CN114787072A

CN114787072A - Cylinder operating device and electric chain hoist

Info

Publication number: CN114787072A
Application number: CN202080085989.4A
Authority: CN
Inventors: 河西贵幸
Original assignee: Kito Corp
Current assignee: Kito Corp
Priority date: 2019-10-21
Filing date: 2020-09-15
Publication date: 2022-07-22
Also published as: JPWO2021079654A1; WO2021079654A1; JP7321661B2

Abstract

The invention provides a cylinder operating device and an electric chain hoist, which can effectively prevent goods from shaking and stabilize the speed of the goods during lifting; a cylinder operation device (60) for operating the driving of a motor (40) for applying a driving force for winding and unwinding a load chain (C1), comprising: the cargo hanging device comprises a cylindrical member (64), a movable handle (70) capable of sliding relative to the cylindrical member (64) along the axial direction, a detection unit (80) for detecting the sliding amount of the movable handle (70), a hook connecting rod (90) which is arranged in the cylindrical member (64) and is connected with a hook (200) for hanging cargoes, and a spring body (100) which is accommodated in the cylindrical member (64) and applies acting force for enabling the hook connecting rod (90) to face upwards.

Description

Cylinder operating device and electric chain hoist

Technical Field

The present invention relates to a cylinder operation device (cylinder operation device) and an electric chain hoist.

Background

For example, in the electric chain hoist, there is a cylindrical (cylindrical) operating device (hereinafter, referred to as "cylindrical operating device") that is operated by a portion gripped by an operator. In this drum handling device, the load chain is wound up and unwound by driving of the motor, and thereby the load attached to the lower hook can be raised or lowered. As such a cylinder operation device, for example, there is a structure shown in patent document 1.

Patent document 1 discloses: in a drum operation device of a type for lifting and lowering a load at a predetermined speed, a structure and control for reducing an impact at the time of lifting and lowering a load from and to the ground are provided.

[ Prior art documents ]

[ patent literature ] A

Patent document 1: japanese patent, Japanese patent No. 5065724

Disclosure of Invention

(problems to be solved by the invention)

However, unlike the cylinder operating device disclosed in patent document 1, which raises and lowers the load at a predetermined speed, a cylinder operating device is conceived which has high responsiveness and can change the speed steplessly by improving the work efficiency. In the development of such a drum operation device, it was found that there was a problem of shaking of the load.

That is, when the handle serving as the operation portion of the cylinder operation device is slid upward with respect to the cylindrical portion while being held by a hand, the motor is driven to rotate the load sheave, and the load chain is wound up to lift the load. At this time, the load chain between the load sheave and the hook is elongated. Thereafter, the rise of the load is started, and the cylindrical portion rises along with the rise of the load. At the time of this raising, the cylindrical portion starts to rise later than the handle held by the hand and then rises faster than the rolling speed, and therefore the position of the handle with respect to the cylindrical portion reaches the initial position.

Further, the load and the tubular member are lifted up relative to the handle by the inertia of the load and the force with which the extended load chain is to be contracted, and the handle is positioned below the initial position relative to the tubular portion.

In the setting in which responsiveness is important as described above, due to inertia at the time of lifting and lowering of the load and the tubular portion and a relative positional change with the position of the handle, a phenomenon of shaking of the load (pitching of the load) in which the lifting and lowering of the load are repeated occurs and is amplified, and convergence thereof becomes difficult. Such a load shake, even if a slight amount of slip is caused, becomes more remarkable in a cylinder operating device capable of continuously and finely shifting a speed, in which operability for linearly changing a speed is emphasized.

Further, although the drum on which the rope is wound is cylindrical, the engaging portion of the load sheave of the load chain is polygonal, and the load chain generates speed variation due to the polygonal effect (influence) in both winding and unwinding. The influence of the speed fluctuation is also transmitted to the cylindrical portion, and a subtle change occurs in the relative position between the cylindrical portion and the handle. Therefore, the speed of the goods during lifting is unstable, and the shaking of the goods is amplified.

The present invention has been made in view of the above circumstances, and an object thereof is to provide: a cylinder operating device and an electric chain hoist capable of effectively preventing the occurrence of shaking of a load, adjusting the speed by a fine operation, and stabilizing the speed when the load is lifted and lowered, in the electric chain hoist having a high speed, a high responsiveness, and an excellent operability.

