CN111003673A - Clamping mechanism for twisting test tube caps - Google Patents

Abstract

The invention provides a clamping mechanism for screwing caps of test tubes, comprising a clamping mechanism body connected with a guide shaft assembly of a cap screwing device body, and the clamping mechanism body includes a plurality of caps for clamping the test tubes The pipe cap clamping jaw, the elastic piece and the guide piece connected to the pipe cap clamping jaw; wherein, the elastic piece drives a plurality of pipe cap clamping jaws to open relative to each other, so as to completely or partially wrap the pipe cap; The guide member drives a plurality of relatively open cap jaws to approach each other to clamp the cap; a plurality of the cap jaws are driven by the guide shaft assembly to rotate and move along the axis of the cap at the same time , to screw the cap on. The structure is simple, easy to control, and takes up little space. When tightening the cap, the cap is not easy to slide in the clamping jaws, which is convenient for cap screwing and has high screwing efficiency.

Description

A clamping mechanism for screwing caps of test tubes

technical field

The invention relates to the technical field of medical devices, in particular to a clamping mechanism for screwing a cap of a test tube.

Background technique

In medical clinical tests, it is necessary to use test tubes to collect blood, body fluids, etc. as test samples, and then conduct subsequent analysis after collecting blood. In this series of processes, the capping or uncapping process of test tube caps is inevitably involved, which is common in the market. The cap of the test tube is combined with the test tube itself by screwing. In this way, the interior of the test tube is well isolated from the outside, and it is not easy to cause pollution to the collected blood and body fluids. At present, the capping or capping of the test tube is partly manually operated, which is inefficient and costly, and it is easy to infect the operator with bacteria, which brings harm to the operator's health. In addition, some automated inspection equipment have appeared on the market one after another, equipped with test tube capping mechanisms. These capping mechanisms clamp the tube caps through gripping jaws. The structure is complex, and multiple driving components are required. In order to clamp the pipe cap, the existing method is to install a spring on the clamping jaw and rotate the spring to make the clamping jaw clamp the pipe cap, which is difficult to operate and has low efficiency. In addition, the relative sliding of the pipe cap in the clamping jaw during the cap screwing process is also a technical problem.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies of the prior art, an object of the present invention is to provide a clamping mechanism for screwing the caps of test tubes, through which a plurality of caps are relatively opened by an elastic member to wrap the caps completely or partially, The guide member drives a plurality of pipe cap clamping claws that are relatively open to approach each other to clamp the pipe cap, and the plurality of pipe cap clamping claws are driven by the guide shaft assembly to screw the pipe cap, and the structure is simple. Easy to control and takes up little space.

In order to achieve the above objects, the present invention is achieved through the following technical solutions.

The invention provides a clamping mechanism for screwing caps of test tubes, comprising a clamping mechanism body connected with a guide shaft assembly of a cap screwing device body, and the clamping mechanism body includes a plurality of caps for clamping the test tubes The pipe cap gripper, the elastic member and the guide member connected to the pipe cap gripper; wherein,

The elastic member drives a plurality of cap jaws to open relative to each other, so as to completely or partially wrap the cap; the guide member drives the relatively open cap jaws to approach each other to clamp the cap ; A number of the pipe cap clamping jaws are rotated along the axis direction of the pipe cap while being driven by the guide shaft assembly, so as to screw the pipe cap.

Preferably, the number of the cap clamping claws is two, the elastic member includes a torsion spring, the torsion spring abuts the two cap clamping claws respectively, and the two cap clamping claws are made by the elastic force of the torsion spring. Expand to form a first cavity that holds the cap.

Preferably, a first through hole is provided at one end of the cap clamping jaws, and the two cap clamping jaws are rotatably connected through the first through hole through a rotating shaft.

Preferably, it also includes a first connecting block connected to one end of the pipe cap clamping jaw, the first connecting block is provided with a convex block, and the convex block is provided with a second through hole, and the two pipe caps are provided with a second through hole. The clamping jaw is rotatably connected through the second through hole through the rotating shaft rod.

Preferably, the torsion spring is sleeved on the outside of the rotating shaft and is located between the two cap jaws; when the two cap jaws clamp the tube cap, the inner surface of the cap jaws Fitted with part or all of the outer surface of the cap.

Preferably, the first connecting block is in the shape of a triangular prism, the angle between the two sides of the first connecting block is 90°, and the convex block is arranged on a bottom surface of the first connecting block; the pipe cap clamp The claw includes two finger claws, and the two finger claws are respectively connected to the two sides of the first connecting block with an included angle of 90°; the finger claws are rectangular, and one end surface of the finger claws is provided with the first connecting block The bottom surfaces of the bumps are flush.

