JP3743089B2 - Explosion-proof battery forklift - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery forklift having an explosion-proof configuration.
[0002]
[Prior art]
Some forklifts are used in places where the surrounding area is filled with dust or combustible gas. Since the engine car cannot be used in such a place, a battery forklift is used. However, even in a battery forklift, if sparks are scattered in the electrical system, the surrounding dust or gas may ignite and cause an explosion.
[0003]
Therefore, the battery forklift used in such a dangerous place uses a custom-made product configured to prevent explosion.
FIG. 4 is a diagram illustrating a method for storing a controller of a battery forklift that does not have an explosion-proof configuration.
[0004]
The controller 12 controls all of the electric system of the battery forklift. For example, the controller 12 controls electric power steering, a cylinder pump that raises and lowers the mast, and the like.
[0005]
In general, the controller 12 is fitted into a recess 11 provided in the counterweight 10, and a cover 13 is covered from above. The reason why the controller 12 is provided at this position is to allow a person to work on the circuit in a comfortable posture when it is necessary to repair the circuit of the controller 12 for maintenance or the like. When the controller 12 is repaired, the cover 13 is removed so that the controller 12 can be handled from the front of the counterweight 10.
[0006]
In such a configuration, a connection to each part of the forklift is drawn out from the controller 12 provided on the counterweight 10 through the counterweight 10. Although the counterweight 10 is removed at the time of forklift maintenance or the like, the connection connected to the controller 12 must be removed every time the counterweight 10 is removed in the configuration of FIG.
[0007]
The controller 12 has an exposed board on which electronic components are mounted, and there is a gap between the cover 13 and the counterweight 10, so that the periphery of the battery forklift is made of dust or flammable gas. When it is full, there is a risk that flammable gas or the like reaches the controller 12 through this gap and causes an explosion due to a spark.
[0008]
[Problems to be solved by the invention]
As described above, with the conventional arrangement of the controller 12, a gap is formed between the cover 13 and the counterweight 10, so that an explosion-proof effect cannot be obtained.
[0009]
Further, since the controller 12 is attached to the counterweight 10, the connection between the controller 12 and each forklift device must be disconnected every time the counterweight 10 is removed.
[0010]
Alternatively, it is conceivable that the controller 12 is provided at a location different from the counterweight 10. However, the position of the controller 12 becomes low, and the posture of the person maintaining the controller 12 becomes unnatural. 12 becomes difficult to operate.
[0011]
Accordingly, an object of the present invention is to provide a battery forklift having an explosion-proof configuration while maintaining the serviceability that maintenance of a controller is easy.
[0012]
[Means for Solving the Problems]
In the explosion-proof battery forklift of the present invention, the controller is housed in a flameproof case, the flameproof case is mounted on the horizontal part of the frame at the rear of the battery forklift, and the back surface is fixed to the vertical part. .
[0013]
According to such a configuration, the installation position of the explosion-proof case that houses the controller can be made almost the same height as a conventional battery forklift that is not explosion-proof, so that the controller can be easily operated by using the explosion-proof specification. There is no loss of value.
[0014]
In addition, in battery forklifts that are not conventional explosion-proof specifications, because the controller was attached to the counterweight, it was necessary to disconnect the controller each time the counterweight was removed, but by attaching the controller to the frame, It is not necessary to remove the connection, and the work of removing the counterweight is simplified.
[0015]
In addition, the combined weight of the explosion-proof case and controller is about 100kg, which is quite heavy, but by placing the explosion-proof case on the horizontal part of the frame and fixing it on the back, the load on the fixed part on the back is reduced. At the same time, it is relatively easy to install the explosion-proof case.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Before describing the embodiment of the present invention, the overall configuration of the forklift will be described.
[0017]
FIG. 1 is a general overview of a forklift.
The figure (a) is the figure which looked at the forklift from the upper part, and the figure (b) is the figure seen from the side.
