CN110802529A

CN110802529A - Pressing mechanism

Info

Publication number: CN110802529A
Application number: CN201911072341.9A
Authority: CN
Inventors: 罗刚银; 王弼陡; 江浩; 王进贤; 宋明轩
Original assignee: Suzhou Institute of Biomedical Engineering and Technology of CAS
Current assignee: Suzhou Institute of Biomedical Engineering and Technology of CAS
Priority date: 2019-11-05
Filing date: 2019-11-05
Publication date: 2020-02-18

Abstract

The invention discloses a hold-down mechanism, comprising: bottom plate, rigid coupling are in slide rail on the bottom plate, can follow the horizontal direction and slide and set up first slider and second slider, rigid coupling on the slide rail are in first mounting panel on the first slider, can follow the vertical direction and slide and set up and be in pressure head subassembly, rigid coupling on the first mounting panel are in second mounting panel, connection on the second slider push rod subassembly on the second mounting panel, be used for the drive second slider, push rod subassembly and first slider are along the drive assembly and the connection of horizontal direction motion be used for between push rod subassembly and the first mounting panel with the horizontal motion of push rod subassembly converts into the vertical motion's of pressure head subassembly switching piece. According to the invention, the horizontal movement of the push rod assembly is converted into the vertical movement of the pressure head assembly through the switching block so as to extrude a sample, and no shielding exists above a pressed object before and after pressing, so that the operation is convenient, and the visual field is wide.

Description

Pressing mechanism

Technical Field

The invention relates to the field of pressing equipment, in particular to a pressing mechanism.

Background

The pressing mechanism has application in many scenarios or devices, and is mainly used for pressing a sample. For example, a pressure mechanism is generally provided in a droplet generator, and the main function of the pressure mechanism is to press a pressure head for supplying a gas source against a microporous chip for generating droplets, and to supply the microporous chip with a gas of positive or negative pressure to generate droplets. The existing pressing mechanism has a plurality of defects, such as: the motion stroke in the compressing process is short, so that the precise control and adjustment are inconvenient; the consistency of the plane pressing process is not high; the front pressing can not be realized through the side force application, the visual field right above the pressed object is not good, or the taking and the placing are inconvenient, etc.

Disclosure of Invention

The present invention is directed to provide a pressing mechanism, which overcomes the above-mentioned shortcomings in the prior art.

In order to solve the technical problems, the invention adopts the technical scheme that: a hold-down mechanism comprising: bottom plate, rigid coupling are in slide rail on the bottom plate, can follow the horizontal direction and slide and set up first slider and second slider, rigid coupling on the slide rail are in first mounting panel on the first slider, can follow the vertical direction and slide and set up and be in pressure head subassembly, rigid coupling on the first mounting panel are in second mounting panel, connection on the second slider push rod subassembly on the second mounting panel, be used for the drive second slider, push rod subassembly and first slider are along the drive assembly and the connection of horizontal direction motion be used for between push rod subassembly and the first mounting panel with the horizontal motion of push rod subassembly converts into the vertical motion's of pressure head subassembly switching piece.

Preferably, the push rod assembly comprises a first connecting rod, a connecting rod sleeve and a second connecting rod, wherein the first end of the first connecting rod is connected with the second mounting plate, the second end of the first connecting rod is connected with the first end of the connecting rod sleeve, and the second end of the connecting rod sleeve is connected with the first end of the second connecting rod;

the first end of the connecting rod sleeve is axially provided with a connecting rod hole for the first connecting rod to be slidably inserted, a first spring is arranged in the connecting rod hole, and a limiting groove which penetrates through the connecting rod sleeve and is communicated with the connecting rod hole is formed in the side portion of the first end of the connecting rod sleeve.

Preferably, the second end of the first connecting rod is provided with a pin hole, a limit pin is inserted into the pin hole, and two ends of the limit pin are slidably arranged in the limit groove.

Preferably, the transfer block is L-shaped and comprises a vertical part and a horizontal part, the upper end of the vertical part is rotatably connected with the second end of the second connecting rod, and the joint of the vertical part and the horizontal part is rotatably connected with the first mounting plate through a rotating shaft; the bottom surface of the vertical part is provided with a spherical jacking part.

