Lifting mixing device

Abstract

The invention discloses a lifting blending device which comprises a driver, an output shaft of the driver is fixedly connected with a rotating shaft, the driver is provided with a guide column, the rotating shaft is sleeved with a blending device, the side wall of the blending device is provided with a spiral channel used for allowing the guide column to penetrate through, the top of the blending device is provided with a bearing device, and the bottom of the blending device is provided with a balancing weight. Wherein the driver works according to the following modes: (1) an output shaft of the driver enters a first uniform acceleration stage and is used for enabling the mixer to ascend; (2) the output shaft of the driver enters a second uniform acceleration stage and is used for enabling the mixer to rotate at the highest position; and then entering a uniform deceleration stage until the rotating speed is zero, and in the process, lowering the mixer. The device is simple in structure, small in size, convenient to control, stable in operation and low in failure rate, can be well applied to online analysis equipment, improves the space utilization rate of the whole equipment, and reduces the occupied area of the equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of online mixing, in particular to a lifting mixing device. Background Art

[0002] To obtain accurate results during biochemical immunoassays, the sample to be tested must be thoroughly mixed. Early online mixing devices used dual motors to raise and lower the mixer and mix it. This resulted in a complex structure, large footprint, and a significant disadvantage for miniaturization. Currently, online mixing devices utilize a single motor to drive the mixer's rotational rise, maintaining it at its highest position for mixing. In these structures, the mixer's rise relies on the speed difference between the motor's output shaft and the mixer. If no intervention is taken, the mixer will move at the same speed as the output shaft when it reaches its highest position, eliminating its upward force and causing it to fall, preventing mixing from completing. To achieve this mixing goal, existing single-motor lifting and mixing devices employ either a locking mechanism to prevent the mixer from falling or a magnetic mechanism to reduce the mixer's speed and maintain its upward force. The former prevents the mixer from descending after mixing is complete, while the latter is bulky, costly, and unstable, hindering overall device performance. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a lifting and mixing device with a compact size and stable operation, which can specifically adopt the following technical solutions: The lifting and mixing device of the present invention comprises a driver and a mixer, wherein the output shaft of the driver is fixedly connected to a rotating shaft, the rotating shaft is provided with a radially extending guide post, the mixer is sleeved on the rotating shaft, a spiral groove for passing the guide post is provided on the side wall of the mixer, a support is provided on the top of the mixer, and a counterweight is provided on the bottom of the mixer; The driver works in the following manner during the lifting and mixing process: In the first step, the output shaft of the driver enters the first uniform acceleration stage, which is used to make the mixer rise. During this process, the guide post moves from the top starting end of the spiral groove to the bottom ending end of the spiral groove; In the second step, the output shaft of the driver enters the second uniform acceleration stage, which is used to keep the mixer rotating at the highest position. During this process, the speed of the output shaft is always greater than the speed in the first uniform acceleration stage. In the third step, the output shaft of the driver first rotates at a uniform speed and then enters a uniform deceleration stage until the speed reaches zero. During this process, the mixer descends and the guide column reaches the top starting end of the spiral groove from the bottom end end of the spiral groove.

[0004] Preferably, the spiral channel is provided with a ridge connected to the guide post, and the width of the contact surface between the ridge and the guide post is smaller than the wall thickness of the mixer.

[0005] Preferably, the bottom terminal end of the spiral groove is arranged horizontally, and a boss is provided at the inlet of the horizontal section of the spiral groove to reduce the diameter of the groove.

[0006] Preferably, an exhaust hole is provided on the side wall of the mixer.

[0007] Preferably, a supporting groove with an upper opening structure is provided on the top of the support, and the central axis of the supporting groove is arranged parallel to the central axis of the rotating shaft.

[0008] Preferably, a drainage hole communicating with the supporting groove is provided on the side wall of the support.

[0009] Preferably, the counterweight block is a counterweight ring coaxially arranged with the mixer.

[0010] Preferably, the driver is provided with an upwardly extending fixing column.

[0011] The lifting and mixing device provided by the present invention does not require additional locking devices or magnetic mechanisms to prevent the mixer from falling. Simply by controlling the speed of the driver, the mixer can be ensured to rise steadily and rotate at a high position, even if the driver is constantly accelerating during the mixing process. When mixing is complete, the driver can simply be decelerated. The present invention has a simple structure, compact size, easy operation, stable operation, and a low failure rate. It is well-suited for use in online analytical equipment, improving the space utilization of the entire device and reducing its footprint. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention.

[0013] Figure 2 yes Figure 1 sectional view.

[0014] Figure 3 yes Figure 1 Schematic diagram of the three-dimensional structure of the mixer and support.

[0015] Figure 4 1 is a diagram showing the relationship between the rotational speed and time of the driver in the embodiment. DETAILED DESCRIPTION

[0016] The following describes an embodiment of the present invention in detail with reference to the accompanying drawings. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and a specific working process. However, the protection scope of the present invention is not limited to the following embodiment.

[0017] like Figure 1-4 As shown, the lifting and mixing device of the present invention includes a driver and a mixer.

