JP5405253B2 - Clamp fitting for piping - Google Patents

Description

  The present invention relates to a clamp joint used when connecting ferrules of pipes through which various powders, liquids or gases flow.

  For example, in the field of synthetic resin molding and processing technology, the raw material resin compound for molding contains magnetic metal powder such as iron powder that may adversely affect the molding machine as an impurity. In order to remove this in the previous stage, the rod-shaped magnet having a strong magnetizing force is detachably attached to the piping path in which the raw material resin is sucked to the molding machine by pneumatic transportation or the like. Magnetic metal powder mixed in the resin is separated by magnetic adhesion.

  Since magnetic metal powder adheres to the outer periphery of the magnet in the piping path with time, the operation is stopped at regular intervals, the pipe connection at the ferrule part is released, and the magnet bar is removed from the piping system. Need to be cleaned. In such pipe connection and release, a clamp joint as shown in Patent Document 1 is generally used.

Japanese Patent Laid-Open No. 2-11992

  In the conventional clamp joint shown in FIG. 5 of the above-mentioned Patent Document 1, grooves 1a and 2a having trapezoidal cross sections are formed inside two metal fastening members 1 and 2 formed in a semicircular shape. The fastening members 1 and 2 are pivotally connected via a connecting member 3 at one end.

  Further, a fastening mechanism 4 is provided at the other end of these fastening members 1 and 2, and this fastening mechanism 4 is provided on one of the fastening members 1 and 2, for example, the fastening member 1. A bolt 4b rotatably supported by the supported support shaft 4a, a wing nut 4c screwed to the bolt 4b, and a locking cut formed on the other fastening member 2 to which the bolt 4b is locked. It is comprised from the notch groove 4d.

  For this reason, in order to release the pipe connection, the wing nut 4c must continue to rotate until it is disengaged from the notch groove 4d for locking, and there is a drawback that it takes time and effort to operate. Also, in order to reconnect after replacement or inspection, the wing nut 4c must be turned in the same manner, which is not quick and prevents leakage of powder and liquid flowing through the pipe. There is a problem that it is necessary to tighten the wing nut tightly, and the screw thread is gradually damaged and a sufficient tightening force cannot be obtained. In addition, as described above, since the conventional clamp joint uses a part having a thread as a tightening mechanism, food raw materials or the like are likely to adhere to the thread part, and there is a health concern in the food processing field. There were not a few cases.

  Therefore, the present inventor eliminates the problems of the above-described conventional piping clamp joints, can be connected and released with one touch, and can obtain a sufficient tightening force without using screw parts. In Japanese Patent Application No. 2009-104607, a piping clamp joint that can be used with confidence is provided.

  The clamp joint for piping according to this Japanese Patent Application No. 2009-104607 abuts the ferrules of both pipes by sandwiching a gasket in an annular groove recessed in the contact surface of the ferrule formed at the joint of the pipes. In the clamp joint that prevents the leakage of the granular material, liquid, or gas that flows into the pipe by tightly adhering to the outer periphery of the butted portion, a recess that can cover the outer periphery of the butted portion of the ferrules The lower ends of the pair of clamp bands that are bisected so as to form a substantially semicircular shape formed with a groove are connected to each other via a connecting bracket so as to be rotatable, and the free ends of the pair of clamp bands Are folded upward so as to maintain a parallel state with each other to form a pair of tightening portions having a U-shape when viewed from above, and one of the pair of tightening portions is formed. A link plate is pivotally attached to both sides of the fastening portion via a pin, and an operation lever having a cam portion formed at the base end portion is pivotally attached to the distal end portion of the pair of link plates via a pin. The cam receiving concave portion with which the cam portion formed at the base end portion of the operation lever is pressed is provided in the other tightening portion.

  According to the piping clamp joint according to Japanese Patent Application No. 2009-104607, a grip formed by a pair of link plates is put on the other tightening portion by gripping an operation lever that is rotatably attached to one tightening portion. Then, when the operating lever is turned in the direction of the clamp band, the cam portion formed at the base end of the operating lever comes into pressure contact with the cam receiving recess formed in the other tightening portion, and the other tightening portion is The airtightness and watertightness of the abutting portion between the ferrules of the pipe can be maintained by being pressed toward one of the tightening portions.

  Further, according to the piping clamp joint according to Japanese Patent Application No. 2009-104607, the screwing operation of a wing nut or the like is unnecessary as in the prior art, and the operability is greatly improved. In addition, the cam portion provided at the base end portion of the operation lever is structured to fit into the cam receiving recess provided in the other tightening portion, so that it has excellent durability and can withstand repeated use sufficiently. The advantage that can be obtained.

