Stirrer mounting structure

Abstract

To provide a stirrer mounting structure that enables easy maintenance and management of coupling between a base portion and a cap portion.SOLUTION DEVICE: Provided is a stirrer mounting structure having a boss portion 1 for supporting, on a rotating shaft 7, a stirrer 5 for stirring a to-be-stirred material in a stirring container, wherein a rotary engagement portion 15 is provided between the rotating shaft 7 and the boss portion 1, which engages in the rotary direction to stop the rotation between the rotating shaft 7 and the boss portion 1. The boss portion 1 has a base portion 21 and a cap portion 23 that are disassembled into a disassembled fitting structure for the rotating shaft 7, including the rotary engagement portion 15, by coupling them in the radial direction of the rotating shaft 7 with a detachable coupling portion 25. The base 21 is provided on the stirrer 5 side. Contact surfaces 33, 37 are provided between the base portion 21 and cap portion 23 and increase the contact force in response to the rotational torque acting on the base portion 21 and regulate the opening between the base portion 21 and the cap 23 portion.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a stirrer attachment structure for attaching and detaching a stirring blade or the like to a rotating shaft of a stirring device. [Background technology]

[0002] A conventional agitator mounting structure of this type is, for example, the agitator blade mounting structure described in Patent Document 1.

[0003] The stirring blades (also called scraping blades) attached by this stirring bar attachment structure are attached, for example, in multiple numbers along a rotation shaft. The rotation shaft is arranged as a horizontal axis inside the stirring vessel of the stirring device. The stirring vessel is, for example, a horizontal stirring kettle whose bottom forms part of a cylinder.

[0004] The stirring blade is provided at the tip of the stirring arm, and a boss portion is provided at the base of the stirring arm, and the boss portion is fitted and fixed to the rotating shaft.

[0005] The boss portion is composed of a base portion fixed to the stirring arm on the stirring blade side, and a cap portion that is combined with the base portion. The base portion has a half-split hole that is aligned with the outer surface of the rotating shaft.

[0006] The cap portion is provided with a half-split hole that fits into the outer surface of the rotary shaft. An engaging protrusion with a circular cross section is provided on the inner surface of the half-split hole so as to protrude radially toward the outer surface of the rotary shaft. An engaging recess is provided on the outer surface of the rotary shaft corresponding to the engaging protrusion. The engaging recess fits and locks the engaging protrusion.

[0007] To attach the stirring arm to the rotating shaft, first, the cap portion is connected to the base portion with a connecting pin. During this connection, the cap-side connecting portions of the cap portion are fitted to both sides of the base-side connecting portions of the base portion. Next, the connecting pin is inserted from one side of the cap-side connecting portion, passing through the base-side connecting portion, with the tip of the connecting pin facing out from the cap-side connecting portion on the opposite side. A split pin is inserted into the locking hole at the tip of the connecting pin to prevent it from falling off. This allows the cap portion to be rotatably connected to the base portion with the connecting pin.

[0008] A fastening pin is inserted into the insertion hole of the base portion, and a nut is fastened to the fastening pin, so that the fastening pin is supported in advance on the base portion.

[0009] Next, the half-holes of the base and cap are fitted to the outer surface of the rotary shaft, with the engaging protrusions of the cap fitting into the engaging recesses of the rotary shaft to position them.

[0010] Next, the jig is engaged with the head of the fastening pin, and the fastening pin is rotated around its axis to fasten the fastening tongue to the engaging tongue. This secures the boss to the rotating shaft. This attachment is performed on each of the multiple stirring blades to the rotating shaft.

[0011] When the rotating shaft is driven to rotate, the stirring blades scrape and slide against the inner surface of the stirring vessel, thereby stirring the ingredients contained in the stirring vessel.

[0012] After stirring is complete, the fastening pin is rotated using a jig to separate the fastening tongue from the engaging tongue, thereby allowing the cap to rotate relative to the base around the connecting pin.

[0013] The cap can be opened by rotating it around the connecting pin relative to the base, which disengages the boss from the rotating shaft, allowing for thorough cleaning of the agitating blades and arms, as well as the area around the rotating shaft.

[0014] However, when such an easily cleanable agitator blade mounting structure is adopted, a force in the direction of opening the base and cap parts is likely to act between the fastening tongue and the engaging tongue, which creates the problem that managing the fastening of the fastening pin, i.e., maintaining the combined connection between the base and cap parts, is complicated.

[0015] Patent Document 2 also proposes a scraping and pressing type heating and stirring kettle in which a scraping blade is rotated forward and backward to perform scraping and stirring. In this kettle, the scraping blade is supported so that it can swing back and forth within a certain range in the direction of rotation, and the tip of the scraping blade is pressed against the inner surface of the heating container due to the resistance of the material being stirred when the blade is rotated forward. When the blade is rotated backward, the resistance of the material being stirred adhered to the back surface of the scraping blade causes the tip of the scraping blade to float against the inner surface of the heating container through a certain range of swing, and the material being stirred adhered to the back surface of the scraping blade is spread in a film or layer on the material remaining in a film on the inner surface of the heating container. When the blade is rotated forward after being reversed, the tip of the scraping blade is pressed against the inner surface of the heating container, scraping off the material remaining in a film form along with the material being spread in a film or layer.