(means for solving the problems)

In order to solve the above problem, according to a first aspect of the present invention, there is provided a cylinder operating device for operating driving of a motor for applying a driving force for winding up and unwinding a load chain, the cylinder operating device having the following features. It is provided with: the movable handle is slidable in the axial direction relative to the tubular member, the detection unit detects the amount of sliding of the movable handle, the hook connection rod is disposed inside the tubular member and connected to a hook for hanging the cargo, and the spring body is housed inside the tubular member and applies an upward urging force to the hook connection rod.

Further, another aspect of the present invention is preferably: a fixed handle that can be gripped by a hand is attached to the tubular member at a position closer to the hook side than the movable handle in the axial direction, without moving in the axial direction relative to the tubular member, and the spring body is housed and arranged inside the fixed handle.

In addition, another aspect of the present invention is preferably: the detection means is a magnetic sensor that magnetically detects the relative movement of the movable handle with respect to the tubular member.

Further, another aspect of the present invention is preferably: the spring body is formed by stacking a plurality of disc springs.

Further, according to a second aspect of the present invention, there is provided an electric chain hoist having the following features. The present invention is a cylinder operating device including the cylinder operating device according to each of the above inventions, and including: a control unit for controlling the driving speed of the motor to be three steps or more or no step based on the sliding amount of the movable handle detected by the detection unit; a motor whose driving is controlled by a control unit; and a load sheave that is rotated by the motor and that winds and unwinds the load chain.

(effect of the invention)

According to the present invention, it is possible to provide a cylinder operating device and an electric chain block having excellent operability, which can effectively prevent the occurrence of shaking of a load and can stabilize the speed of lifting the load.

Drawings

Fig. 1 is a side view showing an overall configuration of an electric chain hoist according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view showing a configuration of a cylinder operating device provided in the electric chain block shown in fig. 1 and a state seen from a side surface.

Fig. 3 is a perspective view showing a structure of a coned disc spring provided in the cylinder operating device shown in fig. 2.

Fig. 4 is a diagram schematically showing a state in which the load shakes in the electric chain hoist and the cylinder handling apparatus at a stage prior to the implementation of the electric chain hoist according to the present embodiment, where (a) shows an initial state, (b) shows a state in which the movable handle is slid upward, (c) shows a state in which the load and the cylindrical member have reached a neutral position by being lifted up, and (d) shows a state in which the movable handle is positioned downward with respect to the cylindrical member by being lifted up.

Fig. 5 is a schematic view showing a state in which the load shakes as in fig. 4, in which (a) shows a state in which the load and the tubular member have reached the neutral position by being lowered, (b) shows a state in which the movable handle is positioned above the tubular member by being lowered, (c) shows a state in which the load and the tubular member have reached the neutral position by being raised, and (d) shows a state in which the movable handle is positioned below the tubular member by being raised.

Fig. 6 is a diagram schematically showing a state in which the shaking of the load is suppressed in the electric chain hoist and the cylinder operating device of the present embodiment, in which (a) shows an initial state, (b) shows a state in which the movable handle is slid upward, (c) shows a state in which the movable handle reaches a neutral position by the lifting of the load and the tubular member, and (d) shows a case in which the lifting of the load is delayed.

Fig. 7 is a schematic view showing a state in which the load shakes as in fig. 6, in which (a) shows a state in which the spring body is contracted by the rise of the load and the tubular member, (b) shows a state in which the length of the spring body is the same as that in fig. 6 (a), (c) shows a state in which the spring body is extended, and (d) shows a state in which the spring body is contracted by the rise of the load.

Detailed Description

A cylinder operation device (cylinder operation device)60 and an electric chain hoist 10 including the cylinder operation device 60 according to an embodiment of the present invention will be described below with reference to the drawings. In the following description, the Z direction refers to the axial direction of the cylinder operating device 60 (the direction in which the load chain C1 is suspended), the Z1 side refers to the upper side, and the Z2 side refers to the opposite lower side.

< integral Structure of electric chain hoist >

Fig. 1 is a side view showing the overall structure of an electric chain hoist 10 having a cylindrical operating device 60. As shown in fig. 1, the electric chain hoist 10 of the present embodiment includes: an upper hook 20, a chain block body 30, a cylinder operating device 60, a load chain C1, and a lower hook 200. The chain hoist main body 30 includes a motor 40, and the load chain C1 can be wound and unwound by driving the motor 40. The electric chain hoist 10 further includes a bucket 50 for storing the load chain C1.

