JPH0725365U - Kneading machine end face sealing device - Google Patents

Abstract

(57) [Abstract] [Purpose] To simplify the structure of the end face seal of a kneading machine, reduce leakage, and reduce packing wear. [Structure] A cylindrical inner member (13) is attached to a rotating shaft (3) so that one side of the stirring blade (2) abuts against the side. A packing (17) slidably contacts the other side surface of the inner member (13). A lip seal (12) is provided on the outer peripheral surface of the inner member (13) inward of the sliding contact portion. Leakage of the object to be kneaded by the stirring blade (2) is caused by the leakage of the lip seal (12).
First, the amount of leakage is reduced because the amount that reaches the sliding contact surface between the packing (17) and the inner member (13) is small. Further, since the outflow pressure at the sliding contact surface is reduced, the packing does not have to be strongly pressed against the inner member, and wear of the packing can be reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an end face seal device for a kneading machine, such as a kneader, which seals a rotary shaft portion of the kneading machine.

[0002]

[Prior art]

 In a kneading machine such as a kneader, particularly in a kneading machine in which kneading is performed in a state in which the pressure in the container is increased, the above-mentioned stirring blade is prevented so that the object to be processed does not leak along the rotating shaft of the stirring blade. The end face portion is sealed, and various structures have been proposed as such an end face sealing device. For example, a structure is known in which a packing is slidably contacted with the above-mentioned end surface. However, in this device, a sliding contact surface with the packing is present in the kneading container, and an object to be treated is provided on the outer peripheral edge of the sliding contact surface. Since they are in direct contact, the object to be processed may remain in the gap of the seal part, or coarse particles of the object to be processed may get caught in the sliding contact surface of the end face seal part due to rotation and enter. There is. In order to prevent such a situation, it is necessary to strongly press the above-mentioned packing against the above-mentioned end face, and as a result, it may cause wear of the packing earlier and cleaning the machine (cleaning the machine) may be troublesome. It was

[0003]

[Problems to be solved]

 The object of the present invention is, in the kneading machine as described above, having a simple structure, preventing the object to be treated from remaining in the voids of the seal part and the intrusion of coarse particles to the end face seal part, and even if a leak is generated. An object of the present invention is to provide an end face seal device for a kneading machine, which can be easily cleaned and the packing can be worn less.

[0004]

[Means for solving problems]

 According to the present invention, a cylindrical inner member is fitted to the base portion of the rotating shaft so that one side surface thereof abuts on the side surface of the stirring blade, and packing is provided so as to slidably contact the other side surface of the inner member. The end face seal device of the kneading machine is provided in which a lip seal is provided on the outer periphery of the inner member inside the sliding contact surface between the packing and the inner member, and the above object is achieved.

[0005]

[Action]

 The object to be kneaded in the kneading container does not leak to the outer peripheral surface of the rotating shaft due to the inner member fitted to the rotating shaft so as to contact the side surface of the stirring blade, and the inner member described above. The lip seal located on the outer periphery of the inner member prevents the object to be treated from remaining and intrudes into the end face seal portion. Leakage to the outside is prevented by the packing that is in sliding contact with the packing, and the packing is removed from the space inside the packing.

[0006]

【Example】

 A description will be given below with examples. In the figure, a stirring blade (2) is located in the container of the kneading machine formed by the side wall (1), and the rotating shaft (3) of the stirring blade (2) penetrates the side wall (1). It extends outward through the through hole (4). A mounting member (5) is welded to the through hole (4), and a fixing member (6) is detachably fixed to the outside of the mounting member (5) with a bolt (7).

A fitting portion (8) having a small diameter is formed on the inner side of the fixing member (6), and the fitting portion (8) is fitted into the receiving hole (9) of the mounting member (5). To meet. A back plate (11) and a lip seal (12) are provided between the flange (10) formed inside the receiving hole (9) and the end face of the fitting portion (8). The inner end edge of the ring (12) is engaged with the outer peripheral surface of the inner member (13) fitted to the base of the rotary shaft (3). In the figure, the back plate (11) and the lip seal (12) are provided one by one, but a plurality of them may be provided alternately, and preferably the side wall (1) is provided. It is provided close to the inner surface.

