JPH0512228Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present application relates to an invention in which a setting device in an upper and lower limit stop position setting device for an electric hoist can be set arbitrarily from outside the device.

[Technical background] An electric hoist has a lifting limit stop position and a lowering limit stop position, and the hoisting machine starts operating according to commands to raise or lower the loaded object. This machine winds up and unwinds the rope connected to a heavy object, and when the object reaches a set position, the reducer is operated by a rotary shaft that is linked to the hoisting shaft of the rope that carries out the hoisting action. When the set amount of motion is reached, the limit switch is operated and the energizing circuit of the motor is opened, so that the motor stops operating when the heavy object reaches the set position. It is composed of

[Conventional technology]

In an electric hoist, the electric circuit of the electric hoist is closed in response to a command to start operation, and when the heavy object to be hoisted reaches a set position, the electric circuit of the electric motor is opened by the cable of the hoist shaft. It is generally known that a limit switch with a movable contact that can be set to a set position is sealed in a casing on a switch shaft that operates in conjunction with the rotating shaft of the winding drum.

[The problem that the idea attempts to solve]

The hoisting distance in an electric hoist differs depending on each job, and therefore automatic control of the upper limit stop position and lower limit stop position must be set for each type of work.

The switch that opens the power supply circuit of the electric motor is configured so that the switch shaft is linked to the shaft of the hoisting machine, and the movable contact is moved to set the stop position by the engagement and separation action of a limit switch. As is well known, the limit switch is extremely sensitive to dust and moisture. Therefore, the movable position setting mechanism is installed in a casing sealed with a protective lid, and the lid must be opened each time the position setting needs to be changed. Then, the setting lever of the limit switch was operated to set a new position, and after the operation was completed, the protective cover was closed again.

In this way, it eliminates the hassle of opening and closing the casing every time the position setting needs to be changed, and
The purpose of this is to shorten the time required for setting operations.

[Means to solve the problem]

As a means to achieve the above objectives, this invention is operated by rotational input from the output shaft connected to the reducer part of the electric hoist, and the upper and lower limit stop positions can be changed and set as desired. In a limit switch device equipped with a setting lever, a setting button whose proximal end is connected to the end of the setting lever protruding from the limit switch mounted in the casing is closely connected within a guide bearing mounted on a part of the casing, and The setting button is slidably inserted into the guide bearing and the outer surface of the casing with the outer end surface exposed is brought into contact with a packing that closely penetrates the setting button to maintain airtightness. A protective lid that protects the front and side surfaces of the casing is attached, and a hole is drilled in the side plate of the protective lid at the location where the upper part of the setting button is located, so that the protective lid can be opened and closed from the outside of the casing. It is configured so that setting buttons can be operated.

[Effect]

From the sealed casing with a built-in limit switch, the setting button connected to the setting lever of the limit switch is slidably passed through the casing wall equipped with an airtight guide bearing, packing, etc., and led out of the casing, and the casing is sealed. The setting button, which is projected outside the casing through a hole bored in a side plate connected to the protective lid, is operated by inserting and removing the necessary setting size.

[Example of idea]

Before describing the embodiments of the present invention, the outline of the variable upper and lower limit stop position device of the present invention will be described. The present device is mainly concerned with an improvement of the position setting device which is responsible for the automatic control action of the electric hoist, and is similar to the conventional device as shown in Figs. 1 and 5, and the configuration is the same as that shown in Fig. 2, except for the partial configuration from numerals 9 to 11.

That is, as shown in the first diagram of the electric hoisting machine, the heavy object indicated by the solid line located at the lower limit setting position 5 is moved to the upper limit stop position 4 indicated by the imaginary line by hoisting the rope. This device is designed to allow heavy objects to be raised to the lifting position.The upper limit stop position 4 and lower limit stop position 5 can be set arbitrarily, and the control of the lifting and lowering of the heavy objects can be carried out within the set limits. It is configured such that a stop operation can be automatically controlled in response to a manual operation start command between positions.

To explain these effects with reference to Figure 2,
A speed reducer 2 is interposed between the shaft of the electric hoist drum that winds and unwinds the rope connected to the heavy object and the stop position setting device (quoted from the second diagram). It is transmitted to the limit switch A (see FIG. 5) through the output shaft 3 of No. 2 (refer to the third diagram).

Two setting levers (see Fig. 5) indicated by the symbol D are provided from the limit switch A (see Fig. 4), and the setting lever D is moved upward from the limit switch A at an upward operating distance as shown in Fig. 5. Therefore, an arbitrary position is set.

In other words, in the limit switch A, the rotational movement of the output shaft 3 is converted into a linear movement, and the movement of the switch lever and the setting operation are used to control the movement of the contact point between the limit switch and the moving setting lever D. This is a switch mechanism, ie, an automatic opening control switch, which controls the opening of the already closed electric circuit of the electric hoisting machine.

The limit switch 6 of the present invention, the operating settings within the limit switch 6, and the means for transmitting the driving force for the operation of the limit switch 6 are the same as those of the prior art described above.