[0018] In this embodiment, the driver is a unidirectional motor 1. Of course, a forward / reversible motor can also be used. The output shaft of the unidirectional motor 1 is fixedly connected to the rotating shaft 2 via a set screw 3, and the two rotate synchronously. A radially extending guide post 4 is also fixed to the rotating shaft 2, which is used to connect to the mixer 5.

[0019] The mixer 5 is made of wear-resistant Iglidur® J engineering plastic, which is sleeved on the rotating shaft 2. A spiral groove 6 for the guide post 4 is provided on the side wall. When the unidirectional motor 1 rotates and there is a speed difference between the rotating shaft 2 and the mixer 5, the mixer 5 will rise or fall along the rotating shaft 2, that is, the guide post 4 slides up or down along the spiral groove 6. Since the fitting clearance between the rotating shaft 2 and the mixer 5 is small, an exhaust hole 7 is provided on the side wall of the mixer 5 to ensure smooth relative movement between the rotating shaft 2 and the mixer 5. Secondly, a continuous ridge 8 connected to the guide post 4 is provided on the spiral groove 6, and the contact surface width of the ridge 8 and the guide post 4 is less than the wall thickness of the mixer 5. It is used to reduce the contact area between the guide post 4 and the spiral groove 6, reduce friction, and ensure smooth relative movement between the rotating shaft 2 and the mixer 5. The bottom end of the spiral channel 6 is horizontally positioned (i.e., a horizontal section is provided). A boss 9 is located at the entrance of this section, narrowing the channel diameter to prevent the mixer 5 from falling when it reaches its highest position. Finally, a counterweight 10 is located at the bottom of the mixer 5. This counterweight 10 is a coaxial counterweight ring positioned coaxially with the mixer 5, lowering its center of gravity and ensuring operational stability.

[0020] A support 11 is mounted on top of the mixer 5. This support 11 features an upper-opening support slot 12, with the central axis of the support slot 12 parallel to the central axis of the rotating shaft 2. This means the support slot 12 is eccentric. When the mixer 5 rotates the support 11, the sample within the eccentric support slot 12 is effectively mixed. Drain holes 13 are provided on the sidewalls of the support 11, connecting to the support slot 12. This prevents accidental sample spillage and accumulation within the support slot 12.

[0021] In addition, a fixing column 14 extending upward is installed at each of the four corners of the top of the housing of the unidirectional motor 1 for fixing the device to the online analysis equipment.

[0022] During the lifting and mixing process, the rotating shaft 2 keeps accelerating to drive the mixer 5 to rotate. The operating speed of the mixer 5 is always lower than the operating speed of the rotating shaft 2, thereby ensuring the stable operation of the mixer 5. The unidirectional motor 1 has the following three speed control stages: In the first step, the output shaft of the unidirectional motor 1 enters the first uniform acceleration stage, which is used to make the mixer 5 rise. During this process, the guide post 4 moves from the top starting end of the spiral groove 6 to the bottom ending end of the spiral groove 6; In the second step, the output shaft of the unidirectional motor 1 enters the second uniform acceleration stage, which is used to keep the mixer 5 rotating at the highest position. During this process, the speed of the output shaft of the unidirectional motor 1 is always greater than the speed in the first uniform acceleration stage. In the third step, the output shaft of the unidirectional motor 1 first rotates at a uniform speed and then enters a uniform deceleration stage until the speed reaches zero. During this process, the mixer 5 descends and the guide column 4 reaches the top starting end of the spiral groove 6 from the bottom ending end of the spiral groove 6.

[0023] The working process of the present invention is described in detail below: The first uniform acceleration stage (0-0.2 seconds): the rotating shaft 2 accelerates clockwise under the action of the unidirectional motor 1, and the mixer 5 rotates relative to the rotating shaft 2 under the action of static inertia. During the relative rotation of the mixer 5 and the rotating shaft 2, the guide column 4 on the rotating shaft 2 provides a force along the rotation direction. This force acts on the inclined surface of the spiral groove 6 of the mixer 5 and is decomposed into a force along the rotation direction and a force perpendicular to the rotation direction and upward. The force along the rotation direction causes the mixer 5 to accelerate along with the rotating shaft 2, and the force perpendicular to the rotation direction and upward causes the mixer 5 to overcome its own gravity and the gravity of the counterweight 10 and rise.

[0024] At this time, if the unidirectional motor 1 is still maintained in the first uniform acceleration state, due to the inertia of the mixer 5, the mixer 5 will collide with the guide column 4 at the moment it rises to the highest position. After the collision, the guide column 4 will break away from the horizontal section at the bottom end of the spiral groove 6 and eventually fall, resulting in a failure to lift.

[0025] Therefore, when the guide post 4 reaches the bottom end of the spiral groove 6, the unidirectional motor 1 will continue to accelerate and enter the second uniform acceleration stage.

