Rail brake device for cargo handling machine, and cargo handling machine

Abstract

To provide a rail brake device for a cargo handling machine which enables reduction of a construction period and a design period.SOLUTION: A rail brake device 50 installed at a cargo handling machine 1 including travel devices 30 each of which may drive along a rail 200 installed on the ground, includes: a rail brake body 60 which presses a brake pad 62, which reciprocates in a vertical direction following motion of a fluid pressure cylinder 61, to an upper surface 201 of the rail to put a brake on the cargo handling machine; a fluid pressure circuit 80 for causing the fluid pressure cylinder to operate; an acceleration sensor 70 which outputs an acceleration signal generated according to an acceleration speed of the cargo handling machine; and a control unit 51 which outputs a control signal based on the acceleration signal from the acceleration sensor. The fluid pressure circuit includes a valve mechanism 81 which is controlled by the control signal to adjust an amount of a working fluid in pressure chambers of the fluid pressure cylinder. The acceleration sensor is installed to detect an acceleration speed in at least a travel direction of the cargo handling machine.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a rail braking device for cargo handling machines such as container cranes and unloaders, and a cargo handling machine.

Background Art

[0002] Cargo handling machines such as container cranes and unloaders are equipped with a traveling device for self-propulsion. The traveling device is configured to travel along rails laid on the ground, for example.

[0003] By the way, in cargo handling machines, cargo handling operations are performed while the traveling is stopped. Therefore, cargo handling machines are equipped with various braking devices for stopping their own traveling. As braking devices for cargo handling machines equipped with a traveling device that travels on rails, there are braking devices for stopping the rotation of the wheels provided in the traveling device, rail clamps installed on the body of the cargo handling machine to hold the rails, and the like. However, cargo handling machines are large in size and mass. Therefore, when the cargo handling machine is blown by strong winds during cargo handling operations, there is a possibility that the cargo handling machine may run away. If the cargo handling machine runs away, it may lead to serious accidents such as the traveling device crashing into the end buffer and the cargo handling machine tipping over, colliding with other adjacent cargo handling machines, or dropping a container during cargo handling operations.

[0004] Therefore, in recent years, some cargo handling machines are equipped with a rail braking device for preventing runaway or for surely stopping the cargo handling machine with a stronger braking force when runaway occurs. Note that the rail braking device may be installed by adding it to an existing cargo handling machine, or may be installed in the cargo handling machine from the beginning.

[0005] As is well known, a rail brake device consists of a rail brake body comprising a fluid pressure cylinder (such as a hydraulic cylinder) and brake pads that reciprocate vertically in accordance with the operation of the fluid pressure cylinder, and a configuration for controlling the operation of the rail brake body. The rail brake body is configured to stop the cargo handling machine by pressing the brake pads against the upper surface of the rail using the fluid pressure cylinder. Examples of rail brake devices for cargo handling machines include the "rail brake device for track-running machinery" described in Patent Document 1 below. Non-Patent Document 1 below describes an overview of port cargo handling machinery. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2021-104884 [Non-patent literature]

[0007] [Non-Patent Document 1] Ministry of Land, Infrastructure, Transport and Tourism, "Overview of Structural Forms of Port Cargo Handling Machinery," [online], [Accessed March 3, 2022], Internet<URL:https: / / www.mlit.go.jp / common / 001049107.pdf> [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] The rail brake device described in Patent Document 1 is intended to be installed in addition to existing material handling machinery, and is configured to activate the rail brake based on the operating state of the rail clamp, the operating state of the travel brake provided by the travel device, and the travel speed of the travel device. This eliminates the need for wiring work from the control device of the travel device or rail brake, which is usually installed on the structure above the material handling machinery, to the rail brake provided at the lower end of the support leg (leg body), thereby reducing the cost of modifying the control device and wiring, and shortening the modification period.

