JP4570161B2 - Chain structure - Google Patents

Description

  The present invention relates to a chain structure used for, for example, a screen device for removing dust from a cooling water intake of a power plant.

  As a conventional chain structure used for, for example, a screen device for removing living things such as jellyfish and drifting debris in the water of a water intake for cooling of a power plant, there is a structure shown in FIG. In the chain structure 10 shown in the figure, the end portions of the link plates 11 and 12 that are adjacent to each other and are each paired are connected to each other via a connecting pin 14 so as to be rotatable.

  In each of the pair of link plates 12 inside the connecting portion of the chain structure 10, the outer peripheral portions of both ends of the pin bushing 16 whose inner peripheral portion is loosely fitted to the connecting pin 14 are firmly fitted by press fitting or the like. An inner peripheral portion of a roller bushing 20 that is integrally fixed to an inner peripheral portion of the roller 18 is rotatably fitted to the outer peripheral portion of the pin bushing 16.

  However, since such a conventional chain structure is used for a screen device or the like that removes dust or the like from a cooling water intake of a power plant, it reciprocates between water and air.

  For this reason, since the roller 18 rotates around the pin bush 16 together with the roller bush 20 while receiving water pressure in water, the roller bush 20 is deformed due to the pressure load of the water pressure, and a phase difference is generated between the roller 18 and the roller 18. For this reason, during operation of a dedicated conveyor or the like using the chain structure 10, the roller bush 20 can slide relative to the roller 18 and rotate relatively, or move relatively in the axial direction and come off. It becomes a state.

  Then, the end surface of the roller bush 20 contacts one of the pair of link plates 12, and the end surface of the roller 18 opposite to the contact end of the roller bush 20 with one of the link plates 12 contacts the other of the pair of link plates 12. There is a problem in that the rotation of the roller 18 is caused to occur while the rotation of the roller 18 is suppressed, resulting in a rotation failure phenomenon.

  Therefore, in view of the above problems, an object of the present invention is to provide a chain structure that can reliably prevent the occurrence of a roller rotation failure phenomenon.

In order to solve the above problems, the present invention
In the chain structure in which the roller bush is integrally provided on the inner peripheral portion of the roller rotatably provided on the outer periphery of the pin bush provided on the outer periphery of the connecting pin for connecting the link plate,
By fitting the roller bushing to the inner peripheral part of the roller by inserting the roller bushing along the axial direction of the inner peripheral part of the roller,
Each of a pair of annular stepped bushes is fitted and provided in each of a pair of annular grooves formed on the inner peripheral portion of each of both ends of the roller,
A concave step is formed on the outer periphery of each end of the roller bush,
On the inner peripheral portion of the outer end portion of the stepped bush, a convex step portion that engages with the concave step portion is formed .

Further, in order to solve the above problems, the present invention
In the chain structure in which the roller bush is integrally provided on the inner peripheral portion of the roller rotatably provided on the outer periphery of the pin bush provided on the outer periphery of the connecting pin for connecting the link plate,
By fitting the roller bushing to the inner peripheral part of the roller by inserting the roller bushing along the axial direction of the inner peripheral part of the roller,
An annular stepped bush is fitted into an annular groove formed in the inner peripheral portion of one end of the roller,
A concave step is formed on each outer peripheral portion of both ends of the roller bush,
On the inner peripheral portion of the outer end portion of the stepped bush, a convex step portion that engages with one of the concave step portions is formed,
A convex step portion that engages with the other of the concave step portions is formed on the inner peripheral portion of the other end portion of the roller .

  According to the chain structure of the present invention, the roller bush is provided with a means for preventing the roller bush from coming out even when the roller bush is displaced in the axial direction relative to the roller or relatively in the circumferential direction. It is possible to reliably prevent the occurrence of the rotation failure phenomenon.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
FIG. 1 is a view referred to for explaining a first embodiment of a chain structure according to the present invention.

  In the roller 18A shown in FIG. 1, an annular stepped bush 22 is press-fitted between each end portion of the roller bush 20A and the corresponding portion of the roller 18A, and the step portion 22a of the stepped bush 22 has. (Corresponding to the convex step portion) is engaged with the step portion 20a (corresponding to the concave step portion) of the roller bush 20A.

