JP2011200775A - Connection device and connecting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a stirring shaft of a stirrer from dropping out of a driving shaft.SOLUTION: A key member 13 is fixed to a first longitudinal groove 40e of the stirring shaft 40 with a bolt 18, the stirring shaft 40 is inserted to the shaft hole 12a of a second coupling 12, a falling preventing member 14 which inhibits the stirring shaft 40 from falling from the second coupling 12 is arranged to the base end surface 40d of the stirring shaft 40, a washer 15 is arranged on the falling preventing member 14 and is fixed to the falling preventing member 14 with a bolt 19, the falling preventing member 14 is fixed by screwing a nut 16 tightly to the bolt parts 40g of the stirring shaft 40, a first tongue piece 15b of the washer 15 is bent and installed along the side surface 16a of the nut 16 and a second tongue piece 15c of the washer 15 is bent and engaged to a notch part 14b of the falling preventing member 14, and the second coupling 12 attaching the stirring shaft 40 is fastened to the first coupling 11 rotating integrally with a driving shaft 52a of a driving part 50.

Description

  The present invention relates to a connecting device that connects a stirring shaft of a stirrer that stirs a liquid by rotating the stirring shaft with a drive unit and the drive unit, and a connection device that prevents the stirring shaft from falling off the drive shaft. It is about the method.

  An agitator is widely used that agitates a solution or slurry liquid contained in a tank by rotating a stirring shaft with a motor. In such a stirrer, a rotation shaft that is a part of a motor is connected via a speed reduction mechanism that adjusts the number of rotations of the rotation shaft and a first connection mechanism, and a drive shaft that is a part of the speed reduction mechanism. Is connected to a stirring shaft having a stirring blade through a second connecting mechanism. The stirrer drives the motor, rotates the stirring shaft via the first coupling mechanism, the speed reduction mechanism, and the second coupling mechanism, and stirs the liquid in the tank by the stirring blades of the stirring shaft. .

  In such a stirrer, three types of rotating shafts, that is, a rotating shaft of a motor, a driving shaft of a speed reduction mechanism, and a stirring shaft are connected by two connecting mechanisms, and the stirring shaft for stirring the liquid in the tank is provided. It is installed above the tank.

  Therefore, when the stirrer is disconnected for some reason during operation, the stirrer shaft drops from the connecting mechanism and falls into the tank containing the liquid. When the process is stopped, not only the operation efficiency is lowered, but also the tank may be damaged in some cases.

  In particular, in the connection mechanism between the drive shaft and the agitation shaft, when performing relatively minor work such as replacement of the agitation blade, the work should be performed with the agitation shaft installed above the tank from the viewpoint of work efficiency. preferable. For this reason, the stirring shaft must be prevented from falling off during operation while being easily removed from the drive shaft.

  Patent Document 1 describes a technique for preventing the drive shaft from falling off inside the speed reduction mechanism. However, as in Patent Document 1, the frequency of disassembling the speed reduction mechanism and removing the drive shaft is less than removing the drive shaft and the stirring shaft. In addition, the work for disassembling the speed reduction mechanism cannot be easily performed by removing the remaining portion from which the drive shaft and the stirring shaft have been removed in advance from the tank and in another work place.

  Also, at the connection between the drive shaft and the agitation shaft, the base end of the agitation shaft is tapered and inserted into the shaft hole of the coupling, and a drop-off prevention member is agitated on the end surface of the agitation shaft on the base end side. The agitation shaft is prevented from dropping from the drive shaft by tightening the bolt portion provided on the end surface on the base end portion side of the shaft and the corresponding nut. Furthermore, a washer is sandwiched between the drop-off prevention member and the nut, and this washer prevents the nut from loosening with respect to the bolt portion provided on the end face on the base end side of the stirring shaft.

  The rotation of the drive shaft is transmitted to the agitation shaft by inserting a key member into a key groove formed by vertical grooves formed in the coupling and the agitation shaft, respectively. Furthermore, a notch is formed around the drop-off prevention member, and the coupling and the stirring shaft rotate in synchronization with the notch being engaged with the key member. Therefore, there is no damage due to friction between the coupling and the drop-off prevention member, and the drop-off prevention member is provided so as not to loosen the nut fixed to the stirring shaft.

  However, particularly when the load for rotating the agitation shaft is large, the agitation shaft may fall off during operation due to a slight displacement of the washer due to poor assembly or a slight displacement of the key member due to a slight taper processing failure. .

For example, in the case of a tank of about 30 m ³ used for chlorine leaching of nickel sulfide compounds, the stirrer shaft does not fall off even with a conventional stirrer (stirrer shaft diameter of about 160 mm), but as the production increases, When the tank is about ˜60 m ^3, the conventional agitator (diameter of about 210 mm of the agitation shaft) which is enlarged in accordance with the size of the tank may cause the agitation shaft to drop off, which is a major operational problem. It was.

JP 2004-1000077 A

  The present invention was made to solve such a situation, and in a coupling device that couples the stirring shaft of the stirrer that rotates and stirs the stirring shaft with the drive unit and the drive shaft of the drive unit, It is an object of the present invention to provide a connecting device and a connecting method for preventing the stirring shaft from falling off the drive shaft.

