Cam assembly and hook lifting mechanism

Abstract

The utility model provides a cam assembly which comprises a cam arm provided with a fixing hole connected with a driving assembly. The rotating shaft is fixed at one end of the cam arm; the pulley is movably connected with the rotating shaft, and the pulley can rotate around the rotating shaft; the end, provided with the rotating shaft, of the cam arm is cut into a concave face, and the concave face makes contact with a limiting piece so that the cam arm can stop rotating. According to the scheme, the state before power failure can be continuously kept in an emergency, and the working stability of the equipment is improved.

Description

Technical Field

[0001] The present application relates to the field of medical detection equipment, and in particular to a cam assembly and a hook lifting mechanism. Background Art

[0002] The chemiluminescent immunoassay analyzer is a medical testing instrument that performs immunoassay on the human body by testing the patient's serum. It mainly includes a sample library, a tube library unit, a cleaning unit, a detection unit, and an incubation unit. The chemiluminescent immunoassay analyzer is fully automated and can achieve efficient and accurate detection of samples. Compared with traditional manual operations, it greatly improves detection efficiency and reduces the possibility of human errors. Therefore, it has been widely used in clinical diagnosis and scientific research.

[0003] The chemiluminescent immunoassay analyzer uses a hook lifting mechanism to realize the transfer function of the sample rack between the dispatching track and the sample library. However, when the hook in the hook lifting mechanism is driven by an electromagnet to lift, there will be problems such as the hook lifting speed is too fast, the state cannot be maintained after power failure, and the power cannot be powered for a long time. In addition, when the motor is used to drive the gear rack to drive the hook to lift, the problem of maintaining the state during power failure still cannot be solved. Utility Model Content

[0004] In response to the technical problems existing in the prior art, the present application proposes a cam assembly, comprising: a cam arm, provided with a fixing hole connected to a driving assembly; a rotating shaft, fixed at one end of the cam arm; a pulley, movably connected to the rotating shaft, and the pulley can rotate around the rotating shaft; wherein, a concave surface is cut at one end of the cam arm where the rotating shaft is installed, and the concave surface contacts a limit member to stop the cam arm from rotating.

[0005] In the cam assembly as described above, the pulley is a bearing, and the inner ring of the bearing is fixedly connected to the rotating shaft.

[0006] The cam assembly as described above further comprises: a first blocking portion and a second blocking portion, both of which are arranged on an end of the cam arm away from the rotating shaft, and the first blocking portion and the second blocking portion are sheet-like structures.

[0007] According to another aspect of the present application, a hook lifting mechanism is provided, comprising: a lifting body; a driving assembly fixed on the lifting body;

[0008] As described above, the cam assembly, the cam arm is fixed to the driving assembly through the fixing hole, and the driving assembly drives the cam arm to rotate and swing back and forth within a preset angle; the hook assembly is arranged on the lifting body, and the outer peripheral surface of the pulley is pressed and contacted with the bottom of the hook assembly, so that the hook assembly moves up and down along the lifting body when the cam arm rotates and swings back and forth.

[0009] In the hook lifting mechanism as described above, the limit member is arranged on the lifting body, and the limit member protrudes from the rotation plane of the cam arm. When the concave surface abuts against the limit member, the cam arm stops rotating.

[0010] The hook lifting mechanism as described above further comprises: an elastic component, which is arranged between the hook component and the lifting body, and when the hook component descends, the elastic component applies downward pressure to the hook component.

[0011] As described above, the hook lifting mechanism, the sensor assembly further comprises: a first sensor fixed on the lifting body, when the hook assembly is in a descending state, the first blocking portion is located in the first sensor.

[0012] As described above, the hook lifting mechanism, the sensor assembly further comprises: a second sensor fixed on the lifting body, when the hook assembly is in the raised state, the second blocking portion is located in the second sensor.

[0013] The hook lifting mechanism as described above further includes a guiding mechanism, which further includes vertical guide rails and slideways respectively arranged on the lifting body and the hook assembly, and the shapes and positions of the slideways and the guide rails are adapted to each other, so that the lifting body reciprocates in the vertical direction.

[0014] As described above, the hook lifting mechanism, the hook assembly comprises: a hook, and the hook is a U-shaped hook.

