A reciprocating biological shaker

Abstract

This invention discloses a reciprocating biological shaker, comprising a frame, a drive unit, an eccentric transmission assembly, an internal gear ring, a driven gear, a linear guide assembly, and a motion platform. The drive unit is mounted on the frame, and the eccentric transmission assembly is connected to the drive unit and driven by the drive unit to rotate around a fixed main axis. The driven gear is mounted on the eccentric end of the eccentric transmission assembly, and meshes with the internal gear ring, with the pitch circle diameter of the internal gear ring being twice the pitch circle diameter of the driven gear. The motion platform is connected to a preset connection point on the driven gear, and during its movement, the driven gear drives the motion platform to perform a pure linear reciprocating motion along the linear guide assembly. This invention utilizes the Cardan circle geometry principle, achieving continuous meshing and pure rolling transmission between the internal gear ring and the driven gear across the entire range, completely eliminating the reversing dead points of traditional crank guide shaft and oscillating gear mechanisms.

Description

Technical Field

[0001] This invention relates to the field of biological shaker technology, specifically a reciprocating biological shaker. Background Technology

[0002] Thermostatic shaking incubators are a fundamental core piece of equipment in biological laboratories. They rely on reciprocating oscillation to achieve functions such as sample cultivation and mixing. The industry has high requirements for the stability of the oscillation, the accuracy of frequency control, and the repeatability of experimental data.

[0003] Currently, most mainstream reciprocating shaking tables on the market employ crank-guide shaft mechanisms, eccentric wheel-swing rod mechanisms, and sliding groove transmission mechanisms as their core transmission mechanisms. These traditional structures have revealed several fundamental flaws in long-term application: First, the crank-guide shaft mechanism has an inherent dead point in reversal, making the transmission prone to momentary disengagement at the reversal limit, leading to frequent jamming and stalling during start-up, stopping, and reversal. Simultaneously, the sudden load change during reversal causes significant vibration of the shaking table and large amounts of running sway, severely reducing the consistency and accuracy of biological culture and sample mixing experiments. Second, the oscillation of the guide shaft generates significant lateral forces, causing the pins, sliding guides, bushings, and other friction pairs to endure abnormal off-center loads for extended periods. After long-term operation, this can lead to problems such as amplitude attenuation, running off-center, and abnormal noises, resulting in rapid component wear and high overall maintenance costs. Third, eccentric chute mechanisms can only output approximately linear motion, with a large difference in motion speed at both ends of the stroke, which easily creates dead zones for material mixing, resulting in uneven sample mixing, poor repeatability of experimental data, poor overall mechanical balance performance under high-speed and heavy-load conditions, and obvious shaking of the whole machine.

[0004] Some existing shaking table products use a combination of gears, guide shafts, and swing rods for transmission. However, in this type of structure, the gears are only used as auxiliary components for power reversal and swing amplitude adjustment. The gear meshing is a partial, non-circular swing meshing. The gears themselves do not participate in motion trajectory constraints, and the final output of the mechanism is still circular swing motion. This does not avoid the various defects of traditional swing transmission mechanisms in principle.

[0005] In addition, some shaking tables use a friction transmission structure with a motor and a V-belt to achieve oscillation with an eccentric shaft. Although this simplifies the power transmission link and optimizes the transmission layout to a certain extent, it does not innovate the motion trajectory and transmission logic, and still has problems such as insufficient oscillation stability and excessive operating noise.

[0006] In summary, none of the existing vibration shaker transmission structures can simultaneously achieve the requirements of no dead spots throughout the entire stroke, uniform and stable speed, low wear, no lateral force, and no stirring dead zone. Summary of the Invention

[0007] To solve the above problems, the present invention provides a reciprocating biological shaker, comprising a frame, a drive unit, an eccentric transmission assembly, an internal gear ring, a driven gear, a linear guide assembly, and a motion platform. The drive unit is mounted on the frame, and the eccentric transmission assembly is connected to the drive unit and is driven by the drive unit to rotate around a fixed main axis. The internal gear ring is fixed on the frame, and the central axis of the internal gear ring coincides with the fixed main axis of the eccentric transmission assembly. The driven gear is mounted on the eccentric end of the eccentric transmission assembly. The driven gear meshes with the internal gear ring, and the pitch circle diameter of the internal gear ring is twice the pitch circle diameter of the driven gear. The driven gear moves in a circular motion around the fixed main axis with the eccentric end of the eccentric transmission assembly, while rotating around its own central axis. The linear guide assembly is fixedly mounted on the frame, and the motion platform is slidably mounted on the linear guide assembly. The motion platform is connected to a preset connection point on the driven gear, and the driven gear drives the motion platform to perform pure linear reciprocating motion along the linear guide assembly during the motion process.

