ACM rubber tube compound reaction kettle

Abstract

This invention relates to the field of reaction vessel technology and provides an ACM rubber tube compound reaction vessel, including a vessel body and a stirring structure mounted on the vessel body. The stirring structure includes a first stirring shaft, a bushing, a second stirring shaft, a first stirring component, a second stirring component, a spiral spring, and a drive mechanism. The drive mechanism includes a first stepper motor, a turntable, and a drive sleeve. The first stirring component includes a mounting sleeve, a first connecting rod, a second connecting rod, and a first compression spring. The second stirring component includes a movable sleeve, a second compression spring, and a second stirring support rod. By setting up the vessel body and stirring structure, the first stirring shaft, the second stirring shaft, the first stirring component, and the second stirring component rotate and oscillate to stir the raw materials, expanding the stirring range and angle, and improving the mixing efficiency. Furthermore, the first stirring shaft and the second stirring shaft, through differential speed, speed-increasing speed, and same-speed stirring, achieve better stirring and mixing effects.

Description

Technical Field

[0001] This invention belongs to the field of reaction vessel technology, and particularly relates to an ACM rubber tube compound reaction vessel. Background Technology

[0002] A reaction vessel is a container that carries out physical or chemical reactions. Through structural design and parameter configuration of the container, the heating, evaporation, cooling and low-to-high-speed mixing functions required by the process can be achieved. Reactors are widely used in petroleum, chemical, rubber, pesticide, dye, pharmaceutical and food industries. Reactors are generally equipped with a stirring structure to ensure that materials are fully mixed and reacted, thereby accelerating the reaction rate. The commonly used stirring method is to fix multiple stirring parts at intervals on a rotating shaft. The shaft drives the multiple stirring parts to rotate at the same speed for stirring. The gap between adjacent stirring parts makes it impossible to fully mix the raw materials between adjacent stirring parts. Moreover, at the same time, the stirring shaft can usually only stir the materials at one speed, resulting in uneven stirring. Summary of the Invention

[0003] This invention provides an ACM rubber tube compound reaction vessel, which aims to solve the above-mentioned problems.

[0004] This invention is implemented as follows: an ACM rubber tube compound reaction vessel, comprising: The vessel body; A stirring structure installed on the vessel body, the stirring structure comprising: A first stirring shaft extends from the top of the vessel body into the vessel body. A first stirring component is installed on the shaft section of the first stirring shaft located inside the vessel body. A bushing is fitted on the first stirring shaft, and the bushing is rotatably installed on the top of the vessel body. A second stirring shaft is movably inserted into the first stirring shaft from the bottom end of the first stirring shaft. A second stirring component is installed on the second stirring shaft. A spiral spring is connected between the second stirring shaft and the first stirring shaft. One end of the spiral spring is fixedly connected to the first stirring shaft, and the other end of the spiral spring is slidably connected to the second stirring shaft along its length. A groove can be opened on the second stirring shaft along its length for the other end of the spiral spring to be inserted and slidably connected. The drive mechanism installed on the top of the vessel body is used to drive the first stirring shaft to rotate and oscillate back and forth.

[0005] Preferably, the bushing is spirally connected to the first stirring shaft, and the driving mechanism includes a first stepper motor, a turntable and a driving sleeve. The first stepper motor is fixed to the top of the vessel body, and a turntable is fixed on the output shaft of the first stepper motor. A driving sleeve is eccentrically hinged to the turntable, and the driving sleeve is sleeved on the top of the first stirring shaft and rotatably connected to it.

[0006] Preferably, the first stirring component includes: A mounting sleeve is fitted onto the first stirring shaft, and two first connecting rods are hinged to the mounting sleeve; Two second connecting rods are hinged to the bottom end of the first stirring shaft. The two first connecting rods and the two second connecting rods are hinged to form a parallelogram structure. A first compression spring is sleeved on the first stirring shaft and located between the mounting sleeve and the bottom end of the first stirring shaft.

