Clamping mechanism and switch cover device applicable to test tube caps

Abstract

The present application provides a clamping mechanism and a switch cover device applicable to a test tube cap. The clamping mechanism includes a bracket and two clamping members. A rotating member is rotatably connected to the bracket, and two support arms are provided on the outer wall of the rotating member. The two clamping members are respectively arranged on the two support arms, and each includes a vertically extending plate, a sharp edge portion, and an inclined surface portion. The sharp edge portion and the inclined surface portion are arranged side by side on the vertically extending plate. The switch cover device includes the above-mentioned clamping mechanism applicable to the test tube cap, and they have the same beneficial effects. When clamping the test tube cap, the two sharp edge portions and the two inclined surface portions corresponding to the two clamping members are centrosymmetric with the central axis of the test tube cap, and the tips and the inclined surfaces both contact the outer wall of the test tube cap to achieve the clamping effect. For the clamping mechanism and the switch cover device applicable to the test tube cap provided by the present application, the sharp edge portion is used for anti-slip, and the inclined surface portion is used to ensure that the force is directed towards the central axis of the test tube cap, solving the technical problem that the test tube cap cannot be capped back onto the test tube due to deformation caused by the force on the test tube cap.

Description

Technical Field

[0001] This application belongs to the technical field of medical devices, and particularly relates to a clamping mechanism and a cap opening / closing device applicable to a test tube cap. Background Art

[0002] In the field of in vitro diagnosis, medical staff often need to use test tubes for sampling. After sampling, to protect the sample, the test tube needs to be sealed with a test tube cap, and then the test tube is directly placed into a detection instrument for in vitro testing and diagnosis.

[0003] When the test tube is being tested inside the instrument, the test tube cap needs to be opened by a cap opening / closing device equipped inside the instrument, then the sample is taken out of the test tube by a sampling needle or a sampling pipette tip, and finally the test tube cap is put back on by a rotary cap opening mechanism.

[0004] Existing cap opening / closing devices usually use motion modules such as electric claws, electric cylinders or rotary electric claws for clamping. To ensure the clamping effect, vertical lines are usually added to the clamping surfaces of the above structures to increase the friction force. However, using the above method not only increases the processing cost, but also makes the requirements for the position of the test tube more stringent; when the position of the test tube is offset, the two clamping surfaces are likely to crush the test tube cap, resulting in the technical defect that it cannot be put back on the test tube. Summary of the Invention

[0005] The embodiments of this application provide a clamping mechanism and a cap opening / closing device applicable to a test tube cap, aiming to solve the technical problem that during the clamping process of the test tube, the test tube cap cannot be put back on the test tube due to deformation caused by the force on it.

[0006] To achieve the above object, the technical solution adopted in this application is:

[0007] Provide a clamping mechanism applicable to a test tube cap, including a bracket and two clamping members; wherein, the bracket is used for being assembled on the fixed surface of a detection instrument, and is rotatably connected with a rotating member in the up and down direction; the two clamping members are arranged axially symmetrically with the rotation axis of the rotating member as the center; the clamping member includes:

[0008] A vertically extending plate, the upper end of which is slidably connected with the rotating member; the sliding directions of the two vertically extending plates are opposite, so as to be suitable for moving towards each other or moving away from each other; define the adjacent side surfaces of the two vertically extending plates as their clamping surfaces;

[0009] A sharp edge part, integrally connected with the vertically extending plate and located on the corresponding clamping surface, the tip of which is used for contacting the outer peripheral wall of the test tube cap; and

[0010] The inclined face portion is integrally connected to the vertical extension plate and is arranged side by side with the pointed edge portion in the horizontal direction on the corresponding clamping surface; in the direction of the corresponding clamping surface facing the rotation axis of the rotating member, the inclined surface of the inclined face portion inclines in the direction away from the pointed edge portion, and the inclined surface is used to contact the outer peripheral wall of the test tube cap.

[0011] Wherein, when the vertical extension plate moves towards the test tube cap, the pointed edge portion and the inclined face portion are adapted to contact the test tube cap simultaneously, and the tip of the pointed edge portion and the inclined surface both face the central axis of the test tube cap; when the two vertical extension plates move towards the test tube cap simultaneously, the two pointed edge portions and the two inclined face portions are all adapted to be centrosymmetric about the central axis of the rotating member.

