JP2014047864A - Lock pin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lock pin that enables rotation by one worker and can reduce working man-hour.SOLUTION: A notch part 35 and a screw 36 positioned on a tip side with respect to the notch part 35 are formed in a shaft 32 of a lock pin 3. A through hole 50 penetrating a head part 31 and the shaft 32 in an axial direction is formed to the lock pin 3. A communication port opening in the axial direction and communicating with the through hole 50 is provided to the end surface of the shaft 32 of the lock pin 3, and a groove extending in a direction substantially vertical to the axial direction from the communication port is formed.

Description

  The present invention relates to a lock pin, for example, a lock pin used for connecting a rolling roll of a rolling mill to a coupling connected to a drive shaft.

  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 that can be disengaged by one person and can reduce work man-hours.

In order to solve the above problems, the lock pin of the present invention is
The head,
A shaft having a notch portion and a screw portion located on the front end side of the notch portion, connected to the head portion,
A through hole that is positioned at an interval in the notch and that penetrates the head and the shaft in the axial direction;
A groove that extends from the communication port in a direction substantially perpendicular to the axial direction, and has a communication port that communicates with the through-hole, and is located on the end surface of the shaft and opens in the axial direction. It is characterized by.

  In order to rotate the lock pin of the present invention, first, the following tool is prepared. Specifically, a shaft portion having a dimension longer than that of the through hole and capable of penetrating the through hole, and a groove fitting portion that extends from the shaft portion in the vertical direction of the shaft portion and can be accommodated in the groove. An integrated first tool having the following is prepared. Moreover, the 2nd tool which has a grip part which can hold | grip an axial part, and a handle part which can rotate the axial part which the grip part grasped is prepared.

  Then, the shaft portion of the first tool is inserted into the through hole from the shaft side of the lock pin of the present invention, and the groove fitting portion of the first tool is fitted into the groove of the lock pin. In this state, after gripping the tip end portion of the shaft portion of the first tool protruding from the head side of the lock pin with the grip portion of the second tool, the handle portion of the second tool is pulled to Apply axial force to the groove of the lock pin from the groove fitting part and move the lock pin in the axial direction so that frictional force does not work between the head of the lock pin and the lock pin insertion member. To do. In this state, the handle portion is operated to rotate the shaft portion of the first tool, so that torque is applied from the groove fitting portion of the first tool to the groove of the lock pin to rotate the lock pin. Make it move.

  According to the present invention, one worker inserts the shaft portion of the first tool into the through hole from the shaft side of the lock pin of the present invention, and the groove fitting portion of the first tool is locked to the lock. After fitting into the groove of the pin, the lock pin can be rotated simply by gripping the tip end of the shaft portion of the first tool with the grip portion of the second tool, pulling it and rotating it. Therefore, the lock pin can be rotated by one person, and the number of work steps can be reduced.

In one embodiment,
The groove is composed of one linear groove.

  According to the above embodiment, since the shaft groove of the lock pin consists of a single straight groove, the lock pin can be manufactured easily and inexpensively, and the structure of the first tool can be simplified. The first tool can be manufactured easily and inexpensively.

  According to the present invention, it is possible to realize a lock pin 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 schematic diagram when the end surface of the axial direction of the axial part of a lock pin is seen from the outward side of an axial direction. 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 the 1st tool used in order to rotate 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, a coupling 2, a lock pin 3, a spring member 4, a washer 5, and a nut 6, and the lock pin 3 has a head portion 31 and a shaft 32. . The shaft 32 is continuous with the head 31. The shaft 32 has a notch 35 and a threaded portion 36, the threaded portion 36 is located at the tip of the shaft 32 opposite to the head 31 side, and the notch 35 is connected to the head 31. , Between the screw portion 36 and the screw portion 36. The lock pin 3 has a through hole 50 that penetrates the head portion 31 and the shaft 32 in the axial direction. The through hole 50 is located at a distance from the notch 35.

  As shown in FIG. 1, the lock pin 3 has a bottomed pin insertion hole 65 extending in the radial direction and a pin 67, and the pin insertion hole 65 straddles the head 31 and the shaft 32. Existing. The pin 67 is inserted into the pin insertion hole 65 and fixed to the pin insertion hole 65. The pin 67 protrudes outward in the radial direction from the head 31.

  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 is screwed into the screw hole of the shaft 32 to fasten the washer 5 to the head 31 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 with the notch 35 of the lock pin 3 facing the roll neck fitting hole 41 side. 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 schematic view of the end face 52 in the axial direction of the shaft 32 of the lock pin 3 as viewed from the outer side in the axial direction.

  As shown in FIG. 2, the lock pin 3 has one linear groove 55 on the axial end surface 52 of the shaft 32. The groove 55 is open outward in the axial direction. The groove 55 passes through the center of the substantially circular end surface 52 in the axial direction of the shaft 32. The groove 55 has a communication port 56 that communicates with the through hole indicated by reference numeral 50 in FIG. As shown in FIG. 2, the center of the communication port 56 exists at a position spaced from the center of the substantially circular end surface 52 in the axial direction of the shaft 32.