[0008] Optionally, the drive unit is a servo motor; the eccentric transmission assembly includes an eccentric shaft and a belt drive mechanism, the belt drive mechanism consists of a driving pulley, a driven pulley and a V-belt; the output end of the servo motor is connected to the driving pulley, the driven pulley is fixedly mounted on the input end of the eccentric shaft, and the V-belt is wound between the driving pulley and the driven pulley, relying on the static friction between the belt and the side of the pulley groove to achieve frictional torque transmission.

[0009] Optionally, the eccentric end of the eccentric transmission assembly is provided with a gear support assembly, which includes a bearing housing and a rotary bearing; the bearing housing is fixed on the eccentric end, and the driven gear is rotatably mounted on the bearing housing through the rotary bearing, so that the driven gear can rotate smoothly around its own central axis.

[0010] Optionally, both the internal gear ring and the driven gear are involute gear structures, and they continuously mesh and maintain a pure rolling motion state throughout the entire circumference; when the driven gear moves along the inner side of the internal gear ring, the meshing position changes continuously with the motion trajectory, without any local intermittent meshing.

[0011] Optionally, the linear guide assembly includes a reciprocating left and right fixed seat, a guide optical shaft, and a flange linear bearing; the reciprocating left and right fixed seat is fixed on the frame, and both ends of the guide optical shaft are respectively fixed on the reciprocating left and right fixed seat; the flange linear bearing is fixed on the motion platform, and the flange linear bearing is sleeved on the guide optical shaft, so that the motion platform slides along the axial direction of the guide optical shaft.

[0012] Optionally, the internal gear ring is fixed to the frame by an internal gear fixing member; a positioning structure is provided between the internal gear fixing member and the internal gear ring. This positioning structure is used to limit the radial displacement and circumferential rotation of the internal gear ring, ensuring that the central axis of the internal gear ring is coaxial with the fixed main axis of the eccentric transmission assembly.

[0013] Optionally, the frame includes a lower shaft plate and a base, with a shock-absorbing pad provided between the lower shaft plate and the base; the lower shaft plate is used to mount the drive unit, the eccentric transmission assembly, and the internal gear ring, and the base supports the lower shaft plate through the shock-absorbing pad to absorb vibrations generated during operation.

[0014] Optionally, the biological shaker also includes a counterweight plate, which is disposed on the frame and cooperates with the moving parts of the eccentric transmission assembly to balance the inertial force between the eccentric transmission assembly and the driven gear, thereby reducing the dynamic load during operation.

[0015] Compared with the prior art, the present invention has the following advantages: 1. This invention utilizes the geometric principle of Cardan's circle, enabling continuous meshing and pure rolling transmission between the internal gear ring and the driven gear throughout the entire range. This fundamentally eliminates the dead points in reversing mechanisms such as traditional crank guide shafts and oscillating gear mechanisms. The power transmission is continuous and smooth throughout the entire process of equipment startup, shutdown, and reversal, without any jamming or jamming, allowing for long-term continuous and stable operation.

[0016] 2. The final output of this invention is a standard pure linear reciprocating motion, with the force direction entirely along the motion axis, eliminating the lateral force component found in traditional guide shafts and oscillating gear mechanisms. Bearings, guide rails, pins, and other friction pairs only bear positive loads, avoiding severe localized wear caused by off-center loading, reducing the probability of failure, and extending the overall service life of the machine.

[0017] 3. The linear motion speed output by this invention changes smoothly according to a sinusoidal law. The acceleration is continuous without step impact during commutation, and the load fluctuation is greatly suppressed, effectively reducing the shaking and swaying of the oscillation table, and significantly improving the consistency and detection accuracy of biological sample culture and material mixing experiments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the reciprocating biological shaker of the present invention; Figure 2 This is a partial structural diagram of the present invention. Figure 1 ; Figure 3 for Figure 2 A schematic diagram of the cross-section along A-A'; Figure 4 for Figure 2 Enlarged view of part of the structure; Figure 5This is a schematic diagram of the motion platform of the present invention; Figure 6 This is a schematic diagram of the eccentric transmission assembly of the present invention.

