A stirrer with replaceable ball bearings, and a tool for removing the ball bearings from the stirrer.

Abstract

To solve the problem that in a conventional agitator, the size of a machine body is increased, and it requires much time and labor for bear replacement work.SOLUTION: An agitator includes a frame, a motor part which is provided above the frame and has a suspended motor shaft extending in the frame, a bearing provided in the frame, an agitation shaft which is rotatably supported by the bearing, extends downward from inside to outside of the frame and is suspended, agitation means provided on the agitation shaft, and a shaft joint which is provided in the frame and connects the motor shaft and the agitation shaft, wherein the shaft joint is a two vertically split coupling. A jig for removing a bearing from an agitator comprises bearing elevating means, and agitation shaft elevation prevention means.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a stirrer, particularly a stirrer in which the rotation shaft of a motor and the stirring shaft are connected using a shaft coupling (coupling).

Background Art

[0002] For example, in order to stir the contents in a large processing tank, a stirrer having a rotating long shaft with a stirring blade fixed to the lower end may be attached to the upper part of the large processing tank and used.

[0003] Since the bearing that rotatably supports the rotating long shaft of such a stirrer is a consumable part, it needs to be replaced regularly, for example, every two years.

[0004] (1. Description of a conventional stirrer)

[0005] FIG. 6 shows a conventional stirrer. 1 is, for example, a vertically installed cylindrical main body frame, 2 is a motor unit fixed to the upper end of the cylindrical main body frame 1, 3 is a motor shaft of the motor unit 2 that extends downward through the ceiling plate 1a of the cylindrical main body frame 1, 4 is a vertically installed stirring shaft that extends downward through the through hole 1c of the bottom plate 1b of the cylindrical main body frame 1, and stirring means such as a stirring blade (not shown) is provided at the lower part of the stirring shaft 4.

[0006] Also, 5 is a ball bearing that rotatably supports the stirring shaft 4 with respect to the cylindrical main body frame 1, and 6 is a shaft coupling (coupling) that connects the motor shaft 3 and the stirring shaft 4.

[0007] Furthermore, the shaft coupling 6 consists of an intermediate shaft 6a and an upper flange 6b and a lower flange 6c fixed to the upper and lower ends of the intermediate shaft 6a, respectively. The lower flange 3a, fixed to the lower end of the motor shaft 3, and the upper flange 6b of the intermediate shaft 6a are connected by bolts 7. The upper flange 4a, fixed to the upper end of the stirring shaft 4, and the lower flange 6c of the intermediate shaft 6b are also connected by bolts 7, thereby connecting the motor shaft 3 and the stirring shaft 4.

[0008] Furthermore, 8 is, for example, an opening formed on the front of the cylindrical main frame 1, and the intermediate shaft 6a can be attached to and detached from the motor shaft 3 and the stirring shaft 4 using this opening 8.

[0009] Furthermore, only the outer ring 5a portion of the ball bearing 5 is fitted from above into a recess 9 formed around the through hole 1c on the upper surface of the bottom plate 1b of the cylindrical main frame 1 and fixed in place, and the stirring shaft 4, which is press-fitted and fixed into the inner ring 5b of the ball bearing 5, is rotatably supported with respect to the cylindrical main frame 1.

[0010] Furthermore, the outer diameter of the stirring shaft 4 is formed such that the diameter of the portion above the portion in which the ball bearing 5 is press-fitted is smaller than the diameter of the portion in which the ball bearing 5 is press-fitted, so that the press-fitted ball bearing 5 can be easily removed by moving it upward.

[0011] Next, a method for replacing the ball bearings of the conventional agitator will be described.

[0012] In replacing the ball bearing, first, the bolts 7 are removed from the motor shaft 3 and the stirring shaft 4, and the connection of the intermediate shaft 6a is released.

[0013] Furthermore, the upper flange 4a is removed from the stirring shaft 4 so that the ball bearing 5 can be removed from the stirring shaft 4.

[0014] Furthermore, in order to prevent the stirring shaft 4 from falling off the cylindrical main frame 1 when the ball bearing 5 is removed from the stirring shaft 4, the stirring shaft 4 is suspended by a crane or the like, and the ball bearing 5, which is press-fitted onto the stirring shaft 4, is moved upward and removed from the stirring shaft 4.

[0015] Then, a new ball bearing, heated by a bearing warmer or the like, is pressed into the stirring shaft 4, cooled, and fixed in place, so that the stirring shaft 4 is rotatably supported on the cylindrical main frame 1 by the ball bearing 5.

[0016] Then, the removed intermediate shaft 6a is used to connect the motor shaft 3 and the stirring shaft 4.

