JP2014210623A - Rail clamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rail clamp device which can always stably exert proper clamp force and which has excellent durability.SOLUTION: A rail clamp device includes: a clamp unit 2 having a pair of right and left clamp levers 21, 21 having shoes 22, 22 capable of being brought into pressure-contact with head part side faces Rb, Rb of a rail R, a closing-operating resilient energizing member 29 for resiliently energizing the pair of right and left clamp levers such that the shoes are brought into pressure-contact with the head part side faces, and an opening-operating hydraulic actuator 28 for bringing the pair of right and left clamp levers into a shoe opening state against resilient force of the closing-operating resilient energizing member; and a travel truck 3 having a travel roller 31 rolling on the head part upper face Ra of the rail, and mounted with the clamp unit. The rail clamp device is provided with, between the clamp unit and the travel truck, an escaping actuator 5 raising the clamp unit such that lower end edges 22b of pressure-contact faces 22a of the shoes are positioned above the head part upper face of the rail.

Description

  The present invention relates to a rail clamp device.

  Conventionally, a rail clamp device for preventing runaway that is attached to a cargo handling machine such as a container crane that travels along a rail is clamped by pressing the shoes of a pair of left and right clamp levers against the side of the head of the rail. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 2003-238069

  Conventionally, when the cargo handling machine is running, the pressure contact surface of the shoe is released in a horizontal direction so as to be separated from the side surface of the head of the rail, so the rail is bent or the shoe is rolled due to rolling while running. There was a problem that the shoe and the rail were worn by sliding contact with the rail. That is, there is a problem that the clamping force is reduced or the shoe replacement cycle is shortened due to wear of the shoe and the rail.

  Therefore, the present invention prevents the shoe pressure contact surface from sliding on the side surface of the head of the rail during traveling of a rail moving structure such as a cargo handling machine or an open / close roof device, and always stabilizes an appropriate clamping force. It is an object of the present invention to provide a rail clamp device that can be exhibited and has excellent durability.

  In order to achieve the above object, the rail clamp device of the present invention comprises a pair of left and right clamp levers having shoes that are press-contactable to the side surface of the head of the rail, and the pair of left and right sides so that the shoe is press-contacted to the side of the head. And a pair of left and right clamp levers in a shoe open state against the resilient force of the closing actuation bullet biasing member. A clamp unit having a hydraulic actuator for opening operation, and a traveling carriage having a traveling roller that rolls on an upper surface of the head of the rail and mounting the clamp unit, the clamp unit and the traveling carriage With a relief actuator for raising the clamp unit so that the lower edge of the pressure contact surface of the shoe is located above the upper surface of the head. A.

The clamp unit includes posture holding means for moving up and down while holding the clamp unit in a vertical posture.
The relief actuator is a hydraulic cylinder, and includes a common hydraulic pressure generating unit that operates the relief hydraulic cylinder and the opening actuation hydraulic actuator.
In addition, after detecting the shoe open state of the pair of left and right clamp levers, a control unit for operating the release actuator is provided.
The shoe has a guiding gradient surface that contacts the lower end edge of the pressure contact surface and extends outward in the left and right directions downward as viewed from the front.

  According to the present invention, it is possible to prevent the shoe pressure contact surface from sliding on the rail head side surface during travel of the rail moving structure such as a container crane. Durability can be improved by preventing wear of the rail and shoe. A decrease in clamping force due to wear of the shoe and rail can be prevented, and an appropriate clamping force can always be exhibited stably. The frequency of inspection and replacement work of shoes and rails can be reduced.

It is a perspective view which shows one Embodiment of this invention. It is a front view of a shoe pressure contact state. It is a cross-sectional front view of a shoe pressure contact state. It is AA sectional drawing of FIG. It is a cross-sectional front view of a shoe release relief state. It is BB sectional drawing of FIG. It is a principal part expanded end view of a shoe press-contact state. It is a principal part enlarged end view of a shoe open state. It is a principal part expanded end elevation of a shoe open | release relief state. It is a hydraulic circuit diagram which shows an example of a hydraulic circuit. It is a hydraulic circuit diagram of a shoe release relief state.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.
A rail clamp device according to the present invention is attached to a rail moving structure such as a cargo handling machine such as a container crane that travels on a rail, or an open / close roof device that moves along the rail, and the rail moving structure that is stopped is strong wind or the like Is to prevent you from running away.