[0012] In a possible implementation manner, a reset member is provided between the two vertical extension plates, and the reset member is used to drive the two vertical extension plates to move towards each other so that the pointed edge portion and the inclined face portion contact the test tube cap.

[0013] In a possible implementation manner, the reset member includes:

[0014] A limiting rod, arranged between the two vertical extension plates, and its two ends respectively correspond to the two vertical extension plates one by one; and

[0015] Two tension springs, respectively fixedly connected to the two ends of the limiting rod, and each tension spring is connected to the corresponding vertical extension plate;

[0016] Wherein, when the pointed edge portions and the inclined face portions of the two clamping members contact the test tube cap simultaneously, the two tension springs are both in a normal state or a stretched state at the same time.

[0017] In a possible implementation manner, two slide rails extending outward in opposite directions are provided on the rotating member, and the two slide rails correspond to the two vertical extension plates one by one; each vertical extension plate further includes:

[0018] A slider, adapted to be slidably engaged on the corresponding slide rail and fixedly connected to the upper end of the vertical extension plate;

[0019] Wherein, the reset member is connected to the slider to drive the vertical extension plate to move through the slider.

[0020] In a possible implementation manner, blocking portions are provided on the adjacent side surfaces of the two sliders; when the pointed edge portions and the inclined face portions of the two clamping members contact the test tube cap simultaneously, the two blocking portions are in contact with each other to limit the two vertical extension plates from continuing to move towards each other.

[0021] In a possible implementation manner, the bracket further includes:

[0022] A transmission rod is slidably connected to the bracket in the up-and-down direction and coaxially inserted into the rotating member, and its lower end is located above the two blocking portions; a conical block adapted to be inserted between the two blocking portions is connected to the lower end of the transmission rod; and

[0023] A linear motor is fixedly connected to the bracket, above the transmission rod, and its power output end is arranged downward;

[0024] Wherein, the linear motor is used to drive the transmission rod to move downward from top to bottom, so that the conical block is inserted between the two blocking portions and overcome the reset member to drive the two blocking portions to move away from each other.

[0025] In a possible implementation manner, the blocking portion is a roller rotatably connected to the corresponding slider; the rotation axis of the roller is parallel to the horizontal direction and perpendicular to the sliding direction of the vertical extension plate;

[0026] When the sharp edge portions and the inclined surface portions corresponding to the two clamping members simultaneously contact the test tube cap, the outer peripheral walls of the two rollers are in contact with each other to limit the two vertical extension plates from continuing to move towards each other.

[0027] In a possible implementation manner, the clamping member further includes:

[0028] A latching portion is fixedly connected to the lower end of the vertical extension plate and is on the clamping surface, and is used to abut against the lower edge of the test tube cap so that the test tube cap moves synchronously with the upward movement of the vertical extension plate.

[0029] In a possible implementation manner, the surface roughness Ra of the inclined surface is ≤6.4um.

[0030] In the embodiment of the present application, by driving the two clamping members to move towards each other relative to the bracket, the clamping of the test tube cap can be realized, and the test tube cap is coaxially arranged with the rotating member; during the process of clamping the test tube cap, the two vertical extension plates corresponding to the two clamping members both slide relative to the rotating member, and the two inclined surface portions are both adapted to contact the test tube cap to limit the position of the test tube cap in the radial direction, so as to realize the adjustment of the test tube position and avoid the unexpected situation of inability to clamp caused by the deviation of the horizontal position of the test tube; at the same time, when the test tube cap is clamped, the two sharp edge portions act simultaneously to ensure that when the rotating member rotates relative to the bracket, the test tube cap can rotate under the action of the clamping member.

[0031] Since the two pointed edge parts are centrosymmetric with respect to the central axis of the rotating member, and the test tube cap in the clamping state is coaxially arranged with the rotating member, the acting forces of the two pointed edge parts can cancel each other out, thus preventing the test tube cap from being damaged. At the same time, since the two inclined surface parts are symmetric with respect to the central axis of the rotating member, and the test tube cap in the clamping state is coaxially arranged with the rotating member, the action of the two inclined surface parts will limit the position of the test tube cap and ensure that the acting force is directed towards the central axis of the test tube cap to produce a mutual cancellation effect.

