Multi-channel needle type filtering device

Abstract

The invention relates to the field of filtering equipment, in particular to a multi-channel needle type filtering device which comprises a workbench, an electric lifting rod is arranged at the upper end of the workbench, a needle cylinder frame is arranged at the top end of the electric lifting rod, a plurality of positioning cavity cylinders are arranged on the needle cylinder frame at equal intervals in a penetrating mode, and needle cylinder filters are erected in the positioning cavity cylinders. A plurality of mounting grooves are formed in the upper end of the workbench at equal intervals, container bottles are arranged in the mounting grooves and located under the corresponding needle cylinder filters, each needle cylinder filter comprises a needle cylinder body, a sealing seat and a needle head, a piston is slidably arranged in each needle cylinder body, a pressing column is fixedly arranged at the top end of each piston, and a connecting seat is arranged at the bottom of each needle cylinder body; and the sealing seat is hermetically sleeved on the outer side of the connecting seat. According to the ion filtering device, the corresponding filtering membranes can be quickly replaced according to different filtered ion particles, the filtering process of different ions can be synchronously realized on the same equipment, the operation is simple, and the filtering effect is good.

Description

Technical Field

[0001] The invention relates to the technical field of filtering equipment, and in particular to a multi-channel needle-type filtering device. Background Art

[0002] Sample filtration is a commonly used laboratory technique, mainly used to remove insoluble particles from solutions in preparation for analytical samples. The main purpose of sample filtration is to concentrate or purify substances and reduce the complex components of samples. By filtering, it is possible to ensure that the sample reaches the required purity before analysis.

[0003] At present, the commonly used filtration devices in laboratories include filter paper, filter cup and filter funnel. The filter is connected to the filter funnel, and the whole device is placed under the funnel. The sample liquid is poured into the filter by squeezing or inverting. The liquid flows into the funnel through the gap between the filter paper and the filter funnel, while the solid is left on the filter paper. The above device has a simple structure and is easy to operate, but it can only filter one sample liquid at a time. At the same time, when different ion particles need to be filtered, the filter membrane needs to be replaced, and the filter cup and filter funnel need to be cleaned to prevent the sample liquid from mixing, which is inefficient. Summary of the invention

[0004] The purpose of the present invention is to provide a multi-channel needle filter device to solve the above technical problems.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A multi-channel needle filter device comprises a workbench, an electric lifting rod is arranged at the upper end of the workbench, a syringe rack is arranged at the top end of the electric lifting rod, a plurality of positioning cavities are arranged at equal intervals through the syringe rack, a syringe filter is mounted in the positioning cavity, a plurality of mounting grooves are arranged at equal intervals at the upper end of the workbench, container bottles are arranged in the mounting grooves, and the container bottles are located directly below the corresponding syringe filters.

[0007] The syringe filter includes a syringe body, a sealing seat and a needle, a piston is slidably arranged in the syringe body, a pressure column is fixedly arranged on the top of the piston, a connecting seat is arranged at the bottom of the syringe body, the sealing seat is sealingly sleeved on the outside of the connecting seat, an upper shell part is fixedly arranged at the bottom of the sealing seat, a lower shell part is arranged below the upper shell part, a cavity is formed between the upper shell part and the lower shell part, a filter membrane is adapted to be installed in the cavity, an outer sealing sleeve is sleeved on the outer circumference of the upper shell part and the lower shell part, a connecting part is arranged on the top of the needle, and the connecting part is detachably connected to the bottom end of the lower shell part.

[0008] As a further solution of the present invention: a sealing groove is circumferentially arranged on the inner wall of the sealing seat, and an annular clamping protrusion is arranged on the outer wall of the connecting seat, and the clamping protrusion is adapted to be clamped and embedded in the sealing groove.

[0009] As a further solution of the present invention: a plurality of mounting brackets are evenly spaced on one side of the syringe rack, each mounting bracket is provided with a transmission assembly, a plurality of clamping blocks for clamping the syringe filter are evenly arranged on the inner wall of the positioning cavity, and the transmission assembly cooperates with one group of the clamping blocks.

