JPH0977489A - Explosionproof industrial vehicle and explosionproof type accelerator unit therefor plus explosionproof type controller unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lighten the extent of operating force in an accelerator lever and to prevent the structure of an accelerator unit from being restricted by the setup position of a controller unit. SOLUTION: An accelerator unit equipped with an input shaft 19 connected to an accelerator lever 11, a detector such as a potentiometer and microswitch, etc., detecting a turning position of this input shaft 19, and a cabtire cable 13 for outputting a detection signal of the detector, is housed in a explosionproof vessel 4 in a state of being partially extended, whereby a explosionproof type accelerator unit 12 is constituted. In brief, the accelerator unit is housed in another explosionproof vessel 4 separate from a controller unit. Therefore, the input shaft 19 is always installable in the specified position as free from any restriction of a setup position of the controller unit, and thus a shank 11a of the accelerator lever 11 is directly connected to the input shaft 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an explosion-proof industrial vehicle equipped with an accelerator unit for electrically detecting the operation amount of an accelerator lever mounted on an explosion-proof industrial vehicle such as an explosion-proof forklift, and a pressure resistance for the explosion-proof industrial vehicle. The present invention relates to an explosion-proof accelerator unit and a pressure-resistant explosion-proof controller unit.

[0002]

2. Description of the Related Art Explosion-proof forklifts are used for transportation work in chemical factories that handle combustible gases. In this explosion-proof forklift, the DC motor, controller, etc. that generate electric sparks are housed in a pressure-proof explosion-proof container. Further, an electric system unit (a group of functional parts) that does not generate electric sparks in normal use is also housed in a pressure-resistant explosion-proof container because it may be damaged during use for many years and electric sparks may be generated.

For example, when the explosion-proof forklift is equipped with an accelerator lever, the accelerator unit for detecting the tilt angle of the accelerator lever is also an electric system unit equipped with a potentiometer, a wiring cable and the like, and is therefore housed in a pressure-proof container.

Conventionally, as shown in FIGS. 7 to 9, the accelerator unit 51 has been housed together with the controller unit 52 in one pressure and explosion-proof container 53. This requires only one pressure-resistant explosion-proof container 53 for accommodating the accelerator unit 51 and the controller unit 52, and each unit 5
This is because the wiring between 1 and 52 can be shortened.

The controller unit 52 is relatively large, and the pressure-resistant explosion-proof container 53 in which the accelerator unit 51 and the accelerator unit 51 are housed is relatively large in size, so that its location is necessarily limited. Conventionally, this pressure-proof explosion-proof container 53
As shown in FIG. 6, in the explosion-proof forklift 54, it was disposed in a horizontally long position over a substantially entire width of the vehicle at a position slightly below the instrument panel 57 equipped with the accelerator lever 55 and the cargo handling lever 56. As shown in FIG. 6, the position of the accelerator lever 55 is almost fixed to a predetermined position on the instrument panel 57 which is easy for the driver to operate. Therefore, the accelerator lever 55 can be arranged at the predetermined position as shown in FIG. As shown in FIG. 9, a plurality of (three in FIG. 7 to FIG. 9) links 59 are connected to the end of the input shaft 58 protruding from the explosion-proof container 53.

Further, there is also an explosion-proof forklift 54 in which the layout inside the pressure-proof explosion-proof container is changed and the pressure-proof explosion-proof container is vertically arranged in the left half of the vehicle width below the instrument panel 57, but in this case, a plurality of links 59 are provided horizontally. The input shaft 58 and the accelerator lever 55 are connected by extending in the direction.

[0007]

However, when a plurality of links 59 are interposed between the accelerator lever 55 and the input shaft 58, sliding friction at each connecting portion of the plurality of links 59 results. There is a problem that the operating force of the accelerator lever 55 becomes heavy.

Further, the explosion-proof forklift truck 54 is usually manufactured by a design change to make the electric system unit explosion-proof based on a standard specification vehicle of the forklift truck. However, if the accelerator unit 51, which was arranged directly below the accelerator lever 55 in the standard specification vehicle, is housed together with the controller unit 52 in one pressure-proof explosion-proof container 53, the installation space for the controller unit prepared in the standard specification vehicle becomes available. There is a problem in that the pressure-proof explosion-proof container 53 does not fit and the layout has to be changed.

