Three-dimensional magnetic stirrer

Abstract

The invention relates to the technical field of magnetic stirrers, in particular to a three-dimensional magnetic stirrer which comprises a matching structure and a control structure, and the rear end of the matching structure is fixedly connected with the control structure; the matching structure is used for being matched with stirring work, the electric control telescopic rod controls the ball block and the stirrer to conduct longitudinal telescopic adjustment, the telescopic adjusting frame conducts transverse telescopic adjustment, and the stirrer is rotationally adjusted at the lower end of the electric control telescopic rod through the ball block; the control structure is used for rotationally controlling work, the stepping motor is connected with the rotating block through a rotating guide disc and controls the magnetic block to rotate, the electric control telescopic rod base is in butt joint and fixed with the rotating block through stretching and retracting, and when the rotating block rotates at the moment, the lantern ring is driven to rotate, so that the whole storage component is controlled to rotate; a telescopic adjusting frame is fixedly arranged at the upper end of the carrying frame and conducts transverse telescopic adjustment. Through the arrangement of the structure, the stirring control work is convenient to carry out.

Description

Technical Field

[0001] This invention relates to the field of magnetic stirrer technology, specifically a magnetic stirrer for three-dimensional use. Background Technology

[0002] A magnetic stirrer is a laboratory instrument used for mixing liquids, primarily for stirring or simultaneously heating and stirring low-viscosity liquids or solid-liquid mixtures. Its basic principle is based on the repulsion and attraction of like poles in a magnetic field. The magnetic field drives a magnetic stir bar placed in a container to rotate in a circular motion, thus achieving the purpose of stirring the liquid. Combined with a heating and temperature control system, it can heat and control the sample temperature according to specific experimental requirements, maintaining the necessary temperature conditions to ensure the liquid is mixed to the required experimental consistency.

[0003] Currently, magnetic stirrers are not convenient for three-dimensional use. They can only control the magnetic block to rotate inside the measuring cup for mixing. They are not convenient for adjustment, cannot control the rotation of the measuring cup, and are also inconvenient for voltage adjustment. Summary of the Invention

[0004] To address the problems in the prior art, the present invention provides a magnetic stirrer that can be used in three dimensions.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a three-dimensional magnetic stirrer, including a mating structure and a control structure, wherein the control structure is fixedly connected to the rear end of the mating structure;

[0006] The structure is designed for use in conjunction with stirring operations. An electrically controlled telescopic rod controls the longitudinal extension and retraction of the ball block and stirrer, while a telescopic adjustment frame provides lateral extension and retraction. The stirrer is adjusted by rotating the ball block at the lower end of the electrically controlled telescopic rod. The material to be stirred is placed in the storage cup, which is then inserted into the control unit via a limit block and a conical sleeve. At this point, the docking rod is engaged with the conical sleeve. When the ball block needs to rotate independently, a stepper motor drives the rotating guide plate, and the output rod on the side block is limited in rotation by a rotating shaft. At this time, the rotating guide plate rotates within the limiting top plate, and the rotating guide plate drives the rotating block to rotate, causing the magnetic block to rotate as well. The rotating block rotates within the collar, and the rotation of the magnetic block can drive the stir bar to rotate as well, causing the stir bar to rotate through the ball block at the lower end of the electrically controlled telescopic rod. The telescopic adjustment frame can adjust the position of the electrically controlled telescopic rod, the ball block, and the stir bar laterally, and the electrically controlled telescopic rod can control the longitudinal position adjustment of the ball block and the stir bar, causing the stir bar to change its height. Under the action of the magnetic block, the stir bar rotates within the storage cup to achieve the purpose of mixing and stirring.

[0007] The control structure is used for rotation control. The stepper motor is connected to the rotating block through the rotating guide plate to control the rotation of the magnetic block. The electrically controlled telescopic rod seat is fixed to the rotating block by telescopic extension. When the rotating block rotates, it drives the collar to rotate, thereby controlling the overall rotation of the storage component.

