JP2009202322A - Safety device for train of manufacturing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety device for a train of manufacturing equipment capable of ensuring safety when a worker enters a work zone for work sufficiently while preventing reduction of production efficiency in the train of manufacturing equipment. <P>SOLUTION: This train of manufacturing equipment composed of a plurality of continuous equipment is provided with a safety fence surrounding the whole periphery of the train of manufacturing equipment, boundaries for dividing a region surrounded by this safety fence into a plurality of continuous zones in the direction of conveyance of an object to be manufactured, entrance doors provided in the safety fence per zone divided by the boundaries, door locking means for locking/unlocking each door, an operation means provided on an outer side of the safety fence to enable worker's inputting operation to enter or leave the zone, and a controlling means for starting stop operation of the equipment installed in only any zone when the operation means is operated to allow the worker to enter the zone and unlocking the door locking means of the door in only this zone upon completion of stopping the equipment. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a manufacturing facility row in which a plurality of facilities are connected and a manufacturing object is transported from one end of the facility toward the other end of the facility, and in particular, an operator in an area where the manufacturing facility row is installed. It relates to a safety device used when entering.

  Usually, in order to improve production efficiency, an on-line production equipment line formed by connecting various equipment such as heat treatment equipment, processing equipment, and inspection equipment is used for manufacturing steel pipes. For example, as a manufacturing equipment line when producing a boiler tube for thermal power generation by drawing, a drawing equipment line composed of a raw pipe inspection equipment, a pipe end heating equipment, a mouth drawing processing equipment, a heat treatment equipment, Typical examples of such equipment are straightening equipment, eddy current inspection equipment, cutting equipment, and chamfering equipment.

  In the manufacturing equipment row, each equipment operates automatically and the individual processes proceed. However, an operator may enter the installation area of the manufacturing equipment row and perform work. This on-site work is performed, for example, at the time of setup change in each facility, at the time of loading and unloading of the manufacturing object, at the time of visual inspection and maintenance of the manufacturing object, and at the time of material position correction work accompanying conveyance trouble. At the time of sensitivity calibration of inspection equipment, equipment failure, maintenance inspection and repair. Since the entry work is a work performed by the worker himself entering the operation area where each facility is installed, it is strongly required to secure safety to prevent the occurrence of personal injury. In the past, safety was ensured during on-site work by establishing a management system such as strengthening worker education and training.

  On the other hand, in many recent manufacturing sites, there is a tendency to actively introduce a machine safety system based on the international safety standard basic standard ISO12100 in order to prevent the occurrence of personal injury. Conventionally, the following devices have been proposed as safety devices for realizing a machine safety system.

  Patent Document 1 proposes a machine tool safety device. This safety device installs a safety fence that encloses the hazardous area of the machine tool, and holds the safety fence door open or closed by locking the position of the handle to the safety fence door provided on the safety fence. A lock mechanism, a lock release mechanism for unlocking the handle position, a door open detection means for detecting an open state of the safety fence door, and a door close detection means for detecting the closed state of the safety fence door are provided. . When the detection signals of the door closing detection means and the door opening detection means are ON and OFF, the machine tool can be operated. On the contrary, the detection signals of the door closing detection means and the door opening detection means are OFF and ON. At this time, the machine tool is controlled so that it cannot be operated.

  Patent Document 2 proposes a safety device in a device having a drive unit connected to an actuator. This safety device includes a detection unit that detects that an operator has touched the inside of the device during operation of the device, and an interlock mechanism that stops driving of the drive unit based on detection by the detection unit. is there. The interlock mechanism includes a delay circuit that sets the shortest time in which the worker can access the drive unit from the detection by the detection means as an upper limit, and stops the actuator within this time.

  Patent Document 3 proposes a safety device for an automatic machine having a power source such as a motor or a solenoid. This safety device includes a sensor provided to partition a dangerous area of an automatic machine, a stop processing unit that performs software processing for stopping processing by a signal from the sensor, a power source after a predetermined time has elapsed since the operation of the stop processing unit. And a power source shut-off unit that shuts off the power.

JP 2001-336694 A JP 2007-94927 A JP-A-5-322095

  By the way, when the machine safety system is newly introduced in the above-described manufacturing equipment row for ensuring safety at the time of entry work, there is a problem if the safety devices proposed in Patent Documents 1 to 3 are employed. Since this is composed of a set of a plurality of facilities in which the manufacturing facility row is continuous, a measure for ensuring safety is taken compared to a single machine or device provided with the safety device proposed in Patent Documents 1 to 3 above. This is due to a significant increase in scope and degree of danger.

