JP5038247B2 - Sluice hydraulic drive system and sluice - Google Patents

Description

  The present invention relates to a hydraulic drive system for a sluice and a sluice.

  As this type of technology, a hydraulic cylinder system and a sluice described in Patent Document 1 are known. The hydraulic cylinder system includes a hydraulic cylinder movable in two directions, a hydraulic pump capable of discharging hydraulic oil in two directions, a closed hydraulic circuit connecting the hydraulic cylinder and the hydraulic pump, and rotating the hydraulic pump. It has a servo motor that is an electric motor to be driven, a servo amplifier that drives the servo motor, and a controller that controls the servo amplifier. The sluice gate is provided with a door body that is disposed substantially at right angles to the water channel and can be moved up and down in a substantially vertical direction, and the door body is moved up and down by the hydraulic cylinder.

JP 2004-96867 A

  By the way, in the hydraulic cylinder system, when the door body is closed, the door body is lowered by its own weight. Therefore, in the case of the hydraulic circuit, it is operated without increasing the pressure only by sending hydraulic oil (no-load operation). Because the pressure on the piping (pump discharge side line) that sends hydraulic fluid hardly increases, piping damage (such as cracks in the piping or leakage from the connection) can be detected by pressure drop. Have difficulty.

  In the hydraulic cylinder system, the rotation direction, rotation speed, and rotation torque of the servo motor are electrically controlled by the movement control servo amplifier and system controller, so the hydraulic pump is controlled by the servo motor. Is done. For this reason, when the pressure and flow rate are controlled, a load is applied to the servo motor, and the servo motor tends to generate heat. In addition, a cooling device is required, and the equipment is enlarged.

  In both cases of raising and lowering the door body, a downward load is applied to the hydraulic cylinder. Therefore, when closing the door body, the servo motor rotates while applying a brake to the downward load. The motor acts as a generator to generate a regenerative current, and this regenerative current causes heat generation in the resistance portion in the servo motor and servo amplifier, causing burnout and deterioration.

  The present invention has been made in consideration of the above circumstances, and a hydraulic drive system for a sluice that can easily detect an abnormality in pressure drop due to damage to a pipe on the side that feeds hydraulic oil when closing the door body, and the like The purpose is to provide a sluice.

In order to achieve the above object, a hydraulic drive system for a sluice according to the present invention includes a sluice door provided in a waterway so as to be movable up and down or pivotable about a horizontal axis , and the door. A hydraulic motor rotatable in two directions for opening and closing, a variable displacement piston pump capable of discharging hydraulic oil in two directions and controlling a discharge amount, and a closing connecting the hydraulic motor and the variable displacement piston pump A hydraulic circuit, an electric motor that drives a driven shaft of the variable displacement piston pump at a constant rotation, a control device that controls a discharge direction and a discharge amount of the variable displacement piston pump , and a predetermined amount in the hydraulic circuit. pressure and charge pressure auxiliary pump for enabling sensing the pressure drop caused by the piping damages and the like in the hydraulic circuit with keeping the charge pressure of the predetermined charge pressure of the hydraulic circuit as a reference And a pressure switch for detecting the lower abnormality, the variable displacement piston pump to the hydraulic circuit is characterized in that it is connected in parallel at least two groups.

  It is preferable that the charge pressure auxiliary pump is driven by the electric motor together with the variable displacement piston pump.

The sluice according to the present invention is characterized in that the door body is moved up and down or rotated by a hydraulic motor of a hydraulic drive system according to claim 1.

According to the present invention , not only can a pressure drop abnormality due to piping damage or the like on the side of sending hydraulic oil at the time of closing the door body be detected easily , but a variable displacement piston pump driven by an electric motor is at least Since two units are connected in parallel, backup is possible when one of the power sources fails and a high-speed mode in an emergency is possible .

  The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a schematic front view showing a sluice according to an embodiment of the present invention, FIG. 2 is a schematic plan view of FIG. 1, and FIG.

