Anti-collision needle assembly

Abstract

The utility model provides an anti-collision needle assembly which comprises a base assembly, a sample adding needle, a first conducting strip, a second conducting strip and a detection circuit, the first conducting strip is arranged on the base assembly, the second conducting strip is arranged on the sample adding needle, and the first conducting strip and the second conducting strip respectively form two detection ends of the detection circuit. The first conducting strip and the second conducting strip are oppositely arranged in the axial direction and spaced by a preset distance, so that the detection circuit is a normally open circuit loop in the initial state, the second conducting strip can move towards the first conducting strip and abut against the first conducting strip, the detection circuit is conducted, and the first conducting strip and / or the second conducting strip can be forced to generate elastic deformation. According to the utility model, the sample adding needle can be allowed to swing by a certain angle and / or axially move by a certain distance within a certain time after collision, so that the sample adding needle is ensured not to be damaged.

Description

Technical Field

[0001] The utility model relates to the field of medical devices, in particular to an anti-collision needle assembly. Background Art

[0002] Many immunochemical analyzers on the market typically use a pipetting arm to add reagents. During this process, the pipetting arm typically moves horizontally and vertically to reach the target position. A pipetting needle at the end of the arm then aspirates or injects the reagent or sample into a reaction cup for testing. The reaction cup is typically small, and the pipetting needle suspended from the pipetting arm is thin and long, with numerous movement options. Human error or instrument malfunction during testing can cause the needle to collide with other components, potentially damaging it.

[0003] The existing technology sets a sensor on the sample needle to detect the signal change caused by the change of the sample needle position during collision, and transmits the detection signal to the main control, triggering the main control to control the sample needle to stop moving. For example, there is an existing anti-collision needle, which forms a normally closed circuit with the control module through two electrode sheets tightly attached to each other. Once the needle collides, the electrical conductivity between the two electrode sheets will change, which will be detected by the control module. The control module immediately stops the movement of the anti-collision needle to prevent damage to the equipment. However, this solution does not take into account the response time and inertia issues. When the needle collides, it takes a certain amount of time for the control module to detect the change in circuit conductivity and control the anti-collision needle to stop moving. Moreover, due to the existence of inertia, after the control module sends a stop movement command to the anti-collision needle, the anti-collision needle will continue to move a certain distance, resulting in the risk of the needle being damaged. Utility Model Content

[0004] The utility model aims to provide an anti-collision needle assembly which can effectively prevent a sample adding needle from being damaged.

[0005] In order to achieve the above-mentioned purpose, the utility model provides an anti-collision needle assembly, including a base assembly, a sample adding needle, a first conductive sheet, a second conductive sheet and a detection circuit. The first conductive sheet is arranged on the base assembly, and the second conductive sheet is arranged on the sample adding needle. The first conductive sheet and the second conductive sheet respectively constitute the two detection ends of the detection circuit. The first conductive sheet and the second conductive sheet are arranged relative to each other in the axial direction and spaced a preset distance apart, so that in the initial state the detection circuit is a normally open circuit loop, and the second conductive sheet can move toward the first conductive sheet and abut against the first conductive sheet, so that the detection circuit is turned on and can force the first conductive sheet and / or the second conductive sheet to produce elastic deformation.

[0006] It can be seen from the above scheme that before the sample adding needle collides, the first conductive sheet and the second conductive sheet are separated by a preset distance, and space is reserved for the second conductive sheet to move toward the first conductive sheet, so that the detection circuit is a normally open circuit loop; when the sample adding needle collides, the sample adding needle drives the second conductive sheet to move, so that the second conductive sheet contacts the first conductive sheet, thereby realizing the conduction of the detection circuit and triggering the controller of the external device to control the sample adding needle to stop moving. Due to inertia, after the controller controls the sample adding needle to stop moving, the sample adding needle will continue to move a certain distance. At this time, since the first conductive sheet and / or the second conductive sheet can undergo elastic deformation, the elastic deformation can play a role of buffering and unloading, which can effectively prevent the sample adding needle from being damaged and play a role of protecting the sample adding needle.

[0007] A further solution is that a first contact is provided on the first conductive sheet, the first contact has a first connection end and a first free end, and the first free end can elastically swing around the first connection end; a second contact is provided on the second conductive sheet, the second contact is provided corresponding to the first contact, the second contact has a second connection end and a second free end, and the second free end can elastically swing around the second connection end.