[0016] When the agitator blades are attached to such a device using the easily cleanable agitator blade mounting structure described in Patent Document 1 and the device is operated in both forward and reverse agitation, a force in the direction of opening the gap between the base and cap parts is likely to act between the fastening tongue and the engaging tongue not only during forward rotation but also during reverse rotation, which creates the problem that managing the fastening of the fastening pins, i.e., maintaining the combined connection between the base and cap parts, is complicated.

[0017] Furthermore, this problem is not limited to stirring blades, but can also occur with rod-shaped stirring bars attached to a rotating shaft. [Prior art documents] [Patent documents]

[0018] [Patent Document 1] Patent No. 4152616 [Patent Document 2] Patent No. 4226630 Summary of the Invention [Problem to be solved by the invention]

[0019] The problem to be solved is that when an attachment structure that allows for easy cleaning is used to perform stirring rotation, the maintenance and management of the combined connection between the base part and the cap part is cumbersome. [Means for solving the problem]

[0020] The present invention provides a stirrer attachment structure having a boss portion that supports a stirrer, which stirs an object in a stirring vessel, on a rotating shaft, in order to facilitate the maintenance and management of the combined connection between a base portion and a cap portion. The structure has a rotational engagement portion that engages in the rotational direction between the rotating shaft and the boss portion to prevent rotation between the rotating shaft and the boss portion, and the boss portion is combined in the radial direction of the rotating shaft by a detachable coupling portion. Including the rotational engagement portion The stirring device includes a base portion and a cap portion that are separable and fitted to the rotating shaft, the base portion being provided on the stirring bar side, cap a contact portion that receives a rotational torque acting on the base portion and restricts the gap between the base portion and the cap portion, The contact portion includes a slope that presses the rotational engagement portion in a direction that restricts the gap between the cap portions so that the contact force of the rotational engagement portion increases according to the rotational torque. . [Effects of the Invention]

[0021] With the above-described configuration, when the rotating shaft is driven to rotate, the agitator rotates around the rotating shaft due to the rotational engagement between the rotating shaft and the boss, allowing the agitator to agitate the material in the agitation container. The base and cap are joined together in the radial direction of the rotating shaft by the joint, creating a disassembly fit structure for the rotating shaft, allowing the agitator to be attached to the rotating shaft. The combination of the base and cap of the boss can be disassembled by detaching the joint, allowing for easy cleaning. When the agitator rotates, the contact portion receives a rotational torque acting on the base, allowing the agitator to restrict the gap between the base and cap. This restriction on the gap facilitates maintenance and management of the combined connection between the base and cap. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a schematic side view, partly in cross section, showing the agitator attachment structure in relation to the rotating shaft and the agitator vessel according to the first embodiment. FIG. [Figure 2] FIG. 2 is a schematic perspective view showing the stirrer attachment structure in relation to the stirrer according to the first embodiment. [Figure 3] 1 is a schematic side view showing the stirring bar mounting structure in relation to a cross section of a rotating shaft according to the first embodiment. FIG. [Figure 4] FIG. 2 is a schematic exploded perspective view showing the stirring bar mounting structure in relation to the rotation shaft according to the first embodiment. [Figure 5] 1 is a schematic exploded side view showing the stirrer attachment structure in relation to the cross section of the rotating shaft according to the first embodiment. FIG. [Figure 6] FIG. 2 is a plan view of a main part of a rotating shaft according to the first embodiment. [Figure 7] FIG. 2 is a cross-sectional view of a main part of a rotating shaft according to the first embodiment. [Figure 8] FIG. 1A is a perspective view of a base portion, and FIG. 1B is a perspective view of a cap portion according to a first embodiment. [Figure 9] 1A is a side view showing the assembled relationship between the rotating shaft and the connecting pin according to a comparative example, and FIG. 1B is a side view showing the assembled relationship between the rotating shaft and the connecting pin according to the first embodiment. [Figure 10] FIG. 10 is a schematic side view showing the stirring bar mounting structure in relation to the cross section of the rotating shaft according to the second embodiment. [Figure 11] FIG. 11 is a schematic side view showing the stirrer attachment structure in relation to the cross section of the rotating shaft according to the third embodiment. [Figure 12] FIG. 10 is a schematic side view showing the stirrer attachment structure in relation to the cross section of the rotating shaft according to the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0023] The present invention achieves the object of facilitating maintenance and management of the combined connection between the base portion and the cap portion as follows.

[0024] The agitator mounting structure has a boss portion that supports the agitator, which agitates the material to be stirred in the stirring vessel, on a rotating shaft, and has a rotational engagement portion between the rotating shaft and the boss portion that engages in the rotational direction to prevent rotation between the rotating shaft and the boss portion, and the boss portion has a base portion and a cap portion that are combined in the radial direction of the rotating shaft by a detachable connecting portion to form a disassemblable fitting structure with the rotating shaft, and the base portion is provided on the agitator side and has a contact portion between the base portion and the cap portion that receives the rotational torque acting on the base portion and regulates the gap between the base portion and the cap portion.

[0025] The contact portion can be realized by a contact surface that increases the contact force in response to the rotational torque acting on the base portion.