  In these drawings, reference numeral 1 denotes a rising sector gate exemplified as a sluice, and includes a door 3 provided in a water channel 2 so as to be rotatable about a horizontal axis so as to open and close the gate. The door body 3 has a shell structure cross section (closed cross section), and discs 5 that rotate around the central axis 4 are provided at both ends thereof. The discs 5 at both ends of the door body 3 are rotatably supported by center shafts 4 fixed to peers (quay walls, gate pillars, etc.) 6 on both sides of the water channel 2. One peer 6 is provided with a hydraulic drive system 7 as a hydraulic opening / closing device for opening and closing the door body 3.

  A pin rack 8 is provided along the circumferential direction on the disk 5 of the door 3 on the hydraulic drive system 7 side, and a pinion 10 attached to a hydraulic motor 9 constituting the hydraulic drive system 7 is meshed with the pin rack 8. ing. In order to open and close the door body 3, a plurality of hydraulic motors 9, for example, 1 to 4 (three in the illustrated example) are used. An operation chamber 11 is installed in the peer 6, and a hydraulic drive system 7 is installed in the operation chamber 11.

  FIG. 4 is a block diagram showing an embodiment of the hydraulic drive system of the sluice. The hydraulic drive system 7 includes a hydraulic motor 9 rotatable in two directions for rotating (opening and closing) the door body 3, and a variable displacement type capable of discharging hydraulic oil in two directions and controlling the discharge amount. A piston pump 12, a closed hydraulic circuit 13 for connecting the hydraulic motor 9 and the variable displacement piston pump 12, an electric motor 15 for driving a driven shaft 14 of the variable displacement piston pump 12 at a constant rotation, And a control device 16 for controlling the discharge direction and the discharge amount of the variable displacement piston pump 12. The electric motor 15 is configured such that its output shaft 15a rotates at a constant rotation (rotation direction and number of rotations) to drive the driven shaft 14 of the variable displacement piston pump 12.

  Since the existing variable displacement piston pump (hereinafter also simply referred to as a piston pump) 12 is used, the description of the specific structure is omitted. The piston pump 12 has two ports. By operating a swash plate (thrust plate) 17 that is an operated portion by an operating portion 18, the discharge direction can be switched and the discharge amount can be increased or decreased. . One port of the hydraulic motor 9 and one port of the piston pump 12 are connected by one pipe (A line) 13a, and the other port of the hydraulic motor 9 and the other port of the piston pump 12 are connected by the other pipe (B line). ) 13b. Incidentally, when the door body 3 is closed, the A line 13a is the discharge side and the B line 13b is the return side. Conversely, when the door body 3 is opened, the B line 13b is the discharge side and the A line 13a is the return side. It becomes.

  In the illustrated example, one hydraulic motor 9 is shown, and the remaining hydraulic motors are not shown. Specifically, a plurality of (for example, three) hydraulic pressures are provided between the A line 13a and the B line 13b. A motor 9 is connected in parallel (not shown). Each hydraulic motor 9 is provided with a disc brake (braking device) 19 for fixing the door 3 at a desired opening position. The disc brake 19 stops the rotation by braking the hydraulic motor 9 with the biasing force of the built-in spring, releases the braking by applying the hydraulic pressure against the biasing force of the spring, and rotates the hydraulic motor 9. It comes to allow.

  In the case of the hydraulic circuit 13, when the door body 3 is closed (no load operation), the hydraulic oil is operated without increasing the pressure only by sending the hydraulic oil clockwise in FIG. Since the pressure of the A line 13a hardly rises, it is difficult to detect piping damage or the like with a pressure drop. Therefore, in order to solve this problem, a charge pressure auxiliary pump 20 is provided to maintain the inside of the hydraulic circuit 13 (A line and B line) at a predetermined charge pressure (at least 2.5 MPa or more), and the hydraulic pressure is increased. The circuit 13 is provided with a pressure switch (pressure drop abnormality sensor) 21 for detecting (detecting) a pressure drop abnormality with a predetermined pressure (for example, 1.5 MPa) as a reference.

  The pressure switch 21 can detect that the pressure in the hydraulic circuit 13 has been established by turning ON when the pressure in the hydraulic circuit 13 is equal to or higher than a predetermined pressure (for example, 1.5 MPa), and the pressure in the hydraulic circuit 13 is predetermined. When the pressure is lower than a pressure (for example, 1.5 MPa) or less than a predetermined pressure, the pressure is turned off when the pipe is damaged. The driven shaft 20a of the charge pressure auxiliary pump 20 is preferably connected to the driven shaft 14 of the piston pump 12, and is driven together with the piston pump 12 by the electric motor 15, whereby the structure and control are controlled. Is simplified.

