JP2014046348A - Lock pin and connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply a lock pin allowed to rotate alone and capable of reducing man hours and a connection structure.SOLUTION: A lock pin 3 includes a head 88, and a shaft 32 connected to the head 88 and having a notched part 35 and a screw part positioned nearer to a tip side than the notched part 35. The head 88 is connected to the shaft 32, and includes a body 31 having a screw hole 50 extending in an axial direction, and an eye bolt 60 screwed into the screw hole 50 of the body 31 to be fixed to the body 31.

Description

  The present invention relates to a lock pin and a connection structure. The present invention relates to, for example, a lock pin used to connect a rolling roll of a rolling mill to a coupling connected to a driving shaft, and also connects a rolling roll of the rolling mill to a coupling connected to a driving shaft. It relates to a connecting structure.

  Conventionally, as a lock pin, there is a lock pin used in a connecting structure described in Japanese Patent Laid-Open No. 2-229607 (Patent Document 1). This lock pin is used to connect a roll of a rolling mill and a coupling attached to a drive shaft. This lock pin has a notch that is a recess in the central portion in the axial direction.

  This lock pin is inserted into the lock pin insertion hole of the coupling in a state where the notch is directed to the roll neck fitting hole side of the coupling. And in this state, a roll neck part is inserted in the roll neck fitting hole of a coupling. After that, the lock pin is rotated, and the peripheral portion of the lock pin is engaged with the engagement groove of the roll neck portion, thereby restricting the movement of the roll neck portion in the axial direction. .

  Further, in order to reliably prevent the roll neck portion from moving in the axial direction, the lock pin is prevented from rotating while the peripheral portion of the lock pin is engaged with the engagement groove of the roll neck portion. . This detent is performed by forming a protrusion on the head of the bolt of the lock pin, forming a recess corresponding to the protrusion in the coupling, and locking the protrusion to the recess. . The anti-rotation is an urging member that is not released by constantly urging the protruding portion toward the concave portion. A nut is screwed onto the tip of the lock pin.

  By the way, in the above-described conventional lock pin, when the lock pin is disengaged, an operator on the nut side at the tip of the lock pin applies the biasing force of the biasing member to the head side of the lock pin. By pressing so as to overcome, the protruding portion is pulled away from the concave portion. In this state, another worker on the head side of the lock pin rotates the lock pin with a wrench or the like to release the engagement of the lock pin.

  However, in the above conventional lock pin, in order to rotate the lock pin, two workers are required, one at each of the nut side and the head side at the tip of the lock pin, and the work man-hour is reduced. There is a problem that it takes.

JP-A-2-229607

  Therefore, an object of the present invention is to provide a lock pin and a connecting structure that can be disengaged by one person and can reduce the number of work steps.

In order to solve the above problems, the lock pin of the present invention is
A head having a locking part capable of locking the tool;
It is characterized by comprising a shaft having a notch portion and a screw portion positioned on the tip side of the notch portion, and being connected to the head portion.

  According to the present invention, since the head has the locking portion capable of locking the tool, the locking portion of the tool can be locked to the locking portion. Therefore, when the locking portion of the head is locked to the locking portion of the tool, the frictional force does not act between the lock pin head and the lock pin insertion member by pulling the tool. After that, the lock pin can be rotated by applying torque from the tool to the head. Therefore, since the lock pin can be rotated only by applying torque to the tool while one worker is pulling the tool, the number of engagement work steps using the lock pin can be reduced.

In one embodiment,
The head is
A body portion integrally formed with the shaft and having a screw hole extending in the axial direction;
An eyebolt that is screwed into the screw hole of the main body and fixed to the main body.

  According to the above embodiment, since the eyebolt is screwed into the axially extending screw hole formed in the main body portion, the tool having the umbrella-shaped locking portion on the ring-shaped head portion of the eyebolt. The locking portion can be locked. Therefore, by pulling the tool in a state where the locking portion is locked to the annular head portion of the eyebolt, a frictional force is not exerted between the lock pin head and the lock pin insertion member. After that, the lock pin can be rotated by applying torque from the tool to the ring-shaped head of the eyebolt. Therefore, since the lock pin can be rotated only by applying torque to the tool while one worker is pulling the tool, the number of engagement work steps using the lock pin can be reduced.