[0009] However, while the rail brake device described in Patent Document 1 can shorten wiring by detecting signals output from the running gear or rail clamp installed below the material handling machine, it is necessary to draw out signal wires from the running gear or rail clamp. If the specifications of individual material handling machines differ, the method and location of drawing out the signal wires must be changed according to those specifications. Therefore, the construction method is not versatile and cannot dramatically reduce the modification period.

[0010] Furthermore, since it is not easy to design the basic structure and configuration of material handling machinery from scratch, even when installing new material handling machinery equipped with rail brakes, in practice, the rail brakes are often installed by modifying the design while using the specifications of existing material handling machinery as a basis. Therefore, even when installing new material handling machinery equipped with rail brakes, it is necessary to consider the method and location of signal wire extraction, etc., according to the specifications of the material handling machinery to be modified, just as with modification work to install rail brakes on existing material handling machinery.

[0011] Thus, with conventional rail brake systems for material handling machinery, the method and location of signal line extraction must be changed depending on the specifications of the material handling machinery being installed or redesigned. In other words, the construction methods and design modification procedures are not universally applicable, making it difficult to significantly reduce the time required for modification work or design changes.

[0012] Therefore, the present invention aims to provide a rail brake device for material handling machinery that can shorten construction and design periods, and material handling machinery equipped with the rail brake device. [Means for solving the problem]

[0013] One aspect of the present invention for achieving the above objective is a rail brake device installed on a cargo handling machine equipped with a running gear that can travel along rails laid on the ground, A rail brake body that applies braking to the material handling machine by pressing a brake pad, which moves vertically in accordance with the operation of a fluid pressure cylinder, against the upper surface of the rail, A fluid pressure circuit for operating the aforementioned fluid pressure cylinder, An acceleration sensor that outputs an acceleration signal corresponding to the acceleration of the material handling machine, A control unit that outputs a control signal based on the acceleration signal from the acceleration sensor, Equipped with, The fluid pressure circuit includes a valve mechanism controlled by the control signal to adjust the amount of working fluid in the pressure chamber of the fluid pressure cylinder, The acceleration sensor is installed to detect acceleration in at least the direction of travel of the material handling machine. This is a rail brake device for material handling machinery.

[0014] Furthermore, the scope of the present invention also includes material handling machinery equipped with the rail brake device described above and capable of traveling along rails laid on the ground. [Effects of the Invention]

[0015] According to the present invention, a rail brake that can be mounted on a material handling machine without changing its basic specifications or design, and a material handling machine equipped with the rail brake are provided. Other effects will be clarified in the following description. [Brief explanation of the drawing]

[0016] [Figure 1]It is a diagram showing the schematic structure of a handling machine. [Figure 2] It is a diagram enlarging the lower structure of the handling machine. [Figure 3] It is a diagram enlarging the traveling device provided in the handling machine and its periphery. [Figure 4A] It is a diagram showing the schematic structure of the rail brake body provided in the rail brake device according to the embodiment, and showing the state of the rail brake body during braking. [Figure 4B] It is a diagram showing the schematic structure of the rail brake body provided in the rail brake device according to the embodiment, and showing the state of the rail brake body when the braking is released. [Figure 5] It is a diagram showing the schematic configuration of the rail brake device according to the embodiment. [Figure 6] It is a diagram showing the hydraulic circuit provided in the rail brake device according to the embodiment.

Mode for Carrying Out the Invention

[0017] Examples of the present invention will be described with reference to the accompanying drawings. In the drawings used in the following description, the same or similar parts may be denoted by the same reference numerals and redundant descriptions may be omitted. Depending on the drawings, unnecessary reference numerals may be omitted in the description.

[0018] ===Example=== <Basic Structure and Configuration of the Handling Machine>

[0019] As an example of a handling machine equipped with the rail brake device according to the embodiment, a container crane capable of self-running on a rail is cited. FIG. 1 shows the schematic structure of a handling machine 1 equipped with the rail brake device. The handling machine 1 is installed on a quay wall 100 of a harbor. In this figure, it is assumed that the wall surface 101 of the quay wall 100 extends in the direction normal to the paper surface. The handling machine 1 is generally composed of a main body structure 10 that functions to load and unload a container 15, and a traveling device 30 for moving the main body structure 10 along a rail 200 laid on the quay wall 100.