[0010] As a further solution of the present invention: extension shells are evenly arranged on the outer wall of the positioning cavity, the clamping block is slidably installed in the corresponding extension shell, and a reset spring is arranged between the clamping block and the extension shell.

[0011] As a further solution of the present invention: the transmission assembly includes a transverse tooth plate, a rotating shaft and a vertical tooth plate, a fixing rod is provided at one end of the transverse tooth plate close to the positioning cavity, the fixing rod slides through the extension shell and is fixedly connected to the corresponding clamping block, a slide rail is provided at the upper end of the transverse tooth plate, the slide rail is linearly slidably installed in the mounting bracket, the rotating shaft is rotatably matched with the mounting bracket, and a first gear and a second gear are respectively sleeved on the rotating shaft, the first gear is meshed with the bottom of the transverse tooth plate, and the second gear is meshed with one side of the vertical tooth plate.

[0012] As a further solution of the present invention: a sliding rod is fixedly provided on the upper end of the mounting bracket, an anti-slip baffle is fixedly provided on the top of the sliding rod, a support is extended on one side of the vertical tooth plate, the support is slidably installed on the sliding rod, a return spring is provided between the bottom of the support and the mounting bracket, a baffle rod is fixedly provided on the top of the support, the sliding rod slides coaxially through the baffle rod, and a contact switch is provided on the top of the baffle rod.

[0013] As a further solution of the present invention: a lifting electric rail is fixedly arranged on the mounting bracket, a pressure plate is slidably installed on the lifting electric rail, and the pressure plate is pressed against a pressure column of the corresponding syringe filter.

[0014] As a further solution of the present invention: the front end of the pressure plate is a pressing part, and the pressing part is located directly above the corresponding pressure column. A counterweight block is fixedly provided at the upper end of the pressing part, and a sliding seat is provided at the rear end of the pressure plate. The sliding seat slides with the lifting electric rail, and a limiting column is fixedly provided on one side of the pressure plate. The sliding rod coaxially slides through the limiting column, and a stop block is fixedly provided at the bottom of the limiting column, and the stop block is located directly above the contact switch.

[0015] As a further solution of the present invention: the distance between the stop block and the contact switch is consistent with the downward stroke of the piston in the syringe body.

[0016] As a further solution of the present invention: the inner diameter of the positioning cavity is larger than the diameter of the syringe body.

[0017] Beneficial effects of the present invention:

[0018] (1) When preparing for filtration, the syringe filter is mounted in the positioning cavity, and the syringe body is clamped and fixed circumferentially by a clamping block, so as to maintain the stability of the filtration process. At the same time, the clamping block can clamp syringe bodies of different specifications and sizes. Then, the pressure plate is controlled to descend slowly and uniformly along the lifting rail until the pressure plate is pressed against the pressure column, so that the piston can be pushed downward slowly and uniformly. The sample solution is pushed into the cavity between the upper shell and the lower shell, and the ion particles in the solution are effectively filtered through the filter membrane. The filtered sample solution is dripped into the container bottle through the needle for collection. At the same time, the upper shell, the lower shell and the outer sealing sleeve are easy to disassemble and assemble, and the corresponding filter membrane can be quickly replaced according to the different ion particles to be filtered, and the filtration process of different ions can be realized simultaneously on the same device. The operation is simple and the filtration effect is good.

[0019] (2) By setting up a transmission component and a pressure plate, when filtering, the pressure plate uses the counterweight block to push the pressure column to move downward at a uniform speed, and at the same time, the limit column moves synchronously along the slide rod until the piston is pressed down to the bottom of the syringe body. At this time, the stop block at the bottom of the limit column will also be pressed on the contact switch, and the contact switch triggers a stop signal, and the pressure plate will stop moving and no longer press down. During this process, the radial horizontal movement of the clamping block during the clamping process is converted into the vertical movement of the vertical tooth plate through the transmission structure, so that the travel distance of the pressure plate pushing down for filtering can be automatically adjusted according to the syringe bodies of different specifications and sizes, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is another overall structural schematic diagram of the present invention.