[0008] Specifically, the cooperating structure includes a support frame, with a telescopic adjustment frame fixedly installed at the upper end of the support frame. The telescopic adjustment frame is laterally telescopically adjustable, and an electrically controlled telescopic rod is limited at the front end of the telescopic adjustment frame. A ball block and a stirrer are telescopically connected to the lower end of the electrically controlled telescopic rod, and the stirrer rotates at the lower end of the electrically controlled telescopic rod through the ball block.

[0009] Specifically, the control structure includes a storage component and a control component. The upper end of the control component is equipped with a storage component, and the control component controls whether the storage component rotates by adjustment.

[0010] Specifically, the storage component includes a conical sleeve block, a limiting block fixedly connected to the conical sleeve block, and a storage cup fixedly provided at the upper end of the limiting block.

[0011] Specifically, the control component includes a limit control mechanism and a power guiding mechanism. The upper end of the power guiding mechanism is fixedly connected to the limit control mechanism. The limit control mechanism includes a limiting unit and a control unit, and the limiting unit is rotatably equipped with a control unit.

[0012] Specifically, the limiting unit includes a support base, a side block fixedly connected to the inner ring of the support base, a spring rod fixedly mounted on the support base, a telescopic adjustment block telescopically connected to the spring rod, and a contact wheel rotatably mounted at the end of the telescopic adjustment block. Through the structural arrangement of the cooperating structure, it can cooperate with the control structure. The user can pull out the electrically controlled telescopic rod, the ball block, and the stir bar through the telescopic adjustment frame. At the same time, the electrically controlled telescopic rod can control the lowering adjustment of the ball block and the stir bar. The support frame provides bottom support for the control structure. The conical sleeve block inside the storage component is inserted into the docking rod, and the conical sleeve block contacts the contact wheel. The limiting block restricts the top of the contact wheel, thereby controlling whether the storage component rotates.

[0013] Specifically, the control unit includes a rotating block and a magnetic block. The rotating block has a magnetic block at its center, and a collar is sleeved on the outer side of the rotating block. A connecting rod is fixedly connected to the collar, and an electrically controlled telescopic rod seat is fixedly installed at the front end of the collar. The electrically controlled telescopic rod seat is connected to the rotating block through telescopic control. The rotating block has a rod groove that matches the electrically controlled telescopic rod seat. When it is necessary to control the rotation of the storage component, the electrically controlled telescopic rod seat works, causing the rod to extend and fit into the rotating block. Thus, when the rotating block rotates, it causes the collar to rotate as well. The collar drives the conical sleeve block to move through the connecting rod. At this time, the storage cup and the limiting block rotate together, achieving integrated rotation. The stirring bar can also rotate in coordination to achieve efficient mixing.

[0014] Specifically, the power guiding mechanism includes a rotating guide plate and a limiting top plate. The rotating guide plate is rotatably mounted at the center of the limiting top plate, and a rotating shaft is rotatably mounted at the lower end of the limiting top plate. A stepper motor is fixedly mounted at the lower end of the rotating guide plate, and a conical sleeve is sleeved on the outside of the stepper motor. The rotating block facilitates the rotation of the magnetic block, thereby allowing the stirrer to rotate and adjust accordingly. The rotating block rotates within a collar, and an electrically controlled telescopic rod seat is mounted on the collar. The electrically controlled telescopic rod seat contains a telescopic rod body that can dock with the rotating block, so that when the rotating block rotates, it drives the collar to rotate, allowing the entire storage component to rotate. This allows the rotation of the storage component to be controlled according to actual conditions. The stepper motor controls the rotation of the rotating block through the rotating guide plate, and the rotating shaft ensures the stability of the stepper motor output rod.

[0015] Specifically, the rotating shaft is used for contact with the upper output shaft of the stepper motor to ensure stable output. The rotating guide plate controls the rotation of the rotating block. When the electrically controlled telescopic rod seat is fixed to the rotating block through the rod body, it drives the collar to rotate with the rotating block. The connecting rod is adapted to the tapered sleeve block for insertion. The upper end of the tapered sleeve block rotates and contacts the contact wheel. The collar is connected in the side block through a bearing.

