JPS6261512B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a lifting device that supports a load with claws.

[Prior art]

Traditionally, when lifting a pipe load,
It was considered to employ the lifting device disclosed in Japanese Utility Model Publication No. 57-42949 as a hanging tool. In this lifting device, an L-shaped support frame with horizontal portions as claws is rotatably attached to a moving beam, the moving beam is attached to the beam body so that it can be horizontally moved in the direction in which the claws protrude, and a pipe is attached to the beam body. It is equipped with an alignment device that aligns the claws. Further, the receiving surface of the claw is provided with a detection device directed toward the inner circumferential surface of the pipe. This lifting device is used by being lifted up and down by a crane. When lifting a pipe, lower the lifting device until the centering device touches the pipe so that the claw reaches the end of the pipe, align the center of the pipe and the claw, and then align it with the length of the pipe. Move the moving beam horizontally to bring the claw closer to the end of the pipe. After that, the support frame is rotated in the longitudinal direction of the pipe, the claws are inserted into the pipe, and the lifting device is then raised by a crane to hook the pipe with the claws. When the claw gets caught on the pipe, the detection device receives the load of the pipe and performs a switching operation, confirming that the pipe is caught on the claw.

In such conventional methods, the claws are inserted into the pipe by rotating the support frame itself, so it is necessary to secure a large space in the longitudinal direction of the pipe near the end face of the pipe for the support frame to rotate. . Because of this necessity, if the pipes are stacked without a wide gap between the end faces of adjacent pipes, there is a drawback that the pipes cannot be lifted. Moreover, it is also impossible to carry out loading and unloading operations that increase the loading efficiency by narrowing the distance between the end faces of adjacent pipes. Furthermore, since it is possible to detect that the claw is in a position where it will catch on the pipe only by catching the pipe with the claw, it is necessary to raise and lower the lifting device several times to make sure that the claw does not catch on the pipe. It takes time and effort to check whether you have arrived at the position where you want to receive the information. As a result, cargo handling efficiency was poor.

[Purpose of the invention]

An object of the present invention is to provide a lifting device that hooks loads with claws, so that the loads can be sufficiently hung even when the gaps between the loads are narrow, and the loads can be stacked with narrow gaps between the loads. It's about doing.

[Summary of the invention]

In the present invention, a detection piece for detecting whether or not the end surface of the load has been contacted is provided in the supporting claim so as to be movable in the horizontal direction, and the claw supporting the load can be moved horizontally by rotating from the top to the bottom. The detection piece is provided so as to protrude, and when the claw is rotated upward, the detection piece is pushed in a direction opposite to the protruding direction.When the support frame is moved up and down, the claw and the detection piece It can be stored in a small size and taken in and out through small gaps.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 8.

As shown in FIG. 1, of the ropes 1 and 2 taken out from the winch of the crane, rope 1 is connected to pin 3 and rope 2 is connected to pin 4. The pin 3 is fixed to a hanging bracket 5, and the pin 4 is fixed to a hanging bracket 6. Both suspension brackets 5 and 6 are connected by a joint beam 7. A roller 8 is rotatably attached to the suspension bracket 5, and a roller 9 is rotatably attached to the suspension bracket 6. A guide rail 10 is placed on the roller 8, and a guide rail 11 is placed on the roller 9. The roller 8 is rotatably connected to a motor 12 installed on the hanging bracket 5.

Each guide rail 10, 11 is horizontally fixed near the top of the suspension beam 13. Hanging beam 13
Near the bottom of each guide rail 14, 15 is a first
In the figure, it is divided into left and right sides and fixed horizontally.

A roller 16 is placed on the guide rail 14, and a roller 18 is placed on the guide rail 15. The roller 16 and the roller 18 are rotatably mounted on a bracket 19 and a bracket 20, respectively. The roller 16 is connected to a motor 21 so as to be rotationally driven by a motor 21 provided on a bracket 19, and the roller 18 is connected to a motor 21 so as to be rotationally driven by a motor 22 provided on a bracket 20.
2 is connected. Bracket 19 has hanging beam 1
Moving beam 2 oriented perpendicular to the longitudinal direction of 3
3 is fixed. Further, a movable beam 24 is fixed to the bracket 20 in a direction perpendicular to the longitudinal direction of the hanging beam 13. A guide rail 25 is provided at the lower side of the moving beam 23, and a guide rail 25 is provided at the lower side of the moving beam 23.
Guide rails 26 are fixed to the lower side surfaces of each.

