plate is positioned at the lower surface of the synchronous belt 203, the upper clamping plate 302 and the lower clamping plate are fixedly connected together through screws, and the fixed installation of the connecting unit and the synchronous belt 203 is realized;

the sliding unit comprises a connecting block 303 horizontally arranged at the upper part of the connecting plate 301 and a sliding block 304 fixedly connected at the bottom of the connecting block 303, the lower surface of the sliding block 304 is provided with a clamping groove matched with the guide rail 103, the clamping groove of the sliding block 304 is slidably clamped on the guide rail 103, and the motor drives the sliding unit to move left and right along the guide rail 103 through a synchronous belt 203 and the connecting unit; and

a pushing unit including a fixing member (being a mounting plate 305) attached to one end of the slider 304, the mounting plate 305 having a U-shaped groove for facilitating observation of the slide below; the edges of the walls of the U-shaped grooves are provided with mounting holes 307, the upper parts of the pushing claws 306 are rotatably arranged in the mounting holes 307 through pin shafts, and the heights of the lower parts of the pushing claws 306 are slightly lower than those of the lower glass slides so as to push the lower glass slides conveniently.

As shown in fig. 1, an origin sensor 401 is disposed at the right end of the vertical plate 101, a sensing element (a sensing sheet 402) for triggering the origin sensor 401 is disposed on the connecting plate 301, and when the sensing sheet 402 moves to the position of the origin sensor 401 rightwards under the driving of the pushing assembly, the origin sensor 401 triggers and transmits a detected pushing claw 306 in place signal to the control system, so as to control the motor to push the next slide.

As shown in fig. 3-4, the limiting and resetting structure includes a limiting seat 501, a pair of limiting grooves 502 consistent with the slide conveying direction are symmetrically formed on the limiting seat 501, and an outlet end of each limiting groove 502 is provided with a limiting unit.

As shown in fig. 3-4, mounting grooves are formed on the upper surface of the limiting seat 501 close to each limiting groove 502, a limiting unit is arranged in each mounting groove, and the limiting unit comprises a connecting piece and a second limiting piece (the second limiting piece is a limiting plate 503 with a strip structure) rotatably arranged on the bottom wall of the mounting groove through the connecting piece; the connecting piece is a connecting screw 504 with an optical axis section and a thread section, the lower part of the connecting screw 504 is fixedly connected with the bottom wall of the mounting groove, and the limiting plate 503 is in rotating fit with the connecting screw 504;

a reset piece which enables the limiting plate 503 to automatically reset is arranged on the bottom wall of the mounting groove close to the connecting screw 504, the reset piece comprises a screw 506 and a reset torsion spring 507 sleeved on the screw 506, and one end of the reset torsion spring is connected with the limiting plate 503; when the limiting plate 503 rotates towards the mounting groove, the reset torsion spring is in a stressed state, and when the thrust applied to the limiting plate 503 disappears, the reset torsion spring drives the limiting plate to automatically reset;

one long edge of the limiting plate 503 is obliquely arranged, the oblique edge of the limiting plate plugs the outlet end part of the limiting groove 502, when the pushing claw 306 pushes the slide to the left, the pushing claw 306 can push the limiting plate 503 open, so that the free end part of the limiting plate 503 moves to the mounting groove, and the pushing claw 306 can pass through the mounting groove smoothly; when the pushing claw 306 returns, the pushing claw 306 can be effectively prevented from pushing the limiting plate 503 away to affect the slide below;

as shown in fig. 4, to further limit the rotation angle of the left end (i.e. the free end) of the limiting plate 503, the left end of the mounting groove is fixed to a limit stop 505 in an L-shaped configuration by a screw, and the limiting plate 503 can be clamped inside the limit stop 505 during the moving process, so that the limiting plate 503 is limited by the vertical portion of the limit stop 505. The pushing claw 306 moves leftwards along the limiting groove 502 (i.e. moves towards the direction of the object stage F), the pushing claw 306 transmits force to the limiting plate 503 to make it rotate towards the direction of the mounting groove, so that the pushing claw 306 smoothly moves out of the limiting groove 502, and the pushing claw 306 can push the pushed slide to the object stage F; when the pushing claw 306 returns, the pushing claw 306 rotates clockwise and upwards by a certain angle due to the resistance of the limiting plate 503, and automatically falls down and resets under the self-weight action after crossing the limiting plate 503 so as to push the next slide.