[0016] The beneficial effects of this invention are:

[0017] First, the present invention, through its structural design, can cooperate with the control structure. The user can pull out the electrically controlled telescopic rod, ball block, and stirrer through the telescopic adjustment frame. At the same time, the electrically controlled telescopic rod can control the lowering and adjustment of the ball block and stirrer. The support frame provides bottom support for the control structure. The conical sleeve block inside the storage component is inserted into the docking rod, and the conical sleeve block contacts the contact wheel. The limiting block restricts the top of the contact wheel, thereby controlling whether the storage component rotates.

[0018] Second, the present invention facilitates the rotation of the magnetic block by setting a rotating block, thereby enabling the stirrer to rotate and adjust accordingly. The rotating block rotates within the collar, on which an electrically controlled telescopic rod seat is installed. The electrically controlled telescopic rod seat contains a telescopic rod body that can dock with the rotating block, so that when the rotating block rotates, it drives the collar to rotate, allowing the entire storage component to rotate. This allows the rotation of the storage component to be controlled according to actual conditions. The stepper motor controls the rotation of the rotating block through the rotating guide plate, and the setting of the rotating shaft ensures the stability of the stepper motor output rod. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a three-dimensional structural diagram of the main body from a frontal perspective in this invention;

[0021] Figure 2 This is a perspective view of the mating structure in this invention;

[0022] Figure 3 This is a perspective view of the control structure in this invention;

[0023] Figure 4 This is a split diagram of the control structure in this invention;

[0024] Figure 5 This is a perspective view of the storage component in this invention;

[0025] Figure 6 This is a perspective view of the control component in this invention;

[0026] Figure 7 This is a perspective view of the limit control mechanism in this invention;

[0027] Figure 8 This is a perspective view of the limiting unit in this invention;

[0028] Figure 9 This is a perspective view of the control unit in this invention;

[0029] Figure 10 This is an exploded view of the power guidance mechanism in this invention.

[0030] In the diagram: 1-Matching structure, 2-Control structure, 3-Telescopic adjustment frame, 4-Electrically controlled telescopic rod, 5-Ball block, 6-Stirring element, 7-Carrier frame, 8-Storage component, 9-Control component, 10-Storage cup, 11-Limit block, 12-Conical sleeve block, 13-Limit control mechanism, 14-Power guiding mechanism, 15-Limiting unit, 16-Control unit, 17-Telescopic adjustment block, 18-Spring rod, 19-Contact wheel, 20-Side block, 21-Support seat, 22-Rotating block, 23-Magnetic block, 24-Connecting rod, 25-Collar ring, 26-Electrically controlled telescopic rod seat, 27-Rotating guide plate, 28-Limit top plate, 29-Rotating shaft, 30-Stepper motor, 31-Conical sleeve. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0032] The invention will be further described below with reference to the accompanying drawings.

[0033] Example

[0034] like Figure 1-10 As shown, a three-dimensional magnetic stirrer of the present invention includes a mating structure 1 and a control structure 2, wherein the control structure 2 is fixedly connected to the rear end of the mating structure 1.

[0035] The structure 1 is used to assist in the stirring operation. The electric telescopic rod 4 controls the longitudinal extension and retraction of the ball block 5 and the stirring element 6, while the telescopic adjustment frame 3 performs the lateral extension and retraction adjustment. The stirring element 6 is adjusted by rotating the ball block 5 at the lower end of the electric telescopic rod 4.

[0036] Control structure 2 is used for rotation control. Stepper motor 30 is connected to rotating block 22 through rotating guide plate 27 to control the rotation of magnetic block 23. The electrically controlled telescopic rod seat 26 is connected and fixed to rotating block 22 through telescopic extension. When rotating block 22 rotates, it drives collar 25 to rotate, thereby controlling the overall rotation of storage component 8.

[0037] The supporting structure 1 includes a support frame 7. The upper end of the support frame 7 is fixedly provided with a telescopic adjustment frame 3. The telescopic adjustment frame 3 is laterally telescopically adjustable. The front end of the telescopic adjustment frame 3 is limited by an electrically controlled telescopic rod 4. The lower end of the electrically controlled telescopic rod 4 is telescopically connected to a ball block 5 and a stirrer 6. The stirrer 6 rotates at the lower end of the electrically controlled telescopic rod 4 through the ball block 5.

