JP7208089B2 - Tension measuring device and tension measuring method - Google Patents

Description

The present invention relates to a tension measuring device and a tension measuring method.

Conventionally, conveyor devices for conveying various objects are known. In such a conveyor device, if the tension applied to the conveyor belt that conveys the object is weaker than a desired tension, the conveyor belt may idle. On the other hand, if the tension applied to the conveyor belt that conveys the object is stronger than the desired tension, the conveyor belt may be damaged.

In relation to this, for example, Patent Literature 1 below discloses a belt conveyor device that adjusts the tension of the belt by pressing a roller so that it can move back and forth with a spring member. According to the belt conveyor device configured in this way, the tension of the belt can be adjusted to a desired value.

JP-A-7-237724

In general, if the spring member (biasing member) for generating tension is new, rely on the numerical value (spring constant) of the relationship between the compression length and force provided by the manufacturer to adjust the tension load. can manage. However, as the biasing member deteriorates over time, the free length of the biasing member changes, and the numerical values of the relationship between the compression length and the force provided by the manufacturer become unreliable, making it difficult to adjust and manage the tension load. . Therefore, there is a need to know the tension applied to the conveyor belt.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. It is an object of the present invention to provide a tension measurement method.

A tension measuring device according to the present invention for achieving the above object is a first plate member and a second plate member which are spaced apart from each other, and is arranged between the first plate member and the second plate member. a nut provided on the opposite side of the first plate member to the side on which the biasing member is provided and for generating a biasing force on the biasing member by rotating; and the nut is screwed. A bolt provided inside the biasing member and a repulsive force generated by the contraction of the biasing member in accordance with the tightening of the nut are applied to the axis of the conveyor belt via the bolt. and an imparting member that imparts tension to the conveyor belt, and an imparting member that is provided on the opposite side of the second plate member to the side where the biasing member is provided, and the repulsive force is provided on the second plate member. and a load cell applied through.

Further, a tension measuring method according to the present invention for achieving the above objects includes a first plate member and a second plate member which are provided apart from each other; a nut provided on the opposite side of the first plate member to the side on which the biasing member is provided and for generating a biasing force on the biasing member by rotating; and the nut are screwed together, and the bolt provided inside the biasing member and the repulsive force generated by the contraction of the biasing member in response to the tightening of the nut are applied to the conveyor belt via the bolt. an imparting member that imparts tension to the conveyor belt by imparting tension to the shaft of the second plate member; a load cell applied via a member, and a tension measuring method using a tension measuring device, wherein the load cell measures the repulsive force generated by tightening the nut to measure the tension. .

According to the tension measuring device and the tension measuring method described above, the tension applied to the conveyor belt can be actually measured by the load cell. It is possible to grasp the tension applied.

It is a side view which shows the transport-type freezing apparatus which concerns on this embodiment. It is a schematic diagram showing a tension measuring device concerning this embodiment.

An embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. In the description of the drawings, the same elements are denoted by the same reference numerals, and overlapping descriptions are omitted. The dimensional ratios in the drawings are exaggerated for convenience of explanation and may differ from the actual ratios.

FIG. 1 is a side view showing a transport-type freezing apparatus 1 according to this embodiment. FIG. 2 is a schematic diagram showing a tension measuring device 70 according to this embodiment.

As shown in FIG. 1, the transport-type freezing apparatus 1 includes a freezer 10 that cools an object E passing through, a belt conveyor device 20 that transports the object E, and a conveyor belt 21 that applies tension. It has a tension measuring device 70 that applies tension and measures the tension, a control section 80 that controls various operations, and a display section 90 that displays the numerical value of the tension obtained by the control section 80 .

As shown in FIG. 1, the freezer 10 has a substantially rectangular outer shape. The freezer 10 has an entrance opening 11 that serves as an entrance for the objects E to be transferred, and an exit opening 12 that serves as an exit for the objects E to be transferred. The freezer 10 is not particularly limited as long as it can cool the object E passing through it, and a known freezer can be used.

The belt conveyor device 20 conveys the object E to be conveyed from the entrance opening 11 of the freezer 10 to the exit opening 12 . The belt conveyor device 20 has a conveyor belt 21 which is a steel belt and a pulley 22 for rotating the conveyor belt 21, as shown in FIG. The object to be conveyed E is quickly frozen when placed on the conveyor belt 21 and passing through the freezer 10 .

The conveyer belt 21, on which the object to be conveyed E is arranged, conveys the object to be conveyed E in the conveying direction D1. The conveyor belt 21 is endless and consists of one belt.