As shown in fig. 5-7, the slide pushing device of the present invention further includes a slide pre-pressing structure for fixing the slide at the microscopic examination station (i.e. the stage F), wherein the slide pre-pressing structure includes a pressing unit and a triggering unit;

the front side and the rear side of the objective table F are respectively provided with a mounting through hole, the compaction unit comprises a lifting piece (namely a lifting plate 601) arranged in the objective table through a guide part, the front end part and the rear end part of the lifting plate 601 respectively extend out of the mounting through holes, the front end part and the rear end part of the lifting plate 601 are provided with a pair of pressing blocks 602 with the same structure, the pressing blocks 602 are in an L-shaped structure, the end part of the horizontal section of the pressing blocks is provided with a compaction table 603, and the compaction table 603 of each pressing block 602 is positioned above the objective table F;

the guide part comprises four guide shafts 604 which are vertically arranged, the front end part and the rear end part of the lifting plate 601 are respectively provided with two guide shafts 604, the upper part of each guide shaft 604 penetrates through the objective table F, and a second reset piece (preferably a compression spring 605) is sleeved on each guide shaft 604; in order to ensure the lifting stability of the lifting plate 601, a buffer pad 606 is disposed on the bottom hole wall of each mounting through hole.

As shown in fig. 1 and 5-7, the trigger unit includes a trigger member and a guide block 607 fixedly connected to the lower surface of the sliding block 304, the guide block 607 is provided with a guide groove, the trigger member includes a fixing screw and a bearing 608 sleeved on the fixing screw, the fixing screw is disposed on the pressing block 602 located on the front side, and the height of the guide groove is slightly higher than the bearing 608 (the height of the compression spring 605 without force). When the pushing assembly moves to the stage F, the bearing 608 is clamped on the guide block 607, and since the height of the guide groove is slightly higher than the initial height of the bearing 608, the guide block 607 drives the bearing 608 to lift upwards by a certain height, and the pressing block 602 rises synchronously with the bearing 608, so that the slide enters the stage F; the pushing assembly continues to move leftwards, so that the bearing 608 is separated from the guide block 607, the bearing 608 drives the pressing block 602 to automatically descend and reset under the action of the compression spring 605, and then the two short sides of the slide are fixed, and the stability of the slide is ensured.

When the slide glass pushing device is installed, the limiting and resetting structure of the slide glass pushing device is erected above the conveying mechanism close to the objective table F, and the pushing claw 306 of the pushing mechanism can return to the position between the limiting and resetting structure and the objective table F to push the slide glass, as shown in fig. 8-9; the pushing mechanism can also trigger the slide pre-pressing structure to realize pre-pressing and liberation of the slide so as to facilitate photographing detection of the slide and abandonment conveying of the slide.

In operation, the push pawl 306 is positioned above the stage during pushing to ensure that the slide on the slide delivery device moves closer to the stage, as shown in particular in FIG. 9;

when the slide moves to the output end along with the conveying belt of the slide conveying device, the motor drives the two pushing claws 306 to move rightwards along the limiting grooves 502 respectively through the connecting unit and the sliding unit, so that the pushing claws 306 move to the original point position until the original point sensor detects the signal of the induction sheet, and the positions of the pushing claws are as shown in fig. 8;

the motor drives the pushing claw 306 to move leftwards, when the pushing claw 306 moves to the limit plate 503, the pushing claw 306 pushes the limit plate 503 to move towards the mounting groove, so that the pushing claw 306 smoothly passes through the limit groove 502;

the pushing claw 306 drives the slide to move leftwards continuously, after the bearing 608 enters the guide groove from the left end of the guide block 607, because the position of the guide block 607 is slightly higher than the initial height of the bearing 608, the guide block 607 drives the bearing 608 to lift upwards by a certain height, so that the two pressing blocks 602 are lifted upwards by a certain height, and a certain height difference exists between the pressing blocks and the object stage, so that the slide enters the object stage F under the driving of the pushing claw 306;

the pushing claw 306 continues to move leftwards, the guide block 607 moves away from the bearing 608, the pressing blocks 602 and the lifting plate 601 descend and reset under the action of the compression spring 605, and the two pressing blocks 602 respectively press one short side of the slide to fix the slide, as shown in fig. 8 specifically;

after the slide detection is finished, the motor rotates in the opposite direction to enable the pushing claw 306 to move rightwards, the pushing claw 306, the sliding unit and the guide block 607 synchronously move rightwards, when the guide block 607 moves rightwards to the position of the bearing 608, the bearing 608 enters the guide groove from the right end of the guide block 607, the guide block 607 drives the bearing 608 to move upwards by a certain height, the pressing block 602 moves upwards by a certain height, the detected slide is loosened, and the slide moves rightwards continuously to the designated recovery position along with the conveying belt;

the pushing claw 306 and the guide block 607 continue to move rightwards, so that the bearing 608 is separated from the guide block 607, and the pressing block 602 automatically resets; when the pushing claw 306 moves rightwards to the position of the limiting groove 502, the pushing claw 306 turns upwards due to the resistance of the limiting plate 503, and the pushing claw 306 is prevented from contacting the slide passing through the lower part of the limiting groove 502 during the return process; after the pushing claw 306 passes over the limiting plate 503, the pushing claw 306 automatically falls into the limiting groove 502 under the action of gravity, so that the pushing claw is in the initial position as shown in fig. 9, so as to push the next slide.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in fig. 1), and if the specific posture is changed, the directional indicator is changed accordingly. In the present invention, unless otherwise expressly stated or limited, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B," including either the A or B arrangement, or both A and B satisfied arrangement. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Claims (10)