Furthermore, due to the special specifications and model changes of the explosion-proof forklift 54, it is necessary to change the layout of the pressure-proof explosion-proof container 53 and the input shaft 58 and the accelerator lever 5.
When the relative positional relationship with the No. 5 is forced to change, there is a problem that the design changes such as the number of the links 59 connecting the five and the connecting route thereof are forced. Further, since the layout of the controller unit 52 differs between different models, it is necessary to design a link 59 connecting the accelerator lever 55 and the input shaft 58 for each model in order to make the vehicle explosion-proof. That is, it is difficult to divert the accelerator unit 51 including the accelerator lever 55 between different models.

The present invention has been made to solve the above problems, and its object is to make the operation force of the accelerator lever relatively light and to make the structure of the accelerator unit at the position where the controller unit is arranged. An object of the present invention is to provide an explosion-proof industrial vehicle, a pressure-resistant explosion-proof accelerator unit and an explosion-proof controller unit for an explosion-proof industrial vehicle that are not restricted.

[0011]

In order to solve the above problems, according to the invention of claim 1, in an explosion-proof industrial vehicle,
An accelerator unit for detecting the operation amount of the accelerator lever and a controller unit were housed in separate pressure-proof explosion-proof containers.

According to the second aspect of the present invention, in the flameproof explosion-proof accelerator unit, the accelerator unit is housed in a flameproof container that is separate from the flameproof container in which the controller unit is housed.

According to a third aspect of the present invention, in the flameproof explosion-proof controller unit, the controller unit is housed in a flameproof explosion-proof container separate from the flameproof explosion-proof container housing the accelerator unit according to the first aspect.

According to another aspect of the invention, the base end portion of the accelerator lever is directly connected to the protruding end portion of the input shaft rotatably inserted into and supported by the pressure and explosion proof container from the pressure and explosion proof container. .

According to a fifth aspect of the present invention, an explosion-proof industrial vehicle is equipped with the flameproof explosion-proof accelerator unit according to the second or fourth aspect. Therefore, according to the invention described in claim 1, in the explosion-proof industrial vehicle, the accelerator unit for detecting the operation amount of the accelerator lever is housed in the pressure-proof explosion-proof container separate from the controller unit. The connection structure with the lever does not have to be restricted by the arrangement position of the controller unit.

According to the invention described in claims 2 and 5, it is possible to provide the accelerator unit in the explosion-proof industrial vehicle in a state where the accelerator unit is housed in a pressure-proof explosion-proof container separate from the pressure-proof explosion-proof container housing the controller unit. Becomes

According to the third aspect of the invention, the controller unit can be provided in the explosion-proof industrial vehicle in a state of being housed in a pressure-proof explosion-proof container separate from the pressure-proof explosion-proof container in which the accelerator unit is housed.

According to the inventions of claims 4 and 5, the base end of the accelerator lever is directly connected to the protruding end of the input shaft from the explosion-proof container, and a connecting member such as a link is interposed. Since the sliding friction at the time of the operation is smaller than that of the connecting structure described above, it is possible to relatively reduce the operation force of the accelerator lever.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a flameproof and explosion-proof accelerator unit embodying the present invention will be described with reference to FIGS.

As shown in FIGS. 4 and 5, the explosion-proof forklift 1 as an explosion-proof industrial vehicle is based on a reach type forklift. In this embodiment, the accelerator unit 2 (shown in FIGS. 2 and 3) is pressure-resistant. The explosion-proof container 4 and the controller unit 3 are separately housed in the pressure-resistant explosion-proof container 5. The driver's cab 6 of the explosion-proof forklift 1 is provided with a steering wheel 7, a lumbar support pad 8 and an instrument panel 9, and three cargo handling levers 10 and one accelerator lever 11 are mounted on the instrument panel 9, respectively. Has been done.

