JP6044514B2 - Thrust force measuring device and rolling mill - Google Patents

Description

  The present invention relates to a thrust force measuring device and a rolling mill, and more particularly to a thrust force measuring device that measures a thrust force generated in a work roll when a material to be rolled is rolled with the work roll, and a rolling mill equipped with the thrust force measuring device.

  In the rolling mill, a force in the rotation axis direction, that is, a thrust force is generated on the work roll due to the asymmetry of the material to be rolled, the inclination of the work roll with respect to the material to be rolled, and the shape of the work roll. Since this thrust force affects the service life of equipment such as a roll chock and a bearing interposed between the roll chock and the work roll, it is very important to measure and manage the thrust force generated in the work roll. Then, the technique regarding the measurement of the thrust force which generate | occur | produces in the work roll of a rolling mill is disclosed by the following patent document 1 and patent document 2. FIG.

Patent Document 1 discloses that a thrust force between a work roll and a backup roll is measured with a load cell installed inside a chock of the backup roll.
Patent Document 2 discloses a strain gauge type load measuring device in which a strain gauge is attached to the inner and outer surfaces of a post of a mill housing, and a rolling load is obtained in a form that cancels out a thrust force generated during rolling by upper and lower rolls. ing.

JP 2004-243398 A JP 61-226106 A

  By the way, since the thrust force generated in the work roll of the rolling mill is transmitted to the roll chock that supports the work roll and the housing that supports the roll chock, as in Patent Document 1, a load cell is installed inside the chock of the backup roll. Even when the strain gauge is attached to the inner and outer surfaces of the post of the mill housing as in Patent Document 2, the thrust force generated in the work roll can be measured.

However, when measuring the thrust force generated on the work roll with a load cell installed inside the chock or a strain gauge attached to the inner and outer surfaces of the mill housing post, the work roll is affected by the friction between the roll chock and the housing. Since the measured value is smaller than the true thrust force generated, the measurement accuracy of the thrust force generated in the work roll is low.
Therefore, the present inventor made the present invention by paying attention to the end face in the axial direction of the work roll.
An object of the present invention is to provide a thrust force measuring device capable of measuring a thrust force generated in a work roll with high accuracy and a rolling mill equipped with the thrust force measuring device.

In order to solve the above problems, a thrust force measuring device according to an aspect of the present invention is generated in the work roll when a roll chock is supported by a housing and the material to be rolled is rolled by the work roll supported by the roll chock. A thrust force measuring device for measuring a thrust force to be generated, wherein the thrust member generated in the axial direction of the work roll and an intermediate member fixed to the end face in the axial direction of the work roll is converted into an electric signal . And a load cell pressing mechanism that presses the load cell against the intermediate member toward the axial end surface of the work roll.

Further, in the thrust force measuring apparatus according to one aspect of the present invention, the intermediate member transmits the rotational force of the work roll to the load cell so that the axial rotational force of the work roll is not transmitted to the load cell. A thrust bearing that shuts off is preferred.
Further, in the thrust force measuring device according to one aspect of the present invention, the load cell pressing mechanism includes a plurality of bolts in which a head portion, a male screw portion, and an insertion portion are arranged in this order, and an axial direction of the work roll. The load cell is fixed to the surface on the work roll side among the two surfaces located on the opposite side, and a fixed plate provided with a plurality of through holes penetrating the two surfaces, and one end of the work roll is screwed to the front kilometers Ruchokku to cover the end faces fixed on the side, a cover having a plurality of through-female screw section which penetrates over the inside and outside of the part to the end surface and opposite portions of the axial direction of the work rolls are disposed A plurality of bolts, wherein the male threaded portions of the plurality of bolts are the plurality of the plurality of bolts so that the insertion portions of the plurality of bolts protrude inside the cover member. Fitted individually Tsumesu threaded portion, become inserted individually configured at each rotatable state of the insertion hole of the plurality of through the female screw portion of the fixing plate of each of the plurality of bolts Preferably it is.
Moreover, the rolling mill which concerns on 1 aspect of this invention is equipped with the said thrust force measuring device.