1. A slide pusher apparatus for use in a slide testing process, comprising: the glass slide pre-pressing device comprises a limiting reset structure, a pushing mechanism and a glass slide pre-pressing structure, wherein the pushing mechanism is used for pushing a glass slide to an object stage, the glass slide pre-pressing structure is used for fixing the glass slide on the object stage, and at least one pushing claw of the pushing mechanism is automatically reset in the return process by the limiting reset structure; the slide pre-pressing structure comprises a pressing unit for pre-pressing the slide on the objective table and a triggering unit for releasing the pressing unit.

2. The slide pushing device for use in a slide testing process according to claim 1, wherein: the pushing mechanism comprises a vertically arranged mounting unit, a pushing assembly driven by a linear power source is arranged on the mounting unit, and the pushing assembly horizontally moves back and forth along a guide unit on the mounting unit.

3. The slide pushing device for use in a slide testing process according to claim 2, wherein: the installation unit is a vertical plate which is vertically arranged, the linear power source comprises a motor and a synchronous belt transmission pair which are arranged on the vertical plate, and the motor is in transmission connection with a driving wheel of the synchronous belt transmission pair.

4. The slide pushing device for use in a slide testing process according to claim 3, wherein: the pushing assembly comprises

The bottom of the connecting unit is fixedly connected to a synchronous belt of the synchronous belt transmission pair;

the sliding unit is horizontally arranged at the upper part of the connecting unit, and the bottom of the sliding unit is clamped on the guide unit so as to enable the sliding unit to horizontally move back and forth along the guide unit; and

the pushing unit is provided with a fixing piece and a pair of pushing claws, the fixing piece is fixedly connected to the sliding unit, the fixing piece is provided with a pair of symmetrically arranged mounting holes, each pushing claw is hinged to each mounting hole, and the lower portion of each pushing claw extends downwards to form the mounting hole.

5. The slide pushing device for use in a slide testing process according to claim 4, wherein: an origin sensor for detecting the original position of the pushing claw is arranged at one end of the vertical plate, and an induction piece for triggering the origin sensor is arranged on the connecting unit.

6. The slide pushing device for use in a slide testing process according to claim 3, wherein: the guide unit is a guide rail horizontally arranged on the vertical plate, and first limiting parts for limiting the movement stroke of the pushing claw are arranged on the vertical plates positioned on two sides of the guide rail.

7. The slide pushing device for use in a slide testing process according to claim 1, wherein: the limiting reset structure comprises a limiting seat, a pair of limiting grooves consistent with the glass slide conveying direction are symmetrically formed in the limiting seat, and limiting units used for limiting the return movement of the pushing claw are arranged at the outlet end parts of the limiting grooves.

8. The slide pushing device for use in a slide testing process according to claim 7, wherein: the upper surface of the limiting seat close to the limiting groove is provided with a mounting groove, the limiting unit comprises a second limiting part which is rotatably arranged on the bottom wall of the mounting groove through a connecting piece, and one long edge of the second limiting part extends into the limiting groove; and a first reset piece which enables the second limiting piece to automatically reset is arranged on the bottom wall of the mounting groove on the connecting piece.

9. The slide pushing device for use in a slide testing process according to claim 1, wherein: the trigger unit comprises a trigger piece arranged on the pressing unit and a guide piece arranged on the pushing mechanism, when the trigger piece is clamped in the guide piece, the pressing unit rises to be separated from the objective table, and when the trigger piece is separated from the guide piece, the pressing unit descends to reset to pre-press the slide on the objective table;

the pressing unit comprises a lifting piece arranged in the objective table through a guide part, a pair of pressing pieces used for pressing the glass slide are symmetrically arranged at the front end part and the rear end part of the lifting piece, and the pressing part of each pressing piece is positioned above the objective table.

10. The slide pushing device for use in a slide testing process according to claim 9, wherein: the guide part comprises a plurality of vertically arranged guide shafts, and each guide shaft is sleeved with a second reset piece for enabling the pressing piece to reset automatically.

Images