JP3079274U - Cargo lifting equipment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In a suspended state in which cargo is held, the held state of the cargo is not released even if the control switch provided in the cargo holding means is released. A pipe line (4) for communicating pilot ports (36a, 36b) of a first pilot valve (36) with a first switching valve (38).
The second pilot valve 46 is provided between 0. The reference pilot pressure and the pilot pressure which is a branch pressure of the fluid pressure supplied to the balancer 16 are constantly applied to the second pilot valve 46. If the pilot pressure to the second pilot valve 46 is smaller than the reference pilot pressure, the first pilot valve 3
By supplying the fluid pressure to 6, the holding means 22 can hold and release the cargo 32. The second pilot valve 46
If the pilot pressure is higher than the reference pilot pressure, the supply of the fluid pressure to the first pilot valve 36 is stopped,
The holding means 22 prevents the holding of the cargo 32 from being released.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 This invention relates to a cargo lifting device, and more specifically, a worker operates a cargo holding means suspended by a balancer to lift and lower the cargo held by the means during transportation. The present invention relates to a cargo lifting device configured to effectively prevent a sudden drop of a cargo due to an operation error of an operator in the above.

[0002]

[Prior art]

 BACKGROUND ART As a support for a worker to transport a heavy load in a factory or a work place, a load lifting device in which a load holding means is suspended from a balancer is preferably used. As shown in FIGS. 6 and 7, the cargo lifting device 10 has a rail 14 of a required length horizontally arranged at the upper end of a column 12 erected on the floor or the like. The balancer 16 is configured to slide along the extending direction of the rail 14. The balancer 16 has a wire 18 hanging down from the main body thereof so as to be wound up, and a hooking member 20 such as a hook connected to a lower end thereof. The cargo holding means 22 is hung on the hanging member 20, so that the holding means 22 is suspended and held by the balancer 16. As shown in the figure, the cargo holding means 22 includes a main body 26 having a grip portion 24 to be gripped by an operator, a double-acting hydraulic cylinder 28 and a clamp member provided below the main body 26. 30.

[0003] By operating a control switch (not shown) disposed in the vicinity of the grip portion 24 to supply or release a fluid such as air to the double-acting hydraulic cylinder 28 at a required pressure, or to release the clamp member 30. Is opened or closed to hold or release the cargo 32. Similarly, by selectively operating a raising / lowering switch (not shown), a fluid pressure from a fluid pressure supply source (not shown) is supplied to the balancer 16 or the fluid pressure is released, whereby the wire 18 is released. It is configured to allow the cargo holding means 22 hung on the hook member 20 to slowly rise or fall while allowing the winding or free rotation of the material.

[0004]

[Problems to be solved by the invention]

 In the above-mentioned cargo lifting equipment, if the cargo holding means is released due to an operator's operation error during the transport of the cargo, there is a risk that this cargo may fall carelessly and cause a personal injury. There is. For this reason, the cargo holding means is provided with a hook, such as a hook, in addition to the holding portion, and when holding the cargo by the holding mechanism, the hook is hooked to the cargo. Thus, even when the holding mechanism is released due to an operator's operation error or the like, it is possible to prevent a cargo accident from falling carelessly from the cargo lifting device to prevent a serious accident. However, it is also the operator's own operation to lock the hook on the cargo, and if the hooking condition is insufficient or the hook is forgotten, the serious accident may occur. become.

[0005]

[Purpose of the invention]

 The present invention has been proposed in view of the above-mentioned problems inherent in the prior art, and has been proposed to appropriately solve the problem. In the suspended state in which the cargo is held, the device is provided on the cargo holding means. It is an object of the present invention to provide a cargo lifting / lowering device in which the holding state of the cargo is not released even when the control switch is released.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems and appropriately achieve the intended purpose, the cargo lifting device according to the present invention supplies fluid pressure to the first port of the double-acting hydraulic cylinder to hold the cargo. And a cargo holding means for supplying fluid pressure to the second port of the cylinder to release the holding, and a first pilot port and a second pilot port, and supplying pilot pressure to any of the pilot ports. Thus, a first pilot valve for selectively switching the fluid pressure from the fluid pressure supply source to the first port or the second port of the fluid pressure cylinder and supplying the fluid pressure from the fluid pressure supply source to the fluid pressure cylinder. A first switching valve for selectively supplying the first pilot port or the second pilot port to switch the first pilot valve and instruct the holding or release of the cargo by the cargo holding means; A balancer for suspending and holding the cargo holding means via a wire, allowing the wire to be wound up or free to rotate by supplying or releasing fluid pressure, and slowly raising or lowering the cargo handling means; And a second switching valve for selectively supplying or releasing the fluid pressure supplied from the fluid pressure supply source to the balancer, and instructing a gradual rise or fall of the cargo handling means. In the elevating device, a fluid pressure from the first switching valve is selectively supplied to the pilot port or stopped between a pipe line communicating the pilot port of the first pilot valve with the first switching valve. A second pilot valve, a reference pilot pressure obtained by adjusting a fluid pressure from the fluid pressure supply source, and a branch pressure from a fluid pressure supplied to the balancer from the second switching valve. A certain pilot pressure is constantly applied to the second pilot valve, and when the pilot pressure applied to the second pilot valve is smaller than a reference pilot pressure, a fluid pressure is supplied from the second pilot valve to the first pilot valve. Then, it is possible to hold and release the cargo by the cargo holding means in accordance with the operation of the first switching valve, and when the pilot pressure applied to the second pilot valve is higher than the reference pilot pressure, Even if the supply of fluid pressure from the second pilot valve to the first pilot valve is stopped and the first switching valve is operated, the holding of the cargo carried by the cargo holding means can be released. It is characterized in that it is not configured.