  As shown in FIGS. 1 to 3, a pair of left and right clamp levers 21 and 21 having a shoe 22 at a lower end 21a that can be press-contacted to a head side surface Rb of a rail R having a cross-sectional shape I, and the shoe 22 is a head. It resists the resilient force of the closing operation bullet urging member 29 for urging and energizing the pair of left and right clamp levers 21 and 21 so as to be in pressure contact with the side surface Rb. Thus, a clamp unit 2 having an opening actuation hydraulic actuator 28 for opening the pair of left and right clamp levers 21 and 21 into the shoe open state is provided.

The clamp unit 2 supports the hydraulic actuator 28 for opening operation and the elastic urging member 29 for closing operation from below, and the lower end portion 21a of the clamp lever 21 is swingable about a front and rear horizontal pivot axis L21. A base member 27 for the clamp unit that pivots is provided.
On the base surface 27a of the horizontal surface of the base member 27, a closing operation bullet urging member 29 made of a compression coil spring is vertically placed, and an opening operation hydraulic actuator 28 is vertically stacked on the inside thereof, and These are arranged coaxially in a plan view.
Hereinafter, the opening actuation hydraulic actuator 28 may be referred to as an opening cylinder 28, the closing actuation bullet urging member 29 may be referred to as a closing spring 29, and the clamp lever 21 may be referred to as a lever 21.

  The clamp unit 2 is connected to the front end of the rod 28b of the opening cylinder 28 and is freely rotatable around a rotation axis L25 that is horizontal in the front-rear direction by an interlocking member 26 that is always elastically biased upward by a closing spring 29. A pair of left and right pressing rollers 25, 25 that are pivotally attached and abut on the upper end portions 21b, 21b of the pair of left and right levers 21, 21, respectively, and a pair of left and right levers for always contacting the upper end portion 21b of the lever 21 with the pressing roller 25 And a tension spring (a spring urging member for opening operation) 24 that urges and urges the upper end portions 21b and 21b of the 21 and 21 to close and close to each other. The lever 21 has a wedge-shaped contact member 23 in a side view in sliding contact with the pressing roller 25 at the upper end 21b.

  When the opening cylinder 28 is in an inoperative state, the clamp unit 2 is moved upward by the upward spring force of the closing spring 29, so that the pressing rollers 25, 25 are raised via the interlocking member 26, and the upper ends of the pair of left and right levers 21, 21 The portions 21b and 21b are pushed apart so as to be separated from each other (against the tension spring 24), and the lower ends 21a and 21a of the pair of left and right levers 21 and 21 are closed so as to approach each other. As shown, the shoe 22 is brought into pressure contact with the head side surface Rb of the rail R, and the head of the rail R is clamped so as to prevent the rail moving structure from running away.

  Further, in the operating state of the opening cylinder 28, it is shortened against the upward elastic force of the closing spring 29, and the pressing rollers 25, 25 are lowered while shortening the closing spring 29 via the interlocking member 26, The upper ends 21b, 21b of the pair of left and right levers 21, 21 are closed by the tension spring 24 so as to approach each other, and the lower ends 21a, 21a of the pair of left and right levers 21, 21 are opened so as to be separated from each other. As shown in FIG. 8, the shoe 22 is configured to be in a shoe open state in which the shoe 22 is spaced apart from the head side surface Rb by the open dimension Z to the left and right outwards (horizontal direction).