[0026] The contact surface is formed on both the base portion and the cap portion, but it is sufficient if it can increase the contact force in accordance with the rotational torque acting on the base portion and regulate the gap between the base portion and the cap portion.It is also possible to form the contact surface on one of the base portion and the cap portion, and realize the other as a convex portion that is not a surface, etc.

[0027] In other words, the contact portion only needs to be able to receive the rotational torque acting on the base portion and regulate the gap between the base portion and the cap portion, and can be realized in various configurations such as interlocking surfaces, a surface and a convex portion, interlocking convex portions, or interlocking convex portions.

[0028] The stirring vessel is, for example, a horizontal stirring vessel whose bottom is approximately semicircular in radial cross section. However, the bottom may be less than or more than semicircular in radial cross section as long as the stirrer can rotate. Alternatively, the stirring vessel may be a vertical stirring vessel whose bottom forms part of a sphere.

[0029] The agitator can be realized by a scraping blade that agitates the material while scraping the bottom of the agitation vessel, or a rod-shaped agitator that agitates or loosens the material.

[0030] The object to be stirred is food, but it is not limited to food, and can also be medicine, quasi-drug, herbal medicine, and various materials.

[0031] The connecting portion comprises a fixed pin fixed to one of the base portion and the cap portion and a first connecting hole formed in the other portion into which the fixed pin is releasably fitted to serve as a pivot point; the connecting portion comprises a connecting pin that can be inserted and detached into second connecting holes in both the base portion and the cap portion; and when the base portion and the cap portion are fitted into a closed fitting structure around the rotation axis by the pivot point, the connecting pin can be inserted into the second connecting hole to maintain the fitting structure.

[0032] The coupling pin can be realized by arranging its axis in the same direction as the rotation axis.

[0033] The rotational engagement portion can be realized by a rotational engagement surface on the outer surface of the rotary shaft and a rotational engagement surface on the inner surface of the boss portion.

[0034] The rotational engagement surfaces can be relatively inclined planes on both outer surfaces of the rotating shaft that form a wedge-shaped radial cross section, or parallel planes on both sides of the radial cross section of the rotating shaft, or multiple planes that form a polygonal radial cross section of the rotating shaft, and the rotational engagement surfaces can be relatively inclined planes that face the relatively inclined planes, or parallel planes that face the parallel planes, or multiple planes that face the multiple planes that form the polygon.

[0035] However, the rotational engagement portion only needs to be able to prevent rotation between the rotating shaft and the boss portion, and can be realized by an engagement convex portion provided on one side of the base portion or the cap portion and an engagement concave portion provided on the other side, as in Patent Document 1. [Example]

[0036] Fig. 1 is a schematic side view, partly in cross section, showing the agitator bar attachment structure in relation to the rotating shaft and the agitator vessel, and Fig. 2 is a schematic perspective view showing the agitator bar attachment structure in relation to the agitator.

[0037] The agitator mounting structure of the first embodiment includes a boss portion 1. The boss portion 1 supports the agitator 5, which agitates the material in the agitator vessel 3, on the rotating shaft 7. The agitator vessel 3 is, for example, a horizontally placed agitator kettle whose bottom portion 3a forms an approximately semicircular cross section in the radial direction. The agitator 5 mainly comprises a plate-shaped scraping blade 5a made of fluororesin or the like, and the blade mounting plate 5b is rotatably supported by a knuckle portion 9a at the tip of the agitator arm 9 via a knuckle pin 9b. The agitator arm 9 includes the boss portion 1 at its base, and the boss portion 1 is fixed so as to fit onto the rotating shaft 7. A spring may be provided between the knuckle portion 9a and the blade mounting plate 5b to bias the scraping blade 5a against the bottom portion 3a.

[0038] Therefore, as the rotating shaft 7 rotates in the forward direction, or in the forward and reverse directions, the stirring bar 5 at the tip rotates around the rotating shaft 7, allowing various types of paste, bean paste, jelly bean paste, jam, marmalade, custard cream, etc. to be heated, stirred, cooked, etc. The structure of the boss portion 1 will now be further explained with reference to Figs. 3 to 9. Fig. 3 is a schematic side view showing the stirrer mounting structure in relation to a cross section of the rotating shaft. Fig. 4 is a schematic exploded perspective view showing the stirrer mounting structure in relation to the rotating shaft. Fig. 5 is a schematic exploded side view showing the stirrer mounting structure in relation to a cross section of the rotating shaft. Fig. 6 is a plan view of the main parts of the rotating shaft. Fig. 7 is a cross-sectional view of the main parts of the rotating shaft. Fig. 8(A) is a perspective view of the base portion, and Fig. 8(B) is a perspective view of the cap portion. Fig. 9(A) is a side view showing the assembly relationship between the rotating shaft and the connecting pin according to a comparative example, and Fig. 9(B) is a side view showing the assembly relationship between the rotating shaft and the connecting pin according to Example 1.

[0039] 3 to 7, a rotational engagement portion 15 is provided between the rotary shaft 7 and the boss portion 1. The rotational engagement portion 15 engages in the rotational direction to prevent rotation between the rotary shaft 7 and the boss portion 1.

