JP5044994B2 - Processing machine with safety device to prevent pinching - Google Patents

Description

  The present invention relates to a processing machine that presses and joins plate materials or between a plate material and a member, and particularly relates to a processing machine equipped with a pinching prevention safety device suitable for preventing a human body from being caught.

  In the processing machine, plate members or members having a screw thread are sandwiched and melted and solidified by a device having a pressurizing mechanism. Therefore, the plate member or the members are joined by generating heat and generating heat. As described above, since the heat is caused to flow through the electrode, the detection unit is damaged, and the electrode cannot be provided with a detection function. In addition, the caulking device is provided with a safety device that confirms the continuity between the upper mold and the lower mold and prevents them from being pinched. When caulking using a body material, the safety device must be released and the operator must visually check the safety. The operator is sandwiched between the sandwiching pressure mechanism or the pressure shear mechanism. There is a problem of being damaged. Conventionally, countermeasures have been taken by attaching a safety cover to the shearing part of a device having a pressure shearing mechanism that sandwiches a plate material or member between the upper die and the lower die. If a person enters, the person who performs the processing will be damaged.

  [Patent Document 1] includes a first tool part that performs a machining operation in the direction of the second tool part in order to perform a machining process on a workpiece, and light is transmitted through an open gap formed between the tool parts. Is detected by the receiving unit including the matrix-shaped light receiving elements, and the photoelectric sensor monitors the three-dimensional protection region between the tool parts, and individual light receiving elements or a specific group of light receiving elements are detected. It is described that the first tool is stopped when no light is received.

JP 2005-319517 A

  The machine tool described in [Patent Document 1] irradiates light along the length direction of the upper tool at an open gap under the upper tool, and a finger is arranged on the uneven portion of the lower tool. However, there is a problem that it cannot be detected.

  An object of the present invention is to provide a processing machine equipped with a safety device that can detect the presence or absence of a human body prior to the tip of an electrode and prevent the electrode from being damaged by heat generation.

  Another object of the present invention is to provide a processing machine provided with a safety device that can detect the presence or absence of a human body prior to the tip of the upper mold.

In order to achieve the above object, an upper electrode installed at the upper part of the main body and moving up and down, an upper detector descending prior to the upper electrode and spaced apart from the upper electrode, and a lower part of the main body A lower electrode to be installed; a lower detector provided at an upper portion of the lower electrode at a distance from the lower electrode; and a current for supplying current to the upper detector or the lower detector. A supply unit, a current sensor for detecting a current flowing from the upper detector in the lower detector, and a control unit for controlling the upper electrode to move up based on a current amount detected by the current sensor; It is equipped with. Or an upper electrode installed on the upper part of the main body and moving up and down; an upper detector that descends prior to the upper electrode and is spaced apart from the upper electrode; and a lower electrode installed on the lower part of the main body A lower detector provided at an upper portion of the lower electrode at a distance from the lower electrode, facing the upper detector, a current supply unit for supplying current to the upper detector or the lower detector, and the upper The detector includes a current sensor that detects a current flowing from the lower detector, and a control unit that controls the upper electrode to move up based on the amount of current detected by the current sensor. .

An upper mold that is installed on the upper part of the main body and moves up and down; an upper detector that descends prior to the upper mold and is spaced apart from the upper mold; and a lower mold that is installed on the lower part of the main body A lower detector provided at an upper portion of the lower die at a distance from the lower die, facing the upper detector, a current supply unit for supplying current to the upper detector or the lower detector, and the lower portion The detector includes a current sensor that detects a current flowing from the upper detector, and a control unit that controls the upper die to move up based on the amount of current detected by the current sensor. . Or an upper mold that is installed at the top of the main body and moves up and down; an upper detector that is lowered prior to the upper mold and is spaced apart from the upper mold; and a lower mold that is installed at the lower portion of the main body A lower detector provided at an upper portion of the lower die at a distance from the lower die, facing the upper detector, a current supply unit for supplying current to the upper detector or the lower detector, and the upper portion The detector includes a current sensor that detects a current flowing from the lower detector, and a control unit that controls the upper die to move up based on the amount of current detected by the current sensor. .

  According to the present invention, a process provided with a safety device that can reliably detect a human body in advance of electrode lowering by a detector around the electrode tip without being damaged by heat generation of the electrode and prevent pinching by the electrode. Can provide a machine.

  Embodiment 1 of the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view of a processing machine according to the present embodiment, FIG. 2 is an enlarged side view showing a sandwiching pressurization mechanism section, and FIG. 3 is a cross-sectional view of the sandwiching pressurization mechanism section.