A roller 27 is placed on the guide rail 25, and a roller 28 is placed on the guide rail 26. The roller 27 is rotatably attached to a bracket 29, and the roller 28 is rotatably attached to a bracket 30. The roller 27 is connected to a motor 31 provided on the bracket 29 so that it can be driven to rotate. Similarly, roller 2
8 is connected to a motor 32 so that it can be rotated by the motor 32 provided on the bracket 30. A moving beam 33 is attached to the bracket 29, and a moving beam 33 is attached to the bracket 30.
The movable beams 34 are each fixed in a horizontal state with their longitudinal directions aligned with the hanging beams 13. A horizontal guide rail 35 is provided near the bottom of the moving beam 33, a horizontal guide rail 36 is provided near the bottom of the moving beam 34, and each guide rail 14,
15, each guide rail 25, 26
Each is fixed in a direction perpendicular to the other. The moving beams 33 supported on the guide rails 25 by the rollers 27 rotationally driven by the motors 31 are independently provided on the moving beam 23 as shown in FIG. As shown in FIG. 2, the arrangement is such that it is sandwiched between two left and right moving beams 33, and a fixed beam 37 is located on the central lower surface of the moving beam 23, that is, on the lower surface of the moving beam 23 located directly below the hanging beam 13. A guide rail 35 is also fixed to the fixed beam 37 in a direction parallel to the guide rails 14 and 15 and perpendicular to the guide rails 25 and 26. The mounting heights of the guide rails 35 attached to the beams 33, 34, and 37 are set so that they are all at the same height. Similarly, for the other moving beam 24, moving beams 34 are placed on both the left and right sides sandwiching the fixed beam.
It is equipped with

A roller 38 is placed on the guide rail 35, and a roller 39 is placed on the guide rail 36. The roller 38 is rotatably attached to a horizontal portion of a support frame 40 having a horizontal portion and a vertical portion, and the roller 39 is rotatably attached to a horizontal portion of a support frame 41 having the same shape. The means for attaching such support frames 40 and 41 is such that each beam 3
3, 34, and 37, the three support frames 40 on the left side in FIG. 1 are movable independently by rollers 38, and the three support frames 41 on the right side are movable independently by rollers 39. Prepare for. A motor 42 is installed for each support frame 40, and the motor 42 is connected to a roller 38 for supporting running of the support frame 40 on which the motor 42 is installed so as to rotate the roller 38. Similarly, each support frame 4
A motor 43 is installed for each support frame 41, and the motor 43 can rotate the roller 39 independently for each support frame 41.

As shown in FIG. 1, two sets of futures detection devices 44 and 45 are installed on the suspension beam 13, sandwiched between guide rails 14 and 15. Both futures detection device 4
4 and 45 have the same configuration, and only the configuration of one futures detection device 44 will be described in detail here.

The futures detection device 44 includes a vertical outer frame 46 whose upper part is fixed to the hanging beam 13, a detection rod 47 attached to the outer frame 46 so as to be able to move vertically, and a detection rod 4.
A roller 48 is freely rotatably attached to the lower end of 7.
As shown in FIG.
A pair of suspension beams 13 are arranged to sandwich the suspension beam 13.

A rotating shaft 50 is horizontally attached to a portion near the vertical lower end of each support frame 40, as shown in FIGS. 4, 5, and 6. A portion near one end of a pawl 51 is fixed to the rotating shaft 50, and an operating lever 52 is also fixed thereto. As shown in FIGS. 5 and 6, a roller 53 is attached to the claw 51 as a hook member.
It is rotatably attached in a position that protrudes left and right from 1.

A lower end of an operating rope 54 is connected to the tip of the operating lever 52 . The operating rope 54 passes through a rope sheep 55 which is rotatably attached to the support frame 40 in the middle, and is connected at the upper end to a piston rod of a piston/cylinder device 56. This piston-cylinder device 56 is connected to the support frame 40.
will be installed in

The lower ends of rotary links 57 and 58 are freely rotatably pivoted to the support frame 40 in an upper and lower two-stage arrangement. The upper end of each rotating link 57, 58 is connected to the detection piece 5 so that each rotating link 57, 58 is parallel to each other.
9 is rotatably attached to the shaft. Lower rotation link 5
A stopper 63 that protrudes to a position where it touches 8 is fixed to the support frame 40. By applying the rotary link 58 to this stopper 63, the detection piece 59
The amount of protrusion from the support frame 40 is determined.
As shown in FIG. 3, the detection piece 59 is processed into a gate shape having an opening large enough to allow the claw 51 to rotate through. A portion of this detection piece 59 includes a roller receiving portion 60 that is protruded to a position where the roller 53 hits when the claw 51 rotates upward. The roller receiving portion 60 is bent and has a concave shape as shown in FIG.