Two pulleys 22 are provided upstream and downstream of the conveyor belt 21, as shown in FIG. By rotating the conveyor belt 21 wound around the pulley 22, the conveyor belt 21 is continuously turned.

The configuration of the tension measuring device 70 will be described below with reference to FIG. The tension measuring device 70 can apply tension to the conveyor belt 21 and measure the tension.

As shown in FIG. 2, the tension measuring device 70 includes a first plate member 71, a second plate member 72, and an urging member disposed between the first plate member 71 and the second plate member 72. 73, a nut 74 provided on the side of the first plate member 71 opposite to the side on which the biasing member 73 is provided, a bolt 75 screwed into the nut 74, and the repulsive force generated by the biasing member 73 is transferred to the conveyor. A repulsive force generated by an applying member 76 applied to the shaft of the belt 21 , a take-up frame 77 on which the applying member 76 is slidably arranged, and a biasing member 73 is applied via the second plate member 72 . and a fixing member 79 for fixing the load cell 78 and the second plate member 72 to the take-up frame 77 . For ease of understanding, FIG. 2 shows the second plate member 72 and the load cell 78 as cross-sectional views.

The first plate member 71 and the second plate member 72 are provided apart from each other as shown in FIG. The first plate member 71 is arranged to contact the biasing member 73 and the nut 74 .

The second plate member 72 is arranged to contact the load cell 78 and the biasing member 73, as shown in FIG.

The biasing member 73 is composed of a plurality of disc springs, as shown in FIG. The number of disc springs forming the biasing member 73 is not particularly limited, but is, for example, 50 pieces.

The nut 74 is arranged so as to abut on the first plate member 71 . By tightening the nut 74 so that the nut 74 moves to the left in FIG. 2, the operator can move the axis of the conveyor belt 21 to the right in FIG. can.

A nut 74 is screwed onto the bolt 75 as shown in FIG. The bolt 75 is configured to extend in the horizontal direction in FIG. The bolt 75 is arranged inside the biasing member 73 .

The imparting member 76 imparts the repulsive force generated by the contraction of the biasing member 73 in accordance with the tightening of the nut 74 to the shaft of the conveyor belt 21 via the bolt 75 . As shown in FIG. 2, the imparting member 76 imparts a repulsive force to the axis of the conveyor belt 21 when the head 75A of the bolt 75 is brought into contact with the axis of the conveyor belt 21 to move the axis of the conveyor belt 21 to the right side in FIG. The tension applied to the conveyor belt 21 is increased by sliding. The applying member 76 is provided with a groove (not shown) and is arranged so as to be slidable with respect to the convex portion 77A of the take-up frame 77 .

The take-up frame 77 has a rectangular shape, as shown in FIG. A convex portion 77A is formed on the lower portion of the take-up frame 77 so as to extend in the left-right direction.

A load cell 78 is arranged between the second plate member 72 and the fixed member 79 . The load cell 78 incorporates a strain gauge (not shown) that generates a signal corresponding to the amount of strain generated by receiving the repulsive force of the biasing member 73 . A signal from the strain gauge is transmitted to the control section 80 via the signal line L, as shown in FIG.

The fixing member 79 fixes the load cell 78 and the second plate member 72 to the left wall 77B of the take-up frame 77, as shown in FIG. A method of fixing the fixing member 79 to the take-up frame 77 is not particularly limited, but for example, it may be fixed by bolts.

The control unit 80 is, for example, a CPU. The control unit 80 has a function (logging function) of capturing and storing the signal of the load cell 78 at a predetermined timing and a function of calculating the force applied to the load cell 78 based on the signal of the load cell 78 .

By providing the logging function to the control unit 80 in this way, the state of deterioration over time (horizontal axis is years and vertical axis is tension) can be managed, so that it is possible to grasp the tension at which the wheel spins, The timing of replacement of the biasing member 73 can be grasped from the situation. As a result, it becomes possible to clarify the timing for preventing the conveyor belt 21 from slipping and for exchanging the biasing member 73, so that preventive maintenance and planned maintenance can be carried out in a suitable manner.

The calculation result of the tension obtained by the control unit 80 is transmitted to the display unit 90 . The display unit 90 is, for example, a display. Since the actual measured value of the tension applied to the conveyor belt 21 is displayed on the display unit 90 in this manner, the operator can rotate the nut 74 while viewing the numerical value displayed on the display unit 90 to By adjusting the position of the nut 74 in the left-right direction in FIG. 2, the tension applied to the conveyor belt 21 can be set to a desired value.