In one embodiment,
An engaging portion is provided for preventing the head from rotating relative to the lock pin insertion member by engaging with the lock pin insertion member.

  According to the embodiment, the lock pin can be prevented from rotating by engaging the engaging portion with the lock pin insertion member.

The connecting structure of the present invention is
A lock pin of the present invention;
The lock pin insertion member,
The lock pin insertion member is
A lock pin insertion hole for inserting the lock pin;
A shaft fitting hole that communicates with the lock pin insertion hole and extends in a direction orthogonal to the axial direction of the lock pin insertion hole;
An engaging portion that is engageable with the engaging portion and engages with the engaging portion, and the lock pin is not rotatable with respect to the lock pin insertion hole;
A shaft member fitted in the shaft fitting hole;
And an urging member that urges the lock pin in a direction in which the engagement portion engages with the engaged portion with respect to the lock pin insertion member.

  According to the present invention, the lock pin can be easily rotated by one worker, and the number of work steps for constructing the connection structure can be reduced.

  According to the present invention, it is possible to realize a lock pin and a connecting structure that can be rotated by one person and that can reduce the number of work steps.

It is a figure which shows the connection structure of the rolling roll and coupling of one Embodiment of this invention. It is a figure for demonstrating the head of a lock pin. It is a schematic diagram for demonstrating the locking structure of the lock pin which makes a lock pin non-rotatable with respect to a coupling. It is a figure which shows an example of the tool which can be used for rotating a lock pin.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a view showing a connection structure between a rolling roll 1 and a coupling 2 according to an embodiment of the present invention.

  This connection structure includes a rolling roll 1 as an example of a shaft member, a coupling 2 as an example of a lock pin insertion member, a lock pin 3, a spring member 4 as an example of an urging member, and a washer 5. The lock pin 3 includes a head 88 and a shaft 32, and the head 88 includes a main body 31 and an eyebolt 60 fixed to the main body 31. The shaft 32 is continuous with the main body 31. The shaft 32 has a notch portion 35 and a screw portion 36, the screw portion 36 is located at a tip portion opposite to the head portion 88 side of the shaft 32, and the notch portion 35 has a head portion 88 and a head portion 88. , Between the screw portion 36 and the screw portion 36. The spring member 4 is disposed so as to surround the shaft 32.

  An end of the coupling 2 on the side where the shaft 32 is fitted in the lock pin insertion hole 39 has a step portion extending outward in the radial direction, and the outer side in the axial direction from this step portion. The inner diameter of the inner peripheral surface portion is larger than the inner peripheral surface portion on the inner side in the axial direction from the stepped portion. In this way, a part of the spring member 4 surrounding the shaft 32 can be accommodated in the large diameter portion of the lock pin insertion hole 39 so that one end of the spring member 4 can obtain a reaction force from the stepped portion. I have to.

  As shown in FIG. 1, the washer 5 is disposed so as to surround the shaft 32 and is in contact with the other end of the spring member 4. The nut 6 is screwed into the screw hole of the shaft 32 to fasten the washer 5 to the head 88 side.

  The connection structure can be formed as follows, for example. Specifically, first, the lock pin 3 is inserted into the lock pin insertion hole 39 in a state where the cutout portion 35 of the lock pin 3 faces the roll neck fitting hole 41 as an example of the shaft fitting hole. Thereafter, the roll neck portion 43 of the rolling roll 1 is inserted into the roll neck fitting hole 41. Finally, by rotating the lock pin 3 by the method described in detail below, the peripheral portion 47 of the lock pin 3 is engaged with the engagement groove 48 of the roll neck portion 43, so that the roll neck portion 43 The movement in the axial direction is restricted to form a connection structure.

  FIG. 2 is a view for explaining the head 88 of the lock pin 3.

  As shown in FIG. 2, the main body 31 of the head 88 of the lock pin 3 has a screw hole 50 extending in the axial direction. The shaft portion of an eye bolt (bolt having a ring-shaped head) 60 is screwed into the screw hole 50 and tightened, and then the main body portion 31 and the eye bolt 60 are fixed by welding. In this way, the head 88 of the lock pin 3 is formed.