  For example, a safety fence that surrounds the entire circumference of the manufacturing equipment line is installed as a safety device during entry work in the manufacturing equipment line, and a door used when an operator enters the installation area of the manufacturing equipment line. It is conceivable to adopt the technical matters of the safety device proposed in Patent Document 1 for this door.

  In this case, during automatic operation, the safety fence and the closed door prevent the operator from entering the safety fence. At the time of entry work, the door is opened, and all the equipment in the manufacturing equipment line is stopped by the operation of the door opening detecting means. For this reason, although safety can be ensured at the time of entry work including during automatic operation, there is a problem that production efficiency as a whole of the production equipment row is greatly reduced as a result of stopping all facilities that are not directly involved in the entry work.

  In addition, as a safety device at the time of entry work in the manufacturing facility line, a technical means of the safety device proposed in Patent Document 2 is adopted, and detection means for detecting that an operator touches the inside of the operating facility. It is conceivable to provide it. In this case, when the detection is performed by the detection means, the worker touches the inside of the operating equipment, and therefore it is dangerous if the equipment is not stopped immediately. Such a situation occurs not only during entry work but also during automatic operation. Therefore, the safety device in this case is extremely unsuitable as a machine safety system for ensuring safety.

  Further, it is conceivable to employ the technical matters of the safety device proposed in Patent Document 3 as a safety device at the time of entry work in the manufacturing equipment row, and to install a sensor so as to surround the entire circumference of the manufacturing equipment row. In this case, when the worker is detected by the sensor during the entry operation, all the facilities in the manufacturing equipment row are stopped, so that there is a problem that the production efficiency of the entire manufacturing equipment row is greatly reduced.

  The present invention has been made in view of the above problems, and provides a safety device capable of sufficiently ensuring safety during entry work while suppressing a decrease in production efficiency in a production facility row. Objective.

  In order to achieve the above object, a safety device for a manufacturing equipment row according to the present invention is applied to a manufacturing equipment row in which a plurality of equipments are connected and a product to be manufactured is transported from one equipment to another equipment. A safety fence that encloses the entire circumference of the manufacturing equipment line, a boundary that divides the area surrounded by the safety fence into a plurality of areas continuously in the conveyance direction of the manufacturing object, and a boundary. The entrance doors provided on the safety fence for each area, the door lock means for locking / unlocking each door, and the outside of the safety fence are provided for input operation to enter or exit the area. When the operation means to enable and when this operation means is operated to enter any area, the operation of stopping the equipment included only in the area is started, and after the stop of the equipment is completed, the area Control means for unlocking only the door lock means, Characterized by comprising.

  According to such a configuration, when the entry work is performed, the safety fence door is unlocked with the equipment stopped in the corresponding area, so the operator opens the unlocked door and You can enter the area safely and work safely in the area. On the other hand, in areas other than the said area, since operation | movement continues without stopping, the fall of the production efficiency as the whole manufacturing equipment row | line | column can be suppressed.

  Here, it is preferable that a detection unit that reacts when a person crosses the boundary is provided at each boundary, and the control unit stops all the facilities constituting the manufacturing facility row when the detection unit reacts. At this time, it is preferable to provide an auxiliary safety fence at each boundary that is lower than the conveyance height when the manufacturing object crosses the boundary, and to provide the detection means above the auxiliary safety fence.

  Further, the control means can determine that the stop of the equipment has been completed when the movable part of the equipment reaches the safe stop position after the stop operation of the equipment has started. In addition, the control means can determine that the facility stop has been completed when a predetermined time has elapsed since the facility stop operation started.

  Furthermore, the control means can lock the unlocked door lock means when the operating means is operated to evict from the area.

  Moreover, it is preferable to provide the operation switch operated in order to operate an installation, and the self-holding release means which cancels the self-holding function of the operation switch operation. At this time, the operation switch may be provided on an operation panel installed outside the safety fence, or may be provided on a remote operation panel that is movable.

  According to the safety device of the manufacturing equipment row of the present invention, in the area where the entry work is performed, the door of the safety fence is unlocked with the equipment stopped, so that the worker can safely enter the area. In addition, since the equipment continues to operate without stopping in the areas other than the area, it is possible to suppress a decrease in the production efficiency of the entire manufacturing equipment line.

Below, the embodiment of the safety device of the manufacturing equipment line of the present invention is described in detail.
FIG. 1 is an overall configuration diagram schematically showing an example of a manufacturing equipment line employing the safety device of the present invention. The manufacturing equipment row 1 shown in the figure is a mouthpiece equipment row used for manufacturing a boiler tube for thermal power generation by drawing.

