JPH04107167U - Carrier with a pair of separate drive wheels - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a carrier that can pass through the curved portion of the rail at approximately the same speed regardless of whether it curves in the left or right direction. [Configuration] The carrier includes a pair of drive means for separately rotating a pair of drive wheels that rotate separately on a pair of rails, and a pair of drive means for separately rotating a pair of drive wheels when the drive wheels run on a curved portion of the rail. The vehicle has a traveling speed control means for controlling the driving wheels to create a difference in traveling speed between the driving wheels running on the outside and the driving wheels running on the inside. When the carrier approaches a curved portion of the rail, the running speed control means controls the drive means corresponding to each drive wheel so that the drive wheels running on the outside of the curve run faster and the drive wheels running on the inside run slower. sends a control signal to This allows the carrier to pass through the curved portion at a substantially constant speed regardless of the direction in which the curve curves.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a carrier with a pair of drive wheels that are driven and rotated separately.

0002

[Conventional technology]

Conventionally, a carrier 10 (see Fig. 5) that carries a workpiece and runs on a pair of rails R, R is used. ) are a pair of front and rear running wheels 11, 12, 13 running on each rail R, R. , 14. These front and rear running wheels 11, 12, 13, and 14 are all individual. For example, one of the front running wheels 11 and 12 rotates separately. The running wheel 11 is a driving wheel to which a driving force of a driving means (for example, a motor, not shown) is applied. Alternatively, the two running wheels 11 and 13 on one side are used as driving wheels.

0003

[Problem that the idea aims to solve]

However, in the case of a carrier with one running wheel 11 as the driving wheel, the rail car When driving on a curved section, the problem that the traveling speed differs depending on the direction of the curve has been solved. have. In other words, in a curved part, a pair of rails has a curved area where the inner rail is larger than the outer rail of the curve. The rail will be shorter. For this reason, if the rail curves on the opposite side of the drive wheel, (The state shown in FIG. 5), the drive wheels run on a long rail. On the other hand, the rail is If the car curves towards the driving wheels, the driving wheels will run on a short rail. this The carrier runs on the part where the rail curves away from the drive wheels. The driving speed is faster when driving around a curved area toward the drive wheels than when driving around a curved area toward the drive wheels. is delayed. In addition, in the case of a carrier with two drive wheels, in addition to the problems mentioned above, When the front drive wheels enter or exit a curve, the front , the speed difference between the rear drive wheels causes them to push or pull against each other, reducing the driving force. The problem is that a part of the data is lost.

0004

[Means to solve the problem]

This invention rotates a pair of drive wheels that rotate separately on a pair of rails. a pair of drive means for causing the drive wheels to move when the drive wheels travel along a curved portion of the rail; A pair of drive means are controlled separately, and a drive wheel runs on the outside and a drive wheel runs on the inside. The carrier has a traveling speed control means that creates a difference in traveling speed between the front and rear wheels. This solution solves the problems described below.

[0005]

[Effect]

The carrier runs on a pair of rails by a pair of drive wheels. The carrier is When the vehicle approaches a curved portion of the road, the traveling speed control means causes the vehicle to travel on the outside of the curve. Each drive wheel is set so that the drive wheel runs faster and the inner drive wheel runs slower. A control signal is sent to the corresponding drive means. This allows the carrier to move at a nearly constant speed regardless of the direction of the curve. Pass through the curve.

[0006]

【Example】

Hereinafter, embodiments of the present invention will be described based on the drawings. The carrier 20 is used, for example, in an automobile production line, and is The car 21 and the driven car 22 are connected by a connecting bar 23, and the work Load the workpiece W onto the workpiece loading platform 24 (see Figure 2) and connect it to the pair of rails R, R (see Figure 1). ) is designed to run on top. Further, this carrier 20 is a workpiece loading platform 24. The rest are located under floor F.

[0007] The drive wheel 21 includes two drive wheels 30 and 31 (see FIG. 1) that rotate separately, and It has two drive motors 32 and 33 that rotate two drive wheels 30 and 31 separately. ing. One drive wheel 31 runs by guide rollers 34, 34, 34, 34. You will be guided. A control box 35 is installed on the side of the driving vehicle 21. (See FIG. 2) is provided. Inside the control box 35, there is a cap that will be described later. A rear speed control means (travel speed control means) 60 is provided. moreover The drive vehicle 21 is a signal cable laid on the outer side of the left rail R in FIG. It has contacts 37, 37 that come into contact with 36, 36.