Preferably, it also includes a second connection block, two ends of the rotating shaft rod are connected with one end of the second connection block, and the other end of the second connection block is connected with the guide shaft assembly; the guide member is a limit sleeve, the limit sleeve is provided with a third through hole, and the guide shaft assembly drives the two pipe cap clamping jaws to extend into or away from the third through hole, so as to clamp the two pipe caps Or release the cap under the action of the resilient force of the elastic piece.

Preferably, one end of the second connecting block is connected to the guide shaft assembly through a limit block, and the limit block is located on the other side of the limit sleeve relative to the cap jaws, so as to limit the The maximum distance that the cap jaws are away from the limiting sleeve.

Preferably, an outer wall of the finger claw close to one end of the limit sleeve is provided with a guide slope; when the limit block abuts against the limit sleeve, the guide slope fully or partially extends into the third In the through hole, the limiting sleeve cooperates with the elastic member so that the two oppositely opened cap jaws just completely wrap the cap; the two cap jaws holding the cap can pass through the cap completely. The outer contour of the third through hole and inside the third through hole fits with the inner wall of the third through hole.

Preferably, the finger claw is provided with a first protrusion and a second protrusion, the distance between the first protrusion and the second protrusion is slightly larger than the height of the pipe cap, and the third through hole makes the When the two cap jaws are close to the formed clamping cap, the size of the first cavity is slightly smaller than the size of the outer contour of the cap, and the stiffness of the cap jaw and the limiting sleeve is much greater than that of the cap; in,

When the limiting block abuts against the limiting sleeve, the two pipe cap jaws are opened to make an outer wall of the pipe cap abut against the first protrusion, and the guide shaft assembly drives the two pipe caps The clamping jaws extend into the third through hole, and when the two cap clamping jaws are close to each other to clamp the tube cap, the cap clamping jaws abut against the second outer wall relative to the other outer wall of the limiting sleeve. Protruding, the guide shaft assembly drives the two pipe cap clamping jaws to rotate to screw the cap.

Compared with the prior art, the beneficial effects of the present invention are:

(1) An object of the present invention is to provide a clamping mechanism for screwing the caps of test tubes, and a plurality of caps are relatively opened by an elastic member so as to completely or partially wrap the caps, and the guide members are used to drive the relative caps. A plurality of opened cap clamping claws are close to each other to clamp the cap, and a plurality of the cap clamping claws are driven by the guide shaft assembly to screw the cap, the structure is simple, easy to control, and takes up space Small.

(2) In a preferred solution of the present invention, two first connecting blocks, a rotating shaft rod, and a torsion spring are used to connect the two cap jaws in rotation, and the two relatively open cap jaws are brought close to each other through a limit sleeve. , the structure is simple and the manufacturing cost is low.

(3) In a preferred solution of the present invention, the first protrusion and the second protrusion are provided on the guiding inclined surface, the limit block and the finger claw. When the limit block abuts on the limit sleeve, the guide All or part of the inclined surface extends into the third through hole, and the relative opening of the two pipe cap clamping jaws just completely wraps the pipe cap, that is, when the limit block abuts on the limit sleeve, the clamping can be started. When the limit block is away from the limit sleeve, that is, when the two pipe cap jaws continue to extend into the third through hole, the two pipe cap jaws clamp the pipe cap, and at this time, the two pipe cap jaws form the first The size of the cavity is slightly smaller than the size of the outer contour of the tube cap, so that the tube cap will not slide in the two tube cap clamping jaws when the cap is screwed.

(4) In a preferred solution of the present invention, the first connecting block is in the shape of a triangular prism, and forms an angle of 90° between the sides connected with the two finger claws respectively, so that the four finger claws are evenly distributed on the peripheral side of the cap , so that the cap is evenly stressed.

The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly and implement it according to the content of the description, the following examples are used to describe in detail. Specific embodiments of the present invention are given in detail by the following examples.