  As shown in the figure, the production equipment row 1 is composed of a material carry-in equipment 20, a raw pipe inspection equipment 30, a pipe end heating equipment 40, a mouth drawing processing equipment 50, and a material carry-out equipment 60. It is connected in order through a transport facility that does not. The entire operation of the manufacturing facility row 1 is controlled by a control device 2 shown in FIG.

  The material carry-in facility 20 includes a material charging rack 21 that receives the raw pipes to be processed in the manufacturing equipment row 1. In the material charging rack 21, a plurality of raw pipes are collected by a slinging operation using a crane by an operator. Supplied. The raw pipes supplied to the material input rack 21 are sequentially sent to the inlet-side transport table 22 corresponding to the inlet to the raw pipe inspection equipment 30.

  The raw pipe inspection facility 30 includes a receiving stage 31 that receives raw pipes from the entrance-side transfer table 22 of the material carry-in equipment 20, a pre-inspection table 32 that sequentially receives raw pipes from the receiving stage 31, an inspection table 33, and a post-inspection table 34. With. In the inspection table 33, an operator performs a visual inspection of the raw pipe, and the raw pipe that has passed this inspection is sent out to the pipe end heating equipment 40 via the post-inspection table 34. At this time, in the visual inspection on the inspection table 33, if a minor defect such as a shallow surface flaw is found in the element tube, the element tube is subjected to pipe end heating equipment after removing the defect by care of a grinder or the like. 40. When the defect is severe, the raw pipe is not sent to the pipe end heating equipment 40 but taken out of the manufacturing equipment line 1 as a defective material.

  The pipe end heating equipment 40 includes a heating furnace 41 for heating one pipe end of the raw pipe to be subjected to squeezing. As the heating furnace 41, an IH (induction heating) type or a gas-fired heating type can be applied, but the processing capacity (time required for heating per raw tube) that can improve production efficiency is superior. Therefore, an IH heating furnace is preferable. The pipe end heating equipment 40 continuously heats the raw pipes sequentially sent from the post-inspection table 34 of the raw pipe inspection equipment 30 by a heating furnace 41, and squeezes the raw pipe whose pipe ends are heated to a predetermined temperature. Sequentially sent to the processing equipment 50.

  The squeezing processing equipment 50 includes a squeezing machine 51 in order to process the tube end of the raw tube into a candle-like or constricted mouth-squeezing shape. As the mouth squeezer 51, a method of squeezing with a rotary wedger, a method of squeezing with a hydraulic pressure, or a method of smashing with an air hammer or a crank hammer can be applied. The squeezing processing equipment 50 sequentially squeezes the raw pipe sent from the pipe end heating equipment 40 by a squeezing machine 51, and the raw pipe having a squeezed portion formed at the pipe end is supplied to the material carrying out equipment 60. Send out sequentially.

  The material carry-out facility 60 includes a material carry-out rack 61 that receives and accumulates the raw tube in which the squeezed portion is formed from the squeezing processing facility 50. A plurality of the raw tubes accumulated in the material carry-out rack 61 are carried out from the manufacturing equipment row 1 together by a slinging operation using a crane by an operator.

  As described above, the manufacturing equipment row 1 shown in FIG. 1 transports the raw pipes as the manufacturing objects carried into the material carry-in equipment 20 toward the material carry-out equipment 60, and in the process, the raw pipe inspection equipment 30, By passing through the tube end heating equipment 40 and the mouth drawing processing equipment 50 in order, an elementary tube in which a mouth drawing portion is formed at the tube end is manufactured. The raw tube in which the aperture portion is formed is unloaded from the manufacturing equipment row 1 and is drawn by a drawing machine.

  A safety device employed in such a manufacturing facility row 1 will be described. As shown in FIG. 1, the safety that surrounds the entire circumference of the manufacturing equipment row 1 composed of the material carry-in equipment 20, the raw pipe inspection equipment 30, the pipe end heating equipment 40, the mouth drawing processing equipment 50, and the material carry-out equipment 60. A fence 3 is installed. The safety fence 3 is a metal grid, and prevents an operator from inadvertently entering the installation area of the manufacturing equipment row 1. The safety fence 3 is in contact with the movable part of each equipment constituting the manufacturing equipment row 1 and the manufacturing object (raw pipe) to be transported even if the worker extends his hand over the safety fence 3 or from the gap. It is installed at a height and distance that is impossible. The safety fence only needs to limit the entry of workers and the entry of part of the worker's body. The safety fence is made of fences, mesh-like gap plates, transparent reinforced plastic plates, etc. May be.