[0023] Figure 3 It is a schematic diagram of the structure of the syringe filter in the present invention.

[0024] Figure 4 It is a structural schematic diagram of the sealing seat in the present invention.

[0025] Figure 5 It is a schematic diagram of the installation of the filter membrane in the present invention.

[0026] Figure 6 It is a structural schematic diagram of the positioning cavity tube in the present invention.

[0027] Figure 7 It is a structural schematic diagram of the transmission component in the present invention.

[0028] Figure 8 It is a structural schematic diagram of the sliding rod in the present invention.

[0029] Fig. 9 It is a structural schematic diagram of the pressure plate in the present invention.

[0030] In the figure: 1, workbench; 101, mounting groove; 2, electric lifting rod; 3, syringe holder; 301, positioning cavity; 302, extension shell; 303, clamping block; 304, return spring; 4, syringe filter; 410, syringe body; 411, piston; 412, pressure column; 413, connecting seat; 4131, card convex; 420, sealing seat; 4201, sealing card groove; 421, upper shell; 422, lower shell; 423, filter membrane; 424, outer sealing sleeve; 430, needle; 43 1. Connecting part; 5. Container bottle; 6. Mounting bracket; 601. Lifting electric rail; 602. Slide bar; 603. Anti-slip baffle; 7. Transmission assembly; 71. Horizontal tooth plate; 711. Fixed rod; 712. Slide rail; 72. Rotating shaft; 721. First gear; 722. Second gear; 73. Vertical tooth plate; 731. Support; 732. Return spring; 733. Baffle bar; 734. Contact switch; 8. Press plate; 801. Counterweight; 802. Slide seat; 803. Limit column; 804. Stop block. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1 As shown, the present invention is a multi-channel needle filter device, including a workbench 1, an electric lifting rod 2 is arranged on the upper end of the workbench 1, a syringe rack 3 is arranged on the top of the electric lifting rod 2, a plurality of positioning cavities 301 are evenly spaced through the syringe rack 3, a syringe filter 4 is mounted in the positioning cavity 301, a plurality of mounting grooves 101 are evenly spaced on the upper end of the workbench 1, a container bottle 5 is arranged in the mounting groove 101, and the container bottle 5 is located directly below the corresponding syringe filter 4.

[0033] Specifically, by arranging multiple groups of positioning cavities 301 on the syringe rack 3, multiple groups of syringe filters 4 of different specifications and sizes can be respectively mounted on the positioning cavities 301, wherein the inner diameter of the positioning cavity 301 is larger than the diameter of the syringe filter 4, thereby realizing a multi-channel synchronous filtration process.

[0034] like Figure 3 , Figure 4 and Figure 5 As shown, the syringe filter 4 includes a syringe body 410, a sealing seat 420 and a needle 430. A piston 411 is slidably arranged in the syringe body 410, and a pressure column 412 is fixedly arranged on the top of the piston 411. A connecting seat 413 is arranged at the bottom of the syringe body 410, and the sealing seat 420 is sealingly sleeved on the outside of the connecting seat 413. An upper shell 421 is fixedly arranged at the bottom of the sealing seat 420, and a lower shell 422 is arranged below the upper shell 421. A cavity is formed between the upper shell 421 and the lower shell 422, and a filter membrane 423 is adapted to be installed in the cavity. An outer sealing sleeve 424 is sleeved on the outer circumference of the upper shell 421 and the lower shell 422. A connecting portion 431 is arranged on the top of the needle 430, and the connecting portion 431 is detachably connected to the bottom end of the lower shell 422.

