Pipettor for food detection

Abstract

The utility model discloses a pipettor for food detection, which comprises a pipetting gun, a mounting seat and a head changing mechanism, a suction tube is arranged at the end of the pipetting gun in a matching manner, the periphery of the suction tube is detachably connected with a suction head, the head changing mechanism is arranged in the mounting seat, and the suction head is detachably connected with the suction tube. The head changing mechanism comprises an inserting groove, a transverse groove, a fixed clamping ring, a pull rod, an end ring, a spring and a movable clamping ring, the inserting groove is formed in one end of the interior of the mounting base in the vertical direction, and the transverse groove communicating with the interior of the inserting groove is formed in the interior of the mounting base in the horizontal direction; the movable clamping ring is reset and clamped to the periphery of the suction tube together with the fixed clamping ring, meanwhile, the bottom of the movable clamping ring abuts against the top of the suction head, the position of the suction head is limited, the suction head can be pulled out in the upward pulling process of the pipette, and under the condition that residual liquid is left in the suction head, pollution caused by leakage of the residual liquid in the suction head pulling-out process can be avoided; and unnecessary troubles are reduced during continuous detection operation.

Description

Technical Field

[0001] The utility model relates to the technical field of detection test tools, in particular to a pipette for food detection. Background Technique

[0002] Food inspection refers to the research and evaluation of food quality and its changes. It is based on some basic theories of physics, chemistry, and biochemistry and various technologies. According to the formulated technical standards, the quality of food raw materials, auxiliary materials, semi-finished products, finished products, and by-products is inspected to ensure that the product quality is qualified. During the food detection test process, the pipette is one of the commonly used detection test tools.

[0003] The existing pipettes for food detection have the following drawbacks when in use: In the food detection laboratories equipped in food production plants, due to the continuous production operations of the factory, the detection tests of each batch of food are very frequent and compact. During the test process, the pipette is used very frequently. For different test samples or different batches of test samples, when performing pipetting, the pipette tips need to be replaced. When the existing pipette tips are removed, they are generally directly manually removed. When there is residual liquid in the tip, it is very easy to cause contamination of the sterile gloves and the operation table during the process of removing the tip. For this reason, we propose a pipette for food detection. Content of the Utility Model

[0004] The main purpose of the utility model is to provide a pipette for food detection. Through the tip-changing mechanism arranged inside the mounting seat, the tip can be quickly removed under the condition of no manual contact, and at the same time, the inside of the extraction component can be cleaned, which can effectively solve the problems in the background technique.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A pipette for food detection includes a pipette gun, and also includes a mounting seat and a tip-changing mechanism. A suction tube is provided at the end of the pipette gun, and a pipette tip is detachably connected to the outer periphery of the suction tube. The tip-changing mechanism is arranged inside the mounting seat. The tip-changing mechanism includes a slot, a horizontal slot, a fixed clamping ring, a pull rod, an end ring, a spring, and a movable clamping ring. A slot is vertically opened at one end inside the mounting seat, and a horizontal slot communicating with the inside of the slot is horizontally opened inside the mounting seat. A fixed clamping ring is fixedly connected to the inner wall of the slot away from the horizontal slot. A pull rod is inserted into the horizontal slot, and a movable clamping ring corresponding to the position of the fixed clamping ring is bonded to the end of the pull rod. An end ring located inside the horizontal slot is fixedly connected to the outer periphery of the pull rod, and a spring is installed between the end of the inner wall of the horizontal slot and the end ring.