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.
ADVANTAGE OF THE INVENTION According to this invention, the thrust force measuring apparatus which can measure the thrust force which generate | occur | produces in a work roll with high precision, and a rolling mill provided with the same can be provided.

It is a front view showing a schematic structure of a rolling mill provided with a thrust force measuring device concerning an embodiment of the present invention. It is sectional drawing along the AA line of FIG. It is sectional drawing along the BB line of FIG. It is sectional drawing to which a part of FIG. 3 was expanded.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments of the invention, and the repetitive description thereof is omitted.
In the present embodiment, a thrust force measuring device according to the present invention and a two-stage rolling mill equipped with the same will be described with reference to FIGS. 1 to 4.

In the present embodiment, a direction along the traveling direction of the material to be rolled, which will be described later, is referred to as an X direction, a direction orthogonal to the X direction in the same plane is referred to as a Y direction, and is orthogonal to the X direction and the Y direction. The direction is sometimes called the Z direction.
In addition, in order to make the drawings easy to see, some of the hatching representing the cross section is omitted in FIGS. 3 and 4.

  1 and 2, a two-stage rolling mill 1 according to an embodiment of the present invention includes a housing 9, and an upper work roll 2 and a lower work disposed in the housing 9 in the vertical direction (Z direction). A pair of upper work roll chock 4a, 4b as a bearing part for individually supporting both ends of the roll 3 and the upper work roll 2, and a pair of lower parts as bearing parts for individually supporting both ends of the lower work roll 3 Side work roll chock 5a, 5b is provided. The two-stage rolling mill 1 is a temper rolling mill provided in a rolling facility for a material to be rolled.

Further, the two-stage rolling mill 1 is individually disposed between the bottom plate portion 9a of the housing 9 and the pair of lower work roll chock 5a, 5b corresponding to each of the pair of lower work roll chock 5a, 5b. A pair of reduction cylinders 6 is provided.
The two-stage rolling mill 1 is individually disposed between the top plate portion 9b of the housing 9 and the pair of upper work roll chock 4a, 4b corresponding to each of the pair of upper work roll chock 4a, 4b. A pair of pressure blocks 7 are provided.

In addition, the two-stage rolling mill 1 includes four work roll balances 8 that are disposed two each between a pair of upper work roll chock 4a, 4b and a pair of lower work roll chock 5a, 5b. Yes. Each of the four work roll balances 8 is constituted by, for example, a cylinder mechanism.
Further, the two-stage rolling mill 1 includes two keeper plates 11a and 11b for one lower work roll chock 5a (see FIG. 3), and the other lower work roll chock 5b and a pair of upper work roll chock. Two key puff rates 11a and 11b are also provided for each of 4a and 4b (not shown).

  In the pair of reduction cylinders 6, one reduction cylinder 6 has a cylinder tube 6b attached to the bottom plate portion 9a of the housing 9, and an upper end portion of the cylinder rod 6a on a surface of the lower work roll chock 5a on the reduction cylinder 6 side. The pressing load is supplied to one lower work roll chock 5a in contact. In the other reduction cylinder 6, the cylinder tube 6b is attached to the bottom plate portion 9a of the housing 9, and the tip of the cylinder rod 6a abuts against the surface of the other lower work roll chock 5b on the reduction cylinder 6 side. A rolling load is supplied to the lower work roll chock 5b.

  In the pair of pressure blocks 7, one pressure block 7 is attached to the top plate portion 9b of the housing 9 via a reduction screw (not shown) connected to the upper surface, and the lower surface is the pressure of the upper work roll chock 4a. The reaction force of the rolling load is applied to the upper work roll chock 4a in contact with the surface on the block 7 side. The other pressure block 7 is attached to the top plate portion 9b of the housing 9 via a reduction screw (not shown) connected to the upper surface, and the lower surface is the surface on the pressure block 7 side of the other upper work roll chock 4b. Is applied to the other upper work roll chock 4a.

