JP4763428B2 - Mesh belt elongation detection device and heat treatment device - Google Patents

Description

  The present invention relates to a mesh belt elongation detection device that detects that the elongation of a mesh belt that moves along a loop-shaped circulation path and conveys a workpiece exceeds a predetermined amount, and a heat treatment device including the mesh belt elongation detection device About.

  A heat treatment apparatus for heating a workpiece in a heat treatment furnace includes a mesh belt that moves in a loop-shaped circulation path. This circulation path includes a work transfer range from the supply position outside the heat treatment furnace to the delivery position outside the heat treatment furnace via the inside of the heat treatment furnace. The workpiece is placed on the mesh belt at the supply position, and the workpiece is collected from the mesh belt at the delivery position.

  As such a heat treatment apparatus, for example, there is one such as a continuous sintering furnace apparatus in which the workpiece conveyance range extends to a length of about 20 m to 30 m. The mesh belt continuously moves along a circulation path including a relatively long work conveyance range, and is heated together with the work in the heat treatment furnace. Further, the mesh belt is stretched between the driving roller and the driven roller, and is sandwiched between the driving roller and the pressure roller and moves under a predetermined tension.

  For this reason, the mesh belt tends to stretch in the moving direction. The elongation in the moving direction of the mesh belt causes damage such as disconnection. If the mesh belt is left damaged, the workpiece cannot be conveyed properly.

  For this reason, there is a conventional heat treatment apparatus that can accurately detect the occurrence of a break in the mesh belt and prevent the occurrence of a workpiece conveyance abnormality (see, for example, Patent Document 1).

Further, regarding the detection of the mesh belt elongation, a pit is formed below the drive roller side in the mesh belt circulation path so that the mesh belt having the elongation hangs down in the pit. The amount of sag of the mesh belt in the pit is appropriately checked, and when the amount of sag exceeds a predetermined amount, maintenance such as cutting the mesh belt or replacing it is performed.
JP 2000-229723 A

  However, at present, the mesh belt is detected by the operator visually checking the amount of the mesh belt hanging in the pit. For this reason, there may be cases where the operator neglects confirmation or mistakes, and the amount of sag of the mesh belt exceeds a predetermined amount to be cut down, which may cause damage to the mesh belt.

  An object of the present invention is to accurately detect that a mesh belt has dropped beyond a predetermined amount and perform maintenance of the mesh belt at an appropriate timing, and the mesh belt elongation detection device. It is providing the heat processing apparatus provided with.

The mesh belt stretch detection device of the present invention includes an arm, a biasing member, a detection unit, and a display unit. The arm is swingably supported with an intermediate portion between the first end and the second end as a fulcrum, and the first end side of the arm circulates in a loop-shaped conveyance path and moves. It faces the hanging part of the mesh belt from below. The biasing member is a weight that biases the second end of the arm downward. Detection unit outputs the detection signal by the contact between the second end when the second end of the arm is displaced upward. The display unit notifies that the maintenance of the mesh belt is necessary based on the detection signal output from the detection unit.

  In this configuration, the hanging portion of the mesh belt faces the first end of the arm whose second end is urged downward by the urging member from above. As the elongation of the mesh belt increases, the amount of sag increases, and the sag portion of the mesh belt presses the first end of the arm. As a result, when the first end of the arm is displaced downward, the second end is displaced upward. This displacement is detected by the detection unit, and when the detection signal is output from the detection unit, the display unit is meshed. Notify that belt maintenance is required.

Therefore, by setting the biasing force of the biasing member to apply a positive, indicating elongation of the mesh belt is required maintenance upon reaching a predetermined amount is notified, the timing of maintenance of the mesh belt is accurately and reliably Be recognized.

  In the above configuration, the arm is swingably supported at an axial fulcrum parallel to the moving direction of the mesh belt, and the first end of the arm extends in a direction parallel to the axial direction of the fulcrum. A portion may be provided, and the extending portion may be opposed to the hanging portion of the mesh belt from below.

(1) the sheet to the image recording unit in the conveying paper conveyance path provided in the image recording apparatus for image formation by an electrophotographic method, in a first unit for detachably to the front side from the inside of the image recording apparatus A first unit that mounts a first sheet conveyance path that passes through the image recording unit together with a fixing device disposed at a downstream end of the first sheet conveyance path ;
A second unit that is detachable from the first unit in a direction perpendicular to the insertion / removal direction in a state in which the first unit is pulled out in the insertion / removal direction from the inside of the image forming apparatus to the front side. A second unit equipped with a second conveyance path for continuously reversing and conveying the sheet from the downstream side of the first sheet conveyance path with respect to the position where the fixing device is disposed ;
A plurality of support members that removably support the first unit in the insertion / removal direction ;
Wherein the arrangement position definitive in the direction orthogonal to the insertion and removal direction, wherein the second unit has been inserted state where the first unit is drawn out in the insertion and removal direction from the main unit, and the second unit is the interpolation The position of the center of gravity of the first unit in each of the states pulled out from the first unit in a direction orthogonal to the disengagement direction is set in the first unit so as to be between the arrangement positions of the plurality of support members . It is characterized by that.