[0007] Furthermore, it also includes a cleaning mechanism. The mounting base houses the cleaning mechanism, which includes a liquid supply connector, a liquid inlet pipe, a cleaning liquid distribution pipe, a nozzle, a fan, an air duct, a heating wire, and an airflow duct. The mounting base has an embedded liquid inlet pipe, with its inlet end screwed to a liquid supply connector located outside the mounting base. A cleaning liquid distribution pipe is installed at the outlet of the liquid inlet pipe. A nozzle is installed at the end of both the cleaning liquid distribution pipe and the liquid inlet pipe, located on the inner wall of the slot. A fan is embedded at the end of the mounting base away from the liquid supply connector, with an air duct at the fan's exhaust end. A heating wire is installed at the end of the air duct near the fan. An airflow distribution pipe is detachably connected to the end of the air duct. Both the airflow distribution pipe and the air duct extend to the insertion point. Inside the slot; the liquid supply connector is used to connect to the external cleaning liquid supply device. Under normal use, both solenoid three-way valves A and B are in the fully closed state. After the suction head is removed inside the slot, control solenoid three-way valve A to open the corresponding pipeline, allowing the cleaning liquid to flow from the inlet pipe or the cleaning liquid distribution pipe, and finally spray it into the slot from the nozzle to clean the clamping components inside the slot. After cleaning, solenoid three-way valve B opens the corresponding pipeline, and the fan and heating wire are powered on. The airflow blown in by the fan is heated by the heating wire and discharged through the air duct, and then transported to the corresponding slot through the air duct or airflow distribution pipe to achieve rapid drying of the clamping components inside the slot, facilitating subsequent operations.

[0008] Furthermore, both the fixed clamping ring and the movable clamping ring have arc-shaped grooves on opposite sides of their surfaces, and the top of the mounting base has an insertion cavity on the side away from the slot. The arc-shaped groove structure allows it to better fit the outer periphery of the suction head and the suction tube, and the insertion cavity structure can be used to insert the suction head to be used, serving as a storage box.

[0009] Furthermore, a discharge groove connected to the inside of the slot is welded to the side of the mounting base near the slot; the removed suction head will slide directly down the discharge groove and be discharged into the interior of the mounting base.

[0010] Furthermore, an electromagnetic three-way valve A is installed at the connection between the inlet pipe and the end of the cleaning liquid diversion pipe, and an electromagnetic three-way valve B is installed at the connection between the air duct and the airflow diversion pipe; the opening and closing of the cleaning liquid flow pipe is controlled by the electromagnetic three-way valve A, and the opening and closing of the airflow flow pipe is controlled by the electromagnetic three-way valve B, and the opening and closing of the corresponding pipe is controlled according to the slot position used.

[0011] Furthermore, a controller is embedded in one side of the mounting base surface. The controller's control terminals are respectively connected to the control terminals of the fan, heating wire, electromagnetic three-way valve A, and electromagnetic three-way valve B. The power supply line of the fan is connected to the controller, and its opening and closing are controlled by a physical on / off button. The power supply line of the heating wire is connected to the controller, and its power supply is adjusted by the controller, thereby regulating its opening, closing, and temperature. The controller drives the internal coil of the electromagnetic three-way valve by outputting an electrical signal to control its on / off state or opening degree, while monitoring the current and feedback signals to achieve closed-loop regulation.

[0012] Compared with the prior art, this utility model has the following advantages: The mounting base is fixed to the workbench by adhesive or fasteners. A slot structure is provided on the top of the mounting base, with a fixed clamping ring and a movable clamping ring inside the slot. During food testing, the pipette tip is inserted into the outer periphery of the suction tube for connection. After assembly, liquid aspiration and drainage are performed. When the pipette tip needs to be replaced, especially when there is still residual liquid inside, the pipette tip can be aligned with the slot and inserted. The outer periphery of the pipette tip fits against the surfaces of the fixed and movable clamping rings and is continuously squeezed during downward pressure, causing the movable clamping ring to move and the spring to compress. When the connection end of the pipette tip and suction tube moves to the connection point of the fixed and movable clamping rings, due to the reduced outer diameter, the spring will drive the movable clamping ring to return to its original position, cooperating with the fixed clamping ring to hold it to the outer periphery of the suction tube. At the same time, the bottom of the fixed and movable clamping rings abuts against the top of the pipette tip. At this time, pulling up the pipette will, due to the restricted position of the pipette tip, allow the pipette tip to move during the upward pulling process. It allows for the removal and discharge of suction tips. Compared to manual removal and replacement, this method avoids the problem of residual liquid leaking out and contaminating gloves and work surfaces during the removal and replacement process, especially when there is residual liquid inside the suction tip. This reduces unnecessary trouble during continuous testing operations. The liquid supply connector is used to connect to an external cleaning liquid supply device. Under normal use, both solenoid three-way valves A and B are in the fully closed state. After the suction tip is removed from the slot, control solenoid three-way valve A to open the corresponding pipeline, allowing the cleaning liquid to flow from the inlet pipe or cleaning liquid distribution pipe, and finally spray it into the slot from the nozzle to clean the clamping components inside the slot. After cleaning, solenoid three-way valve B opens the corresponding pipeline, and the fan and heating wire are powered on. The airflow blown in by the fan is heated by the heating wire and discharged through the air duct, and then delivered to the corresponding slot through the air duct or airflow distribution pipe to achieve rapid drying of the clamping components inside the slot, facilitating subsequent operations. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of a pipette for food testing according to the present invention.