[0008] It can be seen from the above solution that the above arrangement is conducive to achieving elastic deformation of the first conductive sheet and the second conductive sheet.

[0009] A further solution is that a detour portion is connected between the first connecting end and the first free end, and the second contact is arranged corresponding to the first free end and / or the detour portion.

[0010] It can be seen from the above solution that the above arrangement is conducive to increasing the contact area between the two, ensuring that the second contact point can contact the first contact point when an oblique collision occurs.

[0011] A further solution is that both the first contact and the second contact are provided in plurality, and the plurality of second contacts are respectively provided around the radial direction of the sample injection needle, and the plurality of first contacts and the plurality of second contacts are provided in one-to-one correspondence, and the detection circuit can be turned on when at least one first contact contacts the corresponding second contact.

[0012] It can be seen from the above scheme that through the above setting, when the sampling needle collides radially, at least one first contact can contact the corresponding second contact. At this time, the detection circuit is turned on, which can trigger the external controller to control the sampling needle to stop moving; when the sampling needle collides axially, multiple first contacts can contact the corresponding second contacts at the same time. At this time, the detection circuit is turned on, which can trigger the external controller to control the sampling needle to stop moving.

[0013] A further solution is that a universal joint and an elastic member are provided in the base assembly, the universal joint is sleeved on the sampling needle and can move with the sampling needle, and when the sampling needle collides, the universal joint can be forced to move radially and / or axially in the base assembly, and the elastic member elastically abuts between the universal joint and the base assembly, so that the universal joint can automatically return to its initial position after movement.

[0014] It can be seen from the above scheme that by setting the universal joint, the sample needle can generate a needle protection signal in time when it hits an obstacle in any direction; by setting the elastic part, on the one hand, the sample needle can automatically return to its initial position after a radial or axial collision, and on the other hand, the elastic part can also play a role of buffering and unloading force, which is conducive to preventing the sample needle from being damaged.

[0015] A further solution is that the base assembly is provided with a cavity, a first through-hole and a second through-hole, and the first through-hole and the second through-hole are respectively and communicatively arranged at the two axial ends of the cavity; the universal joint is provided with a first sleeve portion, a ball head portion and a second sleeve portion in sequence along the axial direction, the first sleeve portion is inserted into the first through-hole, and a first radial gap is formed between the outer wall of the first sleeve portion and the hole wall of the first through-hole, the ball head portion is movably arranged in the cavity, and the second sleeve portion is inserted into the second through-hole, and a second radial gap is formed between the outer wall of the second sleeve portion and the hole wall of the first through-hole.

[0016] It can be seen from the above solution that the above arrangement is conducive to the radial tilting movement of the universal joint following the sample addition needle.

[0017] A further solution is that the base assembly is provided with a stop surface on the periphery of the first through-hole, and the elastic member elastically abuts between the ball head and the stop surface.

[0018] It can be seen from the above solution that the above arrangement is conducive to the universal joint following the axial movement of the sample addition needle.

[0019] A further solution is that the base assembly and the universal joint are both made of insulating material.

[0020] As can be seen from the above scheme, the above setting can avoid the occurrence of circuit breakage in the detection circuit, which is conducive to ensuring reliable transmission of electrical signals.

[0021] A further solution is that a first mounting portion is provided on the top wall of the base assembly so as to protrude upward, and the first conductive plate is sleeved on the outer side of the universal joint and connected to the first mounting portion; a second mounting portion is provided on the upper part of the universal joint, the second conductive plate is sleeved on the outer side of the universal joint and connected to the second mounting portion, and the second conductive plate is provided between the first conductive plate and the top wall of the base assembly.

[0022] A further solution is that a fastening sleeve and a flange are provided on the upper part of the sample addition needle, one end of the fastening sleeve is fixedly connected to the flange, and the other end of the fastening sleeve passes through the first conductive sheet and abuts against the second conductive sheet, and the fastening sleeve is made of insulating material. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of an embodiment of the present utility model.

[0024] Figure 2 It is an exploded view of an embodiment of the present utility model.

[0025] Figure 3 It is a structural diagram of the first conductive sheet and the second conductive sheet in an embodiment of the present utility model.

[0026] Figure 4 It is a cross-sectional view of an embodiment of the present invention when a radial collision occurs.