The electric chain hoist 10 further includes a control unit 45 for controlling the driving of the motor 40. The control unit 45 controls driving of the motor 40 based on a detection signal from a detection sensor 80 described later. The control unit 45 can steplessly (continuously) change the driving speed of the motor 40 in accordance with the amount of sliding of the movable handle 70 detected by a detection sensor 80 (described later). However, the control unit 45 may control the driving speed of the motor 40 to a predetermined level difference such as three or more levels, for example.

The lower hook 200 (corresponding to the hook) is a part for hooking the load W, and a hook lock 202 is further installed to be rotatable around a rotating shaft 201 so as not to drop the hooked load W. The lower hook 200 may be a component of the cylinder operating device 60 or may be a component separate from the component of the cylinder operating device 60.

< construction of Cylinder handling apparatus >

Fig. 2 is a cross-sectional view showing the structure of the cylinder operating device 60 and showing a state viewed from the side. As shown in fig. 1 and 2, the electric chain hoist 10 includes a cylinder operating device 60, and the cylinder operating device 60 is electrically connected to the chain hoist main body 30 via a cable 61 (a winding wire). The cylinder operation device 60 has a cylinder housing 62, and the cylinder housing 62 is provided with an upper case 63, a cylindrical member 64, and a fixed handle 65. The upper case 63, the tubular member 64, and the fixed handle 65 are members having strength capable of receiving the suspension of the load W, and are made of, for example, steel.

The upper case 63 is a portion of the cylindrical case 62 located on the upper side (Z1 side), and is also a portion in which electric wires and the like are housed. A switch (not shown) such as a power button of the cylindrical operation device 60 is attached to a predetermined portion of the outer wall surface of the upper case 63, and a circuit board corresponding to the switch is housed inside the upper case 63. A chain coupling portion 63a is provided on the upper side (Z1 side) of the upper case 63, and the chain coupling portion 63a is coupled to a load chain C1. The lower side (Z2 side) of the upper case 63 is coupled to the cylindrical member 64 by, for example, a screw portion 63 b.

The tubular member 64 is a tubular member located between the upper housing 63 and the fixed handle 65. The cylindrical member 64 is a straight pipe having a constant diameter. Therefore, a movable handle 70 described later can be slid along the tubular member 64.

A fixed handle 65 is firmly attached to the lower side (Z2 side) of the cylindrical member 64 by a screw portion 64 b. The fixed handle 65 is also a tubular member similarly to the tubular member 64, but is different from the tubular member 64 described above in that a lower bottom portion 65a closing the opening on the lower end side (Z2 side) and an outer peripheral portion 65b are provided integrally. Here, the lower bottom portion 65a is a portion that receives a load when the load W is hung on the lower hook 200, and is provided to have a thickness greater than the outer peripheral portion 65b so as to have sufficient strength and guide the hook connecting rod 90. However, if the strength of the lower bottom portion 65a is sufficient, and if the inclination of the hook connecting rod 90 is guided by the outer periphery of the flange portion 92 and the inner periphery of the fixed handle 65, the thickness may be set to be smaller than the outer peripheral portion 65b, or may be set to be the same.

Further, the lower base portion 65a may be configured such that: is separate from the outer peripheral portion 65b, and is fixed to the outer peripheral portion 65b via screws or the like.

The outer peripheral portion 65b of the fixed handle 65 is not a straight pipe having a constant diameter, but is provided so that the diameter to the outer periphery changes (has irregularities). The outer peripheral portion 65b is provided in a concave-convex shape such that the finger of the operator is positioned in the concave portion and the convex portion is positioned between the finger and the finger. In the following description, the concave-convex portion is referred to as a grip portion 65 c. That is, the grip portion 65c is a portion that can be gripped by the hand of the operator.

The movable handle 70 is slidably attached to the tubular member 64. The movable handle 70 is a portion that slides relative to the tubular member 64 or the fixed handle 65 in a state where an operator presses with a thumb or holds with a hand. That is, the movable handle 70 is a portion that slides with respect to the tubular member 64 or the fixed handle 65, and a switch (switch) operation is possible by this sliding.