  In the two work roll balances 8 disposed between one upper work roll chock 4a and one lower work roll chock 5a, one work roll balance 8 is disposed on the front pillar 9c side of the housing 9, The other work roll balance 8 is disposed on the rear column portion 9 d side of the housing 9. In each of the two work roll balances 8, each cylinder tube 8b is fixed to the front column portion 9c and the rear column portion 9d of the housing 9, and the tip of each cylinder rod 8a is the workpiece of one upper work roll chock 4a. It is in contact with the surface on the roll balance 8 side.

  In the two work roll balances 8 arranged between the other upper work roll chock 4b and the other lower work roll chock 5b, one work roll balance 8 is arranged on the front pillar 9c side of the housing 9, The other work roll balance 8 is disposed on the rear column portion 9 d side of the housing 9. In each of the two work roll balances 8, each cylinder tube 8b is fixed to the front column portion 9c and the rear column portion 9d of the housing 9, and the tip of each cylinder rod 8a is the workpiece of the other upper work roll chock 4b. It is in contact with the surface on the roll balance 8 side.

  The pair of upper work roll chock 4a, 4b and the pair of lower work roll chock 5a, 5b are disposed between the front column portion 9c and the rear column portion 9d of the housing 9, and are on the rear column portion 9d side of the front column portion 9c. This surface and the surface of the rear column portion 9d on the front column portion 9c side can be moved in the vertical direction (Z direction) as a guide surface. The pair of upper work roll chocks 4a and 4b and the pair of lower work roll chocks 5a and 5b are moved by a reduction cylinder 6 and a work roll balance 8.

  As shown in FIG. 3, the lower work roll chock 5a is provided with recesses 12a and 12b on each of two outer wall surfaces located on opposite sides in the X direction. Of these two recesses 12a and 12b, one recess 12a is fitted with a keeper plate 11a supported on the outer wall surface of the front column portion 9c of the housing 9, and the other recess 12b is fitted with a rear column portion of the housing 9. A keeper plate 11b supported on the outer wall surface of 9d is fitted. Although not shown, the two recesses 12a and 12b are also provided in each of the other lower work roll chock 5b and the pair of upper work roll chock 4a and 4b. Further, also in the recesses 12a and 12b of the work roll chock (5b, 4a and 4b), keeper plates 11a and 11b supported on the side surfaces of the front pillar portion 9c and the rear pillar portion 9d of the housing 9 are fitted. .

  As shown in FIGS. 3 and 4, one end of the lower work roll 3 is rotatably supported by one lower work roll chock 5a via a roller bearing 13 and a ball bearing 14 as bearings. The roller bearing 13 and the ball bearing 14 are covered with a lower work roll 3 by a positioning member 15 fixed to the end face 3a by a screw so as to cover the peripheral edge of one end face 3a in the rotation axis direction of the lower work roll 3. Positioning in the direction along the axial direction is performed.

  Although not shown in the drawing, the other end side of the lower work roll 3 and the both end sides of the upper work roll 2 are also provided with roller bearings and ball bearings as bearings in the same manner as one end side of the lower work roll 3. Are supported by each work roll chock (5b, 4a, 4b) in a freely rotatable manner, and in these bearings, a positioning member fixed to the end face of the work roll with a screw so as to cover the peripheral edge of the end face of each work roll. Positioning in the direction along the axial direction of the work roll is performed.

  In the two-stage rolling mill 1 configured in this way, a pair of work roll chocks 4 a and 4 b that support both ends of the upper work roll 2 are supported by the housing 9, and a pair of works that support both ends of the lower work roll 3. Roll chock 5 a and 5 b are supported by the housing 9. In addition, the two-stage rolling mill 1 configured in this way rolls the material to be rolled by the pair of work rolls 2 and 3 supported by the work roll chock 4a, 4b, 5a and 5b. The material to be rolled proceeds in the direction indicated by the arrow L in FIG. 2 between the pair of work rolls 2 and 3, and is rolled while the pair of work rolls 2 and 3 are in progress.

