JP2017095185A - Wheel conveyor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheel conveyor where a container is engaged between wheels, an immovable phenomenon is inhibited and noise and vibration are reduced.SOLUTION: In a wheel conveyor, the engagement of the rib of a container in a valley between wheels by coincidence or approximation with the pitch of the wheels regardless of the rib pitch of the container due to the plurality of combinations and regular alignment of the shaft pitch of the wheel 2 having a prescribed outer diameter is inhibited, and noise and vibration are simultaneously reduced.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a container wheel conveyor that is widely used in the manufacturing industry, distribution and warehousing.

Japanese Patent Publication No. 2012-211017 Patent Publication WO2005 / 070792 Registered Utility Model No. 3041542

As shown in FIG. 1, the conventional wheel conveyor 1 has the wheels 2 arranged on the rails 3 so that the inter-axis distances (hereinafter referred to as the axial pitch) PW of the wheels 2 become equal pitches.
The main usage of this wheel conveyor 1 is described below. Two or three or more wheel conveyors 1 are installed in parallel, and when a transported object such as a return box is loaded on the wheel conveyor 1, it starts to move by its own weight. Stops by colliding with the stopper and the previous transported object at the bottom.
When the transported object at the bottom of the slope is removed, the remaining transported object moves to the front.
The usage is almost.
In rare cases, there is a method of moving the object to be conveyed by pushing it by hand or mechanical force on a wheel conveyor installed horizontally.
Since most of the movement is due to gravity and dead weight, as seen in Patent Document 3, the starting part and the conveying part of the conveyed object have different wheels and shaft pitches so that the conveyed object can be easily started by its own weight. However, the axial pitches within the respective ranges of the starting unit and the conveying unit were equal pitches.

However, on the site where this wheel conveyor is used, resin pass-through boxes (hereinafter referred to as containers) 4 of various manufacturers as shown in FIG. 2 are mixed, and the pitch PR of the reinforcing ribs 5 provided on the bottom surface thereof. There are a variety of things.
For this reason, when the rib pitch PR of the container coincides with the shaft pitch PW of the wheel conveyor, the rib 5 of the container 4 gets stuck in the valley between the wheels 2 and does not move, or operates with noise and vibration. The phenomenon has occurred.

  FIG. 3 shows a conventional countermeasure against the problem described in the previous section. This countermeasure method was a countermeasure for increasing the density of the vertices of the wheel 2 by arranging the wheel 2 in a staggered arrangement.

However, in the case of “rib pitch PR≈integer multiple of shaft pitch PW”, the above-described problem cannot be solved. Therefore, at the site where various rib pitch PR containers 4 coexist, the current situation is that the above-mentioned problem cannot be eliminated.

  In the present invention, in the field where containers of various large and small rib pitches coexist, the ribs of the container get stuck in the valleys between the wheels of the installed wheel conveyor, the container does not move, or vibration and noise occur. The problem is to solve this problem.

In order to solve the above-described problems, the present invention provides a wheel conveyor in which a plurality of wheels are rotatably supported on a rail, and a pitch between the rotation axes of the wheels is a first pitch (A) and a second pitch. (B) two types, the second pitch is larger than the first pitch,
The pitch arrangement is such that the first pitch (A), the first pitch (A), and the second pitch (B) are repeated, and the ratio of the first pitch to the second pitch (B / A) ) Is a wheel conveyor that satisfies any of the following (1) to (5).
(1) 1.226 or more and less than 1.248 (2) 1.277 or more and less than 1.350 (3) 1.372 or more and less than 1.701
(4) 1.723 or more and less than 1.752 (5) 1.774 or more and less than 1.825

  According to the present invention, a single type of wheel conveyor can be used in common for containers of various rib pitches, and noise and vibration can be suppressed.

The ratio (B / A) between the first pitch and the second pitch is preferably 1.372 or more and less than 1.701. This is because the above-mentioned problems can be surely solved even if the shaft pitch changes due to rattling due to molding / assembly tolerances, errors or wear.

Conventional standard wheel conveyor example Typical shape of container with ribs on the bottom Other conventional standard wheel conveyor examples Examples of the present invention Other embodiments of the invention Illustration of simulation judgment conditions Diagram showing container in good condition on simulation The figure which shows the state where the rib got stuck in the simulation The figure which shows the other state where the rib got stuck on the simulation Figure showing a further state where only the front end rib is inserted in the simulation. Third embodiment of the present invention

  The wheel conveyor 1 according to the first embodiment shown in FIG. 4 includes a plurality of wheels 2 having an outer diameter D in a staggered arrangement on a rail 3 having a U-shaped cross section, a first axial pitch A and a first axial pitch. A, the arrangement is such that the second axial pitch B is larger than the first axial pitch A.

  Here, the present inventor simulated whether or not the above-described problems occur when the shaft pitches A and B and the wheel outer diameter D are variously changed. The simulation conditions are as follows.

(Condition 1)
The rib pitch PR of the container was 10 to 50 mm and was changed in units of 1 mm. The rib thickness is 2 mm, the rib height is 5 mm, and the number of ribs is 11. This condition is obtained by investigating a resin container that is actually used. In particular, the rib pitch is presumed to be due to the strength of the material used (mostly polypropylene), but no rib pitch of 50 mm or more was found.

(Condition 2)
The first short axis pitch A of the wheel conveyor is two types of 17 mm and 23 mm. Long shaft pitch is 20mm to 46mm. Wheel outer diameter D is 28 mm to 33 mm and 39 mm to 44 mm. Here, in one wheel conveyor, A, B, and D have the same dimensions. It should be noted that even if the dimensions A, B, and D are enlarged / reduced by a predetermined magnification, the simulation results do not change unless 2A + B is 50 mm or less, which is the maximum rib pitch.