[0017] In the conventional agitator described above, the motor shaft 3 and the agitation shaft 4 are connected using an intermediate shaft 6a. Therefore, when replacing the ball bearings, the intermediate shaft 6a can be removed to replace the ball bearings.

[0018] Therefore, when replacing the ball bearings, it is not necessary to remove the agitator itself from the large processing tank, which improves both cost-effectiveness and safety.

[0019] An example of such a stirrer is shown in Figure 3 of Patent Document 1. [Prior art documents] [Patent Documents]

[0020] [Patent Document 1] Announcement and Gazette No. 5-37696, Figure 3 [Overview of the Initiative] [Problems that the invention aims to solve]

[0021] However, in the conventional agitator, a space for fastening the upper and lower bolts 7 connecting the intermediate shaft is required, resulting in a large-sized machine body, and accordingly, there is a drawback that the vibration also increases.

[0022] Also, when removing the intermediate shaft 6a, it is necessary to separate the motor shaft 3 and the stirring shaft 4, and means for such separation is required.

[0023] Also, when replacing the ball bearing, it is necessary to suspend it with a crane or the like so that the stirring shaft 4 does not fall off from the cylindrical main body frame 1, and it is difficult to remove the ball bearing press-fitted from the agitator, etc., resulting in poor replaceability.

[0024] Also, in the invention of FIG. 1 of Patent Document 1, in order to remove the drive unit A, it is necessary to raise the shaft portion of the drive unit A, and a space and mechanism therefor are required. Also, it has a suspension mechanism such as a winch, the structure becomes complicated, and the number of parts increases, resulting in a high cost.

[0025] The present invention eliminates the above-mentioned drawbacks.

Means for Solving the Problems

[0026] To achieve the above object, the agitator of the present invention ball bearings comprises A cylindrical body mounted on top of a processing tank for stirring the contents, with an opening on the front for removing the shaft coupling. a frame, and a motor unit provided at the upper part of the frame, in which a vertically provided motor shaft extends into the frame, Cylindrical body a bearing, and a vertically provided The outer ring is fitted from above into a recess formed around the through hole in the bottom plate on the upper surface of the bottom plate of the cylindrical main frame, and when replacing the ball bearing, the balls are movable upward relative to the bottom plate. stirring shaft that extends downward from the inside to the outside of the frame, and stirring means provided on the stirring shaft, and a shaft coupling provided in the frame for connecting the motor shaft and the stirring shaft. The shaft coupling is composed of two split couplings ball bearing The cylindrical body, which is press-fitted and fixed into the inner ring, allows the ball bearing to be moved upward and removed from the upper end when the ball bearing needs replacing. and is characterized in that. Rotatable stirring shaft The contents of the processing tank are stirred. and is characterized in that it is composed of two split couplings. The two-part split coupling consists of a pair of semi-cylindrical bodies and a bolt connecting the pair of semi-cylindrical bodies. The two-part split coupling is configured to connect the motor shaft and the stirring shaft by combining the pair of semi-cylindrical bodies into a cylindrical shape and sandwiching the motor shaft and the stirring shaft. When replacing the ball bearings, the two-part split coupling can be removed from the motor shaft and the stirring shaft through the opening.

[0027] Furthermore, the stirring shaft, Cylindrical body frame above The stirring shaft support means is movable between a first position where it is not placed and a second position where it is placed on the cylindrical main frame. The stirring shaft support means comprises a stepped portion formed in the through hole of the bottom plate of the cylindrical main frame, such that the diameter of the upper hole is larger than the diameter of the lower hole; a cylindrical shaft support collar that is screwed into a threaded portion formed on the outer circumference of the stirring shaft below the ball bearing, and is movable up and down by rotation and fixed to the stirring shaft; and a flange portion formed on the outer circumference of the shaft support collar, located inside the upper hole, with a diameter larger than the diameter of the lower hole and smaller than the diameter of the upper hole. Except when replacing the ball bearing, the flange portion is positioned above the stepped portion so that it does not contact the through hole. When installing or removing the ball bearing, it moves downward until it contacts the stepped portion, and is configured to prevent the stirring shaft from falling off the frame even after the ball bearing has been removed from the stirring shaft. It is characterized by the following.