  In order to solve the above-described problems, a connecting device according to the present invention includes a stirring shaft of a stirrer that stirs a liquid contained in a tank by rotating the stirring shaft with a drive unit, and a drive shaft of the drive unit. And a second coupling having a shaft hole that is fastened to the first coupling and through which the agitation shaft is inserted. Is inserted into a key groove composed of the coupling, and a first vertical groove formed on the base end side of the stirring shaft and a second vertical groove formed on the second coupling, A key member for transmitting the rotational driving force transmitted to the second coupling to the agitation shaft, and a nut on the end surface on the proximal end side of the agitation shaft via a washer on the end surface on the proximal end side It is fixed by tightening to the formed bolt part, and the second coupling A drop-off preventing member that is abutted around the hole to restrict the movement of the stirring shaft in the drop-off direction and prevents the stirring shaft from dropping from the second coupling, and the washer can be bent A first tongue piece and a second tongue piece, the first tongue piece being bent toward the nut side and provided along the side surface of the nut, and the second tongue piece being When the key member is disposed in the first vertical groove, one end of the stirring shaft is bent when the key member is engaged with a notch formed around the drop-off prevention member. Projecting from the end face on the base end side of the first end, the one end being engaged with the cutout portion of the drop-off prevention member, and the first bolt being fastened to the screw hole of the first vertical groove, Tighten the second bolt to the drop-off prevention member in the screw hole of the drop-off prevention member. Only to be fixed.

  Further, the connecting device according to the present invention is a connecting device that connects the stirring shaft of the stirrer that stirs the liquid stored in the tank by rotating the stirring shaft with the drive unit and the drive shaft of the drive unit. The first coupling that rotates integrally with the drive shaft of the drive unit, the second coupling that is fastened to the first coupling and has a shaft hole through which the stirring shaft is inserted, and Inserted into a key groove composed of a first vertical groove formed on the base end side of the stirring shaft and a second vertical groove formed in the second coupling, A key member that transmits the transmitted rotational driving force to the agitation shaft, and a nut formed on the end surface on the proximal end side of the agitation shaft via a washer on a bolt portion formed on the end surface on the proximal end side It is fixed by tightening and is pushed around the shaft hole of the second coupling. A drop-off preventing member for restricting movement of the stirring shaft in the drop-off direction and preventing the stirring shaft from dropping from the second coupling, and the washer includes a first tongue piece that can be bent, A second tongue piece, the first tongue piece being bent toward the nut side and provided along the side surface of the nut, and the second tongue piece being bent toward the drop-off prevention member side. And is engaged with a notch formed around the drop-off prevention member, and when the key member is disposed in the first vertical groove, one end of the end surface on the proximal end side of the stirring shaft is provided. The one end is engaged with the notch of the washer, and the first bolt is fastened to the screw hole of the first vertical groove and fixed.

  Furthermore, the coupling device according to the present invention is a coupling device that couples the stirring shaft of the stirrer that stirs the liquid contained in the tank by rotating the stirring shaft with the drive unit and the drive shaft of the drive unit. The first coupling that rotates integrally with the drive shaft of the drive unit, the second coupling that is fastened to the first coupling and has a shaft hole through which the stirring shaft is inserted, and Inserted into a key groove composed of a first vertical groove formed on the base end side of the stirring shaft and a second vertical groove formed in the second coupling, A key member that transmits the transmitted rotational driving force to the agitation shaft, and a nut formed on the end surface on the proximal end side of the agitation shaft via a washer on a bolt portion formed on the end surface on the proximal end side It is fixed by tightening and is pushed around the shaft hole of the second coupling. A drop-off preventing member for restricting movement of the stirring shaft in the drop-off direction and preventing the stirring shaft from dropping from the second coupling, and the washer includes a first tongue piece that can be bent, A second tongue piece, the first tongue piece being bent toward the nut side and provided along the side surface of the nut, and the second tongue piece being bent toward the drop-off prevention member side. And is engaged with a notch formed around the drop-off prevention member, and when the key member is disposed in the first vertical groove, one end of the end surface on the proximal end side of the stirring shaft is provided. The one end is engaged with the notch of the washer, and the washer is positioned at a position corresponding to the base end of the key member. Fastened to the screw hole and fixed.

  Furthermore, the connection method according to the present invention is a connection for connecting the agitation shaft of the stirrer that agitates the liquid contained in the tank by rotating the agitation shaft by the drive unit and the drive shaft of the drive unit. In the method, the key member is fastened to the first vertical groove formed at the proximal end portion of the stirring shaft by fixing the first bolt to the screw hole of the first vertical groove, and the key member is fixed. While inserting the agitated shaft into the second vertical groove formed in the second coupling connected to the first coupling rotating integrally with the drive shaft of the drive unit, The stirring shaft is inserted into the shaft hole formed in the second coupling, and the stirring shaft is dropped from the second coupling on the end surface on the proximal end side of the stirring shaft inserted into the second coupling. A drop-off prevention member is disposed to prevent the drop-off, and the drop-out is disposed on the end face on the base end side of the stirring shaft. A washer having a bendable first tongue piece and a second tongue piece is arranged on the stop member, and the washer arranged on the drop-off prevention member is attached to the drop-off prevention member with a second bolt. The drop-off prevention member is fastened and fixed to the screw hole of the drop-off prevention member, and the drop-off prevention member is fastened to the bolt portion formed on the end surface on the base end side of the stirring shaft via the washer, and the stirring shaft The first tongue piece is bent to the fixing nut side and provided along the side surface of the nut, and the second tongue piece is provided on the side of the drop-off prevention member. The second coupling to which the agitation shaft is attached and the first coupling are fastened to be engaged with a notch formed around the drop-off prevention member.

