JPH0159443B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating shaft bearing device, and more particularly to a bearing device that automatically adjusts play in a bearing portion due to wear of a bearing member to ensure stable rotation of a rotating shaft.

Chemistry Plato, stirring equipment in water treatment equipment,
In equipment having a rotating shaft that is rotationally driven by a drive device such as a sedimentation device (clarifier, shaker, etc.) or a screw conveyor, the shaft end of the anti-drive device is supported by a bearing.

In particular, bearings at the end of an overhanging shaft such as a stirring shaft in a stirring device, a scraper rotating shaft in a settling device such as a clarifier, or a shaker are important for preventing deflection of the shaft end, that is, for preventing shaft vibration. Further, the above-mentioned bearing is often housed inside the equipment container. This is because when a bearing is installed outside the equipment container, a shaft seal for the rotating shaft is required, but even if such a shaft seal is provided, a complete seal cannot be achieved due to the influence of fine solid particles in the liquid inside the equipment container. This is difficult, especially due to internal liquid leakage, and depending on the installation position of the shaft seal, the shaft seal may come into contact with the gas phase instead of the liquid phase as described above. This is because internal gas leakage may cause danger, so it is necessary to prevent leakage of internal liquid or internal gas by installing the bearing internally and eliminating shaft seals as much as possible.

Figures 1 A to C are diagrams showing the structures of the stirring device, sedimentation device, and screw conveyor. In each figure, A is a drive device such as a motor, B is a coupling, C is a rotating shaft, and D is a drive device. The bearing on the side, E is the shaft seal, and F or F' is the bearing on the side opposite to the drive device.

The structure of the bearing F or F' will be explained with reference to FIG. 2, taking a foot bearing in a stirring device as an example.

That is, in FIG. 2, 1 is a rotating shaft, 2 is a sleeve fitted and fixed on the outer periphery of the shaft end, and 3 is a bearing member that slides on the outer peripheral surface of the sleeve 2 and supports the sleeve 2 freely. With the bearing bush,
It is fitted and fixed to the inner periphery of the cylindrical bearing housing 4. Reference numeral 5 designates a bearing mount for fixedly supporting the bearing housing 4 on the bottom portion 6 of the stirring device main body.

In such a bearing device, foreign matter such as fine solid particles contained in the internal liquid of the stirring device body enters the sliding contact surface between the outer circumferential surface of the sleeve 2 and the inner circumferential surface of the bearing bushing 3, and the inner circumferential surface of the bearing bushing 3 is damaged. gradually wears out, and a gap is created in the sliding contact surface, resulting in the following problems.

In other words, the deflection of the shaft end caused by the play at the shaft end and the unbalanced load applied to the shaft as described above is related to the critical speed of the shaft system, and as a result, the shaft vibrates violently. .

The vibrations cause damage to the gears of the drive unit, the packing of the shaft seal, the labyrinth packing, the mechanical seal, etc.

In particular, in chemical Plato equipment such as stirring devices, it may cause damage to the rotating shaft and bearings, and there is a risk of unexpected accidents such as dangerous internal liquid or gas leaking from the shaft seal. be.

In order to solve these problems, the
A technique disclosed in Japanese Patent No. 45-37083 is known.

In this technique, a spring is interposed between the end of the sleeve that carries and supports the bearing device, and the elastic force of the spring presses the bearing device against the tapered surface of the end of the shaft. This system automatically compensates for wear and tear on the contact surface.

However, such conventional devices provide a solution when foreign matter gets into the sliding contact surface between the shaft and the bearing, causing the bearing to gradually wear out and creating a play in the sliding contact surface. It is not possible to know the amount of wear at that time, and it is not possible to know in advance the bearing life and maintenance inspection timing.

In addition, as shown in Japanese Utility Model Publication No. 29-2593, in order to detect the amount of wear on a bearing, the amount of movement of the rotating shaft due to wear of the bearing is detected. There is a configuration in which the amount of movement of the rotation axis can be determined by visually observing an image of light from a light source that changes accordingly.