[0032] Compared with the prior art, the clamping mechanism for the test tube cap provided in this embodiment uses the pointed edge parts for anti-slip and the inclined surface parts to ensure that the acting force is directed towards the central axis of the test tube cap. While ensuring the clamping effect, it solves the problem that the test tube cap cannot be put back on the test tube due to deformation caused by the acting force.

[0033] The technical solution adopted in this application also provides a switch cover device, including the clamping mechanism for the test tube cap proposed in any one of the foregoing, and a rotation driving member for driving the rotation of the rotating member.

[0034] The beneficial effects of the switch cover device provided in this embodiment are the same as those of the clamping mechanism for the test tube cap described above, and will not be elaborated here. Description of the Drawings

[0035] Figure 1 is a schematic structural diagram of the clamping mechanism for the test tube cap provided in the embodiment of the present application;

[0036] Figure 2 is Figure 1 a partial enlarged schematic diagram at the upper circle A;

[0037] Figure 3 is a schematic structural diagram between the vertical extension plate and the test tube cap adopted in the embodiment of the present application;

[0038] Figure 4 is a schematic structural diagram of the vertical extension plate adopted in the embodiment of the present application;

[0039] Figure 5 is a schematic structural diagram of the reset member adopted in the embodiment of the present application;

[0040] Figure 6 is an exploded schematic diagram between the vertical extension plate and the slider adopted in the embodiment of the present application;

[0041] Figure 7 is a schematic combined structural diagram of the transmission rod and the conical block adopted in the embodiment of the present application;

[0042] Description of the reference numerals: 1, support; 2, rotating member; 21, support arm; 22, slide rail; 3, vertically extending plate; 31, slider; 4, sharp edge portion; 5, inclined surface portion; 6, reset member; 61, limiting rod; 62, tension spring; 7, blocking portion; 8, transmission rod; 81, conical block; 82, linear motor; 9, engaging portion. Detailed implementation manners

[0043] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0044] Please refer to Figures 1 to 7 simultaneously, and a clamping mechanism applicable to a test tube cap provided by the present application will be described. The clamping mechanism applicable to a test tube cap proposed by the present application includes a support 1 and two clamping members.

[0045] The support 1 is used to be assembled on the fixed surface of the detection instrument, and the specific assembly position is above the stopping position of the test tube conveying member. The specific assembly method is the prior art, and different methods such as adhesive pasting, welding, and bolt connection can be selected to achieve it. A rotating member 2 is rotatably connected to the support 1 in the up and down direction, and the axis of the rotating member 2 is also parallel to the up and down direction; in this embodiment, the support 1 adopts a frame body with a C-shaped vertical cross-section, and the installation position of the rotating member 2 and the support 1 is on the lower end surface of the support 1.

[0046] The two clamping members are centrosymmetric with respect to the central axis of the rotating member 2; in this embodiment, there are two support arms 21 on the outer peripheral wall of the rotating member 2, and both support arms 21 extend radially outward along the rotating member 2, and the extending directions of the two support arms 21 are opposite, that is, the two support arms 21 are centrosymmetric with respect to the central axis of the rotating member 2; correspondingly, the above two clamping members correspond to the two support arms 21 one by one.

[0047] In this embodiment, the clamping member includes a vertically extending plate 3, a sharp edge portion 4 and an inclined surface portion 5.

[0048] The vertically extending plate 3 adopts a plate body structure extending in the up and down direction, and its upper end is slidably connected to the corresponding support arm 21, and the sliding direction is parallel to the extending direction of the support arm 21. In this embodiment, for the convenience of description, the side surface of the vertically extending plate 3 facing the rotating member 2 (that is, the adjacent side surfaces of the two vertically extending plates 3) is defined as its clamping surface.

