JPS6364398B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a chain hoist, and more particularly, to a chain hoist that uses an electric motor as a drive source to hoist and hoist a load by transmitting power using a load chain as a medium. It is something.

[Prior art]

First, an example of a conventional electric chain hoist will be described with reference to a partially exploded sectional view of a conventional general electric chain hoist shown in FIG.

In the figure, 1 is an upper hook for suspending the main body;
2 is an electric motor; 3 and 4 are main frames; 5 is a coupling for connecting the electric motor 2 and the first-stage pinion 6; 7 is an electromagnetically actuated brake; 8, 9, 10, 1
1 and 13 are two-stage pinions related to the reduction gear group;
They are stage gear, 3 stage pinion, 2 stage gear, and 3 stage gear.

12 is an electromagnetic switch; 14 and 16 are collars and stepped bolts that fix the main frames 3, 4 and the auxiliary main frame 20 at a constant interval; 15 is a link chain related to the cargo chain; 17 is a In the load sieve,
18 is a sprocket guide, 19 is a lower hook for suspending a load, 21 is a push button switch, and C is a cover.

That is, the main components of the electric chain hoist are an electric motor 2, a brake 7, a reduction gear group, a load sheave 17, a link chain 15, an electric control section,
Furthermore, there are upper and lower hooks 1, 19, etc., and the principle of their operation is as follows.

By operating the push button switch 21, the electric motor 2 and the brake 7 are energized, and the electric motor 2 rotates at the same time as the brake 7 is released.The rotation is transmitted to the first stage pinion 6 via the coupling 5, and the following several stages are activated. It is finally transmitted to the load sheave 17 via a reduction gear train, and its rotation causes the link chain 15 to wind and move the lower hook 19 up and down.

Among the main parts mentioned above, the load-bearing parts such as the upper hook 1 and the load sheave 17 are the main frame 3 made of steel plates,
The reduction gear group is held between one main frame 4 and the auxiliary main frame 20 by several stepped bolts 16.

The electric motor 2 is attached to the other main frame 3, and is connected to a first stage pinion 6 by a coupling 5 between the main frames 3 and 4.
A brake 7 is attached to the auxiliary main frame 20, which is covered by a cover C.

However, the electric chain block of this exemplary construction has the following drawbacks.

(1) In order to increase the torsional rigidity of the two main frames and the auxiliary main frame, four to five specially shaped stepped bolts are required, which increases the number of parts and makes assembly difficult.

(2) Periodic inspections are legally required for this type of hoisting machine, but the only way to inspect the load-bearing parts, such as the load sheave, is to disassemble the whole thing. It requires a lot of time and effort.

(3) In order to improve the rainproofness between the main frames, a cover with a complicated shape is required, resulting in an increase in cost.

Next, FIG. 2 is an exploded sectional view of a main part of an electric chain block according to another prior art, and FIG. 3 is an exploded view showing the outline of the main body structure.

The illustrated electric chain block has the following construction in order to overcome some of the drawbacks of the prior art described above.

That is, the electric motor 2 is attached to one of the main frames 3 and 4 made of two steel plates, and the gear casing (1) 22 is attached to the other. )22, (2)
The gear casing (1) is the same as 22.
(2) 23 constitutes a gear case, and electrical components 24 and the like are mounted on the gear casing (2) 23.

Between the two main frames 3 and 4 is a load sheave 17.
is held in place in the same way as in the previous example, but instead of stepped bolts, a center frame 25 made of cast metal such as aluminum is placed, and these are fixed with several bolts 26. However, in order to prevent deformation of the main frames 3 and 4 due to screw tightening, a collar 27 is also used as necessary.

Although some of the drawbacks of the above-mentioned example, such as eliminating the need for specially shaped stepped bolts due to the effect of the center frame 25, the electric chain block with the above configuration has many problems. It requires a large number of parts, and the only way to inspect the load sheave 17 and the like is to disassemble almost the entire thing, which has the disadvantage of being laborious and time-consuming.

[Purpose of the invention]

The present invention solves the drawbacks of hoisting machines such as electric chain hoists according to the prior art as described above, and provides a chain hoist that is composed of a small number of parts, is easy to disassemble and inspect, and is easy to assemble. That is the purpose.

[Summary of the invention]

In order to achieve the above object, the present invention molds a housing for housing the electric motor and a gear case from cast metal such as aluminum, and places a main frame made of a steel plate on the inside thereof, with the joint surface of these parts near the center of the load sheave. It is designed to be worn.