  In the present invention, the key member inserted into the key groove is fixed to the first vertical groove formed in the stirring shaft by tightening the bolt into the screw hole of the first vertical groove. For example, the key member auctions from the key groove to prevent the drop prevention member and the washer from advancing, and the key member is displaced due to processing defects, etc., preventing the nut tightened on the bolt portion of the stirring shaft from loosening. can do. Therefore, it is possible to reliably prevent the stirring shaft from dropping from the drive shaft of the drive unit of the stirrer.

  Further, according to the present invention, the washer provided between the drop-off prevention member and the nut is fixed to the drop-off prevention member by tightening the bolt into the screw hole of the drop-off prevention member. Prevents the nuts fastened to the bolt part of the stirring shaft from loosening and coming off from the bolt part of the stirring shaft by rotating with respect to the drop-off prevention member, etc. can do. Therefore, the washer and the drop-off prevention member can be reliably rotated integrally, and the stirring shaft can be reliably prevented from dropping from the drive shaft of the drive unit of the stirrer.

  Further, according to the present invention, the one end portion of the key member protrudes from the end surface of the base end portion of the stirring shaft to the base end side, and this one end portion is engaged with the notch portion of the dropout preventing member. However, it is possible to prevent the nut that is rotated with respect to the stirring shaft due to vibration during operation and the like and that is fastened to the bolt portion of the stirring shaft from being loosened and detached from the bolt portion of the stirring shaft. Therefore, the stirring shaft and the drop-off preventing member can be reliably rotated integrally, and the stirring shaft can be reliably prevented from dropping from the drive shaft of the drive unit of the stirrer.

It is the perspective view which showed the stirrer with which the connection apparatus with which this invention was applied is used. It is the exploded front view showing the connecting device to which the present invention was applied. It is front sectional drawing which showed the coupling device with which this invention was applied. It is side surface sectional drawing which showed the coupling device with which this invention was applied. It is the disassembled perspective view which showed the base end part side of the stirring shaft.

  Hereinafter, a connecting device to which the present invention is applied will be described in detail with reference to the drawings. As shown in FIG. 1, the coupling device 1 to which the present invention is applied includes a stirrer shaft 40 in a stirrer 20 that stirs the liquid stored in the tank 30 by rotating the stirrer shaft 40 with a drive unit 50. And the drive unit 50 are used for connection. Hereinafter, the stirrer 20 using the coupling device 1 to which the present invention is applied will be described in the following order.

1. 1. Description of configuration of stirrer (1-1) Description of overall configuration (1-2) Description of configuration of connecting device (1-3) Description of method of connecting stirrer shaft and drive unit 2. Embodiment of coupling device to which the present invention is applied Effects of the coupling device to which the present invention is applied

1. 1. Description of Configuration of Stirrer (1-1) Description of Overall Configuration The stirrer 20 stirs the liquid 30 stored in the tank 30 and the liquid stored in the tank 30 as shown in FIG. The stirring shaft 40, the drive part 50 which rotationally drives this stirring shaft 40, and the connection apparatus 1 which connects the stirring shaft 40 and the drive part 50 are provided.

  As shown in FIG. 1, the tank 30 in which the liquid is stored has a main body portion 31 formed in a bottomed cylindrical shape with an open top, and a lid portion 32 that closes the opening of the main body portion 31. is doing.

The main body 31 has a volume of about 50 to 60 m ³ and accommodates a solution or slurry liquid therein. In addition, the agitation shaft 40 is accommodated inside the main body 31 so that the base end portion 40 b of the agitation shaft 40 is drawn out from a through hole 33 formed in the upper surface of the lid portion 32.

  The lid portion 32 is provided so as to be removable from the main body portion 31. In the tank 30, the liquid is injected into the main body 31 and the agitation shaft 40 is exchanged with the lid 32 removed from the main body 31. The lid portion 32 is formed with a through hole 33 that exposes the base end portion 40 b of the stirring shaft 40 coupled to the coupling device 1 to the outside of the main body portion 31. Further, the outer surface 32 a of the lid portion 32 is provided with a protective member 34 that protects the coupling device 1, a speed reduction mechanism 52 described later, and a base end portion 40 b of the stirring shaft pulled out from the through hole 33. The protection member 34 is provided in, for example, a cylindrical shape or a conical shape, and has a divided structure composed of a plurality of divided members.

  As shown in FIG. 1, when the agitation shaft 40 is inserted into the tank 30 with the distal end portion 40 a as an insertion end and housed inside the tank 30, the base end portion 40 b is pulled out from the lid portion 32. The agitation shaft 40 is provided with an agitation blade 41 for agitating the liquid contained in the tank 30 from the tip 40a to the middle.