[0007]

[Embodiment of the invention]

 Next, a cargo handling apparatus according to the present invention will be described below with reference to the accompanying drawings by way of preferred embodiments. As shown in FIG. 1, the cargo lifting device 10 includes a first port 28a and a second port 28a of a double-acting fluid pressure cylinder 28 constituting the cargo holding means 22, as shown in FIG. A line from a fluid pressure supply source 34 is connected to the two ports 28 b via a first pilot valve 36. In this case, when the fluid pressure is supplied to the first port 28a (the right side in the figure), the cargo 32 is held, and when the fluid pressure is supplied to the second port 28b (the left side in the figure), The holding of the cargo 32 is released.

The first pilot valve 36 has a first pilot port 36a and a second pilot port 36b. Each of the pilot ports 36a and 36b is connected to a first switching valve 38 described later by a first pipe. It is connected in a pipeline manner through a channel 40 and a second pipeline 42. By supplying pilot pressure to the first pilot valve 36, the fluid pressure from the fluid pressure supply source 34 is selectively supplied to the first port 28a or the second port 28b of the double-acting hydraulic cylinder 28. The supply is switched to The pipe system will be described by taking an air circuit using air as an example, but this may be replaced with a hydraulic circuit using hydraulic pressure as a medium.

The first switching valve 38 using a two-position switching valve is connected to a pipeline system located upstream of the first pilot valve 36. That is, the first switching valve 38 is a mechanism that constitutes a control switch described in the related art, and as described later, controls the fluid pressure from the fluid pressure supply source 34 to the first pilot port 36a or the second pilot port 36b. The first pilot valve 36 is switched in a predetermined direction to instruct the holding or release of the cargo 32 by the cargo holding means 22. The balancer 16 moving on the rail 14 is connected to a second switching valve 44 constituting a lifting / lowering switch described in the prior art in a pipeline manner. By selectively supplying or releasing the fluid pressure supplied from the supply source 34 to the balancer 16, the cargo holding means 22 is slowly raised or lowered.

As shown in FIG. 1, a second pilot valve 46 is provided between the first pilot port 36 a of the first pilot valve 36 and the first conduit 40 connecting the first switching valve 38. They are connected in a pipeline. As the second pilot valve 46, a two-position switching valve is used similarly to the first pilot valve 36, and the fluid pressure from the first switching valve 38 is selectively supplied to the first pilot port 36a or It is configured to stop supply. The second pilot valve 46 is connected to a third pipe 48 in which a first switching valve 38 branches from a pipe system connected to the fluid pressure supply source 34, and is connected to the third pipe 48. Next, the pressure reducing valve 50 is connected. A reference pilot pressure obtained by adjusting the fluid pressure from the fluid pressure supply source 34 is supplied to the third conduit 48 via the pressure reducing valve 50. Further, a fourth pipeline 52 is connected between the second pilot valve 46 and the balancer 16. The fourth pipe 52 has one end connected to a pipe system connecting the second switching valve 44 and the balancer 16, and a fluid supplied from the second switching valve 44 to the balancer 16. The branch pressure is always applied to the second pilot valve 46.

[0011]

Operation of the embodiment

 Next, an example of the operation of the cargo lifting device according to the above-described embodiment will be described. In the cargo lifting device 10, air is supplied from the fluid pressure supply source 34 to the third conduit 48, and the fluid pressure is supplied to the second pilot valve 46 via the pressure reducing valve 50 as a reference pilot pressure. For example, it is kept at 0.4 Mpa. In a so-called stable state in which the cargo holding means 22 only holds the cargo 32 placed on a mounting table or the like, the second cargo is passed through the fourth conduit 52 connected to the balancer 16. The pilot pressure of the pilot valve 46 is, for example, 0.2 Mpa, which is sufficiently lower than the reference pilot pressure of the third conduit 48 set to 0.4 Mpa. That is, only a pressure that balances the weight of the wire 18 and the hook member 20 is applied to the balancer 16 at this time, so that the second pilot valve 46 is connected to the third conduit 48 as shown in FIG. It is pressed by the reference pilot pressure and moves to the fourth pipeline 52 side. The first conduit 40 and the second conduit 42 are connected to the in-valve passage of the first switching valve 38 in a neutral state, so that both conduits 40 and 42 are open to the atmosphere.