[0026] The second uniform acceleration stage (0.2-3.7 seconds): the output shaft of the unidirectional motor 1 is Figure 4 The second section of the six-point curve shown is accelerated to overcome the collision between the mixer 5 and the guide post 4 caused by the inertia of the mixer 5. The acceleration force of the second section controlled by the six-point curve is greater than the force of the collision between the mixer 5 and the guide post 4, so that the rotating shaft 2 is continuously accelerated to drive the mixer 5 to rotate. That is, the operating speed of the mixer 5 is always lower than the operating speed of the rotating shaft 2, thereby achieving stable operation of the mixer 5.

[0027] The aforementioned unidirectional motor 1 rotates by receiving pulses. After receiving a pulse sequence, the motor 1 starts rotating. However, the pulse frequency received by the motor fluctuates, causing the motor 1 to run unevenly. During uneven operation, when the speed of the rotating shaft 2 is slower than that of the mixer 5, the mixer 5 will fall, resulting in mixing failure. In the present invention, the speed of the motor 1 is controlled according to the second segment of the six-point curve. This allows the motor 1 to overcome the speed fluctuations caused by the pulse frequency fluctuations, allowing the rotating shaft 2 to continuously accelerate and drive the mixer 5, even if the mixer 5's speed is always slower than that of the rotating shaft 2, thereby ensuring stable operation of the mixer 5.

[0028] When the mixer 5 is running stably, the guide post 4 is in the horizontal groove at the bottom of the mixer 5. At this time, the force exerted by the guide post 4 on the mixer 5 is a force along the rotation direction and a force perpendicular to the rotation direction and downward. Due to the boss 9 provided at the inlet of the horizontal section of the spiral groove 6, the guide post 4 increases the resistance to the separation of the horizontal section of the spiral groove 6, thereby further ensuring that the mixer 5 will not fall when rotating at the top.

[0029] Uniform speed buffering stage (3.7-4 seconds): When the mixing is completed, the output shaft of the unidirectional motor 1 is Figure 4 The third section of the six-point curve shown maintains a uniform rotation speed to buffer the subsequent deceleration movement and protect the unidirectional motor 1 from damage.

[0030] Uniform deceleration stage (4-4.2 seconds): In this stage, the output shaft of the unidirectional motor 1 is Figure 4 The fourth section of the six-point curve shown enters a uniform deceleration stage until the speed reaches zero.

[0031] During the above-mentioned uniform speed buffering stage and uniform deceleration stage, the mixer 5 loses the driving effect of the rotating shaft 2. When the rotating shaft 2 stops rotating, the mixer 5 continues to rotate clockwise under the action of inertia. Since the rotating shaft 2 and the guide post 4 are stationary, the guide post 4 will be separated from the horizontal groove of the mixer 5. The mixer 5 drops to the lowest position under the action of gravity of the mixer 5 and the counterweight 10, and finally reaches a stationary state.

[0032] It should be noted that, in the description of the present invention, terms indicating orientation or positional relationships such as “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “inside”, and “outside” are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

Claims

1. A lifting and mixing device, characterized in that: The device comprises a driver and a mixer, wherein the output shaft of the driver is fixedly connected to a rotating shaft, a guide post extending radially is provided on the rotating shaft, the mixer is sleeved on the rotating shaft, a spiral groove for passing the guide post is provided on the side wall of the mixer, a support is provided on the top of the mixer, and a counterweight is provided on the bottom of the mixer; The driver works in the following manner during the lifting and mixing process: In the first step, the output shaft of the driver enters the first uniform acceleration stage, which is used to make the mixer rise. During this process, the guide post moves from the top starting end of the spiral groove to the bottom ending end of the spiral groove; In the second step, the output shaft of the driver enters the second uniform acceleration stage, which is used to keep the mixer rotating at the highest position. During this process, the speed of the output shaft is always greater than the speed in the first uniform acceleration stage. In the third step, the output shaft of the driver first rotates at a uniform speed and then enters a uniform deceleration stage until the speed reaches zero. During this process, the mixer descends and the guide column reaches the top starting end of the spiral groove from the bottom end end of the spiral groove.

2. The lifting and mixing device according to claim 1, characterized in that: The spiral channel is provided with a ridge connected to the guide column, and the width of the contact surface between the ridge and the guide column is smaller than the wall thickness of the mixer.

3. The lifting and mixing device according to claim 1, characterized in that: The bottom terminal end of the spiral groove is arranged in the horizontal direction, and a boss for reducing the groove diameter is arranged at the inlet of the horizontal section of the spiral groove.

4. The lifting and mixing device according to claim 1, characterized in that: An exhaust hole is provided on the side wall of the mixer.

5. The lifting and mixing device according to claim 1, characterized in that: A supporting groove with an upper opening structure is provided on the top of the support, and the central axis of the supporting groove is arranged parallel to the central axis of the rotating shaft.

6. The lifting and mixing device according to claim 5, characterized in that: The side wall of the support is provided with a drainage hole communicated with the support groove.

7. The lifting and mixing device according to claim 1, characterized in that: The counterweight block is a counterweight ring coaxially arranged with the mixer.

8. The lifting and mixing device according to claim 1, characterized in that: The driver is provided with a fixing column extending upward.

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