[0035] Specifically, by setting up the syringe filter 4, before starting to filter, first assemble and connect the needle 430 with the connecting seat 413 at the bottom of the syringe body 410, then pull the pressure column 412 upward to suck the sample solution into the syringe body 410, then remove the needle 430, seal the sealing seat 420 and the connecting seat 413, and reinstall the needle 430 to the bottom end of the lower shell 422, so as to form a complete filter. When preparing to filter, the syringe filter 4 is mounted in the positioning cavity 301, and the syringe body 410 is circumferentially clamped and fixed by the clamping block 303, so as to maintain the stability of the filtering process. At the same time, the clamping block 303 can be used for syringe bodies 410 of different specifications and sizes. The filter 423 is clamped and then the pressure plate 8 is controlled to descend slowly and uniformly along the lifting rail 601 until the pressure plate 8 is pressed against the pressure column 412, so that the piston 411 can be pushed downward slowly and uniformly, and the sample solution is pushed into the cavity between the upper shell 421 and the lower shell 422, and the ion particles in the solution are effectively filtered through the filter membrane 423. The filtered sample solution is dripped into the container bottle 5 through the needle 430 for collection. At the same time, the upper shell 421, the lower shell 422 and the outer sealing sleeve 424 are easy to disassemble and assemble, and the corresponding filter membrane 423 can be quickly replaced according to the different ion particles to be filtered, and the filtering process of different ions can be realized simultaneously on the same device, which is simple to operate and has a good filtering effect.

[0036] like Figure 5 As shown, a sealing groove 4201 is circumferentially arranged on the inner wall of the sealing seat 420 , and an annular protrusion 4131 is arranged on the outer wall of the connecting seat 413 , and the protrusion 4131 is adapted to be embedded in the sealing groove 4201 .

[0037] Specifically, when the sealing seat 420 and the connecting seat 413 are mutually socketed, the protrusion 4131 will be correspondingly embedded in the sealing groove 4201, which can be beneficial to the precise positioning of the assembly position of the sealing seat 420 and the connecting seat 413 on the one hand, and can effectively improve the sealing performance between the two on the other hand.

[0038] like Figure 2 , Figure 6 and Figure 7 As shown, a plurality of mounting brackets 6 are evenly spaced on one side of the syringe rack 3, a transmission assembly 7 is provided on each mounting bracket 6, a plurality of clamping blocks 303 for clamping the syringe filter 4 are evenly provided on the inner wall of the positioning cavity 301, and the transmission assembly 7 cooperates with one group of the clamping blocks 303.

[0039] like Figure 6 As shown, the outer wall of the positioning cavity 301 is evenly provided with extension shells 302 , the clamping block 303 is slidably installed in the corresponding extension shell 302 , and a return spring 304 is provided between the clamping block 303 and the extension shell 302 .

[0040] like Figure 7 As shown, the transmission assembly 7 includes a transverse tooth plate 71, a rotating shaft 72 and a vertical tooth plate 73. A fixing rod 711 is provided at one end of the transverse tooth plate 71 close to the positioning cavity 301. The fixing rod 711 slides through the extension shell 302 and is fixedly connected to the corresponding clamping block 303. A slide rail 712 is provided at the upper end of the transverse tooth plate 71. The slide rail 712 is linearly slidably installed in the mounting bracket 6. The rotating shaft 72 is rotatably matched with the mounting bracket 6. The first gear 721 and the second gear 722 are respectively sleeved on the rotating shaft 72. The first gear 721 is meshed with the bottom of the transverse tooth plate 71, and the second gear 722 is meshed with one side of the vertical tooth plate 73.

[0041] Specifically, when preparing for filtering, the syringe filter 4 is mounted in the positioning cavity 301. At this time, the clamping block 303 will be tightly pressed against the outer wall of the syringe body 410 by the elastic force of the reset spring 304 to achieve clamping positioning. During this process, the horizontal tooth plate 71 will slide horizontally together with a group of clamping blocks 303 through the fixed rod 711, and drive the first gear 721 to rotate. The first gear 721 drives the rotating shaft 72 to rotate, and the rotating shaft 72 will drive the second gear 722 to rotate. The second gear 722 will drive the vertical tooth plate 73 to move up and down, thereby converting the radial horizontal movement of the clamping block 303 during the clamping process into the vertical movement of the vertical tooth plate 73 through the transmission structure.

