JP5991197B2 - Thrust clamp of rolling mill - Google Patents

Description

  The present invention relates to an annular thrust clamp that functions as a retaining from a roll chock in a roll that is rotatably held by a roll chock of a rolling mill.

The work roll of the rolling mill and the backup roll that supports this work roll are taken out of the rolling mill and subjected to maintenance if troubles occur regularly or due to wear or rough surface of the roll. Then, it is incorporated into the rolling mill again.
In the maintenance of such a roll, normally, the roll chock that rotatably holds the roll is taken out from the rolling mill, and the roll is removed from the roll chock and replaced with another roll that has already been maintained. ing.

Also, when replacing the roll with respect to the roll chock, it is necessary to remove the annular thrust clamp that functions as a retainer from the roll chock of the roll by fitting it into an annular groove provided around the axis on the roll shaft end side. Become.
As this thrust clamp, for example, as shown in FIG. 6 (a), a pair of semicircular arc-shaped arm members 31, 31 fitted in the annular groove, and base ends of these arm members 31, 31 are used. Are provided with connecting members 32 respectively connected to both ends in the longitudinal direction. In addition, a key groove 35 into which a detent key 34 disposed between the outer peripheral surface of the roll shaft 33 is fitted is formed at the center of the portion corresponding to the inner peripheral surface side of the arm member in the connecting member 32. Thus, the base end portions of the pair of arm members are rotatably connected to both end sides of the key groove 35.
Then, as shown in FIG. 6 (b), the inner peripheral surface side of the thrust clamp 1 can be closed or opened by bringing the tip ends of the pair of arm members 31 and 31 into contact with and away from each other. The roll shaft 33 can be inserted or removed.

Here, when the thrust clamp is removed, the thrust clamp is a very heavy one that is close to about 1 t. Therefore, the thrust clamp needs to be pulled out from the annular groove of the roll shaft 3 using a hoist such as a crane.
At this time, the thrust clamp cannot be removed from the roll shaft 33 unless the key groove 35 of the connecting member 32 is removed from the key 34. For example, when the key 34 is located on the side of the roll shaft 33, In addition, the weight of the thrust clamp is concentrated on the connecting member 32, and the key groove 35 of the thrust clamp is moved in the direction connecting the key groove 35 and the axis of the roll shaft 33. Since it is necessary to pull out the key groove 35 from the key 34, it is very difficult to pull out the key groove 35 from the key 34 even if a hoist is used.
Therefore, as shown in FIG. 6C, the roll shaft 33 is in a state in which the key 34 is positioned at the uppermost position, and the tip end sides of the pair of arm members 31 and 31 in the thrust clamp are separated and opened. The actual situation is that the thrust clamp must be properly pulled out in accordance with the direction of the key 34.
However, it is very troublesome to make the roll shaft 33 in the state where the key 34 is located at the uppermost part every time maintenance is performed, and the position of the connecting member 32 is also higher as the key 34 is located at the uppermost part of the roll shaft 33. Therefore, there is a problem that work at a high place is unavoidable, and this causes a high risk of work, and the work itself requires skilled skills and takes time.

On the other hand, when the thrust clamp is attached to the annular groove of the roll shaft, the ends of the pair of arm members are connected using bolts and nuts so as not to be separated. Therefore, the bolts and nuts of the thrust clamp may be loosened due to the vibration.
If it does so, the front end side of a pair of arm member may mutually space apart, there exists a possibility that the inner peripheral surface side of a thrust clamp may be open | released, and there existed a possibility that the worst thrust clamp might fall from a roll axis | shaft.

Moreover, as a thrust clamp other than the one shown in FIG. 6, for example, the one described in Patent Document 1 exists, but in the thrust clamp described in Patent Document 1, a pair of arm members are arranged at one end side of each arm member. In addition to being connected at one point, a key groove is formed in a substantially intermediate portion on the inner peripheral surface side of each arm member.
However, in the case of the thrust clamp of this Patent Document 1, since it is necessary to pull out the key groove from the key in a state where the connecting portion of the pair of arm members is at the bottom, the position management of the roll shaft is also troublesome. Pulling the keyway out of the key with the connecting portion at the bottom is a very difficult task even if a hoist is used, so there is a problem that it takes time to remove the thrust clamp.
In addition, since no measures are taken against the loosening of the bolts and nuts connecting the tip ends of the pair of arm members due to vibration during operation of the rolling mill, the tip sides of the pair of arm members are separated from each other, There is still a possibility that the thrust clamp will fall off the roll shaft.