Description of drawings

The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

FIG. 1 is a schematic exploded view of the structure of the screw-cap gripper mechanism in an embodiment of the present invention;

FIG. 2 is a schematic three-dimensional structural diagram of a cap-twisting gripper mechanism in an embodiment of the present invention;

FIG. 3 is a cross-sectional view of the structure of the screw-cap gripper mechanism according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of two pipe cap clamping jaws clamping the pipe cap according to an embodiment of the present invention;

5 is a schematic diagram of the connection structure of the finger claw and the first connection block in an embodiment of the present invention;

6 is a schematic three-dimensional structural diagram of a first connection block in an embodiment of the present invention;

7 is a schematic diagram 1 of a three-dimensional structure of a finger claw according to an embodiment of the present invention;

FIG. 8 is a schematic diagram 2 of a three-dimensional structure of a finger claw according to an embodiment of the present invention;

In the picture:

400, test tube; 410, tube cap;

510, clamping mechanism body; 511, cap clamp; 5111, finger claw; 5111a, guide slope; 5111b, first protrusion; 5111c, second protrusion; 512, rotating shaft; 513, first connecting block 5131, bump; 5131a, second through hole; 514, torsion spring; 515, second connection block; 516, limit sleeve; 5161, third through hole; 517, limit block;

520. Guide shaft assembly;

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings, and the foregoing and other objects, features, aspects and advantages of the present invention will become more apparent, so that those skilled in the art can implement them with reference to the description. In the drawings, the shapes and dimensions may be exaggerated for clarity, and the same reference numerals will be used throughout the drawings to refer to the same or like parts. In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, lower, etc. are based on the orientation or positional relationship shown in the drawings. In particular, "height" corresponds to the size from top to bottom, "width" corresponds to the size from left to right, and "depth" corresponds to the size from front to back. These relative terms are for convenience of description and are generally not intended to require a specific orientation. Terms referring to attachment, coupling, etc. (eg, "connected" and "attached") refer to the fixed or attached relationship, as well as the movable or rigid attachment or relationship of these structures to each other, directly or indirectly through intervening structures, unless The other way is explicitly stated.

The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, on the premise of no conflict, the embodiments or technical features described below can be combined arbitrarily to form new embodiments. .

Example 1

As shown in FIG. 1 to FIG. 8 , the present invention provides a clamping mechanism for screwing caps of test tubes, including a clamping mechanism body 510 connected to a guide shaft assembly 520 of a cap-screwing device body. The clamping mechanism The body 510 includes a plurality of cap clamping claws 511 for clamping the cap 410 of the test tube 400, elastic members and guides connected to the cap clamping claws 511; wherein,

The elastic member drives a plurality of cap jaws 511 to open relative to each other, so as to completely or partially wrap the cap 410; the guide member drives the relatively open cap jaws 511 to approach each other to clamp the The pipe cap 410 moves along the axis direction of the pipe cap 410 while a plurality of the pipe cap clamping jaws 511 are rotated under the driving of the guide shaft assembly, so as to screw the pipe cap 410 .

The number of the cap jaws 511 is two, and the elastic member includes a torsion spring 514. The torsion springs 514 are in contact with the two cap jaws 511 respectively. The cap clamping jaws 511 are opened at a certain angle to form a first cavity for clamping the tube cap 410 .

In one embodiment, a first through hole is formed at one end of the cap clamping jaws 511 , the two cap clamping jaws 511 are rotatably connected through the first through hole through a rotating shaft 512 , and the torsion spring 514 is sleeved. On the outside of the rotating shaft rod 512 and between the two pipe cap clamping jaws 511 , one end of the rotating shaft rod 512 is fixed by a retaining ring (not shown in the figure). The two cap jaws 511 are opened by the elastic force of the torsion spring 514, and the cap 410 is wrapped in the first cavity. Driven by the guide, the two cap jaws 511 approach each other until the two The cap clamp 511 clamps the cap 410. At this time, the inner surface of the cap clamp 511 is in contact with part or all of the outer surface of the cap 410, so that the cap clamp 511 and the cap The 410 has a larger contact surface for increased gripping force.

In one embodiment, it further includes a first connecting block 513 connected to one end of the cap jaw 511 , the first connecting block 513 is in the shape of a triangular prism, and a bottom surface of the first connecting block 513 is provided with a protrusion. Block 5131, the convex block 5131 is provided with a second through hole 5131a, the two pipe cap jaws 511 are rotatably connected through the second through hole 5131a through the rotating shaft 512, and the torsion spring 514 is sleeved on the The outer side of the rotating shaft rod 512 is located between the two pipe cap clamping jaws 511, and one end of the rotating shaft rod 512 is fixed by a retaining ring (not shown in the figure). The cap clamp 511 includes two finger claws 5111, the two finger claws 5111 are respectively connected to both sides of the first connecting block 513, and the first connecting block 513 and the two sides of the two finger claws 5111 have an included angle of 90°. °, so that the four finger claws 5111 of the two tube cap clamping claws 511 are evenly distributed on the circumference of the tube cap 410, so that the tube cap 410 is evenly stressed. The finger claw 5111 is in the shape of a cuboid, and one end surface of the finger claw 5111 is flush with the bottom surface of the first connecting block 513 on which the protrusion 5131 is provided. In one embodiment, when the two cap clamping claws 511 clamp the cap 410, the two first connecting blocks 513 are not in contact with each other, so as not to affect the effect of the two cap clamping jaws 511 on the cap 410. Screw the cap after clamping.