The structure of the chain hoist according to the present invention is that two main frames made of steel plates are attached to the inside of each of the housing for storing the electric motor and the gear case, which are molded by casting, and a load sheave is installed between these two main frames made of steel plates. In the chain hoist, the main body is formed by supporting the upper hook between the main frames, and the housing and gear case of the main body are divided into two parts near the center of the load sheave and are joined together. At the same time, a vertically open engagement recess is formed inside each of the housing and the gear case and on the side of the rotating shaft of the electric motor, and the engagement recess has a width narrower than the horizontal width of the housing and the gear case. It is equipped with a main frame made of steel plate.

[Embodiments of the invention]

Next, an embodiment of the chain hoist according to the present invention will be described with reference to FIGS. 4, 5, and 6.

Here, FIG. 4 is an exploded cross-sectional view of a main part of an electric chain hoist according to an embodiment of the present invention, and FIG.
FIG. 6 is an exploded view showing the outline of the main body structure, and is a developed perspective view thereof.

In the figure, the same symbols as in Figure 1 indicate the same parts, 28 is the housing, 29 is the gear case.
(1), 30, and 31 are main frames made of steel plates, 32 is a gear case (2), 33 is a screw, 34 is a bolt, and 35 is a bearing.

28a and 29a are main frames 3 formed in the housing 28 and gear case (1) 29, respectively.
This is a recess related to an engagement recess for attaching 0.0, 31.

In FIG. 4, the push button switch 21 and lower hook 19, which are the same as those in FIG. 1, are omitted or shown only briefly.

That is, the electric motor 2 related to the drive source is housed in a housing 28, and the housing 28 is provided with a flat surface shown in FIG. 6 and a recess 28a into which the main frame 30 is attached. The main frame 30 engages with the recess 28a and is attached to the housing 28 with screws 33.

On the other hand, the gear case 29 is provided with a similar recess 29a at a position facing the housing 28, and the other main frame 31 is attached in the same manner as described above, and the surface shape of this is almost symmetrical to that of the housing 28. It has a unique shape.

In the main frames 30 and 31, there is a load sheave 1.
A hole for a bearing 35 for supporting the upper hook 7 and a hole for supporting the upper hook 1 are provided, so that the load thereof is directly borne.

It should be noted that the gear case may not be divided into parts, but may instead be used to store only the gears, with a lid placed on it and electrical components attached to the outside. Gear cases (1) 29, (2) 3 due to the need for lubricating oil seals.
The gear case (2) 32 is equipped with the brake 7 described in the prior art example, a brake corresponding to the electromagnetic switch 12, and electrical components including the electromagnetic switch.

Therefore, gear case (1) 29 and housing 28
are joined together by several bolts 34 to form the main body of the chain hoist.

4, the illustration of the coupling that transmits the rotation of the electric motor 2 to the reduction gear group in the gear case (1) 29, which has the same configuration as in FIG. 1, is omitted. This is provided with a coupling that passes through the flat surface of the gear case (1) 29 on the right side of Fig. 6, through which the rotation of the electric motor 2 is transmitted to the reduction gear group. It is.

Further, the gear cases (1) 29, (2) 32 and the housing 28 are manufactured by casting aluminum or the like which can be formed into any shape.

With the above configuration, the electric motor 2 and the brake in the gear case (2) 32 are energized by operating the push button switch, and the electric motor 2 rotates at the same time as the brake is released, as described in the conventional example in FIG. ,
The rotation is transmitted through the coupling ring to the gear case (1).
The transmission is transmitted to the first-stage pinion in 29, and finally to the load sheave 17 through several stages of reduction gear train, and its rotation causes the link chain 15 to be wound, and the lower hook 19 at its lower end is transmitted to the load sheave 17. It moves up and down.

As described above, the main body structure including the main frame of the electric chain hoist according to the present embodiment is divided into two parts near the center of the load sheave 17 and is joined to the housing 28 and the gear case.
That is, main frames 30 and 31 that support parts that directly bear the load, such as the upper hook 1 and the load sheave 17, are attached to the recess 28a of the housing 28 and the recess 29a of the gear case (1) 29 in the gear case. be.

That is, two main frames 30 and 31 made of steel plates are attached to the inside of the housing 28 housing the electric motor 2 and the gear case, which are molded by casting.
The load sheave 17 is supported between these two steel plate main frames 30 and 31, and the main frame 30,
In a chain hoist in which the upper hook 1 is supported between 31 and 31 to form a main body, the housing 28 in the main body and the gear case including the gear case (1) 29 are divided into two parts near the center of the load sheave 17 and joined. In addition to forming the
Recesses 28a and 29a, which are vertically open engaging recesses, are located inside the housing 28 and the gear case (1) 29 and on the side of the rotating shaft of the electric motor 2, that is, on the left side as shown in FIG. Main frames 30 and 31 made of steel plates having a width narrower than the width of the housing 28 and the gear case (1) 29 are attached to the recesses 28a and 29a related to the engagement recess.