[0020] The main structure 10 consists of legs 20 extending vertically in pairs on the sea side 102 and land side 103 of the quay 100, a girder 11 extending horizontally on the land side, a boom 12 pivotally supported at the seaside end of the girder 11 so as to be able to be raised and lowered, a trolley 13 that moves horizontally guided by the girder 11 and boom 12, and a spreader 14 that can be raised and lowered relative to the trolley 13 to engage with the container 15. The superstructure, including the boom 12, is also equipped with a machine room 16 that houses various electric motors required for cargo handling operations (e.g., hoisting device, traversing device), and a driver's cab 17 where an operator who operates the cargo handling machine 1 sits.

[0021] Here, if we define the direction normal to the wall surface 101 of the quay 100 (left-right direction in the paper) as the front-back direction, with the sea side 102 being the front and the land side 103 being the rear, and the direction along the wall surface 101 of the quay 100 (depth direction in the paper) as the left-right direction, then rails 200 are laid on the quay 100 in the left-right direction. As a result, the cargo handling machine 1 moves in the left-right direction (depth direction in the paper in the figure) by the traveling device 30.

[0022] Figure 2 is an enlarged view of the lower part of the cargo handling machine 1, and corresponds to, for example, a view of the cargo handling machine 1 shown in Figure 1 from the land 103 side or the sea 102 side. In other words, Figure 2 shows a pair of legs 20 on the sea 102 side or the land 103 side. In the cargo handling machine 1 shown here, the legs 20, which are arranged in pairs on the left and right, are connected by sill beams 22 that extend in the left and right direction, and a traveling device 30 is attached to the lower end 21 of each leg 20. The traveling device 30 is driven by electricity from a power supply facility (not shown) installed on the cargo handling machine 1. In the illustrated cargo handling machine 1, rail clamps 40 are installed at the ends of brackets 23 that are vertically mounted in the left and right center of the sill beams 22.

[0023] Figure 3 is an enlarged view of the dashed frame 110 in Figure 2, showing one running device 30 and its surrounding structure. As shown in Figure 3, the running device 30 has a structure in which two bogies 33, each with four wheels 32, are arranged in series. The two bogies 33 are attached to a rocker beam 31 that evenly distributes the load from above in the left-right direction. The rail brake body 60, which is the main component of the rail brake device according to this embodiment, is installed on this running device 30. In the illustrated material handling machine 1, a bracket 36 is provided at the lower end of the rocker beam 31, and the rail brake body 60 is attached to the lower end of this bracket 36.

[0024] <Rail brake body configuration and operation> The basic configuration of the rail brake body 60, which is the main component of the rail brake device, is a fluid pressure cylinder, and the rail brake device according to this embodiment is equipped with a rail brake body 60 mainly composed of a double-acting hydraulic cylinder that uses hydraulic oil as the working fluid.

[0025] Figures 4A and 4B show the schematic structure of the rail brake body 60. Figure 4A shows the rail brake body 60 in the braking state, and Figure 4B shows the rail brake body 60 in the released state. As shown in Figures 4A and 4B, the rail brake body 60 consists of a hydraulic cylinder 61, a brake pad 62, and a connecting member 63 interposed between the lower end of the piston 65 of the hydraulic cylinder 61 and the brake pad 62.

[0026] The hydraulic cylinder 61 includes a cylindrical cylinder tube 64 that also serves as the housing, a piston 65 that slides vertically within the cylinder tube, and a passage 66 for inflowing and outflowing hydraulic fluid into the cylinder tube 64. The hydraulic cylinder 61 in the figure is shown as a cross-sectional view taken by cutting the cylinder tube 64 through a plane that includes the vertical and longitudinal directions passing through the axis 164.

