Self-locking driving mechanism applied to centrifugal machine

Abstract

The invention relates to the technical field of centrifugal machines, in particular to a self-locking driving mechanism applied to a centrifugal machine, and the self-locking driving mechanism is characterized in that a sliding block is obliquely and downwards arranged on the surface of a sliding column and is matched with a sliding hole in a driving seat to limit the sliding block, and an upper pressing block and an elastic element spring limit the sliding column; the vertical movement of the sliding column can be converted into the horizontal movement of the sliding block, and then through the clamping ring groove matched with the sliding block in the center sleeve of the rotating head, the angle rotating head or the horizontal rotating head can be quickly disassembled or assembled only by slightly pressing the lower sliding column. When the rotary head is driven to rotate through self-locking, all the symmetrical sliding blocks wriggle slightly towards the periphery under the action of centrifugal force, and then the center sleeve connected with the rotary head is expanded and pressed in a redundant mode better; the expansion force and the pressing force are increased along with the increase of the rotating speed, so that the rotating head rotates more firmly, and self-locking driving is safer and more reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifuges, and in particular to a self-locking drive mechanism used in centrifuges. Background Art

[0002] The self-locking drive mechanism of domestic centrifuges primarily utilizes the elastic force of a spring to slightly push out a movable block, thereby tightening the rotor and transmitting torque through a needle roller to drive the rotor's rotation. The main drawbacks of this self-locking drive are: 1. The self-locking performance is affected by the quality of the spring, and its locking effect becomes highly random after long-term use; 2. Due to its asymmetric structure, the imbalance increases with increasing speed, thereby affecting its dynamic performance. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the present invention provides a self-locking drive mechanism for use in a centrifuge.

[0004] The self-locking drive mechanism applied to a centrifuge of the present invention comprises:

[0005] A self-locking drive for connecting the motor spindle and the rotary head, the self-locking drive comprising a drive seat, the drive seat being mounted on the motor spindle via a connector;

[0006] A center sleeve is installed on the inner wall of the center hole of the rotating head, and a docking hole is opened on the inner wall of the center sleeve to fit on the surface of the driving seat;

[0007] The top of the drive seat is provided with a mounting cavity, and a sliding column is movably inserted into the mounting cavity of the drive seat. The sliding column includes a column body, and the surface of the column body is connected to a plurality of symmetrically arranged sliding blocks that slide downwardly in an inclined manner. The surface of the drive seat is provided with sliding holes that are adapted to the sliding blocks.

[0008] A snap ring groove is provided on the inner wall of the docking hole of the center sleeve corresponding to the sliding block, and the sliding block slides horizontally in the sliding hole by the lifting and lowering of the sliding column.

[0009] An upper pressure block for limiting the vertical highest position of the sliding column is installed on the top of the driving seat through a support platform on the inner wall of the installation cavity. An elastic element is installed between the inner wall of the installation cavity and the sliding column. The elastic element is used to make the sliding column be in the highest position when no external force is applied.

[0010] The elastic element is a spring, and the connecting piece is a central column inserted into the spring and the center of the installation cavity. A portion of the central column passes through the bottom of the driving seat and is connected to the motor main shaft.

[0011] A column cavity adapted to the central column is provided at the center of the sliding column. The central column is inserted into the column cavity, and a limiting groove for limiting the spring is provided at the bottom of the column cavity.

[0012] The bottom of the drive seat is provided with a conical docking hole adapted to the spindle cone surface of the motor spindle; the surface of the drive seat is provided with a driving cone surface adapted to the inner wall of the center sleeve; the upper section of the drive seat is provided with a guide inclined surface.

[0013] The slide post and the slider are slidably connected via a T-shaped rail mounted on the surface of the slide post and a T-shaped slot provided on the slider, and the T-shaped rail and the T-shaped slot form a guide rail pair.

[0014] Specifically, the outer side of the slider is provided with a compression inclined surface, and the bottom of the outer side of the inclined surface of the slider protrudes to form a tightening surface that is compatible with the snap ring groove, and the bottom of the tightening surface is inclined inward to form a downward pressure inclined surface, and the inner wall of the snap ring groove is provided with a ring groove inclined surface that is compatible with the downward pressure inclined surface.