[0018]
The forklift is provided with a mast 22 and a fork 23 for lifting and unloading luggage in front of the machine base 24. The fork 23 is inserted into a pallet on which a load is placed, for example, and serves to hold the load. The fork 23 is attached to the inner mast that constitutes the mast 22, and the inner mast moves up and down along the outer mast that also constitutes the mast 22, thereby lifting and lowering the load.
[0019]
Front and rear wheels 26 and 27 are provided in front of and behind the machine base 24, respectively, and are usually rear wheel steering. A seat 25 is provided on the machine base 24, and the driver sits on this portion and operates the forklift.
[0020]
A head guard 21 is provided above the seat 25 and serves to protect the driver when luggage or the like falls from above to the seat 25. A counterweight 20 is provided behind the seat 25 so that when a load is placed on the fork 23, a balance is achieved before and after the machine base.
[0021]
Although not shown in the drawing, a battery is stored under the seat 25 in the case of a battery forklift, and an engine is stored in the case of an engine-type forklift. When considering explosion-proof, the engine type needs to be a battery type because the combustion of fuel in the engine may ignite surrounding gas.
[0022]
In the conventional battery forklift, the controller weight (not shown) is attached by providing a recess in the counterweight 20 as described above. This controller controls the entire electric system of the electric part of the battery forklift, such as electric power steering that allows the handle 28 to be operated lightly, and control of a motor (not shown) that moves the front wheel 26 that is the driving wheel. It is.
[0023]
The pillar 29 supports the head guard 21 behind the seat 25, and the pillar 29 itself is attached to a frame 30 described later provided in front of the counterweight 20.
[0024]
FIG. 2 is a diagram showing a configuration of the present invention in an explosion-proof battery forklift.
The figure (a) is the figure which showed the mode of accommodation of the controller case assembly which has an explosion-proof structure. FIG. 2B is a diagram showing the configuration of the controller case assembly, and FIG. 4C shows the explosion-proof configuration of the connection hole 46.
[0025]
In FIG. 2A, the controller case assembly 31 includes a controller 35 therein. The controller case assembly 31 has an explosion-proof specification, and in this configuration, no gas leaks outside even if an explosion occurs. The controller case assembly 31 is mounted on a horizontal portion of the frame 30 and attached to a vertical portion of the frame 30 provided with a metal flat plate 39 as an attachment member.
[0026]
Each metal flat plate 39 is provided with a hole through which a bolt is inserted. Further, pillars 37 are welded to the frame 30 to support the head guard 21 in FIG.
[0027]
The controller case assembly 31 is placed on the frame 30 and arranged so that the back surface abuts against the metal flat plate 39. And it fixes from the back by the volt | bolt inserted in the hole of the metal flat plate 39. FIG.
[0028]
Next, a counterweight 32 having a hole 38 is attached to a portion corresponding to the controller case assembly 31, and finally a cover 33 for closing the hole 38 provided in the counterweight 32 is attached. By configuring in this way, the explosion-proof specification can be achieved without impairing the appearance of the counterweight 32 portion.
[0029]
The configuration of the controller case assembly 31 is shown in FIG. The controller 35 has the substrate exposed, and there is a possibility of igniting an external gas or the like during operation of the forklift, but this is put in the controller case 34 constituting the explosion-proof case, The controller case assembly 31 is covered with a controller case cover 36 constituting a pressure-proof explosion-proof case, thereby preventing the case. The controller case 34 and the controller case cover 36 are made of iron, for example.
[0030]
In this embodiment, the controller case cover 36 is a plate-shaped iron plate, and is fastened and fixed to the controller case 34 with bolts (not shown). When the controller 35 is inspected for maintenance or the like, first, the cover 33 shown in FIG. 5A is removed, and then the bolts fixing the controller case cover 36 are removed.
[0031]
The controller case 34 is provided with a projecting portion 40, and the connection from the controller 35 is connected to each portion of the forklift through this. The controller case 34 needs to be explosion-proof, and even when an explosion occurs inside the controller case 34 covered with the controller case cover 36, the flame does not leak from the controller case assembly 31. Need to be.