A striker 61 is fixed to the upper end of the detection piece 59, as shown in FIG. A limit switch 62 is fixed to the support frame 40, and is arranged so that the tip of the striker 61 comes into contact with the detection piece 59 when it moves to the position indicated by the chain line in FIG.

A limit switch 64 is fixed to the support frame 40, and the limit switch 64 is arranged so that the switch lever touches the claw 51 when the claw 51 projects from the support frame 40, as shown in FIG.

Each limit switch 62, 64 is incorporated into the electrical circuit shown in FIG. That is, the protrusion of the claw 51 is controlled by the lamp 66 using electric power from the power source 65.
A switch 67 connected in series between a power source 65 and a lamp 66 is included in the circuit for lighting and displaying the lamp. With a similar configuration, detection by the detection piece 59 is performed by the power supply 6.
A switch 70 is included in the circuit that lights up the lamp 69 using the power from 8 to display the display. switch 67
The drive relay 71 of the switch 70 and the drive relay 7 of the switch 70
A limit switch 64 is connected to the energizing circuit for the drive relay 72, and a limit switch 62 is connected in series with the limit switch 64 in addition to the limit switch 64.

The structures shown in FIGS. 4, 5, 6, and 8 described above are similarly provided in the support frame 41.

The pipe 73 which is the load is as shown in Figs. 1 and 3.
The pipes 73 are stacked vertically in multiple tiers, and the pipes 73 are stacked in multiple tiers vertically on the floor 74 with a gap L maintained in the horizontal direction as shown in FIG.

A case 76 is fixed to the center of the suspension beam 13 in which the circuit shown in FIG. 8 and the control devices for each motor are installed. Further, each of the lamps 66 and 67 may be provided inside the operator's cab of the crane.

The work of lifting the pipe 73 in this embodiment is as follows.

First, by pulling the operating rope 54 with the piston-cylinder device 56, the operating lever 52 is rotated counterclockwise in FIG. When this is done, the rotating shaft 50 integrated with the operating lever 52 also rotates in the same direction, and the pawl 51 rotates in the direction of arrow A in FIG. 4 and is housed in the support frame 40 as shown in FIG. 7. Claw 5
1 rotates in the direction of arrow A, the roller 53
is caught on the roller receiving part 60, and this roller receiving part 60 is pushed in the direction of arrow A by the roller 53. Therefore, the detection piece 59 is connected to the rotating links 57,5.
With the upward rotation of 8, the lower end of the support frame 40 is moved toward the support frame 40 side as shown in FIG.
It can be accommodated within a narrow width such as L ₁ dimension. At this time, as shown in FIG. 7, the striker 61 hits the limit switch 62 and the pawl 51 comes off the limit switch 64, so in FIG. 8, the limit switch 62 is switched to the energized position, but the limit switch 64 is switched to the non-energized position. So,
Each drive relay 71, 72 is not energized, and the switches 67, 70 are in the de-energized position. Therefore, neither of the lamps 66 and 69 is lit, indicating that the work of storing the claw 51 and the detection piece 59 has been completed.

After the claw 51 and the detection piece 59 are accommodated within the _L1 dimensional width, the crane is moved to position the suspension beam 13 above the pipe 73 located at the center of the three pipes to be lifted. Fine positioning of the hanging beam is performed by rotating the roller 8 with the motor 12 and slightly moving the hanging beam 13.

Next, the support frames 40, 4 are placed at the interval of the gap L.
Move beam 2 so that the distance between the vertical parts of 1 matches.
Move 3 and 24. This movement is carried out by the motor 21
This is done by rotating the roller 16 and the roller 18 with the motor 22 and causing them to run along the guide rails 14 and 15, respectively.