Preferably, the pressure head assembly comprises a guide post fixedly connected to the base of the first mounting plate, a limit top plate fixedly connected to the top of the first mounting plate and located above the guide post, a first pressure head sleeved on the guide post and capable of sliding between the base of the first mounting plate and the limit top plate along the guide post, a second spring sleeved on the guide post and located between the bottom surface of the first pressure head and the base of the first mounting plate, a pressure plate fixedly connected with the pressure cylinder, and a second pressure head connected to the other end of the pressure plate;

and the first pressure head is provided with a guide hole which is communicated along the vertical direction and used for inserting the guide column.

Preferably, the middle part of the limiting top plate is provided with a mounting groove, a stop lever is arranged in the mounting groove, and the horizontal part of the transfer block is arranged between the stop lever and the upper surface of the first pressure head.

Preferably, be provided with the support on the bottom plate, support upper portion is provided with the mounting panel, the bottom surface of going up the mounting panel is provided with first opto-coupler and second opto-coupler, be provided with on the second mounting panel be used for with first opto-coupler and second opto-coupler complex opto-coupler separation blade.

Preferably, the bottom plate is further provided with a limiting block for limiting the first sliding block after moving to the end point position.

Preferably, after the driving assembly drives the first sliding block to move to the end position, the first sliding block stops moving, and the pressure head assembly reaches above the sample to be pressed; the driving assembly drives the second sliding block and the push rod assembly to move continuously, and the adapter block drives the pressure head assembly to vertically and downwards extrude a sample to be pressed.

Preferably, the driving assembly comprises a motor fixedly connected to the second mounting plate and a screw rod in driving connection with an output shaft of the motor, and the second mounting plate is provided with a threaded hole in threaded fit with the screw rod; the screw rod penetrates through the threaded hole, and two ends of the screw rod are rotatably connected with the bracket.

The invention has the beneficial effects that: according to the pressing mechanism, the horizontal movement of the push rod assembly is converted into the vertical movement of the pressure head assembly through the transfer block so as to extrude a sample, and no shielding exists above a pressed object before and after pressing, so that the pressing mechanism is convenient to operate and wide in visual field;

according to the invention, the first spring is arranged to transmit force and motion between the first connecting rod and the connecting rod sleeve, the pressing displacement is amplified through the small spring, and the pressing force can be accurately adjusted to realize pressing;

the switching block is in contact with the upper surface of the first pressure head through the spherical jacking portion, is in point-surface contact with the first pressure head all the time in the process of pressing down, adopts the point driving surface and is matched with the guide post, so that the first pressure head can be guaranteed to be pressed vertically downwards, and the pressing force is guaranteed to be stable.

Drawings

FIG. 1 is a schematic structural view of a pressing mechanism of the present invention;

FIG. 2 is a schematic cross-sectional view of the hold-down mechanism of the present invention;

FIG. 3 is a schematic view of the adapter block and the ram assembly of the present invention;

FIG. 4 is a schematic structural view of a ram assembly of the present invention;

fig. 5 is a schematic structural diagram of the transfer block of the present invention.

Description of reference numerals:

1-a bottom plate; 10-a slide rail; 11 — a first slide; 12-a second slide; 13 — a first mounting plate; 14-a second mounting plate; 15-a support; 16-an upper mounting plate; 17-a first optocoupler; 18-a second optocoupler; 19-a limiting block; 140-optical coupling baffle plate;

2, a pressure head assembly; 20-a guide post; 21-a limit top plate; 22 — a first ram; 23 — a second spring; 24-pressing plate; 25-a second ram; 26-a guide hole; 27-mounting groove; 28-a stop lever;

3-a push rod assembly; 30-a first link; 31-connecting rod sleeve; 32-a second link; 33-connecting rod hole; 34 — a first spring; 35-a limiting groove; 36-pin hole; 37-a spacing pin;

4-a drive assembly; 40, a motor; 41-a screw rod; 42-a threaded hole;

5, a transfer block; 50-a vertical portion; 51-a horizontal portion; 52-spherical jacking portion.

Detailed Description

The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

As shown in fig. 1, a pressing mechanism of the present embodiment includes: the bottom plate 1, the slide rail 10 of rigid coupling on bottom plate 1, can follow the first slider 11 and the second slider 12 of horizontal direction slip setting on slide rail 10, the first mounting panel 13 of rigid coupling on first slider 11, can follow the pressure head subassembly 2 of vertical direction slip setting on first mounting panel 13, the second mounting panel 14 of rigid coupling on second slider 12, connect the push rod subassembly 3 on second mounting panel 14, be used for driving second slider 12, push rod subassembly 3 and first slider 11 are along the drive assembly 4 of horizontal direction motion and connect the switching piece 5 that is used for converting the horizontal motion of push rod subassembly 3 into the vertical motion of pressure head subassembly 2 between push rod subassembly 3 and first mounting panel 13.