[0019] In the diagram: 1 - Frame; 101 - Base; 102 - Lower shaft plate; 2 - Servo motor; 3 - Eccentric transmission assembly; 301 - Eccentric shaft; 302 - Drive pulley; 303 - Driven pulley; 304 - V-belt; 4 - Internal gear ring; 401 - Internal gear fixing component; 402 - Positioning structure; 5 - Driven gear; 501 - Rotary bearing; 502 - Bearing housing; 6 - Linear guide assembly; 601 - Reciprocating left and right fixed seat; 602 - Guide optical shaft; 603 - Flange linear bearing; 7 - Motion platform; 701 - Upper bearing housing; 8 - Shock-absorbing pad; 9 - Counterweight. Detailed Implementation

[0020] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0021] The following specific examples illustrate the implementation of this disclosure. Those skilled in the art can easily understand other advantages and effects of this disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. This disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this disclosure. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0022] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this disclosure. The illustrations only show the structures related to this disclosure and are not drawn according to the actual number, shape and size of the structures in the actual implementation. In the actual implementation, the form, quantity and proportion of each structure can be arbitrarily changed, and its structural layout may also be more complex.

[0023] like Figures 1-6 A reciprocating biological shaker includes: a frame 1, a drive unit, an eccentric transmission assembly 3, an internal gear ring 4, a driven gear 5, a linear guide assembly 6, and a motion platform 7.

[0024] The drive unit is fixedly mounted on the frame 1, and the eccentric transmission assembly 3 is connected to the drive unit for transmission, and is driven by the drive unit to rotate around the fixed main axis. As the only power source of the whole machine, the drive unit continuously provides rotational power to the eccentric transmission assembly 3. The entire power transmission link is simple and reliable, and with the subsequent vibration reduction structure, transmission noise can be effectively reduced.

[0025] The internal gear ring 4 is fixedly mounted on the frame 1, and the central axis of the internal gear ring 4 coincides with the fixed main axis of the eccentric transmission assembly 3. The internal gear ring 4 remains stationary throughout the entire operation of the equipment. The coaxial design is the basic prerequisite for ensuring precise gear meshing and realizing the Cardan circular motion trajectory, and can avoid problems such as meshing interference and transmission jamming caused by axis misalignment.

[0026] The driven gear 5 is mounted on the eccentric end of the eccentric transmission assembly 3. The driven gear 5 meshes with the internal gear ring 4, and the pitch circle diameter of the internal gear ring 4 is twice the pitch circle diameter of the driven gear 5. The driven gear 5 moves in a circular motion around the fixed main axis along with the eccentric end of the eccentric transmission assembly 3, while simultaneously rotating around its own central axis. This 2:1 pitch circle diameter ratio is the core geometric condition of the Cardan circular mechanism. Unlike the traditional application of gears that only perform local oscillation and reversing transmission, in this scheme, the gear is no longer an auxiliary transmission component, but a core component that constrains the motion trajectory. The driven gear 5 simultaneously possesses a composite motion form of circular motion and rotation. Combined with the full-range meshing method, it completely eliminates the reversing dead point existing in traditional crank guide shaft and oscillating gear mechanisms in principle, ensuring continuous and shock-free transmission throughout the entire operation of the equipment.

[0027] The linear guide assembly 6 is fixedly mounted on the frame 1, and the motion platform 7 is slidably mounted on the linear guide assembly 6. The motion platform 7 is connected to a preset connection point on the driven gear 5. During its movement, the driven gear 5 drives the motion platform 7 to perform a pure linear reciprocating motion along the linear guide assembly 6. The linear guide assembly 6 forms a unidirectional trajectory constraint on the motion platform 7. Combined with the geometric output characteristics of the Cardan circle, it ultimately achieves standard pure linear reciprocating motion, completely eliminating the lateral force generated by the traditional swing mechanism. The stress state of friction pairs such as guide rails and bearings is greatly optimized, and the wear rate of parts is significantly reduced. At the same time, the uniform reciprocating motion throughout the entire stroke can eliminate the sample stirring dead zone, ensure uniform mixing of experimental samples, and improve the repeatability of experimental data.