  The stirring blade 41 is integrally provided by welding or the like at the front end portion 40a and the middle. Specifically, the stirring blade 41 is provided so as to be positioned in the vicinity of the bottom surface of the tank 30 and in the intermediate portion in the height direction of the tank 30 when the stirring shaft 40 is accommodated in the tank 30. The agitation blades 41 and 41 are rotationally driven integrally with the agitation shaft 40 as the agitation shaft 40 is rotationally driven, and agitate the liquid stored in the tank 30.

  In addition, although each stirring blade 41 has illustrated what has two blades in FIG. 1, it may have three or four blades, etc. Moreover, the stirring blade 41 is not limited to being provided at two locations on the stirring shaft 40, and it is sufficient that at least one location is provided. Furthermore, the stirring blade 41 may have a spiral blade.

  Further, as shown in FIGS. 2 and 3, the base end portion 40 b of the stirring shaft 40 is provided with a tapered portion 40 c that gradually decreases in diameter toward the base end portion 40 b side. A first vertical groove 40e is formed in the taper portion 40c substantially parallel to the axis P of the stirring shaft 40 from the base end surface 40d on the base end portion 40b side to the tip end portion 40a side to a predetermined position. The first vertical groove 40 e is formed so that the bottom surface of the groove is substantially parallel to the axis P of the stirring shaft 40, and a key member 13 to be described later that transmits the rotational driving force from the drive unit 50 to the stirring shaft 40. Is attached. In addition, a screw hole 40f is formed in the first vertical groove 40e in a direction orthogonal to the axis P. Bolts 18 for fixing the key member 13 are screwed into the screw holes 40f. As the bolt 18, for example, a hexagon socket head bolt having a diameter of about 8 to 12 mm is used.

  Further, a base end surface 40d on the base end portion 40b side of the stirring shaft 40 is provided with a bolt portion 40g that protrudes toward the base end portion 40b and has a thread groove formed on the outer periphery. A nut 16 to be described later is fastened to the bolt portion 40g.

  As shown in FIG. 1, the drive unit 50 includes a motor 51 that rotationally drives the stirring shaft 40, and a speed reduction mechanism 52 that adjusts the rotational speed of the stirring shaft 40 with respect to the rotational speed of the rotational shaft 51 a of the motor 51. Have. The motor 51 is fixed to a fixing member (not shown) and is installed above the tank 30. The speed reduction mechanism 52 is a combination of a plurality of gears, and adjusts the rotational speed of the drive shaft 52 a connected to the stirring shaft 40 with respect to the rotational speed of the rotational shaft 51 a of the motor 51. Such a drive unit 50 transmits the rotational driving force of the motor 51 to the agitation shaft 40 via the speed reduction mechanism 52 and rotationally drives the agitation shaft 40.

(1-2) Description of Configuration of Connecting Device As shown in FIGS. 2 and 4, the connecting device 1 includes a first coupling 11 that rotates integrally with the drive shaft 52 a of the speed reduction mechanism 52 of the drive unit 50. The second coupling 12 that is fastened to the first coupling 11, the key member 13 that transmits the rotational driving force transmitted to the second coupling 12 to the stirring shaft 40, and the base end portion of the stirring shaft 40 The base end face 40d on the 40b side is provided with a drop-off preventing member 14 that is fixed by tightening the nut 16 to the bolt part 40g via the washer 15.

  As shown in FIG. 2, the first coupling 11 has a cylindrical main body portion 11b having a shaft hole 11a through which the drive shaft 52a of the speed reduction mechanism 52 is inserted, and the main body portion 11b includes a flange portion 11c. Are integrally formed. The main body 11b is integrated by inserting the drive shaft 52a into the shaft hole 11a and screwing the drive shaft 52a with the inserted drive shaft 52a with a bolt or the like. Therefore, the first coupling 11 is rotationally driven integrally with the drive shaft 52a. The flange portion 11c has a plurality of first insertion holes 11d penetrating in the thickness direction.

  As shown in FIG. 2, the second coupling 12 has a cylindrical main body portion 12b having a shaft hole 12a formed with a taper corresponding to the tapered portion 40c of the stirring shaft 40. The flange portion 12d is integrally formed. On the inner surface of the shaft hole 12a of the main body portion 12b, a second vertical groove 12e into which a key member (described later) for transmitting the rotational driving force from the driving portion 50 to the stirring shaft 40 is inserted is formed substantially parallel to the axis P. Has been. The second vertical groove 12e and the first vertical groove 40e constitute a key groove into which the key member 13 that transmits the rotational driving force from the drive unit 50 to the stirring shaft 40 is inserted.

  Further, a plurality of second insertion holes 12f penetrating in the thickness direction are formed in the flange portion 12d. The second insertion holes 12 f are formed corresponding to the first insertion holes 11 d of the first coupling 11. Therefore, the first coupling 11 and the second coupling 12 are provided such that the first insertion hole 11d and the second insertion hole 12f coincide with each other and the flange portions 11c and 12d are abutted against each other. In the first coupling 11 and the second coupling 12, the bolt 17a is inserted into the second insertion hole 12f and the first insertion hole 11d from the second coupling 12 side, and the first cup It is fixed by being tightened with a nut 17b on the ring 11 side. Therefore, when the drive shaft 52a rotates, the second coupling 12 is rotationally driven integrally with the first coupling 11 integrated with the drive shaft 52a.