[0040] The rotational engagement portion 15 is a rotational engagement surface 17 on the outer surface of the rotating shaft 7 and a rotationally engaged surface 19 on the inner surface of the boss portion 1. The rotational engagement surface 17 is a relatively inclined plane on both outer surfaces of the rotating shaft 7, which has a wedge-shaped radial cross section. The angle formed by the rotational engagement surfaces 17 is θ. This angle θ can be set appropriately. The rotational engagement surfaces 17 are formed at a predetermined interval in the portion of the rotating shaft 7 that joins the boss portion 1. The axial length of the rotational engagement surface 17 is formed to be equal to the axial width of the boss portion 1.

[0041] The rotatable engaged surface 19 is a relatively inclined plane that faces the relatively inclined plane of the rotatable engaging surface 17. The angle formed by the rotatable engaged surfaces 19 is approximately the same as the angle θ between the rotatable engaging surfaces 17. When the boss portion 1 is attached to the rotating shaft 7 so that the rotatable engaged surface 19 abuts against the rotatable engaging surface 17, the boss portion 1 is positioned in the axial direction of the rotating shaft 7 by the steps on both sides of the rotatable engaging surface 17.

[0042] 3 to 5 and 8, the boss portion 1 includes a base portion 21 and a cap portion 23, which are joined together in the radial direction of the rotating shaft 7 by a detachable joining portion 25 to form a fitting structure that can be disassembled onto the rotating shaft 7. The base portion 21 and the cap portion 23 include divided holes 27 and 29. The divided holes 27 and 29 are formed across the width of the base portion 21 and the cap portion 23, which is the axial direction of the rotating shaft 7. The divided holes 27 and 29 cooperate to form a fitting structure for the rotating shaft 7.

[0043] The base portion 21 is provided with a connecting protrusion 30. The protrusion 30 of the base portion 21 is fixed to the base of the stirring arm 9 and is provided on the stirrer 5 side. The dividing hole 27 of the base portion 21 has an arc with approximately the same curvature as the outer circumferential circle of the rotating shaft 7. A relief surface 31 is formed on each side of the dividing hole 27 of the base portion 21 in the radial direction of the rotating shaft 7. The relief surface 31 is formed across the width of the base portion 21 to prevent the cap portion 23 from contacting the base portion 21. Continuously with both relief surfaces 31, contact surfaces 33 are formed along the relief surfaces 31 across the width of the base portion 21.

[0044] The contact surface 33 is provided between the base portion 21 and the cap portion 23, and constitutes one of the contact portions that receives rotational torque acting on the base portion 21 and restricts the gap between the base portion 21 and the cap portion 23. In the embodiment, the contact surface 33 has the function of increasing the contact force of the cap portion 23 against a contact portion described below in response to the rotational torque acting on the base portion 21, thereby restricting the gap between the base portion 21 and the cap portion 23. For this reason, the contact surface 33 is oriented radially inward of the rotating shaft 7 and is inclined toward the cap portion 23.

[0045] An outer clearance surface 34 is further provided adjacent to the contact surface 33 along the contact surface 33. The clearance surface 34, like the clearance surface 31, serves to relieve the cap portion 23 from contact with the base portion 21.

[0046] The relief surfaces 31 and 34 ensure that the contact surface 33 contacts the contact portion on the cap portion 23 side, which will be described later. However, these relief surfaces 31 and 34 may be omitted.

[0047] The cap portion 23 is formed with the same width as the base portion 21. The divided hole 29 of the cap portion 23 has an arc portion 35 having substantially the same curvature as the outer circumferential circle of the rotary shaft 7, and the rotationally engaged surfaces 19 on both sides of the arc portion 35. The arc portion 35 of the cap portion 23 faces the arc of the divided hole 27 of the base portion 21 across the rotary shaft 7. Abutment surfaces 37 are formed on both sides of the divided hole 29 of the cap portion 23 in the radial direction of the rotary shaft 7. The abutment surfaces 37 of the cap portion 23 are formed across the width of the cap portion 23 and face the abutment surface 33 of the base portion 21.

[0048] The contact surface 37 of the cap portion 23 is provided between the base portion 21 and the cap portion 23, and constitutes the other of the contact portions that receives the rotational torque acting on the base portion 21 and regulates the gap between the base portion 21 and the cap portion 23. In the embodiment, the contact surface 37 has the function of receiving the contact surface 33 of the base portion 21 in response to the rotational torque acting on the base portion 21, thereby increasing the contact force and regulating the gap between the base portion 21 and the cap portion 23. For this reason, the contact surface 37 is oriented radially outward of the rotating shaft 7, and is an inclined surface that faces the contact surface 33 on the base portion 21 side.

[0049] However, one of the contact surfaces 33, 37 may be formed as a contact portion other than a surface.

[0050] The base portion 21 and cap portion 23 of the boss portion 1 are joined together in the radial direction of the rotary shaft 7 by a detachable joining portion 25, and together with the rotational engagement portion 15, form a fitting structure that can be disassembled for the rotary shaft 7.

[0051] The connecting portion 25 has a fixed pin 39 fixed to one of the base portion 21 and the cap portion 23, and a first connecting hole 41 formed on the other, into which the fixed pin 39 is releasably fitted to serve as a pivot point.