[0015] This application designs a new type of cam assembly, which drives the hook assembly to move in the vertical direction by utilizing the fluctuation of the edge height during the rotation of the cam. Compared with the method of driving the hook to rise and fall by the gear rack, the solution of this application can continue to maintain the state before the power failure in the event of an emergency, thereby improving the working stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Below, the preferred embodiments of the present application will be further described in detail with reference to the accompanying drawings, wherein:

[0017] Figure 1 is a schematic structural diagram of a sample rack scheduling device according to an embodiment of the present application;

[0018] Figure 2 yes Figure 1 The enlarged structural diagram of part A in the middle;

[0019] Figure 3 This is a schematic diagram of the structure of the hook lifting mechanism in a raised state according to an embodiment of the present application;

[0020] Figure 4 This is a schematic diagram of the structure of the hook lifting mechanism in a descending state according to an embodiment of the present application;

[0021] Figure 5 is a structural schematic diagram of a cam assembly according to an embodiment of the present application; and

[0022] Figure 6 It is a schematic diagram of the structure of a chemiluminescent immunoassay analyzer according to an embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] In the following detailed description, reference may be made to the various specification drawings that are part of the present application and are used to illustrate specific embodiments of the present application. In the accompanying drawings, similar reference numerals describe substantially similar components in different figures. The various specific embodiments of the present application are described below in sufficient detail so that a person of ordinary skill in the art with relevant knowledge and skills in the art can implement the technical solutions of the present application. It should be understood that other embodiments may also be used or structural, logical or electrical changes may be made to the embodiments of the present application.

[0025] Figure 1 It is a schematic diagram of the structure of a sample rack scheduling device according to an embodiment of the present application. Figure 2 yes Figure 1 The enlarged structural diagram of part A is shown in the figure. Figure 1 and Figure 2As shown, the sample rack scheduling device 50 includes: a scheduling body 510, a scheduling track 520, a positioning mechanism 530, a temporary storage mechanism 540 and a hook lifting mechanism 550. The scheduling body 510 is set on one side of the chemiluminescent immunoassay analyzer, and the scheduling track 520 is fixed on the scheduling body 510. A conveyor belt is set at the bottom of the scheduling track 520, and the conveyor belt is used to transport the sample rack 521 on the scheduling track. The scheduling track 520 includes one or more conveying tracks 523 and a recovery track 522, and the conveying track 523 and the recovery track 522 are arranged in parallel. The conveying track 523 is used to convey the sample rack containing the sample to be detected from the sample library to the designated position, so that the chemiluminescent immunoassay analyzer can obtain the sample to be detected on the sample rack. The recovery track 522 is used to recycle the sample rack after the detection to the designated position, and the conveying direction of the conveying track 523 and the recovery track 522 can be opposite.

[0026] The positioning mechanism 530 is disposed at one end of the scheduling track 520 and is used to locate the transport position of the sample rack. Furthermore, the positioning mechanism 530 is located at the end of the recovery track 522. When the conveyor belt on the recovery track 522 uses friction to transport the sample rack 521 to the end of the recovery track 522, the positioning mechanism 530 prevents the sample rack 521 from moving forward and temporarily stops the sample rack 521 at a preset position to achieve accurate positioning of the sample rack while the conveyor belt continues to work.

[0027] The temporary storage mechanism 540 is disposed at one end of the scheduling track 520 and is used to temporarily store the sample racks in the scheduling track 520 and / or the sample library. Figure 2 , the temporary storage mechanism 540 can move forward and backward (vertically to the paper) to switch different tracks. The hook lifting mechanism 550 is arranged at the bottom of the temporary storage mechanism 540, and is used to move the sample rack 521 between the scheduling track 520, the sample library and the temporary storage mechanism 540. Taking the sample rack 521 from the recovery track 522 to the temporary storage mechanism 540 as an example, the transmission belt on the recovery track 522 conveys the sample rack 521 to move to the right. When the sample rack 521 is conveyed to the end of the recovery track 522, the positioning mechanism 530 prevents the sample rack 521 from moving. Then, the hook lifting mechanism 550 is moved to the bottom of the sample rack 521, the hook on the hook lifting mechanism 550 cooperates with the opening of the sample rack, the positioning mechanism 530 is reset, and the sample rack 521 is allowed to continue to move. The hook lifting mechanism 550 moves the sample rack 521 to the temporary storage mechanism 540. Finally, through the movement of the temporary storage mechanism 540, the sample rack 521 is moved to the specified position.