[0028] The above structures together constitute the core transmission system of the whole machine, which stably transforms the continuous rotational motion output by the drive unit into the linear reciprocating oscillating motion of the motion platform 7, thus comprehensively solving many fundamental defects of existing shaking tables.

[0029] The core of this invention relies on the geometric constraint principle of the Cardan circle (inner cycloid), combined with mechanical friction transmission, linear guidance, and vibration reduction counterweight structure to achieve the transformation from "rotational motion to pure linear reciprocating motion".

[0030] The stationary internal gear ring has a large circle structure, while the moving driven gear on the inside has a small circle structure. The ratio of the internal gear ring's pitch circle diameter to the driven gear's pitch circle diameter is strictly followed, satisfying the necessary geometric condition for the Cardan circle to exist. A servo motor drives the eccentric shaft to rotate via a V-belt friction drive. The eccentric end of the eccentric shaft drives the driven gear to perform circular motion around a fixed main axis. Due to the pure rolling meshing of the driven gear and the stationary internal gear ring throughout their entire range, the driven gear, while performing circular motion, must also rotate uniformly around its own central axis. Under the geometric constraint of a 2:1 pitch circle diameter, the composite motion trajectory of any point on the driven gear's pitch circle is a standard straight line. A preset connection point on the pitch circle is selected as the power output point, and the linear motion is transmitted to the upper shaft plate through a hinged support. A linear guide assembly composed of an optical shaft and a flanged linear bearing further strengthens the trajectory constraint, ultimately converting the continuous rotational motion of the motor into the pure linear reciprocating motion of the motion platform.

[0031] The drive unit in this invention uses a servo motor 2; the eccentric transmission assembly 3 includes an eccentric shaft 301 and a belt drive mechanism, which consists of a driving pulley 302, a driven pulley 303, and a V-belt 304. The servo motor 2 features high speed regulation accuracy and rapid start / stop response, and can precisely match the oscillation frequencies required for different experiments, meeting the diverse needs of laboratory use.

[0032] The output end of the servo motor 2 is connected to the driving pulley 302, and the driven pulley 303 is fixedly mounted on the input end of the eccentric shaft 301. A V-belt 304 is wound between the driving pulley 302 and the driven pulley 303, transmitting torque through static friction between the belt and the sides of the pulley groove. The V-belt 304 adopts a V-shaped belt structure, relying on the static friction generated by the inclined surfaces pressing against the pulley groove to achieve power transmission. This friction transmission method has a natural buffering effect, which can weaken the impact caused by motor operation and further reduce the overall machine operating noise. At the same time, the belt drive structure is simple to disassemble and assemble, and convenient for later replacement and maintenance, effectively controlling equipment operating costs. During operation, the servo motor 2 drives the driving pulley 302 to rotate, which in turn drives the driven pulley 303 and the eccentric shaft 301 to rotate synchronously via the V-belt 304, providing stable rotational power for the subsequent gear mechanism.

[0033] The eccentric transmission assembly 3 is provided with a gear support assembly at its eccentric end. The gear support assembly includes a bearing seat 502 and a rotating bearing 501.

[0034] The bearing housing 502 is fixed to the eccentric end of the eccentric shaft 301. The driven gear 5 is rotatably mounted on the bearing housing 502 via the rotating bearing 501, allowing the driven gear 5 to rotate smoothly around its own central axis. The rotating bearing 501 significantly reduces the frictional resistance during the rotation of the driven gear 5, ensuring smooth and unhindered rotation. Simultaneously, the rigid fixation of the bearing housing 502 to the eccentric end ensures the accuracy of the driven gear 5's installation position, maintaining good meshing with the internal gear ring 4. This support structure exhibits uniform stress distribution and excellent wear resistance, providing long-term stable support for the compound motion of the driven gear 5 and further extending the overall service life of the machine.

[0035] The linear guide assembly 6 includes a reciprocating left and right fixed seat 601, a guide optical axis 602, and a flange linear bearing 603.