Therefore, in the above, the tension applied to the link chain 15 is directly applied to the upper hook 1 and the load sheave 17, and it is recommended to use a material with appropriate strength and toughness for the support portion. Desirably, low carbon steel plates are generally used.

As a result of the above, the following effects can be expected.

(1) Since the main frame can be constructed with a small number of parts, assembly and disassembly can be easily performed.

(2) Since the load sheave can be divided near the center,
Inspection and maintenance of the chain winding section such as the load sheave, which was difficult in the past, can be easily performed (see Fig. 5).

(3) When assembling the main frames, there is no need to tighten the main frames together with bolts, etc., and parts such as distant pieces to prevent frame deformation are not required.

(4) In order to ensure rainproofness of load sheaves, etc., it is sufficient to cover only a portion between the main frames.

(5) Related to item (3) above, since the main frame does not require bending rigidity, it is possible to make the main frame thinner.

(6) Since the dividing surfaces are made to have the same shape, the shapes on the left and right sides of the dividing surfaces are inevitably the same, and an external shape with less unevenness can be achieved.

(7) In particular, since the electric motor that is the drive source (more specifically, the rotating shaft from the electric motor to the speed reduction mechanism) and both main frames (or load sheaves) made of steel plates are placed side by side in the horizontal direction, Both main frames, which directly bear the load of the upper hook, load sheave, etc., can be simply constructed as separate parts, regardless of the configuration of the housing or gear case, so they can be constructed in a small, narrow space without being buried. It has become possible to make it stand alone, and it can be said that it is the basis for the generation of various effects including this.

(8) In relation to item (2) above, since hoisting machines such as chain hoists are used to transport heavy objects, dropping the load can lead to fatal accidents.
Inspection and maintenance are required by laws and regulations.

In particular, in chain hoists that hoist and lower using electricity or other power, the load sheave and link chain are forcibly engaged, so wear and damage to these parts is more likely than in manual hoists. Well, it's much bigger.

Therefore, inspection of the load sheave is an important matter, and it is a great advantage to configure the chain hoist to facilitate inspection.

〔Effect of the invention〕

According to the present invention, it is possible to provide a chain hoist that is composed of a small number of parts, is easy to disassemble and inspect, and is easy to maintain, and is easy to assemble, and can be said to be a practically excellent invention. .

[Brief explanation of drawings]

FIG. 1 is a partially exploded sectional view of a conventional general electric chain hoist, FIG. 2 is an exploded sectional view of a main part of another conventional electric chain hoist, and FIG. 3 is its main body. FIG. 4 is an exploded view showing the outline of the structure; FIG. 4 is an exploded sectional view of main parts of an electric chain hoist according to an embodiment of the present invention; FIG. 5 is an exploded view showing the outline of the main body structure; FIG. is an exploded perspective view thereof. 1... Upper hook, 2... Electric motor, 5... Coupling, 6... 1st gear pinion, 7... Brake, 8... 2nd gear pinion, 9... 1st gear, 10
...3rd gear pinion, 11...2nd gear, 12...
Electromagnetic switch, 13...3-stage gear, 15...link chain, 17...load sheave, 19...bottom hook, 21...push button switch, 28...housing, 28a...recess, 29...gear case (1 ), 2
9a... recess, 30, 31... main frame, 32... gear case (2), 33... screw, 34... bolt, 3
5...Bearing.

Claims (1)

[Claims] 1. Two main frames made of steel plates are attached to the inside of each of the housing for housing the electric motor and the gear case, which are formed by casting, and the load sheave is supported between these two main frames made of steel plates. In addition, in the chain hoist in which the main body is formed by supporting an upper hook between the main frames, the housing and the gear case in the main body are formed to be divided into two parts near the center of the load sheave and joined together, A vertically open engagement recess is formed inside each of the housing and gear case and on the side of the rotating shaft of the electric motor, and a steel plate main body having a width narrower than the width of the housing and gear case is formed in the engagement recess. A chain hoist characterized by having a frame attached. 2. In what is stated in claim 1,
A chain hoist is a chain hoist that has a gear case that is divided into an inner part that stores gears and an outer part that mounts electrical components, etc.