[0028] Furthermore, the present invention ball bearings From the agitator ball The tool for removing the bearing is, A cylindrical body mounted on top of a processing tank for stirring the contents, with an opening on the front for removing the shaft coupling. Frame and, Applicable Cylindrical body A motor section is provided at the top of the frame, with a vertically mounted motor shaft extending into the frame, The outer ring, The aforementioned Cylindrical body Top surface of the frame's bottom plate around the through hole in the bottom plate A recess formed therein was fitted from above. When replacing the ball bearings, the balls that can move upward relative to the bottom plate are used. A bearing and a ball bearing that is press-fitted and fixed into the inner ring of the ball bearing, When replacing the ball bearing, move the ball bearing upward and remove it from the upper end. The aforementioned Cylindrical body A vertically installed structure that extends downward from the inside to the outside of the frame. Rotatable A stirring shaft and a device attached to the stirring shaft The contents of the processing tank are stirred. stirring means and , a replaceable ball bearing comprising a shaft coupling connecting the motor shaft and the stirring shaft, provided within the cylindrical main frame. Installed in the agitator, The ball bearing raises the ball relative to the stirring shaft. Bearing lifting means and The stirring shaft prevents it from rising relative to the cylindrical main frame. The means for preventing the stirring shaft from rising, ball The bearing lifting means is the bottom plate, the ball A through-hole extending vertically is formed at a position corresponding to the bearing, and the part inserted into the screw hole from below, ball The means for preventing the stirring shaft from rising is characterized by comprising a screw capable of pressing a bearing, and a connecting means for connecting the stirring shaft and the cylindrical main frame. [Effects of the Invention]

[0029] According to the present invention, since the stirring shaft and the motor shaft are connected by a two-part vertical coupling, a large workspace is not required, and the number of complex mechanisms and parts can be reduced, thus solving the problems of conventional machines being large and costly.

[0030] Furthermore, by using the jig of the present invention, bearings can be easily removed.

[0031] Furthermore, since the bearings can be easily replaced while the unit is still installed, it becomes possible to achieve low costs in terms of both space and price.

[0032] Also, for example, it becomes possible to complete the task in a few hours with two people. [Brief explanation of the drawing]

[0033] [Figure 1] This is a longitudinal cross-sectional side view of the agitator of the present invention. [Figure 2] This is a longitudinal cross-sectional side view illustrating the bearing replacement process for the agitator of the present invention. [Figure 3] This is a longitudinal cross-sectional side view illustrating the bearing replacement process for the agitator of the present invention. [Figure 4] This is a cross-sectional plan view illustrating the bearing replacement process for the agitator of the present invention. [Figure 5] This is a longitudinal cross-sectional side view illustrating the bearing replacement process for the agitator of the present invention. [Figure 6] This is a longitudinal cross-sectional side view of a conventional agitator. [Modes for carrying out the invention]

[0034] Examples of embodiments for carrying out the present invention are shown below. [Examples]

[0035] Embodiment 1 of the present invention will be explained with reference to Figures 1 to 5.

[0036] (2. Explanation of the two-part longitudinal coupling)

[0037] In this invention, instead of connecting the motor shaft 3 and the stirring shaft 4 by an intermediate shaft 6a, as in the conventional agitator, they are connected by a two-part vertically split cylindrical coupling 10, as shown in Figures 1 and 2.

[0038] The two vertically split cylindrical coupling 10 consists of a pair of semi-cylindrical bodies 10a, 10a, a bolt 10b for fixing the pair of semi-cylindrical bodies 10a, 10a assembled into a cylindrical shape, and protrusions (not shown) provided on the inner circumferential surface of the semi-cylindrical body 10a that engage with recesses 3b, 4b formed on the motor shaft 3 and the stirring shaft 4, respectively.

[0039] Then, the pair of semi-cylindrical bodies 10a, 10a are combined into a cylindrical shape to sandwich the motor shaft 3 and the stirring shaft 4, and the protrusions are engaged with the recesses 3b, 4b. The pair of semi-cylindrical bodies 10a, 10a are then fastened together with the bolts 10b, thereby connecting the motor shaft 3 and the stirring shaft 4.

[0040] Furthermore, to facilitate the tightening and loosening of the bolts 10b, openings 8, 8 are provided on the front and back of the cylindrical main frame 1, for example.

[0041] By using the two vertically split cylindrical coupling 10 of the present invention, removal from the stirring shaft 4 and motor shaft 3 becomes easier compared to when using the conventional intermediate shaft 6a, and the installation and removal space can be reduced, making the cylindrical main frame 1 more compact.

[0042] (3. Description of the stirring shaft support means)

[0043] Furthermore, in the agitator of the present invention, in order to prevent the agitator shaft 4 from falling off the cylindrical main frame 1 when the ball bearing 5 that rotatably supports the agitator shaft 4 on the cylindrical main frame 1 is removed from the agitator shaft 4, the agitator shaft 4 is provided with a movable agitator shaft support means 11 that can be positioned in a first position where it is not placed on the cylindrical main frame 1 and a second position where it is placed on the cylindrical frame 1.