[0052] The fixing pin 39 protrudes from the pin support portion 43 of the cap portion 23. The fixing pin 39 extends in the axial direction of the rotary shaft 7 within the pin arrangement recess 45 of the cap portion 23. In the axial direction of the rotary shaft 7, the pin support portion 43 and the fixing pin 39 are each formed with dimensions that are approximately half the width of the cap portion 23. The tip of the fixing pin 39 is approximately flush with the end face of the cap portion 23.

[0053] The pin support portion 43 includes a first cap-side arcuate convex surface 47. The first cap-side arcuate convex surface 47 is formed by an arc concentric with the fixing pin 39, and extends from the contact surface 37 side to the outer peripheral surface of the cap portion 23 in the radial direction of the rotary shaft 7. The pin arrangement recess 45 includes a first cap-side arcuate concave surface 49. The first cap-side arcuate concave surface 49 is formed by an arc concentric with the fixing pin 39.

[0054] The first coupling hole 41 is formed in a first base-side coupling portion 51 of the base portion 21. The first base-side coupling portion 51 has a first base-side arcuate convex surface 53. The first base-side arcuate convex surface 53 extends from the contact surface 33 side to the outer peripheral surface of the base portion 21 in the radial direction of the rotation shaft 7. The first base-side arcuate convex surface 53 is formed by an arc of approximately the same size as the first cap-side arcuate concave surface 49. The first base-side arcuate convex surface 53 is concentric with the first coupling hole 41 and is capable of fitting into the first cap-side arcuate concave surface 49.

[0055] A first base-side arcuate concave surface 55 is provided adjacent to the first base-side connecting portion 51 in the axial direction of the rotary shaft 7. The first base-side arcuate concave surface 55 is formed by an arc of approximately the same size as the first cap-side arcuate convex surface 47. The first base-side arcuate concave surface 55 is concentric with the first coupling hole 41 and can be fitted into the first cap-side arcuate convex surface 47.

[0056] Therefore, when the fixing pin 39 is inserted axially into the first connecting hole 41 so as to align the dividing holes 27, 29 of the base portion 21 and the cap portion 23, the first connecting hole 41 and the fixing pin 39 become a rotation fulcrum between the base portion 21 and the cap portion 23. When the base portion 21 and the cap portion 23 rotate around the first connecting hole 41 and the fixing pin 39 as a rotation fulcrum, relative rotation is permitted between the first cap-side arcuate convex surface 47 of the pin support portion 43 and the first base-side arcuate concave surface 55 of the base portion 21, and relative rotation is permitted between the first cap-side arcuate concave surface 49 of the cap portion 23 and the first base-side arcuate convex surface 53 of the first base-side connecting portion 51.

[0057] The coupling portion 25 includes a coupling pin 59 that can be inserted into and removed from second coupling holes 57 of both the base portion 21 and the cap portion 23 .

[0058] The second coupling hole 57 on the base portion 21 side is formed in a second base-side coupling portion 61 of the base portion 21. The second base-side coupling portion 61 is formed to have a size that is approximately one-third of the width of the base portion 21 in the axial direction of the rotating shaft 7. The second base-side coupling portion 61 is disposed in the center of the base portion 21 in the width direction. The second base-side coupling portion 61 has a second base-side arcuate convex surface 63. The second base-side arcuate convex surface 63 extends from the contact surface 33 side to the outer peripheral surface of the base portion 21 in the radial direction of the rotating shaft 7. The second base-side arcuate convex surface 63 is formed concentrically with the second coupling hole 57 and is set to have a size equivalent to that of the first base-side arcuate convex surface 53.

[0059] The second base-side arcuate concave surface 65 is provided adjacent to the second base-side connecting portion 61 in the axial direction of the rotation shaft 7 on both sides. The second base-side arcuate concave surface 65 is formed concentrically with the second coupling hole 57 and is set to a size equivalent to that of the first base-side arcuate concave surface 55.

[0060] The second coupling hole 57 on the cap portion 23 side is formed in a second cap-side coupling portion 67 of the cap portion 23. The second cap-side coupling portion 67 is formed to have a size that is approximately one-third the width of the cap portion 23 in the axial direction of the rotary shaft 7. The second cap-side coupling portions 67 are arranged on both sides of the cap portion 23 in the width direction. The second cap-side coupling portion 67 has a second cap-side arcuate convex surface 69. The second cap-side arcuate convex surface 69 extends from the contact surface 37 of the cap portion 23 to the outer peripheral surface of the cap portion 23 in the radial direction of the rotary shaft 7. The second cap-side arcuate convex surface 69 is formed as an arc of approximately the same size as the second base-side arcuate concave surface 65. The second cap-side arcuate convex surface 69 is formed concentrically with the second coupling hole 57 of the cap portion 23.

[0061] A second cap side arcuate concave surface 71 is provided between the second cap side connecting portion 67 and the second cap side connecting portion 67 in the axial direction of the rotation shaft 7. The second cap side arcuate concave surface 71 is formed by an arc of approximately the same size as the second base side arcuate convex surface 63. The second cap side arcuate concave surface 71 is formed concentrically with the second coupling hole 57 of the cap portion 23.