[0027] Figure 5 It is a schematic diagram of an embodiment of the present invention when a radial collision occurs.

[0028] Figure 6 It is a schematic diagram of an embodiment of the present invention when an axial collision occurs.

[0029] Figure 7 It is a cross-sectional view of an embodiment of the present invention when an axial collision occurs.

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] Description of reference numerals:

[0032] 1-base assembly, 11-base, 111-cavity, 112-first through-hole, 113-stop surface, 114-first mounting portion, 12-bottom plate, 121-second through-hole;

[0033] 2-sample needle;

[0034] 3-first conductive sheet, 31-first contact point, 311-first connecting end, 312-first free end, 313-detour portion;

[0035] 4-second conductive sheet, 41-second contact point, 411-second connecting end, 412-second free end;

[0036] 5-universal joint, 51-ball head, 53-first sleeve portion, 52-second sleeve portion, 54-second mounting portion, 55-third sleeve portion;

[0037] 6- elastic member;

[0038] 7- Fastening sleeve;

[0039] 8-Flange. DETAILED DESCRIPTION

[0040] See also Figures 1 to 3 The present embodiment provides an anti-collision needle assembly, comprising a base assembly 1, a sample needle 2, a first conductive sheet 3, a second conductive sheet 4, and a detection circuit (not shown in the figure). The first conductive sheet 3 is disposed on the base assembly 1, and the second conductive sheet 4 is disposed on the sample needle 2 and can follow the movement of the sample needle 2. The first conductive sheet 3 and the second conductive sheet 4 respectively constitute the two detection ends of the detection circuit. The first conductive sheet 3 and the second conductive sheet 4 are both welded with signal lines (not shown in the figure), and both signal lines are connected to an external controller. When the first conductive sheet 3 and the second conductive sheet 4 are in contact, the detection circuit is turned on. The controller detects a change in the electrical signal of the detection circuit and can control the sample needle to stop moving and issue an alarm. When the first conductive sheet 3 and the second conductive sheet 4 are separated, the detection circuit is disconnected.

[0041] In this embodiment, the first conductive sheet 3 and the second conductive sheet 4 are arranged opposite each other in the axial direction of the sample needle 2 and separated by a predetermined distance d. Specifically, the second conductive sheet 4 is arranged below the first conductive sheet 3, so that in the initial state, the detection circuit is a normally open circuit loop. This initial state refers to the state before the sample needle 2 collides. When the sample needle 2 collides, the second conductive sheet 4 can move toward the first conductive sheet 3 and abut against it, turning on the detection circuit. At this time, the external controller detects the change in the electrical signal of the detection circuit, controls the sample needle 2 to stop moving, and issues an alarm.

[0042] During the response time from when the controller detects the change in the electrical signal of the detection circuit to when the sample needle 2 stops moving, and when the controller stops the sample needle 2, the sample needle 2 will continue to move due to inertia, causing the sample needle 2 to be continuously hit by the collision object and even break and damage. In order to prevent the sample needle 3 from being damaged, when the second conductive sheet 4 abuts against the first conductive sheet 3, the first conductive sheet 3 and / or the second conductive sheet 4 can be forced to produce elastic deformation to play a role in buffering and unloading force. Specifically:

[0043] The first conductive sheet 3 is made of an elastic conductive metal material. The middle portion of the first conductive sheet 3 is hollowed out, allowing the first conductive sheet 3 to be sleeved onto the outside of the sample needle 2. A plurality of first contacts 31 are disposed in the middle portion of the first conductive sheet 3. The plurality of first contacts 31 are disposed radially around the sample needle 2. In this embodiment, four first contacts 31 are used as an example, and the four first contacts 31 are evenly spaced around the sample needle 2. The first contact 31 has a first connection end 311 and a first free end 312. The first connection end 311 is fixedly connected to the first conductive sheet 3, and the first free end 312 can elastically swing around the first connection end 311, preferably in an axial direction. The first conductive sheet 3 and the first contact 31 are integrally formed.

[0044] The second conductive sheet 4 is made of a resilient conductive metal material. A mounting hole is defined in the middle of the second conductive sheet 4, and the sample injection needle 2 is disposed within the mounting hole. A plurality of second contacts 41 are disposed on the second conductive sheet 4, each corresponding to the plurality of first contacts 31. The second contacts 41 have a second connection end 411 and a second free end 412. The second connection end 411 is fixedly connected to the second conductive sheet 4, and the second free end 412 extends downwardly and axially. The second free end 412 can elastically swing about the second connection end 411, preferably in an axial direction. The second conductive sheet 4 and the second contact 41 are integrally formed.