However, in this case, for example, in the case of a bearing device in which the rotating shaft is disposed only inside the device body, or the above-mentioned wear and tear on the contact surface is actually compensated for, the rotating shaft is configured to not move. In the case of a bearing device, the amount of wear on the bearing member cannot be known. moreover,
When visually observing a very small amount of movement of the rotating shaft,
There is a high possibility of misjudgment, and the disadvantage is that the amount of wear cannot be determined reliably and accurately.

Therefore, in view of the conventional circumstances as described above, the present invention provides a tapered surface that forms the outer peripheral surface shape of a truncated cone on the sliding contact surface of the bearing member and the sleeve provided on the rotating shaft. , the construction that constantly presses and biases at least one of the sleeve and the bearing member in the direction of sliding contact with the other party eliminates the play in the bearing part due to wear of the bearing member, and the generated play is caused by the play. In addition, it is equipped with a configuration that detects the amount of wear using the amount of pressure movement of the bearing or sleeve, thereby improving maintenance and inspection of the bearing member and extending the life of the bearing member. In particular, even in the case of a bearing device in which the rotating shaft is disposed only within the equipment body, the amount of wear on the bearing member can be known, and the amount of wear can be determined reliably and accurately. It provides equipment.

Embodiments of the present invention will be described below with reference to FIGS. 3 to 7.

In FIG. 3, reference numeral 12 denotes a cylindrical sleeve that is pivotally attached to the lower end of the rotating shaft (not shown). It is fixed by a bolt (not shown) screwed into the rotating shaft via a nut member (not shown). Reference numeral 40 denotes a bearing member that slides on the inner circumferential surface of the sleeve 12 and supports the sleeve 12 in a freely rotatable manner. The sliding surfaces between the inner circumferential surface of the sleeve 12 and the outer circumferential surface of the bearing member 40 are tapered surfaces 12a and 4 having a truncated conical outer circumferential shape that tapers upward.
It is formed at 0a.

In this embodiment, the material of the sleeve 12 is mainly a metal material whose surface hardening is applied to the tapered surface 12a that comes into sliding contact, and the material of the bearing member 40 is a copper alloy, an aluminum alloy, or a synthetic resin material.
It is not particularly limited.

Further, a pressurizing device that supports the bearing member 40 so as to be movable in the axial direction and always presses the bearing member 40 in a direction in which it comes into sliding contact with the sleeve 12 is not provided. That is, 41 is a cylindrical bearing housing with a bottom, which is provided on the outer periphery of the bearing member 40 and serves as a support member for supporting the bearing member 40. The bearing member 40 is fitted into the inner peripheral portion of the bearing housing 41 so as to be slidable in the axial direction.

A key groove (not shown) is formed in the outer circumferential surface of the bearing member 40 in the vertical direction, and the head of a set screw (not shown) screwed into the peripheral wall of the bearing housing 41 is inserted into the key groove. 40 rotation is stopped. Also, although not shown, a slip key may be used instead of the female thread at the end of the rod. 13
is the inner peripheral surface of the upper end of the bearing housing 41 and the bearing member 4
This is an O-ring as a sealing member interposed in the sliding contact surface with the outer peripheral surface.

A sealed pressure chamber H is formed between the lower end surface of the bearing member 40 and the inner space of the bearing housing 41, and the tip pressurized fluid supply port 42a is connected to the pressure chamber H.
The pressure chamber H is pressurized by supplying pressurized air from a pressurized air supply circuit 57 as shown in FIG. It is configured to press the bearing member 40 in the direction of the sleeve 12.

In the pressurized air supply circuit 57, 57a is a pressurized air source equipped with an air compressor or the like;
b is a pressure regulating valve, 57c is a check valve, 57d is a relief valve, and 57e is a pressure gauge, and such pressurized air supply circuit 57 constantly supplies pressurized air to the pressure chamber H. Ru.