[0062] Therefore, when the base portion 21 and the cap portion 23 are arranged in a closed fitting structure relative to the rotation axis 7 by the pivot point, the second base side connecting portion 61 is positioned between the second cap side connecting portions 67 and both second connecting holes 57 are connected, so that the connecting pin 59 can be inserted into the second connecting hole 57 from one of the second cap side connecting portions 67 side to maintain the fitting structure.

[0063] The connecting pin 59 has a head 73 at one end and a rotating tab 75 at the bifurcated portion at the other end. The rotating tab 75 is supported so as not to rotate due to frictional force, and is designed to be rotated by hand by an operator, for example.

[0064] Therefore, by inserting the tip of the connecting pin 59 into the second connecting hole 57 from one of the second cap side connecting portions 67, facing outward from the other second cap side connecting portion 67, and rotating the rotating tab 75, the connecting pin 59 can be easily prevented from coming out.

[0065] In this case, the coupling pin 59 can be kept prevented from coming off even when the rotary shaft 7 is driven to rotate.

[0066] When the rotating tab 75 is used to prevent the connecting pin 59 from coming off, in the comparative example structure in which the axis of the connecting pin 59 is assembled in a direction perpendicular to the rotating shaft 7 as shown in Figure 9(A), centrifugal force acts on the rotating tab 75 when the rotating shaft 7 is driven to rotate, making the rotating tab 75 prone to rotate relative to the connecting pin 59. In order to prevent the connecting pin 59 from coming off, it is necessary to firmly support it in a tightened state so that it does not rotate easily.

[0067] In contrast, in the assembly of Example 1 shown in Figure 9(B), the axis of the connecting pin 59 is oriented along the rotation axis 7, and even if centrifugal force acts on the rotating tab 75, the rotating tab 75 is unlikely to rotate relative to the connecting pin 59, thereby reliably preventing the connecting pin 59 from falling off.

[0068] However, the rotation tab 75 can also be configured to be tightly supported so that it does not rotate easily, and rotated using a jig.Instead of the rotation tab 75, a split pin can be attached to a hole formed at the tip of the connecting pin to prevent it from coming loose.

[0069] [Installation and removal] To attach the stirring bar 5 and stirring arm 9 to the rotating shaft 7 using such a structure, the cap portion 23 is first supported for rotation on the base portion 21 and joined to it (the former case), or the cap portion 23 is first attached to the rotating shaft 7 alone (the latter case).

[0070] (In the former case) The former connection is performed by aligning the split holes 27, 29 of the base portion 21 and the cap portion 23, as described above, and inserting the fixing pin 39 of the cap portion 23 axially into the first connecting hole 41 of the base portion 21.

[0071] In this connected state, the cap portion 23 is opened from the base portion 21 using the first connecting hole 41 and the fixing pin 39 as a pivot point, and the split hole 29 of the cap portion 23 is brought into opposition to the rotational engagement surface 17 of the rotary shaft 7. From this position, the cap portion 23 is moved radially of the rotary shaft 7 to fit the split hole 29 of the cap portion 23 onto the rotary shaft 7. This fitting brings the rotationally engaged surface 19 of the cap portion 23 into contact with the rotational engagement surface 17 of the rotary shaft 7. At this time, the wedge action between the rotationally engaged surface 19 and the rotational engagement surface 17 is used, making it possible to attach the cap portion 23 to the rotary shaft 7 without any rattle.

[0072] (in the latter case) In the latter case, the cap portion 23 is aligned with the rotational engagement surface 17 of the rotary shaft 7 at the split hole 29, and the split hole 29 of the cap portion 23 is fitted onto the rotary shaft 7 in the same manner as above. This fitting brings the rotationally engaged surface 19 of the cap portion 23 into contact with the rotational engagement surface 17.

[0073] Next, the fixing pin 39 of the cap portion 23 is inserted into the first coupling hole 41 of the base portion 21 in the axial direction, so that the base portion 21 is rotatably supported by the cap portion 23.

[0074] (Common to both the former and latter) Next, in both the former and latter cases, the base portion 21 is rotated around the first coupling hole 41 and the fixing pin 39 as a pivot point to align it with the cap portion 23 .

[0075] In this state, the second base side connecting portion 61 fits between the second cap side connecting portions 67, so the connecting pin 59 is inserted into the second connecting hole 57 as described above, and the rotating tab 75 is rotated to prevent it from coming loose.

[0076] In this assembled state, the contact surfaces 33, 37 of the base portion 21 and the cap portion 23 are in contact with each other or face each other.

[0077] To remove the connector, the rotating tab 75 is rotated by hand or the like in the direction along the connecting pin 59. In this state, the connecting pin 59 can be easily pulled out of the second connecting hole 57.

[0078] Next, the base portion 21 is rotated around the first coupling hole 41 and the fixing pin 39 as a pivot point to open it relative to the cap portion 23 .

[0079] Here, the base portion 21 and the cap portion 23 are removed from the rotating shaft 7 by pulling the cap portion 23 out from the rotation engagement surface 17 of the rotating shaft 7, and then the engagement between the fixing pin 39 and the first connecting hole 41 is pulled out to separate the base portion 21 and the cap portion 23.

[0080] Alternatively, the base portion 21 can be removed by pulling out the first coupling hole 41 from the fixing pin 39 of the cap portion 23 attached to the rotary shaft 7, and then the cap portion 23 can be removed by pulling out the cap portion 23 from the rotation engagement surface 17 of the rotary shaft 7.