  As shown in FIGS. 2 and 5, the key member 13 has a rectangular plate shape. When the key member 13 is attached to the first vertical groove 40 e formed in the base end portion 40 b of the stirring shaft 40, the one end portion 13 a is The stirring shaft 40 has a length protruding from the base end surface 40d toward the base end portion 40b. The key member 13 has an insertion hole 13b penetrating in the thickness direction at a position corresponding to the screw hole 40f formed in the first vertical groove 40e when attached to the first vertical groove 40e. Is formed. In the insertion hole 13b, an insertion portion through which the shaft portion of the bolt 18 is inserted and a recess in which the head portion of the bolt 18 is hidden are formed continuously. Such a key member 13 is fixed to the first vertical groove 40e by the bolt 18 being inserted into the insertion hole 13b and screwed into the screw hole 40f.

  As shown in FIGS. 2 and 5, the drop-off prevention member 14 is provided in a substantially disc shape, and has an outer diameter on the side facing the first coupling 11 of the shaft hole 12 a of the second coupling 12. It has a larger outer diameter and a thickness with mechanical strength capable of supporting the stirring shaft 40.

  Such a drop-off prevention member 14 has a central through hole 14a penetrating in the thickness direction at the center. The central through hole 14a has a slightly larger diameter than the bolt part 40g of the stirring shaft 40, and the bolt part 40g is inserted therethrough. The drop-off prevention member 14 is disposed on the base end surface 40d of the stirring shaft 40 by inserting the bolt portion 40g through the central through hole 14a.

  Further, the dropout preventing member 14 is formed with a cutout portion 14b cut out so as to penetrate in the thickness direction. The notch 14 b is engaged with one end 13 a of the key member 13 protruding from the base end 40 b of the stirring shaft 40 when the drop-off preventing member 14 is disposed on the base end surface 40 d of the stirring shaft 40. Therefore, the drop-off prevention member 14 is reliably rotated integrally with the stirring shaft 40.

  Further, the drop-off prevention member 14 is formed with a screw hole 14c at a position sandwiched between the central through hole 14a and the cutout portion 14b of the main surface portion. A bolt 19 for fixing the washer 15 disposed on the dropout prevention member 14 is screwed into the screw hole 14c. Therefore, the drop-off prevention member 14 is reliably rotated integrally with the washer 15. In addition, as the bolt 19, for example, a hexagon socket head bolt having a diameter of about 8 to 12 mm is used.

  That is, the drop-off prevention member 14 has the central through hole 14a inserted into the bolt portion 40g of the stirring shaft 40 after the stirring shaft 40 is inserted into the shaft hole 12a of the second coupling 12, and the stirring portion 40 is stirred into the notch portion 14b. The base end surface 40d of the stirring shaft 40 is disposed on the base end surface 40d of the stirring shaft 40 so that the one end 13a of the key member 13 protruding from the base end surface 40d of the shaft 40 is engaged. It is fixed on 40d. Such a drop-off prevention member 14 is abutted against the abutting surface 12h around the shaft hole 12a of the second coupling 12, and restricts the stirring shaft 40 from moving in the drop-off direction on the tip end portion 40a side. The stirring shaft 40 is prevented from falling off from the second coupling 12.

  The screw hole 14c is not limited to being formed at a position sandwiched between the central through hole 14a and the notch 14b on the main surface portion, but is sandwiched between the central through hole 14a and the notch 14b. In addition to the positions, a plurality of positions may be provided.

  As shown in FIGS. 2 and 5, the washer 15 is provided in a substantially disc shape and has an outer diameter that is substantially the same as or slightly smaller than the outer diameter of the drop-off prevention member 14. Such a washer 15 has a central through-hole 15a penetrating in the thickness direction at the center. The central through hole 15a has a slightly larger diameter than the bolt part 40g of the stirring shaft 40, and the bolt part 40g is inserted therethrough. The washer 15 is disposed on the dropout prevention member 14 with the bolt portion 40g inserted through the central through hole 15a. The washer 15 is formed with a first tongue piece 15b and a second tongue piece 15c that can be bent.

  The first tongue piece 15b is provided so that a part of the washer 15 is bent toward the nut 16 and is along the side surface 16a of the nut 16 fastened to the bolt portion 40g. In addition, you may contact | abut. Such a washer 15 prevents the nut 16 from loosening by rotating with respect to the bolt part 40g after the nut 16 is fastened to the bolt part 40g.

  Further, the second tongue piece 15c is provided by cutting the outer tongue of the washer 15 toward the central through hole 15a, and the second tongue piece 15c is disposed on the drop-off preventing member 14. Then, it is bent toward the drop-off prevention member 14 and is engaged with the notch 14 b of the drop-off prevention member 14. Further, an insertion hole 15 d is formed in the washer 15 at a position corresponding to the screw hole 14 c of the dropout prevention member 14. The washer 15 is a drop-off prevention member 14 by the bolt 19 being screwed to the screw hole 14c through the insertion hole 15d. The washer 15 and the bolt 19 are spot welded. Therefore, the washer 15 is reliably rotated integrally with the drop-off preventing member 14, and the nut 16 provided on the washer 15 is prevented from rotating and loosening with respect to the drop-off preventing member 14.