[0044] The stirring shaft support means 11, for example as shown in Figures 2 and 3, consists of a stepped portion 1f formed in the through hole 1c of the bottom plate 1b such that the diameter of the upper hole 1e is larger than the diameter of the lower hole 1d; a cylindrical shaft support collar 12 that is screwed onto a threaded portion (not shown) formed on the outer circumferential surface of the stirring shaft 4 below the ball bearing 5 and fixed to the stirring shaft 4 so as to be able to move up and down by rotation; and a flange portion 13 formed on the outer circumferential surface of the shaft support collar 12, located within the upper hole 1e, with a diameter larger than the diameter of the lower hole 1d and smaller than the diameter of the upper hole 1e.

[0045] Furthermore, when not replacing the ball bearing, the flange portion 13 is positioned above the stepped portion 1f so that it does not come into contact with the through hole 1c. Also, when installing or removing the ball bearing, it moves downward until it comes into contact with the stepped portion 1f, so that even after the ball bearing 5 has been removed from the stirring shaft 4, the stirring shaft 4 does not fall off the cylindrical main frame 1.

[0046] Alternatively, a radially extending through-hole 12a may be provided on the outer circumference of the shaft support collar 12, and a screw (not shown) may be screwed into the screw hole 12a to securely fix the shaft support collar 12 to the stirring shaft 4.

[0047] In this invention, since the stirring shaft support means 11 is provided, the ball bearing 5 can be removed without suspending the stirring shaft 4 with a crane or the like.

[0048] (4. Description of the specialized jig for removing ball bearings)

[0049] Furthermore, a special jig for removing ball bearings is used to remove the ball bearings 5 ​​from the stirring shaft 4.

[0050] The dedicated jig comprises a ball bearing lifting means for moving the ball bearing 5 upward relative to the stirring shaft 4, and a stirring shaft lifting prevention means for preventing the stirring shaft 4 from rising relative to the cylindrical main frame 1.

[0051] As shown in Figures 3 to 5, the ball bearing lifting means consists of, for example, a vertically extending through screw hole 14 formed in the recess 9 formed in the bottom plate 1b, and a screw 15 inserted into the screw hole 14 from below. The screw 15 is screwed into the screw hole 14, and the tip of the screw 15 protrudes from the upper surface of the recess 9, pressing against the outer ring 5a of the ball bearing 5, thereby lifting the ball bearing 5.

[0052] Furthermore, the means for preventing the stirring shaft from rising consists of means for connecting the stirring shaft and the cylindrical main frame, and for example, it consists of a rectangular plate 16 fixed to the upper end of the stirring shaft 4 by screws or the like, a bolt 17 extending downward through holes 16a provided at the four corners of the rectangular plate 16, and a screw hole 18 formed on the upper surface of the floor plate 1b of the cylindrical main frame 1 into which the tip of the bolt 17 is screwed, and by tightening the head of the bolt 17, the stirring shaft 4 is fixed to the cylindrical main frame 1 via the rectangular plate 16.

[0053] Then, in order to remove the press-fitted ball bearing 5 from the stirring shaft 4, the screw 15 is rotated, and as shown in Figure 5, the tip of the screw 15 presses the ball bearing upward. At this time, the stirring shaft 4 is prevented from moving upward by the stirring shaft upward restraining means, so only the ball bearing 5 rises, and as it rises to the part of the stirring shaft 4 where the diameter narrows, the ball bearing 5 can be removed from the upper end of the stirring shaft 4.

[0054] When removing the ball bearing 5 from the stirring shaft 4, the rectangular plate portion 16 should be removed.

[0055] In this invention, the ball bearing can be easily removed by using a dedicated jig.

[0056] (5. Explanation of ball bearing replacement)

[0057] After removing the ball bearing from the stirring shaft, a new ball bearing 5, heated by a bearing warmer or the like, is inserted from the upper end of the stirring shaft 4, pressed into place at the desired position, and then cooled to fix the ball bearing 5 to the stirring shaft 4.

[0058] Then, after the ball bearing 5 is fixed to the stirring shaft 4, the collar 12 is rotated and raised to a position where the flange portion 13 does not come into contact with the hole 1c, so that the stirring shaft 4 is supported by the cylindrical main frame 1 solely by the ball bearing 5.