The size of the first connecting block 513 is not too large, so that the two cap jaws 511 can clamp the cap 410 under the limiting action of the limiting sleeve 516, and the two cap jaws 511 are relatively open. When the cap 410 is completely wrapped, and the two cap jaws 511 are close to each other to clamp the cap 410, the distance required for the two cap jaws 511 to move along the axis of the cap 410 is no more than The size of the first connecting block 513 also affects the relative opening of the two tube cap clamping jaws 511, and affects the spacing between the arrangement of several test tubes 400.

It also includes a second connecting block 515. The second connecting block 515 is a hollow structure. The first connecting block 513 is located in the second connecting block 515. One end of the second connecting block 515 is connected to the guide shaft assembly 520 at the other end of the second connecting block 515 .

The guide member is a limit sleeve 516, the limit sleeve 516 is provided with a third through hole 5161, and the size of the second connecting block 515 is smaller than the size of the third through hole 5161, so that the first The second connecting blocks 515 can move within the third through holes 5161 . The guide shaft assembly 520 drives the second connecting block 515 to move along the axis of the cap 410, and drives the first connecting block 513 connected to the second connecting block 515 together with the two cap jaws 511 along the The pipe cap 410 moves in the axial direction and extends into or away from the third through hole 5161 . When the two cap clamping jaws 511 gradually extend into the third through hole 5161, the two cap clamping jaws 511 approach each other until they clamp the tube cap 410; when the two cap clamping jaws 511 are separated from the The third through hole 5161, the two tube caps 410 release the clamped tube caps 410 under the rebound action of the elastic member, even if the two tube caps 410 are clamped or released under the elastic force of the elastic member The cap 410. The limiting sleeve 516 is fixedly installed on the surface of an object, so that the limiting sleeve 516 will not move along with the movement of the two cap jaws 511 driven by the guide shaft assembly 520 .

One end of the second connecting block 515 is connected to the guide shaft assembly 520 through a limiting block 517, the limiting block 517 is a hollow structure, one end is connected to the second connecting block 515, and the opposite end is connected to the guide shaft assembly 520. The size is larger than the size of the third through hole 5161, and the limiting block 517 is located on the other side of the limiting sleeve 516 relative to the cap clamping claw 511, so as to restrict the cap clamping claw 511 from being in the same position. The maximum distance that the guide shaft assembly 520 can be away from the limiting sleeve 516 under the driving.

The outer wall of the finger claws 5111 close to one end of the limiting sleeve 516 is provided with a guiding inclined surface 5111a; In a small structure, when the limiting block 517 abuts against the limiting sleeve 516 , the guiding inclined surface 5111 a fully or partially protrudes into the third through hole 5161 . Further, when the limiting block 517 abuts against the limiting sleeve 516 , the guiding inclined surface 5111 a just fully extends into the third through hole 5161 . The inclination angle of the guiding inclined surface 5111a is such that when the guiding inclined surface 5111a just fully protrudes into the third through hole 5161 , the restoring force of the two cap jaws 511 on the elastic member and the limit of the limiting sleeve 516 . The first cavity that is relatively opened under the action of the position can completely enclose the tube cap 410 . When the cap clamping jaws 511 continue to extend into the third through hole 5161 under the driving action of the guide shaft assembly 520, the opening angle of the two cap clamping jaws 511 gradually decreases until the caps are clamped. Step 410 , at this time, the two cap clamping jaws 511 can completely pass through the third through hole 5161 and the outer contours of the two tube cap clamping claws 511 fit within the third through hole 5161 and the inner wall of the third through hole 5161 .