[0015] Furthermore, a push rod connected to the top of the sliding column is installed on the rotating head, and a button for driving the push rod is provided on the top of the push rod.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention uses self-locking drive to rotate with the rotor. Under the action of centrifugal force, each symmetrical slider will have a slight creep toward the periphery, thereby better redundantly tightening and pressing the center sleeve connected to the rotor; as the speed increases, the expansion and compression forces also increase accordingly, and the rotor is locked more firmly as it rotates, making the self-locking drive safer and more reliable, thereby solving the problems in the prior art that the self-locking performance is affected by the processing quality of the spring piece, its locking effect is highly random after long-term use, and the existing self-locking mechanism structure is asymmetric.

[0018] 2. The present invention uses a slider arranged obliquely downward on the surface of the slide column, which cooperates with the sliding hole on the drive seat to limit the slider, and the upper pressure block and the elastic element spring to limit the slide column, so that the vertical movement of the slide column can be converted into the horizontal movement of the slider. Then, through the clamping ring groove in the center sleeve of the swivel head that is adapted to the slider, the angular swivel head or the horizontal swivel head can be quickly disassembled or installed by lightly pressing the slide column; there is no need to tighten the screws with tools to compress the swivel head, thereby better reducing the difficulty of installing the swivel head.

[0019] 3. The present invention tightens the center sleeve of the rotary head by the slider and generates a downward pressure on the center sleeve by pressing the inclined surface, so that the center sleeve is closely fitted to the driving cone surface, thereby better transmitting the friction torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0021] Figure 1 This is a front view and a cross-sectional view of the self-locking drive of the present invention;

[0022] Figure 2 This is an exploded view of the self-locking drive of the present invention;

[0023] Figure 3 This is a cross-sectional diagram of the practical compact rotor;

[0024] Figure 4 This is a cross-sectional diagram of the self-locking drive release rotor of the present invention;

[0025] Figure 5 It is a front view and a cross-sectional view of the drive seat of the present invention;

[0026] Figure 6 The main view and cross-sectional view of the slider of the present invention;

[0027] Figure 7 It is the front view and cross-sectional view of the sliding column of the present invention.

[0028] In the figure: a, self-locking drive; b, motor spindle; c, rotary head;

[0029] 1. Sliding column; 1.1. Column cavity; 1.2. T-rail; 1.3. Column body;

[0030] 2. Driving seat; 2.1. Conical docking hole; 2.2. Driving cone; 2.3. Sliding hole; 2.4. Guide slope; 2.5. Support platform;

[0031] 3. Slider; 3.1. Pressing inclined surface; 3.2. Expansion surface; 3.3. Compression inclined surface; 3.4. T-slot;

[0032] 4. Center column; 5. Spring; 6. Upper pressure block; 7. Button; 8. Push rod; 9. Spindle cone; 10. Center sleeve; 10.1. Snap ring groove; 10.2. Ring groove inclined surface. DETAILED DESCRIPTION

[0033] The following drawings illustrate various embodiments of the present invention. For clarity, many physical details will be included in the following description. However, it should be understood that these physical details are not intended to limit the present invention. In other words, in some embodiments of the present invention, these physical details are not essential. Furthermore, to simplify the drawings, some commonly used structures and components are depicted in simplified schematic form.

[0034] In addition, in the present invention, descriptions such as "first" and "second" are only used for descriptive purposes and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] See also Figure 1-Figure 7 The self-locking drive mechanism of the present invention applied to a centrifuge comprises:

[0036] A self-locking drive a for connecting the motor spindle b and the rotary head c, wherein the self-locking drive a comprises a drive seat 2, which is mounted on the motor spindle b via a connecting piece;

[0037] A center sleeve 10 is installed on the inner wall of the center hole of the rotating head c, and a docking hole is opened on the inner wall of the center sleeve 10 to fit on the surface of the driving seat 2;

[0038] The top of the drive seat 2 is provided with a mounting cavity, within which a slide post 1 is movably inserted. The slide post 1 includes a column 1.3. The surface of the column 1.3 is connected to a plurality of symmetrically arranged slide blocks 3 that slide downwardly and tilted. The surface of the drive seat 2 is provided with sliding holes 2.3 that are adapted to the slide blocks 3.

[0039] A snap ring groove 10.1 is provided on the inner wall of the docking hole of the center sleeve 10 corresponding to the slider 3. The slider 3 slides horizontally in the sliding hole 2.3 by the lifting and lowering of the slide post 1.

[0040] An upper pressure block 6 for limiting the vertical highest position of the sliding column 1 is installed on the top of the driving seat 2 through the support platform 2.5 on the inner wall of the mounting cavity. An elastic element is installed between the inner wall of the mounting cavity and the sliding column 1. The elastic element is used to make the sliding column 1 be in the highest position when no external force is applied, so that the sliders 3 on the sliding column 1 are always in a tensioned state when they are free.