[0036] The reciprocating left and right fixed seats 601 are fixed on the frame 1, and both ends of the guide optical shaft 602 are respectively fixed on the reciprocating left and right fixed seats 601; the flange linear bearing 603 is fixed on the motion platform 7 and is sleeved on the guide optical shaft 602, allowing the motion platform 7 to slide along the axial direction of the guide optical shaft 602. The two sets of reciprocating left and right fixed seats 601 are symmetrically arranged to ensure that the guide optical shaft 602 is installed horizontally and subjected to balanced force; the guide optical shaft 602 and the flange linear bearing 603 form a high-precision linear pair, allowing the motion platform 7 to move linearly along the axial direction only, completely restricting radial and lateral displacement.

[0037] The internal gear ring 4 is fixed to the lower shaft plate 102 by the internal gear fixing member 401; a positioning structure 402 is provided between the internal gear fixing member 401 and the internal gear ring 4.

[0038] The positioning structure 402 restricts the radial displacement and circumferential rotation of the internal gear ring 4, ensuring that the central axis of the internal gear ring 4 is coaxial with the fixed main axis of the eccentric transmission component 3. As the reference stationary component of the Cardan circular mechanism, the internal gear ring 4's axis coincidence directly determines the gear meshing accuracy and motion trajectory accuracy. The positioning structure 402 can achieve precise positioning and locking of the internal gear ring 4, preventing gear ring misalignment and loosening caused by long-term equipment vibration, ensuring that the gear's full-circumferential meshing state remains stable, avoiding problems such as abnormal noise, accelerated wear, and trajectory deviation caused by meshing misalignment, and ensuring the long-term reliability of the equipment.

[0039] The motion platform 7 is an upper shaft plate, and an upper bearing seat 701 is provided on the side of the upper shaft plate facing the driven gear 5. The upper bearing seat 701 and the bearing seat 502 are fixedly connected by screws.

[0040] Furthermore, the frame 1 includes a lower shaft plate 102 and a base 101, with a shock-absorbing pad 8 disposed between the lower shaft plate 102 and the base 101. The lower shaft plate 102 is used to centrally mount all core transmission components such as the drive unit, the eccentric transmission assembly 3, and the internal gear ring 4. The base 101 serves as the bottom support base of the entire machine, placed on the worktable. The base 101 supports the lower shaft plate 102 through the shock-absorbing pad 8, absorbing vibrations generated during operation. The biological shaker in this embodiment also includes a counterweight 9, which is disposed on the frame 1 and cooperates with the moving parts of the eccentric transmission assembly 3. The counterweight 9 is mainly used to balance the inertial forces generated by the moving parts such as the eccentric transmission assembly 3, the driven gear 5, and the moving platform 7, reducing the dynamic load during operation. When moving parts reciprocate at high speed, they generate periodic inertial forces, which can easily cause the whole machine to shake and deteriorate the dynamic balance. The counterweight 9 is matched and set according to the weight and eccentricity of the moving parts, which can offset most of the inertial load and optimize the dynamic balance performance of the whole machine.

[0041] The working process of the biological shaker of the present invention is described below: 1. Place the experimental sample on the upper shaft plate, which serves as the motion platform 7. Set the oscillation frequency according to the experimental requirements through the control system. Start the servo motor 2 and run at the set speed.

[0042] 2. The servo motor 2 drives the active pulley 302 to rotate, and through the friction transmission of the V-belt 304, the driven pulley 303 and the eccentric shaft 301 rotate around the fixed main axis, and the eccentric end of the eccentric shaft 301 makes a circular motion accordingly.

[0043] 3. The eccentric end drives the driven gear 5 to make synchronous circular motion. Under the meshing constraint of the stationary internal gear ring 4, the driven gear 5 continues to rotate around its own axis while making circular motion. The two maintain pure rolling meshing throughout the entire circumference, with no transmission dead points throughout the entire process.

[0044] 4. The standard linear reciprocating motion is output from the connection point on the pitch circle of the driven gear 5 and transmitted to the upper shaft plate via the upper bearing seat 701. Under the guidance and constraint of the guide optical shaft 602 and the flange linear bearing 603, the upper shaft plate makes a smooth pure linear reciprocating oscillation along the axial direction, driving the sample to complete the culture and mixing operation.