The outer contour of the cap 410 of the test tube commonly used in the market is cylindrical, the third through hole 5161 is cylindrical, the first connecting block 513 is the same size as the sides connected with the two finger claws 5111 respectively, and the two caps are of the same size. The outer contour of the clamping jaws 511 when clamping the pipe cap 410 can be circumscribed to a cylindrical shape, the size of the cylindrical shape is consistent with the third through hole 5161 , and the inner surfaces of the two pipe cap clamping jaws 511 are evenly close to the on the outer wall of the cap 410. In rare cases, the outer contour of the pipe cap 410 is irregular, then the inner contour of the two pipe cap clamping jaws 511 matches the outer contour of the pipe cap 410, and the outer contour of the two pipe cap clamping jaws 511 can still be externally connected to a cylindrical shape. The shape and size are consistent with the third through hole 5161, so that while the two cap jaws 511 can be pressed and clamped by the limiting sleeve 561, the two cap jaws 511 can rotate in the third through hole 5161 .

The finger claws 5111 are provided with a first protrusion 5111b and a second protrusion 5111c. The first cavity is formed between the inner surfaces of the two cap jaws 511, the first protrusion 5111b and the second protrusion 5111c. Space. The distance between the first protrusion 5111b and the second protrusion 5111c is slightly larger than the height of the pipe cap 410 . , the tube cap 410 is located in the first cavity formed between the inner surfaces of the two tube cap clamping jaws 511, the first protrusion 5111b, the second protrusion 5111c, and the tube cap 410 and the two tubes The inner surfaces of the cap jaws 511 abut against each other. The third through hole 5161 makes the two cap jaws 511 close to form a first cavity for clamping. The size of the first cavity is slightly smaller than the size of the outer contour of the cap 410. The cap jaws 511 and the limiting sleeve 516 The stiffness of the tube cap 410 is much greater than that of the tube cap 410, that is, the elastic deformation performance of the tube cap 410 is better than that of the tube cap jaws 511 and the limit sleeve 516, and the two tube cap jaws 511 are in the limit sleeve 516. The inner wall of the third through hole 5161 clamps the tube cap 410, and under the elastic deformation of the tube cap 410 itself, the two tube cap clamping jaws 511 continue to approach each other until the tube cap is clamped 410 , screw the cap. When screwing the cap, the tube cap 410 will not slide relative to the tube cap clamping claw 511 . in,

When the limiting block 517 abuts against the limiting sleeve 516 , the two cap jaws 511 are opened so that an outer wall of the cap 410 abuts against the first protrusion 5111b , and the guide shaft assembly 510 Drive the two cap clamping claws 511 to extend into the third through hole 5161. When the two cap clamping claws 511 are close to each other to clamp the cap 410, the cap clamping claws 511 are relative to the limit The other outer wall of the sleeve 516 abuts against the second protrusion 5111c, and the guide shaft assembly 510 drives the two cap clamping jaws 511 to rotate to perform capping.

In one embodiment, the cap jaws 511 and the limiting sleeve 516 are made of a metal material with surface oxidation to improve surface wear resistance; the cap 410 is made of plastic.

In one embodiment, a rubber layer (not shown in the figure) is provided on the inner surface of the cap clamping jaw 511 for clamping the cap 410 to increase the clamping force of the cap 410 .

It should be understood that the guide shaft assembly 520 (simplified representation in the drawings) described in this embodiment can be any existing structure capable of realizing the movement and/or rotational movement of the gripper along the axis of the cap, which will not be repeated here. .

Although the embodiment of the present invention has been disclosed as above, it is not limited to the application listed in the description and the embodiment, and it can be applied to various fields suitable for the present invention. For those skilled in the art, it can be easily Therefore, the invention is not limited to the specific details and embodiments shown herein without departing from the general concept defined by the appended claims and the scope of equivalents.

Claims (10)