An output shaft 3 connected to the reducer section 2 of the electric hoist 1
In the limit switch device, the setting lever 8 is operated by a rotation input from the casing 7 and is provided to protrude from the limit switch 6 installed in the casing 7. The setting button 9 whose base end is connected to the end of the guide bearing 12 mounted on a part of the casing 7 is closely and slidably inserted through the guide bearing 12 to expose the outer end surface of the guide bearing 12 and the outer end surface. A packing 16 that closely penetrates the setting button 9 is brought into contact with the outer surface of the casing 7 to maintain airtightness, and a protective lid 1 is provided on one side of the casing 7 to protect the front and side surfaces of the casing 7.
0, and the side plate 10a of the protective lid 10.
A hole 11 is drilled at the location where the upper part of the setting button 9 is located, and the protective cover 1 is inserted from the outside of the casing 7.
The configuration is such that the setting button 9 can be operated without opening or closing the button 0.

This invention particularly lies in the setting button 9 connected to the setting lever 8 of the limit switch 6 and led out of the casing 7, and the airtightness and support mechanism between the setting button 9 and the casing 7.

There are two setting levers 8 of the limit switch 6 installed in the casing 7, one for the upward limit and the other for the downward limit, and these two levers are installed in parallel and closely penetrate the vertical wall of the casing 7. , the two setting buttons 9, 9 are placed parallel to each other with a certain set distance between them, and are closely and , a guide plate 1 that is slidably inserted in the longitudinal direction and provided on one side of the guide bearing 12.
3, elongated holes 14, 14 are drilled in locations facing the base end positions of the setting buttons 9, 9 in alignment with the longitudinal direction of each of the setting buttons 9, 9, and each of the elongated holes 14, 14 is Penetrating screw 1
5 and 15 are screwed into and fixed to the outer periphery of the body in the direction of the proximal end of the setting buttons 9 and 9, so that movement only in the longitudinal direction of the setting buttons 9 and 9 can be restricted and rotation can be prevented. Configure.

Further, in the direction of the tip of the setting buttons 9, 9, which is outside the guide bearing 12, a packing 16 is inserted in close contact with the outer periphery of each of the setting buttons 9, 9.
the guide bearing 12 in which the inner surface of the packing 16 is exposed flush with the outer surface of the casing 7;
It is constructed so that it comes into contact with the end face of the pipe to further maintain airtightness.

Each of the setting buttons 9, 9 connected to the setting levers 8, 8 of the limit switch 6 installed in the casing 7 having an airtight structure is connected to the casing 7 via a guide bearing 12 that can slide in an airtight manner.
Since the setting buttons 9, 9 are formed outside the casing 7, desired setting operations can be freely performed from outside the casing 7 by inserting and removing the setting buttons 9, 9 of the required dimensions. It is.

[Effect of idea]

In the present invention constructed as described above, a setting button connected to a setting lever of the limit switch is slidably passed through a casing wall equipped with an airtight guide bearing, packing, etc. from a sealed casing containing a limit switch. The setting button, which is led out of the casing and protrudes from the casing through a hole drilled in the side plate that connects to the protective lid that seals the casing, is operated by inserting and removing the required dimensions, so the setting lever of the limit switch is This eliminates the hassle of opening and closing the casing every time the position setting needs to be changed, and also reduces the setting operation time.
In addition, it is mechanically effective in preventing dust and moisture from entering the casing.

[Brief explanation of drawings]

Figure 1 is a side view of the entire device, Figure 2 is a perspective view of the main parts of the device, Figure 3 is a cross-sectional view of the part where the limit switch is attached, and Figure 4 is a partially cutaway view of the setting button protective cover. The front view and FIG. 5 are cross-sectional views of a portion where a conventional limit switch is attached. 1...Electric hoist, 2...Reducer section, 3...Output shaft, 4...Upper limit stop position, 5...Lower limit stop position, 6...Limit switch, 7...Casing, 8...Setting lever , 9... Settings button, 10
...Protective lid, 10a... Side plate, 11... Hole, 12
... Guide bearing, 13 ... Guide plate, 14 ... Long hole, 15 ... Screw, 16 ... Packing, A ...
Limit switch, B... Limit switch case, C... Protective button, D... Setting lever.

Claims (1)

[Scope of utility model registration request] An output shaft 3 connected to the reducer section 2 of the electric hoist 1
In a limit switch device that is operated by rotation input from the casing 7 and is equipped with a setting lever that can arbitrarily change and set the upper and lower limit stop positions,
A setting button 9 whose base end is connected to the end of the setting lever 8 provided protruding from the limit switch 6 installed inside the casing 7 is closely and slidably inserted into the guide bearing 12 mounted on a part of the casing 7. A packing 16, which has passed through the setting button 9, is brought into contact with the outer end surface of the guide bearing 12 and the outer surface of the casing 7 with the outer end surface exposed to maintain airtightness. A protective lid 10 that protects the front and side surfaces of the casing 7
At the same time, the side plate 10a of the protective lid 10 is attached.
A hole 11 is drilled at the location where the upper part of the setting button 9 is located, and the protective cover 1 is inserted from the outside of the casing 7.
1. An upper and lower limit stop position setting device for an electric hoist, characterized in that the setting button 9 can be operated without opening or closing the setting button 9.