  However, the piping clamp joint according to this Japanese Patent Application No. 2009-104607 has not been added with a lock mechanism that can maintain the tightening state, and therefore, an external force opposite to the unexpected tightening direction is applied to the operation lever. It has been found that the cam portion may come off the cam receiving recess and the tightened state may be released.

  Therefore, according to the present invention, an operation lever that is pivotably attached to one tightening portion is grasped, and a pressure contact cam portion formed at a base end portion of the operation lever is recessed in the other tightening portion. Even if an external force in the direction opposite to the tightening direction is applied to the operating lever, a lock mechanism is added that can lock the state where the pipe ferrules are pressed together by pressing against a certain cam receiving recess. An object of the present invention is to provide a clamp joint for piping that does not come off from the recess.

If the structure of this invention for achieving the said objective is explained in full detail, the invention which concerns on Claim 1 will insert a gasket in the annular groove recessedly provided in the contact surface of the ferrule formed in the joint of piping. In this way, the ferrules of both pipes are butted against each other, and the ferrules are attached to the outer periphery of the butted portion to prevent the powder, liquid or gas flowing through the pipe from leaking to the outside. A pair of clamp bands that are bisected so as to form a substantially semicircular shape that can cover the outer periphery of the butting portion of the butt portion, and a connecting bracket that rotatably connects the lower ends of the clamp bands And a pair of tightening portions formed so that the free end portions of the pair of clamp bands are folded upward so as to maintain a substantially parallel state to each other, and are formed in a U shape when viewed from the top surface, A pair of link plates that are rotatably attached to both sides of either one of the tightening portions of the pair via a pin, and are rotatably attached to the distal ends of the pair of link plates via a pin An operation lever formed with a pressure contact cam portion at the base end portion, and a cam receiving recess recessed in the other tightening portion for pressing the pressure contact cam portion of the operation lever. In order to prevent the press contact cam portion from coming off from the cam receiving recess, a pair of guide plates is formed to project at the tip ends of the pair of link plates, and a long hole is formed in the pair of guide plates. A lock pin that can slide is disposed, and an engaging portion that can be engaged with the lock pin is formed in the vicinity of the press-contact cam portion formed at the base end portion of the operation lever. This is a clamp joint for piping.

  Further, in the invention according to claim 2, a spring is disposed between the pin attached to the distal end portion of the pair of link plates to support the operation lever and the lock pin, and the lock pin always supports the operation lever. The clamp joint for piping according to claim 1, wherein the clamp joint is biased toward a pin direction.

  According to the clamp joint for piping of the present invention, the pressure contact cam portion provided on the operation lever is brought into pressure contact with the cam receiving concave portion, and at the same time, the lock pin descends in the long hole of the guide plate, and is brought into contact with the pressure contact cam portion of the operation lever. Since the adjacent engaging portion is caught by the lock pin, the operation lever is locked, and even if a reverse external force is applied to the operation lever, the lock state is not released. The clamp joint for piping excellent in reliability can be provided.

  If a spring is placed between the fixed pin attached to the tip of the pair of link plates and the movable lock pin to support the operating lever, the lock will be locked regardless of the mounting position and direction of the clamp joint for piping. Since the pin is always pulled in the direction of the fixed pin, there is no possibility that the lock pin is detached from the engaging portion, and the pipe clamp joint is more reliable.

It is a perspective view which shows the use condition of the clamp joint for piping which concerns on this invention. It is sectional drawing which shows the butt | matching part of ferrules of piping. It is explanatory drawing when opening a pair of clamp bands and connecting ferrules of piping. It is explanatory drawing when a pair of clamp band is closed and the frame body formed of a link board is covered on the other fastening part. It is explanatory drawing when rotating a control lever and press-contacting the press cam part in a base end part to a cam receiving recessed part. It is explanatory drawing when a lock pin engages with the engaging part formed adjacent to the press-contact cam part of the operation lever. It is explanatory drawing of the spring suspended between the pin used as the fixed side, and the lock pin used as the movable side.

    Hereinafter, one embodiment of a clamp joint for piping of the present invention is described in detail based on a drawing.

    In the figure, 1 indicates a pipe through which various powders, liquids, or gases flow, and 2 indicates a ferrule formed at the joint of the pipe 1. Reference numeral 3 denotes an annular groove recessed on the contact surface of the ferrule 2, and 4 denotes an annular gasket that is fitted into the annular groove 3.

  Reference numeral 5 denotes an entire clamp joint that is tightly attached to the outer periphery of the abutting portion of the pipe 1 between the ferrules 2 and prevents the powder, liquid, or gas flowing through the pipe from leaking to the outside.

