A dual position sample introduction apparatus

Abstract

This utility model relates to the field of chemical processing technology, specifically to a dual-station sample injection device, including a mounting base and two injectors. Each injector includes an injector body and a turntable rotatably mounted on the mounting base. The injector body is mounted on the mounting base and has a syringe capable of reciprocating vertically. The mounting base has an injection hole adapted to the syringe. Two servo motors are installed within the mounting base, and the rotation shafts of both servo motors are connected to the rotation centers of the two turntables via the same synchronous belt. Each rotation shaft of the servo motors is equipped with a clutch. A switching mechanism is provided on the mounting base to control the on / off state of the two clutches. This dual-station sample injection device can continue to operate normally even if either drive motor fails, exhibiting high reliability.

Description

Technical Field

[0001] This utility model relates to the field of chemical testing technology, specifically to a dual-station sample injection device. Background Technology

[0002] In chemical production processes, automated gas chromatographs (GCs) are needed for qualitative and quantitative analysis of complex mixtures containing multiple components. This allows producers to perform qualitative and quantitative analysis of the produced chemicals, ensuring product quality. Currently, automated gas chromatographs typically include an injector and a sampler. The sampler supplies sample vials to the injector, which injects the sample through an inlet located on the upper surface of the GC. Conventional automated gas chromatographs generally have one sampler and one injector, which, while simple in structure, results in low overall injection and testing efficiency (e.g., patent CN202222524773.2 – a gas chromatography-mass spectrometry instrument with a sealed injection port). Therefore, some manufacturers have designed dual-station injectors, allowing for double the injection volume with a single sample, thus doubling the injection efficiency.

[0003] For example, patent CN202111374292.1, "Gas Chromatography Analysis System," designs two injectors and one sampler, achieving high injection efficiency. However, this design does not disclose the specific drive structure of the two circular discs. In actual design, the two injectors typically operate independently, each injector body equipped with its own independently rotating circular disc. Currently, each circular disc is driven by an independent drive motor. Because the entire circular disc needs to continuously rotate at a certain angle and then stop, the system experiences frequent starts and stops, making the drive motors prone to failure. When any drive motor fails, the corresponding circular disc stops working, causing the corresponding injector to stop working. This also forces the entire sampler, which is compatible with both injectors, to stop working until repairs are completed, thus affecting the normal operation of the entire automated gas chromatograph. Of course, in order to save on equipment and control costs, some manufacturers will design only one drive motor and drive two circular turntables to rotate synchronously via a synchronous belt. When the drive motor fails, both circular turntables must stop working and wait for repair, which greatly affects the qualitative and quantitative analysis of the entire batch of products. Therefore, neither of the above two drive methods is reliable. Utility Model Content

[0004] In order to overcome one of the shortcomings of the prior art, the purpose of this utility model is to provide a dual-station sample injection device. This dual-station sample injection device can still work normally even if either drive motor is damaged, and has high reliability.

[0005] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0006] A dual-station sample injection device includes a mounting base and two injectors. Each injector includes an injector body and a turntable rotatably mounted on the mounting base. The injector body is mounted on the mounting base and has a syringe capable of reciprocating vertically. The mounting base has an injection hole adapted to the syringe. Two servo motors are installed inside the mounting base. The rotation shafts of the two servo motors are connected to the rotation centers of the two turntables via the same synchronous belt. Each rotation shaft of the two servo motors is equipped with a clutch. The mounting base has a switching mechanism for controlling the on / off state of the two clutches.

[0007] Furthermore, the switching mechanism includes a mounting base, a lever rotatably mounted on the mounting base, and a swing lever disposed on the lever. The mounting base is mounted on the mounting base, and both ends of the lever are hinged to the operating ends of the two clutches. The swing lever can drive the lever to swing to control the engagement of one clutch and the disengagement of the other clutch. The swing lever can self-lock relative to the mounting base.

[0008] Furthermore, the swing lever is provided with a limiting protrusion, and the mounting base is provided with limiting grooves that cooperate with the limiting protrusion at both ends of the lever swing direction.

[0009] Furthermore, the lever is mounted on the mounting base via a pivot, and a top-compression spring is fitted on the pivot. One end of the top-compression spring abuts against the side of the lever, and the other end abuts against the side wall of the mounting base. The top-compression spring can press the lever and the swing lever against the corresponding side wall of the mounting base, so as to realize that the limiting protrusion is locked in the limiting groove.

[0010] Furthermore, the mounting base is disposed on the area between the two clutches of the mounting base.