Japanese Utility Model Publication No. 57-122708

  The technical problem of the present invention is that when removing from the roll shaft, it can be easily and reliably removed regardless of the position of the key on the roll shaft. Another object of the present invention is to provide a thrust clamp that can be stably attached and prevented from falling off.

In order to solve the above-mentioned problem, the thrust clamp of the rolling mill of the present invention is fitted in an annular groove provided around the axis on the roll shaft end side of the roll rotatably held by the roll chock of the rolling mill, In the annular thrust clamp that functions as a retaining from the roll chock of the roll,
A pair of arm members that are formed in a semicircular arc shape and are fitted into the annular groove;
A connecting portion that connects the pair of arm members to each other at one point on the base end side of the pair of arm members so that the distal end sides of the arm members can contact and separate from each other ;
An engagement groove that can be engaged with a locking plate attached to the roll chock to lock the pair of arm members to the roll chock is provided on the outer peripheral surface side of the pair of arm members ,
Further, the pair of arm members have a single key groove into which an anti-rotation key disposed between the inner peripheral surface side and the outer peripheral surface side of the roll shaft is fitted. The groove is formed by a pair of notches provided on the base end side of each of the pair of arm members, and the groove width on the opening side is expanded and contracted by contact and separation of the distal end side of each arm member. It is.

  In the present invention, the connecting portion is biased toward the outer peripheral surface side of each arm member at one shaft member extending in the direction along the axial direction of the roll and the end surfaces on the proximal end side of the pair of arm members. And each of the connecting protrusions is connected to each other by a shaft member so as to be rotatable around the axis of the shaft member. The protrusions may be formed by notches formed on the inner peripheral surface side of each arm member on the end surface on the proximal end side of each arm member.

  According to the present invention, the pair of arm members are connected at one point on the proximal end side of each arm member so that the distal end sides can be brought into contact with and separated from each other and disposed between the outer peripheral surface of the roll shaft. The key groove into which the anti-rotation key is inserted is formed by a pair of notches provided on the base end side of the pair of arm members, and the groove on the opening side is brought into contact with and separated from the distal end side of each arm member Since the width is reduced and expanded, it is easy to pull out the keyway from the key. As a result, the key groove can be pulled out relatively easily regardless of the position of the key of the roll shaft, so that the thrust clamp can be easily detached from the roll shaft in a short time.

  Further, at the time of mounting on the roll shaft, the locking plates attached to the roll chock are engaged with the respective engaging grooves provided on the outer peripheral surfaces of the pair of arm members, thereby Separation of the distal end side can be prevented. Therefore, even if the connection between the tip ends of the pair of arm members is released, the thrust clamp can stably maintain the state of being attached to the roll shaft, so that it is reliably prevented from falling off the roll shaft. be able to.

It is a front view showing typically one embodiment of the thrust clamp of the rolling mill concerning the present invention. However, it shows the state attached to the roll axial direction positioning device provided in the roll chock It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. However, the roll axis is omitted. It is a front view which shows typically the state which opened the thrust clamp. It is a front view which shows typically the state which removes a thrust clamp from a roll axis | shaft. It is a front view which shows the conventional thrust clamp typically. However, (a) in a state where it is attached to the roll shaft, (b) in a state where the key and the key groove are fitted, a state in which the distal ends of the pair of arm members are opened, and (c) a thrust clamp above the roll shaft. Each pulled out state is shown.

  1 to 5 show an embodiment of a thrust clamp of a rolling mill according to the present invention, and the thrust clamp 1 of this embodiment is rotatably held by a roll chock (not shown) of the rolling mill. A substantially circular ring that fits into an annular groove 3a provided around the axis on the shaft end side of the roll shaft 3 of various rolls such as work rolls and backups, and functions as a retainer from the roll chock of the roll shaft 3 It is formed.