[0045] To increase the contact surface between the second contact 41 and the first contact 31 without affecting their elastic swinging ability, this embodiment includes a detour portion 313 connected between the first connection end 311 and the first free end 312. The detour portion 313 can be configured as a "U"-shaped structure or an arc-shaped structure. The width of the detour portion 313 is substantially equal to the width of the first connection end 311 and the width of the first free end 312. The second contact 41 is arranged corresponding to the first free end 312 and / or the detour portion 313. In other words, the second contact 41 can contact the first free end 312, the detour portion 313, or both the first free end 312 and the detour portion 313.

[0046] In this embodiment, when at least one first contact 31 contacts the corresponding second contact 41 , the detection circuit is turned on. That is, the four first contacts 31 are arranged in parallel in the detection circuit.

[0047] Combine Figure 2 and Figure 4 , a universal joint 5 and an elastic member 6 are provided in the base assembly 1. The universal joint 5 is sleeved on the outside of the sample injection needle 2 and can move with the sample injection needle 2. When the sample injection needle 2 collides, it can force the universal joint 5 to move radially and tilted and / or axially in the base assembly 1. The elastic member 6 is preferably a tower spring, which is sleeved on the outside of the universal joint 5. The elastic member 6 elastically abuts between the universal joint 5 and the base assembly 1, so that the universal joint 5 can automatically return to its initial position after radially tilting and / or axially moving. The initial position refers to the position when the axis of the universal joint 5 is parallel to the axis of the base assembly 1, and the first conductive sheet 3 and the second conductive sheet 4 are spaced apart by a distance d.

[0048] Furthermore, the base assembly 1 is provided with a cavity 111, a first through-hole 112, and a second through-hole 121. The first through-hole 112 and the second through-hole 121 are respectively and communicatively provided at the axial ends of the cavity 111, and the first through-hole 112 and the second through-hole 121 are coaxially arranged. Specifically, the base assembly 1 includes a base 11 and a bottom plate 12, the bottom plate 12 is connected to the lower portion of the base 11, the cavity 111 and the first through-hole 112 are both provided on the base 11, and the second through-hole 121 is provided on the bottom plate 12.

[0049] The universal joint 5 is provided with a ball head 51, a first sleeve portion 53, and a second sleeve portion 52. The ball head 51 is connected between the first sleeve portion 53 and the second sleeve portion 52. The first sleeve portion 53 is inserted into the first through-hole 112, with a first radial gap between the outer wall of the first sleeve portion 53 and the wall of the first through-hole 112. The second sleeve portion 52 is inserted into the second through-hole 121, with a second radial gap between the outer wall of the second sleeve portion 52 and the wall of the second through-hole 121. The ball head 51 is movably disposed within the cavity 111 and is adjacent to the base plate 12. The universal joint 5 can tilt radially within the cavity 111. The base 11 is provided with a stop surface 113 on the outer periphery of the first through-hole 112. The elastic member 6 elastically abuts between the ball head 51 and the stop surface 113, allowing the universal joint 5 to elastically move axially.

[0050] The top wall of the base assembly 1 is provided with four first mounting portions 114 protruding upward. The four first mounting portions 114 are respectively provided on the four corners of the base 11 . The first conductive sheet 3 is sleeved on the outside of the universal joint 5 and connected to the first mounting portions 114 .

[0051] The universal joint 5 is further provided with a second mounting portion 54 and a third sleeve portion 55. The second mounting portion 54 is provided above the first sleeve portion 53, and the third sleeve portion 55 is provided above the second mounting portion 54. The second conductive sheet 4 is sleeved outside the third sleeve portion 55 and connected to the second mounting portion 54. The second conductive sheet 4 is provided between the first conductive sheet 3 and the top wall of the base assembly 1.