1. A clamping mechanism for screwing caps of test tubes, comprising a clamping mechanism body (510) connected with a guide shaft assembly (520) of a cap-screwing device body, characterized in that the clamping mechanism body (510) ) comprises a plurality of cap clamping claws (511) used to clamp the cap (410) of the test tube (400), elastic pieces and guides connected to the cap clamping claw (511); wherein, The elastic member drives a plurality of tube cap clamping claws (511) to open relative to each other, so as to completely or partially wrap the tube cap (410); the guide member drives the relatively open tube cap clamping claws (511) to mutually approach to clamp the pipe cap (410); a number of the pipe cap clamping jaws (511) move along the axis direction of the pipe cap (410) while being driven by the guide shaft assembly to rotate, so as to clamp the pipe cap (410). The cap (410) is screwed. 2. The clamping mechanism for screwing the cap of a test tube according to claim 1, wherein the number of the cap clamping jaws (511) is two, and the elastic member comprises a torsion spring (514). ), the torsion springs (514) are respectively abutted against the two pipe cap jaws (511), and the two pipe cap jaws (511) are opened by the elastic force of the torsion springs (514) to form clamping the pipe The first cavity of the cap (410). 3 . The clamping mechanism for screwing the cap of a test tube according to claim 2 , wherein a first through hole is provided at one end of the cap gripper ( 511 ), and two of the cap grippers are provided with a first through hole. 4 . (511) The rotating shaft rod (512) passes through the first through hole for rotational connection. 4. A clamping mechanism for screwing the cap of a test tube according to claim 2, characterized in that further comprising a first connecting block (513) connected to one end of the cap clamping jaw (511), The first connecting block (513) is provided with a protruding block (5131), and the protruding block (5131) is provided with a second through hole (5131a). 512) through the second through hole (5131a) for rotational connection. 5. A clamping mechanism for screwing the cap of a test tube according to claim 3 or 4, wherein the torsion spring (514) is sleeved on the outside of the rotating shaft rod (512) and is located in two places between the pipe cap clamping jaws (511); when the two pipe cap clamping jaws (511) clamp the pipe cap (410), the inner surface of the pipe cap clamping jaws (511) and the pipe cap (410) ) on part or all of the outer surface. 6. The clamping mechanism for screwing the cap of a test tube according to claim 4, wherein the first connecting block (513) is in the shape of a triangular prism, and the first connecting block (513) is in the shape of a triangular prism. The included angle between the two side surfaces is 90°, and the protruding block (5131) is arranged on a bottom surface of the first connecting block (513). (5111) are respectively connected to the two side surfaces of the first connecting block (513) whose included angle is 90°; The bottom surface of the block (513) provided with the protruding block (5131) is flush. 7 . The clamping mechanism for screwing the cap of a test tube according to claim 5 , further comprising a second connecting block ( 515 ), the two ends of the rotating shaft rod ( 512 ) are connected to the second connecting block ( 512 ). 8 . One end of the connecting block (515) is connected, and the other end of the second connecting block (515) is connected with the guide shaft assembly (520); the guide is a limit sleeve (516), the limit The sleeve (516) is provided with a third through hole (5161), and the guide shaft assembly (520) drives the two cap jaws (511) to extend into or away from the third through hole (5161), so that the two The pipe cap (410) is clamped or released under the action of the resilient force of the elastic member. 8 . The clamping mechanism for screwing the cap of a test tube according to claim 7 , wherein one end of the second connection block ( 515 ) is connected to the guide shaft assembly ( 520), the limit block (517) is located on the other side of the limit sleeve (516) relative to the cap clamp (511) to limit the cap clamp (511) away from The maximum distance of the limiting sleeve (516). 9 . The clamping mechanism for screwing the cap of a test tube according to claim 8 , wherein the outer wall of the finger claw ( 5111 ) close to one end of the limiting sleeve ( 516 ) is provided with a guiding inclined surface. 10 . (5111a); when the limiting block (517) abuts against the limiting sleeve (516), the guiding slope (5111a) fully or partially extends into the third through hole (5161), and the The limiting sleeve (516) cooperates with the elastic member so that the two oppositely opened pipe cap clamping claws (511) just completely wrap the pipe cap (410); the two pipe caps that clamp the pipe cap (410) The clamping claw (511) can completely pass through the third through hole (5161), and the outer contour when inside the third through hole (5161) fits with the inner wall of the third through hole (5161). 10. The clamping mechanism for screwing the cap of a test tube according to claim 8, wherein the finger claw (5111) is provided with a first protrusion (5111b) and a second protrusion (5111c) , the distance between the first protrusion (5111b) and the second protrusion (5111c) is slightly larger than the height of the tube cap (410), and the third through hole (5161) makes the two tube cap clamping jaws ( 511) When approaching the formed clamping cap (410), the size of the first cavity is slightly smaller than the size of the outer contour of the cap (410); wherein, When the limiting block (517) abuts against the limiting sleeve (516), the two pipe cap clamping claws (511) are opened so that an outer wall of the pipe cap (410) abuts against the first protrusion (5111b), the guide shaft assembly (510) drives the two cap clamping jaws (511) to extend into the third through hole (5161), and the two cap clamping jaws (511) are close to each other to clamp When the pipe cap (410) is used, the pipe cap clamping claw (511) abuts against the second protrusion (5111c) relative to the other outer wall of the limiting sleeve (516), and the guide shaft assembly (510) The two cap clamping jaws (511) are driven to rotate to perform cap screwing.

Images