Next, as shown in Figure 2, lift multiple (3)
The moving beams 33, 3 are arranged so that the interval between the vertical parts of the support frames 40, 41 matches the interval between the pipes 73.
Move 4. This movement is achieved by rotating the rollers 27 and 28 with the motor 31 and the guide rails 25 and 28, respectively.
This is done by running the moving beams 33 and 34 along 6.

Next, the hanging beam 13 is lowered by letting out the ropes 1 and 2 from the winch of the crane. As the suspension beam 13 descends, the rollers 48 land on the central pipe 73 of the three pipes 73 to be lifted, as shown in FIG. 3, with the pipe 73 sandwiched therebetween. When landing in this manner, the longitudinal direction of the pipe 73 and the longitudinal direction of the suspension beam 13 are aligned due to the horizontal force generated by narrowing the pipe 73 with the rollers 48, 48. When the suspension beam 13 is further lowered, the detection rod 47 moves up within the outer frame 46, and the upper end of the detection rod 47 hits the switch lever of the detection device 49, causing the detection device 49 to operate. When the detection device 49 is activated, the suspension beam 13 stops lowering. At this point,
The lower vertical portions of the support frames 40, 41 are inserted into the gap L.

In this way, the hanging beam 13 and the pipe 73
Since the longitudinal directions of the three pipes 73 are the same, each of the support frames 40 and 41 can be aligned directly above the center line of each of the three pipes 73.

Next, when the operating rope 54 is loosened by the piston/cylinder device 56, the rotating links 57 and 58 receive the weight of the detection piece 59 and receive the right rotational force in FIG.
Push 3 to the right. For this reason, the claw 51 is
It rotates in the direction of the arrow and projects horizontally from the support frame 40. Further, the rotation links 57 and 58 are rotated clockwise until the rotation link 58 is received by the stopper 63, and the detection piece 59 is rotated toward the support frame 40.
The claw 51 is ejected in the same direction as the protruding direction. At this time, since the rotating links 57 and 58 are parallel to each other, the detection piece 59 is projected and held in a vertical state. The protruding claw 51 is located at the lower end of the support frame 40 seen in FIGS. 5 and 6.
The support bracket 76 fixed to the lower surface of the rotary shaft 5
0 and held horizontally.

When the detection piece 59 and the claw 51 have completed the protrusion movement operation, the switch lever of the limit switch 64 is pushed by the claw 51, and the switch lever of the limit switch 62 is moved from the striker 6.
1 is off. Therefore, in FIG. 8, the limit switch 64 is switched to the energized position, and the limit switch 62 is switched to the non-energized position. For this reason,
The drive relay 71 is energized and switches the switch 67 to the energized position, and the drive relay 72 is not energized and the switch 70 is in the de-energized position. Therefore, the lamp 66 is on and the lamp 69 is off. Each lamp like this 6
It is known that the protrusion of both the detection piece 59 and the claw 51 has been completed when the lights 6 and 69 are turned on and off.

Similarly, a detection piece and a claw are protruded from each support frame 41 as well.

Next, the motor 21 moves the roller 16, and the motor 2
2, the rollers 18 are each rotated to move both moving beams 23, 24 toward the center.
In this way, the claw 51 is pushed into the inside of the pipe 73 longer, and then the detection piece 59 hits the end of the pipe 73, and the reaction force from that hit causes the detection piece 59 to move toward the support frames 40, 41. Pushed in. This pushing force causes the rotating links 57 and 58 to rotate upward while the detection piece 5 moves toward the support frames 40 and 41.
9 is returned. As the return action of the detection piece 59 progresses, the striker 61 finally pushes the switch lever of the limit switch 62. Therefore, the limit switch 62 is switched to the energized position in FIG. 8. At this point, the limit switch 64 has already been switched to the energized position, so each drive relay 71, 72 is energized and each switch 64 is switched to the energized position.
7 and 70 are switched to the energized position. For this reason, the lamps 66 and 69 are lit together, and in this lighting condition it is known that the claw 51 has been sufficiently inserted into the pipe 73.

If the lengths of the three pipes 73 for lifting purposes are different or the ends of the three pipes 73 are not in line due to misalignment of the pipes 73, each of the three support frames 40 may be The claw 51 is moved and pushed into the pipe 73, and whether the claw 51 is pushed in sufficiently is confirmed by lighting the lamps 66 and 69. To move each support frame 40 individually, a motor 42 provided for each support frame 40 is used.
The roller 38 of each support frame 40 is rotated along the guide rail 35. Similarly, each support frame 41 can be moved individually along the guide rail 36, even if the end faces of the three pipes are uneven.
Or even if the three pipe lengths are different, the claw 5
1 can be sufficiently inserted into the three pipes 73.

