JPS5812318Y2 - Non-contact treadle - Google Patents

Description

[Detailed explanation of the invention] The invention is based on the invention, for example, when the number of axles on a toll road is reduced to t.
The present invention relates to a non-contact type footboard used as a sensor for illumination.

On toll roads, toll fees often vary depending on the type of vehicle, such as large vehicles or regular vehicles.

On the other hand, there is a recent trend toward completely unmanned toll collection operations on toll roads, and such unmanned systems must accurately identify vehicle types.

In conventional systems, optical sensors detect the vehicle body, and a tread plate installed on the road surface, which is a switch for detecting the number of axles, detects the number of times the tires are pressed, and determines whether the number of axles is two or three or more. The system detects whether the vehicle is a large vehicle or a vehicle smaller than an ordinary vehicle.

For reference, Figure 1 shows an example of how treads are used on toll roads.

The figure is a perspective view of a tollgate, and 1 is an island λ of the tollgate.
2 is a vehicle, and this vehicle 2 enters from the direction of the illustrated arrow.

Near the entrance of the lane, a light emitting part 3 and a light receiving part 4 of an optical sensor for distinguishing vehicles one by one on both sides of the lane are arranged so as to face each other. Vehicles traveling in the lane block the light beam irradiated toward the vehicle, thereby separating and discriminating the vehicles one by one.

Immediately below the optical axis of this light beam, a footboard 5 is placed buried in the road surface across the entire width of the lane.

This treadle 5 has a switch body molded with rubber, and when it is pressed by the wheel of a passing vehicle and the switch portion closes, it detects the wheel, and the number of axles is determined from the number of times the treadle 5 detects while the light beam is interrupted. Count.

6 is an automatic toll collection machine installed on Island 1,
The toll determined based on the number of axles mentioned above is displayed, for example, on the display 7 of the automatic toll collection machine 6, and the driver van puts the toll corresponding to this into the hopper 8 of the automatic toll collection machine 6. The toll collector 6 automatically checks this and opens the barrier 9 provided at the exit side of the toll gate.

Passage of a vehicle is detected by a loop coil type vehicle detector 10 installed on the road near the barrier 9, and the barrier 9 is closed.

FIG. 2a shows a perspective view of a conventionally used step board 5, and FIG. 2 shows its cross-sectional structure.

11 is the road surface, and 12 is the main body of the treadle 50, which is entirely molded with rubber and is usually buried at the same height as the road surface 11.

13 is a reinforcing iron plate provided at the bottom of the main body 12;
S□, ~t S 4 are hollow core-shaped contact bodies arranged along the traveling direction of the vehicle, and are inserted into the cavity of the main body 12, so that the main body 12 is crushed under the pressure of the wheels. When the condition is reached, the contact body of that part closes the circuit.

The structure of the contact body S1-84 is as shown in FIG.
Electrode metal plates S are placed above and below the rectangular cavity 14 of the main body 12.
A and Sb are provided facing each other.

Note that 15 is a lead wire for deriving a signal.

It is as above.

By the way, when a vehicle passes, the pressure P is applied to the treadboard 5 in a direction that flows slightly in the direction of travel of the wheels, so the main body 1
Since the cavity 14 of No. 2 is in a state of being obliquely crushed, the electrode metal plate Sa.

For example, as shown in FIG. 4, the sb's slide into contact with each other and are electrically connected to detect the passage of a vehicle.

Therefore, since the conventional step board is operated by deforming the main body 14 due to the pressure applied by the foot, stress is concentrated on the section AA in FIG. 4, which is a factor that determines durability.

Therefore, if this is reinforced, the sensitivity of the movement will become duller.

In addition, since the dynamic load when the wheels pass flows in the direction of travel as shown in Figure 4, when the metal plates Sa and Sb for electrodes come into contact, these metal plates Sa and Sb for electrodes come into sliding contact with each other, causing friction particles. will occur.

If the amount of friction powder increases, a short circuit will occur between the electrode metal plates Sa and Sb, resulting in false positive detection.

Further, since the contact body 14 of the tread plate having such a structure has a hollow core shape, the structure is complicated and the cost in the manufacturing process is high.

Furthermore, since the tread plate 5 is a rubber mold, in order to vulcanize the rubber, a mold consisting of an upper mold 16 and a lower mold 17 as shown in Fig. 5 is required. It is also necessary to remove the material from the mold.

Here, as shown in FIG. 2, a plurality of contact bodies Sly~
The reason why the S4s are arranged in parallel along the way the vehicle travels is to determine whether the wheels are moving forward or backward.
This is because if they are closed in an orderly manner, it is determined that the vehicle is moving forward, and if the reverse is the case, it is determined that the vehicle is moving backward.

The present invention was developed in view of the above circumstances, and consists of disposing a conductive rubber whose resistance value changes when deformed under pressure between a pair of electrodes.
High durability is achieved by using a contact body whose outer periphery of the electrode is wrapped with a film material such as polyester, and by arranging a plurality of these contact bodies in parallel in a groove of concave steel, and molding the inside of this groove with rubber. The purpose of the present invention is to provide a non-contact type treadle which has improved performance and reliability, eliminates the need for a lower part of the mold, and is designed to simplify the structure and reduce costs.

An embodiment of the present invention will be described below with reference to FIG.