[0041] The elastic element is a spring 5, and the connecting part is a center column 4 inserted into the spring 5 and the center of the mounting cavity. Part of the center column 4 passes through the bottom of the drive seat 2 and is connected to the motor spindle b. The center column 4 is used to press the drive seat 2 to ensure that it is firmly connected to the motor spindle b and at the same time ensure that the spring 5 is centered.

[0042] A column cavity 1.1 adapted to the central column 4 is provided in the center of the sliding column 1. The central column 4 is inserted into the column cavity 1.1. A limiting groove for limiting the spring 5 is provided at the bottom of the column cavity 1.1.

[0043] The bottom of the driving seat 2 is provided with a conical docking hole 2.1 which is compatible with the spindle cone surface 9 of the motor spindle b, ensuring that the driving seat 2 is coaxial with the spindle cone surface 9 and in close contact with the spindle cone surface 9 to transmit the friction torque; the surface of the driving seat 2 is provided with a driving cone surface 2.2 which is compatible with the inner wall of the center sleeve 10; it is mainly used to transmit the friction torque to the rotor c through the center sleeve 10 to drive the rotor c to rotate centrifugally; the upper section of the driving seat 2 is provided with a guide slope 2.4, which mainly ensures that the rotor c can be easily aligned and slide down smoothly.

[0044] The slide post 1 and the slider 3 are slidably connected via a T-shaped rail 1.2 mounted on the surface of the slide post 1 and a T-shaped slot 3.4 provided on the slider 3, and the T-shaped rail 1.2 and the T-shaped slot 3.4 form a guide rail pair.

[0045] The outer side of the slider 3 is provided with a compression inclined surface 3.3, and the bottom of the outer side of the inclined surface of the slider 3 protrudes to form a tightening surface 3.2 adapted to the snap ring groove 10.1. The bottom of the tightening surface 3.2 is inclined inward to form a downward pressing inclined surface 3.1, and the inner wall of the snap ring groove 10.1 is provided with a ring groove inclined surface 10.2 adapted to the downward pressing inclined surface 3.1.

[0046] A push rod 8 connected to the top of the slide column 1 is also installed on the rotating head c, and a button 7 for driving the push rod 8 is provided on the top of the push rod 8.

[0047] The guide rail pair can be in the form of T-slot 3.4, dovetail slot, V-slot, Y-slot, etc. The slider 3 and the precision parts such as the slide column 1 and the drive seat 2 are designed to be separated, which is convenient for precision processing and simple assembly, thereby effectively reducing its process requirements.

[0048] When using the present invention:

[0049] Only need to gently press the button 7 on the swivel head C to make the push rod 8 press the slide post 1 downward. At this time, the slide post 1 can slide vertically downward within a limited displacement range in the installation cavity under the restriction of the upper pressure block 6. When the slide post 1 moves vertically downward, the guide rail pair composed of the T-rail 1.2 set obliquely downward and the T-slot 3.4 on the slider 3 makes the slider 3 slide horizontally inward synchronously within a limited displacement range in the sliding hole 2.3 of the drive seat 2. When the button 7 is released, the slide post 1 loses the downward pressure. At this time, the slide post 1 rises and resets under the drive of the elastic element spring 5, so that the slider 3 extends horizontally in the sliding hole 2.3 to connect with the snap ring groove 10.1 on the center sleeve 10, so that the swivel head C can be flexibly and easily locked and released; the angular swivel head or the horizontal swivel head can be quickly disassembled or installed; there is no need to tighten the screws to compress the swivel head with tools, thereby better reducing the difficulty of installing the swivel head;

[0050] When the self-locking drive a rotates with the rotor c, each slider 3 will creep slightly toward the periphery under the action of centrifugal force, thereby more redundantly expanding and pressing the center sleeve 10 connected to the rotor c. As the speed increases, the expansion and pressing force also increases, and the rotor c is locked more firmly as it rotates, making the self-locking drive a safer and more reliable.

[0051] While tightening the center sleeve 10 on the rotor c, the slider 3 exerts downward pressure on the center sleeve 10 through the downward pressing inclined surface 3.1 on the slider 3, causing the rotor c to fit tightly against the driving conical surface 2.2 of the driving seat 2, thereby better transmitting the friction torque.