Next, a method of applying tension (adjustment method) to the conveyor belt 21 and a method of measuring the tension applied to the conveyor belt 21 will be described.

First, the worker tightens the nut 74 so that the nut 74 moves to the left side in FIG. As a result, the first plate member 71 in contact with the nut 74 moves leftward in FIG.

As the first plate member 71 moves to the left in FIG. 2, the biasing member 73 sandwiched between the first plate member 71 and the second plate member 72 is compressed. .

When the biasing member 73 is compressed, the repulsive force of the biasing member 73 acts on the nut 74 via the first plate member 71, and the bolt 75 with which the nut 74 is screwed is affected. A rightward force in FIG. 2 is applied.

The force applied to the bolt 75 to the right acts on the applying member 76 to move the applying member 76 to the right in FIG. 2, thereby moving the pulley 22 to the right in FIG. The tension acting on 21 increases.

On the other hand, the tension applied to the conveyor belt 21 is reduced by the operator rotating the nut 74 so that the nut 74 moves to the right side in FIG. With the above mechanism, the tension applied to the conveyor belt 21 can be adjusted.

Also, the repulsive force of the biasing member 73 acts on the load cell 78 via the second plate member 72 . The repulsive force acting on the load cell 78 is transmitted to the control unit 80 via the signal line L, the tension applied to the conveyor belt 21 is calculated by the control unit 80, and the calculation result is displayed on the display unit 90. The numerical value of the tension applied to 21 is displayed.

Here, when the biasing member 73 is new, the tension load can be adjusted and managed by relying on the numerical value of the relationship between the compression length and the force provided by the manufacturer. However, for example, in a tension measuring device in which the load cell 78 is not provided, the free length of the biasing member 73 changes as the biasing member 73 deteriorates over time. It becomes difficult to adjust and manage the tension load. In contrast, according to the tension measuring device 70 according to the present embodiment, since the tension can be actually measured by the load cell 78, even if the biasing member 73 deteriorates over time, the conveyor belt 21 is It is possible to grasp the tension applied by Therefore, it is possible to suitably perform weight adjustment and management of the tension.

For example, if the tension applied to conveyor belt 21 is less than desired, to prevent conveyor belt 21 from spinning, rotate nut 74 so that it moves to the left in FIG. , the tension can be increased to a desired value to allow the conveyor belt 21 to rotate in a favorable manner. Also, if the tension applied to the conveyor belt 21 is greater than the desired value, the tension is reduced to the desired value by rotating the nut 74 so that the nut 74 moves to the right in FIG. Damage to the conveyor belt 21 can be prevented.

Further, in the transport-type freezing apparatus 1, when the tension applied to the conveyor belt 21 is larger than a desired value due to the cooling and thermal contraction of the conveyor belt 21, the nut 74 moves to the right side in FIG. By rotating the nut 74 in such a manner, the tension can be reduced to a desired value to prevent breakage of the conveyor belt 21 .

Also, in the transport-type freezing apparatus 1, when a foreign object is caught in the conveyor belt 21, the tension measuring device 70 can detect that the tension applied to the conveyor belt 21 is extremely large. At this time, the operator can temporarily stop the conveying operation of the conveyor belt 21 and remove the foreign matter from the conveyor belt 21 .

As described above, the tension measuring device 70 according to the present embodiment includes the first plate member 71 and the second plate member 72 provided apart from each other, and the first plate member 71 and the second plate member A biasing member 73 arranged between 72 and a nut provided on the opposite side of the first plate member 71 to the side on which the biasing member 73 is provided, for generating a biasing force on the biasing member 73 by rotating. 74 and a nut 74 are screwed together, and a bolt 75 provided inside the biasing member 73 . is provided on the side opposite to the side on which the biasing member 73 of the second plate member 72 is provided, and the imparting member 76 that imparts tension to the conveyor belt 21 by imparting tension to the shaft of the conveyor belt 21 via the a load cell 78 to which force is applied through the second plate member 72 . According to the tension measuring device 70 configured in this manner, the tension applied to the conveyor belt 21 can be actually measured by the load cell 78. Therefore, even if the biasing member 73 deteriorates over time, the conveyor belt The tension applied to 21 can be grasped. Therefore, it is possible to suitably adjust and manage the tension applied to the conveyor belt 21 .

The tension measuring device 70 further has a take-up frame 77 on which the applying member 76 is slidably arranged, and the load cell 78 is detachably fixed to the take-up frame 77 . According to the tension measuring device 70 configured in this way, one tension measuring device 70 can be used for a plurality of transport-type freezing apparatuses 1, and the versatility of the tension measuring device 70 is improved.