[0007] Preferably, multiple first stirring rods are hinged to the first connecting rod.

[0008] Preferably, the second stirring component includes: A movable sleeve is slidably installed along the length of the second stirring shaft, and second compression springs are fitted on both the upper and lower sides of the movable sleeve on the second stirring shaft. Multiple second stirring rods are circumferentially hinged to the movable sleeve.

[0009] Preferably, a ball is embedded in and rotatably mounted at the bottom end of the second stirring shaft, and the ball is in contact with the bottom of the reactor.

[0010] Preferably, the vessel body is mounted on a mounting base, and a plurality of graphite bodies are placed inside the vessel body. The graphite bodies have a plurality of through holes. A disc and a second stepper motor that drives the disc to rotate are mounted on the mounting base below the vessel body. An electromagnet is mounted on the disc. When the electromagnet is energized, it has a repulsive force on the graphite bodies.

[0011] Preferably, a support rod is fixed on one side of the vessel body on the mounting base, the top end of the support rod is hinged to the bottom of the vessel body, a gear is rotatably mounted on the other side of the vessel body on the mounting base, a third connecting rod is eccentrically hinged to the gear, the third connecting rod is hinged to the bottom of the vessel body, and a power component for driving the gear to rotate is mounted on the mounting base.

[0012] Preferably, the power component includes: A rack that is horizontally slidably mounted on a mounting base and located below a gear, the rack meshing with the gear; A fourth link is hinged to one end of the rack near the disk, and the fourth link is hinged to a pin that is eccentrically fixed to the upper surface of the disk.

[0013] Preferably, a mounting ring is coaxially provided above the disk, and the mounting ring is fixedly connected to the mounting base by a support rod. A flexible resistive sheet is attached to the inner wall of the mounting ring. The pin is made of conductive material and is electrically connected to the resistive sheet. A wire is connected to one end of the resistive sheet and the pin. The wire is connected in series to the electromagnet power supply line.

[0014] Compared with the prior art, the embodiments of this application have the following main advantages: The ACM rubber tube compound reactor provided by this invention features a reactor body and a stirring structure. The stirring structure includes a first stirring shaft, a bushing, a second stirring shaft, a first stirring component, a second stirring component, a spiral spring, and a drive mechanism. The drive mechanism drives the first stirring shaft to rotate and reciprocate, causing the first stirring shaft, the second stirring shaft, the first stirring component, and the second stirring component to rotate and reciprocate, thus expanding the stirring range and angle and improving mixing efficiency. Furthermore, when the first stirring shaft drives the second stirring shaft to rotate via the spiral spring, the initial speed of the second stirring shaft is lower than that of the first stirring shaft. As the spiral spring tightens, the speed of the second stirring shaft gradually increases until it reaches the same speed as the first stirring shaft. Through the combination of differential speed, speed increase, and speed equalization stirring, the mixing effect is improved. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an ACM rubber tube rubber compound reaction vessel provided by the present invention; Figure 2 yes Figure 1 Enlarged view of point A in the image; Figure 3 This is a schematic diagram of the installation of the first and second stirring shafts in an ACM rubber tube reaction vessel provided by the present invention. Figure 4 This is a schematic diagram of the installation of a spiral spring in an ACM rubber tube reaction vessel provided by the present invention; Figure 5 This is a top view schematic diagram of the power component in an ACM rubber tube reaction vessel provided by the present invention.

[0016] Figure reference numerals: 1. Mounting base; 2. Rack; 3. Gear; 4. Third connecting rod; 5. Through hole; 6. Vessel body; 7. Second stirring support rod; 8. Graphite body; 9. Second connecting rod; 10. First connecting rod; 11. First stirring support rod; 12. Bushing; 13. Turntable; 14. Drive sleeve; 15. First stirring shaft; 16. First compression spring; 17. Second compression spring; 18. Movable sleeve; 19. Second stirring shaft; 20. Support rod; 21. Mounting ring; 22. Disc; 23. Second stepper motor; 24. Electromagnet; 25. Fourth connecting rod; 26. Scroll spring; 27. Ball bearing; 28. Pin; 29. ​​Resistance element; 30. Wire. Detailed Implementation

