JP5197520B2 - Wire slack detection device - Google Patents

Description

  The present invention relates to a wire slack detection device used in a wire hoisting machine for a hoisting gate provided with a door body that can be hoisted on a bottom surface of a water channel via a support member.

  Various types of wire slack detection devices used in the wire hoisting machine for undulation gates have been proposed in the past. Examples of those relating to the present invention include those shown in FIGS. 4 and 5. As shown in FIG. 4, the hoisting gate 40 includes a door body 43 that is pivotally supported on the bottom surface of the water channel 41 via a support member 42, and water intake established on the water channel side wall 41 a on the upstream side of the door body 43. A float chamber 45 that communicates with the mouth 44, a float 46 that moves up and down with a change in the water level in the float chamber 45, and a wire that holds the door body 43 in an inclined state or stands the fallen door body 43 47 and a wire hoisting machine 48 provided with a hoisting drum 49 for winding and unwinding the wire 47, and a wire slack detecting device 50 is attached to the wire hoisting machine 48.

  As shown in FIG. 5, the wire slack detection device 50 includes a sensor lever 53 rotatably supported on a support shaft 56 of a bracket 52 provided on a gantry 51 of a wire hoist 48, and one end of the sensor lever 53. The guide roller 54 rotatably supported by the portion 53a, and the other end portion 53b of the sensor lever 53 and the bracket 52 are stretched to press and contact the outer periphery of the wire 47 in a tension state. A spring 55 and a sensor 57 that operates when the sensor lever 53 rotates a predetermined angle counterclockwise about the support shaft 56 are provided.

  The operation panel (not shown) of the wire hoisting machine 48 is provided with a hoisting button and a lowering button (both not shown) for starting the hoisting drum 49 manually. In the vicinity of the upper machine 48, when the winding of the wire 47 reaches the upper limit and when the lowering of the wire 47 reaches the lower limit, an upper and lower limit limiting device (not shown) that automatically stops the rotation of the winding drum 49 Is provided. When the winding button (not shown) is pressed, the winding drum 49 rotates to wind the wire 47, and when the winding of the wire 47 reaches the upper limit, the winding drum 49 automatically stops. . When the lowering button (not shown) is pressed, the hoisting drum 49 rotates in reverse and the wire 47 is fed out. When the lowering of the wire 47 reaches the lower limit, the hoisting drum 49 is automatically turned on. Stop.

  As shown in FIGS. 4 and 5, the door 47 in a normal state is maintained at a predetermined inclination angle by the wire 47, and the wire 47 in a tension state at this time maintains a straight state, so that the elastic force of the spring 55 is maintained. The guide roller 54 that is in pressure contact with the outer periphery of the wire 47 is also held at a predetermined position.

  On the other hand, when the lowering button (not shown) is pressed, the hoisting drum 49 is activated to lower the wire 47 and the door 47 is lying down. If there is an obstacle such as a stone or earth and sand below the door 12 to prevent the door body 12 from falling down, as shown in FIG. 5, the wire 47 fed out from the hoisting drum 49 is loosened to a state like a wire 47a. When the wire 47 is in the state of the wire 47 a, the guide roller 54 that is in press contact with the outer periphery of the wire 47 rotates counterclockwise around the support shaft 56 by the biasing force of the spring 55, and the other end of the sensor lever 53. 53b comes into contact with the operating portion 57a of the sensor 57, the sensor 57 is activated, and the lowering operation of the hoisting drum 49 is automatically stopped.

  As described above, when the lowering button 43 (not shown) is pressed and the door 43 during the lying down operation is stopped by an obstacle such as a stone or earth and the wire 47a is loosened, this is detected. Since the apparatus 50 detects and stops the rotation of the hoisting drum 49 and prevents the wire 47 from being further fed, the trouble that the wire 47 comes off from the hoisting drum 49 and the subsequent operation becomes impossible is prevented. Can do.

  On the other hand, although it is a field different from the technical field to which the present invention belongs, Patent Documents 1 and 2 disclose a technique for detecting a slack in a wire kept in a tension state and generating a predetermined signal. It is disclosed.

JP-A-8-310790 JP 2000-143391 A

  In the case of the wire slack detection device 50 shown in FIGS. 4 and 5, in order to accurately perform the detection operation of the sensor lever 53, the winding is performed so that the position of the guide roller 54 that presses and contacts the outer periphery of the wire 47 does not change. It is necessary to keep the approach angle with respect to the drum 49 constant. Therefore, in the undulating gate 40 shown in FIG. 4, a rotatable guide pulley 55 is provided below the hoisting drum 49 and the sensor lever 53, and the wire 47 connected to the door body 43 is routed through the guide pulley 55. By winding the wire 47 around the winding drum 47, the angle of entry of the wire 47 with respect to the winding drum 49 is kept constant.