As shown in FIGS. 1, 2, and 4, the clamp unit 2 includes a pair of front and rear traveling rollers 31, 31 that roll on the head upper surface Ra of the rail R, and the traveling rollers 31, 31 in a horizontal horizontal direction. It is mounted on a traveling carriage 3 having a traveling base 32 that is rotatably held around an axis.
The traveling roller 31 has a pair of left and right guide flanges 31a and 31a corresponding to the head both side surfaces Rb and Rb of the rail R. The guide flange 31a has vibrations or the like on the traveling base 32. When this occurs, it abuts against the head side surface Rb, thereby restricting the lateral displacement (positional deviation) of the traveling carriage 3 and preventing derailment.

The clamp unit 2 is surrounded by a bracket 1 (indicated by a two-dot chain line) in front, rear, left and right. The bracket 1 is fixed to a rail moving structure (not shown).
When a rail moving structure (not shown) travels along the rail R, a projection (not shown) provided in the bracket 1 abuts against and presses the clamp unit 2, and the traveling carriage 3 travels.

Further, as shown in FIGS. 3 to 6, an escape actuator 5 for raising the clamp unit 2 is provided between the clamp unit 2 and the traveling carriage 3.
The escape actuator 5 is composed of, for example, a hydraulic cylinder 5A, and is provided between the base member 27 and the travel base 32 so as to be vertically extendable, and is provided in the front and rear direction, and the center position of the rail head in the left-right direction. Provided.

  As shown in FIGS. 5 and 6, the escape hydraulic cylinder 5 </ b> A extends to vertically separate the traveling base 32 and the base member 27, so that the clamp unit 2 in the shoe open state is moved upward. As shown in FIG. 9, the shoe 22 is in a relief state where the lower end edge 22 b of the pressure contact surface 22 a of the shoe 22 is located above the head upper surface Ra of the rail R.

  By setting the shoe in the released state, the pressure contact surface 22a is prevented from slidingly contacting the head side surface Rb when the rail R is deformed or a roll occurs during the travel of the rail moving structure. In particular, it is possible to reliably prevent uneven wear where only the left and right sides are worn.

Further, as shown in FIGS. 7 to 9, the shoe 22 has a chamfered guide gradient surface 22d that is in contact with the lower end edge 22b of the pressure contact surface 22a and extends outward in the left and right directions.
When the shoe 22 is lowered from the shoe open relief state of FIG. 9 to the shoe open state of FIG. 8, even if there is a lateral roll or the like, the upper corner portion of the head of the rail R on the guide gradient surface 22d. Rd slidably contacts, the lowering of the shoe 22 is guided, and the problem that the shoe 22 is pushed up by the rail R from below is prevented, and the press contact surface 22a is smoothly arranged facing the head side surface Rb of the rail R. it can.
In particular, when the lower surface 22c of the shoe 22 is released from the upper surface Ra of the head so that the lower surface 22c is in an upper position, the lower surface 22c of the shoe 22 abuts (climbs) the upper surface Ra of the head when descending. It is possible to prevent such problems as stoppage of operation and smooth descent.

Further, in the shoe open state (see FIG. 8), the shoe 22 is spaced from the rail R to the left and right outwards by the open dimension Z, but in the shoe open relief state (see FIG. 9), the shoe 22 is guided. Even if the lower surface 22c of the shoe 22 is positioned lower than the upper surface Ra of the head of the rail R, the rail R is separated from the rail R by the inclined surface 22d with a left-right relief dimension S larger than the opening dimension Z in the left-right direction. It is possible to prevent sliding contact with the rail R due to deformation or rolling.
The guide gradient surface 22d does not require the shoe 22 to be largely released upward, and the escape actuator 5 can be reduced in size (smaller stroke).

  In other words, even if the opening dimension Z in FIG. 8 is smaller than the conventional value, the shoe is released from the state shown in FIG. Widely prevents sliding contact. That is, the swing amount of the lever 21 for releasing the shoe 22 in the left-right direction and the strokes of the opening cylinder 28 and the closing spring 29 can be reduced, and the entire apparatus can be downsized and the center of gravity can be lowered. In addition, it is the guide gradient surface 22d that is not directly related to the clamping force that may come into contact with the rail head side surface Rb due to the relative deflection in the left-right direction, and the pressure contact surface 22a for exerting the clamping force Wear (damage) is reliably prevented.