  In the hydraulic circuit 13, the A line 13a and the B line 13b on the hydraulic motor 9 side are provided with pilot check valves 22a and 22b for opening and closing the door body, respectively, and the hydraulic motor 9 side than the pilot check valves 22a and 22b. The A line 13a and the B line 13b are provided with a high pressure abnormality detection pressure switch (high pressure abnormality sensor) 23 which is turned on at, for example, 25 MPa or more. A stop valve 25 is provided in the bypass line 24 interposed between the A line 13a and the B line 13b. Between the A line 13a and the B line 13b closer to the piston pump 12 than the pilot check valves 22a and 22b, for example, excess hydraulic oil of 2.5 MPa or more is discharged to the oil storage tank 27 via the discharge line 26. A discharge valve mechanism 28 is connected, and a line filter 29 is provided on the discharge line 26.

  The charge pressure includes other pressure sources, for example, a pressure source for the operation unit 18 of the piston pump 12, a pressure source for switching the operation of the pilot check valves 22a and 22b, and a pressure for releasing the disc brake 19. Used as a source. The suction port of the charge pressure auxiliary pump 20 is connected to the oil storage tank 27 via a suction pipe 30 and a suction filter 31, and the discharge port of the charge pressure auxiliary pump 20 is divided into three branch pipes 33, 34 via a discharge pipe 32. , 35 are connected.

First, the first branch pipe 33 is connected to a circulation compensation line 36 that connects the A line 13 a and the B line 13 b in the vicinity of the piston pump 12. The circulation compensation line 36 is provided with a pair of check valves 37 and a pair of relief valves 38. The first branch pipe 33 is provided with a line 39 for supplying hydraulic oil to the operation unit 18 and a relief valve 40 for discharging hydraulic oil having a predetermined pressure to the oil storage tank 27. Incidentally, 41 denotes a diaphragm provided on the line 39, 42 is a shuttle valve provided between A line 13a and the B line 13b, 43 is a relief valve which is actuated by the hydraulic fluid from the shuttle valve 42.

  The second branch pipe 34 is connected via a switching line 44 to an electromagnetic switching valve 45 for switching operation / non-operation of the pilot check valves 22a, 22b. When the pilot check valves 22a and 22b are in an operating state, the hydraulic oil cannot be circulated to the hydraulic motor 9. In this case, the hydraulic oil from the pinton pump 12 circulates through the circulation compensation line 36. When the pilot check valves 22a and 22b are not in operation, the hydraulic oil can be circulated through the hydraulic motor 9.

  The third branch pipe 35 is connected to an electromagnetic switching valve 47 for operating the disc brake 19 via a brake operation line 46. The brake operation line 46 is provided with a brake release pressure confirmation switch 48 that is turned on at, for example, 5 MPa or more.

  The hydraulic oil released from the switching line 44 and the brake operation line 46 is discharged to the oil storage tank 27 via the discharge line 49. The piston pump 12 is connected to a drain line 50 for discharging leaked oil into the oil storage tank 27, and this drain line 50 is connected upstream of the line filter 29 in the discharge line 26. The hydraulic motor 9 is connected to a drain line 52 for discharging leaked oil into the oil storage tank 27 via the check valve 51. In this way, the hydraulic oil (relatively high temperature) discharged from the various places of the hydraulic circuit 13 to the oil storage tank 27 is mixed with the normal temperature hydraulic oil in the oil storage tank 27, cooled, and filtered by the suction filter 31. Since the charge pressure auxiliary pump 20 supplies the hydraulic circuit 13 again in a fresh state, it is possible to suppress or prevent the temperature rise in the closed hydraulic circuit 13 and the progress of contamination of the hydraulic oil.

  According to the hydraulic drive system 7 or the sluice 1 which is the hydraulic switchgear of the sluice 1 having the above configuration, since the hydraulic circuit 13 is a closed circuit, the circuit can be simplified and the hydraulic oil is sent in both directions. The door 3 can be opened and closed smoothly. In particular, since the variable displacement piston pump 12 is used as the hydraulic pump, the discharge direction and the discharge amount can be easily controlled only by the control on the piston pump 12 side while the electric motor 15 is kept at a constant rotation. For this reason, there is no problem of heat generation of the electric motor 15 due to the regenerative resistance, which is a problem when using the servo motor. In addition, since the number of circuit components is reduced, it is possible to suppress the heat generation of hydraulic oil due to resistance.