The present invention consists of a conventional switch body made of conductive rubber, which minimizes the displacement (distortion) of the contact body due to tread pressure, resulting in a highly durable and simple structure, and a substantially U-shaped cross section made of concave steel. It is featured in that it is housed in a rigid housing, eliminates the need for the lower part of the vulcanization mold, and eliminates the need for removal from the mold.

Here, conductive rubber is a transducer whose electrical resistance changes in response to pressure stimulation, and the magnitude of the resistance change varies from an insulating state (several 101 VLQ) to a conducting state (several 1i) t according to the magnitude of pressure. It is a pressure-sensitive resistor with a switching function that changes the power supply.

For example, the conductive rubber made by Japan Synthetic Rubber Co., Ltd. has an unpressurized dark resistance of 1
0. It has the following characteristics: Q = 102J7-C, pressurized dark resistance.

Only the pressurized parts of the housing are electrically conductive.

Its properties as a rubber are the same as those of ordinary rubber; for example, it has a hardness of 70 degrees, a density of 3.39/cyrt, a tensile strength of 1 cup, and an elongation of 200%.

The operating pressure varies slightly depending on the type, but the suppression is 0.1 to 3K.
It becomes conductive at ycrl.

FIG. 7 is a sectional view showing the configuration of the present device, and in the figure, 71 is a housing made of a rigid body and having a substantially U-shaped cross section, for example, concave steel.

51tS2 is a contact body, and this contact body S□. S2 is the conductive rubber 74 mentioned above between the electrodes 72 and 73 arranged oppositely.
are held in place, and a film material 75 made of an insulating material such as polyester is wound around the outer periphery to form a structure 6.

This contact body S□tS2 is disposed in a groove of the housing 71 made of concave steel, filled with rubber 76, and the inside of the housing 71 is rubber-molded to form a step board.

This device with such a configuration connects a lead wire (not shown) to the electrode 7.
2. Connect each to 73 and connect to the power supply to suit the power supply 72.
By extracting the change in resistance value of the conductive rubber 74 held between the contacts 73 as a change in voltage or current, the contact body S1. S
2 on/off is detected.

That is, the contact bodies S□, S2 are arranged inside the housing 71, and the rubber 7
Since the housing 71 has an open top surface, when a vehicle passes over the top surface and receives pressure from the wheels, the rubber 76 receives pressure and absorbs the pressure. Contact body S1*S below the receiving part
2 is pressed against the bottom surface of the housing 71.

As a result, the conductive rubber 74 held between the electrodes 72 and 73 of the contact body is deformed by pressure, and its electrical resistance value decreases.

Therefore, since the contact body is in a conductive state, it is possible to detect that it has received a pedal pressure.

Note that the contact body S1. Film material 7 wound around the outer circumference of S2
Reference numeral 5 is provided to prevent the rubber 76 from penetrating between the electrodes 72, 73 and the conductive rubber 74 and forming an insulating layer during molding with the rubber 76.

In this way, the conductive rubber, whose resistance value decreases when pressure is applied, is sandwiched between the electrodes, and it is a non-contact type that turns on and off by stepping pressure, minimizing mechanical deformation, and eliminating frictional contact, which increases durability. In addition to being significantly improved over the conventional method, it also provides high reliability.

In addition, since the contact body is placed inside the housing and the inside of the housing is rubber-molded, the lower part of the mold is completely unnecessary, and the housing serves as the iron plate 13 of the conventional device. Unlike the conventional method, there is no need to remove the step plate from the mold after vulcanization molding, and the structure of the contact body is simple, so the number of manufacturing steps can be reduced and costs can be reduced.

The reason why two contact bodies are arranged in parallel in FIG. 7 is to detect forward or backward movement of a passing vehicle based on the order of pedal pressure, as in the conventional case, and the number may be increased or decreased as necessary.

As detailed above, a conductive rubber whose resistance value changes when deformed under pressure is placed between a pair of electrodes, and the outer periphery of the electrode is wrapped with a film material such as polyester to form a contact body. Multiple bodies are arranged side by side in concave steel grooves, and the grooves are molded with rubber, which dramatically improves durability and reliability, as well as simplifying the structure and reducing manufacturing man-hours. Therefore, it is possible to provide a non-contact step board having excellent features such as cost reduction.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with appropriate modifications within the scope of the invention.

[Brief explanation of the drawing]

Fig. 1 is a diagram for explaining the schematic configuration of a toll gate of an unmanned toll road system, Fig. 2 a is a perspective view showing the structure of a conventional treadle, Fig. 2 is a side sectional view thereof,・Third
The figure is a sectional view showing the structure of the contact body used in the tread, FIG. 4 is a sectional view showing its operating state, and FIG. 5 is a sectional view showing a mold used for molding the conventional tread. FIG. 6 is an operation timing chart of each contact body of the step board, and FIG. 7 is a sectional view showing an embodiment of the present invention. 71... Housing, 72.73...- Electrode,
74... Conductive rubber, 75... Film material, 76... Com, 51yS2... Contact body.

Claims (1)

[Scope of utility model registration request] A contact body in which a conductive rubber whose resistance value changes when deformed under pressure is placed between a pair of electrodes, and the outer periphery of the electrode is wrapped with a film material such as polyester. A non-contact type tread plate characterized by having a rubber mold inside the groove.