  As shown in FIG. 2, the lock pin 3 has a bottomed pin insertion hole 65 extending in the radial direction, and a pin 67 is inserted and fixed in the pin insertion hole 65. The pin 67 protrudes outward in the radial direction from the main body 31. The pin 67 constitutes an engaging portion of the lock pin 3.

  FIG. 3 is a schematic view for explaining a structure for preventing the lock pin 3 from rotating relative to the coupling 2. In FIG. 3, reference numeral 67 denotes a pin 67 inserted through a pin insertion hole 65 shown in FIG.

  As shown in FIG. 3, the coupling 2 has a substantially semicircular cutout 90 that substantially matches the curvature of the head of the pin 67. The notch 90 constitutes an engaged portion of the lock pin insertion member. In this embodiment, a person moves the lock pin 3 in the axial direction of the lock pin 3 in the direction indicated by the arrow A in FIG. The head of the pin 67 engaged with 90 can be pulled away from the notch 90, so that the locking of the lock pin 3 can be released.

  On the other hand, referring to FIG. 1, when a person does not apply a force to the lock pin 3, the axial force in the direction indicated by the arrow B in FIG. The head is fitted in the notch 90 so that the lock pin 3 cannot rotate with respect to the coupling 2. In this way, in the connection structure, the movement of the roll neck portion 43 in the axial direction is reliably restricted.

  The notches 90 are formed at two locations around the lock pin insertion hole 39 in the coupling 2 with a phase difference of 180 degrees. Therefore, the lock pin 3 includes an axial restriction position that restricts the axial movement of the roll neck portion 43 with respect to the coupling 2, and a shaft insertable position at which the roll neck portion 43 can be inserted into the coupling 2. Therefore, it can be prevented from rotating.

  FIG. 4 is a view showing an example of a tool that can be used to rotate the lock pin 3.

  In an umbrella handle having a shaft portion 70 and a handle portion 71, this tool extends to the end of the shaft portion 70 opposite to the handle portion 71 in a direction perpendicular to the extending direction of the shaft portion 70. An existing rod-shaped grip 72 is connected. The tool handle 71 is hooked to the ring-shaped head of the eyebolt 60 of the head 88 of the lock pin 3. The ring-shaped head of the eyebolt 60 constitutes a locking portion of the head 88. The user can release the locking of the lock pin 3 by pulling the tool grip 72 while the tool handle 71 is locked to the annular head of the eyebolt. In addition, the user rotates the handle portion 71 about the shaft portion 70 by rotating the gripping portion 72 about the shaft portion 70 in a state where the locking of the lock pin 3 is released. The ring-shaped head portion of the eyebolt locked to the handle portion 71 can be turned, and the lock pin 3 can be turned.

  According to the embodiment, since the eyebolt 60 screwed into the axially extending screw hole 50 formed in the main body 31 is provided, for example, the ring-shaped head of the eyebolt 60 has an umbrella handle. The locking part of the handle-like tool can be locked. Therefore, by pulling the tool while the locking portion is locked to the annular head portion of the eyebolt, the lock pin 3 described with reference to FIG. The lock pin 3 can be rotated by applying torque from the tool to the ring-shaped head of the eyebolt 60 in a state where the stop is released. Accordingly, since the lock pin 3 can be rotated only by applying torque to the tool while one worker is pulling the tool, the number of work steps for engagement using the lock pin 3 can be reduced. .

  Moreover, according to the said embodiment, since the lock pin 3 is provided with the pin 67 which prevents that the head 88 rotates with respect to the coupling 2 by engaging with the coupling 2, The rotation prevention can be reliably performed, and the restriction of the movement of the roll neck portion 43 in the axial direction is ensured.

  Moreover, according to the said embodiment, since a lock pin can be easily rotated with one operator, the work man-hour of construction of a connection structure can be reduced.