  In addition, since the discharge direction and the discharge amount can be controlled quickly and easily only by the control on the piston pump 12 side, the speed change at the time of opening and closing the door body can be performed quickly and easily. It is possible to mitigate impact at the time of closing and to suppress self-running at the time of closing operation. In addition, high-speed operation during maintenance is possible, and the maintenance work period can be shortened.

  Furthermore, since the hydraulic pressure circuit 13 is always maintained at the charge pressure or higher by providing the charge pressure auxiliary pump 20, the A line 13 a on the side of sending hydraulic oil is negative pressure even when the door body is closed. Is maintained at the charge pressure. For this reason, if the pressure switch 21 is set at a predetermined pressure lower than 2.5 MPa, for example, less than 1.5 MPa, an abnormal pressure drop due to pipe damage or the like can be easily detected.

  FIG. 5 is a block diagram showing another embodiment of the hydraulic drive system for the sluice. In this embodiment, the same parts as those of the embodiment of FIG. At least two variable displacement piston pumps 12 driven by the electric motor 15 are connected in parallel to the hydraulic circuit 13 of the present embodiment. In addition, the code | symbol 53 in FIG. 5 is a shuttle valve which connects the brake operation line 46 and the two electromagnetic switching valves 47 and 47. FIG. According to the sluice hydraulic drive system 7 of this embodiment or the sluice equipped with this hydraulic drive system 7, the same effect as that of the embodiment of FIG. Since at least two piston pumps 12 are connected in parallel, not only backup when one power source fails but also a high-speed mode in an emergency is possible.

  The embodiments of the present invention have been described in detail with reference to the drawings. However, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the gist of the present invention. . For example, the pressure switch 21 is turned on when the pressure in the hydraulic circuit 13 exceeds a predetermined pressure, and can detect that the hydraulic pressure in the hydraulic circuit 13 is established, and the pressure in the hydraulic circuit 13 is less than the predetermined pressure. It may be turned OFF to detect a pressure drop abnormality due to pipe damage or the like, or detection of establishment of hydraulic pressure and detection of pressure abnormality may be performed by each pressure switch.

It is a schematic front view which shows the sluice which is embodiment of this invention. FIG. 2 is a schematic plan view of FIG. 1. It is an AA line expanded sectional view of FIG. It is a block diagram which shows embodiment of the hydraulic drive system of a sluice. It is a block diagram which shows other embodiment of the hydraulic drive system of a sluice.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water gate 2 Water channel 3 Door body 9 Hydraulic motor 12 Variable displacement type piston pump 13 Hydraulic circuit 14 Driven shaft 15 Electric motor 16 Controller 20 Charge pressure auxiliary pump 21 Pressure switch

Claims (3)

A sluice door provided in the water channel so that it can be raised and lowered or pivoted about a horizontal axis, a hydraulic motor rotatable in two directions for opening and closing the door, and hydraulic oil in two directions A variable displacement piston pump capable of discharging the discharge and controlling the discharge amount, a closed hydraulic circuit connecting the hydraulic motor and the variable displacement piston pump, and a driven shaft of the variable displacement piston pump with constant rotation Motor, a control device for controlling the discharge direction and discharge amount of the variable displacement piston pump, and maintaining a predetermined charge pressure in the hydraulic circuit, and detecting a pressure drop due to piping damage in the hydraulic circuit a charge pressure auxiliary pump that allows, and a pressure switch for detecting a pressure drop abnormality a predetermined charge pressure of the hydraulic circuit as a reference, the variable capacity type in the hydraulic circuit Hydraulic drive system floodgates which piston pump is characterized in that it is connected in parallel at least two groups.   The hydraulic drive system for a sluice according to claim 1, wherein the charge pressure auxiliary pump is driven by the electric motor together with the variable displacement piston pump. Sluice, characterized in that before Kitobiratai is lifting or rotated by a hydraulic motor of the hydraulic drive system of claim 1, wherein.

Images