In order to enable such sliding, the movable handle 70 is provided with an insertion hole 70a, and a fixing screw 71 is inserted into the insertion hole 70 a. Further, the cylindrical member 64 is provided with an elongated hole 64a elongated in the axial direction (Z direction), and a fixing screw 71 is inserted into the elongated hole 64 a. Therefore, the movable handle 70 can slide in the axial direction (Z direction) by a distance corresponding to the axial direction (Z direction) length of the elongated hole 64 a.

Further, a recess 70b into which the operator's fingertip enters is provided on the outer peripheral side of the movable handle 70. By moving the finger with the fingertip positioned in the recessed portion 70b, the movable handle 70 can be slid satisfactorily.

Here, the fixing screw 71 is screwed into the screw hole 72a of the inner movable member 72. The inner movable member 72 is disposed inside the tubular member 64, and is fixed by the fixing screw 71 so as to slide integrally with the movable knob 70. Further, a screw hole 72a for screwing the fixing screw 71 is provided. A sensor movable portion 81 (magnetic element) of a detection sensor 80 described later is attached to the inner movable member 72.

Further, an upper biasing spring 73 for applying a downward force to the inner movable member 72 is disposed above the inner movable member 72 in the inner cylindrical portion of the cylindrical member 64. On the other hand, a lower biasing spring 74 that biases the inner movable member 72 upward is disposed at a lower portion of the inner movable member 72 in the inner cylindrical portion of the cylindrical member 64. When the operator does not operate the movable handle 70, the movable handle 70 and the inner movable member 72 are held at the neutral position by the biasing forces of the upper biasing spring 73 and the lower biasing spring 74.

Further, a spring holder 75 is disposed below the inner movable member 72 in the inner tube portion of the tubular member 64 so as to abut against the lower end side of the lower biasing spring 74. On the other hand, the upper end side of the upper biasing spring 73 is abutted by an upper flange portion (not shown) of the cylindrical member 64.

Further, a detection sensor 80 (corresponding to a detection unit) is disposed above the inner movable member 72. The detection sensor 80 includes a sensor movable portion 81 and a sensor fixing portion 82. The detection sensor 80 is a magnetic sensor that magnetically detects the relative movement of the movable handle 70 with respect to the tubular member 64. A hall sensor is a typical example of such a magnetic sensor. When the detection sensor 80 is a hall sensor, the sensor movable portion 81 is, for example, a magnetic element, and is attached to the upper end portion of the inner movable member 72. On the other hand, the sensor fixing portion 82 is a detection circuit that detects contact or separation of the sensor movable portion 81 as a magnetic element, for example, by using the hall effect. The sensor fixing portion 82 is attached to the upper end side of the tubular member 64.

The sensor fixing portion 82 may be, for example, a magnetic element, and the sensor movable portion 81 may be, for example, a detection circuit. In addition, the detection sensor 80 is not limited to the hall sensor. As the magnetic sensor other than the hall sensor, for example, the detection sensor 80 may be a differential transformer using, for example, a coil, and an MR sensor using a magnetoresistive element, and the like may be mentioned. However, the detection sensor 80 may be a sensor other than a magnetic sensor such as a capacitance sensor.

Further, a hook connecting rod 90, a spring body 100, and a thrust bearing 110 are disposed in the inner cylindrical portion of the fixed handle 65. The hook connecting rod 90 is a rod-shaped (shaft-shaped) member whose lower side protrudes downward through a shaft hole 65a1 formed in the lower base 65 a. A screw portion 91 is provided on the lower end side of the hook connecting rod 90, and the screw portion 91 is screwed into the screw hole 200a of the lower hook 200, thereby firmly connecting the two. Further, a flange portion 92 having a larger diameter than the other portions is provided on the upper end side of the hooking rod 90, and the flange portion 92 presses the spring body 100 from above.

The spring body 100 is formed by stacking a plurality of disc springs 101. Here, as shown in fig. 2 and 3, the adjacent disc springs 101 are arranged so that their vertical directions are opposite to each other. Thus, when the load W is hung on the lower hook 200 and the load W is lifted, the lower hook 200 and the load W can elastically swing (vibrate) in the vertical direction. Although pitching of the cylindrical housing portion 62 can be suppressed when the spring body 100 is soft (the spring constant is small), if it is too soft, it is necessary to extend the length of the cylindrical housing portion 62 to house the spring body 100, but the handling becomes difficult. Therefore, it is preferable to select a spring having the same degree of deflection (expansion and contraction) as that of the load chain C1 and to select the spring body 100 to be accommodated in the fixed handle 65.