From this state, by moving the first switching valve 38 to the release side (upward in the figure) of the clamp member 30, as shown in FIG. 2, the pipeline system of the fluid pressure supply source 34 is The first pipeline 40 communicates with the first pipeline 40 through the valve passage of the first switching valve 38, and the first pipeline 40 moves to the fourth pipeline 52 side by the reference pilot pressure. It communicates with the valve passage of the valve 46. The second pipe 42 communicates with the atmosphere through another valve passage in the first switching valve 38, so that the fluid pressure is released. Therefore, the first pilot valve 36 receives the load from the fluid pressure supply source 34 set at a higher pressure than the atmospheric pressure to the first pilot port 36a through the first pipe line 40, so that the second pilot valve 36 Move to the road 42 side. As a result, air of a required pressure is supplied from the pipeline system of the fluid pressure supply source 34 to the second port 28b of the double-acting fluid pressure cylinder 28, thereby releasing the clamp member 30 of the cargo holding means 22. Move towards the position.

Next, when the first switching valve 38 is moved to the holding side (downward in the figure) of the clamp member 30, as shown in FIG. Communicates with the second conduit 42 via an in-valve passage of the first switching valve 38. Further, the first pipe line 40 communicating with the first pilot port 36a of the first pilot valve 36 via the second pilot valve 46 is connected to another valve passage communicating with the atmosphere, so that a so-called open state is achieved. Become. Accordingly, the first pilot valve 36 receives the load from the fluid pressure supply source 34 set at a higher pressure than the atmospheric pressure to the second pilot port 36b via the second pipe 42, thereby causing the second pipe 42 Move to the side.

As a result, air at a required pressure is supplied to the first port 28 a of the double-acting hydraulic cylinder 28 from the pipeline system of the hydraulic pressure supply source 34, thereby clamping the cargo holding means 22. The member 30 moves from the release position toward the holding position. That is, when the pilot pressure of the fourth pipe 52 connected to the balancer 16 is lower than the reference pilot pressure of the third pipe 48 connected to the second pilot valve 46, the first switching valve 38 By operating, the clamp member 30 of the cargo holding means 22 can be appropriately switched to either the holding state or the releasing state.

On the other hand, in a so-called unstable state in which the cargo 32 is held by the cargo holding means 22 and lifted by the second switching valve 44, the pilot pressure of the fourth pipeline 52 is increased by the third pipeline. This is about 0.6 MPa, which is sufficiently higher than the reference pilot pressure of 48 (about 0.4 MPa). That is, at this time, the balancer 16 is loaded with the combined weight of the cargo holding means 22 and the cargo 32 as a load, so that the second pilot valve 46 is connected to the fourth pipeline 52 as shown in FIG. And is moved to the third pipeline 48 side by the pilot pressure.

In this state, as described above, when the first switching valve 38 is moved from the neutral position to the side where the clamp member 30 is released, the line system of the fluid pressure supply source 34 is turned off. The first switching valve 38 communicates with the first conduit 40 via an in-valve passage. However, the in-valve passage of the second pilot valve 46 to which the first pipeline 40 communicates is closed on the side of the first pilot valve 36 which communicates with the first pilot port 36a, and the first pilot port 36a The first pipe line 40 on the side connected to the valve communicates with another in-valve passage communicating with the atmosphere. Therefore, the first pilot valve 36 maintains the state in which the first pilot valve 36 has moved from the second pipe 42 to the first pipe 40 when the cargo 32 is held. When the first switching valve 38 is moved to the holding side (downward in the figure) in this state, the pressure from the fluid pressure supply source 34 is supplied to the second conduit 42 as shown in FIG. Therefore, the cargo 32 is kept held. That is, in this state, even if the first switching valve 38 is erroneously switched to the non-holding state, the holding state is maintained.