[0032]
Therefore, a device is devised where the connection extending from the controller 35 goes out of the controller case 34.
As shown in FIG. 6C, the controller case 34 has a hole 46 for the connection 41, and the connection is passed through the hole 46. The inner diameter of the hole 46 is reduced by one step on the outer side, and has a large diameter and a small diameter from the inside to the outside. First, the large diameter is fitted with a metal ring 42 having an outer diameter smaller than the larger diameter and larger than the smaller diameter and an inner diameter larger than the outer diameter of the connection. Next, a rubber ring 43 having the same diameter as that described above is fitted, and a protruding portion having the same diameter as that of the metal lid 44 from above is fixed with a bolt 45.
[0033]
The protruding portion of the metal lid 44 presses the rubber ring 43. As a result, the rubber ring 43 is crushed to fill the gap with the connection 41, and even if an explosion occurs inside the controller case 34, it is possible to prevent the flame from leaking from this portion.
[0034]
In addition, it is not limited to the said structure, Any other structure which can seal the drawer | drawing-out part of the connection 41 is applicable.
FIG. 3 is a diagram showing a specific configuration example of the present invention.
[0035]
FIG. 4A is a front view of the controller case assembly portion, in which a part of the controller case cover 36 is removed so that the internal controller 35 can be seen. FIG. 4B is a side sectional view of the controller case assembly portion.
[0036]
As shown in FIG. 2A, the controller 35 is put in a controller case 34, and the controller case cover 36 is fixed by a plurality of bolts 51. In this embodiment, the controller case 34 and the controller case cover 36 are made of iron. However, the controller case 34 and the controller case cover 36 are designed to be in close contact when tightened with a plurality of bolts 51, and an explosion occurs in the controller case 34. Even gas is not leaking. In addition, you may interpose elastic rubber etc. as needed.
[0037]
As described above, the controller case 34 is provided with the protruding portion 40, and the connection is drawn from this portion to each portion of the forklift. The controller case 34 comes into contact with the frame 30 on the back and is fixed with bolts. Further, the controller case 34 is not only fixed to the vertical portion of the frame 30 on its back surface, but also abuts against the frame 30 on the lower surface at the contact portion 52 to support the weight of the controller case assembly including the controller 35. It is like that. Since the weight including the controller case 34, the controller case cover 36 and the controller 35 is as heavy as about 100 kg, it is very difficult to attach the back surface only to the vertical portion (rear plate) of the frame 30. The controller case 34 is placed on the horizontal portion of the frame 30 and the back surface thereof is fixed to the vertical portion (rear plate) of the frame 30 with bolts.
[0038]
In this way, by supporting the weight of the controller assembly by placing it on the horizontal portion of the frame 30, the weight on the bolt supporting the controller assembly on the back surface is reduced, and the load on the bolt can be reduced. . Therefore, the screw thread of the bolt can be prevented from being crushed, and the life of the bolt and the controller case 34 can be extended.
[0039]
In addition, when attaching the controller assembly to the frame 30, it is possible to mount the controller assembly on the horizontal portion of the frame 30 and then attach the back surface thereof to the vertical portion (rear plate) of the frame 30. Can alleviate the burden on those who do it.
[0040]
When removing the controller case cover 36, the cover 33 of the counterweight shown in FIG. 2 is removed, and the bolt 51 holding the controller case cover 36 where the hole 38 provided in the counterweight 22 is exposed is removed. Good.
[0041]
According to such a configuration, since the position when working with respect to the controller 35 comes to a high position, the worker can work while keeping the posture in a natural state. Therefore, the battery forklift can be made explosion-proof without sacrificing good workability for the controller 35 as compared with the case of a conventional battery forklift that is not explosion-proof.
[0042]
Also, it is not necessary to remove the controller connection when removing the weight.