  A cylinder 1 is installed in the upper part of the main body 15 of the processing machine, an upper electrode holder 2 is provided in the lower part of the cylinder 1, and an upper electrode 3 is held in the upper electrode holder 2. When the operator operates the foot switch 10, the cylinder 1 moves up and down, and the upper electrode holder 2 and the upper electrode 3 move up and down as the cylinder 1 moves up and down. The cylinder 1 and the upper electrode holder 2 are referred to as an upper electrode drive mechanism. One part of the cylinder is provided with a human body detection area switch 12. When a person operates the processing machine, the switch is turned on to detect that a person has come to the processing machine or automatically by a sensor (not shown). It is designed to detect that a person has come to the processing machine.

  An upper detector 4 is installed at the lower end of the upper electrode 3, and the upper detector 4 is fixedly supported by an upper detector support fitting 9. As shown in FIG. 3, the upper detector 4 is disposed so as to surround the upper electrode 3, and is formed in a continuous shape so as to flow a current in a loop shape. The upper detector 4 is provided below the lower end of the upper electrode 3, and descends ahead of the upper electrode 3 when the upper electrode 3 descends.

  Below the upper electrode 3, a lower electrode 5 provided at the upper end of the lower electrode 6 and the lower electrode 6, and a lower electrode holder 7 that holds the lower electrode 6 are installed. Although not shown, the lower detector 5 is disposed so as to surround the lower electrode 6 in the same manner as the upper detector 4.

  The processing machine is provided with a current supply unit for supplying a weak current that does not cause an electric shock to the upper detector 4 or the lower detector 5, and supplies a weak current to either the upper detector 4 or the lower detector 5. To do. The processing machine is provided with a current sensor (not shown) for detecting a current flowing through the lower detector 5 or the upper detector 4 disposed opposite to the upper detector 4 or the lower detector 5 to which a weak current is supplied. Yes.

  Here, the upper detector 4 is formed in a cylindrical shape with respect to the columnar upper electrode 3 and is sized so as to ensure a distance from the upper electrode 3, whereby a plate material or a member is formed between the upper electrode 3 and the lower electrode 6. The upper detector 4 can be protected from the heat generated when it is sandwiched and melted and solidified. In addition, the lower detector 5 is formed in a cylindrical shape with respect to the cylindrical lower electrode 6 and is sized so as to ensure a distance from the lower electrode 6, thereby sandwiching a plate material or member between the upper electrode 3 and the lower electrode 6. The lower detector 5 can be protected from heat generation during melting and solidification.

  The upper detector 4 or the lower detector 5 has a weak current that does not cause an electric shock even if a person touches it, and when the person touches the upper detector 4 or the lower detector 5, the human body detects the detector and the plate material, Alternatively, since a gap is formed between the plate member and a member having a thread (hereinafter simply referred to as member 11), a loop current does not flow through the lower detector 5 or the upper detector 4, so that a current flows through the current sensor. Detect missing. The control unit that detects that no current flows to the lower detector 5 or the upper detector 4 with the current sensor is configured to determine that a person has touched.

  On the other hand, when a person is not in contact, the weak current flowing through the upper detector 4 or the lower detector 5 flows between the plate members that are conductors, or a member having a plate member and a thread (hereinafter simply referred to as the member 11). Since the weak current flows through the lower detector 5 or the upper detector 4, the weak current flowing by the current sensor is detected.

  In this way, when it is determined by the control unit that a person has touched, the cylinder 1 is controlled to stop descending and rise by the control signal from the control unit.

  In addition, by making the shape which surrounds the upper electrode 3 with the upper detector 4, in the case of the member 11 which fits in the upper detector 4, a human contact is detectable even if it uses a non-conductive member.

  When pressurizing and joining plate members or a member (hereinafter simply referred to as member 11) 11 having plate members and threads, the cylinder 1 is moved up by a foot switch 10, and the plate members or members having plate members and threads are moved. Are positioned between the upper electrode 3 and the lower electrode 6, and the member 11 is positioned with respect to the upper electrode 3. Next, the cylinder 1 is lowered by the foot switch 10, and the member 11 is sandwiched between the upper electrode 3 and the lower electrode 6 and pressurized.

  When the member 11 is pressurized, a current is passed through the upper electrode 3 and the lower electrode 6, and heat is generated by the resistance of the member 11 to melt and fix the member 11.

  When the human body comes into contact with the upper detector 4, the upper detector 4 descends ahead of the upper electrode 3, so that the human body can be detected before the member 11 is sandwiched and pressurized. Thus, when it is detected by the upper detector 4 that the human body has come into contact, the control unit forcibly stops and raises the lowering operation of the cylinder 1. As a result, pinching can be prevented and the human body can be reliably protected.

  According to the present embodiment, it is possible to prevent the upper detector from being damaged by the heat generated when the member 11 is sandwiched between the upper electrode 3 and the lower electrode 6 and melted and solidified, and the operation is synchronized with the upper electrode that performs the lifting operation. It is possible to detect the human body prior to the electrode tip and move the upper electrode in a safe direction. By forming the upper electrode 3 so as to surround the upper detector 4, the non-conductive member 11 can be used as long as it is a member 11 that can be accommodated in the upper detector 4.