[0028] If an electromagnet is used to drive the hook to rise and fall, the inertia force of the hook when it is lifted will be too large because the electromagnet is lifted too fast, which may damage other parts of the hook lifting mechanism or affect safety. Since the electromagnet generates too much heat after being powered on for a long time, its performance will be degraded or even damaged, so it cannot be powered on for a long time. In addition, when the electromagnet is powered off, the hook will be in a lowered state due to gravity after power failure due to the inability to continuously output supporting force, which will affect the normal operation of the sample rack scheduling device. In order to solve the above problems, the present application has redesigned the hook lifting mechanism, which is not only simple in structure and has a power-off retention function, but also can detect the lifting state of the hook lifting mechanism after powering on.

[0029] Figure 3 It is a schematic structural diagram of the hook lifting mechanism in the raised state according to an embodiment of the present application. Figure 4 1 is a schematic diagram of the structure of the hook lifting mechanism in the descending state according to an embodiment of the present application. Figure 3 and Figure 4 As shown, the hook lifting mechanism 550 includes: a lifting body 551, a driving assembly 552, a cam assembly 553 and a hook assembly 554. The lifting body 551 can be set at the bottom of the temporary storage mechanism, and the hook lifting mechanism 550 can be moved left and right in the temporary storage mechanism to transport the sample rack. The driving assembly 552 is fixed to the lifting body, and the driving assembly 552 is fixed to the center position of the cam assembly by a rotating shaft so that the cam assembly 553 can reciprocate and swing within a preset angle.

[0030] The cam assembly 553 includes a cam arm 5531 and a pulley 5532 and a rotating shaft 5533 disposed on the cam arm 5531. The rotating shaft 5533 is a supporting shaft of the pulley 5532. The pulley 5532 is fixed to the cam arm 5531 by the rotating shaft 5533. The pulley 5532 can be a circular wheel fixed to the cam arm 5531 and can rotate around the rotating shaft 5533. In one embodiment, the pulley 5532 is a bearing, and the inner ring of the bearing is fixedly connected to the rotating shaft 5533. The bearing is used to convert the rotational motion into the linear up and down motion of the hook assembly 554, thereby improving the motion stability of the hook assembly 554.

[0031] The hook assembly 554 is movably arranged on the lifting body 551, and the outer peripheral surface of the pulley 5532 is pressed against the bottom of the hook assembly 554, so that the hook assembly 554 moves up and down along the lifting body 551 when the cam arm 5531 reciprocates and swings. Figure 3The bottom of the hook assembly 554 is a flat plate-like structure, which provides good conditions for the rotation of the pulley 5532. In one embodiment, the hook assembly 554 includes: a hook 5541, which is a U-shaped hook. The U-shaped hook, that is, the hook 5541, is provided with a connecting portion on both sides. The connecting portions on the left and right sides can be matched with the openings at the front and rear ends of the sample rack to achieve the longest distance transmission function of the sample rack. Because the track transportation set by the hook lifting mechanism is limited, the design of multiple connecting portions and openings at the front and rear of the sample rack solves the problem of short sample rack transportation distance caused by limited track transportation. In addition, it is beneficial to save the length of the track, reduce the occupied space of the sample rack scheduling device and save manufacturing costs.

[0032] The hook assembly 554 works in conjunction with the cam assembly 553 to form a mechanism for controlling the vertical movement of the hook assembly 554 on the lifting body 551. Specifically, the drive assembly 552 drives the cam arm 5531 to reciprocate and rotate and swing around its axis, and the pulley 5532 is fixed to one end of the cam arm 5531 and can rotate around the rotating shaft 5533. When the cam arm 5531 swings, the pulley 5532 also rotates. The pulley 5532 contacts the bottom of the lifting body 551, and as the cam arm 5531 rotates and swings, the outer edge of the pulley 5532 pushes the hook assembly 554 to move up and down along the guide rail of the lifting body 551. Through the cooperation of the drive assembly 552, the cam assembly 553 and the hook assembly 554, the precise up and down movement of the hook assembly 554 can be achieved, which is very suitable for the use scenario that requires reciprocating motion in the vertical direction. Through reasonable design and precise manufacturing, it can be ensured that the mechanism can operate smoothly and reliably under various working conditions.