[0027] Inside the cylinder tube 64, a two-stage cylindrical space is formed, with the lower part being smaller in diameter. In this space, the upper cylindrical space is the volume chamber 67. The lower, smaller cylindrical space (hereinafter sometimes referred to as the "sliding chamber 68") maintains its diameter and opens to the lower end of the cylinder tube 64. The piston 65 is a two-stage cylindrical shape with the lower part being smaller in diameter, with the upper, larger cylindrical portion (hereinafter sometimes referred to as the "head 65a") slidably positioned within the volume chamber 67, and the lower, smaller cylindrical portion (hereinafter sometimes referred to as the "body 65b") slidably positioned vertically relative to the sliding chamber 68.

[0028] The vertical length of the piston head 65a is shorter than the vertical length of the volume chamber 67, and the vertical length of the piston body 65b is longer than the vertical length of the sliding chamber 68. The overall vertical length of the piston 65 is designed such that when at top dead center, the lower end of the piston body 65b protrudes slightly downward relative to the cylinder tube 64. A connecting member 63 is connected to the lower end of the piston body 65b, and a brake pad 62 is attached to the lower end of this connecting member 63. Pressure chambers (67a, 67b) are formed above and below the piston head 65a in the volume chamber 67, and the flow path 66 opens to the inner surfaces of the upper and lower pressure chambers (67a, 67b).

[0029] Furthermore, with the brake body 60 having the above-described configuration, the piston 65 can be moved downward by flowing hydraulic fluid into the upper pressure chamber (hereinafter sometimes referred to as the "upper pressure chamber 67a") of the hydraulic cylinder 61 and flowing hydraulic fluid out of the lower pressure chamber (hereinafter sometimes referred to as the "lower pressure chamber 67b"). As a result, as shown in Figure 4A, the brake pad 62 connected to the piston 65 via the connecting member 63 is pressed against the upper surface 201 of the rail 200, and the rail brake body 60 enters a braking state. Also, as shown in Figure 4B, the piston 65 can be moved upward by flowing hydraulic fluid out of the upper pressure chamber 67a and flowing hydraulic fluid into the lower pressure chamber 67b. As a result, the rail brake body 60 enters a braking release state.

[0030] <Outline configuration and basic operation of a rail brake system> The rail brake device according to this embodiment includes, in addition to the rail brake body 60 described above, a configuration for precisely controlling the braking force of the rail brake body 60 when the cargo handling machine 1 runs away, enabling the cargo handling machine 1 to be stopped quickly and smoothly when it is running away.

[0031] Figure 5 shows a schematic configuration of a rail brake device 50 according to an embodiment. The rail brake device 50 according to the embodiment is an electronically controlled brake system and, in addition to the rail brake body 60, is equipped with a basic configuration of a hydraulic circuit 80 which includes a sensor 70 for detecting the runaway state of the cargo handling machine 1, a control unit 51 that outputs a control signal in accordance with the signal output by the sensor 70 when the machine runs away, an amplifier 52 for amplifying the control signal from the control unit 51, and a valve mechanism (hereinafter sometimes referred to as "control valve 81") that operates according to the control signal to adjust the amount of hydraulic fluid in the hydraulic cylinder 61.

[0032] The rail brake body 60 is installed in units of one or more (for example, 1 to 8 units) per material handling machine 1, depending on the size and mass of the material handling machine 1 to which it is installed. In addition, in the rail brake device 50, components other than the rail brake body 60 are arranged in appropriate locations on the material handling machine 1. In the rail brake device 50 according to this embodiment, for example, the control unit 51, amplifier 52, and hydraulic circuit 80 are housed in a single enclosure to form a control unit, and this control unit can be placed on the trolley 33 or on the sill beam 22, etc. Furthermore, as will be described later, the sensor 70 is installed in a location suitable for detecting the runaway state of the material handling machine 1.