[0059] Then, the two vertically split couplings 10 are placed over the stirring shaft 4 and the motor shaft 3 and fastened with the bolts 10b to connect the stirring shaft 4 and the motor shaft 3. [Explanation of symbols]

[0060] 1. Cylindrical main frame 1a Ceiling panel 1b Bottom plate 1c through hole 1d lower hole 1e Upper hole 1st floor step 2. Motor section 3 Motor shafts 3a Lower flange 3b recess 4. Stirring shaft 4a Upper flange 4b recess 5 ball bearings 5a Outer ring 5b Inner ring 6-axis coupling 6a Intermediate shaft 6b Upper flange 6c Lower flange 7 volts 8 openings 9 recesses 10. Two vertically split cylindrical couplings 10a half cylinder 10b bolt 11 Stirring shaft support means 12 Shaft support collar 12a Screw hole 13. Tsuba (guard) 14 screw holes 15 screws 16 Plate 16a hole 17 volts 18 screw holes

Claims

1. A cylindrical main body frame attached to the top of a processing tank for stirring the contents, having an opening on the front for removing the shaft coupling, A motor section is provided at the top of the cylindrical main frame, with a vertically mounted motor shaft extending into the frame, The outer ring is fitted from above into a recess formed around the through hole in the bottom plate on the upper surface of the bottom plate of the cylindrical main frame, and the ball bearing is movable upward relative to the bottom plate when the ball bearing is replaced. A vertically mounted, rotatable stirring shaft extending downward from the inside to the outside of the cylindrical main frame is press-fitted and fixed into the inner ring of the ball bearing, and when the ball bearing needs to be replaced, the ball bearing can be moved upward and removed from the upper end. The stirring shaft is provided with stirring means for stirring the contents in the processing tank, It consists of a shaft coupling provided within the frame that connects the motor shaft and the stirring shaft, The aforementioned shaft coupling is a two-part longitudinal coupling, The two-part vertical coupling consists of a pair of semi-cylindrical bodies and a bolt connecting the pair of semi-cylindrical bodies. The two-part vertical coupling is configured to connect the motor shaft and the stirring shaft by combining the pair of semi-cylindrical bodies into a cylindrical shape and sandwiching the motor shaft and the stirring shaft, and is characterized in that the two-part vertical coupling can be removed from the motor shaft and the stirring shaft through the opening when the ball bearings are replaced.

2. The stirring shaft has a stirring shaft support means that is movable between a first position where it is not placed on the cylindrical main frame and a second position where it is placed on the cylindrical main frame. The stirring shaft support means includes a stepped portion formed in the through hole of the bottom plate of the cylindrical main frame, such that the diameter of the upper hole is larger than the diameter of the lower hole, A cylindrical shaft support collar is screwed into a threaded portion formed on the outer circumferential surface of the stirring shaft below the ball bearing, allowing it to move up and down by rotation and fixed to the stirring shaft; and a flange portion is formed on the outer circumferential surface of the shaft support collar, located within the upper hole, with a diameter larger than the diameter of the lower hole and smaller than the diameter of the upper hole. Except when replacing ball bearings, the flange portion is positioned above the stepped portion and in a position where it does not come into contact with the through hole. The agitator with replaceable ball bearings according to claim 1, characterized in that when installing or removing the ball bearings, the agitator moves downward until it contacts the stepped portion, and the agitator is configured to prevent the agitator from falling off the frame even after the ball bearings have been removed from the agitator shaft.

3. A cylindrical main body frame attached to the top of a processing tank for stirring the contents, having an opening on the front for removing the shaft coupling, A motor section is provided at the top of the cylindrical main frame, with a vertically mounted motor shaft extending into the frame, The outer ring is fitted from above into a recess formed around the through hole in the bottom plate on the upper surface of the bottom plate of the cylindrical main frame, and the ball bearing is movable upward relative to the bottom plate when the ball bearing is replaced. A vertically mounted, rotatable stirring shaft extending downward from the inside to the outside of the cylindrical main frame is press-fitted and fixed into the inner ring of the ball bearing, and when the ball bearing needs to be replaced, the ball bearing can be moved upward and removed from the upper end. The stirring shaft is provided with stirring means for stirring the contents in the processing tank, A replaceable ball bearing is provided in the agitator, which is provided within the cylindrical main frame and consists of a shaft coupling connecting the motor shaft and the stirring shaft. A ball bearing lifting means for raising the ball bearing relative to the stirring shaft, The stirring shaft is prevented from rising relative to the cylindrical main frame by a means for preventing the stirring shaft from rising. The ball bearing lifting means comprises a vertically extending through-hole formed in the bottom plate at a position corresponding to the ball bearing, and a screw inserted from below into the screw hole and capable of pressing the ball bearing. A jig for removing a ball bearing from a ball bearing replaceable agitator, characterized in that the means for preventing the agitation shaft from rising comprises a connecting means for connecting the agitation shaft and the cylindrical main frame.

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