  Here, in the manufacturing equipment row 1 shown in FIG. 1, an operator enters the inside of the safety fence 3 and works in the installation area of the manufacturing equipment row 1 in the following situation.

  Since the unloading of the raw pipe into the material carry-in facility 20 is performed by the worker using a crane to perform slinging, the worker enters the installation area of the material carry-in facility 20 at that time. Similarly, since the unloading of the raw pipe from the material unloading facility 60 is performed by the worker using a crane to perform slinging, the worker enters the installation area of the material unloading facility 60 at that time.

  In the tube inspection equipment 30, the tube is transported laterally in a direction perpendicular to the longitudinal direction. Therefore, when the tube is visually inspected and maintained, the pre-inspection table 32 and the inspection table 33 are bridged. The pass arm to be opened is opened, and the worker enters the passage that appears, thereby performing visual inspection and maintenance.

  When changing the setup at each facility, an operator enters the installation area of the corresponding facility. For example, in the stage change of the squeezing processing equipment 50, there is a work of replacing the processing tool of the squeezing machine 51.

  When troubles occur in the transfer of raw pipes at each facility, it is necessary for an operator to enter the recovery area of the corresponding facility and perform recovery work. A conveyance trouble is likely to occur when, for example, a long blank tube is sent out to a conveyor line by a kicker, when it is linearly conveyed in the longitudinal direction by the conveyor, or when it is laterally conveyed by a chain conveyor or rolling.

  In addition, when an equipment failure occurs, maintenance and repairs, etc., it is necessary for an operator to enter the work area of the relevant equipment.

  For such entry work, the region surrounded by the safety fence 3 is partitioned into a plurality of areas continuously in the direction of transporting the raw pipe that is the manufacturing object. In the manufacturing equipment row 1 shown in FIG. 1, an area surrounded by the safety fence 3 is divided into five areas 11, 12, 13, 14, and 15. Is included. The second area 12 includes a receiving stage 31 of the raw tube inspection equipment 30, and the third area 13 includes a pre-inspection table 32, an inspection table 33, and a post-inspection table 34. The fourth zone 14 includes a tube end heating facility 40 and a mouth drawing processing facility 50, and the fifth zone 15 includes a material unloading facility 60.

  Auxiliary safety fences 5A, 5B, 5C, and 5D are provided on the four boundaries 4A, 4B, 4C, and 4D that divide the region surrounded by the safety fence 3 into five areas 11-15. The auxiliary safety fences 5A to 5D are made of a metal lattice, and are lower than the conveyance height when the raw pipes that are being conveyed cross the boundaries 4A to 4D where they are provided. Therefore, the auxiliary safety fences 5 </ b> A to 5 </ b> D do not interfere with the raw pipe being transported, and an operator carelessly moves from one area to an adjacent area, for example, from the first area 11 to the second area 12. Prevent intrusion.

  In the boundaries 4A to 4D, boundary sensors 6A to 6D are provided above the auxiliary safety fences 5A to 5D, which react when the worker exceeds this. As the boundary sensors 6 </ b> A to 6 </ b> D, photoelectric tubes each composed of a light emitting element group and a light receiving element group facing each other can be adopted. When a phototube is used as the boundary sensors 6A to 6D, the phototube reacts when light rays reaching the light receiving element group from the light emitting element group are blocked by the operator.

  The safety fence 3 is provided with doors 7A to 7E that can be opened and closed corresponding to the first to fifth areas 11 to 15, respectively. The first to fifth doors 7A to 7E are used when an operator enters the corresponding areas 11 to 15. The first to fifth doors 7A to 7E are provided with first to fifth door lock devices 8A to 8E for locking / unlocking the doors. An electromagnetic lock can be adopted as the door lock devices 8A to 8E.

  On the outside of the safety fence 3, an operation panel 9 </ b> A for carrying-in equipment capable of performing input operations relating to various operations of the material carrying-in equipment 20, and an operation panel for inspection equipment capable of performing input operations relating to various operations of the raw pipe inspection equipment 30. 9BC, a main operation panel 9D capable of input operations related to various operations of the tube end heating equipment 40 and the mouth drawing processing equipment 50, and an unloading equipment operation panel 9E capable of input operations related to various operations of the material carry-out equipment 60. And are installed.