(1-3) Description of Method for Connecting Stirring Shaft and Driving Unit Next, a method for connecting the stirring shaft 40 and the driving shaft 52a of the driving unit 50 will be described.

  First, as shown in FIG. 5, the key member 13 is disposed in a first vertical groove 40 e formed in the base end portion 40 b of the stirring shaft 40. The key member 13 is fixed to the first vertical groove 40 e by screwing the bolt 18 into the screw hole 40 f formed in the first vertical groove 40 e through the insertion hole 13 b of the key member 13.

  Next, as shown in FIG. 4, the base end portion 40 b of the stirring shaft 40 to which the key member 13 is fixed connects the key member 13 fixed to the first vertical groove 40 e to the second coupling 12. While being inserted into the longitudinal groove 12e, it is inserted into the shaft hole 12a of the second coupling 12 from the other end 12g side toward the one end 12c side.

  Next, the central through hole 14 a is inserted into the bolt portion 40 g of the stirring shaft 40, and the dropout prevention member 14 is disposed on the base end surface 40 d of the stirring shaft 40. At this time, the drop-off prevention member 14 is disposed on the base end surface 40d of the stirring shaft 40 so that the one end portion 13a of the key member 13 protruding from the base end surface 40d of the stirring shaft 40 is engaged with the notch portion 14b. .

  Next, the central through hole 15 a is inserted into the bolt portion 40 g of the stirring shaft 40, and the washer 15 is disposed on the dropout prevention member 14.

  Next, the washer 15 disposed on the drop-off prevention member 14 is fixed on the drop-off prevention member 14 by the bolt 19 being screwed into the screw hole 14c through the insertion hole 15d. The bolt 19 is spot welded to the washer 15. The drop-off prevention member 14 is fixed to the base end surface 40d of the stirring shaft 40 by tightening the nut 16 to the bolt portion 40g of the stirring shaft 40. The first tongue piece 15b is bent toward the nut 16 and provided along the side surface 16a of the nut 16, and the second tongue piece 15c is bent toward the drop-off prevention member 14 side. 14 is engaged with a notch portion 14b formed in the base plate 14.

  Next, the second coupling 12 to which the agitation shaft 40 is attached, and the first coupling 11 that rotates integrally with the drive shaft 52a of the speed reduction mechanism 52 of the drive unit 50 are connected to the first insertion hole 11d. The flanges 11c and 12d are abutted with each other so as to match the second insertion hole 12f. Then, the first coupling 11 and the second coupling 12 are such that the bolt 17a is inserted through the first insertion hole 12f and the first insertion hole 11d from the second coupling 12 side, and is inserted. 17a is fixed by being fastened by a nut 17b on the first coupling 11 side.

  After the bolt 19 is spot welded to the washer 15, the second tongue piece 15 c is bent toward the drop-off prevention member 14 and engaged with a notch 14 b formed on the drop-off prevention member 14. The drop-off prevention member 14 is fixed to the base end surface 40d of the stirring shaft 40 by tightening the nut 16 to the bolt portion 40g of the stirring shaft 40. Further, the first tongue piece 15b may be a connecting method in which the first tongue piece 15b is bent toward the nut 16 and provided along the side surface 16a of the nut 16.

2. Embodiment of connecting device to which the present invention is applied <Example 1>
In Example 1, the volume of the tank into which the liquid is placed is 60 m ³ , the amount of liquid contained therein is 55 m ³ , the diameter of the stirring shaft is approximately 210 mm, and a bolt with a diameter of 12 mm and a length of 30 mm is used. Then, in the position sandwiched between the central through hole 14a and the notch 14b of the main surface portion of the drop-off prevention member 14, specifically, at a position of 25 mm from the outer peripheral portion of the drop-off prevention member 14 to the central through hole 14a. 15 was screwed to fix the washer 15 to the drop-off prevention member 14, and the operation was carried out for 12 months.

  As a result, the stirring shaft 40 did not drop from the drive shaft 52a during this operation period. Further, in the periodic inspection after the operation, the portion of the drop-off prevention member 14 facing the key member 13 was not deformed, and the drop-off prevention member was not loosened only by confirming a slight scratch.

<Example 2>
In the second embodiment, in addition to the first embodiment, the key member 13 is screwed to the first vertical groove 40e of the stirring shaft 40 with the bolt of the size used in the first embodiment, and the first vertical groove 40e is secured. The operation for 12 months was carried out under the same conditions as in Example 1 except that the operation was fixed.

  As a result, the stirring shaft 40 did not drop from the drive shaft 52a during this operation period. Moreover, in the periodic inspection after the operation, it was confirmed that the portion of the drop-off prevention member 14 facing the key member 13 was not deformed or scratched, and the key member 13 was prevented from being displaced.