[0045] 5. During operation, the shock-absorbing pad 8 continuously absorbs the vibration of the whole machine, and the counterweight 9 balances the inertial load. The whole mechanism operates at a constant speed, with low noise and stable operation, and the sample is mixed evenly without any dead zone in the stirring.

[0046] 6. After the experiment, the power was cut off, the servo motor 2 gradually slowed down and stopped, and all moving parts stopped smoothly. The upper shaft plate returned to the initial position, and there was no jamming or impact during the stopping process.

[0047] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0048] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A reciprocating biological shaker, characterized in that, It includes a frame, a drive unit, an eccentric transmission assembly, an internal gear ring, a driven gear, a linear guide assembly, and a motion platform. The drive unit is mounted on the frame, and the eccentric transmission assembly is connected to the drive unit and is driven by the drive unit to rotate around a fixed main axis. The internal gear ring is fixed on the frame, and the central axis of the internal gear ring coincides with the fixed main axis of the eccentric transmission assembly. The driven gear is mounted on the eccentric end of the eccentric transmission assembly. The driven gear meshes with the internal gear ring, and the pitch circle diameter of the internal gear ring is twice the pitch circle diameter of the driven gear. The driven gear moves in a circular motion around the fixed main axis with the eccentric end of the eccentric transmission assembly, while rotating around its own central axis. The linear guide assembly is fixedly mounted on the frame, and the motion platform is slidably mounted on the linear guide assembly. The motion platform is connected to a preset connection point on the driven gear, and the driven gear drives the motion platform to perform pure linear reciprocating motion along the linear guide assembly during the motion process.

2. The reciprocating biological shaker according to claim 1, characterized in that, The drive unit uses a servo motor; the eccentric transmission assembly includes an eccentric shaft and a belt drive mechanism, the belt drive mechanism consists of a driving pulley, a driven pulley and a V-belt; the output end of the servo motor is connected to the driving pulley, the driven pulley is fixedly mounted on the input end of the eccentric shaft, and the V-belt is wound between the driving pulley and the driven pulley, relying on the static friction between the belt and the side of the pulley groove to achieve frictional torque transmission.

3. The reciprocating biological shaker according to claim 1, characterized in that, The eccentric transmission assembly has a gear support assembly at its eccentric end, which includes a bearing housing and a rotating bearing. The bearing housing is fixed on the eccentric end, and the driven gear is rotatably mounted on the bearing housing through the rotating bearing, so that the driven gear can rotate smoothly around its own central axis.

4. The reciprocating biological shaker according to claim 1, characterized in that, Both the internal gear ring and the driven gear are involute gear structures. They continuously mesh and maintain a pure rolling motion throughout the entire circumference. When the driven gear moves along the inner side of the internal gear ring, the meshing position changes continuously with the motion trajectory, without any local intermittent meshing.

5. The reciprocating biological shaker according to claim 1, characterized in that, The linear guide assembly includes a reciprocating left and right fixed seat, a guide optical shaft, and a flange linear bearing; the reciprocating left and right fixed seat is fixed on the frame, and both ends of the guide optical shaft are respectively fixed on the reciprocating left and right fixed seat; the flange linear bearing is fixed on the motion platform, and the flange linear bearing is sleeved on the guide optical shaft, so that the motion platform slides along the axial direction of the guide optical shaft.

6. The reciprocating biological shaker according to claim 1, characterized in that, The internal gear ring is fixed to the frame by an internal gear fixing member; a positioning structure is provided between the internal gear fixing member and the internal gear ring to limit the radial displacement and circumferential rotation of the internal gear ring, and to ensure that the central axis of the internal gear ring is coaxial with the fixed main axis of the eccentric transmission assembly.

7. The reciprocating biological shaker according to claim 1, characterized in that, The frame includes a lower shaft plate and a base, with a shock-absorbing pad provided between the lower shaft plate and the base; the lower shaft plate is used to mount the drive unit, the eccentric transmission assembly and the internal gear ring, and the base supports the lower shaft plate through the shock-absorbing pad to absorb vibrations generated during operation.

8. The reciprocating biological shaker according to claim 1, characterized in that, It also includes a counterweight plate, which is disposed on the frame and cooperates with the moving parts of the eccentric transmission assembly to balance the inertial force between the eccentric transmission assembly and the driven gear, thereby reducing the dynamic load during operation.

Images