An accelerator unit 2 capable of detecting the operation amount of the accelerator lever 11 is housed in a flameproof explosion-proof container 4.
The explosion-proof explosion-proof accelerator unit 12 shown in FIG. 3 is arranged immediately below the mounting position of the accelerator lever 11 with respect to the instrument panel 9 of the operator's cab 6. The explosion-proof container 5 that accommodates the controller unit 3 is horizontally arranged so as to occupy substantially the left half area of the vehicle width diagonally below the instrument panel 9. In the installation space for the accelerator unit and the installation space for the controller unit set in the standard specification vehicle that is the base of the explosion-proof forklift 1, the explosion-proof explosion-proof accelerator unit 1 is installed.
2 and the flameproof container 5 are arranged respectively. A cabtire cable 13 extending from the flameproof explosion-proof accelerator unit 12 is connected to the controller unit 3 in the flameproof explosion-proof container 5.

Next, the structure of the flameproof explosion-proof accelerator unit 12 will be described. As shown in FIGS. 1 to 3, the flameproof explosion-proof container 4 constituting the flameproof explosion-proof accelerator unit 12.
Is composed of a pressure-resistant container base 14 and a pressure-resistant container cover 15, and has four (4 in FIG.
The pressure-resistant container base 14 and the pressure-resistant container cover 15 are fixed to each other by a bolt 16 (only a book is shown) so as to form a closed container. Both the pressure-resistant container base 14 and the pressure-resistant container cover 15 are made of cast iron, and have strength enough to withstand an explosion in the pressure-resistant explosion-proof container 4. At the four corners of the surface of the pressure-resistant container base 14, there are formed thickening projections 17 for fastening the bolts 16.

A boss portion 18 is formed substantially at the center of the pressure resistant container base 14. Shaft part 11 of accelerator lever 11
The plate-shaped base of a has a pipe-shaped input shaft 19
Are fixed by welding so as to extend vertically, and the input shaft 19 is provided with a boss portion 18 via a substantially cylindrical collar 20.
Is rotatably inserted and supported in the through hole 18a. The collar 20 is an oilless collar and is made of a sintered metal impregnated with oil.

An insertion hole 11b communicating with the inside of the cylinder of the input shaft 19 is formed at the base of the shaft 11a, and the support plate 21 is formed.
The support plate is fixed to the shaft portion 1a by fastening two bolts 22 in a state in which the rod 21a protrudingly provided in the insertion hole 11b is inserted. By inserting the rod 21a into the cylinder of the input shaft 19, a "ski" in the flameproof structure is formed, and escape of the flame from the cylinder of the input shaft 19 is prevented.

As shown in FIG. 2, a support shaft 23 is fastened and fixed to the surface of the pressure-resistant container base 14 below the boss 18 in a protruding state. In addition, the shaft portion 1 of the accelerator lever 11
A latch shaft 24 is provided at the lower end of 1a so as to extend parallel to the support shaft 23. Spring 2 on the boss 18
As shown in FIG. 2, both ends of the spring 25 are engaged with the support shaft 23 and the latch shaft 24 so as to cross each other in opposite directions. That is, the accelerator lever 11 is urged by the elastic force of the spring 25 so as to return to the neutral position shown in FIG.

A regulation portion 26 and a block portion 27 for fixing the cabtire cable 13 are formed on the surface of the pressure-resistant container base 14 so as to project in front of and behind the accelerator lever 11 in the neutral position in the direction of rotation thereof. Has been done. The accelerator lever 11 comes into contact with the restricting surface 26a of the restricting portion 26 and the restricting surface 27a of the block portion 27 so that the rotation range of the accelerator lever 11 is restricted from the neutral position to about 45 degrees in the front-rear direction.

As shown in FIGS. 2 and 3, a potentiometer 28 is provided at a position opposite to the end of the input shaft 19 opposite to the accelerator lever 11, and the input shaft 28 is provided with the potentiometer 28.
a is inserted into the cylinder of the input shaft 19 and the input shaft 1
It is fixed by a fixing screw (not shown) so as to be rotatable integrally with the member 9. With this potentiometer 28, the input shaft 19
Is detected, that is, the operation amount from the neutral position of the accelerator lever 11 is detected.