[0033] According to an embodiment of the present application, the driving assembly 552 drives the cam arm 5531 to rotate along the first direction until the cam arm 5531 abuts against the stopper 5512 of the lifting body, so that the pulley 5532 lifts the hook assembly 554. The stopper 5512 protrudes from the rotation plane of the cam arm 5531, and the stopper 5512 can be a ridge. The ridge is used to prevent the cam arm 5531 from continuing to rotate. When the cam arm 5531 abuts against the ridge, the preset angle of rotation of the cam arm 5531 is an obtuse angle. When the rotation angle of the cam arm 5531 is an obtuse angle, the cam assembly 553 has a total of three force points, namely, the force point at the bottom of the pulley 5532 and the hook assembly 554, the force point at the fixed connection between the cam arm 5531 and the driving assembly 552, and the force point at which the cam arm 5531 contacts the ridge. The three force points form a stable force triangle. Even when the driving assembly 552 is powered off and no longer applies driving force, the cam arm 5531 will still support the hook assembly 554 in a raised state, thereby realizing the power-off retention function.

[0034] refer to Figure 4The driving assembly 552 drives the cam arm 5531 to rotate along the second direction until the height of the highest point of the pulley is less than or equal to the height of the bottom of the hook assembly 554, and then stops rotating, so that the hook assembly is in a descending state. The first direction may be a counterclockwise direction, and the second direction may be a clockwise direction.

[0035] like Figure 4 As shown, the hook lifting mechanism 550 also includes: an elastic component 555, which is arranged between the hook component 554 and the lifting body 551. When the hook component 554 descends, the elastic component 555 applies downward pressure to the hook component 554. Among them, the elastic component 555 can be a compression spring. When the hook component 554 rises, the spring is compressed and stores energy. When the hook component 554 descends, the stored energy is released to help accelerate the rapid return of the hook component, avoiding the uncertainty of the hook component 554 falling back only by gravity. In addition, since part of the energy during the descent is provided by the spring, the power required by the drive component 552 during the descent can be reduced, thereby reducing energy consumption.

[0036] According to one embodiment of the present application, the hook lifting mechanism 550 also includes: a control unit (not shown) and a sensor assembly 556, the control unit is electrically connected to the driving assembly 552 and the sensor assembly 556 respectively, the sensor assembly is used to send a monitoring signal to the control unit, and the control unit sends a control signal to the driving assembly 552 to drive the cam arm 5531 to rotate and swing back and forth.

[0037] The control unit can include one or more central processing units (CPUs), graphics processing units (GPUs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or combinations thereof. The control unit can execute software or computer readable instructions stored in a memory to perform the methods or operations described herein. The control unit can be implemented in several different ways. For example, the control unit can include one or more embedded processors, processor cores, microprocessors, logic circuits, hardware finite state machines (FSMs), digital signal processors (DSPs), or combinations thereof.

[0038] According to one embodiment of the present application, the hook lifting mechanism 550 further includes: a guide mechanism 557, which includes a vertical guide rail 5571 and a slideway (not shown) respectively arranged on the lifting body 551 and the hook assembly 554, and the shape and position of the slideway and the guide rail 5571 are adapted to each other, so that the lifting body 551 reciprocates in the vertical direction. The guide rail 5571 and the slideway cooperate with each other to provide a precise linear motion path for the lifting body 551. By limiting the direction of movement, it is ensured that the lifting body 551 can only move along a specific path, thereby achieving precise positioning and directional movement.

[0039] Figure 5 is a schematic diagram of the structure of a cam assembly according to an embodiment of the present application. Figure 4 and Figure 5 As shown, the sensor assembly 556 includes: a first sensor 5561 fixed on the lifting body 551, and when the hook assembly 554 is in a descending state, the first blocking portion 5534 of the cam assembly is located in the first sensor 5561. The sensor assembly 556 further includes: a second sensor 5562 fixed on the lifting body 551, and when the hook assembly 554 is in a raised state, the second blocking portion 5535 of the cam assembly is located in the second sensor 5562. The first blocking portion 5534 and the second blocking portion 5535 are both arranged on the cam arm 5531 and away from one end of the rotating shaft 5533, and the first blocking portion 5534 and the second blocking portion 5535 are sheet-like structures.

[0040] According to one embodiment of the present application, the first sensor 5561 and / or the second sensor 5562 is an optical coupling sensor, which uses light to detect the first blocking portion 5534 or the second blocking portion 5535. The optical coupling sensor includes a light emitting end and a receiving end. When the first blocking portion 5534 or the second blocking portion 5535 is located between the light emitting end and the receiving end, it will affect the receiving end from receiving the light. The position information of the cam arm 5531 is determined based on whether the receiving end receives the light, and then the state of the hook assembly is determined. The control unit can adjust the swing direction of the cam arm 5531 in real time according to the position signal sent by the sensor assembly 556, thereby achieving precise position control and motion control.