In addition, the tension measuring device 70 further has a control section 80 having a function of capturing and storing the signal of the load cell 78 along with the time change. According to the tension measuring device 70 configured as described above, by managing the state of deterioration and tension, it becomes possible to prevent the conveyor belt 21 from slipping and to clarify the replacement timing of the urging member 73, thereby preventing preventive maintenance and planning. Maintenance can be implemented.

Further, as described above, the tension measuring method according to the present embodiment includes the first plate member 71 and the second plate member 72 provided apart from each other, the first plate member 71 and the second plate member A biasing member 73 arranged between the members 72 and a biasing member 73 provided on the opposite side of the first plate member 71 to the biasing member 73 is rotated to generate a biasing force. A nut 74 and a bolt 75 provided inside the urging member 73 together with the nut 74 are screwed together. An imparting member 76 that imparts tension to the conveyor belt 21 by imparting tension to the conveyor belt 21 via 75 and a biasing member 73 of the second plate member 72 are provided on the side opposite to the side on which the biasing member 73 is provided. a load cell 78 to which a force is applied through a second plate member 72; to measure the tension. According to this tension measuring method, the tension applied to the conveyor belt 21 can be actually measured by the load cell 78. Therefore, even if the biasing member 73 deteriorates over time, the tension applied to the conveyor belt 21 can be measured. It is possible to grasp the tension that is applied.

Also, in the tension measuring method, the tension is measured when the conveyor belt 21 is cooled in the transport-type freezing apparatus. According to this tension measurement method, if the tension applied to the conveyor belt 21 is greater than a desired value due to the conveyor belt 21 being cooled and thermally contracted in the transport-type freezing apparatus 1, the nut 74 is By rotating the nut 74 so that it moves to the right of 2, the tension can be reduced to the desired value to prevent breakage of the conveyor belt 21 .

The present invention is not limited to the above-described embodiments, and can be modified in various ways within the scope of the claims.

For example, in the embodiments described above, the conveyor belt 21 is applied to the transport-type freezing device 1 for performing the cooling process. However, the conveyor belt 21 may also be applied to installations that perform processes such as cooking, processing or washing.

Also, in the above-described embodiment, the biasing member 73 is composed of a plurality of disc springs, but the present invention is not limited to this, and a coil spring or the like can be used.

In the above-described embodiment, the tension measuring device 70 has the take-up frame 77 on which the applying member 76 is slidably arranged, and the load cell 78 is detachably fixed to the take-up frame 77 . However, as long as the repulsive force of the biasing member 73 can be measured, the load cell 78 can be provided anywhere.

1 transport-type freezing device,
70 tension measuring device,
71 first plate member,
72 second plate member,
73 biasing member;
74 nut,
75 volts,
76 application member,
77 take-up frame,
78 load cell.

Claims (5)

a first plate member and a second plate member spaced apart from each other;
a biasing member disposed between the first plate member and the second plate member;
a nut provided on the side of the first plate member opposite to the side on which the biasing member is provided, the nut rotating to generate a biasing force on the biasing member;
a bolt to which the nut is screwed and provided inside the biasing member;
an imparting member that imparts a repulsive force generated by contraction of the biasing member in response to the tightening of the nut to the axis of the conveyor belt via the bolt to impart tension to the conveyor belt;
a load cell provided on the side of the second plate member opposite to the side on which the biasing member is provided, and to which the repulsive force is applied via the second plate member. further comprising a take-up frame on which the applying member is slidably arranged;
2. The tension measuring device of claim 1, wherein said load cell is removably secured to said take-up frame. 3. The tension measuring device according to claim 1, further comprising a control unit having a logging function for capturing and storing the signal of the repulsive force obtained from the load cell with time. a first plate member and a second plate member spaced apart from each other;
a biasing member disposed between the first plate member and the second plate member;
a nut provided on the side of the first plate member opposite to the side on which the biasing member is provided, the nut rotating to generate a biasing force on the biasing member;
a bolt to which the nut is screwed and provided inside the biasing member;
an imparting member that imparts a repulsive force generated by contraction of the biasing member in response to the tightening of the nut to the axis of the conveyor belt via the bolt to impart tension to the conveyor belt;
and a load cell provided on the opposite side of the second plate member to the side on which the biasing member is provided and to which the repulsive force is applied via the second plate member. A tension measurement method comprising:
A tension measuring method, wherein the repulsive force generated by tightening the nut is measured by the load cell to measure the tension. 5. The tension measuring method according to claim 4, wherein the tension is measured as the conveyor belt is cooled in a transport freezer.

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