[0014] Figure 2This is a schematic diagram of the internal structure of the mounting base for a pipette used in food testing according to this utility model.

[0015] Figure 3 This is a schematic diagram of the structure of a pipette tip for food testing according to this utility model during the insertion into the slot.

[0016] Figure 4 This is a schematic diagram of the structure of a pipette tip for food testing according to this utility model after it has been inserted into the insertion slot.

[0017] In the diagram: 1. Pipette; 101. Suction tube; 102. Suction tip; 2. Mounting base; 3. Head changing mechanism; 301. Slot; 302. Horizontal groove; 303. Fixed clamping ring; 304. Pull rod; 305. End ring; 306. Spring; 307. Movable clamping ring; 308. Arc groove; 309. Insertion cavity; 310. Discharge trough; 4. Cleaning mechanism; 401. Liquid supply connector; 402. Liquid inlet pipe; 403. Cleaning liquid diversion pipe; 404. Nozzle; 405. Solenoid three-way valve A; 406. Fan; 407. Air duct; 408. Heating wire; 409. Airflow diversion pipe; 410. Solenoid three-way valve B; 411. Controller. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0019] like Figure 1-4 As shown, a pipette for food testing includes a pipette 1, a mounting base 2, and a tip-changing mechanism 3. The pipette 1 has a suction tube 101 at its end, and a tip 102 is detachably connected to the outer periphery of the suction tube 101. The mounting base 2 houses the tip-changing mechanism 3, which includes a slot 301, a transverse groove 302, a fixing clamping ring 303, a pull rod 304, an end ring 305, a spring 306, and a movable clamping ring 307. A slot 301 is vertically formed at one end of the mounting base 2. 1. The mounting base 2 has a horizontal groove 302 that communicates with the inside of the slot 301. A fixed clamping ring 303 is fixedly connected to the inner wall of the slot 301 away from the horizontal groove 302. A pull rod 304 is inserted into the horizontal groove 302 and a movable clamping ring 307 corresponding to the position of the fixed clamping ring 303 is glued to the end of the pull rod 304. An end ring 305 located inside the horizontal groove 302 is fixedly connected to the outer periphery of the pull rod 304, and a spring 306 is installed between the end of the inner wall of the horizontal groove 302 and the end ring 305.

[0020] The system also includes a cleaning mechanism 4, which is housed inside the mounting base 2. The cleaning mechanism 4 includes a liquid supply connector 401, a liquid inlet pipe 402, a cleaning liquid distribution pipe 403, a nozzle 404, a fan 406, an air duct 407, a heating wire 408, and an airflow duct. The liquid inlet pipe 402 is embedded inside the mounting base 2, and its inlet end is screwed to the liquid supply connector 401 located outside the mounting base 2. The liquid inlet pipe 402 discharges a cleaning liquid... The cleaning fluid distribution pipe 403 and the inlet pipe 402 are both equipped with nozzles 404 located on the inner wall of the slot 301. A fan 406 is embedded inside the mounting base 2 at the end away from the liquid supply connector 401, and an air duct 407 is provided at the exhaust end of the fan 406. A heating wire 408 is installed inside the air duct 407 near the end of the fan 406. An airflow distribution pipe 409 is detachably connected to the end of the air duct 407. The airflow distribution pipe 409 and the air duct... The ends of 407 extend into the slot 301; the liquid supply connector 401 is used to connect to an external cleaning liquid supply device. In normal use, both the solenoid three-way valve A405 and the solenoid three-way valve B410 are fully closed. After the suction head 102 is removed from inside the slot 301, the solenoid three-way valve A405 is controlled to open the corresponding pipeline, allowing the cleaning liquid to flow from the inlet pipe 402 or the cleaning liquid distribution pipe 403, and finally be sprayed into the slot from the nozzle 404. Inside slot 301, the clamping components inside slot 301 are sprayed and cleaned. After cleaning, the electromagnetic three-way valve B410 opens the corresponding pipeline, and the fan 406 and heating wire 408 are powered on. The airflow blown in by the fan 406 is heated by the heating wire 408 and discharged through the air duct 407. Then, it is delivered to the slot 301 inside the corresponding position through the air duct 407 or the airflow diversion pipe 409, so as to achieve rapid drying of the clamping components inside slot 301, which facilitates subsequent operations.