In this embodiment, a case will be described in which the thrust clamp 1 is attached to the roll shaft 3 held by the roll axial direction positioning device 2 provided in the roll chock.
First, the roll axial direction positioning device 2 will be described with reference to FIG. In FIG. 2, reference numeral 4 denotes an annular piston that is inserted into the roll shaft 3 and is used for fixing the position of the roll shaft 3, and moves forward and backward in the axial direction of the roll shaft 3 by hydraulic pressure, and reference numeral 5 denotes the piston 4. A cylinder body that forms a pressure chamber 6 between them, 7 is a cylinder cap that closes one end of the pressure chamber 6 of the cylinder body 5, and 8 is screwed onto the outer peripheral surface of the piston 4. A lock nut 9 for fixing the position is a square bar-like key fixed to the inner peripheral surface of the piston.
These piston 4, cylinder body 5, cylinder cap 7, lock nut 8, key 9 and the like rotate together with the roll shaft 3.

The thrust clamp 1 includes a pair of arm members 10 and 11 that are fitted into the annular groove 3a, and a connecting portion 12 that connects the pair of arm members 10 and 11 to each other at the base end sides 10a and 11a. And.
Further, on each outer peripheral surface side of the pair of arm members 10, 11, a locking plate attached to the roll chock to lock the pair of arm members 10, 11 to the roll chock positioning device 2. Engagement grooves 13, 14 that engage with 28 are provided in the pair of arm members 10, 11, respectively, and the roll shaft 3 is formed on the inner peripheral surface side of the pair of arm members 10, 11. A single keyway 15 is formed in which the key 9 for preventing rotation disposed on the outer peripheral surface side is inserted.

Each of the pair of arm members 10 and 11 is a plate having a thickness and a predetermined width (a length between the inner peripheral surface side and the outer peripheral surface side) that can ensure a predetermined rigidity. Are formed in a substantially semicircular shape when viewed from the front, and are configured to be substantially annular by bringing the base end sides 10a, 11a and the tip ends 10b, 11b of the arm members into contact with each other.
In addition, when these base member side 10a, 11a and base end side 10a, 11a and tip end side 10b, 11b contact | abut, it becomes an annular | circular shape, and an inner peripheral surface side is the said roll member. The inner diameter is set to be substantially the same as the outer diameter of the groove bottom of the annular groove 3 a of the shaft 3, while the outer peripheral surface side is set to be smaller than the outer diameter of the lock nut 8. Further, as shown in FIGS. 1 and 2, each arm member 10, 11 is attached to the piston for supplying and discharging oil for driving the piston with respect to the pressure chamber 6 of the roll axial direction positioning device 2. Recesses 16 and 17 having a substantially C-shape in front view for exposing the joints 4a and 4b are provided so that the pair of arm members 10 and 11 do not hinder the oil supply / discharge operation.

Further, in this embodiment, connecting projections 18 and 19 constituting a part of the connecting portion 12 are formed on the base end sides 10a and 11a of the pair of arm members 10 and 11, respectively. By connecting the connecting projections 18 and 19 of the arm members 10 and 11, the pair of arm members 10 and 11 are connected to each other at the base end sides 10a and 11a.
More specifically, the connecting protrusions 18 and 19 are formed at portions of the end surfaces of the base end sides 10a and 11a of the pair of arm members 10 and 11 that are biased toward the outer peripheral surfaces of the arm members 10 and 11, respectively. The arm members 11 and 10 are disposed so as to face the connecting protrusions 19 and 18 and protrude in the circumferential direction of the arm members 10 and 11. Then, in a state in which both of the connecting projections 18 and 19 are overlapped, the shaft members 20 described later are passed through in the thickness direction (the front-rear direction in FIG. 1 and the left-right direction in FIG. 2) to be connected to each other. It has become.
In this embodiment, as shown in FIG. 2, the connecting projections 18 of one arm member (the right arm member 10 in FIG. 1) are provided on both end surfaces of the arm member 10 in the thickness direction. The connecting protrusion 19 of the other arm member (the left arm member 11 in FIG. 1) is arranged at the center in the thickness direction of the arm member 11 to connect one arm member 10. In this embodiment, the connecting protrusion 19 of the other arm member 11 is inserted between the protrusions 18.