[0042] It should be noted that the syringe body 410 used in the present application has different volumes, generally 5ml, 10ml or 20ml, and the syringe bodies 410 of different specifications and sizes have different lengths and thicknesses. Therefore, during the clamping process, when clamping syringe bodies 410 of different specifications and sizes, the horizontal displacement of the clamping block 303 and the cross tooth plate 71 is also different, and during the filtration process, the stroke of the pressure column 412 and the piston 411 when pushing downward is also different.

[0043] like Figure 8 As shown, a slide bar 602 is fixedly provided on the upper end of the mounting bracket 6, an anti-slip baffle 603 is fixedly provided on the top of the slide bar 602, a support 731 is extended on one side of the vertical tooth plate 73, the support 731 is slidably installed on the slide bar 602 up and down, a return spring 732 is provided between the bottom of the support 731 and the mounting bracket 6, a baffle 733 is fixedly provided on the top of the support 731, the slide bar 602 slides coaxially through the baffle 733, and a contact switch 734 is provided on the top of the baffle 733.

[0044] Furthermore, a lifting electric rail 601 is fixedly provided on the mounting bracket 6 , and a pressing plate 8 is slidably installed on the lifting electric rail 601 , and the pressing plate 8 is pressed against the pressure column 412 of the corresponding syringe filter 4 .

[0045] like Fig. 9 As shown, the front end of the pressing plate 8 is a pressing portion, which is located directly above the corresponding pressing column 412, and a counterweight block 801 is fixedly provided on the upper end of the pressing portion. A sliding seat 802 is provided at the rear end of the pressing plate 8, and the sliding seat 802 slides with the lifting electric rail 601. A limiting column 803 is fixedly provided on one side of the pressing plate 8, and the slide rod 602 coaxially slides through the limiting column 803. A stop block 804 is fixedly provided at the bottom of the limiting column 803, and the stop block 804 is located directly above the contact switch 734.

[0046] Specifically, by setting up the transmission assembly 7 and the pressure plate 8, when filtering, the pressure plate 8 uses the counterweight block 801 to push the pressure column 412 to move downward at a uniform speed, and at the same time the limit column 803 is synchronously displaced along the slide rod 602 until the piston 411 is pressed down to the bottom of the syringe body 410. At this time, the stop block 804 at the bottom of the limit column 803 will also be pressed on the contact switch 734, and the contact switch 734 will trigger a stop signal, and the pressure plate 8 will stop moving and no longer press down.

[0047] More specifically, when the transverse tooth plate 71 clamps the syringe bodies 410 of different specifications and sizes along with the clamping block 303, the larger the diameter of the syringe body 410, the larger the horizontal displacement distance of the transverse tooth plate 71, and the larger the distance that the vertical tooth plate 73 moves downward driven by the first gear 721, the rotating shaft 721 and the second gear 722. At the same time, the baffle rod 733 will be displaced synchronously with the vertical tooth plate 73, so the blocking timing of the baffle rod 733 for the stop block 804 will be delayed accordingly, and then the pressure plate 8 can also move downward a longer distance, that is, the radial horizontal movement of the clamping block 303 during the clamping process is converted into the vertical movement of the vertical tooth plate 73 through the transmission structure, so that the downward pushing and filtering travel distance of the pressure plate 8 can be automatically adaptively adjusted according to the syringe bodies 410 of different specifications and sizes, and has a wide range of applications.

[0048] In this embodiment, the distance between the stop block 804 and the contact switch 734 is consistent with the downward stroke of the piston 411 in the syringe body 410, so that when the piston 411 is pressed down to the bottom of the syringe body 410, the stop block 804 will also press against the contact switch 734 to trigger it, thereby being able to send a stop signal in time so that the pressure plate 8 is no longer pressed down.