As shown in FIGS. 3 and 4, the two-stage rolling mill 1 includes a thrust force measuring device 20. In the present embodiment, the thrust force measuring device 20 is not limited to this, but is disposed on one end side of the lower work roll 3.
The thrust force measuring device 20 is generated in the direction of the rotation axis of the lower work roll 3 and the thrust bearing 21 as an intermediate member rotatably supported on one end surface 3 a of the lower work roll 3 in the rotation axis direction. A load cell 22 that converts the thrust force SP into an electric signal and a load cell pressing mechanism 23 that presses the load cell 22 against the thrust bearing 21 are provided.

  The thrust bearing 21 has a structure in which a cage 21b in which a plurality of balls or rollers are annularly arranged is sandwiched between two washer plates 21a and 21c. Each of the two washer plates 21a and 21c has an annular groove in which a ball or a roller of the cage 21b rotates on the surface side sandwiching the cage 21b. That is, the thrust bearing 21 is configured such that the two washer plates 21a and 21c can rotate in opposite directions.

  In the two washer plates 21a and 21c, one washer plate 21a is formed on the end surface 3a of the lower work roll 3 so that the rotation shaft of the thrust bearing 21 and the rotation shaft of the lower work roll 3 are located on the same straight line. For example, it is fixed via an adhesive. The other washer 21c is rotatably supported by one washer 21a via the retainer 21b by the pressing force with which the load cell 22 is pressed against the washer 21c. That is, the thrust bearing 21 can block the transmission of the rotational force of the lower work roll 3 to the load cell 22 so that the rotational force of the lower work roll 3 is not transmitted to the load cell 22.

  Although it is not limited to this as the load cell 22, For example, the tension | pulling compression type load cell is used. This tension / compression load cell mainly has a configuration in which a strain-generating body that deforms in proportion to a force and a strain gauge that measures a deformation amount (strain) of the strain-generating body are housed in a housing. . The strain gauge is affixed to the strain body. A load button connected to the strain body is disposed outside the housing, and the strain body is deformed by applying a force to the load button. The tension-compression load cell outputs an electrical signal proportional to the deformation amount of the strain body by changing the electrical resistance of the strain gauge in proportion to the deformation amount of the strain body. Therefore, the load cell 22 outputs an electrical signal proportional to the thrust force SP when the axial thrust force SP of the lower work roll 3 is transmitted to the load button.

The load cell pressing mechanism 23 includes a plurality of bolts 24, a fixing plate 25 to which the load cell 22 is fixed, and one lower work roll chock 5a so as to cover the end face 3a on one end side in the rotation axis direction of the lower work roll 3. And a cover member 26 fixed with screws 16 for example.
Each of the plurality of bolts 24 has a configuration in which a head portion 24a, a male screw portion 24b, and an insertion portion 24c are arranged in this order. The head portion 24a has a different shape depending on a tool for rotating the male screw portion 24b. For example, the head portion 24a has a hexagonal shape or a shape in which a hexagonal hole is provided at the center of a cylinder. The insertion portion 24c has a smaller outer size than the male screw portion 24b, and a step portion is formed between the insertion portion 24c and the male screw portion 24b. The insertion portion 24c is formed of, for example, a circular column or cylinder having a circular outer shape.

In the fixed plate 25, the load cell 22 is fixed to the surface on the lower work roll 3 side of the two surfaces positioned on the opposite sides in the rotation axis direction of the lower work roll 3. The load cell 22 is fixed to the fixed plate 25 so that the center axis of the load button and the rotation axis of the lower work roll 3 are located on the same straight line.
In addition, the fixed plate 25 has a plurality of through holes 25 a that penetrate through two surfaces located on opposite sides in the rotation axis direction of the lower work roll 3. The plurality of through-holes 25a are disposed around a fixed position of the load cell 22 of the fixed plate 25 so as to surround the load cell 22 fixed to the fixed plate 25. The inner size of each of the plurality of through holes 25 a is larger than the outer size of the insertion portion 24 c of the bolt 24 and smaller than the outer diameter size of the male screw portion 24 b of the bolt 24. Since the insertion portion 24c of the bolt 24 is rotatably inserted into the plurality of through holes 25a, the same shape as the insertion portion 24c of the bolt 24, for example, a circular shape is preferable.