[0081] In these states, the base portion 21 and the cap portion 23 are in a disassembled state as shown in FIG.

[0082] In this way, the stirring bar 5 and stirring arm 9 together with the boss portion 1 can be attached to and detached from the rotary shaft 7 with a single touch in an extremely simple manner.

[0083] This makes it extremely easy to clean the boss portion 1 and the like, and also extremely easy to attach them to the rotating shaft 7 after cleaning. In particular, when the agitator 5 and agitator arm 9 are heavy objects that can barely be held individually with both hands, the detachable structure makes it easy to attach and detach such heavy objects, and even when multiple pieces are attached to the rotating shaft 7, cleaning and attachment / detachment operations can be performed extremely easily.

[0084] [Rotational drive] When the rotating shaft 7 is rotated in the attached state, the agitator 5 at the tip of the agitator arm 9 rotates, for example, in the forward direction of arrow A in Figure 1, scraping and sliding against the inner surface of the agitator vessel 3, thereby scraping and stirring the material contained in the agitator vessel 3.

[0085] When the stirrer is turned in the direction of arrow B in FIG. 1, the resistance of the material adhering to the backside of the scraping blade, which is the stirrer 5, causes the tip of the scraping blade to rise from the inner surface of the bottom 3a due to a certain range of oscillation. This lifting causes the material adhering to the backside of the scraping blade to be spread in a film or layer on the inner surface of the bottom 3a. This spreading occurs on the material that remained in a film form during normal rotation. Then, when the stirrer is turned in the normal direction after the reversal, the tip of the scraping blade is pressed against the inner surface of the bottom 3a, scraping off the film-like material on the bottom 3a together with the spread material, allowing it to be stirred and cooked.

[0086] When the rotary shaft 7 is driven to rotate, the agitator 5 experiences rotational resistance, and a rotational torque acts on the base portion 21 via the agitator arm 9. In response to this rotational torque, the base portion 21 rotates relative to the cap portion 23 around the connecting pin 59 or the fixed pin 39 during forward or reverse rotation, and the contact force of the contact surfaces 33, 37 on the fixed pin 39 side or the connecting pin 59 side increases.

[0087] Therefore, the torque of the rotating shaft 7 is transmitted to the base portion 21 via the engagement between the rotational engagement surface 17 and the rotational engaged surface 19, through the cap portion 23, the fixing pin 39, the connecting pin 59, and the contact surfaces 33 and 37, and the stirrer 5 is driven to scrape via the stirring arm 9. At this time, the rotational engagement surface 17 and the rotational engaged surface 19 are engaged in a wedge shape between the rotating shaft 7 and the boss portion 1, so that torque can be reliably transmitted from the rotating shaft 7 to the stirring arm 9.

[0088] The contact force of the contact surfaces 33 and 37 acts in a direction pressing the rotationally engaged surface 19 of the cap portion 23 against the rotationally engaging surface 17 of the rotary shaft 7 , and increases in accordance with the rotational torque acting on the base portion 21 .

[0089] Therefore, the opening of the cap portion 23 is suppressed by the contact force according to the torque, and the opening between the base portion 21 and the cap portion 23 can be restricted.

[0090] This restriction on the opening eliminates the need to perform maintenance and management of the combined connection between the base portion 21 and the cap portion 23 at the fastening portion, etc., and makes the management easier.

[0091] Furthermore, the contact surfaces 33, 37 contribute to torque transmission as described above, and the increase in contact force according to the rotational torque, combined with the wedge-shaped engagement of the rotational engaging surface 17 and the rotational engaged surface 19, ensures that torque is transmitted reliably and without rattle. [Example]

[0092] FIG. 10 is a schematic side view showing the stirring bar mounting structure in relation to the cross section of the rotating shaft according to the second embodiment.

[0093] In the stirring bar mounting structure of the second embodiment, the rotational engagement portion 15 between the boss portion 1 and the rotary shaft 7 is changed.

[0094] In the rotational engagement portion 15 of this embodiment 2, one of the rotational engagement surface 17 and the rotational engaged surface 19 formed on the left and right in the radial direction (the left side in Figure 10) is not sloped and is formed parallel to the radius of rotation.

[0095] In the second embodiment, the wedge effect can also be obtained by the inclination of one of the rotation engaging surface 17 and the rotation engaged surface 19.

[0096] Other configurations are the same as those of the first embodiment, and the second embodiment can also achieve the same effects as those of the first embodiment. [Example]

[0097] FIG. 11 is a schematic side view showing the stirring bar mounting structure in relation to the cross section of the rotating shaft according to the third embodiment.

[0098] In the stirring bar mounting structure of the third embodiment, the rotational engagement portion 15 between the boss portion 1 and the rotary shaft 7 is changed.

[0099] In the rotational engagement portion 15 of the second embodiment, neither the rotational engagement surface 17 nor the rotational engaged surface 19 formed on the left and right sides in the radial direction is provided with a gradient, and is formed parallel to the radius of rotation.

[0100] In this embodiment 3, the rotational engagement surface 17 and the rotational engaged surface 19 have no slope, and there is no wedge effect, but the contact force of the contact surfaces 33 and 37 ensures reliable engagement between the rotational engagement surface 17 and the rotational engaged surface 19.