[0052] When installing the turntable c: you only need to align the center sleeve 10 of the turntable c with the drive head of the self-locking drive a, gently put down the turntable c, the slider 3 is squeezed and compressed back into the drive seat 2 by the center sleeve 10 on the turntable c, and then immediately pops out and is clamped into the clamping ring groove 10.1 of the center sleeve 10 under the drive of the elastic element spring 5, and you can hear a crisp "click" sound, so you can judge that the turntable c has been self-locked; when disassembling the turntable c, you only need to gently press the button 7 of the turntable c, and after each slider 3 is retracted into the drive seat 2, you can easily lift the turntable c.

[0053] The above is merely an embodiment of the present invention and is not intended to limit the present invention. It will be apparent to those skilled in the art that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of the claims of the present invention.

Claims

1. A self-locking drive mechanism used in a centrifuge, characterized in that: include: A self-locking drive (a) for connecting a motor spindle (b) and a rotary head (c), wherein the self-locking drive (a) comprises a drive seat (2), and the drive seat (2) is mounted on the motor spindle (b) via a connecting piece; A center sleeve (10) is installed on the inner wall of the center hole of the rotating head (c), and a docking hole is opened on the inner wall of the center sleeve (10) to fit on the surface of the driving seat (2); The top of the drive seat (2) is provided with an installation cavity, a slide column (1) is movably inserted into the installation cavity of the drive seat (2), the slide column (1) includes a column (1.3), the surface of the column (1.3) is connected to a plurality of symmetrically arranged slide blocks (3) in an inclined downward sliding manner, and the surface of the drive seat (2) is provided with a sliding hole (2.3) adapted to the slide blocks (3); A snap ring groove (10.1) is provided on the inner wall of the docking hole of the center sleeve (10) corresponding to the slider (3), and the slider (3) slides horizontally in the sliding hole (2.3) by the lifting and lowering of the slide column (1).

2. The self-locking drive mechanism for a centrifuge according to claim 1, characterized in that: An upper pressing block (6) for limiting the vertical highest position of the sliding column (1) is installed on the top of the driving seat (2) through a support platform (2.5) on the inner wall of the installation cavity. An elastic element is installed between the inner wall of the installation cavity and the sliding column (1). The elastic element is used to keep the sliding column (1) at the highest position when no external force is applied.

3. The self-locking drive mechanism for a centrifuge according to claim 2, characterized in that: The elastic element is a spring (5), and the connecting piece is a center column (4) inserted into the spring (5) and the center of the installation cavity. A portion of the center column (4) passes through the bottom of the drive seat (2) and is connected to the motor main shaft (b).

4. The self-locking drive mechanism for a centrifuge according to claim 3, characterized in that: A column cavity (1.1) adapted to the central column (4) is provided at the center of the sliding column (1); the central column (4) is inserted into the column cavity (1.1); and a limiting groove for limiting the spring (5) is provided at the bottom of the column cavity (1.1).

5. The self-locking drive mechanism for a centrifuge according to claim 2, characterized in that: The bottom of the drive seat (2) is provided with a conical docking hole (2.1) adapted to the spindle cone surface (9) of the motor spindle (b); the surface of the drive seat (2) is provided with a driving cone surface (2.2) adapted to the inner wall of the center sleeve (10); and the upper section of the drive seat (2) is provided with a guide inclined surface (2.4).

6. The self-locking drive mechanism for a centrifuge according to claim 1, characterized in that: The slide post (1) and the slider (3) are slidably connected via a T-shaped rail (1.2) mounted on the surface of the slide post (1) and a T-shaped slot (3.4) provided on the slider (3), and the T-shaped rail (1.2) and the T-shaped slot (3.4) form a guide rail pair.

7. The self-locking drive mechanism for a centrifuge according to claim 2, characterized in that: The outer side of the slider (3) is provided with a compression inclined surface (3.3); the outer bottom of the inclined surface of the slider (3) is protruding to form an expansion surface (3.2) adapted to the snap ring groove (10.1); the bottom of the expansion surface (3.2) is inclined inwardly to form a downward pressing inclined surface (3.1); and the inner wall of the snap ring groove (10.1) is provided with a ring groove inclined surface (10.2) adapted to the downward pressing inclined surface (3.1).

8. The self-locking drive mechanism for a centrifuge according to claim 2, characterized in that: The rotating head (c) is also provided with a push rod (8) connected to the top of the sliding column (1), and a button (7) for driving the push rod (8) is provided on the top of the push rod (8).

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