[0049] like Figure 1 As shown, the inner diameter of the positioning cavity 301 is larger than the diameter of the syringe body 410 , so that the syringe body 410 after aspirating the sample liquid can be easily placed in the corresponding positioning cavity 301 .

[0050] The working principle of the present invention is as follows: Figure 1-Figure 9As shown, when in use, before starting to filter, first assemble and connect the needle 430 with the connecting seat 413 at the bottom of the syringe body 410, then pull the pressure column 412 upward to suck the sample solution into the syringe body 410, then remove the needle 430, seal the sealing seat 420 and the connecting seat 413, and reinstall the needle 430 to the bottom end of the lower shell 422, so as to form a complete filter. When preparing to filter, the syringe filter 4 is mounted in the positioning cavity 301, and the syringe body 410 is circumferentially clamped and fixed by the clamping block 303 to maintain the stability of the filtering process. During this process, the cross-tooth plate 71 will slide horizontally together with a group of clamping blocks 303 through the fixing rod 711, and The first gear 721 is driven to rotate, and the first gear 721 drives the rotating shaft 72 to rotate. The rotating shaft 72 will drive the second gear 722 to rotate, and the second gear 722 will drive the vertical tooth plate 73 to move up and down, thereby converting the radial horizontal movement of the clamping block 303 during the clamping process into the vertical movement of the vertical tooth plate 73 through the transmission structure. At the same time, the baffle rod 733 will move synchronously with the vertical tooth plate 73. Therefore, when clamping a larger syringe body 410, the blocking timing of the baffle rod 733 for the stop block 804 will be delayed accordingly, and then the pressure plate 8 can also move downward a longer distance, so that the downward pushing and filtering stroke distance of the pressure plate 8 can be automatically adaptively adjusted according to the syringe bodies 410 of different specifications and sizes. During filtering, the pressure plate 8 is controlled to slowly descend along the lifting rail 601 at a uniform speed until the pressure plate 8 is pressed against the pressure column 412, so that the piston 411 can be pushed downward at a uniform speed and slowly, and the sample solution is pushed into the cavity between the upper shell 421 and the lower shell 422, and the ion particles in the solution are effectively filtered through the filter membrane 423. The filtered sample solution is dripped into the container bottle 5 through the needle 430 for collection. At the same time, the upper shell 421, the lower shell 422 and the outer sealing sleeve 424 are easy to disassemble and assemble, and the corresponding filter membrane 423 can be quickly replaced according to the different ion particles to be filtered, and the filtering process of different ions can be realized simultaneously on the same device.

[0051] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A multi-channel needle filter device, comprising a workbench (1), characterized in that: An electric lifting rod (2) is arranged at the upper end of the workbench (1), a syringe rack (3) is arranged at the top end of the electric lifting rod (2), a plurality of positioning cavities (301) are arranged at equal intervals through the syringe rack (3), a syringe filter (4) is mounted in the positioning cavities (301), a plurality of mounting grooves (101) are arranged at equal intervals at the upper end of the workbench (1), a container bottle (5) is arranged in the mounting groove (101), and the container bottle (5) is located directly below the corresponding syringe filter (4); The syringe filter (4) comprises a syringe body (410), a sealing seat (420) and a needle (430); a piston (411) is slidably disposed in the syringe body (410); a pressure column (412) is fixedly disposed on the top of the piston (411); a connecting seat (413) is disposed at the bottom of the syringe body (410); the sealing seat (420) is sealingly sleeved on the outside of the connecting seat (413); and an upper shell portion (430) is fixedly disposed at the bottom of the sealing seat (420). 421), a lower shell portion (422) is arranged below the upper shell portion (421), a cavity is formed between the upper shell portion (421) and the lower shell portion (422), a filter membrane (423) is adapted to be installed in the cavity, an outer sealing sleeve (424) is sleeved on the outer circumference of the upper shell portion (421) and the lower shell portion (422), a connecting portion (431) is arranged at the top end of the needle (430), and the connecting portion (431) is detachably connected to the bottom end of the lower shell portion (422).