After the cargo 32 is conveyed and placed on a support table or the like, the pilot pressure applied to the fourth pipeline 52 changes from an unstable state of about 0.6 Mpa to a stable state of 0.2 Mpa. In order to lower the pressure, the second pilot valve 46 is switched from the third pipe 48 to the fourth pipe 52. By moving the first switching valve 38 from the neutral position or the holding position to the release side of the clamp member 30 in this state, as shown in FIG. 2, the pipeline system of the fluid pressure supply source 34 becomes the first switching valve. The first pipe 40 communicates with the first pipe 40 via the valve passage 38, and the first pipe 40 communicates with the valve passage of the second pilot valve 46. The second conduit 42 communicates with the atmosphere through another valve passage in the first switching valve 38. Therefore, similarly to the above, the first pilot valve 36 moves from the first pipe 40 to the second pipe 42 under the load from the fluid pressure supply source 34 set to be higher than the atmospheric pressure. . Then, air of a required pressure, which is a pressure medium, is supplied from the pipeline system of the fluid pressure supply source 34 to one of the double-acting hydraulic cylinders 28 of the cargo holding means 22 to release the clamp member 30. Move to position.

[0018]

[Effect of the invention]

 As described above, in the cargo lifting device according to the present invention, even if the worker erroneously releases the holding mechanism in the suspended state where the cargo holding means holds the cargo, By disposing a pipeline connecting the second pilot valve and the pressure reducing valve, the holding mechanism does not perform the releasing operation. Therefore, there is an advantage that it is possible to prevent the occurrence of a personal injury due to a careless drop of the cargo during transportation.

[Brief description of the drawings]

FIG. 1 is a pipeline diagram showing a state in which no cargo is held in a cargo lifting device according to a preferred embodiment of the present invention.

FIG. 2 is a pipeline diagram when the first switching valve is moved to the release side in a state where the cargo is not held in the cargo lifting device according to the preferred embodiment of the present invention.

FIG. 3 is a pipeline diagram when the first switching valve is moved to the holding side in a state where the cargo is not held in the cargo lifting device according to the preferred embodiment of the present invention.

FIG. 4 is a pipeline diagram when the first switching valve is moved to the release side in a state in which the cargo is held in the cargo lifting device according to the preferred embodiment of the present invention.

FIG. 5 is a pipeline diagram when the first switching valve is moved to the holding side in a state where the cargo is held in the cargo lifting device according to the preferred embodiment of the present invention.

FIG. 6 is a front view of the cargo lifting device according to the preferred embodiment of the present invention;

FIG. 7 is a side view of the cargo lifting device according to the preferred embodiment of the present invention.

[Explanation of symbols]

 16 balancer 18 wire 22 cargo holding means 28 double-acting hydraulic cylinder 28a first port 28b second port 32 cargo 34 fluid pressure supply source 36 first pilot valve 36a first pilot port 36b second pilot port 38 first Switching valve 40 First pipeline 44 Second switching valve 46 Second pilot valve

Claims (1)

[Utility model registration claims] A first port of a double-acting hydraulic cylinder (28)
(28a) is supplied with fluid pressure to hold the cargo (32),
A cargo holding means (22) for releasing the holding by supplying fluid pressure to a second port (28b) of the cylinder (28); and a first pilot port (36a) and a second pilot port (36b). By supplying pilot pressure to any of the pilot ports, the fluid pressure from the fluid pressure supply source (34) is selected to the first port (28a) or the second port (28b) of the fluid pressure cylinder (28). A first pilot valve (36) for selectively switching supply, and selectively supplying fluid pressure from the fluid pressure supply source (34) to the first pilot port (36a) or the second pilot port (36b). A first switching valve (38) for switching the first pilot valve (36) to command the holding or release of the cargo (32) in the cargo holding means (22), and the cargo holding means ( 22) is suspended through a wire (18), and the wire (18) is wound or freed by supply or release of fluid pressure. A balancer (16) that slowly raises or lowers the cargo holding means (22) by allowing rotation, and supplying or supplying fluid pressure supplied from the fluid pressure supply source (34) to the balancer (16). A loading / unloading device comprising a second switching valve (44) for selectively releasing the cargo and instructing the cargo holding means (22) to slowly move up or down, wherein the first pilot valve (36) Pilot port (36a, 36
b) and a line (40) communicating the first switching valve (38),
The fluid pressure from the first switching valve (38) is applied to the pilot port (3
6a, 36b) is provided with a second pilot valve (46) for selectively supplying or stopping the supply, a reference pilot pressure obtained by adjusting the fluid pressure from the fluid pressure supply source (34), and the second switching valve (44) to Balancer (16)
A pilot pressure which is a branch pressure from the fluid pressure supplied to the second pilot valve (46), and when the pilot pressure applied to the second pilot valve (46) is smaller than the reference pilot pressure, , The second pilot valve
(46) to supply fluid pressure to the first pilot valve (36) to hold the cargo (32) in the cargo holding means (22) with the operation of the first switching valve (38); Release, and when the pilot pressure applied to the second pilot valve (46) is larger than the reference pilot pressure, the second pilot valve
Even if the supply of fluid pressure from (46) to the first pilot valve (36) is stopped and the first switching valve (38) is operated, the cargo handling device (22) holds the cargo. A cargo handling device for lifting and lowering a cargo, wherein the cargo (32) is not released from being held.