  The clamp joint 5 is mainly composed of a pair of clamp bands 6 a and 6 b which are divided into two substantially semicircular shapes, and the lower ends of the clamp bands 6 a and 6 b can be rotated or freely opened and closed via a connecting fitting 7. It is connected to. In the figure, reference numeral 8 denotes a stop pin for connecting the connecting bracket 7 and the lower ends of the clamp bands 6a and 6b.

  The clamp bands 6a and 6b which are bisected so as to form a substantially semicircular shape are formed in a cross-sectional groove shape so as to cover the outer periphery of the abutting portion between the ferrules 2 of the pipe 1, and the clamp bands 6a, The abutting portion between the ferrules 2 can be fitted into the concave groove of the clamp band in a state where 6b is opened.

  Next, 9a and 9b are bent upward so that the free end side of the pair of clamp bands 6a and 6b, that is, the side opposite to the side connected by the connecting metal fitting 7 can be maintained substantially parallel to each other. A pair of tightening portions formed so as to be substantially U-shaped when viewed from the side is shown, and one of the pair of tightening portions is provided with link plates 11 and 11 via pins 10 on both sides thereof. An operation lever 13 having a pressure cam portion 14 formed at a base end portion is rotatably attached to a distal end portion of the pair of link plates 11 and 11 via a pin 12.

As shown in the figure, guide plates 17 and 17 are formed at the front ends of the pair of link plates 11 and 11 so as to be substantially perpendicular to the link plates 11 and 11. Long holes 19 and 19 through which the lock pin 18 can move are formed. On the other hand, in the vicinity of the press-contact cam portion 14 formed at the base end portion of the operation lever 13, an engagement portion 20 that can be engaged with the lock pin 18 is provided as a recess. A curved portion 21 is formed on the upper surface of the engaging portion 20 so that the lock pin 18 is automatically pushed upward when the operation lever 13 is rotated.

  Further, in order that the lock pin 18 on the movable side is always pulled in the direction of the pin 12 on the fixed side, the pin 12 on the fixed side attached to the distal ends of the pair of link plates for supporting the operation lever; Between the lock pins 18, springs 22, 22 such as coil springs are attached. This is because the tightening portions 9a and 9b are not always located on the upper side of the place where the clamp joint 5 for piping is used, and the tightening portions 9a and 9b may be located on the lower side in some cases. This is because it is necessary to forcibly bias the pin toward the fixed side pin 12.

  It should be noted that spacers 15 and 15 are suitably inserted on both sides of the operation lever 13 so that the operation lever 13 is held at the center of the pin shaft 12, but in this case, The lower ends of the springs 22 and 22 are preferably engaged in grooves (not shown) formed on the outer periphery of the spacers 15 and 15.

  In the figure, reference numeral 16 denotes a cam receiving recess provided in the other tightening portion 9b. The press contact cam portion 14 formed at the base end portion of the operation lever 13 can be press-fitted. The cam receiving recess 16 is for pressing and locking the press cam portion 14 formed at the base end portion of the operation lever 13, so it may be a circular recess or the U-shaped center of the tightening portion 9b. Of course, a concave groove may be formed in the lateral direction to form a cam receiving concave portion.

    The embodiment of the clamp joint for piping according to the present invention will be described with reference to FIGS. 2 to 7. First, in the annular groove 3 formed in the contact surface of the ferrule 2 formed at the joint of the pipe 1. After inserting the gasket 4 into the ferrule 2, the ferrules 2 are butted together, and then the pair of clamp bands 6a, 6b of the clamp joint 5 are opened. Since the lower ends of the clamp bands 6a and 6b are pivotally attached to the connection fitting 7 by the stop pins 8 and 8, the clamp bands 6a and 6b can be easily opened largely (FIG. 3).

  After fitting the butted portions of the ferrules 2 into the recessed grooves of the opened clamp bands 6a and 6b, the clamp bands 6a and 6b are closed and the operation lever 13 attached to the tightening portion 9a is grasped and rotated. The other tightening portion 9b is surrounded by a frame formed by the pair of link plates 11, 11 and the pin 12 (FIG. 4). At this time, the lock pin 18 is pushed up along the long hole 19 of the guide plate 17 by the curved portion 21 formed on the upper surface of the press-contact cam portion 14 (FIG. 4).

  Next, when the operation lever 13 is rotated downward about the pin shaft 12, the press contact cam portion 14 provided at the base end portion of the operation lever 13 is rotated upward opposite to the movement of the operation lever 13. The tip cam surface of the pressure cam portion 14 moves in the direction of the cam receiving recess 16 provided in the tightening portion 9b, and the lock pin 18 is further pushed up by the curved portion 21 and reaches the vicinity of the highest point (FIG. 5).