Next, when the lifting beam 13 is raised by winding up the ropes 1 and 2 with a crane winch, the three pipes 73 are hooked by the claws 51 and lifted up. During this lifting, if it is thought that the suspension balance is poor, the motor 12 rotates the roller 8 to displace the relative position of the suspension brackets 5, 6 and the suspension beam 13, thereby stabilizing the suspension balance. Transport the pipes lifted by a crane.

Next, when the pipes 73 that have been lifted and transported are to be stacked, the ropes 1 and 2 are let out from the winch of the crane, the hanging beam 13 is lowered, and the pipes 73 are landed at the target position. When adjusting the landing position of the pipe 73 before landing, the motor 12
This is done by rotating the roller 8 to move the hanging beam 13, or by moving the movable beams 33 and 34 along the guide rails 25 and 26. Once the pipe 73 has landed at the target position, the suspension beam 13 is further lowered to secure a space above the claw 51 in which the claw 51 can rotate upward, and then the operating rope 54 is pulled up using the piston-cylinder device 56. The claw 51 is rotated and stored on the support frames 40 and 41 side, and the detection piece 59 is
are brought to support frames 40 and 41. In this way, the protrusion of the claw 51 and the detection piece 59 is almost eliminated, and by simply raising the hanging beam 13, it is possible to move on to the next lifting operation without getting caught on the pipe 73. In this way, the support frame 4
Since the support frames 40, 41 can be removed from the pipes 73 without any movement in the longitudinal direction of the pipes 73, the pipes 73 can be stacked with the gap L reduced. Especially when loading, the hanging beam 13 is attached to the hanging bracket 5,
6, the pipe 73 can be easily stowed in a corner of the ship where the ropes 1 and 2 cannot be moved.

In addition, when lifting the pipe 73, the winch of the crane is stopped by the detection operation of the detection device 49,
Based on the detection signal from the detection device 49, a series of operations is performed to extend the piston-cylinder device 56 and then cause the motors 42 and 43 to rotate to move the support frames 40 and 41 in the direction in which the claws 51 are thrust into the pipe. By providing a control circuit that generates the load and a control circuit that stops the motors 42 and 43 in response to a detection signal from the limit switch 62, the work of hooking the pipe 73 during lifting can be automated and the work efficiency can be improved.

According to this embodiment, the following advantages can be obtained.

(1) Lower the vertical parts of the support frames 40 and 41 to the side of the pipe 73 with almost no protruding parts, and then attach the claws 51 and the detection piece 59 to the pipe 73.
Since it can protrude to the third side, even pipes placed in a narrow pipe end interval L can be easily pulled up.

(2) When pulling out the vertical parts of the support frames 40 and 41 from the pipe end gap, use the claw 51 or the detection piece 59.
Since the pipes can be stacked with almost no protrusion, the pipes can be stacked in a state where the distance L between the pipe ends is narrow, and the stacking efficiency is improved.

(3) The support frames 40 and 4 of the detection piece 59 confirm that the claw 51 has penetrated into the pipe 73 sufficiently.
Since it can be detected by the biasing action to the 1 side, reliable hooking work can be easily confirmed and carried out without having to try hooking many times.

(4) In addition to lifting multiple pipes 73 at the same time, the support frames 40 and 41 can be moved in the longitudinal direction of the pipes 73 and in the direction orthogonal to that direction. Even if different pipes are included or the pipes have different diameters, the support frames 40, 4 may be attached to the end positions and diameters of the pipes.
It can be lifted by aligning the position 1, which improves work efficiency.

(5) By landing the rollers 48 on the pipe 73 so as to sandwich the pipe 73, the directionality of the suspension beam 13 and the pipe 73 can be aligned, and at the same time, the swinging movement of the suspension beam 13 can be stopped, so the support frame 40, 41 with respect to the pipe 73 is easy.

(6) The support frames 40 and 4 are activated by the operation of the detection device 49.
It can be seen that the vertical part of 1 has descended to a position facing the end of the pipe 73, so the claw 51
Vertical alignment between the pipe 73 and the pipe 73 is easy.