[0049] The sharp edge portion 4 is integrally connected to the vertical extension plate 3 and adopts a strip structure extending in the up and down direction with a triangular cross-section. This sharp edge portion 4 is located on the clamping surface, and its tip is used to contact the outer peripheral wall of the test tube cap; when there are a plurality of grooves distributed circumferentially on the outer peripheral wall of the test tube cap, the tip of the sharp edge portion 4 is adapted to be embedded in any one of the grooves of the test tube cap.

[0050] The inclined surface portion 5 is integrally connected to the vertical extension plate 3 and adopts a block structure extending in the up and down direction with a quadrilateral cross-section. This inclined surface portion 5 and the sharp edge portion 4 are arranged side by side in the horizontal direction on the clamping surface, and the side-by-side direction is perpendicular to the extending direction of the corresponding support arm 21.

[0051] The above-mentioned inclined surface portion 5 has an inclined surface; in the direction away from the clamping surface, the inclined surface of the inclined surface portion 5 inclines in the direction away from the sharp edge portion 4, and the inclined surface is used to contact the outer peripheral wall of the test tube cap.

[0052] When the vertical extension plate 3 moves towards the test tube cap, the sharp edge portion 4 and the inclined surface portion 5 are adapted to contact the test tube cap simultaneously, and the tip and the inclined surface of the sharp edge portion 4 both face the central axis of the test tube cap; when the two vertical extension plates 3 move towards the test tube cap simultaneously, the two sharp edge portions 4 and the two inclined surface portions 5 are both adapted to be centrosymmetric about the central axis of the rotating member 2.

[0053] In the embodiment of the present application, by driving the two clamping members to move towards each other relative to the bracket 1, the clamping of the test tube cap can be achieved, and the test tube cap is coaxially arranged with the rotating member 2; during the process of clamping the test tube cap, the two vertical extension plates 3 corresponding to the two clamping members both slide relative to the support arm 21, and the two inclined surface portions 5 are both adapted to contact the test tube cap to limit the position of the test tube cap in the radial direction, thereby realizing the adjustment of the test tube position and avoiding the unexpected situation of being unable to clamp due to the deviation of the horizontal position of the test tube; at the same time, when the test tube cap is clamped, the two sharp edge portions 4 act simultaneously to ensure that when the rotating member 2 rotates relative to the bracket 1, the test tube cap can rotate under the action of the clamping member.

[0054] Since the two sharp edge portions 4 are centrosymmetric with respect to the central axis of the rotating member 2, and the test tube cap in the clamped state is coaxially arranged with the rotating member 2, the acting forces of the two sharp edge portions 4 can cancel each other out, thereby avoiding damage to the test tube cap. At the same time, since the two inclined surface portions 5 are symmetric with respect to the central axis of the rotating member 2, and the test tube cap in the clamped state is coaxially arranged with the rotating member 2, the action of the two inclined surface portions 5 will limit the position of the test tube cap and at the same time ensure that the acting forces are directed towards the central axis of the test tube cap to produce a mutual cancellation effect.

[0055] Compared with the prior art, the clamping mechanism for the test tube cap provided in this embodiment uses the sharp edge portion 4 for anti-slip and the inclined surface portion 5 for ensuring that the acting force is directed towards the central axis of the test tube cap, while ensuring the clamping effect, solving the technical problem that the test tube cap cannot be covered back on the test tube due to the deformation of the test tube cap under force.

[0056] In some embodiments, the above-mentioned vertical extension plate 3 may adopt the structure as Figure 1 shown. Refer to Figure 1 , there is a reset member 6 between the two vertical extension plates 3; in this embodiment, the reset member 6 is used to drive the two vertical extension plates 3 to move towards each other, so that the sharp edge portion 4 and the inclined surface portion 5 contact the test tube cap, thereby achieving the technical purpose of adjusting the position of the test tube cap and clamping the test tube cap.

[0057] In some embodiments, the above-mentioned reset member 6 may adopt the structure as Figure 5 shown. Refer to Figure 5 , the reset member 6 includes a limit rod 61 and a tension spring 62.

[0058] The limit rod 61 is arranged between the two vertical extension plates 3, its axial direction is parallel to the arrangement direction of the two vertical extension plates 3, and its two ends correspond to the two vertical extension plates 3 respectively.