  The carry-in equipment operation panel 9A is provided with a first on-operation switch 10A (see FIG. 2 described later) that is operated when an operator enters the first area 11. In the inspection equipment operation panel 9BC, a second entry operation switch 10B (see FIG. 2) operated when an operator enters the second area 12, and an operator enters the third area 13. A third on / off operation switch 10C (see FIG. 2) is provided. The main operation panel 9D is provided with a fourth on / off operation switch 10D (see FIG. 2) that is operated when an operator enters the fourth section 14, and the unloading equipment operation panel 9E includes a fifth A fifth on / off switch 10E (see FIG. 2) that is operated when an operator enters the area 15 is provided. These on-site operation switches 10A to 10E may be provided in one operation panel or a centralized management device on which the control device 2 is mounted. As the on / off switch 10A to 10E, a changeover switch or a push button switch can be adopted.

  FIG. 2 is a block diagram showing an electrical configuration of the safety device in the manufacturing equipment row shown in FIG. The control device 2 that controls the entire operation of the manufacturing equipment column 1 is composed of a microcomputer, a sequencer, and the like. The first to fifth turn-on operation switches 10 </ b> A to 10 </ b> E are operated before and after the entry work in the first to fifth sections 11 to 15, respectively, and send each output signal to the control device 2. The control device 2 responds to an input signal from each of the first to fifth on-off operation switches 10A to 10E, the material carry-in equipment 20, the raw pipe inspection equipment 30, the pipe end heating equipment 40, the mouth drawing processing equipment 50, and the material. A control signal is sent to the unloading facility 60 and the first to fifth door locking devices 8A to 8E, and a signal for making the boundary sensors 6A to 6D actuated or deactivated is sent.

  Specifically, from the state in which the manufacturing facility row 1 is operating in automatic operation, the first to fifth on-site operation switches 10A to 10E are operated in the on-site work in the first to fifth zones 11 to 15. Then, the control device 2 responds to the input signals from the operated on / off operation switches 10A to 10E, and the material carry-in equipment 20, the raw pipe inspection equipment 30, the pipe end heating equipment 40, the mouth drawing processing equipment 50 or A signal for stopping the material carry-out facility 60 is sent. At this time, the control device 2 applies the on-site operation switches 10A to 10E having an input signal among the material carry-in facility 20, the raw tube inspection facility 30, the pipe end heating facility 40, the mouth drawing processing facility 50, and the material carry-out facility 60. A stop signal is sent only to the equipment included in the corresponding areas 11 to 15, and no stop signal is sent to the equipment included in the area corresponding to the on-off operation switch having no other input signal.

  At the same time, the control device 2 regulates the operation input of the operation switch operated to operate the equipment with respect to the operation panels 9A to 9E in which the operation switches 10A to 10E are operated.

  When the stop of the equipment that has received the stop signal is completed, the control device 2 controls the door lock devices 8A to 8E with respect to the doors 7A to 7E in the areas 11 to 15 corresponding to the on-off operation switches 10A to 10E having the input signals. Send a signal to unlock. At the same time, the control device 2 sends a signal to activate the boundary sensors 6A to 6D only in the areas 11 to 15 corresponding to the entry operation switches 10A to 10E having the input signals.

  Thereby, in the 1st-5th areas 11-15, in the area where the worker intended entry work, the door of the safety fence is unlocked in a state where the equipment is stopped. The unlocked door can be opened to enter the area safely, and the entry work can be done safely in the area. On the other hand, in areas where workers do not intend to enter, the equipment continues to operate without stopping, so the decline in production efficiency of the entire manufacturing equipment line is suppressed, and the doors of the safety fence are locked. Therefore, the operator can be prevented from entering the area and safety can be ensured.

  However, as long as the worker is working in an area intended for on-site work, it is safe because the equipment is stopped, but the equipment is operating in the area adjacent to the area. Therefore, it is dangerous if an operator inadvertently enters the adjacent area beyond the boundary. For this reason, when the worker crosses the boundaries 4A to 4D, the boundary sensors 6A to 6D in the activated state react to send a detection signal to the control device 2, and the control device 2 responds to the detection signal, A stop signal is sent to all equipment in the manufacturing equipment row 1. As a result, all the facilities constituting the manufacturing facility line 1 are brought to an emergency stop, so that even if an operator accidentally enters the adjacent area from the area where the worker is entering, the safety of the operator can be ensured. it can.

  When the entry work is completed, the worker goes out of the area where the entry work is performed through the unlocked door and closes the door. Thereafter, when the first to fifth turn-on operation switches 10A to 10E are operated, the control device 2 responds to an input signal from the turn-on operation switches 10A to 10E, and the door lock devices 8A to 8A to the doors 7A to 7E. A signal for locking 8E and a signal for deactivating the boundary sensors 6A to 6D are transmitted. At the same time, the control device 2 permits operation input of the operation switches to the operation panels 9A to 9E in which the on-operation switches 10A to 10E were operated.