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0018] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0019] This invention provides an ACM rubber tube compound reaction vessel, such as... Figures 1-5 As shown, it includes: The vessel body 6 is equipped with existing conventional designs such as a feed inlet and a discharge outlet, which will not be described in detail here. A stirring structure installed on the vessel body 6, the stirring structure comprising: A first stirring shaft 15 extends from the top of the vessel body 6 into the vessel body 6. A first stirring component is installed on the shaft section of the first stirring shaft 15 located inside the vessel body 6. A bushing 12 is fitted on the first stirring shaft 15. The bushing 12 is rotatably installed on the top of the vessel body 6. A second stirring shaft 19 is movably inserted into the first stirring shaft 15 from the bottom end of the first stirring shaft 15. A second stirring component is installed on the second stirring shaft 19. A spiral spring 26 is connected between the second stirring shaft 19 and the first stirring shaft 15. One end of the spiral spring 26 is fixedly connected to the first stirring shaft 15, and the other end of the spiral spring 26 is slidably connected to the second stirring shaft 19 along its length. A groove can be opened on the second stirring shaft 19 along its length to allow the other end of the spiral spring 26 to be inserted and slidably connected. The drive mechanism installed on the top of the vessel body 6 is used to drive the first stirring shaft 15 to rotate and oscillate back and forth; During operation, the drive mechanism drives the first stirring shaft 15 to rotate and oscillate back and forth. The first stirring shaft 15 drives the second stirring shaft 19 to rotate. The first stirring shaft 15 and the second stirring shaft 19 respectively drive the first stirring component and the second stirring component to rotate, thus stirring the raw materials. At the same time, the first stirring shaft 15, the second stirring shaft 19, the first stirring component, and the second stirring component oscillate back and forth, expanding the stirring range and angle, and improving the mixing efficiency. Furthermore, when the first stirring shaft 15 drives the second stirring shaft 19 to rotate through the spiral spring 26, due to the elasticity of the spiral spring 26, the speed of the second stirring shaft 19 is initially lower than the speed of the first stirring shaft 15. As the spiral spring 26 tightens, the speed of the second stirring shaft 19 gradually increases, and finally becomes the same as the speed of the first stirring shaft 15. Through the combination of differential speed, speed increase, and same speed stirring, the stirring and mixing effect is better.

[0020] The bushing 12 is spirally connected to the first stirring shaft 15. The threaded connection is similar to a self-spinning mop handle or a hand-pushed flying saucer structure. The drive mechanism includes a first stepper motor, a turntable 13, and a drive sleeve 14. The first stepper motor is fixed to the top of the vessel body 6 and can be fixed by bolts. The turntable 13 is fixed on the output shaft of the first stepper motor and can be fixed by welding. The drive sleeve 14 is eccentrically hinged on the turntable 13. The drive sleeve 14 is sleeved on the top of the first stirring shaft 15 and rotatably connected to it. It can be rotatably connected by bearings. It needs to be explained that when the first stepper motor is started, the first stepper motor drives the turntable 13 to rotate. The turntable 13 drives the drive sleeve 14 to make a circular motion. The drive sleeve 14 drives the first stirring shaft 15 to reciprocate relative to the bushing 12. Since the bushing 12 and the first stirring shaft 15 are spirally connected, the first stirring shaft 15 rotates in both directions. The first stirring shaft 15 drives the second stirring shaft 19 to rotate in both directions. Since the speed of the reciprocating motion of the first stirring shaft 15 relative to the bushing 12 is different, the first stirring shaft 15 and the second stirring shaft 19 rotate at different speeds. At the same time, when the drive sleeve 14 makes a circular motion, it drives the top of the first stirring shaft 15 to move, causing the first stirring shaft 15 to oscillate back and forth.