Further, the hook connecting rod 90 and the lower hook 200 are connected by the screw portion 91, but it is preferable that: the initial spring pressure of the disc spring 101 of the spring body 100 can be adjusted to a predetermined amount, for example, to: even if the cylindrical case portion 62 is tilted under no load, the lower hook 200 does not rotate around the axis of the hook connecting rod 90 under the influence of the weight of the lower hook 200. When a load of the load W is applied to the lower hook 200, the spring body 100 is flexed, whereby the contact of the upper end portion of the lower hook 200 with the lower surface portion of the lower bottom portion 65a of the fixed handle 65 is released, and the thrust bearing 110 is also operated, so that the lower hook 200 can be easily rotated.

When the spring constant of the used length of the load chain C1 is K1 and the spring constant of the spring body 100 is K2, K1 and K2 are set to be substantially the same. Even if such a spring constant is set, the following is obtained: the pitching of the load W when the load W is lifted is mainly absorbed by the expansion and contraction of the spring body 100. Further, although the load chain C1 has a shorter discharge length and a larger spring constant (which varies depending on the discharge length) due to the winding-up, the spring constant of the spring body 100 is preferably determined with reference to the load chain C1 in a length having a high frequency of use.

The thrust bearing 110 is a bearing that abuts against the lower end side of the spring body 100. Due to the presence of the thrust bearing 110, the hooking rod 90, the spring body 100 and the lower hook 200 can be easily rotated with respect to the fixed handle 65. The length of the fixed handle 65 is about the width of the human palm, and the spring body 100 is housed so as to fall within the length of the fixed handle 65. When the longest length of the load chain C1 is, for example, 3m, if 150kg of cargo W is suspended, the load chain C1 is, for example, elongated by about 6mm, and the spring body 100 is selected as follows: for example, a spring bent by about 5mm to 6mm when the load W is suspended.

< about Effect >

The operation of the electric chain hoist 10 and the cylinder operating device 60 configured as described above will be described below. First, the operation (the part related to the shaking of the load) of the conventional electric chain hoist 10A and the drum handling device 60A will be described. In the following description, the load chain C1 will be described as a spring.

Fig. 4 and 5 are views schematically showing a situation in which the shaking of the load occurs in the electric chain hoist 10A and the cylinder handling device 60A at a stage before the electric chain hoist 10 of the present embodiment is realized. In fig. 4 and 5, the electric chain hoist 10A is configured as described above, and a symbol is denoted by a letter "a". In addition, the load is the load W.

As shown in fig. 4 (a), in the initial state (pre-operation state) of the electric chain hoist 10A, the movable handle 70A exists at the neutral position. At this time, since the motor 40 is not driven, the load pulley 41 does not rotate.

From this state, as shown in fig. 4 (b), the operator grips the movable handle 70A and slides the movable handle 70A upward. Then, the motor 40 is driven based on a detection signal from the detection sensor 80 according to the amount of upward sliding of the movable handle 70A, and the load chain C1 is wound up by rotating (forward rotating) the load pulley 41. In the state shown in fig. 4 (b), the load chain C1 is wound up, but the load W does not start to rise. Thus, load chain C1 elongates.

When the winding up of the load chain C1 is continued, the load W and the tubular member 64A are raised as the load chain C1 is wound up and contracted as shown in fig. 4 (C). Here, the movable handle 70A is a portion that the operator grips, and the height position is hardly changed when the operator continues gripping. In the state shown in fig. 4 c, the movable handle 70A reaches the neutral position (initial position) of the tubular member 64A. Further, the load W generates upward inertia due to the rise of the load W. Therefore, the load W is further moved upward.

Then, when the load W and the tubular member 64A continue to rise, the state shown in fig. 4 (d) is achieved. In fig. 4 (d), the movable handle 70A is positioned relatively downward with respect to the tubular member 64A, and the load chain C1 is in a most contracted state. Then, this time, the motor 40 is driven in the direction of unwinding the load chain C1 based on the detection signal from the detection sensor 80 based on the downward position sliding of the movable handle 70A relative to the tubular member 64A. Thereby, the load chain C1 starts unwinding in accordance with the rotation (reverse rotation) of the load pulley 41 against the will of the operator.