[0011] Furthermore, the switching mechanism includes a lever rotatably mounted on a mounting base, both ends of which are hinged to the operating ends of the two clutches. A telescopic device is hinged to the mounting base, the telescopic end of which is hinged to one end of the lever. A control switch is provided on the mounting base and is electrically connected to the telescopic device.

[0012] Furthermore, the mounting base includes a base body and a cover. The injector body and the turntable are both mounted on the base body. The base body has an open mounting cavity. The cover is detachably mounted on the opening of the mounting cavity. The two servo motors and the synchronous belt are both located inside the mounting cavity. The injection hole is provided through the base body.

[0013] Furthermore, the mounting base is provided with at least one roller, all of which abut against the back of the timing belt to change the direction of the timing belt and avoid the injection hole.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This utility model discloses a dual-station sample injection device that improves upon existing sample injection equipment by modifying the transmission structure. It employs two drive motors simultaneously driving the same synchronous belt, which in turn drives the rotation of two turntables. Each drive motor is equipped with a clutch to engage and disengage the drive motor, allowing for selective driving of the synchronous belt by either motor. This design ensures that a failure in either drive motor will not disrupt the normal operation of the entire sample injection device and facilitates efficient maintenance scheduling without interrupting operation. A switching mechanism is also included to control the engagement and disengagement of the two clutches, simplifying operation. This dual-station sample injection device features a simple structure, is easy to modify, does not affect the normal operation or structural layout of existing sample injection equipment, and offers high reliability.

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 2 ;

[0019] Figure 3 This is a schematic diagram of the switching mechanism in an embodiment of the present invention;

[0020] Figure 4 yes Figure 3 A magnified view of a section at point A in the middle;

[0021] Figure 5 This is a partial structural schematic diagram of another embodiment of the present invention.

[0022] Explanation of icon numbers:

[0023] Mounting base 10, injection hole 11, servo motor 12, synchronous belt 13, rotating shaft 14, clutch 15, seat body 16, cover 17, mounting cavity 18, winding wheel 19;

[0024] Injector 20, injector body 21, rotary table 22, syringe 23;

[0025] Switching mechanism 30, mounting base 31, lever 32, swing lever 33, limiting protrusion 34, limiting groove 35, rotating shaft 36, top pressure spring 37, telescopic device 38, control switch 39. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0027] Reference Figures 1 to 5 The illustrated dual-station injection device includes a mounting base 10 and two injectors 20. Each injector 20 includes an injector body 21 and a turntable 22 rotatably mounted on the mounting base 10. The injector body 21 is mounted on the mounting base 10 and has a syringe 23 that can reciprocate vertically. The mounting base 10 has an injection hole 11 that is adapted to the syringe 23. Two servo motors 12 are installed inside the mounting base 10. The rotation shafts 14 of the two servo motors 12 are connected to the rotation centers of the two turntables 22 via the same synchronous belt 13. Each rotation shaft 14 of the two servo motors 12 is equipped with a clutch 15. The mounting base 10 is equipped with a switching mechanism 30, which controls the on / off state of the two clutches 15.

[0028] Wherein, clutch 15 can be a conventional clutch, such as the structure in CN115405638A - a wear-resistant clutch. In this application, the actuating end of the switching mechanism 30 can drive the transmission rod of the patent. Of course, in some embodiments, the structure in patent CN113653743A - a clutch with shock absorption function can also be used. This application prefers this technical solution. In this solution, the switching mechanism 30 of this application acts directly on the pushing assembly. The switching mechanism 30 presses the diaphragm spring, the pressure cover and the clutch plate through the pushing assembly, and finally acts on the flywheel, thus driving the output shaft to rotate. At this time, the output shaft is connected to drive the synchronous belt 13 in this application, and the flywheel is connected to the servo motor 12. In this application, the switching mechanism 30 is used to control the selective engagement and disengagement of one of the two clutches 15. Specifically, when either servo motor 12 fails, the switching mechanism 30 can control the corresponding clutch 15 to achieve power disengagement. That is, the switching mechanism 30 removes the pressing force on the pushing assembly, causing the clutch disc and flywheel to separate, and the output shaft within the clutch 15 loses its active driving force on the synchronous belt 13. Because the switching mechanism 30 ensures that the failed servo motor 12 stops outputting force to the synchronous belt 13, it also allows the other servo motor 12 to connect and drive the synchronous belt 13 to rotate. The synchronous belt 13 can no longer apply a reaction force to the failed servo motor 12 and drive it to rotate.