Next, a rising stopper mechanism 6 that restricts the rising of the base member 27 by the hydraulic cylinder 5 </ b> A is provided between the base member 27 and the traveling base 32.
The ascending stopper mechanism 6 includes a stopper flange 61 that is vertically provided on the traveling base 32 and has an enlarged stepped portion 61a for contact at the upper end, and an enlarged stepped portion that is provided on the base member 27 and rises by a predetermined dimension. A contact surface 62a that comes into contact with 61a from below. The contact surface 62a is composed of an upper opening edge of the through-hole 62 through which the stopper flange 61 (an intermediate portion thereof) passes.
As shown in FIG. 9, the lower end edge 22b of the pressure contact surface 22a is lifted from the head upper surface Ra by exceeding the predetermined clearance height dimension H to the escape hydraulic cylinder 5A. It can be regulated more easily and with higher accuracy than when oil amount and sensor control are performed.

  Further, posture holding means 7 for raising and lowering the clamp unit 2 while holding it in a vertical posture is provided. The posture holding means 7 is provided between the front side of the clamp unit 2 and the front side inner surface 1 a of the bracket 1, and between the rear side of the clamp unit 2 and the rear side inner surface 1 b of the bracket 1.

  The posture holding means 7 includes a vertical round bar-shaped column member 71 in which the lower end portion 71a is attached to the base member 27 and the upper end portion 71b is inserted into the interlocking member 26, and a guide hole portion through which the column member 71 is inserted. 72a and a connecting member 72 having a projecting piece 71b projecting in a horizontal plane perpendicular to the axis of the guide hole 72a, and a face-to-face configuration with a minute gap dimension fixed to the inner surface of the bracket 1 and on the upper surface side of the projecting piece 71b A top contact member 73 having a horizontally long horizontal lower surface 73a, and a horizontally horizontal upper surface 74a which is fixed to the inner surface of the bracket 1 and is disposed in a face-to-face manner with a minute gap on the lower surface side of the projecting piece 71b. And a bottom contact member 74 having the following. The support member 71 and the interlocking member 26 are provided to be relatively slidable in the vertical direction, and the support member 71 and the connecting member 72 are provided to be relatively slidable in the vertical direction.

  Even when the clamp unit 2 moves up and down, even if the clamp unit 2 tilts left and right due to shaking or the like, the upper surface side of the projecting piece 71b comes into contact with the horizontal lower surface 73a of the upper contact member 73, or the lower surface side of the projecting piece 71b is the lower contact member. By abutting against the horizontal upper surface 74a of 74 and holding the projecting piece 71b horizontally, the axial center of the guide hole 72 is made vertical, and the column member 71 is held in a vertical posture (base member 27 And the vertical axis of the clamp unit 2 (the opening cylinder 28 and the closing spring 29) moves up and down while maintaining a vertical posture.

  Further, the protruding piece 71b is not restricted in the horizontal direction from the bracket 1 side, and is not subjected to the horizontal pressing force from the upper contact member 73 and the lower contact member 74 even if the bracket 1 is shaken in the shoe pressure contact state. The posture of the clamp unit 2 is stably maintained.

  Further, as shown in FIGS. 3 to 6, the traveling base 32 has a spherical seat portion 32a having a through hole through which the barrel portion (container portion) 51 of the hydraulic cylinder 5A is inserted. In the hydraulic cylinder 5A, an outer flange portion 52 corresponding to the spherical seat portion 32a (convex downward in a side view) is placed on the spherical seat portion 32a, the shaft center is freely swingable, and bending stress is applied to the rod or the like. It is provided not to receive. Further, the barrel portion 51 is inserted into the through hole of the spherical seat portion 32a, and the lower end portion of the barrel portion 51 is protruded downward from the traveling base 32 so as to lower the center of gravity.