  A second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a front view of a processing machine provided with a pressure shearing mechanism that sandwiches a plate material between an upper mold and a lower mold that move up and down.

  An upper die 22 that moves up and down by an upper die drive mechanism is provided on the upper portion of the main body 16 of the processing machine, and a fixed lower die 23 is provided on the lower portion. When the operator operates the foot switch 24, the upper die 22 moves up and down, and the member 25 sandwiched between the upper die 22 and the lower die 23 is sheared. The main body 16 is provided with a stroke rail 20 for guiding the vertical movement of the upper die 22. The upper die 22 is provided below the teeth of the upper die 22, and the upper die 22 has teeth. An upper detector 21 descending in advance is attached. A lower detector 26 is provided above the lower mold 23. The upper detector 21 and the lower detector 26 are formed longer than the lengths of the upper die 22 and the lower die 23, and can be detected even if the human body touches the tooth range of the upper die 22 and the lower die 23. Yes.

  The main body 16 is provided with a human body detection area switch (not shown). When a person operates the processing machine, the body 16 is turned on to detect that the person has come to the processing machine or is automatically detected by a sensor (not shown). It comes to detect that has come to the processing machine.

  The processing machine is provided with a current supply unit for supplying a weak current that does not cause an electric shock to the upper detector 21 or the lower detector 26, and the weak current is supplied to either the upper detector 21 or the lower detector 26. . The processing machine is provided with a current sensor (not shown) for detecting a current flowing through the lower detector 26 or the upper detector 21 to which a weak current is not supplied.

  A weak current that does not cause an electric shock even when touched by the person flows through the upper detector 21 or the lower detector 26. When the person touches the upper detector 21 or the lower detector 26, the human body detects the detector and the plate material, or Since there is an air gap between the members, no current flows through the lower detector 26 or the upper detector 21, and the current sensor detects that no current flows. The control unit that detects that the current no longer flows to the lower detector 26 or the upper detector 21 with the current sensor is configured to determine that a person has touched.

  On the other hand, when a person is not in contact, the weak current flowing through the upper detector 21 or the lower detector 26 flows through a plate material that is a conductor, or a member having a plate material and a screw thread, and the lower detector 26 or the upper detector. Since a weak current flows through the device 21, the weak current flowing through the current sensor is detected.

  In this way, when it is determined by the control unit that a person has come into contact, the upper mold 22 is controlled to stop descending and rise by the control signal from the control unit.

As described above, when a member having a plate material or a screw thread is sandwiched by the lifting operation of the upper mold 22 and shearing is performed, the member 25 is positioned with respect to the upper mold 22, and the upper mold 22 is moved up and down. Since the upper detector 21 is lowered in advance, the human body can be detected before the shearing process is performed, and the human body can be reliably protected.

It is a perspective view of the processing machine which is one Example of this invention. It is a side view which expands and shows a pinching pressurization mechanism part. It is a cross-sectional view of the sandwiching and pressing mechanism. It is a front view which expands and shows the pinching pressure shearing mechanism part used for the shearing of a steel plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cylinder, 2 ... Upper electrode holder, 3 ... Upper electrode, 4,21 ... Upper detector, 5,26 ... Lower detector, 6 ... Lower electrode, 7 ... Lower electrode holder, 8, 20 ... Stroke rail, 9 ... upper detector support brackets, 10, 24 ... foot switch, 11 ... member, 12 ... human body detection area switch, 22 ... upper mold, 23 ... lower mold, 25 ... member.

Claims (4)

And an upper mold which operates raising descending placed on top of the body descends ahead the upper die, an upper detector provided apart the upper mold and the distance, the lower mold installed on the lower portion of the main body , away lower die and the distance is provided at an upper part of the lower mold, and the lower detector opposes the upper detector, and the upper detector or the current supply section for supplying a current to the lower detector, wherein in the lower detector, a current sensor detecting a current flowing from the upper detector, based on the amount of current detected by said current sensor, further comprising a controller arranged to control the upward movement of the upper die machine provided with the anti-safety device interposed characterized. And an upper mold which operates raising descending placed on top of the body descends ahead the upper die, an upper detector provided apart the upper mold and the distance, the lower mold installed on the lower portion of the main body , away lower die and the distance is provided at an upper part of the lower mold, and the lower detector opposes the upper detector, and the upper detector or the current supply section for supplying a current to the lower detector, wherein in the upper detector, a current sensor detecting a current flowing from the lower detector, based on the amount of current detected by said current sensor, further comprising a controller arranged to control the upward movement of the upper die machine provided with the anti-safety device interposed characterized. 3. The sandwiched structure according to claim 1, wherein the upper detector is disposed so as to surround the upper mold, and the lower detector is disposed so as to surround the lower mold, and is formed in a cylindrical shape. A processing machine equipped with a safety device. The processing machine provided with the anti-pinch safety device according to any one of claims 1 to 3, wherein the upper mold and the lower mold include electrodes.

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