[0059] The two tension springs 62 are respectively fixedly connected to the two ends of the limit rod 61, and each tension spring 62 is connected to the corresponding vertical extension plate 3.

[0060] By adopting the above technical solution, when the sharp edge portions 4 and the inclined surface portions 5 corresponding to the two clamping members contact the test tube cap at the same time, the two tension springs 62 are both in the normal state or the stretched state. Specifically: if the tension spring 62 is in the normal state, when the rotating member 2 is rotated, the test tube cap and the sharp edge portion 4 are driven by friction (or the abutting force generated by the tip of the sharp edge portion 4 being embedded in the groove) to realize the rotational drive of the test tube cap relative to the test tube body; if the tension spring 62 is in the stretched state, the tension spring 62 exerts a continuous pulling force on the sharp edge portion 4, improving the clamping force exerted by the two clamping members on the test tube cap.

[0061] It should be supplemented and explained that by presetting the length of the limit rod 61, it can also achieve the following technical effects: when the two clamping members move towards each other, the two ends of the limit rod 61 respectively abut against the corresponding vertical extension plates 3 of the two clamping members, thereby restricting the further movement of the two vertical extension plates 3 and avoiding the accidental situation that the test tube cap is damaged due to excessive movement of the two vertical extension plates 3 towards each other caused by device failures or other reasons.

[0062] In some embodiments, the above-mentioned support arm 21 and vertical extension plate 3 may adopt the structure as Figures 4 to 6 shown. Refer to Figures 4 to 6 , each support arm 21 is provided with a slide rail 22, and this slide rail 22 is fixedly arranged on the lower end surface of the support arm 21 and extends along the extension direction of the support arm 21.

[0063] The vertical extension plate 3 further includes a slider 31 which is adapted to be slidably fitted on the slide rail 22 and fixedly connected to the upper end of the vertical extension plate 3; through the combined structure of the slider 31 and the slide rail 22, the sliding connection relationship between the vertical extension plate 3 and the support arm 21 is realized, and the sliding direction of the vertical extension plate 3 can be effectively limited, improving the stability of the mechanism during actual use.

[0064] The above-mentioned reset member 6 is connected to the slider 31 to drive the vertical extension plate 3 to move through the slider 31, so that the end position of the reset member 6 is adjustable, avoiding the technical problem that the reset member 6 cannot be stably connected due to the limited space between the two vertical extension plates 3.

[0065] In some embodiments, the above-mentioned feature slider 31 can adopt the structure as Figure 2 shown. Refer to Figure 2 , and anti-movement parts 7 are provided on the adjacent sides of the two sliders 31; when the sharp edge parts 4 and the inclined surface parts 5 corresponding to the two clamping members contact the test tube cap at the same time, the two anti-movement parts 7 are joined to limit the two vertical extension plates 3 from moving towards each other continuously, avoiding the accidental situation that the test tube cap is damaged due to excessive movement of the two vertical extension plates 3 towards each other caused by device failures or other reasons.

[0066] In some embodiments, the above-mentioned feature bracket 1 can adopt the structure as Figure 1 , Figure 2 and Figure 7 shown. Refer to Figure 1 , Figure 2 and Figure 7 , the bracket 1 further includes a transmission rod 8 and a linear motor 82.

[0067] The transmission rod 8 is slidably connected to the bracket 1 in the up and down direction and is coaxially inserted into the rotating member 2, and its lower end is located above the two anti-movement parts 7. A conical block 81 adapted to be inserted between the two anti-movement parts 7 is connected to the lower end of the transmission rod 8, and the conical surface of the conical block 81 faces downward; in this embodiment, the lower part of the conical block 81 adopts a structure with a triangular vertical cross-section.

[0068] The linear motor 82 is fixedly connected to the bracket 1, is located above the transmission rod 8, and its power output end faces downward.

[0069] Among them, the linear motor 82 is used to drive the transmission rod 8 to move from top to bottom, so that the conical block 81 is inserted between the two anti-movement parts 7 and overcomes the reset member 6 to drive the two anti-movement parts 7 to move away from each other, thereby realizing the separation of the two vertical extension plates 3 to allow the test tube cap to enter, or releasing the test tube cap between the two vertical extension plates 3.