  Accordingly, the positional relationship and distance between the door body 43 and the wire hoisting machine 48 change depending on the situation of the construction site, and whenever the approach angle of the wire 47 with respect to the hoisting drum 49 changes around the drum axis 49a, the wire In order to set the guide roller 54 in pressure contact with the outer periphery of the 47 at a predetermined position, it is necessary to locate the position where the wire 47 entry angle with respect to the hoisting drum 49 can be kept constant, and to install the guide pulley 55. It is one of the factors that inhibit

  On the other hand, the wire slack detection technologies described in Patent Documents 1 and 2 exhibit excellent functions in their respective technical fields, but are extremely difficult to use for wire hoisting machines for undulating gates. Also, it is impossible to cope with a change in the wire entry angle with respect to the hoisting drum of the wire hoisting machine.

  The problem to be solved by the present invention is to provide a wire slack detection device that can accurately detect the slack of the wire and can easily and accurately respond to a change in the wire entry angle with respect to the wire take-up drum. There is.

The wire slack detection device of the present invention is a wire slack detection device used in a wire hoisting machine having a winding drum that winds up a wire connected to a door body of an undulating gate so that the wire can be unwound.
A support shaft rotatably provided coaxially with the axis of the take-up drum, a sensor arm extending in the radial direction of the take-up drum from the support shaft so as to come into contact with the wire outer periphery in a tension state; Sensor lever, biasing means for applying a rotational force around the axis to the sensor lever to keep the sensor arm in contact with the outer periphery of the wire, and detecting that the sensor lever has rotated in the direction of the rotational force A slack sensor, and a fixed position of at least one of the sensor arm or the sensor lever with respect to the support shaft can be changed around the support shaft.

  With such a configuration, after the operation of the lowering button or the like, when the door body performing the inclining operation is stopped by an obstacle and the wire is slackened, the wire is held in a predetermined posture by pressing and contacting the outer periphery of the wire. The holding force of the sensor arm that has been lost is lost, and the sensor arm rotates in the direction of the rotational force that the sensor lever receives from the urging means. Therefore, the looseness of the wire is detected by detecting the rotation of the sensor lever by the slack sensor. Can be detected accurately.

  In addition, since the fixed position of at least one of the sensor arm or the sensor lever with respect to the support shaft can be changed around the support shaft, when the wire entry angle with respect to the hoisting drum of the wire hoisting machine changes, By simply changing the fixed position of the sensor arm or sensor lever with respect to the shaft around the support shaft, the sensor arm contacting the outer circumference of the wire in tension can be set at the correct position. For this reason, it can respond to the change of the approach angle of the wire with respect to a wire winding drum easily and exactly.

  Here, if an electric switch operated by the sensor lever rotated in the direction of the rotational force is provided as the slack sensor, the rotation of the sensor lever is immediately detected by the electric switch, so that the slack of the wire is reliably detected. can do.

  According to the present invention, it is possible to provide a wire slack detection device capable of accurately detecting slack of a wire and easily and accurately responding to a change in the wire entry angle with respect to the wire take-up drum.

It is a vertical sectional view showing the undulation gate using the wire slack detection device which is an embodiment of the present invention. It is a side view of the wire slack detection apparatus shown in FIG. FIG. 3 is a partially omitted cross-sectional view taken along line AA in FIG. 2. It is a vertical sectional view showing a conventional undulation gate. FIG. 5 is a partially omitted side view of the wire winding machine for the undulating gate shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the wire slack detection device 10 of this embodiment includes a winding drum 14 that winds up a wire 13 connected to a door body 12 of an undulating gate 11 installed in a water channel 16 so that the wire 13 can be unwound. Used in the hoisting machine 15.

  The hoisting gate 11 is a float chamber that communicates with a door body 12 that is pivotally supported on the bottom surface of the water channel 16 via a support member 17 and a water intake port 18 a that is opened on the water channel side wall 16 a upstream of the door body 12. 18, a float 19 that moves up and down with a change in the water level in the float chamber 18, a wire 13 that is stretched to hold the door body 12 in an inclined state or to stand the fallen door body 12, A wire hoisting machine 15 having a hoisting drum 14 that winds or unwinds the wire 13, and the wire slack detection device 10 is attached to the wire hoisting machine 15.

  The operation panel (not shown) of the wire hoisting machine 15 is provided with a hoisting button and a lowering button (both not shown) for starting the hoisting drum 14 by manual operation. In the vicinity of the upper machine 15, when the winding of the wire 13 reaches the upper limit and when the lowering of the wire 13 reaches the lower limit, an upper / lower limit limiting device that automatically stops the rotation of the winding drum 14 ( (Not shown) is provided.