  Next, as in the hydraulic circuit shown in FIG. 10, a common hydraulic pressure generating unit Y for operating the opening cylinder 28 and the relief hydraulic cylinder 5A is provided. The common hydraulic pressure generating unit Y includes an electric hydraulic pump P, an electric hydraulic pump driving motor M, and a hydraulic tank T. In the illustrated example, a manual hydraulic pump 97, a hydraulic gauge 99, and a strainer are provided. 90 mag is also added.

Although not shown in the drawings, an open detection means such as a limit switch that transmits an open signal when a shoe open state is detected, and a low position signal when it is detected that the clamp unit 2 has reached a predetermined low position (a position where the shoe can be pressed). Low position detection means such as a limit switch for transmission.
A control unit 8 is provided for operating the release hydraulic cylinder 5A after receiving the opening signal and operating the opening cylinder 28 after receiving the low position signal.
As shown in FIG. 1, the control unit 8 and the common hydraulic pressure generating unit Y are provided in a casing 10 fixed to the bracket 1.

  As shown in FIG. 10, the hydraulic circuit includes a first electromagnetic switching valve 91 that operates based on signals from the opening cylinder 28, the relief hydraulic cylinder 5 </ b> A, the common hydraulic pressure generation unit Y, and the control unit 8. And a second electromagnetic switching valve 92, a relief valve 93, a flow rate adjusting valve 94 with a check valve for opening and closing corresponding to the opening cylinder 28, and a flow rate control with a check valve for lifting and lowering corresponding to the hydraulic cylinder 5A for relief. A valve 95, a flow control valve 96, and a check valve 98 corresponding to the electric hydraulic pump P are provided.

  An annular flow path 81 configured such that the pressure oil from the electric hydraulic pump P returns to the tank T sequentially through the check valve 98, the flow control valve 96, and the first switching valve 91, the check valve 98, and the flow control. It is configured so that pressure oil branches from between the valves 96 and flows through the flow regulating valve 94 with a check valve for opening and closing to shorten the opening cylinder 28, and return oil when the opening cylinder 28 extends Is opened and closed through a flow rate adjusting valve 94 with a check valve for opening and closing, and a branch connected between the first electromagnetic switching valve 91 and the flow control valve 96 and connected to the second electromagnetic switching valve 92 Pressure oil is released from the flow path 83, the flow path 84 for connecting the second electromagnetic switching valve 92 and the tank T, and the flow regulating valve 95 with a check valve for lifting from the second electromagnetic switching valve 92. The hydraulic cylinder 5A is configured to extend and the return oil when the relief hydraulic cylinder 5A is shortened is the flow rate adjustment with a check valve for lifting and lowering. It includes a lifting channel 85 to flow through the 95, the blind passage 86 connected to the second electromagnetic switching valve 92, the.

The first electromagnetic switching valve 91 is a valve capable of switching whether or not to return the hydraulic oil (pressure oil from the electric hydraulic pump P or return oil from the opening cylinder 28) to the tank T.
The second electromagnetic switching valve 92 communicates the flow path 85 for raising and lowering the flow path 83 and the flow path for sending pressurized oil to the hydraulic cylinder 5 </ b> A, and the flow path for raising and lowering 85 and the flow path 84 for descent. This is a valve that can be switched to a flow path that returns the return oil from the hydraulic cylinder 5A to the tank T.

Further, there is provided a relief flow path 80 that branches from between the electric hydraulic pump P and the check valve 98 and connects the electric hydraulic pump P to the tank T via the relief valve 93.
Further, a manual flow path 87 for connecting the strainer 90 and the electric hydraulic pump P and the open / close flow path 82 via the manual hydraulic pump 97 is provided.

Here, the operation (control) of the hydraulic circuit and the control unit 8 will be described.
FIG. 10 shows a shoe pressure contact state in which the opening cylinder 28 is extended by receiving an upward elastic force from the closing spring 29 and the relief hydraulic cylinder 5A is shortened by receiving the load of the clamp unit 2. Then, the electric hydraulic pump P is driven and the first electromagnetic switching valve 91 is operated so that the pressure oil does not flow to the tank T and the hydraulic cylinder 5A, but flows to the opening cylinder 28, and the upper spring 29 Shorten it against the force and leave the shoe open.