[0008] The driven vehicle 22 has two driven wheels 40 and 41 that rotate separately. one side The driven wheel 41 is guided by guide rollers 42, 42, 42, 42. It has become. A connecting bar (see FIG. 2) 23 connects pins 50 and 51 to the driving wheel 21 and the driven wheel 22. are connected so that they can swing in the horizontal direction. The tips of the pins 50 and 51 extend upward and are inserted into the holes 52 and 53 of the workpiece loading table 24. has been done. The workpiece loading table 24 is received by the collars 54 and 55 on the pins 50 and 51. It's stopped.

[0009] The carrier speed control means 60 (see FIG. 3) transmits and receives control signals to and from the ground. a speed control unit 62 equipped with an arithmetic circuit (not shown), and a speed control unit 61 that performs speed control. Motor rotation that converts the speed signal from the control section 62 into the rotation speed of the drive motors 32 and 33 The number of rotations of the number control devices 63 and 64 and the two drive motors 32 and 33 are measured separately. It has two rotation speed measuring devices 65 and 66.

0010 Next, the operation will be explained. The carrier 20 loads the workpiece W on the workpiece loading table 24 and drives two drive motors 3. 2 and 33, it runs on a pair of rails R and R. Two drive motors 32, 3 when the carrier 20 travels on the straight section of the rail R 3 are equally controlled by the carrier speed control means 60. Ru. When the carrier 20 approaches the curved part of the rails R and R, the rail R and the carrier A striker and a detector (both not shown) provided in each of the gears 20 The communication unit 61 detects that the ground station is approaching the ground station (not shown). ). The ground station travels around the curve based on the signal from the communication section 61. The time information is sent to the communication section 61.

[0011] The speed control unit 62 controls the drive motors 32 and 33 based on the information signal from the ground station. Calculate the running speed of. The calculation is performed based on the following formula. V1=(V2+V3)/2 V2=V1(R-L)/R V3=V1(R+L)/R However, V1 is the speed of the carrier itself when traveling around a curve, and V2 is the speed inside the curve. The speed of the drive wheel corresponding to the side, V3 is the speed of the drive wheel corresponding to the outside, L is the carrier The distance from the center of the curve to the drive wheel, R is the distance from the center of the curve to the center of the carrier shall be. The motor (left) rotation speed control device 63 and the motor (right) rotation speed control device 64 control the speed. The rotation of the left and right drive motors 32 and 33 is controlled based on the speed signal from the control unit 62, respectively. Convert to rotation number. Note that the specific means for realizing such control is beyond the knowledge of those skilled in the art. Since it is obvious, its explanation will be omitted.

0012 As a result, for example, in the case of a curve as shown in FIG. 4, the driving wheels 30 are slow and the driving The driving wheels 31 rotate quickly. During this time, the rotation speed measuring devices 65 and 66 detect the drive motor 32, Measure the rotation speed of each of the 33 rotations, and if it differs from the set rotation speed, change the rotation speed. The number correction signal is sent to the motor (left) rotation speed control device 63 and the motor (right) rotation speed control device 6. Send to 4. This causes the drive motors 32 and 33 to rotate at the set rotation speed. . In this way, the carrier 20 passing through the curve at the speed of V1 then The vehicle travels along a straight section at a set speed. Note that even when the carrier 20 is curved in the opposite direction to that shown in FIG. and drive. However, in this case, the drive wheels 30 rotate quickly and the drive wheels 31 rotate slowly. .

[0013]

[Effect of the idea] When the carrier of the present invention travels on a curved part of the rail, the traveling speed control means Due to this, the pair of drive wheels rotate at different speeds, so there is no difference in the direction of the curve. It is possible to smoothly travel around a curved section at a substantially constant speed regardless of the speed.

[Brief explanation of drawings]

FIG. 1 is a plan view of a carrier according to an embodiment of the present invention, with a workpiece loading table omitted.

FIG. 2 is a front view of the carrier, and a partial cross-sectional view corresponding to a view of the carrier seen from the left side in FIG. 1.

FIG. 3 is a circuit diagram of speed control means.

FIG. 4 is an operation explanatory diagram.

FIG. 5 is a schematic plan view of a conventional carrier traveling along a curved portion of a rail.

[Explanation of symbols]

R Rail 20 Carrier 30, 31 Drive wheels 32, 33 Drive motor (drive means) 60 Carrier speed control means (travel speed control means)

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Mino ▲Jiyo▼Osamu 4-17-96 Tsurumi, Tsurumi-ku, Osaka City, Osaka Prefecture Inside Tsubakimoto Chain Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A pair of drive means for rotating a pair of drive wheels that rotate separately on a pair of rails, and separately controlling the pair of drive means when the drive wheels run on a curved portion of the rail. A carrier comprising a pair of separate drive wheels, the carrier having a running speed control means for creating a difference in running speed between the drive wheels running on the outside and the drive wheels running on the inside.