  The heat treatment apparatus of the present invention includes a heat treatment furnace, a mesh belt, and a mesh belt elongation detection device. The heat treatment furnace heats the workpiece. The mesh belt moves along a loop-shaped circulation path, and places and conveys the workpiece while passing from the supply position outside the heat treatment furnace to the delivery position outside the heat treatment furnace via the inside of the heat treatment furnace. In the mesh belt elongation detecting device, the first end side of the fulcrum in the arm faces the hanging portion of the mesh belt from below outside the heat treatment furnace.

  In this configuration, when the mesh belt moving along the circulation path including the interval from the supply position to the delivery position via the inside of the heat treatment furnace is elongated, the hanging portion of the mesh belt is the first end of the arm. Press the part. As a result, when the first end of the arm is displaced downward, the second end is displaced upward. This displacement is detected by the detection unit, and when the detection signal is output from the detection unit, the display unit is meshed. Notify that belt maintenance is required. Therefore, when the elongation of the mesh belt reaches a predetermined amount, it is notified that maintenance is necessary, and the timing of maintenance of the mesh belt is recognized accurately and reliably.

  According to the mesh belt elongation detecting device and the heat treatment device of the present invention, it is detected with a simple configuration that the amount of hanging of the mesh belt reaches a predetermined amount due to the elongation of the mesh belt, and the mesh belt is maintained based on the detection result. It can be notified that it should be performed, and the timing of maintenance of the mesh belt can be recognized accurately and reliably.

  In addition, the degree of freedom of the arrangement position of the device can be increased by making the extending portion extending in the moving direction of the mesh belt from the first end portion of the arm face the hanging portion of the mesh belt from below. .

  FIG. 1 is a schematic front view showing a configuration of a continuous sintering furnace 10 which is a heat treatment apparatus according to an embodiment of the present invention. The continuous sintering furnace apparatus 10 includes a sintering furnace 1, a mesh belt 2, a driving roller 3, a pressing roller 4, a driven roller 5, and guide rollers 6 and 7.

  The sintering furnace 1 is a heat treatment furnace of the present invention, and performs a predetermined heat treatment on the workpiece. The mesh belt 2 conveys a work placed on the upper surface. The mesh belt 2 is stretched around a driving roller 3, a pressing roller 4, a driven roller 5, and guide rollers 6 and 7. The mesh belt 2 moves in a loop-shaped circulation path including a workpiece conveyance range from the supply position 8 through the sintering furnace 1 to the delivery position 9.

  The supply position 8 is arranged outside the inlet 1 </ b> A side of the sintering furnace 1. At the supply position 8, the work is placed on the upper surface of the mesh belt 2. The delivery position 9 is arranged outside the sintering furnace 1 on the outlet 1B side. At the delivery position 9, the workpiece is collected from the upper surface of the mesh belt 2.

  The driving roller 3, the pressing roller 4, and the guide rollers 6 and 7 are arranged outside the inlet 1 </ b> A side of the sintering furnace 1. The drive roller 3 is rotated by a rotational force supplied from a motor (not shown). The pressing roller 4 is in pressure contact with the driving roller 3 with a predetermined pressing force across the mesh belt 2. The mesh belt 2 is sandwiched between the driving roller 3 and the pressing roller 4. When the driving roller 2 rotates, tension is applied to the mesh belt 2, and the mesh belt 2 moves along the circulation path.

  The driven roller 5 is disposed outside the outlet 1 </ b> B side of the sintering furnace 1. The pressing roller 4, the driven roller 5 and the guide rollers 6 and 7 rotate as the mesh belt 2 moves.

  A pit 11 is provided below the supply position 8 outside the inlet 1 </ b> A side of the sintering furnace 1. The mesh belt 2 faces the pit 11 on the downstream side of the pressing roller 4 and the upstream side of the guide roller 6 in the moving direction.

  When the mesh belt 2 is stretched with time due to the use of the continuous sintering furnace 10, the mesh belt 2 hangs down on the downstream side of the pressure roller 4 having the weakest tension in the circulation path and on the upstream side of the guide roller 6. The hanging portion of the mesh belt 2 is accommodated in the pit 11.

  2A to 2C are a plan view, a front view, and a side view showing a configuration in the vicinity of the supply position 8 of the continuous sintering furnace apparatus 10. An elongation detection mechanism 20 is disposed on the bottom surface of the pit 11. The elongation detection mechanism 20 includes an arm 21, a weight 22 and a limit switch 23. However, the configuration of the elongation detection mechanism 20 is not limited to this.

  The arm 21 is arranged with its longitudinal direction orthogonal to the moving direction of the mesh belt 2. An intermediate portion between the first end portion 21A and the second end portion 21B is pivotally supported with a fulcrum 21C. The axial direction of the fulcrum is parallel to the moving direction of the mesh belt 2.

  An extension 24 extends in the direction parallel to the moving direction of the mesh belt 2 at the first end 21 </ b> A of the arm 21. Therefore, the arm 21 and the extending part 24 have an L shape in plan view. The extending portion 24 has a length approximately equal to the hanging portion 2 </ b> A of the mesh belt 2 housed in the pit 11 in the moving direction of the mesh belt 2.