The connecting portion 12 is configured so that the pair of arm members 10 and 11 are connected to and separated from each other so that the distal end sides 10b and 11b of the arm members 10 and 11 can be contacted and separated from each other. The end sides 10a and 11a are connected to each other at one point. Thereby, as shown in FIG.1 and FIG.4, the space between the front end sides 10b and 11b of a pair of arm members 10 and 11 is closed, and the inner peripheral surface side of a pair of arm members 10 and 11, ie, The space on the inner peripheral surface side of the thrust clamp 1 is closed or opened so that the roll shaft 3 can be attached or detached.
In this embodiment, the connecting portion 12 has a single rod-like shape extending in the direction along the axial direction of the roll shaft 3, that is, in the thickness direction of the pair of arm members 10 and 11 (the front-rear direction in FIG. 1). The shaft member 20 and the connection protrusions 18 and 19 projecting from the base end sides 10a and 11a of the pair of arm members 10 and 11 described above, respectively. Reference numeral 19 denotes a structure in which the shaft member 20 is connected to each other so as to be rotatable around the axis of the shaft member 20. Therefore, the pair of arm members 10 and 11 are rotated around the axis of the shaft member 20 around the shaft member 20, so that the distal end sides 10b and 11b of the arm members 10 and 11 are brought into contact with and separated from each other. Thus, the space between the tip ends 10b and 11b is closed and opened.

When the thrust clamp 1 is attached to the annular groove 3a of the roll shaft 3, the tip sides 10b, 11b of the arm members 10, 11 are provided on the tip sides 10b, 11b of the pair of arm members 10, 11. A coupling means 21 is provided for coupling the two to prevent separation.
In the coupling means 21 of this embodiment, a thread is formed at the distal end portion of the outer peripheral surface provided on the outer peripheral surface side of the distal end side 10b of one arm member (the right arm member 10 in the case of FIG. 1). On the outer peripheral surface of the front end side 11b of the other arm member (left arm member 11 in the case of FIG. 1) and the two nuts 23 and 23 screwed into the thread of the bolt rod 22 It is comprised with the insertion groove | channel 24 by which the said bolt rod 22 was provided.
The bolt rod 22 can be raised and lowered along the outer peripheral surface of the arm member 10 around the shaft portion 22a, and the insertion groove 24 extends along the circumferential direction on the outer peripheral surface side of the arm member 11. It has been extended to. Then, the front end sides 10b and 11b of the pair of arm members 10 and 11 are closed and brought close to each other in the directions of arrows C and D in FIG. 1, the bolt rod 22 is tilted and inserted into the insertion groove 24, and the above By tightening the nuts 23 and 23 and bringing them into pressure contact with the end surfaces on one end side of the pair of groove walls that form the insertion groove 24, the distal end sides 10b and 11b of both the arm members 10 and 11 are joined and separated from each other. It can be prevented. On the other hand, by loosening the nuts 23 and 23 and raising the bolt rod 22 and pulling it out from the insertion groove 24, the restraints of the distal end sides 10b and 11b of both arm members 10 and 11 can be released. Can be opened and separated in the directions of arrows E and F.

  The key groove 15 is provided on the base end sides 10a and 11a of the pair of arm members 10 and 11, and is provided on the base end sides 10a and 11a of the pair of arm members 10 and 11, respectively. It is formed by a pair of notches 26 and 27, and the groove width on the opening side, that is, the inner peripheral surface side of the arm members 10 and 11, is expanded and contracted by the contact and separation of the distal end sides 10b and 11b of the arm members 10 and 11. It has become.