The inner member (13) is made of a cemented carbide member having wear resistance such as cemented carbide, ceramics or the like in a cylindrical shape, and one side surface thereof contacts the side surface of the stirring blade (2). It is fitted to the rotary shaft (3) and attached so as to rotate together with the rotary shaft. In the figure, an inner member made of cemented carbide is shrink-fitted onto the rotary shaft, and further, the rotation preventing sleeve (14) fitted to the rotary shaft (3) is fitted to the rotary shaft (3) so as to prevent idling. Although it is fixed with the screw (15) while being pressed against the outer end of the member (13), it can be fixed with other suitable fixing means. If the fixing means such as the anti-rotation sleeve can sufficiently fix the inner member, it is not necessary to shrink-fit the inner member.

A step portion (16) is formed on the inner member (13) outside the engaging portion of the lip seal (12), and the step portion (16) is slidably contacted with the step portion (16). A packing (17) is provided on the. The packing (17) is preferably made of a synthetic resin material, but can be mixed with various reinforcing materials or the like, or can be made of a metal material or the like, and the hole (18) of the fixing member (6) can be obtained. The O-ring (19) is slidably fitted into the hole (18) close to the sliding surface with the step (16) so as to engage with the outer peripheral surface of the packing of the fitting portion. ) Is provided. A narrow space is provided between the sleeve (14) and the outer peripheral surface of the sleeve (14) so as to eliminate leaks.

A flange (20) is formed on the outside of the packing (17), and a bolt (21) screwed to the fixing member (6) is inserted into the flange (20) to insert the bolt (21). A spring (24) is provided between the washer (23) of the nut (22) screwed to (21) and the flange (20), and the inner member (13) of the inner member (13) is provided at the inner end of the packing (17). The packing is biased inward so as to press the step (16). A plurality of bolts (7), bolts (21), etc. are provided with their phases changed in the circumferential direction.

When the stirring blade (2) is rotated by the rotating shaft (3) to knead the object to be processed, leakage of the object to be processed from the through hole (4) of the side wall (1) is caused by the inner member ( Even if there is a processing object that is first blocked by the lip seal (12) that engages with the outer periphery of 13) and passes through the lip seal portion, it is formed outside the inner member (13). It is blocked by a packing (17) that is in sliding contact with the step (16).

[0012]

[Effect of device]

 The present invention is configured as described above, one side is brought into contact with the side of the stirring blade, the tubular inner member is fitted on the rotating shaft, and the packing is slidably contacted with the other side of the inner member. Since the lip seal is provided on the outer periphery of the inner member inward of the sliding contact portion, leakage of the object to be processed in the kneading container is prevented by the lip seal, and the sliding contact portion between the inner member and the packing is prevented. Since the amount of the leaked material that reaches the sliding contact portion is significantly reduced and the outflow pressure of the leaked material that reaches the sliding contact portion is also reduced, the amount of oil that reaches the sliding contact portion is reduced. It does not need to be pressed strongly against the sliding surface like the above, the wear of the packing can be reduced, the cleaning is easy and it can be used for a long time, and the structure is simple and economical. is there.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Side Wall 2 Stirring Blade 3 Rotating Shaft 4 Through Hole 5 Mounting Member 6 Fixing Member 12 Lip Seal 13 Inner Member 16 Step 17 Packing

Claims (3)

[Scope of utility model registration request] 1. A cylinder in which a rotating shaft for rotating a stirring blade in a kneading container extends outwardly through a side wall of the container so that one side of the rotating shaft is in contact with a side surface of the stirring blade. -Shaped inner member is fitted and a packing is provided so as to be in sliding contact with the other side surface of the inner member, and a lip seal is provided on the outer periphery of the inner member inside the sliding contact surface between the packing and the inner member. The end face seal device of the kneader provided. 2. The end face seal device for a kneading machine according to claim 1, wherein an O-ring is provided on the outer circumference of the packing. 3. An end face seal device for a kneading machine according to claim 1, wherein the inner member is made of a super hard material and the packing is made of a plastic material.