[0070] In some embodiments, the above-mentioned feature anti-movement part 7 can adopt the structure as Figure 2 shown. Refer to Figure 2, the blocking part 7 is a roller rotatably connected to the corresponding slider 31; the rotation axis of this roller is parallel to the horizontal direction and perpendicular to the extension direction of the support arm 21. The technical purpose of adopting the above structure is as follows:

[0071] On the one hand, when the sharp edge parts 4 and the inclined surface parts 5 of the two clamping members contact the test tube cap simultaneously, the outer peripheral walls of the two rollers are in contact with each other to limit the two vertical extension plates 3 from moving towards each other continuously, thereby ensuring the limiting effect; on the other hand, when the conical block 81 moves downward, the roller can rotate relative to the slider 31, which is convenient for the embedding of the conical block 81 and improves the stability of the mechanism during actual use.

[0072] In some embodiments, the above-mentioned characteristic clamping members can adopt structures such as Figure 1 and Figure 4 as shown. Refer to Figure 1 and Figure 4 , the clamping member further includes a hook portion 9.

[0073] The hook portion 9 is fixedly connected to the lower end of the vertical extension plate 3, which is on the clamping surface and extends towards the area between the two vertical extension plates 3.

[0074] When the vertical extension plate 3 moves upward, the hook portion 9 is used to abut against the lower edge end face of the test tube cap, so that the test tube cap moves synchronously with the upward movement of the vertical extension plate 3. This situation usually applies to the following cases: due to reasons such as the surface of the test tube cap being too smooth or the test tube body rotating with the test tube cap, the test tube cap cannot rotate relative to the test tube body. At this time, through the contact between the hook portion 9 and the lower edge of the test tube cap, the test tube cap can be removed from the test tube body by using the upward pulling force.

[0075] In some embodiments, the surface roughness Ra of the inclined surface of the above-mentioned characteristic inclined surface part 5 is ≤6.4um. This value is obtained through multiple experiments and complex mechanical analyses. When the surface roughness adopts the above value, the inclined surface of the inclined surface part 5 is equivalent to a smooth surface (the friction force can be ignored); furthermore, when rotating the test tube cap, no friction force (or the friction force is small and will not damage the test tube cap, so it can be ignored) will be generated between the inclined surface of the inclined surface part 5 and the outer wall of the test tube cap. Furthermore, it is ensured that the resultant force of the force exerted by the inclined surface part 5 on the test tube cap is directed towards the central axis of the test tube cap, improving the stability of the mechanism during actual use.

[0076] It should be added that the above experimental steps include (but are not limited to) placing test tube caps of different specifications and materials between the two clamping members, clamping the test tube caps several times through the clamping members, and finally observing and recording the damage conditions of the test tube caps.

[0077] Based on the same inventive concept, an embodiment of the present application further provides a switch cover device, which includes the clamping mechanism applicable to the test tube cap proposed in any of the foregoing, and a rotation driving member for driving the rotation of the rotating member 2; in actual use, the test tube cap is fixed by the above clamping mechanism, and then the test tube cap is driven to rotate relative to the test tube body by the rotation driving assembly, so as to separate the test tube body from the test tube cap.

[0078] The beneficial effects of the switch cover device provided in this embodiment are the same as those of the clamping mechanism applicable to the test tube cap described above, and will not be elaborated here.

[0079] The above content is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A clamping mechanism applicable to a test tube cap, comprising a bracket and two clamping members; wherein, The bracket is used to be assembled on the fixed surface of the detection instrument, and a rotating member is rotatably connected along the up-and-down direction; the two clamping members are arranged axially symmetrically with the rotation axis of the rotating member as the center; characterized in that the clamping member includes: A vertically extending plate, the upper end of which is slidably connected to the rotating member; the sliding directions of the two vertically extending plates are opposite to each other, so as to be suitable for moving towards each other or moving away from each other; define the adjacent side surfaces of the two vertically extending plates as their clamping surfaces; A sharp edge part, integrally connected to the vertically extending plate and located on the corresponding clamping surface, the tip of which is used to contact the outer peripheral wall of the test tube cap; and An inclined surface part, integrally connected to the vertically extending plate and arranged side by side with the sharp edge part in the horizontal direction on the corresponding clamping surface; in the direction of the corresponding clamping surface facing the rotation axis of the rotating member, the inclined surface of the inclined surface part inclines in the direction away from the sharp edge part, and the inclined surface is used to contact the outer peripheral wall of the test tube cap; Wherein, when the vertically extending plate moves towards the test tube cap, the sharp edge part and the inclined surface part are suitable for contacting the test tube cap at the same time, and the tip of the sharp edge part and the inclined surface both face the central axis of the test tube cap; when the two vertically extending plates move towards the test tube cap at the same time, the two sharp edge parts and the two inclined surface parts are all suitable for being axially symmetric with the central axis of the rotating member.