[0021] Specifically, the first stirring component includes: A mounting sleeve is fitted onto the first stirring shaft 15, and two first connecting rods 10 are hinged to the mounting sleeve; Two second connecting rods 9 are hinged to the bottom end of the first stirring shaft 15. The two first connecting rods 10 and the two second connecting rods 9 are hinged to form a parallelogram structure. A first compression spring 16 is sleeved on the first stirring shaft 15 and located between the mounting sleeve and the bottom end of the first stirring shaft 15; It is understandable that when the first stirring shaft 15 moves relative to the bushing 12, under the action of the first compression spring 16, it pushes the mounting sleeve to stay close to the bushing 12, so that the distance between the mounting sleeve and the bottom end of the first stirring shaft 15 changes, thereby changing the shape of the parallelogram structure formed by the first stirring rod and the second stirring rod, resulting in a larger stirring range and improved stirring efficiency. Furthermore, multiple first stirring rods 11 are hinged to the first connecting rod 10. When the first stirring shaft 15 rotates, the first stirring rods 11 will deflect under centrifugal force, gravity and resistance, thus fully stirring.

[0022] In this embodiment, the second stirring component includes: The movable sleeve 18, which is slidably installed along the length of the second stirring shaft 19, has a protrusion on its inner wall that can be inserted into the groove on the second stirring shaft 19. The second stirring shaft 19 is fitted with second compression springs 17 on both the upper and lower sides of the movable sleeve 18. Multiple second stirring rods 7 are circumferentially hinged to the movable sleeve 18; During operation, the second stirring shaft 19 drives the movable sleeve 18 to rotate, the movable sleeve 18 drives the second stirring support rod 7 to rotate, and the second stirring support rod 7 stirs the rubber material. In a specific implementation, a ball bearing 27 is embedded in and freely rotated at the bottom of the second stirring shaft 19. The ball bearing 27 contacts the bottom of the reactor, thereby reducing the friction between the second stirring shaft 19 and the bottom of the reactor. Preferably, the vessel body 6 is mounted on the mounting base 1. Multiple graphite bodies 8 are placed inside the vessel body 6, and each graphite body 8 has multiple through holes 5. The shape of the graphite body 8 can be spherical, a triangular truncated pyramid, or a cube, etc., without excessive restrictions. A disc 22 and a second stepper motor 23 that drives the disc 22 to rotate are mounted on the mounting base 1 below the vessel body 6. The second stepper motor 23 can be fixed with bolts. An electromagnet 24 is mounted on the disc 22. Because graphite has antimagnetic properties, when the electromagnet 24 is energized, it exerts a repulsive force on the graphite bodies 8, causing the graphite bodies 8 to suspend and move within the vessel body 6. The second stepper motor 23 drives the electromagnet 24 to rotate. The direction and angle of the repulsive force of the electromagnet 24 on the graphite bodies 8 change, and in conjunction with the stirring structure, the adhesive is further mixed evenly and reacted fully.