  Then, the operation of the operation panels 9A to 9E is performed in order to restart the stopped material carrying-in facility 20, the raw pipe inspection facility 30, the tube end heating facility 40, the squeezing processing facility 50, or the material unloading facility 60. When the switch is operated, the control device 2 sends an operation start signal to the stopped facility. As a result, the operation of the equipment stopped due to the entry work is resumed. At this time, since the doors 7A to 7E are locked, the safety fence 3 and the doors 7A to 7E prevent the worker from entering the safety fence 3 and sufficiently ensure the safety of the worker. .

  For example, when carrying a raw pipe into the material carry-in facility 20, the operator operates the first on-off operation switch 10A. As a result, the equipment in the first area 11 is stopped, and the door 7A leading to the area 11 is unlocked. The worker can enter the first area 11 from the door 7A and safely carry in the raw pipe by a slinging operation using a crane. At this time, the facilities in the other second to fifth areas 12 to 15 are continuously operated.

  When unloading the raw tube from the material unloading facility 60, the operator operates the fifth on / off switch 10E. As a result, the equipment in the fifth area 15 is stopped and the door 7E is unlocked to the area 15, and the operator can perform the pipe operation in the fifth area 15 by a slinging operation using a crane. Can be safely carried out. At this time, the facilities in the other first to fourth areas 11 to 14 continue to operate.

  When performing a visual inspection and maintenance of the raw tube, the operator operates the third on / off operation switch 10C. As a result, the equipment in the third area 13 is stopped and the door 7C is unlocked to the area 13. The operator can open the pass arm between the pre-inspection table 32 and the inspection table 33 in the third area 13 and enter the inside of the appearing passage and perform visual inspection and maintenance safely. At this time, the facilities in the other first, second, fourth and fifth zones 11, 12, 14 and 15 continue to operate. When the visual inspection and the care are completed, the operator closes the pass arm in sequence and then withdraws to the outside of the safety fence 3 and operates the third on / off operation switch 10C and the operation switch to install the equipment in the third area 13. The operation is resumed, and the raw pipe after visual inspection and care is conveyed to the next pipe end heating equipment 40.

  Such a safety device is an example applied to a mouth-opening equipment row, but can also be applied to various manufacturing equipment rows in which a plurality of facilities are connected. For example, it can be applied to a refining equipment row in which a raw pipe in which a mouth portion is formed through a mouth drawing equipment row is drawn by a drawing machine, and the steel pipe after drawing is used as a manufacturing object. The refining equipment line includes, for example, heat treatment equipment for improving and uniforming the quality of steel pipes, straightening equipment for correcting bending of steel pipes, eddy current flaw inspection equipment for detecting surface defects and internal defects of steel pipes, It comprises cutting equipment for cutting the steel pipe into a predetermined length, chamfering equipment for chamfering the cut surface of the steel pipe.

  In addition, in the safety equipment of the manufacturing equipment row described above, whether or not the equipment in the target area has been stopped when entering, that is, the control device sends a stop signal to the equipment in the target area. It can be determined as follows whether the unlocking signal is sent to the door lock device of the door to the area at a certain time after the sending and the equipment starts the stop operation.

  When the target equipment has a movable part that performs an operation of one cycle, such as a kicker, a stopper, or a conveyor, for example, the controller stops the equipment when the movable part reaches the safe stop position. It determines with having completed, and sends an unlocking signal to a door locking device. The arrival of the movable part to the safe stop position can be recognized by providing a sensor that reacts when the movable part is at the safe stop position and receiving a detection signal from the sensor. The safe stop position of the movable part at this time is a position where safety can be secured in one cycle of operation.

  FIG. 3 is a schematic diagram for explaining the operation of the kicker. The kicker 71 is a movable part that repeatedly rises and descends. As shown in FIG. 5A, the kicker 71 receives the pipe 70 in the lowered state, and ascends as shown in FIG. 70 is lifted and sent to the transport destination. In the state where the kicker 71 is lowered, the conveyance of the raw tube 70 does not proceed, so the position where the kicker 71 is lowered becomes the safe stop position of the kicker.

  FIG. 4 is a schematic diagram for explaining the operation of the stopper. The stopper 72 is a movable part that repeatedly descends and rises. As shown in FIG. 5A, the stopper 72 receives the raw pipe 70 that is being transported in the raised state, and descends as shown in FIG. To release the tube. Since the conveyance of the raw tube 70 does not proceed in the state where the stopper 72 is raised, the position where the stopper 72 is raised becomes the safe stop position of the stopper.