As described above, the key groove 15 can be reduced in width in the case of a key groove with a fixed groove width as described above. This is because it is necessary to pull out the key groove, so that the direction in which the thrust clamp is pulled out from the annular groove of the roll shaft is limited, and the work becomes very troublesome.
For example, in the case shown in FIG. 6, the roll shaft must be stopped with the key positioned at the top of the roll shaft, and the thrust clamp must be pulled upward along the key. Adjustment was difficult, and skilled work was required at work in high places, which took time.
Therefore, in the present invention, as shown in FIG. 5, when the thrust clamp 1 is detached from the roll shaft 3, the distal end sides 10b, 11b of the pair of arm members 10, 11 are separated from each other on the inner peripheral surface side. At the same time that the key groove 15 is widened, the key groove 15 and the key 9 are disengaged, so that the thrust of the key 9 no matter which direction the roll shaft 3 is located. The clamp 1 can be easily pulled out from the roll shaft 3.

In this embodiment, as described above, the connecting projections 18 and 19 provided on the end surfaces of the base end sides 10a and 11a of the pair of arm members 10 and 11, respectively, , 11 projecting from the end surfaces of the base end sides 10a, 11a that are biased toward the outer peripheral surface, the remaining portions of the base end sides 10a, 11a, ie, the pair of arm members 10 11 have substantially L-shaped notches 26 and 27 formed on the inner peripheral surface side of the arm members 10a and 11a on the end surfaces of the base end sides 10a and 11a, respectively.
And by these pair of substantially L-shaped notches 26, 27, the end surfaces on the inner peripheral surface side of the base end sides 10a, 11a of the arm members 10, 11 and the connecting projections 18, 19 The space surrounded by the inner peripheral surface of each arm member 10, 11 is configured to form a single keyway 15.
Therefore, as shown in FIGS. 4 and 5, when the pair of arm members 10 and 11 are rotated about the connecting portion 12, the distal end sides 10b and 11b are opened and separated from each other. When the inner peripheral surface side, that is, the inner peripheral surface side of the thrust clamp 1 is opened, the groove width of the key groove as a whole including the opening side of the key groove 15 is increased, and the engagement with the key 9 is substantially achieved. It will be in a released state.
On the contrary, as shown in FIG. 1, when the distal end sides 10b and 11b of the pair of arm members 10 and 11 are closed and brought close to each other and the inner peripheral surface side of the thrust clamp 1 is closed, the key groove Reference numeral 15 denotes a substantially U-shape, which is a normal groove width that is appropriately engaged with the key 9, and the key 9 is fitted in the key groove 15.

Further, the engagement grooves 13 and 14 are engaged with the locking plate 28 attached to the roll axial direction positioning device 2, thereby fixing the position of the thrust clamp 1 with respect to the roll axial direction positioning device 2 and the roll shaft 3. In particular, the function of preventing rotation is further strengthened and the tip side 10b, 11b of the pair of arm members 10, 11 is prevented from opening and falling off the roll shaft 3 when attached to the roll shaft 3. It is.
Here, the prevention of dropout will be described. Since the entire roll including the roll shaft 3 vibrates when the rolling mill is operating, the nut attached to the bolt rod 22 of the thrust clamp 1 by the vibration or the like. 23 and 23 may be loosened and the bolt rod 22 may come out of the insertion groove 24. Then, if no countermeasures are taken, the distal ends 10b and 11b of the pair of arm members 10 and 11 are uncoupled and opened apart from each other, and further, the distal ends 10a of the arm members 10 and 11 are separated. , 11a is greatly opened and there is a risk of dropping off from the roll shaft 3.
Therefore, in the present invention, the engagement grooves 13 and 14 are provided in the pair of arm members 10 and 11, respectively, and attached to the roll chock (in this embodiment, strictly speaking, the roll chock roll axial positioning device 2). Each of the arm members 10 and 11 is prevented from moving by engaging the locking plate 28 to be engaged, and even if the connection between the distal end sides 10b and 11b of the pair of arm members 10 and 11 is released, these arm members 10 and 11 are released. 11 can be prevented from opening each other.

  In the case of this embodiment, the engagement grooves 13, 14 are positioned so as to face each other with the roll shaft 3 sandwiched between the thrust clamp 1 and the roll shaft 3. Respectively. Actually, as shown in FIG. 1, the arm members 10 and 11 are provided at substantially intermediate positions on the outer peripheral surface side. The engaging grooves are all the same size and shape, and can be engaged with each other using a locking plate having the same shape and size.