[0033] In the rail brake device 50 having the above configuration, the control valve 81 constituting the hydraulic circuit 80 is interposed in the flow path of hydraulic fluid that returns from the pressurizing pump 82 through the hydraulic cylinder 61 to the reservoir tank 83. The control valve 81 has a plurality of ports (81a to 81d) that serve as the inlet and outlet for the hydraulic fluid, and forms a flow path between predetermined ports in response to a control signal from the control unit 51. The hydraulic circuit 80 adjusts the amount of oil in the upper pressure chamber 67a and the lower pressure chamber 67b of the hydraulic cylinder 61, respectively, depending on the state of the flow path formed in the control valve 81. If the cargo handling machine 1 runs away, the control unit 51 outputs a control signal based on the signal output by the sensor 70 according to the state of the runaway, and the control valve 81 forms a predetermined flow path in response to the control signal and moves the piston 65 of the hydraulic cylinder 61 downward. As a result, the brake pad 62 of the rail rake body 60 is pressed against the upper surface 201 of the rail 200, and the cargo handling machine 1 in the runaway state stops.

[0034] <sensor> In the rail brake device 50 according to this embodiment, an acceleration sensor is used for the sensor 70 in order to detect runaway conditions, eliminating the need for modification work or design changes to bring out wiring for operation signals of the traveling device 30, rail clamp 40, etc. The acceleration sensor is, for example, composed of MEMS (Micro Electro Mechanical Systems) and can detect even minute accelerations with high accuracy. As the acceleration sensor, one that detects acceleration in two or three axes may be used, but in order to detect runaway of the cargo handling machine 1 traveling on the rail 200, the rail brake device 50 according to this embodiment uses one that detects acceleration in one axis. This acceleration sensor is installed in an appropriate place on the cargo handling machine 1 (for example, inside the housing of the control unit) so as to detect acceleration in the direction of travel (left and right direction) of the cargo handling machine 1. In this way, according to the rail brake device 50 according to this embodiment, it is possible to install the rail brake device 50 on the cargo handling machine 1 with simple modification work for the minimum necessary wiring, such as wiring for the power supply and wiring to the start switch of the rail brake device 50. Alternatively, it becomes possible to provide a new material handling machine 1 equipped with a rail brake device 50 without requiring significant design changes to the existing material handling machine 1.

[0035] <Hydraulic Circuit> In the rail brake device 50 having the above configuration, the acceleration sensor 70 detects the acceleration in the direction of travel acting on the cargo handling machine 1 and outputs an acceleration signal corresponding to the magnitude of that acceleration. The control unit 51 outputs a control signal based on the acceleration signal from the acceleration sensor 70 to the control valve 81 of the hydraulic circuit 80 via the amplifier 52.

[0036] Figure 6 shows an example of a hydraulic circuit 80 that constitutes the rail brake device 50. The hydraulic circuit 80 includes a control valve 81, a pressure pump 82, a reservoir tank 83, as well as various check valves 85 including a relief valve 84 and a pilot check valve 85a, a pressure switch 86, a pressure sensor 87, etc., which are appropriately positioned. The control unit 51 also receives signals from the open / closed state of the pressure switch 86 on the hydraulic circuit 80 and from the pressure sensor 87, and operates the pressure pump 82 or a predetermined valve mechanism including the control valve 81 according to these signals. As a result, for example, even if there is a slight leak of hydraulic fluid or insufficient pressure on the hydraulic circuit 80 during braking, the amount of hydraulic fluid to the pressure chambers (67a, 67b) above and below the hydraulic cylinder is readjusted, and the braking state is reliably maintained. Furthermore, the hydraulic circuit 80 is equipped with a port 90 for connecting an external hand pump. This allows the hand pump connected to the port 90 to pressurize the hydraulic cylinder 61 and maintain the braking state even if the hydraulic pressure inside the hydraulic cylinder 61 drops due to a power outage or other reasons while the rail brake body 60 is in a braking state.