  When the target equipment has a moving part that stops running after inertial force even if it receives a stop signal, such as a rotary blade of a cutting machine in the cutting equipment, the control device sends a stop signal to the equipment. Then, when a predetermined time has elapsed, it is determined that the facility has been stopped, and an unlock signal is sent to the door lock device. The elapse of the predetermined time can be recognized by comparing the time measured by the timer with the time required for stopping each movable part registered in the memory.

  By the way, in the safety device of the manufacturing equipment row | line | column mentioned above, in the state which the equipment stopped, trouble may arise in the entry work. For example, in the case of equipment failure, on-site work such as maintenance inspection and repair, after repairing and adjusting the equipment to some extent, the operation of the equipment is repeatedly started and stopped for operation confirmation and fine adjustment. An operation (hereinafter referred to as “inching operation”) is required. In consideration of such a situation, the following configuration can be adopted for the safety device of the manufacturing equipment column.

  When it is necessary to perform an inching operation during entry work, the operator shifts to the inching operation mode by the operator's operation, and the control device releases the restriction of the operation input of the operation switch in each operation panel, and The self-holding function of the operation switch operation is released. The operation of the equipment is normally controlled by a self-holding circuit. Once the operation switch is operated, the equipment continues to operate until the operation stop switch is operated. With the release of the self-holding function, the equipment operates only while the operation switch is operated, regardless of the operation of the operation stop switch.

  FIG. 5 is a sequence diagram showing an example of a self-holding circuit relating to the operation of the equipment in the safety device of the manufacturing equipment row of the present invention, where FIG. 5 (a) shows a normal state, and FIG. The state in the operation mode is shown. Here, push button switches are employed as the operation switch and the operation stop switch, and the operation of the conveyor of the facility will be described as an example.

  As shown in FIG. 5A, when the operation switch PB1 is pushed down in a normal state where the self-holding circuit functions, the conveyor is operated. At this time, since the contact S is connected, the relay Ry1 is turned ON, and even when the operation switch PB1 is released, the circuit relating to the operation of the conveyor is maintained, and the conveyor continues to operate. Thereafter, when the operation stop switch PB2 is pushed down, the relay Ry2 is turned OFF, whereby the circuit relating to the operation of the conveyor is cut and the conveyor is stopped.

  On the other hand, as shown in FIG. 4B, when the contact switch S is switched to the non-connected state by the shift operation to the inching operation mode by the operator, when the operation switch PB1 is pushed down, Although the conveyor operates, the relay Ry1 remains OFF because the contact S is not connected. For this reason, when the self-holding circuit does not function and the operation switch PB1 is released, the circuit relating to the operation of the conveyor is cut and the conveyor is stopped.

  If such a self-holding circuit with the contact S added is adopted, the operation switch operation self-holding function can be canceled by operating the inching operation mode, and the equipment is operated only while the operation switch is being operated. It becomes possible.

  After shifting to the jogging operation mode, the operator can perform jogging operations simply by depressing and releasing the operation switch, so that it can operate on equipment that has been repaired or adjusted to some extent. Confirmation and fine adjustment can be performed. At this time, even if the worker who performs the work remains in the area where the equipment is installed and observes the operation of the equipment, the operation of the equipment is insignificant, and the operation is performed exclusively. If the operator releases the operation switch push-down operation, the equipment is stopped, so safety is ensured.

  However, the entry work is performed using the inching operation mode in most cases when the entire manufacturing equipment line is stopped for a long time, such as during maintenance and inspection. In this case, by the transition operation to the inching operation mode, the control device releases the operation input restriction and the self-holding function for the operation switches of all the facilities constituting the manufacturing facility row. Furthermore, all the door locking devices can be unlocked and all the boundary sensors can be deactivated.

  Here, the operation switch operated in the inching operation mode may be provided on each operation panel arranged outside the safety fence. In this case, the operator operates the operation switch while operating the facility switch. It may be difficult to confirm the operation of the system or to identify another worker remaining in the installation area of the facility. For this reason, a portable remote control panel can be prepared, and an operation switch operated in an inching operation mode can be provided on the remote control panel. As a result, the operator who performs operations can carry out operation of the operation switch while carrying the remote control panel and entering the installation area of the equipment, and confirming the operation of the equipment and other workers. Can do.

  In addition, the jogging transition operation switch operated when shifting to the jogging operation mode may be provided on each operation panel, but can also be provided in a centralized management device equipped with a control device. It is. This is because the jogging operation mode causes a state in which the equipment is operated during the on-site work, and thus cannot ensure safety when used frequently in normal operations. For the same reason, it is preferable that the operation of the jogging transition operation switch can be performed only by a specific authorized operator. In other words, when the jogging operation switch is operated, the operation of the jogging operation switch is disabled unless it is confirmed that the user is a specific worker by inputting a password, authenticating a fingerprint, or inserting a dedicated key. It is preferable.