Note that the pressurized air source in the above embodiments may be taken out from the air system attached to the equipment, and in addition to air, an inert gas such as N ₂ gas may be used.

In the above embodiment, air was used as the pressurized fluid in the pressure chamber H, but a liquid common to the internal liquid of the device powder may be used as the pressurized fluid. In this case, as shown in Fig. 5, a tank 58 containing a liquid common to the internal liquid of the device is interposed between the pressurized air supply circuit and the pressure chamber H to convert pressurized air pressure into liquid pressure. between pressure chambers
Apply extreme pressure to the When a common liquid as a pressurized fluid has many fine solid particles in the internal liquid such as slurry, the liquid from which the fine solid particles have been removed is used.

In such a configuration, when rotational driving force is transmitted to the rotating shaft from a driving device such as a motor (not shown),
The rotating shaft is rotated while being supported by a bearing member 40 via the sleeve 12.

Here, foreign matter such as fine solid particles contained inside the device main body is removed from the lower end surface of the sleeve 12 and the bearing member 40.
It gets caught in the boundary between the sleeve 12 and the bearing member 40 and enters the sliding contact surface between the sleeve 12 and the bearing member 40.
Therefore, the tapered surface 40a on the outer periphery of the bearing member 40 gradually wears out.

However, according to the bearing device configured as described above, since the bearing member 40 is urged upward by pressurized air, the tapered surface 40a on the outer periphery of the bearing member 40
Even if wear occurs, the bearing member 40 will be damaged by the amount of wear.
slides upward within the bearing housing 41, and the tapered surface 40a forms the tapered surface 12 on the inner circumference of the sleeve 12.
Since both the tapered surfaces 12a and 40a maintain their state by being pressed by the contact point a, no play is generated between the two tapered surfaces 12a and 45a.

In the above bearing device, the present invention further includes a wear amount detection device 43 that detects the amount of movement of the bearing member 40 that is pressed and moved, and detects the amount of wear on the tapered surface 40a on the outer periphery of the bearing member 40.

This wear amount detection device 43 is configured to electrically detect and notify by a detection circuit that the bearing member 40 that is pressed and moved has moved by a predetermined amount due to wear.

That is, in the figure, 44 and 45 indicate the bearing housing 41.
A pair of contacts of a detection circuit as shown in FIG.
The tip portion is arranged to protrude into a groove 48 provided on the outer periphery of the bearing member 40. 49 is contact point 44, 45
The power lead wires connected to each other extend from the outside of the equipment container to the outside of the bearing housing 41, and further extend into the recess 47 through the inside of the wall of the bearing housing 41.

50 connects the contacts 44 and 45 to form a sixth
This is a metal ring that is used to close the detection circuit shown in the figure, that is, to constitute an energizing path for the contact, and is fitted into the groove 48 on the outer periphery of the bearing member 40, and the outer periphery of the metal ring 50 is the outer periphery of the bearing member 40. It is attached so that it is exposed on the same surface as the

In FIG. 6, reference numeral 51 indicates an alarm device such as a buzzer or a lamp connected to the power lead wire 49 connected to the contact point 44.

Therefore, when the bearing member 40 moves upward by a predetermined distance due to wear of the bearing member 40, the metal ring 50 comes into contact with both contacts 44 and 45, thereby closing the detection circuit shown in FIG. Alternatively, an alarm 51 such as a lamp is turned on to notify that the bearing member 40 has worn out a predetermined amount.

If the mounting positions of the metal ring 50 and the contacts 44, 45 are set in accordance with the amount of wear that is desired to be known in advance, it is possible to automatically notify the user when it is time to replace the bearing member 40.

The energizing path for the contact in the above configuration is not limited to the metal ring 50 as in the embodiment, but for example,
The bearing member 40 may be configured by a rod-shaped member that connects the inside of the bearing member 40 linearly.

In addition, if the bearing member 40 is made of conductive material such as a copper alloy, the bearing member 40 can of course be used as a conductive path for the contact, but in that case, the bearing member 40 may be It is necessary to prevent the contact point from coming into contact with the bearing member 40 to a position corresponding to the amount of wear that is desired to be known in advance, such as by digging a groove.