[0023] Furthermore, a support rod 20 is fixed on one side of the vessel body 6 on the mounting base 1, which can be welded and fixed. The top end of the support rod 20 is hinged to the bottom of the vessel body 6. A gear 3 is rotatably mounted on the other side of the vessel body 6 on the mounting base 1. A third connecting rod 4 is eccentrically hinged to the gear 3. The third connecting rod 4 is hinged to the bottom of the vessel body 6. A power component for driving the gear 3 to rotate is installed on the mounting base 1. When the power component drives the gear 3 to rotate, the gear 3 drives the vessel body 6 to reciprocate through the third connecting rod 4. The rubber material in the float follows the swaying, improving the mixing efficiency. The power component includes: A rack 2 is horizontally slidably mounted on the mounting base 1 and located below the gear 3. The rack 2 meshes with the gear 3 and can be slidably mounted by means of a slider and a groove. A fourth link 25 is hinged to one end of the rack 2 near the disk 22, and the fourth link 25 is hinged to a pin 28 that is eccentrically fixed to the upper surface of the disk 22. When the disk 22 rotates, it drives the rack 2 to move horizontally back and forth through the fourth connecting rod 25. The rack 2 drives the gear 3 to rotate in both directions, and the gear 3 drives the reaction vessel to shake back and forth through the third connecting rod 4. Preferably, a mounting ring 21 is coaxially provided above the disk 22. The mounting ring 21 is fixedly connected to the mounting base 1 by a support rod. A flexible resistive sheet 29 is attached to the inner wall of the mounting ring 21. The pin 28 is made of conductive material and is electrically connected to the resistive sheet 29. A wire 30 is connected to one end of the resistive sheet 29 and the pin 28. The wire 30 and the pin 28 can be electrically connected by a brush. The wire 30 is connected in series to the power supply line of the electromagnet 24. When the disc 22 rotates, it drives the pin 28 to rotate. When the pin 28 rotates, the electrical connection position between it and the resistor 29 changes, which in turn changes the resistance of the power supply line of the electromagnet 24, causing a change in the current through the electromagnet 24, which in turn changes the magnetism of the electromagnet 24, and finally changes the repulsive force on the graphite body 8, causing the graphite body 8 to move more randomly within the vessel body 6.

[0024] In summary, this invention provides an ACM rubber tube compound reaction vessel, the working principle of which is as follows: The first stepper motor is started, driving the turntable 13 to rotate. The turntable 13 drives the drive sleeve 14 to perform circular motion, which in turn drives the first stirring shaft 15 to reciprocate relative to the bushing 12. Since the bushing 12 and the first stirring shaft 15 are spirally connected, the first stirring shaft 15 rotates in both directions. The first stirring shaft 15 drives the second stirring shaft 19 to rotate in both directions. Because the speed of the first stirring shaft 15's reciprocating motion relative to the bushing 12 is variable, the first stirring shaft 15 and the second stirring shaft 19 rotate at variable speeds. Simultaneously, the drive sleeve 14... During circular motion, the top end of the first stirring shaft 15 moves, causing the first stirring shaft 15 to oscillate back and forth. The first stirring shaft 15 and the second stirring shaft 19 respectively drive the first stirring component and the second stirring component to rotate, stirring the raw materials. At the same time, the reciprocating oscillation of the first stirring shaft 15, the second stirring shaft 19, the first stirring component, and the second stirring component expands the stirring range and angle, improving mixing efficiency. Furthermore, when the first stirring shaft 15 drives the second stirring shaft 19 to rotate via the spiral spring 26, the elasticity of the spiral spring 26 causes the second stirring shaft to... The speed of the second stirring shaft 19 is less than that of the first stirring shaft 15. As the spiral spring 26 tightens, the speed of the second stirring shaft 19 gradually increases, eventually reaching the same speed as the first stirring shaft 15. Through the combination of differential speed, speed-increasing speed, and same-speed stirring, the electromagnet 24, after being energized, exerts a repulsive force on the graphite body 8, causing the graphite body 8 to suspend and move within the reactor 6. Furthermore, the second stepper motor 23 drives the electromagnet 24 to rotate. The direction and angle of the repulsive force exerted by the electromagnet 24 on the graphite body 8 change, and in conjunction with the stirring structure, further homogenizes the adhesive. When the disc 22 rotates, it drives the rack 2 to reciprocate horizontally via the fourth connecting rod 25. The rack 2 drives the gear 3 to rotate in both directions, and the gear 3 drives the reactor to sway back and forth via the third connecting rod 4. When the disc 22 rotates, it drives the pin 28 to rotate. When the pin 28 rotates, the electrical connection position with the resistor 29 changes, which causes the resistance of the power supply line of the electromagnet 24 to change, resulting in a change in the current through the electromagnet 24, which in turn causes a change in the magnetism of the electromagnet 24, and finally a change in the repulsive force on the graphite body 8, causing the graphite body 8 to move more randomly within the reactor body 6.