  Furthermore, in Examples 1 and 2, the work time for attaching the bolts 18 and 19 was increased by about 2 to 3 minutes compared to the prior art, but considering that the entire work is about 30 minutes, it is a sufficiently negligible time. The drive shaft 52a and the stirring shaft 40 could be connected.

<Comparative Example 1>
When the same operation as in Example 1 was carried out under the other conditions without using the bolts 18 and 19, one dropout occurred in 11 months, and the tank was damaged at that time. Took 15 days.
3. Effects of the connecting device to which the present invention is applied In the connecting device 1 according to the present invention, the key member 13 inserted in the key groove has the bolt 18 inserted into the first vertical groove 40e formed in the stirring shaft 40. Since the key member 13 is abutted from the key groove due to vibration during operation, the drop preventing member 14 and the washer 15 are auctioned due to vibration during operation, etc. It is possible to prevent the nut 16 fastened to the bolt part 40g of the stirring shaft 40 from being loosened by the key member 13 being displaced due to the above. Therefore, it is possible to reliably prevent the stirring shaft 40 from dropping from the drive shaft 52a of the drive unit 50 of the stirrer 20. Furthermore, the coupling device 1 according to the present invention can easily remove the key member 13 from the first vertical groove 40e by removing the bolt 18, and can easily remove the stirring shaft 40 from the drive shaft 52a. .

  In the connecting device according to the present invention, the washer 15 provided between the drop-off prevention member 14 and the nut 16 is fixed to the drop-off prevention member 14 by tightening the bolt 19 in the screw hole of the drop-off prevention member. Therefore, when the washer 15 is rotated with respect to the drop-off preventing member 14 due to vibration or the like during operation, or the washer is displaced and assembled due to improper assembly or the like, the nut fastened to the bolt portion 40g of the stirring shaft 40 16 can be prevented from loosening and coming off from the bolt part 40 g of the stirring shaft 40. Therefore, the washer 15 and the drop-off preventing member 14 can be reliably rotated integrally, and the stirring shaft 40 can be reliably prevented from dropping from the drive shaft 52a of the drive unit 50 of the stirrer 20. Furthermore, according to the coupling device 1 according to the present invention, the washer 15 can be easily detached from the drop-off preventing member 14 by removing the bolt 19, and the stirring shaft 40 can be easily detached from the drive shaft 52a.

  Further, according to the present invention, the one end portion 13a of the key member 13 protrudes from the base end surface 40d of the base end portion 40b of the stirring shaft 40 toward the base end side, and the one end portion 13a is related to the notch portion 14b of the dropout prevention member 14. Accordingly, the drop-off prevention member 14 rotates with respect to the stirring shaft 40 due to vibration during operation or the like, and the nut 16 fastened to the bolt portion of the stirring shaft loosens and the bolt portion 40g of the stirring shaft 40 is loosened. It can be prevented from coming off. Therefore, the stirring shaft 40 and the drop-off prevention member 14 can be reliably rotated integrally, and the stirring shaft 40 can be reliably prevented from dropping from the drive shaft 52a of the drive unit 50 of the stirrer 20. .

DESCRIPTION OF SYMBOLS 1 Connection apparatus, 11 1st coupling, 11a Shaft hole, 11b Main body part, 11c Flange part, 11d 1st insertion hole, 12 2nd coupling, 12a Shaft hole, 12b Main body part, 12c One end part, 12d Flange portion, 12e second vertical groove, 12f second insertion hole, 12g other end portion, 12h abutting portion, 13 key member, 13a one end portion, 13b insertion hole, 14 drop-off prevention member, 14a central through hole, 14b Notch, 14c Screw hole, 15 Washer, 15a Central through hole, 15b First tongue piece, 15c Second tongue piece, 15d Insertion hole, 16 nut, 16a side face, 17a bolt, 17b nut, 18 bolt, 19 bolt , 20 Stirrer, 30 tank, 31 body part, 32 lid part, 32a main surface, 33 through-hole, 34 protection member, 40 stirring shaft, 40a tip 40b Base end part, 40c Taper part, 40d Base end face, 40e First vertical groove, 40f Screw hole, 40g Bolt part, 41 Stirrer blade, 50 Drive part, 51 Motor, 51a Rotating shaft, 52 Reduction mechanism, 52a Drive axis

Claims (7)