FIG. 2B shows a state in which the controller 35 is inserted into the controller case 34 and is covered with the controller case cover 36. Although not specifically described, a connection is drawn from the protrusion 40 of the controller case 34 and led to each part of the forklift.
[0043]
In FIG. 2B, the controller case 34 is provided above the rear wheel 27 and is fixed to the vertical portion of the frame 30 with bolts 53 with an iron plate 50 as an attachment member interposed therebetween. Of course, the mounting member may have a configuration in which the metal flat plate 39 as described in FIG. 2 is provided at the position of the bolt, or may be a mounting member other than these. Alternatively, it is possible to directly attach the controller case 34 without an attachment member. However, when the same controller case 34 is attached to a forklift of a different vehicle type, the position of the controller case 34 needs to be adjusted. However, it is preferable to provide an attachment member. That is, if the mounting member has a thickness suitable for each model, a controller case having the same thickness can be provided on different types of forklifts regardless of the front and rear positions.
[0044]
【The invention's effect】
An explosion-proof structure can be satisfied without deteriorating the appearance of the counterweight portion of a conventional forklift.
[0045]
In addition, since the controller can be disposed at almost the same location as a conventional battery forklift that is not explosion-proof, the ease of work on the controller is not sacrificed.
[0046]
Furthermore, by attaching the controller to the frame instead of the counterweight, it is not necessary to connect the controller when removing the counterweight, and the work can be simplified.
[Brief description of the drawings]
FIG. 1 is a general overview of a forklift.
FIG. 2 is a diagram showing a configuration of the present invention.
FIG. 3 is a diagram showing a specific configuration example of the present invention.
FIG. 4 is a diagram illustrating a method for storing a controller of a battery forklift that does not have an explosion-proof configuration.
[Explanation of symbols]
10, 20, 32 Counterweight 11 Indentation 12, 35 Controller 13, 33 Cover 21 Head guard 22 Mast 23 Fork 24 Machine base 25 Seat 26 Front wheel 27 Rear wheel 28 Handle 29, 37 Pillar 30 Frame 31 Controller case assembly 34 Controller case 36 Controller case cover 38 Hole 39 Metal flat plate 40 Projection 41 Connection 42 Metal ring 43 Rubber ring 44 Metal lids 45, 51, 53 Bolt 50 Iron plate 52 Contact part

Claims (7)

An explosion-proof battery forklift that uses an explosion-proof configuration for the controller that controls the electrical system,
The controller is housed in a flameproof explosion-proof case, the flameproof explosion-proof case is mounted on the horizontal part of the frame at the rear of the battery forklift, the back is fixed to the vertical part , and the connection from the controller is provided at the rear of the battery forklift An explosion-proof battery forklift that is wired so as not to penetrate the counterweight . 2. The explosion-proof battery forklift according to claim 1, wherein a hole is formed in a counterweight provided at a rear portion of the battery forklift corresponding to a position where the explosion-proof case that houses the controller is provided. . The hole provided in the counterweight is configured so that an operator can open the explosion-proof case and expose the explosion-proof case from the hole when working on the controller inside. The explosion-proof battery forklift according to claim 2, wherein the explosion-proof battery forklift is provided. The explosion-proof battery forklift according to claim 2, wherein a cover is attached to the hole during normal use of the explosion-proof battery forklift. 2. The explosion-proof battery forklift according to claim 1, wherein the explosion-proof case is made of iron, and a plate-shaped iron plate is fastened with bolts on a front surface of the explosion-proof case. The explosion-proof case is provided with a hole through which the connection from the controller is drawn, and an elastic ring is fitted into the hole, and pressure is applied to the elastic ring to connect the hole and the connection. The explosion-proof battery forklift according to claim 1, wherein a space between them is filled to obtain a pressure-proof explosion-proof action. The vertical part of the frame at the rear part of the explosion-proof battery forklift is provided with a mounting member having a thickness suitable for each model, and the pressure-proof explosion-proof case is attached to the vertical part via the mounting member. The explosion-proof battery forklift according to claim 1.

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