2. The clamping mechanism applicable to a test tube cap according to claim 1, characterized in that, A reset member is provided between the two vertically extending plates, and the reset member is used to drive the two vertically extending plates to move towards each other so that the sharp edge part and the inclined surface part contact the test tube cap.

3. The clamping mechanism applicable to a test tube cap according to claim 2, wherein, The reset member includes: A limiting rod, arranged between the two vertically extending plates, and the two ends thereof are respectively corresponding to the two vertically extending plates one by one; and Two tension springs, respectively fixedly connected to the two ends of the limiting rod, and each tension spring is connected to the corresponding vertically extending plate; Wherein, when the sharp edge part and the inclined surface part corresponding to the two clamping members contact the test tube cap at the same time, the two tension springs are both in the normal state or the stretched state at the same time.

4. The clamping mechanism applicable to a test tube cap according to claim 2 or 3, characterized in that, Two sliding rails extending outward in opposite directions are provided on the rotating member, and the two sliding rails correspond to the two vertically extending plates one by one; each vertically extending plate further includes: A slider, suitable for being slidably fitted on the corresponding sliding rail and fixedly connected to the upper end of the vertically extending plate; Wherein, the reset member is connected to the slider to drive the vertically extending plate to move through the slider.

5. The clamping mechanism applicable to a test tube cap according to claim 4, characterized in that, Blocking parts are provided on the adjacent side surfaces of the two sliders; when the sharp edge part and the inclined surface part corresponding to the two clamping members contact the test tube cap at the same time, the two blocking parts are in contact with each other to limit the two vertically extending plates from continuing to move towards each other.

6. The clamping mechanism applicable to a test tube cap according to claim 5, characterized in that, The bracket further includes: A transmission rod, slidably connected to the bracket along the up-and-down direction and coaxially inserted into the rotating member, the lower end of which is located above the two blocking parts; a conical block suitable for being inserted between the two blocking parts is connected to the lower end of the transmission rod; and A linear motor, fixedly connected to the bracket, located above the transmission rod, and the power output end thereof is arranged downward; Wherein, the linear motor is used to drive the transmission rod to move downward from top to bottom, so that the conical block is inserted between the two blocking parts and overcomes the reset member to drive the two blocking parts to move away from each other.

7. The clamping mechanism applicable to a test tube cap according to claim 6, characterized in that, The blocking part is a roller rotatably connected to the corresponding slider; the rotation axis of the roller is parallel to the horizontal direction and perpendicular to the sliding direction of the vertical extension plate; When the sharp edge parts and the inclined surface parts corresponding to the two clamping members simultaneously contact the test tube cap, the outer peripheral walls of the two rollers are in contact with each other to limit the two vertical extension plates from continuing to move towards each other.

8. The clamping mechanism applicable to a test tube cap according to claim 1, characterized in that, The clamping member further includes: A hook part, fixedly connected to the lower end of the vertical extension plate and located on the clamping surface, for abutting against the lower edge of the test tube cap so that the test tube cap moves synchronously with the upward movement of the vertical extension plate.

9. The clamping mechanism applicable to a test tube cap according to claim 1, characterized in that, The surface roughness Ra of the inclined surface is ≤6.4um.

10. Switch cover device, characterized in that, It includes the clamping mechanism applicable to the test tube cap according to any one of claims 1-9, and a rotation driving member for driving the rotating member to rotate.

Images