[0021] The fixed clamping ring 303 and the movable clamping ring 307 each have an arc-shaped groove 308 on their opposite sides. The top of the mounting base 2 has an insertion cavity 309 on the side away from the slot 301. The side of the mounting base 2 near the slot 301 has a discharge groove 310 that communicates with the inside of the slot 301. The arc-shaped groove 308 structure allows it to better fit the outer periphery of the suction head 102 and the suction tube 101. The insertion cavity 309 structure can be used to insert the suction head 102 to be used, which acts as a storage box. After being removed, the suction head 102 will slide directly down the discharge groove 310 and be discharged into the interior of the mounting base 2.

[0022] A solenoid three-way valve A405 is installed at the connection between the inlet pipe 402 and the end of the cleaning fluid diversion pipe 403, and a solenoid three-way valve B410 is installed at the connection between the air duct 407 and the airflow diversion pipe 409. A controller 411 is embedded in one side of the surface of the mounting base 2. The control terminals of the controller 411 are respectively connected to the control terminals of the fan 406, the heating wire 408, the solenoid three-way valve A405, and the solenoid three-way valve B410. The opening and closing of the cleaning fluid flow pipeline is controlled by the solenoid three-way valve A405, and the flow is controlled by electricity. The magnetic three-way valve B410 controls the opening and closing of the airflow pipeline. It controls the opening and closing of the corresponding pipeline according to the position of the slot 301. The power supply line of the fan 406 is connected to the controller 411, and its opening and closing are controlled by the physical on / off button. The power supply line of the heating wire 408 is connected to the controller 411, and the controller 411 adjusts its power supply, thereby regulating its opening, closing and temperature. The controller 411 drives the internal coil of the electromagnetic three-way valve by outputting an electrical signal to control its on / off state or opening degree, and at the same time monitors the current and feedback signals to achieve closed-loop regulation.