Wherein, the bottom plate 1 is further provided with a limiting block 19 for limiting the first sliding block 11 after moving to the end point position.

After the driving assembly 4 drives the first sliding block 11 to move to the end point position, the first sliding block 11 is stopped by the limiting block 19, and at the moment, the pressure head assembly 2 just reaches the upper part of the sample to be pressed; the driving component 4 drives the second sliding block 12 to drive the push rod component 3 to move continuously, and the motion of the horizontal direction of the push rod component 3 is converted into the motion of the vertical direction of the pressure head component 2 through the transfer block 5, so that the pressure head component 2 is driven to extrude downwards to be pressed to a sample, and the compression is realized.

In one embodiment, referring to fig. 1-5, push rod assembly 3 includes a first link 30, a link sleeve 31, and a second link 32, a first end of first link 30 is connected to second mounting plate 14, a second end of first link 30 is connected to a first end of link sleeve 31, and a second end of link sleeve 31 is connected to a first end of second link 32; a connecting rod hole 33 for the first connecting rod 30 to be slidably inserted is formed in the first end of the connecting rod sleeve 31 along the axial direction, a first spring 34 is arranged in the connecting rod hole 33, and a limiting groove 35 which penetrates through the connecting rod sleeve 31 and is communicated with the connecting rod hole 33 is formed in the side portion of the first end of the connecting rod sleeve 31. The second end of the first link 30 is provided with a pin hole 36, a limit pin 37 is inserted into the pin hole 36, and two ends of the limit pin 37 are slidably disposed in the limit groove 35.

Wherein, under the effect of drive assembly 4, first link 30 moves to the left, but pressure head subassembly 2 waits to press the sample top at the bottom after, and first link 30 continues to move to the left and extrudees first spring 34, continues to drive pressure head subassembly 2 downward motion extrusion sample again through first spring 34. The purpose of the first spring 34 is to amplify the pressing process, because the pressing head is a solid, the pressed sample is generally also a solid, the deformation distance of the pressing process is small, the first spring 34 is used for slowly applying the pushing force of the push rod assembly 3 to the pressed object through the spring deformation force, the distance of the whole pressing process is amplified, and the precise control of the clamping process is realized. The limiting pin 37 can only move within the length range of the limiting groove 35, so that the movement range of the first connecting rod 30 is limited, namely when the first connecting rod 30 moves to the condition that the limiting pin 37 reaches the leftmost end of the limiting groove 35, the pressure head assembly 2 reaches the lowermost end, so that the limit position of the downward movement of the pressure head assembly 2 can be limited, and the sample is prevented from being damaged due to excessive extrusion. On the other hand, when the first link 30 returns to the right, the first link 30 can drive the link cover 31 and the second link 32 to return to the right by the stopper pin 37.

Further, the adapting block 5 is L-shaped and comprises a vertical part 50 and a horizontal part 51, the upper end of the vertical part 50 is rotatably connected with the second end of the second connecting rod 32, and the joint of the vertical part 50 and the horizontal part 51 is rotatably connected with the first mounting plate 13 through a rotating shaft; when the second link 32 moves to the left, the vertical portion 50 and the horizontal portion 51 are rotated together in the counterclockwise direction, and the horizontal portion 51 presses the ram assembly 2 downward. The bottom surface of the vertical part 50 is provided with a spherical jacking part 52, and the transfer block 5 is in point-surface contact with the pressure head assembly 2 through the spherical jacking part 52 to transfer pressure.

Further, the pressure head assembly 2 comprises a guide post 20 fixedly connected to the base of the first mounting plate 13, a limit top plate 21 fixedly connected to the top of the first mounting plate 13 and located above the guide post 20, a first pressure head 22 sleeved on the guide post 20 and capable of sliding between the base of the first mounting plate 13 and the limit top plate 21 along the guide post 20, a second spring 23 sleeved on the guide post 20 and located between the bottom surface of the first pressure head 22 and the base of the first mounting plate 13, a pressure plate 24 fixedly connected to the pressure cylinder, and a second pressure head 25 connected to the other end of the pressure plate 24;

the first ram 22 is provided with a guide hole 26 which penetrates in the vertical direction and into which the guide post 20 is inserted. In this embodiment, 2

guide posts

20 and 2 guide holes 26 are included.