  The weight 22 is an urging member of the present invention, and is attached between the fulcrum 21C and the second end 21B of the arm 21. The second end 21 </ b> B side of the arm 21 is urged downward by the weight 22.

  The limit switch 23 is a detection unit of the present invention, and supports the actuator 25 in a swingable manner. The limit switch 23 is disposed at a position where the free end 25 </ b> A of the actuator 25 faces the upper surface of the second end 21 </ b> B of the arm 21.

  When the length of the hanging portion 2A of the mesh belt 2 stored in the pit 11 exceeds a predetermined amount, the lower end portion of the hanging portion 2A comes into contact with the extending portion 24. When the length of the hanging portion 2A is further increased, the weight of the hanging portion 2A acts on the extending portion 24, and the extending portion 24 is pressed downward by the lower end portion of the hanging portion 2A.

  The weight of the weight 22 is lighter than the weight of the hanging portion 2A having a predetermined length. When the length of the hanging portion 2A exceeds a predetermined amount, the extending portion 24 is displaced downward together with the first end portion 21A of the arm 21, and the arm 21 swings around the fulcrum 21C. At this time, the second end 21B of the arm 21 is displaced upward and comes into contact with the actuator 25 from below. As a result, the actuator 25 swings, and the upward displacement of the second end portion 21B is detected by the limit switch 23.

  FIG. 3 is a block diagram illustrating a configuration of the control unit 30 of the continuous sintering furnace apparatus 10. The control unit 30 is configured by connecting input / output devices such as a limit switch 23, a motor driver 34, and a display driver 35 to a CPU 31 having a ROM 32 and a RAM 33.

  The CPU 31 controls each input / output device in an integrated manner based on a program written in the ROM 32 in advance, and stores data input / output during this time in the RAM 33.

  The limit switch 23 inputs a detection signal to the CPU 31 that the second end 21B of the arm 21 has been displaced upward.

  A motor 36 that supplies rotational force to the drive roller 3 is connected to the motor driver 34. The motor driver 34 drives the motor 36 based on drive data input from the CPU 31.

  A display 37 is connected to the display driver 35. The display driver 35 operates the display 37 based on display data input from the CPU 31.

  When the detection signal is input from the limit switch 23, the CPU 31 outputs display data to the display driver 35 and displays on the display 37 that the mesh belt 2 needs to be maintained.

  Note that the CPU 31 may count the number of detection signal inputs from the limit switch 23 and display that the mesh belt 2 should be replaced when the number of inputs reaches a predetermined number.

As described above, in the continuous sintering furnace 10, it is detected with a simple configuration that the amount of elongation of the mesh belt 2 exceeds a predetermined amount, and maintenance of the mesh belt 2 is necessary based on the detection result. Can be displayed, and the maintenance of the mesh belt 2 can be reliably performed at an appropriate timing.

1 is a schematic front view showing a configuration of a continuous sintering furnace apparatus 10 which is a heat treatment apparatus according to an embodiment of the present invention. It is the top view, front view, and side view which show the structure of the supply position 8 vicinity of the continuous sintering furnace apparatus 10. FIG. 3 is a block diagram illustrating a configuration of a control unit 30 of the continuous sintering furnace apparatus 10. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sintering furnace 2 Mesh belt 3 Drive roller 4 Press roller 5 Drive roller 6, 7 Guide roller 8 Supply position 9 Delivery position 11 Pit 20 Elongation detection mechanism 21 Arm 21A 1st edge part 21B 2nd edge part 21C Support point 22 Weight 23 Limit switch 24 Extension part

Claims (3)

An arm supported in a swingable manner with an intermediate portion between the first end and the second end as a fulcrum; a biasing member that biases the second end of the arm downward; and the arm display the second end of which gives a warning on the basis of the detection unit for outputting a detection signal by the contact between the second end, the detection signal output from the detecting unit when displaced upward And comprising
The first end side than the fulcrum in the arm is opposed to the hanging part of the mesh belt moving in a looped path from below ,
The axial direction of the fulcrum of the arm is parallel to the moving direction of the mesh belt,
The first end portion of the arm includes an extending portion extending in a direction parallel to the axial direction of the fulcrum, and is opposed to a hanging portion of the mesh belt from below in the extending portion,
The mesh belt elongation detecting device , wherein the urging member is a weight attached to the second end side of the fulcrum in the arm . A heat treatment furnace for heating the workpiece, and a mesh belt that moves in a loop-shaped circulation path, from the supply position outside the heat treatment furnace to the delivery position outside the heat treatment furnace via the inside of the heat treatment furnace A mesh belt for placing and transporting a workpiece on
Heat treatment the mesh belt elongation detecting device according to claim 1, wherein the first end portion side of the fulcrum in the arm opposite from below sag portion of the mesh belt outside of the heat treatment furnace apparatus. 3. The heat treatment apparatus according to claim 2 , further comprising a pit in which a hanging portion of the mesh belt is accommodated outside the heat treatment furnace, wherein the mesh belt elongation detecting device is disposed on a bottom surface of the pit.

Images