In a connecting device that connects the stirring shaft of the stirrer that stirs the liquid stored in the tank by rotating the stirring shaft with the drive unit, and the drive shaft of the drive unit,
A first coupling that rotates integrally with the drive shaft of the drive unit;
A second coupling that is fastened to the first coupling and has a shaft hole through which the stirring shaft is inserted;
The second coupling is inserted into a key groove composed of a first vertical groove formed on the base end side of the stirring shaft and a second vertical groove formed on the second coupling. A key member that transmits the rotational driving force transmitted to the stirring shaft;
The nut is fixed to the end surface on the base end side of the stirring shaft by fastening a nut to a bolt portion formed on the end surface on the base end side via a washer, and the shaft hole of the second coupling is fixed. A drop-off preventing member which is abutted against the periphery and restricts movement of the stirring shaft in the drop-off direction, and prevents the stirring shaft from dropping from the second coupling;
The washer has a first tongue piece and a second tongue piece that can be bent, and the first tongue piece is bent to the nut side and is provided along the side surface of the nut. A second tongue piece is bent toward the drop-off prevention member and engaged with a notch formed around the drop-off prevention member;
When the key member is disposed in the first vertical groove, one end portion projects from the end surface on the proximal end portion side of the stirring shaft, and the one end portion is engaged with the notch portion of the drop-off preventing member. And the first bolt is fastened to the screw hole of the first longitudinal groove and fixed,
The washer is a coupling device that is fixed to the drop-off prevention member by tightening a second bolt in a screw hole of the drop-off prevention member.   The coupling device according to claim 1, wherein the second bolt is spot welded to the washer. In a connecting device that connects the stirring shaft of the stirrer that stirs the liquid stored in the tank by rotating the stirring shaft with the drive unit, and the drive shaft of the drive unit,
A first coupling that rotates integrally with the drive shaft of the drive unit;
A second coupling that is fastened to the first coupling and has a shaft hole through which the stirring shaft is inserted;
The second coupling is inserted into a key groove composed of a first vertical groove formed on the base end side of the stirring shaft and a second vertical groove formed on the second coupling. A key member that transmits the rotational driving force transmitted to the stirring shaft;
The nut is fixed to the end surface on the base end side of the stirring shaft by fastening a nut to a bolt portion formed on the end surface on the base end side via a washer, and the shaft hole of the second coupling is fixed. A drop-off preventing member which is abutted against the periphery and restricts movement of the stirring shaft in the drop-off direction, and prevents the stirring shaft from dropping from the second coupling;
The washer has a first tongue piece and a second tongue piece that can be bent, and the first tongue piece is bent to the nut side and is provided along the side surface of the nut. A second tongue piece is bent toward the drop-off prevention member and engaged with a notch formed around the drop-off prevention member;
When the key member is disposed in the first longitudinal groove, one end portion protrudes from the end surface on the base end side of the stirring shaft, and the one end portion is engaged with the notch portion of the washer. The connecting device is fixed by tightening the first bolt into the screw hole of the first vertical groove. In a connecting device that connects the stirring shaft of the stirrer that stirs the liquid stored in the tank by rotating the stirring shaft with the drive unit, and the drive shaft of the drive unit,
A first coupling that rotates integrally with the drive shaft of the drive unit;
A second coupling that is fastened to the first coupling and has a shaft hole through which the stirring shaft is inserted;
The second coupling is inserted into a key groove composed of a first vertical groove formed on the base end side of the stirring shaft and a second vertical groove formed on the second coupling. A key member that transmits the rotational driving force transmitted to the stirring shaft;
The nut is fixed to the end surface on the base end side of the stirring shaft by fastening a nut to a bolt portion formed on the end surface on the base end side via a washer, and the shaft hole of the second coupling is fixed. A drop-off preventing member which is abutted against the periphery and restricts movement of the stirring shaft in the drop-off direction, and prevents the stirring shaft from dropping from the second coupling;
The washer has a first tongue piece and a second tongue piece that can be bent, and the first tongue piece is bent to the nut side and is provided along the side surface of the nut. A second tongue piece is bent toward the drop-off prevention member and engaged with a notch formed around the drop-off prevention member;
When the key member is disposed in the first vertical groove, one end portion projects from the end surface on the base end side of the stirring shaft, and the one end portion is engaged with the notch portion of the washer,
The washer is a coupling device that is fixed to the drop-off prevention member by tightening a first bolt in a screw hole of the drop-off prevention member at a position corresponding to the base end of the key member.   The connecting device according to claim 4, wherein the first bolt is spot welded to the washer. In the connecting method of connecting the stirring shaft of the stirrer and the drive shaft of the driving unit that stirs the liquid stored in the tank by rotating the stirring shaft by the driving unit.
A key member is fastened to a first vertical groove formed at the base end of the stirring shaft, and a first bolt is fastened to a screw hole of the first vertical groove, and fixed.
A second vertical groove formed in a second coupling that connects the stirring shaft to which the key member is fixed to a first coupling that rotates the key member integrally with the drive shaft of the drive unit. And inserted into the shaft hole formed in the second coupling,
A drop-off preventing member that prevents the stirring shaft from falling off the second coupling is disposed on the end surface of the proximal end portion of the stirring shaft that is inserted through the second coupling,
A washer having a bendable first tongue piece and a second tongue piece is arranged on the drop-off preventing member arranged on the end face on the base end side of the stirring shaft,
The washer arranged on the drop-off prevention member is fixed to the drop-off prevention member by tightening the second bolt into the screw hole of the drop-off prevention member,
The drop-off prevention member is fastened to the end surface on the base end portion side of the stirring shaft by tightening a nut to the bolt portion formed on the end surface on the base end portion side of the stirring shaft via the washer,
The first tongue piece is bent to the fixed nut side and provided along the side surface of the nut, and the second tongue piece is bent to the drop-off prevention member side and formed around the drop-off prevention member. Engaged with the cutout
A coupling method for fastening the second coupling to which the agitation shaft is attached and the first coupling.   The connection method according to claim 6, wherein the second bolt is spot welded to the washer.

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