[0038] The control structure 2 includes a storage component 8 and a control component 9. The upper end of the control component 9 is limited by the storage component 8. The control component 9 controls whether the storage component 8 rotates by adjusting the control. When the storage component 8 needs to be rotated, the electrically controlled telescopic rod seat 26 works, causing the rod to extend and fit into the rotating block 22. Thus, when the rotating block 22 rotates, the collar 25 rotates accordingly. The collar 25 drives the conical sleeve block 12 to move through the connecting rod 24. At this time, the storage cup 10 and the limiting block 11 rotate together, achieving integrated rotation. The stirring bar 6 can also rotate in coordination to achieve efficient mixing.

[0039] The storage component 8 includes a conical sleeve 12, on which a limiting block 11 is fixedly connected. A storage cup 10 is fixedly mounted on the upper end of the limiting block 11. The material to be stirred is placed in the storage cup 10, and then the storage cup 10 is inserted into the control unit 16 through the limiting block 11 and the conical sleeve 12. At this time, the docking rod 24 is inserted into the conical sleeve 12. When the ball block 5 needs to be rotated separately, the stepper motor 30 is driven to control the rotation of the rotating guide plate 27, and the output rod on the side block 20 is limited to rotate by the rotating shaft 29. At this time, the rotating guide plate 27 is at the limit plate. The rotating guide plate 27 drives the rotating block 22 to rotate, causing the magnetic block 23 to rotate as well. At this time, the rotating block 22 rotates within the collar 25. The rotation of the magnetic block 23 can drive the stir bar 6 to rotate as well, so that the stir bar 6 rotates at the lower end of the electric telescopic rod 4 through the ball block 5. The telescopic adjustment frame 3 can adjust the position of the electric telescopic rod 4, the ball block 5, and the stir bar 6 laterally. The electric telescopic rod 4 can control the ball block 5 and the stir bar 6 to adjust their vertical position, so that the stir bar 6 changes its height. Under the action of the magnetic block 23, the stir bar 6 rotates within the storage cup 10 to achieve the purpose of mixing and stirring.

[0040] The control component 9 includes a limit control mechanism 13 and a power guide mechanism 14. The upper end of the power guide mechanism 14 is fixedly connected to the limit control mechanism 13. The limit control mechanism 13 includes a limiting unit 15 and a control unit 16. The control unit 16 is rotatably provided inside the limiting unit 15.

[0041] The limiting unit 15 includes a support 21, with a side block 20 fixedly connected to the inner ring of the support 21. A spring rod 18 is fixedly mounted on the support 21, and a telescopic adjustment block 17 is telescopically connected to the spring rod 18. A contact wheel 19 is rotatably mounted at the end of the telescopic adjustment block 17. The conical sleeve block 12 can be limited by the limiting unit 15. The conical sleeve block 12 contacts the contact wheel 19, and the contact wheel 19 rotates at the lower end of the telescopic adjustment block 17. The telescopic adjustment block 17 can be telescopically adjusted by the spring rod 18, so that the conical sleeve block 12 can rotate evenly.

[0042] The control unit 16 includes a rotating block 22 and a magnetic block 23. The magnetic block 23 is located at the center of the rotating block 22. A collar 25 is sleeved on the outer side of the rotating block 22. A connecting rod 24 is fixedly connected to the collar 25. An electrically controlled telescopic rod seat 26 is fixedly installed at the front end of the center of the collar 25. The electrically controlled telescopic rod seat 26 is connected to the rotating block 22 through telescopic control. The rotating block 22 is provided with a rod groove that matches the electrically controlled telescopic rod seat 26. Through the structural setting of the cooperation structure 1, it can cooperate with the control structure 2. The user can pull out the electrically controlled telescopic rod 4, the ball block 5, and the stirrer 6 through the telescopic adjustment frame 3. At the same time, the electrically controlled telescopic rod 4 can control the ball block 5 and the stirrer 6 to descend and adjust. The support frame 7 provides bottom support for the control structure 2. The conical sleeve 12 in the storage component 8 is inserted into the connecting rod 24, and the conical sleeve 12 contacts the contact wheel 19. The limiting block 11 restricts the top of the contact wheel 19, thereby controlling whether the storage component 8 rotates.