[0029] This dual-station sample injection device improves upon existing sample injection equipment by redesigning the transmission structure. It employs two drive motors simultaneously driving the same synchronous belt 13, which in turn drives the rotation of two turntables 22. Each drive motor is equipped with a clutch 15, used to switch the drive motor's transmission on and off, allowing one motor to selectively drive the synchronous belt 13. This design ensures that a failure in either drive motor will not disrupt the normal operation of the entire sample injection device, and facilitates the efficient scheduling of maintenance tasks without interrupting operation. A switching mechanism is also included to control the on / off state of the two clutches 15, simplifying operation. This dual-station sample injection device features a simple structure, is easy to modify, does not affect the normal operation or structural layout of existing sample injection equipment, and offers high reliability.

[0030] See Figures 1 to 3In one embodiment of this application, in order to enable one of the two clutches 15 to be engaged and the other to be disengaged, the switching mechanism 30 includes a mounting base 31, a lever 32 rotatably mounted on the mounting base 31, and a swing lever 33 disposed on the lever 32. The mounting base 31 is mounted on the mounting base 10. Both ends of the lever 32 are hinged to the operating ends of the two clutches 15. The swing lever 33 can drive the lever 32 to swing to control the engagement of one clutch 15 and the disengagement of the other clutch 15. The swing lever 33 can self-lock relative to the mounting base 31.

[0031] In the above embodiment, in order to enable the simultaneous driving of two clutches 15 to perform corresponding actions, the mounting base 31 is disposed on the mounting base 10 in the area between the two clutches 15. This structural design facilitates the arrangement of the lever 32. In fact, in this embodiment, the mounting base 31 has a slot, the lever 32 is hinged to the bottom of the mounting base 31, and the swing lever 33 moves through the slot.

[0032] See Figure 3 and Figure 4 In the above embodiments, a manual driving method is adopted. The swing lever 33 is actually a lever arm used to control the swing direction of the lever 32, thereby driving the clutch 15 at the corresponding end to perform corresponding actions. The outward end of the swing lever 33 can be understood as a conventional control lever; the operator only needs to push the swing lever 33 to swing around its rotation center. It should be noted that in this application, the rotation center of the swing lever 33 and the lever 32 are collinear, which makes it easier for the swing lever 33 to push the lever 32 to swing around its own rotation center. In the actual design process, the lever 32 is mounted on the mounting base 31 via a rotating shaft 36. The rotating shaft 36 is perpendicular to the swing lever 33, and the swing lever 33 is located in the area where the lever 32 and the rotating shaft 36 are connected.

[0033] See Figure 4 In the above embodiments, to better achieve locking of the swing lever 33 relative to the mounting base 31, a slot can be formed at both ends of the mounting base 31, allowing the swing lever 33 to engage with the slot. Alternatively, in some embodiments, the swing lever 33 is provided with a limiting protrusion 34, and the mounting base 31 has limiting grooves 35 at both ends in the swing direction of the lever 32 that cooperate with the limiting protrusions 34. The limiting grooves 35 and the limiting protrusions 34 can cooperate with each other. In this case, it is necessary to ensure that under normal circumstances, the limiting protrusions 34 will not slide out of the limiting grooves 35, thus preventing the swing lever 33 from slipping relative to the mounting base 31.

[0034] In order for the swing lever 33 to press against the mounting base 31 so that the limiting groove 35 and the limiting protrusion 34 are locked relative to each other, the lever 32 is mounted on the mounting base 31 via a rotating shaft 36. A top pressure spring 37 is fitted on the rotating shaft 36. One end of the top pressure spring 37 abuts against the side of the lever 32, and the other end abuts against the side wall of the mounting base 31. The top pressure spring 37 can press the lever 32 and the swing lever 33 against the corresponding side wall of the mounting base 31 so that the limiting protrusion 34 is locked in the limiting groove 35.