  When the operation lever 13 is further rotated downward from the state of FIG. 5, the tip cam surface of the pressure contact cam portion 14 is tightly fitted into the cam receiving recess 16 of the tightening portion 9b, and at the same time, the tightening portion 9b is directed toward the tightening portion 9a. It will be strongly pulled toward the locked state. At the same time, the lock pin 18 is engaged with the engagement portion 20 provided in the vicinity of the press-contact cam portion 14, and the locked state is maintained (FIG. 6). That is, when the lock pin 18 biased toward the fixed pin 12 by the spring 22 is engaged with the engaging portion 20, the operation lever 13 is locked, and an upward external force is applied to the operation lever 13. Even if this is the case, the locked state is not released, and the piping clamp joint is excellent in reliability.

  On the contrary, to release the locked ferrule part, when the lock pin 18 engaged with the engagement part 20 is pushed up against the tensile force of the spring 22, the engagement part 20 is locked. 18 so that if the operation lever 13 is grasped and pushed upward, a downward force is applied to the pressure contact cam portion 14 and the cam surface is disengaged from the cam receiving recess 16 of the tightening portion 9b. If the frame formed by the pair of link plates 11 and 11 and the pin 12 is released from the tightening portion 9b, the clamp bands 6a and 6b can be easily opened to the left and right, and the clamp joint 5 is removed from the ferrule portion. be able to.

    Thus, according to the clamp joint for piping of the present invention, it is possible to maintain the airtightness and watertightness of the butted portions of the ferrules with a one-touch operation by simply rotating the operation lever downward, and the locked state. Even if a reverse external force is applied to the operating lever, the tightening state is not released, so that a highly reliable pipe clamp joint can be obtained.

  According to the clamp joint of the present invention, the conventional screwing operation is not required at the time of the detachment operation, and the workability is greatly improved. In addition, since the cam portion provided at the base end portion of the operating lever is fastened to the cam receiving recess recessed in the other tightening portion, it has excellent durability and can withstand repeated use sufficiently. Is. Further, since no screw parts are used, the sanitary property is good, and it is also suitable for pipe connection in the food processing field.

  The clamp joint for piping of the present invention can be applied not only to the field of synthetic resin molding as described above, but also to various fields in which piping is used in the manufacturing process, such as the field of food manufacturing and processing, the field of drug manufacturing and the like.

1: Piping 2: Ferrule 3: Annular groove 4: Gasket 5: Clamp joint 6a: Clamp band 6b: Clamp band 7: Connecting bracket 8: Stop pin 9a: Tightening portion 9b: Tightening portion 10: Pin 11: Link plate 12: Pin 13: Operation lever 14: Cam portion 15: Spacer 16: Cam receiving recess 17: Guide plate 18: Lock pin 19: Long hole 20: Engaging portion 21: Curved portion 22: Spring

Claims (2)

The ferrules of both pipes are butted together in an annular groove recessed in the contact surface of the ferrule formed at the joint of the pipes, and are firmly attached to the outer periphery of the butted portion. In a clamp joint that prevents leakage of powder particles, liquid, or gas flowing outside, a substantially semicircular shape is formed by forming a concave groove that can cover the outer periphery of the butted portion of the ferrules. A pair of halved clamp bands, a connecting metal fitting for pivotally connecting the lower ends of the clamp bands, and the free end portions of the pair of clamp bands are bent upward so as to maintain a substantially parallel state to each other. A pair of tightening portions formed so as to form a U-shape when viewed from the top surface, and a pair of tightening portions on either side of one of the tightening portions is rotatably attached via pins. A pair of digitized link plates, an operation lever formed with a pressure contact cam portion at a base end portion rotatably attached to the distal end portion of the pair of link plates via a pin, and a pressure contact cam portion of the operation lever. A cam receiving recess provided in the other tightening portion for pressure contact, and a pair of link plates at the distal ends of the pair of link plates to prevent the press contact cam portion from coming off from the cam receiving recess in the tightened state. A guide plate is formed to project , a long hole is formed in the pair of guide plates, a lock pin that can slide in the long hole is disposed, and an engaging portion that can engage with the lock pin is provided. A clamp joint for piping, which is formed in the vicinity of a press-contact cam portion formed at a base end portion of the operation lever.   A spring is arranged between the pin attached to the tip of the pair of link plates to support the operation lever and the lock pin, and the lock pin is always urged toward the pin that supports the operation lever. The piping clamp joint according to claim 1.

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