  In the first embodiment, the stepped portion 22a of the stepped bush 22 is engaged with the stepped portion 20a of the roller bushing 20A (prevention means), so that the roller bushing 20A is displaced in the axial direction of the roller 18A. Since it is possible to prevent the roller 18A from slipping out little by little, it is possible to reliably prevent the rotation failure of the roller 18A. According to the first embodiment, the conventionally used roller 18 and roller bush 20 can be reworked and reused.

  FIG. 2 is a diagram referred to for explaining the second embodiment of the present invention. In the first embodiment, the stepped bush 22 is disposed at both ends of the roller bush 20A, whereas in the second embodiment, a step is provided between one end of the roller bush 20B and the roller 18B. The bush 22 is press-fitted and the step 18a (corresponding to a convex step) is integrally formed on the roller 18B on the other end side of the roller bush 20B.

  In such a second embodiment, the stepped portion 20a of the stepped bush 22 is engaged with the stepped portion 20a of the one end portion of the roller bushing 20B (disengagement preventing means), and the stepped portion of the other end portion of the roller bushing 20B is engaged. By engaging the step portion 18a of the roller 18B with the roller 20B (disengagement preventing means), it is possible to reliably prevent the roller bush 20B from being displaced little by little in the axial direction of the roller 18B.

  FIG. 3 is a diagram referred to for explaining the third embodiment of the present invention. In the third embodiment, a step 18a is formed on the roller 18C on one end side of the roller bush 20C, and a crimping portion 24a of the roller 18C is formed on the other end side of the roller bush 20C.

  The roller 18C is initially formed with a protrusion 24b. After the roller bush 20C is assembled into the inner periphery of the roller 18C, the protrusion 24b is crushed by pressurizing the protrusion 24b with a press or the like, and the caulking portion 24a is formed. The pressing surface (outer surface) of the crimping portion 24a is formed so as not to protrude outward from the end surfaces of the roller 18C and the roller bush 20C.

  The caulking portion 24a and the protrusion 24b may be formed in a ring shape continuously in the circumferential direction of the roller bushing 20C, or they may be provided at 2 to 4 locations at intervals in the circumferential direction. You may make it divide | segment into several and form.

  In the third embodiment, the step 18a of the roller 18C is engaged with the step 20a at one end of the roller bush 20C (preventing means), and the step 20a at the other end of the roller bush 20C is engaged. Since the caulking portion 24a is engaged (disengagement preventing means), it is possible to reliably prevent the roller bush 20C from being displaced little by little in the axial direction of the roller 18C.

  FIG. 4 is a diagram referred to for explaining the fourth embodiment of the present invention. In the fourth embodiment, each of a pair of grooves 26 is formed in the inner peripheral portion of the roller 18D corresponding to both end portions of the roller bush 20D. Each of the rings 28 is fitted.

  The elastic locking ring 28 is separated from each other in a part in the circumferential direction, and a pair of locking holes 28a are formed at both ends of the elastic locking ring 28 separated from each other. Then, the diameter of the elastic ring 28 is reduced by inserting a tip of a tweezer (a tool) into the locking hole 28a and applying a force to reduce the distance between the pair of locking holes 28a. When the force is released, the elastic ring 28 is increased in diameter by the elastic restoring force and is engaged with the groove 26.

  In such a fourth embodiment, the roller bush 20D is displaced in the axial direction of the roller 18D by causing both ends of the roller bush 20D to come into contact with and engage with each of the elastic locking rings 28 (disengagement preventing means). It can be surely prevented from going out little by little.

  FIG. 5 is a diagram referred to for explaining the fifth embodiment of the present invention. In the fifth embodiment, two knock pins 30 (driving pins) are inserted between the roller bushes 20E and the rollers 18E at each of both ends of the roller bush 20E. It should be noted that the number of knock pins 30 inserted into each end of the roller bush 20E need not be limited to two, and any number may be inserted. Moreover, you may use the other member which has the function similar to a knock pin, such as a screw pin.