  When the winding button (not shown) is pressed, the winding drum 14 rotates and the wire 13 is wound, and when the winding of the wire 13 reaches the upper limit, the winding drum 13 automatically stops. . Further, when the lowering button (not shown) is pressed, the hoisting drum 14 rotates in the opposite direction to the wire 13 and the wire 13 is fed out. When the lowering of the wire 13 reaches the lower limit, the hoisting is performed. The drum 14 automatically stops.

  As shown in FIGS. 2 and 3, the wire slack detection device 10 includes a support shaft 20 provided coaxially with an axis 14 a of a rotation shaft 14 b of a winding drum 14, and a wire 13 in a tension state. A sensor arm 21 extending from the support shaft 20 in the radial direction of the take-up drum 14 to make contact with the outer periphery, and a rotation of the sensor lever 23 around the axis 14a to keep the sensor arm 21 in contact with the outer periphery of the wire 13 A spring 22 as an urging means for applying a force F, a sensor lever 23 extending from the support shaft 20 in the radial direction of the take-up drum 14, and detecting that the sensor lever 23 has rotated in the direction of the rotational force F. And a slack sensor 24. The spring 22 applies a rotational force F in the wire feeding direction around the axis 14 a to the support shaft 20 and the sensor arm 21 via the sensor lever 23.

  The sensor arm 21 and the sensor lever 23 are disposed on the outer surface side of the flange 14 c of the winding drum 14, and the base end portions 21 b and 23 b are overlapped and fixed to the support shaft 20 with bolts 25 so as to be detachable. The bolt 25 passes through the base end portions 21b and 23b and is screwed from the end surface of the support shaft 20 toward the axis 14a. Therefore, if the bolts 25 are loosened, the fixing positions of the sensor arm 21 and the sensor lever 23 with respect to the support shaft 20 can be changed around the support shaft 20, respectively. The spring 22 is stretched between the tip end portion 23 a of the sensor lever 23 and the mount 15 a of the wire hoisting machine 15.

  A guide shaft 26 parallel to the axis 14a of the take-up drum 14 is projected from the tip 21a of the sensor arm 21 so as to be positioned around the drum body 14d. A circular guide is provided on the outer periphery of the guide shaft 26. A tube 27 is rotatably attached. An operating portion 23c bent in an L shape in the same direction as the guide shaft 26 of the sensor arm 21 (parallel to the shaft center 14a) is formed at the distal end portion 23a of the sensor lever 23.

  When setting the wire slack detection device 10, the bolt 25 is loosened to position the sensor arm 21 and the sensor lever 23 that are rotatable about the shaft center 14a with respect to the support shaft 20. The sensor arm 21 is positioned in such a posture that the guide tube 27 of the guide shaft 26 at the distal end portion 21a is in contact with the outer periphery of the wire 13 in a tension state between the inclined door body 12 and the winding drum 14. . The sensor lever 23 is positioned in such a posture that the operating portion 23c of the distal end portion 23a is separated from the detecting portion 24a of the slack sensor 24 by a predetermined distance. Thereafter, when the bolt 25 is tightened and the sensor arm 21 and the sensor lever 23 are fixed to the support shaft 20, the sensor arm 21 and the sensor lever 23 are integrated with the support shaft 20 in an inverted V shape.

  As a result, the sensor arm 21 and the sensor lever 23 are pivotally supported by the rotary shaft 14b of the hoisting drum 14 around the support shaft 20 while maintaining an inverted V shape. As shown, since the spring 22 constantly applies a rotational force F around the shaft center 14a to the sensor lever 23, the outer periphery of the guide tube 27 of the guide shaft 26 of the sensor arm 21 presses and contacts the outer periphery of the wire 13. To be kept. Therefore, as shown in FIG. 1, when the approach angle of the wire 13 with respect to the winding drum 14 changes due to the change in the inclination angle of the door body 12, the sensor arm 21 rotates with the support shaft 20, and the outer periphery of the guide tube 27 is The outer periphery of the wire 13 is kept pressed.

  When the sensor arm 21 is rotated due to a change in the angle of entry of the wire 13 with respect to the winding drum 14 due to a change in the inclination angle of the door 12 during normal winding / unwinding operation, the sensor lever 23 is also rotated integrally. The operating portion 23c of the sensor lever 23 approaches and separates from the detecting portion 24a of the slack sensor 24. The distance between the operating portion 23c and the detecting portion 24a is set in advance assuming the distance of the approaching and separating during normal operation. Therefore, the slack sensor 24 does not operate during normal operation.