[0052] Combine Figure 4 and Figure 5In the embodiment, when the sample needle 2 moves horizontally to the left and just encounters a collision, the striker time is T0, the interval between the first conductive sheet 3 and the second conductive sheet 4 is d, that is, the first conductive sheet 3 and the second conductive sheet 4 are not in contact, and the detection circuit is not turned on; then, the sample needle 2 continues to move to the left, and is blocked by the collision object, causing the sample needle 2 to tilt and swing to the right, and one side of the second conductive sheet 4 moves closer to the first conductive sheet 3; when the second conductive sheet 4 just contacts the first conductive sheet 3, the detection circuit is turned on, and the striker time is T1, and the sample needle 2 is at its most tilted and swung. The smallest angle is θmin; then, since the controller of the external device has a response time from receiving the change of the electrical signal from the detection circuit to controlling the sample needle 2 to stop moving, during this process, the tilting and swinging angle of the sample needle 2 gradually increases, and the second conductive sheet 4 and the first conductive sheet 3 are deformed and gradually increase; then, the controller of the external device controls the sample needle 2 to stop moving. Due to the influence of inertia, the tilting and swinging angle of the sample needle 2 continues to increase until the sample needle 2 stops completely. At this time, the needle impact time lasts to T2, and the maximum tilting and swinging angle of the sample needle 2 is θmax.

[0053] That is to say, the anti-collision needle assembly of this embodiment can deform the first conductive sheet 3 and the second conductive sheet 4 within T2 time after the collision, so as to allow the sample needle 2 and the second conductive sheet 4 to tilt and swing within the angle range of θmin to θmax, which can effectively ensure that the sample needle 2 will not be damaged.

[0054] Combine Figure 6 and Figure 7 When the sample needle 2 moves axially downward and just encounters a collision, the striker time is T0, the interval between the first conductive sheet 3 and the second conductive sheet 4 is d, that is, the first conductive sheet 3 and the second conductive sheet 4 are not in contact, and the detection circuit is not conductive; then, the sample needle 2 continues to move downward, and under the obstruction of the collision object, the sample needle 2, the universal joint 5 and the second conductive sheet 4 move upward toward the first conductive sheet 4; when the second conductive sheet 4 just contacts the first conductive sheet 3, the detection circuit is conductive, the striker time is T1, and the minimum distance the sample needle 2 moves upward is Smin, Smin=d; then, because the controller of the peripheral device receives the signal from the receiving There is a response time from the time when the electrical signal from the detection circuit changes to the time when the sample needle 2 stops moving. During this process, the sample needle 2 drives the second conductive sheet 4 to continue to move upward, causing the second conductive sheet 4 and the first conductive sheet 3 to deform and gradually increase in size. Then, the external controller controls the sample needle 2 to stop moving. Due to the influence of inertia, the sample needle 2 will continue to move upward for a certain distance and then stop completely. At this time, the impact time lasts until T2, and the maximum upward distance of the sample needle 2 is Smax. At this time, the second conductive sheet 4 is still located below the first conductive sheet 3 to ensure that when the collision object disappears, the sample needle 2 and the second conductive sheet 4 can return to their initial positions.

[0055] That is, the anti-collision needle assembly of this embodiment can allow the sample needle 2 and the second conductive sheet 4 to move axially within the moving distance range Smin to Smax within the time T2 after the collision occurs, which can effectively ensure that the sample needle 2 will not be damaged.

[0056] Combine Figure 2 and Figure 4 In this embodiment, a fastening sleeve 7 and a flange 8 are disposed above the sample injection needle 2. The first end of the fastening sleeve 7 is fixedly connected to the flange 8, while the second end of the fastening sleeve 7 extends downward through the middle of the first conductive sheet 3 to abut against the second conductive sheet 4. In this embodiment, the second mounting portion 54 and the fastening sleeve 7 jointly secure the second conductive sheet 4, thereby preventing the second conductive sheet from moving during movement and preventing accidental contact.

[0057] The base assembly 1 , the universal joint 5 and the fastening sleeve 7 of this embodiment are all made of insulating materials, which is conducive to achieving an insulating design and ensuring reliable transmission of the electrical signal of the detection circuit.