[0025] It should be noted that, for the sake of simplicity, the foregoing embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to the present invention. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0026] It should be understood that the disclosed apparatus can be implemented in other ways, given the several embodiments provided in this application. For example, the apparatus embodiments described above are merely illustrative; the division of units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or communication connections shown or discussed may be through some interfaces; the indirect coupling or communication connections between devices or units may be telecommunications or other forms.

[0027] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of the present invention according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of the present invention. These technical solutions also fall within the scope of protection of the present invention.

Claims

1. An ACM rubber tube compound reaction vessel, comprising: The vessel body; A stirring structure installed on the vessel body, characterized in that the stirring structure comprises: A first stirring shaft extends from the top of the vessel body into the vessel body. A first stirring component is installed on the shaft section of the first stirring shaft located inside the vessel body. A bushing is fitted on the first stirring shaft, and the bushing is rotatably installed on the top of the vessel body. A second stirring shaft is movably inserted into the first stirring shaft from the bottom end of the first stirring shaft. A second stirring component is installed on the second stirring shaft. A spiral spring is connected between the second stirring shaft and the first stirring shaft. One end of the spiral spring is fixedly connected to the first stirring shaft, and the other end of the spiral spring is slidably connected to the second stirring shaft along its length. A groove is opened on the second stirring shaft along its length for the other end of the spiral spring to be inserted and slidably connected. The drive mechanism installed on the top of the vessel body is used to drive the first stirring shaft to rotate and oscillate back and forth.

2. The ACM rubber tube compound reactor of claim 1, wherein, The bushing is spirally connected to the first stirring shaft. The driving mechanism includes a first stepper motor, a turntable, and a driving sleeve. The first stepper motor is fixed to the top of the vessel body. A turntable is fixed on the output shaft of the first stepper motor. A driving sleeve is eccentrically hinged to the turntable. The driving sleeve is sleeved on the top of the first stirring shaft and rotatably connected to it.

3. The ACM rubber tube compound reactor of claim 1, wherein, The first stirring component includes: A mounting sleeve is fitted onto the first stirring shaft, and two first connecting rods are hinged to the mounting sleeve; Two second connecting rods are hinged to the bottom end of the first stirring shaft. The two first connecting rods and the two second connecting rods are hinged to form a parallelogram structure. A first compression spring is sleeved on the first stirring shaft and located between the mounting sleeve and the bottom end of the first stirring shaft.

4. The ACM rubber tube compound reactor of claim 3, wherein, Multiple first stirring rods are hinged to the first connecting rod.

5. The ACM rubber tube compound reaction vessel as described in claim 1, characterized in that, The second stirring component includes: A movable sleeve is slidably installed along the length of the second stirring shaft, and second compression springs are fitted on both the upper and lower sides of the movable sleeve on the second stirring shaft. Multiple second stirring rods are circumferentially hinged to the movable sleeve.

6. The ACM rubber tube reaction vessel as described in claim 1, characterized in that, The bottom end of the second stirring shaft is fitted with a ball that can rotate freely, and the ball is in contact with the bottom of the reactor.

7. The ACM rubber tube reaction vessel as described in claim 1, characterized in that, The vessel body is mounted on a mounting base, and a disc and a second stepper motor that drives the disc to rotate are mounted on the mounting base below the vessel body.

8. The ACM rubber tube reaction vessel as described in claim 7, characterized in that, A support rod is fixed on one side of the vessel body on the mounting base. The top end of the support rod is hinged to the bottom of the vessel body. A gear is rotatably mounted on the other side of the vessel body on the mounting base. A third connecting rod is eccentrically hinged to the gear and is hinged to the bottom of the vessel body. A power component for driving the gear to rotate is mounted on the mounting base.

9. The ACM rubber tube reaction vessel as described in claim 8, characterized in that, The power component includes: A rack that is horizontally slidably mounted on a mounting base and located below a gear, the rack meshing with the gear; A fourth link is hinged to one end of the rack near the disk, and the fourth link is hinged to a pin that is eccentrically fixed to the upper surface of the disk.

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