[0037] The control valve 81 is composed of a 4-port, 3-position directional control valve. This allows a single control valve 81 to control the flow of hydraulic fluid into and out of the upper pressure chamber 67a and the lower pressure chamber 67b of the hydraulic cylinder 61. In this embodiment, a well-known proportional control type control valve 81 is employed, which can precisely control the flow rate and direction of the hydraulic fluid using a control signal amplified by the amplifier 52.

[0038] The control valve 81 forms a flow path between predetermined ports (81a to 81d) according to a control signal from the control unit 51. As a result, the hydraulic fluid delivered from the pressurizing pump 82 is sent to the flow paths (88, 89) connected to the upper and lower pressure chambers (67a, 67b) of the hydraulic cylinder 61, and the hydraulic fluid inside the hydraulic cylinder 61 is returned to these flow paths (88, 89), thereby precisely controlling the amount of hydraulic fluid in the upper and lower pressure chambers (67a, 67b).

[0039] <Braking control> Next, an example of a braking control method for stopping a runaway cargo handling machine 1 using a rail brake device 50 will be described. First, the rail brake device 50 is configured to be activated in conjunction with the operator's operation to stop the running device 30 for cargo handling work. Alternatively, the operator activates the rail brake device 50 during cargo handling work, regardless of the running status of the running device 30. When the rail brake device 50 is activated, the acceleration sensor 70 starts detecting the acceleration applied to the cargo handling machine 1 in the direction of travel (left and right direction) and outputs an acceleration signal. The acceleration signal is output as a positive or negative value depending on the direction of acceleration.

[0040] Since acceleration can occur due to shaking and vibration even when the cargo handling machine 1 is not in a runaway state, the control unit 51 calculates the ground speed of the cargo handling machine from the acceleration signal and its direction. Then, for example, if the speed exceeds a predetermined speed, it determines that the machine is in a runaway state and outputs a control signal to activate the rail brake body 60. As a criterion for determining a runaway state, it is conceivable that the machine is in a runaway state when it reaches a predetermined speed (e.g., 60 m / min) that is greater than the maximum running speed of the running device 30 (e.g., 45 m / min). If the control unit 51 determines that the cargo handling machine 1 is in a runaway state, it provides feedback control to the control valve 81 so that the cargo handling machine 1 comes to a gradual stop at a constant deceleration (e.g., 0.05 G). Of course, if an acceleration greater than the predetermined acceleration is detected, the rail brake body 60 may be activated regardless of the speed.

[0041] As a braking control method using the rail brake device 50, one is also conceivable in which the loading / unloading machine 1 is stopped when an operator who has determined that the machine is running away manually activates the rail brake device 50 in an emergency. In this braking control method, for example, when the control unit 51 receives a signal corresponding to the operation instruction of the rail brake device 50 by the operator, a control procedure is conceivable in which the control valve 81 is feedback controlled based on the acceleration signal so that the loading / unloading machine 1 stops at a predetermined deceleration. In any case, when stopping the loading / unloading machine 1 that is running away, the braking control is performed so that it stops at a constant deceleration rather than being stopped abruptly with excessive deceleration. Furthermore, in the rail brake device 50 according to the embodiment, regardless of the braking control method, the control unit 51 feedback controls the control valve 81 based on the acceleration signal, so the loading / unloading machine 1 does not tilt due to the reaction of a sudden stop, nor does it swing back in the opposite direction to the direction of runaway.

[0042] ===Other Examples=== The above description is merely one example to explain the present invention in an easy-to-understand manner, and the technical scope of the present invention is not limited to what has been described above. The concept of the present invention includes various modifications and applications of the embodiments shown above. It is also possible to replace or delete some of the configurations of the above embodiments, or to add other configurations to the configurations of the above embodiments.

[0043] The acceleration sensor 70 may be installed to detect acceleration in a direction perpendicular to the direction of travel, for example, by adding a sensor that detects acceleration in two axes or acceleration in one axis. This allows the rail brake body 60 to apply braking to the cargo handling machine 1 even when it is buffeted by strong winds in a direction perpendicular to the direction of travel.