The embodiment shown above shows an example in which the present invention is applied to a bearing device having a structure in which the inner circumferential surface of the sleeve and the outer circumferential surface of the bearing member are in sliding contact, but the outer circumferential surface of the sleeve and the inner circumferential surface of the bearing member are in sliding contact. It may also be applied to structural bearing devices.

This embodiment is shown in FIGS. 7A and 7B. In the case of FIG. 7A, a sleeve 60 fitted and fixed to the outer periphery of the tip end of the rotating shaft 11 is fitted into the inner periphery of the cylindrical bearing member 61. The sliding contact surface between the outer circumferential surface of the sleeve 60 and the inner circumferential surface of the bearing member 61 is a tapered surface in the shape of a truncated conical outer circumferential surface that expands upward.

As a pressurizing device, a compression spring 6
The bearing member, which is slidably supported by the bearing housing 62, is always pressed in a direction in which it is brought into sliding contact with the sleeve 60 by using the elastic force of No. 3.

In this embodiment, the slurry and the like that have entered the sliding surface enter the space C of the bearing member 61, and from there, the slurry and the like enter the bearing housing 6 through the slurry discharge port 64.
The slurry is further efficiently discharged to the internal space E of the device main body via the slurry discharge port 65.

The embodiment shown in FIG. 7B has a structure in which the sleeve side is pressed against the bearing member side, and the sleeve 70 is formed in a cylindrical shape with a closed end, and the rotating shaft 70 is
1. It is slidably inserted into the outer periphery of the tip. The sleeve 70 is connected to the inner surface of the tip end of the sleeve 70 and the rotating shaft 1.
1 compression spring 73 interposed between the tip end surface
As a result, the tapered surface on the outer circumference is always pressed against the tapered surface on the inner circumference of the bearing member 71 and is biased in the direction of sliding contact. In this case, the bearing member 71 is fixed within the bearing housing 72. In this example,
Fluid movement hole 74 formed at the tip of the sleeve 70
is for removing air from the inner space F of the sleeve 70 and rotating shaft 1 when the sleeve 70 is assembled to the rotating shaft 11.
This is to allow fluid movement in the space F to allow vertical expansion of the sleeve 70 due to slight shaft vibration when the shaft rotates. In addition, Fig. 7A,
In the embodiment shown in B, a space K is airtightly formed by the support member 24, the bearing mount 21', and the bottom part 22' of the equipment body, and the slurry etc. accumulated in the bottom part 22' of the equipment body is removed from the equipment in the space K. Main body bottom 22'
It may be discharged by a drain valve (not shown) provided in the space K, or a fluid such as air or inert gas may be sent to the space K to maintain the pressure slightly higher than the internal pressure of the device body. do not have.

In the present invention, a wear amount detection device as shown in FIG. 3 may be applied to each of the bearing devices as described above.

As explained above, according to the present invention, the sliding contact surface between the sleeve on the rotating shaft side and the bearing member is formed into a tapered surface having a truncated conical outer circumferential shape, and at least one of the sleeve or the bearing member is Due to the configuration provided with a pressure device that presses the member in the direction of sliding contact with the other side and constantly brings the tapered surfaces into sliding contact with each other, even if the bearing member wears out, there is no play between the bearing member and the sleeve. It is possible to prevent shaft runout of the rotating shaft and achieve stable rotation of the shaft, and also to effectively prevent leakage of the internal fluid of the equipment from the shaft seal caused by the shaft runout. Safety can be increased if dangerous materials are used. Further, due to the above-described effects, even if the bearing member is worn out, its function can be maintained, so that the life of the bearing member can be extended.