[0041] refer to Figure 5 , a concave surface 5536 is cut at one end of the cam arm 5531 where the rotating shaft 5533 is installed, and the concave surface 5536 contacts the stopper to stop the cam arm from rotating. While the concave surface contacts the stopper to limit the cam arm from continuing to rotate, the rotating shaft 5533 may be allowed to reach a larger rotation angle, thereby increasing the range of motion of the entire cam arm. The contact between the concave surface 5536 and the stopper can provide a larger contact area than other forms of contact (such as point contact or edge contact), which can increase the stability of the contact, reduce wear, and improve the reliability and service life of the cam assembly 553.

[0042] Figure 6 Schematic diagram of the structure of a chemiluminescent immunoassay analyzer according to an embodiment of the present application. Figure 6As shown, the chemiluminescent immunoassay analyzer 1000 at least includes: a sample library 100, a tube library unit 200, an incubation unit 300, a cleaning unit 400, a detection unit 500, a reagent unit 600, a plurality of grippers 700 and a sample rack scheduling device 50. The sample rack scheduling device 50 is arranged between the sample library 100 and other units, and the hook lifting mechanism in the sample rack scheduling device 50 can realize the operation function of the sample rack between the scheduling track and the sample library.

[0043] In summary, the present application designs a new type of cam assembly, which drives the hook assembly to move in the vertical direction by utilizing the fluctuation of the edge height during the rotation of the cam. Compared with the method of driving the hook to rise and fall by the gear rack, the solution of the present application can continue to maintain the state before the power failure in the event of an emergency, thereby improving the working stability of the equipment.

[0044] The above embodiments are only used to illustrate the present application, and are not intended to limit the present application. Ordinary technicians in the relevant technical field may make various changes and modifications without departing from the scope of the present application. Therefore, all equivalent technical solutions should also fall within the scope disclosed in the present application.

Claims

1. A cam assembly, characterized in that: include: A cam arm, provided with a fixing hole connected to the drive assembly; A rotating shaft fixed to one end of the cam arm; A pulley is movably connected to the rotating shaft, and the pulley can rotate around the rotating shaft; Wherein, one end of the cam arm on which the rotating shaft is mounted is cut into a concave surface, and the concave surface contacts a limiting member to stop the cam arm from rotating.

2. The cam assembly according to claim 1, characterized in that: The pulley is a bearing, and the inner ring of the bearing is fixedly connected to the rotating shaft.

3. The cam assembly according to claim 1, characterized in that: Further including: The first blocking portion and the second blocking portion are both arranged on one end of the cam arm away from the rotating shaft, and the first blocking portion and the second blocking portion are sheet-like structures.

4. A hook lifting mechanism, characterized in that: include: Lifting the main body; A driving assembly, fixed on the lifting body; The cam assembly according to any one of claims 1 to 3, wherein the cam arm is fixed to the driving assembly through the fixing hole, and the driving assembly drives the cam arm to rotate and swing back and forth within a preset angle; The hook assembly is arranged on the lifting body, and the outer peripheral surface of the pulley is pressed and contacted with the bottom of the hook assembly, so that the hook assembly moves up and down along the lifting body when the cam arm reciprocates and swings.

5. The hook lifting mechanism according to claim 4, characterized in that: The limiting member is arranged on the lifting body, and the limiting member protrudes from the rotation plane of the cam arm. When the concave surface abuts against the limiting member, the cam arm stops rotating.

6. The hook lifting mechanism according to claim 4, characterized in that: Further including: The elastic component is arranged between the hook component and the lifting body. When the hook component descends, the elastic component applies downward pressure to the hook component.

7. The hook lifting mechanism according to claim 4, characterized in that: It further includes a sensor assembly, which includes: a first sensor fixed on the lifting body, and when the hook assembly is in a descending state, the first blocking part is located in the first sensor.

8. The hook lifting mechanism according to claim 4, characterized in that: It further includes a sensor assembly, which includes: a second sensor fixed on the lifting body, and when the hook assembly is in a raised state, the second blocking part is located in the second sensor.

9. The hook lifting mechanism according to claim 4, characterized in that: It further includes a guiding mechanism, which further includes a vertical guide rail and a slideway respectively arranged on the lifting body and the hook assembly, and the shapes and positions of the slideway and the guide rail are adapted to each other, so that the lifting body reciprocates in the vertical direction.

10. The hook lifting mechanism according to claim 4, characterized in that: The hook assembly comprises a hook, and the hook is a U-shaped hook.

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