  The cover member 26 has two portions 26a that are located opposite to each other in the direction of the rotation axis of the lower work roll 3 on a portion 26a that faces the end surface 3a on one end side of the lower work roll 3 and inside and outside the portion 26a. A plurality of penetrating female screw portions 26b penetrating over the surface are provided. When the cover member 26 and the fixing plate 25 are overlapped with each other in plan view, the plurality of through female thread portions 26b are disposed at positions where they individually overlap with the plurality of through holes 25a of the fixing plate 25, respectively.

The number of the through holes 25a of the fixing plate 25 and the through female thread portions 26b of the cover member 26 correspond to the number of bolts.
Each of the plurality of bolts 24 has a male screw portion 24b of the cover member 26 such that each head portion 24a is located outside the cover member 26 and each insertion portion 24c protrudes from the cover member 26 to the inside thereof. The plurality of penetrating female screw portions 26b are individually fitted. The plurality of bolts 24 are individually inserted in a state in which each insertion portion 24 c is rotatable in each of the plurality of through holes 25 a of the fixing plate 25. The fixing plate 25 is supported by the cover member 26 via the plurality of bolts 24 by inserting the insertion portions 24c of the plurality of bolts 24 into the plurality of through holes 25a. At this time, the fixing plate 25 has an inner shape size of the through hole 25a of the fixing plate 25 larger than an outer diameter size of the insertion portion 24c of the bolt 24 and smaller than an outer diameter size of the male screw portion 24b of the bolt 24. Therefore, it is held at the step portion between the male screw portion 24b and the insertion portion 24c of the bolt 24.

  The load cell pressing mechanism 23 configured as described above rotates the plurality of bolts 24 to adjust the amount of protrusion of the plurality of bolts 24 to the inside of the cover member 26, thereby fixing the fixing plate 25 to the lower work roll 3. Since it can be moved in the direction of the rotation axis, the load cell 22 fixed to the fixed plate 25 can be pressed against the thrust bearing 21 and the pressing force to the thrust bearing 21 can be adjusted.

The number of bolts 24 may be two, but it is preferable to use three or more bolts 24 in order to hold the fixing plate 25 stably.
Next, the effect of the thrust force measuring apparatus 20 of this embodiment is demonstrated.
In the two-stage rolling mill 1, a material to be rolled is composed of an upper work roll 2 supported at both ends by a pair of work roll chock 4a, 4b and a lower work roll 3 supported at both ends by a pair of work roll chock 5a, 5b. For example, due to the asymmetry of the material to be rolled, the inclination of the work roll with respect to the material to be rolled, and the shape of the work roll itself, a thrust force SP in the direction shown in FIGS. Occur.

  Since this thrust force SP is transmitted to the lower work roll chock 5a that supports the lower work roll 3 and the housing 9 that supports the lower work roll chock 5a, the load cell is placed inside the work roll chock as in the prior art. The thrust force SP generated in the lower work roll 3 can be measured even when installed or when a strain meter or load cell is installed in the housing.

  However, when the thrust force generated in the lower work roll 3 is measured by a load cell installed in the work roll chock, a strain gauge or load cell installed in the housing, the lower work piece is affected by the friction between the work roll chock and the housing. Since the measured value is smaller than the true thrust force SP generated in the roll 3, the measurement accuracy of the thrust force SP generated in the lower work roll 3 is low.

  On the other hand, the thrust force measuring device 20 of this embodiment is disposed on one end side of the lower work roll 3. As described above, the thrust force measuring device 20 includes a thrust bearing 21 that is rotatably fixed to the end surface 3a on one end side of the lower work roll 3, and a thrust generated in the direction of the rotation axis of the lower work roll 3. A load cell 22 that electrically converts the force SP and a load cell pressing mechanism 23 that presses the load cell 22 against the thrust bearing 21 toward the end surface 3a on one end side of the lower work roll 3 are provided.