In particular, the present invention is configured to detect the amount of wear of the bearing member by detecting the amount of movement of the sleeve or bearing member that is pressed and moved due to wear, so the amount of wear can be easily confirmed, and the bearing member You can know the lifespan and maintenance/inspection timing in advance, which in turn improves bearing life and maintenance/inspection workability.
It is ideal for internal bearing devices that require troublesome maintenance and inspection.In this case, the shaft seal of the rotating shaft can be made unnecessary, reducing the risk of fluid leakage inside the device due to the shaft seal. The advantage is that it can be prevented as much as possible.

Further, the wear amount detection device according to the present invention includes at least one pair of contacts of a detection circuit fixed to a support member that movably supports a member to be pressed and moved, and a power source of the detection circuit connected to each of the pair of contacts. It is composed of a lead wire and an energizing path for the contact that is attached to a member that is pressed and moved, and when the bearing member is moved due to wear, the pair of contacts contact the energizing path for the contact, thereby causing the contact to energize. Since the configuration is such that the detection circuit is activated, for example, even in a bearing device where the rotating shaft is installed only inside the equipment body, the wear of the bearing member due to the activation of the detection circuit installed outside the equipment body can be avoided. In addition to being able to easily determine the amount of wear, there is no need to visually observe the very small amount of movement of the bearing member or sleeve due to wear of the bearing member, and the amount of wear can be determined reliably and accurately.

[Brief explanation of drawings]

Figures 1A to 1C are schematic diagrams showing the stirring device, sedimentation device, and screw conveyor, respectively, and Figure 2 is the same as Figure 1A.
FIG. 3 is a longitudinal sectional view showing the structure of the bearing device according to the present invention, and FIGS. 4 and 5 show a conventional example of a bearing device in a stirring device. FIG. 6 is a diagram showing a pressurized fluid supply circuit illustrating an example of its use, FIG. 6 is a diagram showing a display circuit which is an example of the wear amount detection device shown in FIG. 3, and FIG. 7 is a longitudinal sectional view showing another embodiment. be. 12,60,70...sleeve, 15,40,
61, 71... Bearing member, 12a, 40a... Tapered surface, 41, 62, 72... Bearing housing,
63, 73... Compression spring, 42... Pressurized air supply pipe, 43... Wear amount detection device, 44, 45
... Contact, 49 ... Power lead wire, 50 ... Metal ring, 51 ... Alarm, 57 ... Pressurized air supply circuit, H ... Pressure chamber.

Claims (1)

[Scope of Claims] 1. The sliding contact surface between the sleeve provided on the rotating shaft and the bearing member that freely rotatably supports the sleeve by slidingly contacting the inner peripheral surface or outer peripheral surface of the sleeve is formed into a tapered surface. At least one of the sleeve and the bearing member is configured to be movable in the axial direction, and a pressurizing device is provided that constantly presses and urges the member in the axial direction to slide into contact with the other member. at least one pair of contacts of a detection circuit fixed to a support member movably supporting a member that supports the member, and a power lead wire of the detection circuit connected to each of the pair of contacts;
an energizing path for the contacts attached to a member that is moved by pressure, and when one of the members moves due to wear of the bearing member, the pair of contacts contacts the energizing path for the contacts, thereby A bearing device characterized by being provided with a wear amount detection device that operates a detection circuit. 2. The outer peripheral surface of the sleeve is in sliding contact with the inner peripheral surface of the bearing member, and the outer peripheral shape of the sleeve is tapered,
2. The bearing device according to claim 1, wherein the inner peripheral shape of the bearing member is formed such that the diameter increases toward the tip. 3. A patent claim in which the inner circumferential surface of the sleeve and the outer circumferential surface of the bearing member are in sliding contact with each other, and the inner circumferential shape of the sleeve is formed in a shape whose diameter increases toward the tip, and the outer circumferential shape of the bearing member is formed in a tapered shape. The bearing device according to item 1. 4. Claims 1 to 3, wherein the pressurizing device is configured to apply a pressing force using a spring force.
The bearing device according to any of paragraphs. 5. The bearing device according to any one of claims 1 to 3, wherein the pressurizing device is configured to apply a pressing force using pressurized fluid.