[0023] It should be noted that this utility model is a pipette for food testing. In use, the mounting base 2 is fixed to the work surface by adhesive or fasteners. A slot 301 structure is provided on the top of the mounting base 2. Inside the slot 301 are a fixed clamping ring 303 and a movable clamping ring 307 corresponding to their positions. During food testing, the pipette tip 102 is inserted into the outer periphery of the end of the suction tube 101 for connection. After assembly, liquid aspiration and drainage are performed. When the pipette tip 102 is finished and needs to be replaced, especially when there is still residual liquid inside the pipette tip 102, the pipette tip 102 can be aligned with the slot 301 and... When inserted, the outer periphery of the suction tip 102 adheres to the surfaces of the fixed clamping ring 303 and the movable clamping ring 307, and is continuously squeezed during the downward pressing process. This causes the movable clamping ring 307 to be squeezed, and the spring 306 to be compressed. When the connection end of the suction tip 102 and the suction tube 101 moves to the connection point of the fixed clamping ring 303 and the movable clamping ring 307, due to the reduction in outer diameter, the spring 306 will drive the movable clamping ring 307 to return to its original position, cooperating with the fixed clamping ring 303 to clamp the outer periphery of the suction tube 101. At the same time, the bottoms of the fixed clamping ring 303 and the movable clamping ring 307 abut against the top of the suction tip 102. At this time, the pipette 1 is pulled up. Because the position of the suction tip 102 is restricted, The pipette tip 102 can be removed and ejected during the upward pull of pipette 1. Compared to manual removal and replacement, this method avoids the problem of residual liquid leaking out and contaminating gloves and work surfaces during the removal and replacement process, especially when there is residual liquid inside the pipette tip 102. This reduces unnecessary trouble during continuous testing operations. The liquid supply connector 401 is used to connect to an external cleaning fluid supply device. Under normal use, both the solenoid three-way valves A405 and B410 are in the fully closed state. After the pipette tip 102 is removed from the slot 301, the solenoid three-way valve A405 is controlled to open. 05. Open the corresponding pipeline to allow the cleaning fluid to flow from the inlet pipe 402 or the cleaning fluid distribution pipe 403, and finally spray it into the slot 301 from the nozzle 404 to clean the clamping components inside the slot 301. After cleaning, the electromagnetic three-way valve B410 opens the corresponding pipeline, and the fan 406 and the heating wire 408 are powered on. The airflow blown in by the fan 406 is heated by the heating wire 408 and discharged through the air duct 407. Then, it is delivered to the slot 301 in the corresponding position through the air duct 407 or the airflow distribution pipe 409 to achieve rapid drying of the clamping components inside the slot 301, which is convenient for subsequent operations.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A pipette for food testing, comprising a pipette (1), characterized in that, It also includes a mounting base (2) and a head-changing mechanism (3). The pipette (1) is equipped with a suction tube (101) at its end, and a suction tip (102) is detachably connected to the outer periphery of the suction tube (101). The mounting base (2) is equipped with a head-changing mechanism (3). The head-changing mechanism (3) includes a slot (301), a horizontal groove (302), a fixed clamping ring (303), a pull rod (304), an end ring (305), a spring (306), and a movable clamping ring (307). The mounting base (2) has a slot (301) vertically opened at one end, and the mounting base (2) has a slot (301) vertically opened at one end. A horizontal groove (302) communicating with the interior of the slot (301) is provided in the horizontal direction. A fixed clamping ring (303) is fixedly connected to the end of the inner wall of the slot (301) away from the horizontal groove (302). A pull rod (304) is inserted into the horizontal groove (302) and a movable clamping ring (307) corresponding to the position of the fixed clamping ring (303) is glued to the end of the pull rod (304). An end ring (305) located inside the horizontal groove (302) is fixedly connected to the outer periphery of the pull rod (304), and a spring (306) is installed between the end of the inner wall of the horizontal groove (302) and the end ring (305).

2. The pipette for food testing according to claim 1, characterized in that: It also includes a cleaning mechanism (4), which is installed inside the mounting base (2). The cleaning mechanism (4) includes a liquid supply connector (401), a liquid inlet pipe (402), a cleaning liquid distribution pipe (403), a nozzle (404), a fan (406), an air duct (407), a heating wire (408), and an airflow duct. The liquid inlet pipe (402) is embedded inside the mounting base (2), and the liquid inlet end of the liquid inlet pipe (402) is screwed to a liquid supply connector (401) located outside the mounting base (2). The liquid inlet pipe (402) is connected to a cleaning liquid distribution pipe (403) installed at its outlet. The cleaning fluid distribution pipe (403) and the inlet pipe (402) are both equipped with nozzles (404) located on the inner wall of the slot (301). The mounting base (2) has a fan (406) embedded in the end away from the liquid supply connector (401), and the exhaust end of the fan (406) is provided with a duct (407). The duct (407) is equipped with a heating wire (408) near the end of the fan (406). The end of the duct (407) is detachably connected to an airflow distribution pipe (409). The ends of the airflow distribution pipe (409) and the duct (407) both extend into the slot (301).

3. A pipette for food testing according to claim 1, characterized in that: The fixed clamping ring (303) and the movable clamping ring (307) each have an arc-shaped groove (308) on opposite sides of their surfaces, and the mounting base (2) has an insertion cavity (309) on the top side away from the slot (301).

4. A pipette for food testing according to claim 1, characterized in that: The mounting base (2) has a discharge groove (310) welded to the side of the slot (301) that is connected to the inside of the slot (301).

5. A pipette for food testing according to claim 2, characterized in that: An electromagnetic three-way valve A (405) is installed at the connection between the liquid inlet pipe (402) and the end of the cleaning liquid diversion pipe (403), and an electromagnetic three-way valve B (410) is installed at the connection between the air duct (407) and the airflow diversion pipe (409).

6. A pipette for food testing according to claim 5, characterized in that: A controller (411) is embedded in one side of the surface of the mounting base (2). The control terminal of the controller (411) is connected to the control terminals of the fan (406), the heating wire (408), the electromagnetic three-way valve A (405), and the electromagnetic three-way valve B (410), respectively.

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