  Therefore, according to the thrust force measuring apparatus 20 of the present embodiment, the thrust force SP generated in the lower work roll 3 when rolling the material to be rolled by the upper work roll 2 and the lower work roll 3 is Since it is transmitted linearly from one end surface 3a of the work roll 3 to the load cell 22 via the thrust bearing 21, the lower work roll 3 is not affected by the friction between the lower work roll chock 5a and the housing 9. The generated thrust force SP can be measured. As a result, the thrust force SP generated in the lower work roll 3 can be measured with high accuracy as compared with the conventional case where a load cell is installed inside the work roll chock or a strain gauge is installed in the housing. Can do.

Further, according to the thrust force measuring device 20 of the present embodiment, the thrust force SP generated in the lower work roll 3 can be measured with high accuracy, and therefore, one end side of the lower work roll 3 and the lower work roll chock. The equipment life of the bearings (13, 14) interposed between them and 5a can be predicted with high accuracy.
Here, as a result of measuring the thrust force SP generated in the lower work roll 3 when the material to be rolled is rolled by the upper work roll 2 and the lower work roll 3, with the thrust force measuring device 20 of the present embodiment, The thrust force SP was 376 kgf. On the other hand, as a result of measurement with a load cell installed in the vicinity of the keeper plate 11a under the same conditions, the thrust force SP was 61 kgf. The difference 315 Kgf in the actual measurement value is estimated as the amount of frictional force absorbed between the lower work roll chock 5 a and the housing 9.

In the thrust force measuring device 20 of the present embodiment, a thrust bearing 21 is fixed to an end face 3 a on one end side of the lower work roll 3, and a load cell 22 is attached to the end face 3 a on one end side of the lower work roll 3. It is pressed toward.
Therefore, according to the thrust force measuring device 20 of the present embodiment, the transmission of the rotational force of the lower work roll 3 to the load cell 22 can be interrupted, so that the transmission is transmitted from the end face 3a on one end side of the lower work roll 3. The thrust force SP can be measured with the load cell 22.

In the thrust force measuring apparatus 20 of the present embodiment, the load cell 22 is supported by the cover member 26 via the fixing plate 25 and the bolt 24, and the cover member 26 is fixed to the lower work roll chock 5a with screws.
Therefore, according to the thrust force measuring apparatus 20 of the present embodiment, the load cell 22 can be installed and removed while the lower work roll 3 is incorporated by removing the cover member 26. When the load cell is disposed inside the work roll chock as in the prior art, it is difficult to install / remove the load cell with the work roll incorporated.

  In the thrust force measuring device 20 according to the present embodiment, the load cell pressing mechanism 23 includes the male screw portions 24b of the plurality of bolts 24 such that the insertion portions 24c of the plurality of bolts 24 protrude inside the cover member 26. The cover members 26 are individually fitted into the plurality of through female thread portions 26b, and the insertion portions 24c of the plurality of bolts 24 are individually inserted into the plurality of through holes 25a of the fixing plate 25 in a rotatable state. It has a configuration.

  Therefore, the fixing plate 25 can be moved in the direction of the rotation axis of the lower work roll 3 by adjusting the amount of protrusion by which the plurality of bolts 24 are turned to the inside of the cover member 26 by turning the plurality of bolts 24. The load cell 22 fixed to the fixed plate 25 can be pressed against the thrust bearing 21 and the pressing force to the thrust bearing 21 can be adjusted.

  In the above-described embodiment, the case where the thrust force measuring device is disposed on one end side of the lower work roll 3 has been described. However, the thrust force measuring device 20 may be disposed on the other end side of the lower work roll 3. That is, the thrust force measuring device 20 may be disposed on at least one of both ends of the lower work roll 3, but is preferably disposed on both ends of the lower work roll 3.