When the unwinding of the load chain C1 is continued, the tubular member 64A descends together with the load W as shown in fig. 5 (a). Then, as shown in fig. 5 (a), the movable handle 70A reaches the neutral position (initial position) of the tubular member 64A. At this time, the downward inertia of the load W is also generated due to the lowering of the load W. Therefore, the load W tends to move further downward.

Then, when the load W and the tubular member 64A continue to descend, the state shown in fig. 5 (b) is achieved. In fig. 5 (b), the movable handle 70A is positioned relatively upward with respect to the tubular member 64A. Further, the load chain C1 is also in an extended state. That is, it can be said that fig. 5 (b) shifts to the same state as fig. 4 (b). Thereafter, the state is again shifted to the state of fig. 5 (c) similar to fig. 4 (c), and then the state is shifted to the state of fig. 5 (d) similar to fig. 4 (d).

In this way, when the load W is intentionally raised and the movable handle 70A is slid upward with respect to the tubular member 64A, the load W is lowered after the rise of the load W, and the movable handle 70A moves up and down with respect to the tubular member 64A, whereby the load W is caused to shake (pitching of the load W) such that the above-described up and down movement of the load W is repeated, and is amplified. Therefore, fine speed adjustment cannot be performed, or the speed and the responsiveness, particularly the responsiveness, cannot be improved.

In contrast, in the electric chain hoist 10 and the cylinder operating device 60 of the present embodiment, the shaking of the loads is effectively prevented. Hereinafter, the operation of the electric chain block 10 and the cylinder operating device 60 of the present embodiment to prevent the shaking of the load will be described with reference to fig. 6 and 7. Further, the spring body 100 is a compression spring configured by overlapping the disc springs 101, but the spring body 100 may be an extension spring. Fig. 6 and 7 show an extension spring as the spring body 100, but the extension and compression of the spring body 100 composed of an extension spring are replaced with the compression and extension of the spring body 100 composed of a compression spring. When the spring body 100 formed of the extension spring is extended or the spring body 100 formed of the compression spring is compressed, the lower hook 200 is displaced downward (away) from the tubular member 64, and when the spring body 100 formed of the extension spring is compressed or the spring body 100 formed of the compression spring is extended, the lower hook 200 is displaced upward (closer) to the tubular member 64.

As shown in fig. 6 (a), in the initial state (the pre-operation state) of the electric chain block 10 of the present embodiment, the movable handle 70 is located at the neutral position, as in fig. 4 (a). Further, the spring body 100 is deflected by the load of the load W and the lower hook 200, and the lower hook 200 is positioned at a position lower than the cylindrical member 64 by a predetermined amount.

From the state shown in fig. 6 (a), as shown in fig. 6 (b), the operator grips the movable handle 70 and slides the movable handle 70 upward. Then, the motor 40 is driven based on a detection signal from the detection sensor 80 according to the amount of upward sliding of the movable handle 70, and the load chain C1 is wound up by rotating (rotating forward) the load pulley 41. Fig. 6 (b) shows a state immediately after the start of the rolling of the load chain C1.

Then, after the state of fig. 6 (b), the winding up of the load chain C1 is started. That is, the state shown in fig. 6 (b) is shifted to the state shown in fig. 6 (c). In the state shown in fig. 6 (c), the load W continues to rise at a speed at which the spring body 100 is flexed stably. At this time, the movable handle 70 is operated by positioning the movable handle 70 at a speed position desired by the operator with respect to the tubular member 64.

After the state shown in fig. 6 (c), even if the operator returns the movable handle 70 to the neutral position, the load W is raised by the upward urging force accumulated in the spring body 100, and the state shown in fig. 6 (d) is obtained, but the tubular member 64 is not displaced relative to the movable handle 70 gripped by the operator.

Then, as shown in fig. 7 (a), the spring body 100 is further contracted, and the rise of the load W is suppressed from being transmitted to the tubular member 64.

Further, after (a) in fig. 7, the contraction of the spring body 100 is released, and the load W descends. Then, as shown in fig. 7 (b), the length of the spring body 100 is the same as that of fig. 6 (a). At this time, downward inertia is generated in the load W due to the lowering of the load W. Therefore, the load W tends to move further downward.

Then, the lowering of the load W and the tubular member 64 is continued, and the state shown in fig. 7 (c) is achieved. In fig. 7 (c), the spring body 100 is elongated. After the spring body 100 is extended, the load W rises as shown in fig. 7 (d). Thereafter, as described above, the extension and contraction of the spring body 100 are repeated, but the vibration thereof is gradually attenuated. The spring body 100 is preferably a compression spring in which a plurality of disc springs 101 are combined, because the attenuation is higher than that of a coil spring.