[0043] The power guiding mechanism 14 includes a rotating guide plate 27 and a limiting top plate 28. The rotating guide plate 27 is rotatably mounted at the center of the limiting top plate 28, and a rotating shaft 29 is rotatably mounted at the lower end of the limiting top plate 28. A stepper motor 30 is fixedly mounted at the lower end of the rotating guide plate 27, and a conical protective sleeve 31 is sleeved on the outside of the stepper motor 30.

[0044] The rotating shaft 29 is used for contact with the upper output shaft of the stepper motor 30 to ensure stable output. The rotating guide plate 27 controls the rotation of the rotating block 22. When the electrically controlled telescopic rod seat 26 is fixed to the rotating block 22 through the rod body, it drives the collar 25 to rotate with the rotating block 22. The connecting rod 24 is adapted to be inserted into the conical sleeve block 12. The upper end of the conical sleeve block 12 rotates and contacts the contact wheel 19. The collar 25 is connected in the side block 20 through a bearing. The setting of the rotating block 22 facilitates the rotation of the magnetic block 23, thereby enabling the stirrer 6 to rotate. The rotating block 22 rotates within the collar 25, and an electrically controlled telescopic rod seat 26 is installed on the collar 25. The electrically controlled telescopic rod seat 26 has a telescopic rod body that can connect with the rotating block 22, so that when the rotating block 22 rotates, it drives the collar 25 to rotate, so that the storage component 8 can rotate as a whole. Thus, the rotation of the storage component 8 can be controlled according to the actual situation. The stepper motor 30 controls the rotation of the rotating block 22 through the rotating guide plate 27. The setting of the rotating shaft 29 ensures the stability of the output rod of the stepper motor 30.

[0045] The working principle is as follows: During use, the user places the material to be stirred into the storage cup 10, and then inserts the storage cup 10 into the control unit 16 through the limiting block 11 and the conical sleeve block 12. At this time, the docking rod 24 is inserted into the conical sleeve block 12. When it is necessary to rotate the ball block 5 separately, the stepper motor 30 is driven to control the rotation of the rotating guide plate 27, and the output rod on the side block 20 is limited to rotate by the rotating shaft 29. At this time, the rotating guide plate 27 rotates within the limiting top plate 28, and the rotating guide plate 27 drives the rotating block 2 2. Rotation causes the magnetic block 23 to rotate as well. At this time, the rotating block 22 rotates within the collar 25. The rotation of the magnetic block 23 can drive the stir bar 6 to rotate as well, so that the stir bar 6 rotates at the lower end of the electrically controlled telescopic rod 4 via the ball block 5. The telescopic adjustment frame 3 can adjust the position of the electrically controlled telescopic rod 4, the ball block 5, and the stir bar 6 laterally. The electrically controlled telescopic rod 4 can control the ball block 5 and the stir bar 6 to adjust their vertical position, so that the stir bar 6 changes its height. Under the action of the magnetic block 23, the stir bar 6 rotates within the storage cup 10 to achieve the purpose of mixing and stirring.

[0046] The conical sleeve 12 can be limited by the limiting unit 15. The conical sleeve 12 contacts the contact wheel 19. The contact wheel 19 rotates at the lower end of the telescopic adjustment block 17. The telescopic adjustment block 17 can be telescopically adjusted by the spring rod 18, so that the conical sleeve 12 can rotate evenly.

[0047] When the storage component 8 needs to be rotated, the electrically controlled telescopic rod seat 26 works, causing the rod to extend and connect with the rotating block 22. As the rotating block 22 rotates, the collar 25 rotates accordingly. The collar 25 drives the conical sleeve block 12 to move through the connecting rod 24. At this time, the storage cup 10 and the limiting block 11 rotate together as a whole. The stirring bar 6 can also rotate in coordination to achieve efficient mixing.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A three-dimensional magnetic stirrer, characterized in that: It includes a mating structure (1) and a control structure (2), with the control structure (2) fixedly connected to the rear end of the mating structure (1); The structure (1) is used to cooperate with the stirring work. The electric telescopic rod (4) controls the longitudinal extension and retraction adjustment of the ball block (5) and the stirrer (6). The telescopic adjustment frame (3) performs the lateral extension and retraction adjustment. The stirrer (6) is adjusted by rotating the ball block (5) at the lower end of the electric telescopic rod (4). The control structure (2) is used for rotation control. The stepper motor (30) is connected to the rotating block (22) through the rotating guide plate (27) to control the rotation of the magnetic block (23). The electric telescopic rod seat (26) is fixed to the rotating block (22) through telescopic extension. When the rotating block (22) rotates, it drives the collar (25) to rotate, thereby controlling the overall rotation of the storage component (8).