Further, the locking plate 28 that engages with the engagement grooves 13 and 14 includes the base plate portion 28a attached to the roll axial direction positioning device 2 and the engaging portion provided integrally with the longitudinal portion of the base plate portion 28a. And an engaging projection 28b engaged with the mating grooves 13 and 14. The board portion 28a is curved so as to follow the arc of the periphery of the lock nut 8 of the roll axis direction positioning device 2, and the bolt 29 of the bolt 29 used for attachment to the roll axis direction positioning device 2 is provided on the plate surface. A plurality of through holes 28c into which the flanges 29a are inserted are provided. Further, the engaging convex portion 28b has a width and a protruding length substantially equal to the groove width and depth of the engaging grooves 13 and 14, and fits in the engaging grooves 13 and 14 without rattling. Can be accommodated.
The locking plate 28 is attached to the roll axis direction positioning device 2 by the two bolts 29, and each bolt 29, 29 is attached to the roll axis direction positioning device 2 as shown in FIGS. The lock nut 8 is attached by being screwed into the screw hole 7a of the cylinder cap 7 through the through hole 8a formed in the lock nut 8. Further, as shown in FIG. 3, the bolt 29 used for attaching the locking plate 28 is provided with a through hole 29c penetrating in a direction perpendicular to the axis of the bolt 29 in the bolt head 29b. As shown in FIG. 3, the adjacent bolts 29, 29 are connected to each other by a wire 30 or the like using the respective through holes 29c, 29c, so that loosening due to vibration or the like can be prevented.

  When the thrust clamp 1 having the above-described configuration is removed from the annular groove 3a of the roll shaft 3, the locking plate 28 is removed, and then the coupling means 21 on the distal end sides 10b and 11b of the pair of arm members 10 and 11 is used. The joints are released so that the distal end sides 10b and 11b are opened and separated from each other, and as shown in FIGS. 4 and 5, the space between the distal end sides 10b and 11b of the arm members 10 and 11 is set. The arm members 10 and 11 are opened wide to open the inner peripheral surface side. Then, the thrust clamp 1 is pulled out from the roll shaft 3 using a hoist through the portions where the arm members 10 and 11 are opened from each other.

At this time, since the key groove 15 of the thrust clamp 1 is fitted to the key 9 on the outer peripheral surface of the roll shaft 3, it is necessary to pull out the key groove 15 from the key 9 when the thrust clamp 1 is removed. There is. However, the key groove 15 is formed by a pair of notches 26 and 27 provided on the proximal end sides 10a and 11a of the pair of arm members 10 and 11, respectively, and the distal ends 10b and 11b of the arms 10 and 11 are formed. Since the groove width on the opening side contracts and expands due to the contact / separation, when the distal end sides 10b and 11b of the pair of arm members 10 and 11 are separated from each other, the groove width of the key groove 15 increases and the key 9 is substantially released.
Accordingly, the key groove 15 can be easily pulled out regardless of where the key 9 of the roll shaft 3 is stopped. Therefore, the thrust clamp 1 can be easily detached from the roll shaft 3 in a short time. Can do.

  On the other hand, when the thrust clamp 1 is attached to the annular groove 3a of the roll shaft 3, the tip sides 10b, 11b of the pair of arm members 10, 11 are separated from each other, and the space between these tip sides 10b, 11b is separated. Is opened, and the thrust clamp is moved above the roll shaft 3 by a hoist. Furthermore, after fitting these arm members 10 and 11 so as to be wound around the annular groove 3a through the open space between the tip sides 10b and 11b, the tip sides 10b and 10b of the arm members 10 and 11, respectively. 11b are brought into contact with each other, and the leading end sides 10b and 11b are coupled to each other by the coupling means 21. Then, in a state where the engaging protrusions 28b of the corresponding locking plate 28 are engaged with the engaging grooves 13 and 14 provided on the outer peripheral surface side of the arm members 10 and 11, the respective locking plates 28 are moved. The two bolts 29 and 29 are fixed to the roll axis direction positioning device 2 with two bolts 29 and 29, respectively, and the two bolts 29 and 29 are used to prevent loosening by using the through holes 29c of the bolt head 29b. Connect with each other.