  In the above-described embodiment, the case where the thrust force measuring device 20 is disposed on the lower work roll 3 has been described. However, the thrust force measuring device 20 may be disposed on the upper work roll 2. That is, the thrust force measuring device 20 may be installed on at least one of the lower work roll 3 and the upper work roll 2, but is disposed on both the lower work roll 3 and the upper work roll 2. Also good.

However, the arrangement of the thrust force measuring device 20 needs to consider the work roll drive system.
Moreover, in the above-mentioned embodiment, the case where the thrust force measuring device 20 according to the present invention was incorporated in the two-stage rolling mill 1 was described. However, the present invention is not limited to this, and can be applied to a rolling mill having four or more stages. In this case, of course, the thrust force measuring device is arranged on the work roll, but the thrust force measuring device may be arranged on the backup roll. That is, the thrust force measuring device of the present invention is not limited to backup rolls and work rolls, and can be intended for rolls that contribute to rolling of the material to be rolled.

  As described above, the thrust force measuring device and the rolling mill according to the present invention have the effect of measuring the thrust force generated in the work roll with high accuracy, and are provided in the rolling equipment of the material to be rolled. It is useful for the machine and the thrust force measuring device mounted on it.

DESCRIPTION OF SYMBOLS 1 ... Two-stage rolling mill, 2 ... Upper work roll, 3 ... Lower work roll, 3a ... End face, 4a, 4b ... Upper work roll chock, 5a, 5b ... Lower work roll chock 6 ... Reduction cylinder, 6a ... Cylinder rod 6b ... Cylinder tube, 7 ... Pressure block 8 ... Work roll balance, 8a ... Cylinder rod, 8b ... Cylinder tube 9 ... Housing, 9a ... Bottom plate part, 9b ... Top plate part, 9c ... Front pillar part, 9d ... Rear pillar Part 11a, 11b: Keeper plate, 12a, 12b ... Recess 13: Roller bearing, 14 ... Ball bearing, 15 ... Positioning member, 16 ... Bolt 20 ... Thrust measuring device, 21 ... Thrust bearing, 22 ... Load cell, 23 ... Load cell pressing Mechanism 24 ... bolt, 24a ... head, 24b ... male screw part, 24c ... insertion part 5 ... fixing plate, 25a ... through holes, 26 ... cover member, 26a ... portion, 26b ... penetrating the female threaded portion, SP ... thrust force

Claims (4)

A roll chock is supported by the housing, and a thrust force measuring device that measures a thrust force generated in the work roll when rolling the material to be rolled by the work roll supported by the roll chock,
An intermediate member rotatably fixed to an end face in the axial direction of the work roll;
A load cell for converting a thrust force generated in the axial direction of the work roll into an electrical signal ;
A load cell pressing mechanism that presses the load cell against the intermediate member toward an axial end surface of the work roll;
A thrust force measuring device characterized by comprising:   2. The thrust bearing according to claim 1, wherein the intermediate member is a thrust bearing that blocks transmission of the rotational force of the work roll to the load cell so that the axial rotational force of the work roll is not transmitted to the load cell. The thrust force measuring device described. The load cell pressing mechanism is
A plurality of bolts in which the head, the male screw portion, and the insertion portion are arranged in this order;
Fixing in which the load cell is fixed to a surface on the work roll side among two surfaces positioned on opposite sides in the axial direction of the work roll, and a plurality of through holes penetrating the two surfaces are provided. The board,
Wherein the one end side of the end surface covering manner screwed prior km Ruchokku with the work roll, a plurality of through-female screw section which penetrates across and out of that portion in the axial direction end surface and facing portions of the work roll A cover member provided with:
Have
The male screw portions of each of the plurality of bolts are individually fitted into the plurality of through female screw portions of the cover member so that the insertion portion of each of the plurality of bolts protrudes to the inside of the cover member,
The thrust force according to claim 1 or 2, wherein the insertion portion of each of the plurality of bolts is individually inserted into the plurality of through holes of the fixing plate in a rotatable state. measuring device.   A rolling mill comprising the thrust force measuring device according to any one of claims 1 to 3.

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