  In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, there is no limitation on the facilities constituting the manufacturing facility row, and there is no limitation on the number of areas that divide the area surrounded by the safety fence. In short, it is possible to set an area for each area where entry work is performed.

  According to the safety device of the manufacturing equipment column of the present invention, when an operator performs on-site work, by performing an input operation of an on-site operation switch corresponding to the corresponding area, the equipment is stopped in the area. The door of the safety fence is unlocked. For this reason, the operator can open the unlocked door and enter the area safely, and can enter the area safely in the area. On the other hand, in areas other than the said area, since operation | movement continues without stopping, the fall of the production efficiency as the whole manufacturing equipment row | line | column can be suppressed. Therefore, the present invention is extremely useful because it is possible to sufficiently ensure the safety at the time of entry work without hindering the high productivity in the manufacturing equipment row.

It is a whole block diagram which shows typically an example of the manufacturing equipment row | line | column which employ | adopted the safety device of this invention. It is a block diagram which shows the electrical structure of the safety device of the manufacturing equipment row | line | column shown in FIG. It is a schematic diagram for demonstrating operation | movement of a kicker. It is a schematic diagram for demonstrating operation | movement of a stopper. It is a sequence diagram which shows an example of the self-holding circuit regarding the operation | movement of the installation in the safety device of the manufacturing equipment row | line | column of this invention, The figure (a) shows a normal state, The figure (b) is in an inching operation mode. Indicates the state.

Explanation of symbols

1 Manufacturing equipment row 2 Control device 3 Safety fence 4A, 4B, 4C, 4D Boundary 5A, 5B, 5C, 5D Auxiliary safety fence 6A, 6B, 6C, 6D Boundary sensor 7A, 7B, 7C, 7D, 7E Door 8A, 8B , 8C, 8D, 8E Door lock device 9A, 9BC, 9D, 9E Operation panel 10A, 10B, 10C, 10D, 10E On-site operation switch 11, 12, 13, 14, 15 Area 20 Material carry-in equipment 21 Material input rack 22 Inlet Side transfer table 30 Element tube inspection equipment 31 Receiving stage 32 Pre-inspection table 33 Inspection table 34 Post-inspection table 40 Pipe end heating equipment 41 Heating furnace 50 Port drawing processing equipment 51 Port drawing machine 60 Material carry-out equipment 61 Material carry-out rack

Claims (9)

It is a safety device applied to a manufacturing facility row in which a plurality of facilities are connected and a manufacturing object is transported from one end of the facility toward the other end of the facility,
A safety fence that encloses the entire circumference of the manufacturing equipment line, a boundary that divides the area surrounded by the safety fence into a plurality of areas continuously in the conveyance direction of the manufacturing object,
A door for entering the safety fence for each area separated by a boundary;
Door locking means for locking / unlocking each door;
An operating means provided outside the safety fence and enabling an input operation to enter or leave the area;
When this operation means is operated to enter any area, the stop operation of the equipment included only in the area is started, and after the stop of the equipment is completed, the door lock means for the door only in the area And a control device for unlocking the safety device of the manufacturing equipment line. At each boundary, there is a detection means that reacts when a person crosses the boundary,
2. The safety device for a manufacturing equipment row according to claim 1, wherein the control means stops all equipment constituting the manufacturing equipment row when the detecting means reacts.   The manufacturing method according to claim 2, wherein an auxiliary safety fence lower than a conveyance height when the manufacturing object crosses the boundary is provided at each boundary, and the detection means is provided above the auxiliary safety fence. Equipment row safety device.   The control means determines that the stop of the equipment is completed when the movable part of the equipment reaches the safe stop position after the stop operation of the equipment has started. A safety device for the manufacturing equipment line described in 1.   The control means determines that the stop of the equipment has been completed when a predetermined time has elapsed since the start of the equipment stop operation. Safety device.   The safety of the manufacturing equipment row according to any one of claims 1 to 5, wherein the control means locks the unlocked door lock means when the operation means is operated to evict from the area. apparatus. An operation switch operated to operate the equipment;
6. The safety device for a manufacturing equipment row according to claim 1, further comprising self-holding release means for releasing the self-holding function of the operation switch operation.   8. The safety device for a manufacturing equipment column according to claim 7, wherein the operation switch is provided on an operation panel installed outside the safety fence.   8. The safety device for a manufacturing equipment row according to claim 7, wherein the operation switch is provided on a remote control panel that is freely movable.

Images