2. The magnetic stirrer for three-dimensional use according to claim 1, characterized in that: The cooperating structure (1) includes a support frame (7), and a telescopic adjustment frame (3) is fixedly provided at the upper end of the support frame (7). The telescopic adjustment frame (3) is adjusted laterally. An electrically controlled telescopic rod (4) is provided at the front end of the telescopic adjustment frame (3). A ball block (5) and a stirrer (6) are telescopically connected at the lower end of the electrically controlled telescopic rod (4). The stirrer (6) rotates at the lower end of the electrically controlled telescopic rod (4) through the ball block (5).

3. A magnetic stirrer for three-dimensional use according to claim 2, characterized in that: The control structure (2) includes a storage component (8) and a control component (9). The upper end of the control component (9) is limited by the storage component (8). The control component (9) controls whether the storage component (8) rotates by adjusting the storage component (8).

4. A three-dimensional magnetic stirrer according to claim 3, characterized in that: The storage component (8) includes a conical sleeve (12), a limiting block (11) is fixedly connected to the conical sleeve (12), and a storage cup (10) is fixedly provided at the upper end of the limiting block (11).

5. A three-dimensional magnetic stirrer according to claim 4, characterized in that: The control component (9) includes a limit control mechanism (13) and a power guide mechanism (14). The upper end of the power guide mechanism (14) is fixedly connected to the limit control mechanism (13). The limit control mechanism (13) includes a limiting unit (15) and a control unit (16). The control unit (16) is rotatably provided inside the limiting unit (15).

6. A magnetic stirrer for three-dimensional use according to claim 5, characterized in that: The limiting unit (15) includes a support (21), a side block (20) is fixedly connected to the inner ring of the support (21), a spring rod (18) is fixedly provided on the support (21), a telescopic adjustment block (17) is telescopically connected on the spring rod (18), and a contact wheel (19) is rotatably provided at the end of the telescopic adjustment block (17).

7. A magnetic stirrer for three-dimensional use according to claim 6, characterized in that: The control unit (16) includes a rotating block (22) and a magnetic block (23). The rotating block (22) has a magnetic block (23) at its center. A collar (25) is sleeved on the outer side of the rotating block (22). A connecting rod (24) is fixedly connected to the collar (25). An electrically controlled telescopic rod seat (26) is fixedly installed at the front end of the center of the collar (25). The electrically controlled telescopic rod seat (26) is connected to the rotating block (22) through telescopic control. The rotating block (22) has a rod groove that is adapted to the electrically controlled telescopic rod seat (26).

8. A magnetic stirrer for three-dimensional use according to claim 7, characterized in that: The power guiding mechanism (14) includes a rotating guide plate (27) and a limiting top plate (28). The center of the limiting top plate (28) is provided with the rotating guide plate (27), and the lower end of the limiting top plate (28) is provided with a rotating shaft (29). The lower end of the rotating guide plate (27) is fixedly installed with a stepper motor (30), and a conical sleeve (31) is sleeved on the outside of the stepper motor (30).

9. A magnetic stirrer for three-dimensional use according to claim 8, characterized in that: The rotating shaft (29) is used for contact with the upper output shaft of the stepper motor (30) to ensure stable output. The rotating guide plate (27) controls the rotating block (22) to rotate. When the electric telescopic rod seat (26) is fixed to the rotating block (22) through the rod body, it drives the collar (25) to rotate with the rotating block (22). The connecting rod (24) is adapted to the tapered sleeve (12) and the upper end of the tapered sleeve (12) rotates and contacts the contact wheel (19). The collar (25) is connected in the side block (20) through the bearing.

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