In this way, in the electric chain hoist 10 and the cylinder handling apparatus 60 according to the present embodiment, after the load W is lifted, the spring body 100 expands and contracts, and the movement of the tubular member 64 in the vertical direction is suppressed. Therefore, even if a detection sensor sensitive to the sliding reaction of the movable handle 70 is used, it is possible to eliminate the situation in which the movable handle 70 moves up and down relative to the tubular member 64, and the motor is wound up and unwound against the operator's will. This prevents the load from shaking, and the load W can be lifted and lowered as intended by the operator.

< about the Effect >

The cylinder operating device 60 configured as described above includes: the cargo hook device includes a cylindrical member 64 provided in a cylindrical shape, a movable handle 70 slidable in an axial direction with respect to the cylindrical member 64, a detection sensor 80 (detection means) for detecting a sliding amount of the movable handle 70, a hook connecting rod 90 disposed inside the cylindrical member 64 and connected to a lower hook 200 (hook) for suspending a cargo W, and a spring body 100 housed inside the cylindrical member 64 and applying an upward biasing force to the hook connecting rod 90.

With such a configuration, even if the load W moves in the vertical direction with a delay after the movable handle 70 is slid with respect to the tubular member 64, the vibration caused by the movement of the load W can be absorbed by the expansion and contraction of the spring body 100. Therefore, the tubular member 64 can be prevented from moving in the vertical direction against the intention of the operator. Therefore, the movable handle 70, which is operated by the operator while holding it, can be prevented from moving up and down relative to the tubular member 64, and therefore the motor 40 can be prevented from rotating forward and backward accidentally. Therefore, the occurrence of the shaking of the load can be suppressed.

In addition, since the load pulley 41 has a polygonal engagement portion with the load chain C1, unlike a cylindrical drum around which a rope is wound, a speed fluctuation due to a polygon effect (influence) occurs in the load chain C1, and the speed of vertical movement of the load W becomes unstable. However, the spring body 100 is provided in the cylinder operating device 60 of the present embodiment. Therefore, by the expansion and contraction of the spring body 100, the speed variation of the load W when the load sheave 41 rotates can be suppressed, and the speed when the load W is lifted and lowered can be stabilized. Further, by appropriately combining the spring constant of the load chain C1 and the spring constant of the spring body 100, the resonance frequency can be changed to be different from the frequency generated by the rotation of the polygonal load sheave 41.

In the present embodiment, a fixed knob 65 that can be gripped by hand is attached to the tubular member 64 at a position closer to the lower hook 200 (hook) side than the movable knob 70 in the axial direction, so as not to move in the axial direction with respect to the tubular member 64, and the spring body 100 is housed and arranged inside the fixed knob 65.

Therefore, the operator can move the thumb while holding the fixed handle 65 with the hand other than the thumb, for example, in a state where the thumb is pressed against the movable handle 70, thereby performing the operation of moving the load W up and down. In this case, the fingers other than the thumb are located on the fixed grip 65, and the thumb is located on the movable grip 70. Therefore, even if the tubular member 64 moves up and down due to the vertical movement of the load W, the distance between the movable handle 70 and the fixed handle 65 can be maintained at a constant distance. Therefore, the motor 40 is driven by an unintended operation of the movable handle 70, and the vertical movement of the load W (load shake) can be more reliably prevented. In addition, although it is effective to prevent the cargo from shaking when the spring constant of the spring body 100 is reduced, the length of the spring body 100 is required when the spring constant is reduced so that the load of the cargo W can be maintained. By housing the spring body 100 in the fixed handle 65, the cylinder operating device 60 can be easily operated, and a small-sized cylinder operating device can be realized without increasing the distance between the movable handle 70 and the lower hook 200.

In the present embodiment, the detection sensor 80 (detection means) is preferably a magnetic sensor that magnetically detects the relative movement of the movable handle 70 with respect to the tubular member 64. When the detection sensor 80 (detection means) is a magnetic sensor, the amount of sliding can be detected even if the movable handle 70 is slightly slid. Therefore, without largely sliding the movable handle 70, the movement amount of the load W in the vertical direction can be accurately controlled by finely adjusting the speed by a small operation.