[0101] Other configurations are the same as those of the first embodiment, and the third embodiment can also achieve the same effects as those of the first embodiment. [Example]

[0102] FIG. 12 is a schematic side view showing the stirring bar mounting structure in relation to the cross section of the rotating shaft according to the fourth embodiment.

[0103] In the stirring bar mounting structure of the fourth embodiment, the shapes of the base portion 21 and the cap portion 23 of the boss portion 1 are reversed.

[0104] Referring to Figure 12 and referring to the components and symbols of Example 1, a sloped rotational engagement surface 19 is formed in the base side dividing hole 27, and the first base side connecting part 51 having the first connecting hole 41, which is a component of the base part 21 in Example 1, the first base side arc concave surface 55, the second base side connecting part 61 having the second connecting hole 57, and the second base side arc concave surface 65 are components of the cap part 23.

[0105] Accordingly, in Example 1, the pin support portion 43 supporting the fixing pin 39, the pin placement recess 45, the second cap side connecting portion 67 forming the second connecting hole 57, and the second cap side arc portion 71, which are components of the cap portion 23, are configured as components of the base portion 21.

[0106] By changing the configuration in this way, the first cap side arcuate convex surface 47 becomes the first base side arcuate convex surface, the first cap side arcuate concave surface 49 becomes the first base side arcuate concave surface 49, the first base side connecting portion 51 becomes the first cap side connecting portion 51, the first base side arcuate convex surface 53 becomes the first cap side arcuate convex surface 53, the first base side arcuate concave surface 55 becomes the first cap side arcuate concave surface 55, and the second base side connecting portion 61 is the second cap side connecting portion 61, the second base side arc convex surface 63 is the second cap side arc convex surface 63, the second base side arc concave surface 65 is the second cap side arc concave surface 65, the second cap side connecting portion 67 is the second base side connecting portion 67, the second cap side arc convex surface 69 is the second base side arc convex surface 69, and the second cap side arc concave surface 71 is the second base side arc concave surface 71.

[0107] Even with such a change in configuration, the fourth embodiment is basically the same as the first embodiment, and the same effects as the first embodiment can be achieved in the fourth embodiment. [Explanation of symbols]

[0108] 1 Boss part 3. Stirring vessel 5 Stirrer 7 Rotation Axis 15 Rotational engagement part 17 Rotational engagement surface 19 Rotating engaged surface 21 Base 23 Cap part 25 Joint 33 Base contact surface 37 Cap contact surface 39 Fixing pin 41 First coupling hole 57 Second connecting hole 59 Connecting pin

Claims

1. A stirring bar mounting structure having a boss portion that supports a stirring bar that stirs an object to be stirred in a stirring vessel on a rotating shaft, a rotation engaging portion is provided between the rotary shaft and the boss portion and engages in a rotational direction to prevent rotation between the rotary shaft and the boss portion; the boss portion includes a base portion and a cap portion that are joined together in the radial direction of the rotary shaft by a detachable joining portion to form a disassemblable fitting structure for the rotary shaft, including the rotational engagement portion; The base portion is provided on the stirring bar side, a contact portion is provided between the base portion and the cap portion, the contact portion receiving a rotational torque acting on the base portion and restricting the gap between the base portion and the cap portion; the contact portion includes an inclined surface that presses the rotational engagement portion in a direction that restricts the gap between the cap portions so that the contact force of the rotational engagement portion increases in accordance with the rotational torque. Stirrer mounting structure.

2. The stirring bar mounting structure according to claim 1, The contact portion is a contact surface that increases a contact force in response to a rotational torque acting on the base portion. Stirrer mounting structure.

3. The stirring bar mounting structure according to claim 1 or 2, the coupling portion includes a fixing pin fixed to one of the base portion and the cap portion, and a first coupling hole formed in the other of the base portion and into which the fixing pin is releasably fitted to serve as a pivot point; the coupling portion includes a coupling pin that is insertable into and detachable from second coupling holes of both the base portion and the cap portion; When the base portion and the cap portion are brought into a closed fitted structure around the rotation shaft by the pivot point, the coupling pin is inserted into the second coupling hole to maintain the fitted structure. Stirrer mounting structure.

4. The stirring bar mounting structure according to claim 3, The coupling pin has an axis aligned in the same direction as the rotation axis. Stirrer mounting structure.

5. The stirring bar mounting structure according to any one of claims 1 to 4, The rotational engagement portion is a rotational engagement surface on the outer surface of the rotary shaft and a rotational engaged surface on the inner surface of the boss portion. Stirrer mounting structure.

6. The stirring bar mounting structure according to claim 5, the rotational engagement surfaces are relatively inclined planes on both outer surfaces of the rotating shaft that form a wedge-shaped radial cross section, or parallel planes on both sides of the rotating shaft in a radial cross section, or a plurality of planes that form a polygonal radial cross section of the rotating shaft, The rotationally engaged surface is a relatively inclined plane opposite to the relatively inclined plane, or a parallel plane opposite to the parallel plane, or a plurality of planes opposite to the plurality of planes forming the polygon. Stirrer mounting structure.

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