(7) Not only can the hanging beam 13 and the hanging brackets 5 and 6 move relative to each other, but also the movable beams 33 and 34 can move in a direction perpendicular to the longitudinal direction of the hanging beam 13 while supporting the support frames 40 and 41. Therefore, the hanging position of the suspended pipe 73 can be determined freely, and the pipe can be lowered into a narrow place or a position where the ropes 1 and 2 cannot be accessed, or the pipe can be suspended from that position. You can also adjust the hanging balance.

(8) Before the vertical parts of the support frames 40, 41 collide with the pipe ends, the limit switch 62 is activated, and the support frames 40, 4 are activated based on the operation.
Since it is possible to obtain the timing to stop the movement toward the end of the pipe 1, the support frame 4
0, 41 is less likely to be damaged by moving the support frames 40, 41 too close together.

(9) Since the operating position of the claw 51 and the detection piece 59 can be confirmed by the combined state of the lamps 66 and 69 being turned on and off, reliable work can be accomplished.

(10) Since the detection piece 59 has an opening large enough for the rotating claw 51 to enter and exit, the detection piece 59 is brought close to the claw 51 so as to straddle the claw 51 to make it easier to detect the pipe, and then the claw 51 The _L1 dimension can be made extremely narrow. This has the advantage that it becomes easier to lower the support frames 40, 41 to the sides of the pipe ends.

In this embodiment, the load is described as a pipe 73, but it may be a coil with something wrapped around a hollow core, or even if the load is not hollow, it can be handled as long as it has a shape that the claws 51 can catch. can. Also,
If the claw 51 is made long, it can handle small loads.
Since it is not necessary to insert the claws 51 from both sides of the load, a structure may be adopted in which the claws 51 are inserted from one side and the claws 51, beams, support frames, etc. on the other side are omitted.

〔Effect of the invention〕

As described above, in the present invention, the protrusion of the detection piece is controlled by the rotation of the claw, so when the claw is rotated upward, the detection piece is also pushed in, and the lower end of the support frame is aligned with _L1 . Because of the small size, the lower end of the support frame can be raised and lowered in narrow spaces, and loads placed at narrow intervals can be lifted or loaded at narrow intervals.

[Brief explanation of the drawing]

FIG. 1 is an overall view of a lifting device according to an embodiment of the present invention, FIG. 2 is a schematic view taken along the line B-B in FIG. 1, and FIG.
The figure is a schematic cross-sectional view taken along the line C-C in Figure 1, Figure 4 is an enlarged detailed view of the section viewed from Figure 1 in the direction of D, Figure 5 is a right side view of the main part of Figure 4, and Figure 6 is 4 is a sectional view taken along the line E-E in FIG. 4, FIG. 7 is an elevational view of the device shown in FIG. FIG. 2 is an electrical circuit diagram employed in one embodiment. 13... Hanging beam, 14, 15, 25, 26,
35, 36...Guide rail, 16, 18, 2
7, 28, 38, 39, 53...Roller, 2
3, 24, 33, 36... moving beam, 40, 4
1... Support frame, 50... Rotating shaft, 51...
Claw, 52... operating lever, 54... operating rope,
56... Piston cylinder device, 57, 58
... Rotating link, 59 ... Detection piece, 60 ... Roller receiver, 61 ... Striker, 62, 64 ...
...Limit switch, 63...Stopper, 6
6,69...Lamp.

Claims (1)

[Claims] 1. A suspended beam provided with a support frame provided with a claw that projects horizontally to support a load, a drive device that rotates the claw in the vertical direction, and a detection piece that moves in the horizontal direction. In the load lifting device, the support frame is horizontally movable, and the detection piece has a vertical surface extending upward from the height of the claw behind the tip of the claw that protrudes in the horizontal direction. An opening is cut out in the center of the lower end through which the claw can pass when the claw rotates in the vertical direction, and the upper part of the detection piece and the support frame below it are connected. a first rotary link connects the lower part of the detection piece and the support frame below it, a second rotation link that hits the detection piece in order to set the lower limit position of the detection piece; A stopper is provided on the support frame, and a first limit switch is provided on the support frame that is activated when the detection piece hits a load and is pressed, and the detection is performed when the claw rotates upward from the protruding state. The claw is provided with a member that pushes the piece in a direction opposite to the protruding direction of the claw, and the support frame is provided with a second limit switch that is activated when the claw is in the protruding state. Load lifting equipment.