As shown in FIGS. 2 and 3, the input shaft 1
A cam 29 is integrally rotatably fitted to the cam 9, and the detecting portions 30a, 31a, 31a, 31a,
A total of four microswitches 30, 31, 32, 33 are provided, two on the front and two on the rear with 32a and 33a facing each other. When the accelerator lever 11 is in the neutral position, the micro switches 30 to 33 detect the detection units 30a to 33a.
Does not engage with the cam 29, and the micro switches 30 to 33 are turned off. When the accelerator lever 11 is tilted from the neutral position to the front side (upper side in FIG. 3), the cam 29 causes the detecting portion 32 to move.
a, 33a are pressed to turn on the micro switches 32, 33, and the accelerator lever 11 is moved from the neutral position to the rear side (see FIG.
When it is tilted to the lower side in FIG.
By pressing a and 31a, the microswitches 30 and 31 are turned on.

The potentiometer 28 and the micro switches 30 to 33 are the core wire 13a of the cabtire cable 13.
Connected to the potentiometer 2 (shown in FIG. 3)
8 and the detection signals of the micro switches 30 to 33 are transmitted via the cabtire cable 13 to the controller unit 3
It is designed to be output to. A pair of front and rear micro switches 30, 32 is used to detect the operation direction of the accelerator lever 11. The pair of front and rear microswitches 31 and 33 is appropriately used for any purpose, for example, a backlight that is turned on when the vehicle is back, a back buzzer that is operated when the vehicle is back, or a forward and backward chime that is operated when the vehicle is traveling forward or backward. -Used for off control.
Incidentally, the potentiometer 28 and the micro switch 30-
33 is a pressure-resistant container base 1 via a bracket (not shown)
It is fixed to the inner surface of No. 4.

The cabtire cable 13 is attached to the pressure resistant container base 14 by a so-called pressure resistant packing structure. That is, the cabtire cable 13 is inserted into the rubber packing 34 fitted in the cylinder of the block 27 having a substantially rectangular tube shape and is inserted into the insertion hole 14 a formed in the pressure vessel base 14. Then, the support member 35
Is fixed to the pressure-resistant container base 14 by fastening and fixing the packing 34 to the block portion 27 while pressing the packing 34 with the two bolts 36. This pressure-resistant packing structure also prevents the escape of the flame when the flammable gas in the pressure-proof explosion-proof container 4 is ignited.

On one side portion (lower side portion in FIG. 3) of the pressure-resistant container cover 15, two thick-walled portions 37, 38 extending in the depth direction of the pressure-resistant container cover 15 are projectingly extended. Two bolt holes 37a are provided in the thick portion 37
One bolt hole 38a is formed in each of the holes 8. The flameproof explosion-proof accelerator unit 12 has three bolts 39 at predetermined positions shown in FIG.
It is fastened and fixed to the frame 1a via a and 38a.

When the micro switch 30 is turned on, the controller (not shown) constituting the controller unit 3 is for traveling at a rotational speed corresponding to the detection signal from the potentiometer 28 which is proportional to the operation amount of the accelerator lever 11 at that time. A motor (not shown) is normally driven. When the micro switch 32 is turned on, the traveling motor (not shown) is reversely driven at a rotation speed corresponding to the detection signal from the potentiometer 28 which is proportional to the operation amount of the accelerator lever 11 at that time. Explosion-proof forklift 1
The forward drive is performed by the forward drive of the traveling motor, and the reverse drive is performed by the reverse drive of the traveling motor.
Further, when the microswitches 31 and 33 are turned on, the controller performs predetermined operation control such as lighting of a backlight and operation of a back buzzer or a forward / backward chime.

Next, the operation of the flameproof explosion-proof accelerator unit 12 will be described. Normally, the accelerator lever 11 is biased by the spring 25 and is arranged at the neutral position. When the accelerator lever 11 is tilted forward, the explosion-proof forklift 1 travels forward at a speed corresponding to the tilt angle (operation amount), and at this time, for example, a forward chime is sounded. When the accelerator lever 11 is tilted backward, the explosion-proof forklift 1 travels backward at a speed according to the tilt angle (operation amount), and at this time, for example, the backlight is turned on or the back buzzer or the reverse chime is sounded.