  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. 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 the first tool 80 used for rotating the lock pin 3 of the embodiment.

  As shown in FIG. 4, the first tool 80 is an integral tool and has a T-shaped bar shape. The first tool 80 includes a shaft portion 60 and a groove fitting portion 61, and the groove fitting portion 61 is connected to the shaft portion 60. The shaft portion 60 has a longer dimension than the through hole indicated by reference numeral 50 in FIG. The cross section of the shaft portion 60 is smaller than the cross section of the through hole 50. The shaft portion 60 can penetrate the through hole 50.

  On the other hand, the groove fitting portion 61 extends in a direction perpendicular to the extending direction of the shaft portion 60. The groove fitting portion 61 extends on a straight line. The groove fitting portion 61 can be accommodated in the groove 55 (see FIG. 2) of the shaft portion 60.

  In the above structure, in this connection structure, the lock pin 3 is rotated as follows.

  Specifically, first, a second tool described below is prepared in addition to the first tool 80 described in FIG. Specifically, the second tool includes a grip portion that can grip the shaft portion, and a handle portion that can rotate the shaft portion gripped by the grip portion. Here, the grip part of the second tool can be constituted by a known chuck or the like. In the second tool, a shaft portion extending in a direction perpendicular to the handle from the center of the handle is connected to the grip portion.

  Next, the shaft portion 60 of the first tool 80 is inserted into the through hole 50 from the shaft 32 side of the lock pin 3, and the groove fitting portion 61 of the first tool 80 is inserted into the groove 55 of the lock pin 3 (FIG. 2). (See). In this state, after gripping the tip portion of the shaft portion 60 of the first tool 80 protruding from the head 31 side of the lock pin 3 with the grip portion of the second tool, the handle portion of the second tool is pulled, An axial force is applied from the groove fitting portion 61 of the first tool 80 to the groove 55 of the lock pin 3, and the lock pin 3 is moved in the axial direction to release the locking structure of the lock pin 3 shown in FIG. To do.

  In this state, the handle portion of the second tool is operated to rotate the shaft portion 60 of the first tool 80, so that the groove fitting portion 61 of the first tool 80 moves to the groove 55 of the lock pin 3. Torque is applied to rotate the lock pin 3.

  According to the above embodiment, one worker inserts the shaft portion 60 of the first tool 80 into the through hole 50 from the shaft 32 side of the lock pin 3 and the groove fitting portion 61 of the first tool 80. After the engagement with the groove 55 of the lock pin 3, the tip of the shaft portion 60 of the first tool 80 is gripped by the grip portion of the second tool, pulled, and rotated to rotate the lock pin 3. Can be moved. Therefore, the lock pin 3 can be rotated by one person, and the number of work steps can be reduced.

  Further, according to the above embodiment, since the groove of the shaft 32 of the lock pin 3 is composed of a single straight groove 55, the lock pin 3 can be manufactured easily and inexpensively, and the structure of the first tool 80 is also provided. The first tool 80 can be easily and inexpensively manufactured.

  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.

  Moreover, in the said embodiment, although the shape of the groove | channel 55 formed in the end surface 52 of the axis | shaft 32 of the lock pin 3 was a simple linear shape, in this invention, the groove | channel formed in the end surface of the axis | shaft of a lock pin is Any groove may be used as long as it is an integral groove having no discrete portion. For example, the groove formed in the end face of the shaft of the lock pin may have a plurality of linear portions extending radially, may be wavy, U-shaped, J-shaped, A square shape or the like may be used. In short, the groove formed on the end surface of the shaft of the pin is located on the end surface of the shaft of the lock pin and opens in the axial direction, and has a communication port communicating with the through hole of the lock pin. Any shape can be used as long as it extends in a direction substantially perpendicular to the axial direction. Needless to say, the first tool having the shaft portion penetrating the through hole has a groove fitting portion having a shape corresponding to the groove of the lock pin.

  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.

3 Lock Pin 31 Lock Pin Head 32 Lock Pin Shaft 35 Lock Pin Notch 36 Lock Pin Thread 50 Lock Pin Through Hole 55 Lock Pin Groove 56 Lock Pin Groove Communication Port

Claims (2)

The head,
A shaft having a notch portion and a screw portion located on the front end side of the notch portion, connected to the head portion,
A through hole that is positioned at an interval in the notch and that penetrates the head and the shaft in the axial direction;
A groove that extends from the communication port in a direction substantially perpendicular to the axial direction, and has a communication port that communicates with the through-hole, and is located on the end surface of the shaft and opens in the axial direction. Lock pin characterized by. The lock pin according to claim 1,
The lock pin is formed of a single linear groove.

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