The adapter block 5 is in contact with the upper surface of the first pressure head 22 through the spherical jacking portion 52, and in the process that the adapter block 5 is pressed down, the adapter block is in point-surface contact with the first pressure head 22 all the time, and the guide post 20 is matched, so that the height of the first pressure head 22 can be guaranteed to be vertically pressed downwards, and the pressing force is guaranteed to be stable.

The material of the second pressing head 25 may be metal or plastic, and may be selected according to the actual application requirement. The second pressure head 25 can be internally provided with a channel structure to realize the pipeline passage function of gas or liquid, and can be connected with other gas source devices in series for use to realize the gas pressure supply. For example, in the present embodiment, the hold-down mechanism is specifically applied to a droplet generator, and the main function of the hold-down mechanism is to hold down the droplet generator

The second ram 25 is pressed against the underlying microporous chip for droplet generation and supplies a gas of positive or negative pressure to the microporous chip to generate droplets. The pressing mechanism can also be applied to other scenes, the lower surface of the second pressing head 25 can be provided with textures, and copying and transferring of the textures can be realized in the pressing process; a heating belt or other heat source device can be added in the second pressure head 25, temperature control can be provided during the pressing process, and the functions can be selectively added according to specific requirements.

Further, the middle part of the limit top plate 21 is provided with a mounting groove 27, a stop lever 28 is arranged in the mounting groove 27, and the horizontal part 51 of the switching block 5 is arranged between the stop lever 28 and the upper surface of the first pressing head 22. When the second connecting rod 32 is reset to the right, the transfer block 5 is driven to rotate clockwise, the horizontal part 51 is clamped by the stop lever 28, and therefore the transfer block 5, the pressure head assembly 2 and the first sliding block 11 are driven to move to the right for resetting.

An upper mounting plate 16 is arranged on the upper portion of the support 15, a first optical coupler 17 and a second optical coupler 18 are arranged on the bottom surface of the upper mounting plate 16, and an optical coupler blocking sheet 140 used for being matched with the first optical coupler 17 and the second optical coupler 18 is arranged on the second mounting plate 14. The positioning of the first and second positions is achieved by a first and a second optical coupler 17, 18. The first optical coupler 17 and the second optical coupler 18 are both conventional groove-type optical couplers.

In a preferred embodiment, the driving assembly 4 includes a motor 40 fixedly connected to the second mounting plate 14 and a screw rod 41 drivingly connected to an output shaft of the motor 40, and the second mounting plate 14 is provided with a threaded hole 42 in threaded engagement with the screw rod 41; the screw rod 41 passes through the threaded hole 42, and both ends thereof are rotatably connected to the bracket 15. Of course, other conventional linear motion devices may be selected for the driving assembly 4, as long as the driving function of the first and

second sliders

11 and 12 is achieved.

One working process of the pressing mechanism of the embodiment is as follows:

referring to fig. 1 and 2, when the motor 40 works, the screw rod 41 rotates to drive the second mounting plate 14 and the second slider 12 fixedly connected with the second mounting plate to move leftwards, force is transferred through the push rod assembly 3 and the transfer block 5 to drive the first slider 11, the first mounting plate 13 fixedly connected with the first slider 11 and the pressure head assembly 2 to slide leftwards, when the optical coupling blocking piece 140 reaches and blocks the first optical coupling 17, the second pressure head 25 of the pressure head assembly 2 just reaches the position right above a sample to be pressed, and the first slider 11 reaches the leftmost end and contacts with the limiting block 19 and cannot move leftwards any more; the first connecting rod 30 of the push rod assembly 3 continues to move leftwards and extrude the first spring 34, the connecting rod sleeve 31 and the second connecting rod 32 are further driven to move leftwards through the first spring 34, the second pressure head 25 of the pressure head assembly 2 is driven to move downwards through the transfer block 5 to extrude a sample, when the optical coupler blocking piece 140 reaches and blocks the second optical coupler 18, the second pressure head 25 of the pressure head assembly 2 moves to the lowest part to realize compaction, at the moment, the limiting pin 37 at the left end of the first connecting rod 30 also moves to the leftmost end of the limiting groove 35, and the second pressure head 25 cannot move downwards; when resetting, the motor 40 reverses to drive the second slide block 12, the push rod assembly 3, the transfer block 5, the first slide block 11, the pressure head assembly 2 and the like to reset rightwards, the second pressure head 25 moves upwards to reset quickly under the action of the elastic force of the second spring 23, and the second pressure head 25 takes off the sample and returns to the initial position rightwards. Through the mode that adopts two sliders, can guarantee to compress tightly the front and back, by compressing tightly the spacious in the top field of vision (pressure head subassembly 2 is in the side top of sample, can not shelter from the sample), guarantee to get and put the convenience, especially to having the object that compresses tightly of getting the put requirement, can facilitate.