2. A multi-channel needle filter device according to claim 1, characterized in that: A sealing groove (4201) is circumferentially provided on the inner wall of the sealing seat (420), and an annular protrusion (4131) is provided on the outer wall of the connecting seat (413), wherein the protrusion (4131) is adapted to be embedded in the sealing groove (4201).

3. A multi-channel needle filter device according to claim 1, characterized in that: A plurality of mounting brackets (6) are arranged at equal intervals on one side of the syringe rack (3), and a transmission assembly (7) is arranged on each of the mounting brackets (6). A plurality of clamping blocks (303) for clamping the syringe filter (4) are evenly arranged on the inner wall of the positioning cavity (301), and the transmission assembly (7) cooperates with one group of the clamping blocks (303).

4. A multi-channel needle filter device according to claim 3, characterized in that: Extension shells (302) are evenly arranged on the outer wall of the positioning cavity tube (301), the clamping block (303) is slidably installed in the corresponding extension shell (302), and a return spring (304) is arranged between the clamping block (303) and the extension shell (302).

5. A multi-channel needle filter device according to claim 4, characterized in that: The transmission assembly (7) comprises a transverse tooth plate (71), a rotating shaft (72) and a vertical tooth plate (73); a fixing rod (711) is arranged at one end of the transverse tooth plate (71) close to the positioning cavity tube (301); the fixing rod (711) slides through the extension housing (302) and is fixedly connected to the corresponding clamping block (303); a slide rail (712) is arranged at the upper end of the transverse tooth plate (71); the slide rail (712) is linearly slidably mounted in the mounting bracket (6); the rotating shaft (72) and the mounting bracket (6) are rotationally matched; a first gear (721) and a second gear (722) are respectively sleeved on the rotating shaft (72); the first gear (721) is meshed with the bottom of the transverse tooth plate (71); and the second gear (722) is meshed with one side of the vertical tooth plate (73).

6. A multi-channel needle filter device according to claim 5, characterized in that: A slide bar (602) is fixedly provided at the upper end of the mounting bracket (6), an anti-slip baffle (603) is fixedly provided at the top of the slide bar (602), a support (731) is extended from one side of the vertical tooth plate (73), the support (731) is slidably installed on the slide bar (602) up and down, a return spring (732) is provided between the bottom of the support (731) and the mounting bracket (6), a baffle (733) is fixedly provided at the top of the support (731), the slide bar (602) coaxially slides through the baffle (733), and a contact switch (734) is provided at the top of the baffle (733).

7. A multi-channel needle filter device according to claim 6, characterized in that: A lifting electric rail (601) is fixedly arranged on the mounting bracket (6), a pressing plate (8) is slidably mounted on the lifting electric rail (601), and the pressing plate (8) is pressed against a pressing column (412) of a corresponding syringe filter (4).

8. The multi-channel needle filter device according to claim 7, characterized in that: The front end of the pressing plate (8) is a pressing portion, and the pressing portion is located directly above the corresponding pressing column (412). A counterweight block (801) is fixedly provided at the upper end of the pressing portion. A sliding seat (802) is provided at the rear end of the pressing plate (8). The sliding seat (802) is slidably matched with the lifting electric rail (601). A limiting column (803) is fixedly provided on one side of the pressing plate (8). The sliding rod (602) coaxially slides through the limiting column (803). A stop block (804) is fixedly provided at the bottom of the limiting column (803), and the stop block (804) is located directly above the contact switch (734).

9. A multi-channel needle filter device according to claim 8, characterized in that: The distance between the stop block (804) and the contact switch (734) is consistent with the downward stroke of the piston (411) in the syringe body (410).

10. A multi-channel needle filter device according to any one of claims 1 to 9, characterized in that: The inner diameter of the positioning cavity (301) is larger than the diameter of the syringe body (410).

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