[0044] In the rail brake device 50 according to the above embodiment, the rail brake body 60 was attached to the running gear 30, but it is also possible to install it on the sill beam 22, similar to the rail clamp 40 in the cargo handling machine 1 shown in Figure 2.

[0045] The rail brake device 50 according to this embodiment is not limited to having one tachogenerator 170, one control unit 51, one amplifier 52, one hydraulic circuit 80, and one rail brake body 60. For example, when multiple rail brake bodies 60 are installed on one material handling machine 1, the multiple brake bodies 60 may be configured to be individually controlled by multiple control units 51, or one control unit 51 may be configured to control multiple rail brake bodies 60. Furthermore, the control unit 51 does not have to be configured exclusively for the rail brake device 50. For example, the control unit 51 may control the rail brake device 50 and various electric motors (hoisting device, traversing device, etc.) used for material handling operations on the material handling machine 1. In this way, the arrangement and number of components of the rail brake device 50 on one material handling machine 1, or the components of one rail brake device 50, can be changed as appropriate. In any case, the rail brake device 50 only needs to include a tachogenerator 170, a control unit 51, a fluid pressure circuit such as a hydraulic circuit 80, and a rail brake body 60 as its components, and the number of components (170, 51, 80, 60) that a single rail brake device 50 has can be set as appropriate.

[0046] It should be noted, however, that the rail brake device 50 according to this embodiment can be installed on any cargo handling machine 1 that is capable of traveling along the rails 200 laid on the quay 100, and is not limited to container cranes. [Explanation of Symbols]

[0047] 1. Cargo handling machine, 10. Main structure, 20. Legs, 21. Lower end of leg, 22. Sill beam, 30. Running gear, 31. Rocker beam, 32. Wheels of running gear, 33. Bogie, 40 Rail clamp, 50 Rail brake device, 51 Control unit, 52 Amplifier, 60 Rail brake body, 61 Hydraulic cylinder, 62 Brake pad, 63 Connecting member, 65 Piston, 65a Piston head, 65b Piston body, 66 Flow path of hydraulic cylinder, 67 Volume chamber, 67a Upper pressure chamber, 67b Downward pressure chamber, 68 Sliding chamber, 70 Sensor (accelerometer), 80 Hydraulic circuit, 81 Control valve, 82 Pressure pump, 83 Reservoir tank, 100 Quay, 200 Rail, 201 Top surface of the rail

Claims

1. A rail brake device installed on a cargo handling machine having a traveling device capable of traveling along a rail laid on the ground, a rail brake body that applies a brake to the cargo handling machine by pressing a brake pad that reciprocates vertically in response to the operation of a fluid pressure cylinder against an upper surface of the rail; a hydraulic circuit for operating the hydraulic cylinder; an acceleration sensor that outputs an acceleration signal corresponding to the acceleration of the cargo handling machine; a control unit that outputs a control signal based on the acceleration signal from the acceleration sensor; Equipped with the hydraulic circuit includes a valve mechanism controlled by the control signal to adjust the amount of hydraulic fluid in the pressure chamber of the hydraulic cylinder; the acceleration sensor is installed so as to detect acceleration in at least a traveling direction of the cargo handling machine; Rail brake device for cargo handling machinery.

2. A cargo handling machine equipped with a rail brake device and capable of traveling along rails laid on the ground, The rail brake device a rail brake body that applies a brake to the cargo handling machine by pressing a brake pad that reciprocates vertically in response to the operation of a fluid pressure cylinder against an upper surface of the rail; a hydraulic circuit for operating the hydraulic cylinder; an acceleration sensor that outputs an acceleration signal corresponding to the acceleration of the cargo handling machine; a control unit that outputs a control signal based on the acceleration signal from the acceleration sensor; Equipped with the hydraulic circuit includes a valve mechanism controlled by the control signal to adjust the amount of hydraulic fluid in the pressure chamber of the hydraulic cylinder; the acceleration sensor is installed so as to detect acceleration in at least a traveling direction of the cargo handling machine; Loading machinery.

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