While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications may readily be effected by those skilled in the art, so that the invention is not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.

Claims

1. A hold-down mechanism, comprising: bottom plate, rigid coupling are in slide rail on the bottom plate, can follow the horizontal direction and slide and set up first slider and second slider, rigid coupling on the slide rail are in first mounting panel on the first slider, can follow the vertical direction and slide and set up and be in pressure head subassembly, rigid coupling on the first mounting panel are in second mounting panel, connection on the second slider push rod subassembly on the second mounting panel, be used for the drive second slider, push rod subassembly and first slider are along the drive assembly and the connection of horizontal direction motion be used for between push rod subassembly and the first mounting panel with the horizontal motion of push rod subassembly converts into the vertical motion's of pressure head subassembly switching piece.

2. The compacting mechanism of claim 1 wherein the push rod assembly includes a first link, a link bushing, and a second link, a first end of the first link being coupled to the second mounting plate, a second end of the first link being coupled to a first end of the link bushing, and a second end of the link bushing being coupled to a first end of the second link;

3. The compressing mechanism as claimed in claim 2, wherein the second end of the first link has a pin hole, a limit pin is inserted into the pin hole, and two ends of the limit pin are slidably disposed in the limit groove.

4. The clamping mechanism of claim 3 wherein said transfer block is L-shaped and includes a vertical portion and a horizontal portion, the upper end of said vertical portion being pivotally connected to the second end of said second link, the connection between said vertical portion and said horizontal portion being pivotally connected to said first mounting plate via a pivot; the bottom surface of the vertical part is provided with a spherical jacking part.

5. The pressing mechanism as claimed in claim 4, wherein the pressing head assembly includes a guiding post fixed on the base of the first mounting plate, a limiting top plate fixed on the top of the first mounting plate and located above the guiding post, a first pressing head sleeved on the guiding post and capable of sliding along the guiding post between the base of the first mounting plate and the limiting top plate, a second spring sleeved on the guiding post and located between the bottom surface of the first pressing head and the base of the first mounting plate, a pressing plate fixed with the pressing cylinder, and a second pressing head connected to the other end of the pressing plate;

6. The pressing mechanism as claimed in claim 5, wherein an installation groove is formed in a middle portion of the top limiting plate, a stop rod is arranged in the installation groove, and a horizontal portion of the transfer block is arranged between the stop rod and an upper surface of the first pressing head.

7. The pressing mechanism as claimed in claim 1, wherein a support is arranged on the bottom plate, an upper mounting plate is arranged on the upper portion of the support, a first optical coupler and a second optical coupler are arranged on the bottom surface of the upper mounting plate, and an optical coupler blocking piece used for being matched with the first optical coupler and the second optical coupler is arranged on the second mounting plate.

8. The pressing mechanism as claimed in claim 1, wherein the bottom plate is further provided with a limiting block for limiting the movement of the first sliding block to the end position.

9. The hold-down mechanism of claim 8, wherein after the drive assembly drives the first slide to the end position, the first slide stops moving and the ram assembly reaches above the sample to be pressed; the driving assembly drives the second sliding block and the push rod assembly to move continuously, and the adapter block drives the pressure head assembly to vertically and downwards extrude a sample to be pressed.

10. The pressing mechanism as claimed in claim 1, wherein the driving assembly includes a motor fixedly connected to the second mounting plate and a screw rod drivingly connected to an output shaft of the motor, and the second mounting plate is provided with a threaded hole in threaded engagement with the screw rod; the screw rod penetrates through the threaded hole, and two ends of the screw rod are rotatably connected with the bracket.