(Condition 3)
The case where the wheel conveyor set in condition 2 is inclined 3 degrees, and the container having various rib pitches in condition 1 moves in 1 mm increments above it is simulated, and any container does not get stuck. “O”, and “X” when the jam phenomenon occurred in any container. Whether or not the jamming phenomenon has occurred is determined at the position of the “contact start point” where the front and rear ribs of the container contact the wheel in the traveling direction, as shown in FIG. When the contact position of both ribs was within 30 degrees from the “apex of 3 degrees of inclination”, it was determined that there was no jamming phenomenon, and a symbol “◯” was attached in Table 1.
When both ribs were at 30 degrees or more, it was judged that there was an inset phenomenon, and a symbol “x” was given in Table 1.
The case where a contact start point of 30 ° or more occurs on either the front end or the rear end is marked with “Δ”. In this Δ-determined container, while moving, the front end or the rear end moves up and down to generate noise and vibration.

The simulation results are shown in Table 1.
FIG. 7 is a schematic diagram showing a state of a container that is determined to be representative of “no jamming phenomenon” appearing on the simulation. FIG. 8 and FIG. 9 are schematic diagrams showing the state of the container determined as “there is a phenomenon of jamming”.
FIG. 10 is a schematic diagram when the rib at either the front end or the rear end has a contact point of 30 degrees or more, which is the state of the container for Δ determination.

From Table 1, the ratio (B / A) between the first pitch and the second pitch is 1.226 or more and less than 1.248, or 1.277 or more and less than 1.350, or 1.372 or more and 1.701. It is understood that the entanglement phenomenon is eliminated when it is less than or less than 1.723 and less than 1.752, or greater than 1.774 and less than 1.825.
And even if there is a change in shaft pitch due to shading due to molding / assembly tolerances, errors, wear, etc., if the B / A is in the range of 1.372 or more and less than 1.701, the phenomenon of stable fitting is eliminated. it can.

FIG. 5 shows a second embodiment. In this example, the wheel 2 is arranged on the inner side of the U-shaped rail 3 in the previous example, but in this example, the wheel 2 is arranged on the outer side. Although there is a drawback that the load on the shaft is cantilevered, the interference between the wheel 2 adjacent to the shaft is eliminated, so that the outer diameter D of the wheel 2 can be increased, and the phenomenon of being stuck can be made difficult to occur.

FIG. 11 shows a third embodiment. In this example, the rail is composed of a bearing 31 and a frame 32. A pair of bearings 31, 31 supports three wheels 2 arranged at an axial pitch A, and this assembly 6 is configured. The assembly 6 is inserted into the bearing support portion 33 of the long frame 32 and the assemblies 6 are arranged in parallel, thereby realizing an axial pitch B between the adjacent assemblies 6 '. The axial pitch B may be realized inside the assembly 6 and the axial pitch A may be realized between adjacent assemblies.

1 Wheel conveyor
2 wheel
3 rails
4 Container 5 Rib PR Rib pitch PW Axial pitch D Wheel outer diameter

In order to solve the above problems, the present invention is a wheel conveyor in which a resin container having a reinforcing rib on the bottom surface is conveyed, and a wheel conveyor in which a plurality of wheels are rotatably supported on a rail, the wheel There are two types of pitches between the rotation axes of the first pitch (A) and the second pitch (B), the second pitch is larger than the first pitch, and the pitch arrangement is the first pitch (A). ), The first pitch (A), and the second pitch (B) are repeated, and the ratio (B / A) of the first pitch to the second pitch is the following (1) to ( 5) , the ratio (D / A) of the first pitch (A) and the outer diameter (D) of the wheel is 1.64 or more and less than 1.95, and the plurality of wheels are: also summarized as wheel conveyor which is arranged in a zigzag pattern to one of said rails It is.
(1) 1.226 or more and less than 1.248 (2) 1.277 or more and less than 1.350 (3) 1.372 or more and less than 1.701 (4) 1.723 or more and less than 1.752 (5 ) 1.774 or more and less than 1.825

Claims (7)

A wheel conveyor in which a plurality of wheels are rotatably supported on a rail,
There are two types of pitches between the rotating shafts of the wheel, the first pitch (A) and the second pitch (B), and the second pitch is larger than the first pitch,
And the arrangement of the pitch, the first pitch (A), the first pitch (A), the second pitch (B) is repeated,
A wheel conveyor in which a ratio (B / A) between the first pitch and the second pitch satisfies any of the following (1) to (4).
(1) 1.226 or more and less than 1.248 (2) 1.277 or more and less than 1.350 (3) 1.372 or more and less than 1.701
(4) 1.723 or more and less than 1.752 (5) 1.774 or more and less than 1.825 In the wheel conveyor of Claim 1,
A wheel conveyor, wherein a ratio (B / A) between the first pitch and the second pitch is 1.372 or more and less than 1.701. The wheel conveyor according to claim 1 or 2, wherein the outer diameters of the plurality of wheels are all equal. The wheel conveyor according to claim 3, wherein a ratio (D / A) of the first pitch (A) and the outer diameter (D) of the wheel is 1.64 or more and less than 1.95. 5. The wheel conveyor according to claim 4, wherein the plurality of wheels are arranged in a staggered manner on one rail. 6. The wheel conveyor according to claim 3, wherein an outer diameter (D) of the plurality of wheels is 20 mm or more and less than 50 mm. A bearing part for a wheel conveyor according to claim 1, wherein the rail and the bearing part are separate parts.

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