A flammable gas is generated in a chemical factory or the like where the explosion-proof forklift 1 is operated, and the flammable gas that has entered the pressure-resistant explosion-proof container 4 is supplied with electric parts such as a potentiometer 28 and micro switches 30 to 33 as an ignition source. Even if an ignition occurs and an explosion occurs, the strength of the pressure-resistant explosion-proof container 4 withstands the explosion, and the "ski" formed in the penetrating portion of the input shaft 19 and the pressure-resistant packing structure of the mounting portion of the cabtire cable 13. Prevents the escape of flames.

The flameproof explosion-proof accelerator unit 12 has the structure in which the accelerator unit 2 is housed alone in the flameproof container 4 and is independent of the flameproof container 5 containing the controller unit 3. As described in the related art, the arrangement position of the controller unit 3 is not restricted.

Therefore, according to the explosion-proof explosion-proof accelerator unit 12, the following effects can be obtained. (A) Since the accelerator unit 2 is separately housed in the flameproof explosion-proof container 4 so that the flameproof explosion-proof accelerator unit 12 is not restricted in the position where the controller unit 3 is arranged, the position where the controller unit 3 is arranged. Regardless of this, the flameproof explosion-proof accelerator unit 12 can always be arranged below the instrument panel 9 corresponding to the mounting position of the accelerator lever 11.

(B) Since the flameproof explosion-proof accelerator unit 12 can be arranged immediately below the instrument panel 9 corresponding to the mounting position of the accelerator lever 11, the shaft portion 11a of the accelerator lever 11 is directly connected to the input shaft 19. be able to. Therefore, the operating force of the accelerator lever 11 can be made lighter than that of the structure having the link described in the related art.

(C) The explosion-proof explosion-proof accelerator unit 12 is arranged in the installation space for the accelerator unit 2 which is prepared just below the accelerator lever 11 in the standard specification vehicle.
Therefore, since the accelerator unit 2 disposed directly below the accelerator lever 11 in the standard specification vehicle as described in the related art is housed together with the controller unit 3 in one pressure and explosion-proof container, the controller unit in the standard specification vehicle is arranged. It is possible to solve the problem that the explosion-proof container cannot fit in the space and the layout has to be changed. In other words, the layout of the accelerator unit 2 and the controller unit 3 in the standard specification vehicle can be maintained as it is even after the explosion protection of the standard specification vehicle of the reach type forklift truck, and a large layout change is not required. Therefore, there are few design changes for explosion protection.

(D) Even if the controller unit 3 (that is, the explosion-proof container 5) is changed in shape or layout due to a special specification or model change of the explosion-proof forklift 1,
Since the flameproof explosion-proof accelerator unit 12 is not restricted at all, only the controller unit 3 side needs to be changed. For example, there is no need to change the design such as changing the number of links of the link 59 or the connecting route thereof as described in the related art.

(E) The layout of the controller unit 3 in the standard specification vehicle differs depending on the model, but since the explosion-proof explosion-proof accelerator unit 12 is not restricted by the installation position of the controller unit 3, the explosion-proof explosion-proof accelerator unit 12 is It can be used in explosion-proof industrial vehicles of different types of accelerator lever type.

(F) In the structure in which the accelerator levers are connected by the links described in the prior art, it is necessary to determine the placement position of the controller unit in consideration of the number of links and the link path, but the link becomes unnecessary. Therefore, the degree of freedom of the arrangement position of the controller unit 3 is increased, and the controller unit 3 can be arranged with the highest accommodation rate.

The present invention is not limited to the above-described embodiment, but may be configured as follows, for example, within the scope of the invention. (1) It is sufficient that at least the forward and backward switches (microswitches 30, 32) are provided as the microswitches, and the number of dispositions is not particularly limited. Further, the application of the micro switch other than the forward / reverse switch is not limited to the above-mentioned embodiment, and can be appropriately used for the application as needed. In this case, the shape of the cam 29 may be changed according to the application to appropriately change the on / off timing of the micro switch.

(2) Controller unit 3 after explosion protection
The layout of may be different from that of the standard specification car. (3) The mounting position of the accelerator lever 11 is not limited to the above-mentioned embodiment, and may be appropriately changed to a position according to the model.
For example, the accelerator lever 11 may be arranged on the left side of the cargo handling lever. Further, the shape of the accelerator lever 11 may be changed appropriately. For example, the shaft portion 11a may be curved or the grip shape may be a fan plate shape.