  When the opening detection means transmits an opening signal, the control unit 8 operates the second electromagnetic switching valve 92 to connect the ascending channel 83 and the ascending / descending channel 85 as shown in FIG. It is also sent to the hydraulic cylinder 5A for escape and extended so that the shoe is released.

  Further, in order to change from the shoe release relief state of FIG. 11 to the shoe pressure contact state (clamped state), the second electromagnetic switching valve 92 is operated, and the ascending / descending passage 85 and the descending passage 84 are communicated and raised. The flow path 83 is stopped and put into a piping state. The relief hydraulic cylinder 5A is shortened in response to the load of the clamp unit 2, the return oil is returned to the tank T, and the pressure oil remains in the shortened state of the opening cylinder 28. In other words, the shoe is released from the shoe released state and the clamp unit 2 is lowered. Thereafter, when the low position detecting means transmits a low position signal, the control unit 8 operates the first electromagnetic switching valve 91 to cause the opening cylinder 28 and the tank T to communicate with each other as shown in FIG. 28 is extended by receiving the upward elastic force of the closing spring 29, and the return oil from the opening cylinder 28 is returned to the tank T, so that the shoe is pressed.

In addition, since the hydraulic oil (pressure oil or return oil) flows through the flow rate adjusting valve with open / close check valve (throttle valve for speed control) 94, the pair of left and right shoes 22, 22 are connected to the sudden shoe 22. Generation of contact and impact is prevented.
In addition, since the hydraulic oil (pressure oil or return oil) flows through the flow rate adjusting valve (rising valve for speed control) 95 with a check valve for raising and lowering, sudden rise of the clamp unit 2 and occurrence of impact are prevented. The

  In the present invention, the design can be changed, and the clamp unit 2 is configured such that the opening cylinder 28 and the closing spring 29 extend in the left-right direction, and the opening cylinder 28 and the closing spring 29 extend in the up-down direction. It may be arranged in series without overlapping, or arranged in parallel in the left-right direction. The escape actuator 5 may be an electric actuator. The first electromagnetic switching valve 91 is not limited to a one-way valve, and may be a two-way valve or the like. The second electromagnetic switching valve 92 is not limited to a four-way valve as long as it can switch between pressure oil to the hydraulic cylinder 5A or a flow path and a flow path to return oil to the tank T. Be free. The present invention is referred to as opening (operation) or closing (operation) based on the state of the lower end portions 21a, 21a of the pair of left and right clamp levers 21, 21.

  As described above, the rail clamp device according to the present invention has a pair of left and right clamp levers 21 and 21 having shoes 22 and 22 that are press-contactable to the head side surfaces Rb and Rb of the rail R, and the shoes 22 and 22 are the head side surface Rb. , Rb against the elastic force of the closing operation bullet urging member 29 for urging and energizing the pair of left and right clamp levers 21, 21 and the closing operation bullet urging member 29. A clamp unit 2 having a hydraulic actuator 28 for opening the pair of left and right clamp levers 21 and 21 to open the shoe, and a traveling roller 31 that rolls on the top surface Ra of the head of the rail R. A traveling carriage 3 on which the unit 2 is mounted, and the lower end edges 22b, 22b of the pressure contact surfaces 22a, 22a of the shoes 22, 22 are located above the head upper surface Ra between the clamp unit 2 and the traveling carriage 3. Relief to raise the clamp unit 2 so that Since the bending actuator 5 is interposed, it is possible to prevent the shoe 22 from slidingly contacting the head side surface Rb during the traveling of the rail moving structure. Wear of the rail R and the shoe 22 can be prevented, and durability can be improved. A decrease in clamping force due to wear of the shoe 22 and the rail R can be prevented, and an appropriate clamping force can always be exhibited stably. The frequency of inspection and replacement work of the shoe 22 and the rail R can be reduced. In particular, it is possible to reliably prevent uneven wear such that only one of the left and right sides is worn, and an appropriate clamping force can be stably exhibited.

