Sample needle detection device

Abstract

The utility model provides a sample needle detection device, including the fixed module for fixing sample needle, sliding piece sets up on first guide piece, second guide piece is fixed on the sliding piece, the fixed module moves along second guide piece, connecting piece is used for connecting fixed module and second guide piece, spring sets up between fixed module and second guide piece, when spring is compressed, connecting piece and fixed module have relative movement, switch sets up on the upside of fixed module. The utility model has the advantages of high detection success rate, simple structure and the like.

Description

Technical Field

[0001] This utility model relates to liquid sampling, and more particularly to a sampling needle detection device. Background Technology

[0002] In fields such as water quality analysis and biochemical analysis, sampling needles are used to transfer various liquids, such as samples and reagents. To protect the sampling needle during application, it is necessary to monitor for potential impacts in real time.

[0003] Currently, the detection method involves detecting the instantaneous increase in stall current of the sample needle lifting motor after a collision, caused by external force blocking the motor. This signal of potential collision is indirectly obtained by detecting the current in the drive circuit. This method is susceptible to false alarms and inaccurate detection. Summary of the Invention

[0004] To address the shortcomings of the existing technical solutions, this utility model provides a sample dispensing needle detection device.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A sampling needle detection device includes a fixing module for fixing the sampling needle; the sampling needle detection device further includes:

[0007] A first guide member and a slider member, wherein the slider member is disposed on the first guide member;

[0008] A second guide member is fixed to the sliding member, and the fixing module moves along the second guide member;

[0009] A connector and a spring, the connector being used to connect the fixing module and the second guide, the spring being disposed between the fixing module and the second guide, the connector and the fixing module having relative movement when the spring is compressed;

[0010] A switch is disposed on the upper side of the fixed module.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] The impact pin detection features a high success rate, low false alarm rate, compact structure, and low cost. At the same time, the spring design allows for relative sliding between the sample dispensing needle and the second guide, which to some extent protects the sample dispensing needle from damage during impact. Attached Figure Description

[0013] The disclosure of this utility model will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are merely illustrative of the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. In the drawings:

[0014] Figure 1 This is a simplified structural diagram of the sampling needle detection device according to this utility model. Detailed Implementation

[0015] Figure 1 The following description illustrates optional embodiments of the present invention to teach those skilled in the art how to implement and reproduce it. For the purpose of teaching the technical solutions of the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art should understand that variations or substitutions derived from these embodiments will be within the scope of the present invention. Those skilled in the art should understand that the following features can be combined in various ways to form multiple variations of the present invention. Therefore, the present invention is not limited to the following optional embodiments, but is defined only by the claims and their equivalents.

[0016] Example 1.

[0017] The sampling needle detection device of this utility model embodiment, such as Figure 1 As shown, it includes:

[0018] Fixing module 6 for fixing the sampling needle 2;

[0019] Sliding member 1 is disposed on the first guide member 8;

[0020] The second guide is fixed on the slider 1, and the fixing module 6 moves along the second guide;

[0021] The connector 3 is used to connect the fixing module 6 and the second guide. The spring 4 is disposed between the fixing module 6 and the second guide. When the spring 4 is compressed, the connector 3 and the fixing module 6 have relative movement.

[0022] Switch 5 is located on the upper side of the fixed module 6.

[0023] In order to move along the second guide and trigger switch 5, the fixing module 6 further includes:

[0024] The first part 61 is disposed in the guide through hole of the second guide member, and has a channel inside that allows the sample needle 2 to pass through; the second part 62 is connected to the first part 61, and the sample needle 2 is fixed on the second part 62; the switch 5 is disposed on the upper side of the first part 61.

[0025] To connect the first part 61 and the second part 62, the first part 61 further has an internal thread, and the second part 62 has an external thread that matches the internal thread.

[0026] To reduce structural complexity, the connector 3 is further made of screws, with one end fixedly connected to the second guide and the other end passing through the fixing module 6 and blocked by the fixing module 6.

[0027] To prevent the spring 4 from shifting, the bottom of the second guide member has a groove, one end of the connector 3 is fixed in the groove, and the spring 4 is disposed in the groove.

[0028] Example 2.

[0029] According to the application example of the sampling needle detection device in biochemical analysis in Embodiment 1 of this utility model.

[0030] In this application example, such as Figure 1 As shown, the slider 1 and the second guide are shared. The slider 1 is mounted on the first guide 8, which is a linear guide rail. The slider 1 has a cylindrical channel (guide channel) at its center and two grooves at its lower part.

[0031] The sampling needle 2 is fixed to the second part 62 of the fixing module 6. The external thread of the second part 62 matches and connects with the internal thread of the first part 61. The outer wall of the first part 61 is cylindrical, and its outer diameter is the same as the inner diameter of the channel. The first part 61 has a channel that allows the sampling needle 2 to pass through. The radius of the bottom of the second part 62 is larger than the radius of the cylindrical channel, and it has two through holes.

[0032] Two connecting pieces 3 are stepped screws, which pass through the through holes and are fixed in the grooves. A spring 4 is located outside the screws and between the sliding piece 1 and the second part 62, partially within the groove, preventing the sliding piece 1 and the second part 62 from approaching each other.

[0033] The micro switch 5 is located on the upper side of the first part 61.

[0034] The working principle of the detection device in this embodiment is as follows:

[0035] The driving unit drives the slider 1 to translate along the first guide, that is, the sample needle 2 translates vertically downward along the first guide 8.

[0036] During the translation of slider 1, the sampling needle 2 impacts the needle. However, slider 1 continues to translate downwards under the drive, at which point spring 4 is compressed.

[0037] When the compression of spring 4 exceeds the threshold, the second part 62 moves upward within the cylindrical channel of slider 1 and triggers switch 5, causing the drive unit to stop working, thereby protecting the sample needle 2.

[0038] Example 3.

[0039] According to the application example of the sampling needle detection device in water quality analysis in Embodiment 1 of this utility model.

[0040] 1. The second guide component is set separately and fixed on the sliding component.

[0041] 2. The fixed module uses a single component, that is, the first part and the second part are combined into one part.

Claims

1. A sampling needle detection device, comprising a fixing module for fixing the sampling needle; characterized in that, The sampling needle detection device also includes: A first guide member and a slider member, wherein the slider member is disposed on the first guide member; A second guide member is fixed to the sliding member, and the fixing module moves along the second guide member; A connector and a spring, the connector being used to connect the fixing module and the second guide, the spring being disposed between the fixing module and the second guide, the connector and the fixing module having relative movement when the spring is compressed; A switch is disposed on the upper side of the fixed module.

2. The sampling needle detection device according to claim 1, characterized in that, The fixing module includes: The first part is disposed within the guide through hole of the second guide member and has an internal channel that allows the sampling needle to pass through; the second part is connected to the first part and the sampling needle is fixed to the second part; the switch is disposed on the upper side of the first part.

3. The sampling needle detection device according to claim 2, characterized in that, The first part has an internal thread, and the second part has an external thread that matches the internal thread.

4. The sampling needle detection device according to claim 2, characterized in that, The channel is cylindrical.

5. The sampling needle detection device according to claim 1, characterized in that, The connector is made of screws, with one end fixedly connected to the second guide, and the other end passing through the fixing module and blocked by the fixing module.

6. The sampling needle detection device according to claim 1, characterized in that, The spring is located on the outside of the connector.

7. The sampling needle detection device according to claim 1 or 6, characterized in that, The bottom of the second guide member has a groove, one end of the connector is fixed in the groove, and the spring is disposed in the groove.

8. The sampling needle detection device according to claim 1, characterized in that, The slider and the second guide are shared.

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