  In such a fifth embodiment, the knock pin 30 is driven between the roller bush 20E and the roller 18E (prevention means), so that the roller bush 20E is displaced little by little in the axial direction of the roller 18E. And the roller bushing 20E is prevented from rotating with respect to the roller 18E. That is, it is possible to prevent the contact surface between the roller bush 20E and the roller 18E from being damaged.

  FIG. 6 is a diagram referred to for explaining the sixth embodiment of the present invention. In the sixth embodiment, a knurled surface 32 by knurling (frictional force increasing processing) is formed on the peripheral surfaces of both ends of the hole 18b into which the roller bushing is fitted of the roller 18F.

  The knurled surface 32 rotates the roller 18F while rotating the roller 18F and presses a roller-shaped knurled tool (not shown) having a diameter smaller than the hole 18b of the roller 18F against the peripheral surface of the hole 18b. By processing by rotating integrally, a knurled surface 32 having the same pattern as the mesh or the like formed on the peripheral surface of the hard knurled tool is formed by pressure transfer to the peripheral surface of the hole 18b. However, the pattern of the mesh or the like is formed by the recess of the groove and the bulge around the groove.

  Since the friction coefficient of the peripheral surface of the hole 18b can be remarkably increased by the knurled surface 32 formed in this way (prevention means), the displacement of the roller bushing in the axial direction and the circumferential direction with respect to the roller 18F is surely prevented. can do.

  Although the embodiments of the present invention have been specifically described above, the present invention is not limited to the above-described embodiments, and various other modifications can be made based on the technical idea of the present invention. It is possible.

It is sectional drawing of the roller 18A which concerns on 1st Embodiment of the chain structure by this invention. It is sectional drawing of the roller 18B which concerns on the 2nd Embodiment of this invention. It is sectional drawing of the roller 18C which concerns on the 3rd Embodiment of this invention. It is a figure which shows roller 18D which concerns on the 4th Embodiment of this invention, Fig.4 (a) is the sectional drawing, FIG.4 (b) is the front view. It is a figure which shows the roller 18E which concerns on the 5th Embodiment of this invention, Fig.5 (a) is the sectional drawing, FIG.5 (b) is the front view. It is sectional drawing of the roller 18F which concerns on the 6th Embodiment of this invention. It is sectional drawing of the connection part of the conventional chain structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Chain structure 11,12 Link plate 14 Connecting pin 16 Pin bushing 18, 18A-18F Roller 18a Step part 18b Hole 20, 20A-20E Roller bush 20a Step part 22 Stepped bush 22a Step part 24a Caulking process part 24b Protrusion 26 Groove 28 Elasticity Locking ring 28a Locking hole 30 Knock pin 32 Knurled surface

Claims (2)

In the chain structure in which the roller bush is integrally provided on the inner peripheral portion of the roller rotatably provided on the outer periphery of the pin bush provided on the outer periphery of the connecting pin for connecting the link plate,
By fitting the roller bushing to the inner peripheral part of the roller by inserting the roller bushing along the axial direction of the inner peripheral part of the roller,
Each of a pair of annular stepped bushes is fitted and provided in each of a pair of annular grooves formed on the inner peripheral portion of each of both ends of the roller,
A concave step is formed on the outer periphery of each end of the roller bush,
The chain structure characterized by the convex step part engaged with the said concave step part being formed in the inner peripheral part of the outer side edge part of the said stepped bush . In the chain structure in which the roller bush is integrally provided on the inner peripheral portion of the roller rotatably provided on the outer periphery of the pin bush provided on the outer periphery of the connecting pin for connecting the link plate,
By fitting the roller bushing to the inner peripheral part of the roller by inserting the roller bushing along the axial direction of the inner peripheral part of the roller,
An annular stepped bush is fitted into an annular groove formed in the inner peripheral portion of one end of the roller,
A concave step is formed on each outer peripheral portion of both ends of the roller bush,
On the inner peripheral portion of the outer end portion of the stepped bush, a convex step portion that engages with one of the concave step portions is formed,
A chain structure in which a convex step portion that engages with the other of the concave step portions is formed on an inner peripheral portion of the other end portion of the roller .

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