At this time, when the thrust clamp 1 is fitted into the annular groove 3a, it is necessary to fit the key groove 15 into the key 9, but the distal end sides 10b, 11b of the pair of arm members 10, 11 are mutually connected. In the state of being separated from each other, the groove width of the key groove 15 is increased, so that the key 9 can be easily inserted into the key groove 15. On the other hand, as shown in FIG. 1, the front end sides 10b and 11b of the arm members 10 and 11 are brought into contact with each other so that the groove width of the key groove 15 returns to the normal width and is firmly fitted to the key 9. Since it will be in a state, attachment can be performed easily and reliably.
Further, the locking plates 28 are engaged with the engaging grooves 13 and 14 on the outer peripheral surface side of the pair of arm members 10 and 11, respectively, thereby preventing the movement of the pair of arm members 10 and 11 and the distal end side 10b. 11b can be prevented, so that even if the coupling means 21 uncouples the distal ends 10b, 11b of the pair of arm members 10, 11, the inner circumference of the pair of arm members 10, 11 The face side is not greatly opened. Thereby, since the thrust clamp 1 can maintain stably the state attached to the roll axis | shaft 3, it can prevent falling off from the roll axis | shaft 3 reliably.

In the above embodiment, the key groove 15 is formed by a pair of substantially L-shaped notches 26 and 27 formed on the base end sides 10a and 11a of the pair of arm members 10 and 11, respectively. However, the shape of these notches can be any shape as long as a key groove that fits the key can be formed.
Moreover, in the said embodiment, the protrusions 18 and 19 for connection provided in the end surface of the base end side 10a of the said pair of arm members 10 and 11 and 11a are made into the outer peripheral surface side of the arm members 10 and 11 in this end surface. The notches 26 and 27 are formed by providing them at a position deviated from each other. However, if the groove width of the key groove can be expanded and contracted by contact and separation on the tip side of each arm member, Arbitrary structures can be used for the structure concerning a notch.

  Furthermore, in the above-described embodiment, the engaging grooves 13 and 14 that engage with the locking plate 28 are provided in the intermediate portions of the arm members 10 and 11. The arm member may be provided at any position on the outer peripheral surface side of the arm member as long as the separation on the distal end side can be suppressed. The number of engaging grooves is not necessarily one for each arm member, and a plurality of engaging grooves may be provided.

DESCRIPTION OF SYMBOLS 1 Thrust clamp 2 Roll axial direction positioning device 3 Roll shaft 3a Annular groove 9 Key 10,11 Arm member 12 Connection part 13,14 Engagement groove 15 Key groove 18,19 Protrusion part 20 Axis member 26,27 Notch 28 Locking plate

Claims (2)

In the annular thrust clamp that functions as a retaining from the roll chock of the roll by fitting it into the annular groove provided around the axis on the roll shaft end side of the roll held rotatably in the roll chock of the rolling mill,
A pair of arm members that are formed in a semicircular arc shape and are fitted into the annular groove, and the pair of arm members such that the distal end sides of the arm members can contact and separate from each other. includes a connecting portion interconnecting the in one point of the base end side,
An engagement groove that can be engaged with a locking plate attached to the roll chock is provided on the outer peripheral surface side of the pair of arm members , respectively, in order to lock the pair of arm members to the roll chock ,
Further, the pair of arm members have a single key groove into which an anti-rotation key disposed between the inner peripheral surface side and the outer peripheral surface side of the roll shaft is fitted. The groove is formed by a pair of notches provided on the base end side of each of the pair of arm members, and the groove width on the opening side is expanded and contracted by contact and separation on the tip end side of each arm member. Machine thrust clamp. The connecting portion is formed on one shaft member extending in a direction along the axial direction of the roll shaft, and a portion biased toward the outer peripheral surface side of each arm member on the base end side end surfaces of the pair of arm members, respectively. Each of the connecting protrusions is connected to each other by a shaft member so as to be rotatable around the axis of the shaft member.
2. The key groove is formed by a notch formed on an inner peripheral surface side of each arm member at an end surface of each arm member at a base end side by each connecting projection. A thrust clamp for a rolling mill as described in 1.

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