[0058] In summary, it can be seen that in the initial state of the utility model, the first conductive sheet and the second conductive sheet are separated by a preset distance, and space is reserved for the second conductive sheet to move toward the first conductive sheet, so that the detection circuit is a normally open circuit loop; when the sampling needle collides, the sampling needle drives the second conductive sheet to move, so that the second conductive sheet contacts the first conductive sheet, thereby realizing the conduction of the detection circuit and triggering the controller of the external device to control the sampling needle to stop moving. Due to inertia, after the controller controls the sampling needle to stop moving, the sampling needle will continue to move a certain distance. At this time, since the first conductive sheet and / or the second conductive sheet can undergo elastic deformation, the elastic deformation can play a role of buffering and unloading, which can effectively prevent the sampling needle from being damaged and play a role of protecting the sampling needle.

[0059] Finally, it should be emphasized that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An anti-collision needle assembly, comprising a base assembly, a sample needle, a first conductive sheet, a second conductive sheet, and a detection circuit, wherein the first conductive sheet is disposed on the base assembly, the second conductive sheet is disposed on the sample needle, and the first conductive sheet and the second conductive sheet respectively constitute two detection ends of the detection circuit, characterized in that: The first conductive sheet and the second conductive sheet are axially arranged relative to each other and spaced a preset distance apart, so that in an initial state the detection circuit is a normally open circuit loop, and the second conductive sheet can move toward the first conductive sheet and abut against the first conductive sheet, so that the detection circuit is turned on and can force the first conductive sheet and / or the second conductive sheet to produce elastic deformation.

2. The anti-collision pin assembly according to claim 1, characterized in that: The first conductive sheet is provided with a first contact, the first contact having a first connecting end and a first free end, and the first free end can elastically swing around the first connecting end; A second contact is provided on the second conductive sheet. The second contact is provided corresponding to the first contact. The second contact has a second connecting end and a second free end. The second free end can elastically swing around the second connecting end.

3. The anti-collision pin assembly according to claim 2, characterized in that: A detour portion is connected between the first connecting end and the first free end, and the second contact is arranged corresponding to the first free end and / or the detour portion.

4. The anti-collision pin assembly according to claim 2, characterized in that: The first contact and the second contact are both provided in plurality, and the plurality of second contacts are respectively arranged around the radial direction of the sample injection needle. The plurality of first contacts and the plurality of second contacts are arranged in a one-to-one correspondence, and the detection circuit can be turned on when at least one of the first contacts contacts the corresponding second contact.

5. The anti-collision pin assembly according to any one of claims 1 to 4, characterized in that: A universal joint and an elastic member are provided in the base assembly. The universal joint is sleeved on the sample injection needle and can move with the sample injection needle. When the sample injection needle collides, the universal joint can be forced to move radially and tilted and / or axially in the base assembly. The elastic member elastically abuts between the universal joint and the base assembly, so that the universal joint can automatically return to its initial position after movement.

6. The anti-collision pin assembly according to claim 5, characterized in that: The base assembly is provided with a cavity, a first through-hole and a second through-hole, wherein the first through-hole and the second through-hole are respectively and communicatively provided at two axial ends of the cavity; The universal joint is provided with a first sleeve portion, a ball head portion and a second sleeve portion in sequence along the axial direction. The first sleeve portion is inserted into the first through-hole, and a first radial gap is formed between the outer wall of the first sleeve portion and the hole wall of the first through-hole. The ball head portion is movably arranged in the cavity, and the second sleeve portion is inserted into the second through-hole. A second radial gap is formed between the outer wall of the second sleeve portion and the hole wall of the first through-hole.

7. The anti-collision pin assembly according to claim 6, characterized in that: The base assembly is provided with a stop surface on the periphery of the first through-hole, and the elastic member elastically abuts between the ball head and the stop surface.

8. The anti-collision pin assembly according to claim 5, characterized in that: The base assembly and the universal joint are both made of insulating materials.

9. The anti-collision pin assembly according to claim 5, characterized in that: The top wall of the base assembly is provided with a first mounting portion protruding upward, and the first conductive sheet is sleeved on the outside of the universal joint and connected to the first mounting portion; A second mounting portion is provided on the upper portion of the universal joint, the second conductive sheet is sleeved on the outer side of the universal joint and connected to the second mounting portion, and the second conductive sheet is provided between the first conductive sheet and the top wall of the base assembly.

10. The anti-collision pin assembly according to claim 9, characterized in that: A fastening sleeve and a flange are provided on the upper part of the sample addition needle. One end of the fastening sleeve is fixedly connected to the flange, and the other end of the fastening sleeve passes through the first conductive sheet and abuts against the second conductive sheet. The fastening sleeve is made of insulating material.

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