[0035] See Figure 5 To achieve semi-automatic switching and eliminate the need for manual control of the swing lever 33, in another embodiment of this application, the switching mechanism 30 includes a lever 32 rotatably mounted on the mounting base 10. Both ends of the lever 32 are hinged to the operating ends of the two clutches 15. A telescopic device 38 is hinged to the mounting base 10, with its telescopic end hinged to one end of the lever 32. A control switch 39 is provided on the mounting base 10 and is electrically connected to the telescopic device 38. In practice, the telescopic device 38 can be a telescopic electric cylinder, and the control switch 39 controlling the telescopic device 38's extension and retraction is a conventional technique, as seen in patent CN202322427747.2 – a linear telescopic safety structure with a switch, and also in patent CN201611098432.6 – a control device for a telescopic sleeve, as well as its control system. These details are not elaborated upon here. In the above embodiments, the structure of a clutch with shock absorption function in patent CN113653743A is used as an example. By controlling the extension and retraction of the telescopic device 38 through the control switch 39, the lever 32 can be driven to swing. The lever 32 can drive the operating end on the clutch 15 to move, that is, drive the pushing component in the clutch 15 to move closer to or away from the pressure plate and the clutch disc, thereby realizing the power connection or power separation of the entire clutch 15.

[0036] See Figures 1 to 2In one embodiment of this application, for ease of installation, the mounting base 10 includes a base body 16 and a cover 17. The injector body 21 and the turntable 22 are both mounted on the base body 16. The base body 16 has an open mounting cavity 18 inside. The cover 17 is detachably mounted on the opening of the mounting cavity 18. Two servo motors 12 and a timing belt 13 are both disposed within the mounting cavity 18. The injection hole 11 is disposed through the base body 16. The opening of the mounting cavity 18 is located on the side of the base body 16, facilitating sealing by the cover 17. In fact, in this application, the mounting base 10 is directly mounted on the automatic gas chromatograph body. This design allows the injector 20 and the turntable 22 to be integrated into the same mounting structure, facilitating subsequent installation and maintenance.

[0037] In the above embodiment, since the mounting base 10 has a through injection hole 11, in order to avoid the rotating synchronous belt 13 from interfering with the injection hole 11, at least one winding wheel 19 is provided in the mounting base 10. All the winding wheels 19 abut against the back of the synchronous belt 13 to change the direction of the synchronous belt 13 and avoid the injection hole 11.

[0038] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A dual-station sample injection device, comprising a mounting base and two injectors, each injector comprising an injector body and a turntable rotatably mounted on the mounting base, the injector body being mounted on the mounting base, the injector body being provided with a syringe capable of reciprocating along a vertical direction, and the mounting base having an injection port adapted to the syringe, characterized in that, The mounting base is equipped with two servo motors. The rotating shafts of the two servo motors are connected to the rotation centers of the two turntables via the same synchronous belt. Each of the rotating shafts of the two servo motors is equipped with a clutch. The mounting base is equipped with a switching mechanism for controlling the on / off state of the two clutches.

2. The dual-station sample introduction device according to claim 1, characterized in that: The switching mechanism includes a mounting base, a lever rotatably mounted on the mounting base, and a swing lever disposed on the lever. The mounting base is mounted on the mounting base. Both ends of the lever are hinged to the operating ends of the two clutches. The swing lever can drive the lever to swing to control the engagement of one clutch and the disengagement of the other clutch. The swing lever can self-lock relative to the mounting base.

3. The dual-station sample introduction device according to claim 2, characterized in that: The swing lever is provided with a limiting protrusion, and the mounting base is provided with limiting grooves at both ends of the lever swing direction to cooperate with the limiting protrusion.

4. The dual-station sample introduction device according to claim 3, characterized in that: The lever is mounted on the mounting base via a pivot. A top-compression spring is fitted on the pivot. One end of the top-compression spring abuts against the side of the lever, and the other end abuts against the side wall of the mounting base. The top-compression spring can press the lever and the swing lever against the corresponding side wall of the mounting base, so as to make the limiting protrusion engage in the limiting groove.

5. A dual-station sample introduction device according to claim 2, characterized in that: The mounting base is disposed on the area between the two clutches of the mounting base.

6. The dual-station sample introduction device according to claim 1, characterized in that: The switching mechanism includes a lever rotatably mounted on a mounting base, both ends of which are hinged to the operating ends of the two clutches. A telescopic device is hinged to the mounting base, the telescopic end of which is hinged to one end of the lever. A control switch is provided on the mounting base and is electrically connected to the telescopic device.

7. A dual-station sample introduction device according to any one of claims 1-6, characterized in that: The mounting base includes a base body and a cover. The injector body and the turntable are both mounted on the base body. The base body has an open mounting cavity. The cover is detachably mounted on the opening of the mounting cavity. The two servo motors and the synchronous belt are both located inside the mounting cavity. The injection hole is provided through the base body.

8. A dual-station sample introduction device according to claim 1, characterized in that: The mounting base is provided with at least one roller, and all the rollers abut against the back of the timing belt to change the direction of the timing belt and avoid the injection hole.

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