(4) Instead of the forward / reverse switching type accelerator lever, an accelerator lever having only a speed adjusting function may be used. In this case, the accelerator lever is biased in only one direction so as to be arranged at the original position, and the detection means is only a rotation amount detector such as a potentiometer. A switching means for switching between forward and reverse may be provided separately.

(5) The present invention may be applied to other accelerator lever type industrial vehicles other than the reach type forklift. The invention grasped from the above-mentioned embodiment and not described in the scope of claims is described below together with its effect.

(A) In the invention according to claim 2 or claim 3, the accelerator lever can be rotated forward and backward from a neutral position, and a rotation amount for detecting a rotation amount from the neutral position of the accelerator lever. The detection means and the forward / reverse switching detection means for detecting the operation direction from the neutral position of the accelerator lever are provided. According to this structure, forward / backward movement of the explosion-proof industrial vehicle can be controlled only by rotating the accelerator lever connected to the input shaft.

[0047]

As described above in detail, according to the invention of claim 1, in the explosion-proof industrial vehicle, the accelerator unit for detecting the operation amount of the accelerator lever and the controller unit are provided in separate pressure-proof explosion-proof containers. Since it is housed and installed, the connection structure between the accelerator unit and the accelerator lever can be made unconstrained by the arrangement position of the controller unit. As a result, the accelerator lever can always be directly connected to the accelerator unit irrespective of the position where the controller unit is arranged, so that the operating force of the accelerator lever can be relatively reduced.

According to the second and fifth aspects of the invention, the accelerator unit can be independently installed in the explosion-proof industrial vehicle in a state of being housed in a pressure-proof explosion-proof container separate from the controller unit.

According to the third aspect of the invention, the controller unit can be independently installed in the explosion-proof industrial vehicle in a state of being housed in the pressure-proof explosion-proof container separate from the accelerator unit.

According to the invention described in claims 4 and 5, since the base end portion of the accelerator lever is directly connected to the protruding end portion of the input shaft protruding from the explosion-proof container, the sliding friction at the time of operating the accelerator lever Can be made smaller and the operating force can be made relatively lighter.

[Brief description of drawings]

FIG. 1 is a perspective view of a flameproof explosion-proof accelerator unit.

FIG. 2 is a partially cutaway side view of the same.

FIG. 3 is a partially cutaway plan view of the same.

FIG. 4 is a plan view of the cab of the explosion-proof forklift truck.

FIG. 5 is a partial perspective view of an explosion-proof forklift truck.

FIG. 6 is a partial perspective view of a conventional explosion-proof forklift.

FIG. 7 is a plan view of a conventional device.

FIG. 8 is a front view of the same.

FIG. 9 is a side view of the same.

[Explanation of symbols]

1 ... Explosion-proof forklift as an explosion-proof industrial vehicle, 2 ... Accelerator unit, 3 ... Controller unit, 4 ... Flameproof container, 5 ... Flameproof container, 11 ... Accelerator lever,
12 ... Explosion-proof type accelerator unit, 19 ... Input shaft.

Claims (5)

[Claims] 1. An explosion-proof industrial vehicle in which an accelerator unit for detecting an operation amount of an accelerator lever and a controller unit are housed in separate pressure-proof explosion-proof containers. 2. A flameproof explosion-proof accelerator unit for an explosionproof industrial vehicle, wherein the accelerator unit and the controller unit are housed in separate flameproof containers. 3. A pressure-resistant explosion-proof controller unit for an explosion-proof industrial vehicle, wherein the accelerator unit and the controller unit according to claim 1 are housed in separate pressure-proof explosion-proof containers. 4. The explosion proof according to claim 2, wherein a base end portion of an accelerator lever is directly connected to a protruding end portion of the input shaft rotatably inserted into and supported by the pressure proof explosion proof container from the pressure proof explosion proof container. Explosion-proof explosion-proof accelerator unit for industrial vehicles. 5. An explosion-proof industrial vehicle comprising the pressure-resistant explosion-proof accelerator unit according to claim 2.