  In the above-described embodiment, the lock pin 3 is prevented from rotating by fitting the head of the pin 67 fixed to the lock pin 3 into the notch 90 of the coupling 2. However, according to the present invention, the surface of the lock pin head on the side of the lock pin insertion member is processed so that irregularities appear alternately in the circumferential direction, and the surface of the lock pin insertion member that contacts the surface of the head is formed. Alternatively, the lock pin may be prevented from rotating by being processed into a concavo-convex shape that engages with the concavo-convex portion and fitting the concavo-convex portion of the head surface and the concavo-convex portion of the surface of the lock pin insertion member. In the above embodiment, the lock pin 3 is prevented from rotating by engaging the protrusion with the lock pin 3 and the recess of the coupling 2. However, in the present invention, the recess is formed in the lock pin. At the same time, the lock pin may be prevented from rotating by forming a convex portion on the coupling and engaging the concave portion of the lock pin with the convex portion of the coupling. As described above, the anti-rotation mechanism may have any structure as long as the lock pin cannot be rotated relative to the lock pin insertion member.

  In the present invention, there is no need to provide a coupling detent mechanism. This is because even if there is no detent mechanism, the lock pin can be made difficult to rotate due to the frictional force. In this case, the frictional force can be prevented from working by pulling the lock pin away from the coupling.

  In the above embodiment, the eyebolt 60 is configured to be welded to the main body 31 after being screwed into the screw hole 50 of the main body 31 and tightened. It only needs to be screwed into the screw hole and tightened. In this case, it goes without saying that the rotation direction of the tool is limited to the direction that coincides with the tightening direction of the eyebolt to the main body.

  In the above embodiment, the head 88 of the lock pin 3 is constituted by the main body 31 connected to the shaft 32 and the eyebolt 60 screwed into the screw hole 50 of the main body 31. Was composed of a ring-shaped head of the eyebolt 60. However, in the present invention, one end portion or both end portions of the U-shaped metal member are fixed to the end surface on the axially outer side of the head of the known lock pin described in Patent Document 1 by welding or the like. Alternatively, the head of the lock pin of the present invention may be formed by fixing a hook member by welding or the like to the axially outer end surface of the head of the known lock pin. Moreover, in this invention, the head of a lock pin can also be formed by screwing the hook member which has an external thread in an axial part in the screw hole of a main-body part.

  In addition, it goes without saying that the lock pin of the present invention can be used in applications other than a coupling structure in which a rolling roll of a rolling mill is coupled to a coupling coupled to a drive shaft.

DESCRIPTION OF SYMBOLS 1 Roll roll 2 Coupling 3 Lock pin 4 Spring member 31 Main body part of lock pin head 32 Lock pin shaft 35 Lock pin notch part 36 Pin part of lock pin 39 Lock pin insertion hole 41 of coupling 41 Roll neck fitting hole 50 Screw hole in the main body of the head 60 Eye bolt in the head of the lock pin 67 Pin inserted and fixed in the pin insertion hole of the lock pin 88 Head of the lock pin 90 Coupling notch

Claims (4)

A head having a locking part capable of locking the tool;
A lock pin comprising: a shaft having a notch portion and a screw portion located on a tip side of the notch portion, and being continuous with the head portion. The lock pin according to claim 1,
The head is
A body portion integrally formed with the shaft and having a screw hole extending in the axial direction;
A lock pin having an eyebolt screwed into the screw hole of the main body and fixed to the main body. The lock pin according to claim 1 or 2,
A lock pin comprising an engaging portion for preventing the head from rotating relative to the lock pin insertion member by engaging with the lock pin insertion member. A lock pin according to claim 3;
The lock pin insertion member,
The lock pin insertion member is
A lock pin insertion hole for inserting the lock pin;
A shaft fitting hole that communicates with the lock pin insertion hole and extends in a direction orthogonal to the axial direction of the lock pin insertion hole;
An engaging portion that is engageable with the engaging portion and engages with the engaging portion, and the lock pin is not rotatable with respect to the lock pin insertion hole;
A shaft member fitted in the shaft fitting hole;
And a biasing member that biases the lock pin with respect to the lock pin insertion member in a direction in which the engaging portion engages with the engaged portion.

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