  Further, since the posture holding means 7 for raising and lowering the clamp unit 2 while holding it in a vertical posture is provided, when the shoe 22 is raised and lowered, the pressure contact surface 22a is in sliding contact with the head side surface Rb in the vertical direction. To prevent uneven wear. The durability of the shoe 22 and the rail R can be improved.

  Further, the relief actuator 5 is a hydraulic cylinder 5A, and includes a common hydraulic pressure generating unit Y that operates the relief hydraulic cylinder 5A and the opening actuation hydraulic actuator 28. The number of parts can be reduced, contributing to miniaturization and weight reduction. Attachment (construction) to the rail moving structure can be performed easily and quickly.

  In addition, the controller 8 that activates the release actuator 5 after detecting the shoe open state of the pair of left and right clamp levers 21 and 21 is surely prevented from malfunctioning ascending in the shoe pressure contact state. Can improve safety. Complex manual operation is not required and the clamp can be released easily and safely.

  Further, since the shoe 22 has a guide gradient surface 22d that contacts the lower end edge 22b of the pressure contact surface 22a and expands to the left and right as it goes downward in a front view, when the shoe 22 is lowered from the shoe open escape state, Even if there is a swing or the like, the head upper corner portion Rd is in sliding contact with the guide gradient surface 22d, and the lowering of the shoe 22 is guided, so that the pressure contact surface 22a can be smoothly disposed facing the head side surface Rb. Further, when the shoe 22 is released so that the lower surface 22c of the shoe 22 is positioned above the head upper surface Ra, the lower surface 22c of the shoe 22 can be prevented from coming into contact with the head upper surface Ra during the descent. And you can descend safely. The left and right escape dimensions S larger than the open dimension Z in the shoe open state can be separated to more reliably prevent sliding contact with the rail R.

2 Clamp Unit 3 Traveling Cart 5 Escape Actuator 5A Hydraulic Cylinder 7 Posture Holding Means 8 Control Unit
21 Clamp lever
22 shoe
22a Pressure contact surface
22b Bottom edge
22d Induction gradient surface
28 Hydraulic actuator for opening operation
29 Bullet energizing member for closing operation
31 Traveling roller R Rail Ra Top face Rb Head side Y Hydraulic pressure generating unit

Claims (5)

A pair of left and right clamp levers (21) and (21) having shoes (22) and (22) that are press-contactable to the head side surfaces (Rb) and (Rb) of the rail (R), and the shoes (22) and (22) are A closing urging member (29) for urging and energizing the pair of left and right clamp levers (21) and (21) so as to be in pressure contact with the head side surface (Rb) (Rb), and the closing operation And a hydraulic actuator for opening operation (28) for opening the pair of left and right clamp levers (21) and (21) against the elastic force of the elastic biasing member (29). Unit (2);
A traveling carriage (3) having a traveling roller (31) that rolls on the top surface (Ra) of the head of the rail (R) and mounting the clamp unit (2);
Between the clamp unit (2) and the traveling carriage (3), the lower end edges (22b) (22b) of the pressure contact surfaces (22a) (22a) of the shoes (22) (22) are the upper surface of the head ( A rail clamp device comprising a release actuator (5) for raising the clamp unit (2) so as to be positioned above Ra).   The rail clamp device according to claim 1, further comprising posture holding means (7) for raising and lowering the clamp unit (2) while holding it in a vertical posture. The escape actuator (5) is a hydraulic cylinder (5A),
The rail clamp device according to claim 1 or 2, further comprising a common hydraulic pressure generating unit (Y) for operating the hydraulic cylinder (5A) for relief and the hydraulic actuator for opening operation (28).   The rail according to claim 1, 2 or 3, further comprising a control section (8) for operating the relief actuator (5) after detecting the shoe open state of the pair of left and right clamp levers (21, 21). Clamping device.   The shoe (22) has a guiding gradient surface (22d) that contacts the lower end edge (22b) of the pressure contact surface (22a) and that extends outward in the left and right directions downward as viewed from the front. 4. The rail clamp device according to 4.

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