  As shown in FIG. 1, when the above-described lowering button (not shown) is pressed in the undulating gate 11 in which the door body 12 is held in an inclined state by the wire 13, the hoisting drum 14 is activated to activate the wire 13. The door body 47 gradually descends toward the bottom surface of the water channel 16 with the hindrance member 17 as the center. Thus, when obstacles, such as a stone and earth and sand, exist in the downward direction of the door body 12 during the fall operation and the fall of the door body 12 is prevented, the wire 13 fed out from the hoisting drum 14 is slackened.

  When the wire 13 is slack, the tension of the wire 13 is lost. Therefore, the guide tube 27 pressed against the outer periphery of the wire 13 is moved in the slack direction of the wire 13 by the biasing force of the spring 22. Accordingly, the sensor lever 23 rotates in the direction of the rotational force F received from the spring 22. When the sensor lever 23 rotates in the above-described direction, the operating portion 23c of the sensor lever 23 comes into contact with the detecting portion 24a of the slack sensor 24, and pressing this causes the slack sensor 24 to operate and generate a detection signal. 13 slacks can be detected accurately. The slack sensor 24 is a contact-type electric switch that operates when the operation portion 23c of the sensor lever 23 contacts the detection portion 24a, but a non-contact type electric switch can also be used.

  In this embodiment, when the slack sensor 24 issues a detection signal, the hoisting drum 14 stops, the feeding of the wire 13 stops, and an alarm sound is emitted, so that a quick response is possible. Therefore, even after the falling of the door body 12 stops, the feeding of the wire 13 from the hoisting drum 14 does not stop, and the wire 13 is detached from the hoisting drum 14 to prevent a trouble that makes the subsequent operation impossible. can do.

  On the other hand, as shown in FIG. 2, when the approach angle of the wire 12 with respect to the hoisting drum 14 of the wire hoisting machine 15 is changed as in the case of the wire 13x as shown in FIG. By simply changing the fixed position of the guide shaft 20 around the support shaft 20 and setting it to the position of the sensor arm 21x, the correct position (position where the guide tube 27 of the guide shaft 26 presses and contacts the tensioned wire 13x outer periphery) is set. Can do.

  That is, when the approach angle of the wire 12 with respect to the hoisting drum 14 of the wire hoisting machine 15 is changed, the fixing position of the sensor arm 21 with respect to the support shaft 20 is changed around the support shaft 20, and the sensor lever 23 and the sensor arm 21 are changed. The sensor arm 21 can be set to a correct position (a position where the guide tube 27 of the guide shaft 26 is in press contact with the outer periphery of the tensioned wire 13). For this reason, the wire slack detection device 10 can easily and accurately cope with a change in the approach angle of the wire 13 with respect to the winding drum 14.

  In addition, the wire slack detection device 10 of the present embodiment is a so-called automatic machine that includes a float chamber 18 and a float 19 in addition to the door body 12 that can be raised and lowered via a support member 17 on the bottom surface of the water channel 16. Although it is used for the wire hoist 15 of the undulation type undulation gate 11, the wire slack detection device of the present invention is not limited to this, and can be widely used in other undulation gates.

  INDUSTRIAL APPLICABILITY The wire slack detection device of the present invention can be widely used in a wire hoisting machine for hoisting gates provided with a door body that can be hoisted on a bottom surface of a water channel via a support member.

DESCRIPTION OF SYMBOLS 10 Wire slack detection apparatus 11 Relief gate 12 Door body 13 Wire 14 Winding drum 14a Shaft center 14b Rotating shaft 14c Flange 14d Drum main body 15 Wire hoisting machine 15a Mount 16 Water channel 16a Water channel side wall 17 Bearing member 18 Float chamber 18a Water inlet 19 Float 20 Support shaft 21 Sensor arm 21a, 23a Tip portion 21b, 23b Base end portion 22 Spring 23 Sensor lever 23c Operating portion 24 Looseness sensor 24a Detection portion 25 Bolt 26 Guide shaft 27 Guide tube F Rotational force

Claims (2)

A wire slack detection device used in a wire hoisting machine having a winding drum that winds up a wire connected to a door body of an undulating gate so that the wire can be unwound.
A support shaft that is rotatably provided coaxially with the axis of the take-up drum; and a sensor arm that extends from the support shaft in the radial direction of the take-up drum so as to be in contact with the tensioned wire outer periphery. A sensor lever extending from the support shaft in the radial direction of the winding drum, and a biasing means for applying a rotational force around the axis to the sensor lever in order to keep the sensor arm in contact with the outer periphery of the wire And a slack sensor that detects that the sensor lever has rotated in the direction of the rotational force, and a fixed position of at least one of the sensor arm or the sensor lever with respect to the support shaft can be changed around the support shaft. A wire slack detection device, characterized in that   The wire slack detection device according to claim 1, wherein an electric switch operated by the sensor lever rotated in the direction of the rotational force is provided as the slack sensor.

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