In the present embodiment, the spring body 100 is configured by stacking a plurality of disc springs 101. Therefore, the spring body 100 can be easily configured simply by overlapping the number of disc springs 101 corresponding to a desired stroke amount (spring constant) inside the fixed handle 65. Further, the spring body 100 in which the plurality of disc springs 101 are stacked is preferable in preventing pitching of the load W because it attenuates more when it expands and contracts than a coil spring.

The electric chain hoist 10 according to the present embodiment includes the above-described cylinder operating device 60, and further includes a control unit 45, a motor 40, and a load pulley 41, wherein the control unit 45 controls the driving speed of the motor 40 to be three steps or more or no step in accordance with the sliding amount of the movable handle 70 detected by the detection sensor 80 (detection means), the motor 40 is controlled to be driven by the control unit 45, and the load pulley 41 is rotated by the motor 40 to wind up and unwind the load chain C1.

Therefore, the movable handle 70 can be prevented from moving up and down relative to the tubular member 64, and the motor 40 can be prevented from rotating forward and backward unexpectedly. Therefore, occurrence of shaking of the cargo can be suppressed.

Further, by extending and contracting the spring body 100, the speed fluctuation when the load sheave 41 rotates can be suppressed, and the speed when the load W is lifted and lowered can be stabilized.

< modification example >

While the embodiments of the present invention have been described above, the present invention can be modified in various ways. This will be described below.

In the above embodiment, the spring body 100 is configured by stacking a plurality of disc springs 101. However, the spring body is not limited to this configuration. For example, a coil spring may be used as the spring body.

In the above embodiment, the lower hook 200 is coupled to the hook coupling rod 90. However, the lower hook 200 may not be connected to the hook connecting rod 90. For example, a chain link may also be mounted on the hooking rod 90.

(symbol description)

10 … electric chain block, 20 … upper hook, 30 … chain block body, 40 … motor, 41 … load pulley, 45 … control unit, 50 … chain bucket, 60 … cylinder operating device, 61 … cable, 62 … cylinder housing unit, 63 … upper housing, 63a … chain link unit, 64 … cylinder unit, 64a … slotted hole, 65 … fixed handle, 65a … lower bottom, 65a1 … shaft hole, 65b … outer periphery, 65c … holding unit, 70 … movable handle, 70a … insertion hole, 70b … recess, 71 … fixed screw, 72 387 72 … inner movable unit, 72a … threaded hole, 73 … upper side urging spring, 74 … lower side urging spring, 75 … spring support unit, 80 … detection sensor (corresponding to detection unit), 81 sensor movable unit, 68582 sensor fixed unit, 90 81 … hook link lever 92, … threaded portion 92, … spring …, … flange …

body

100, 101 … belleville springs, 110 … thrust bearing, 200 … lower clevis, 201 … rotating shaft, 202 … clevis lock, C1 … load chain.

Claims

1. A cylinder operating device for operating the driving of a motor for applying a driving force for winding and unwinding a load chain,

the cylinder operating device is characterized in that,

the disclosed device is provided with: a cylindrical member, a movable handle, a detection unit, a hook connecting rod and a spring body,

the cylindrical member is provided in a cylindrical shape,

the movable handle is slidable in an axial direction relative to the tubular member,

the detection unit detects a sliding amount of the movable handle,

the hook connecting rod is arranged in the cylindrical component and is connected with a hook for hanging goods,

the spring body is housed inside the tubular member and applies an urging force that urges the hook connecting rod upward.

2. The cylinder operating apparatus of claim 1,

a fixed grip that can be gripped by a hand is attached to the tubular member at a position closer to the hook side than the movable grip in the axial direction, without moving in the axial direction with respect to the tubular member,

the spring body is housed inside the fixed handle.

3. Cylinder operating apparatus according to claim 1 or 2,

the detection means is a magnetic sensor that magnetically detects relative movement of the movable handle with respect to the tubular member.

4. Cylinder operating apparatus according to any one of claims 1 to 3,

the spring body is formed by overlapping a plurality of disc springs.

5. An electric chain hoist is characterized in that,

a cylinder handling apparatus according to any one of claims 1 to 4;

further, the present invention is provided with:

a control unit that controls a driving speed of the motor to be three steps or more or no step in accordance with the slip amount of the movable handle detected by the detection unit;

the motor is driven under the control of the control part; and

and a load sheave that is rotated by the motor and that winds and unwinds the load chain.