JPH11241704A - Displacement sensor fitting structure of pin type cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the mounting and dismounting of a displacement sensor even in a pin type cylinder, to eliminate the conventional difficulty of maintenance. SOLUTION: A through-hole 31 is drilledly provided, which is penetrating from the outer surface of the bottom part side of a cylinder main body 3 through a pin hole 30 to the bottom surface in the main body 3. The seat 33 of the sensor main body 1 head part is formed between the inner bottom surface port 32 of the main body 3 and the pin hole 30 in the through-hole 31, and also a through-hole 35 communicated with the outside of the main body 3 is drilledly provided in nearby the seat 33, and a sensor main body 1 is inserted from the through-hole port to seat the heat part 10 of the main body 1 to the seat 33; also a connecting wire 36 from outside is pulled into the through-hole 31 via the through-hole 35, and is connected to a conductive wire from the head part 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting a sensor member for detecting a cylinder stroke displacement to a pin type cylinder.

[0002]

2. Description of the Related Art Among sensors for measuring the stroke displacement of a hydraulic cylinder used in construction equipment such as a hydraulic excavator, there are various sensors capable of measuring an absolute value (for example, an operation transformer, a magnetostrictive sensor, a linear potentiometer). In any case, it is necessary to incorporate the detection target and the sensor body into the cylinder.

For example, in an example using an operation transformer, a rod-shaped rod (core) having a magnetic substance to be detected is arranged in a cylinder rod, and the magnetism of the core is detected inside a cylinder body bottom. A cylindrical main body is arranged. In such a configuration, displacement of the cylinder rod is detected by detecting magnetism of the rod rod.

[0004]

The structure described above is generally used in a trunnion type cylinder as shown in FIG. 5, and has no problem in its form. In particular, there is the following problem with the attachment of the sensor body to the cylinder body (there is no problem in attaching the sensor member to the cylinder rod because the cylinder rod is inherently detachable).

That is, in the case of a pin type cylinder, the end on the cylinder body bottom side is supported by a pin, so that
The sensor body is not freely inserted from the outside of the cylinder body, but the sensor body is built into the inside.Therefore, when attaching or removing the sensor body, pull out the cylinder after removing the pin. The body had to be disassembled. Therefore, in particular, when performing maintenance on the sensor main body, it is necessary to go through the same steps many times, which involves very complicated work. Also, when mounting the sensor, it is necessary to connect the conductive wire (electric signal line) from the coil and resistance of the sensor to the external connection line.
Since it is difficult to connect internally, a through hole is provided on the side of the cylinder body, and the conducting wire is taken out from there, and then connected to the externally provided connector terminal by soldering or pin socket connection. Work was required. Therefore, the same operation is required for the attachment after the maintenance, and in combination with the disassembly operation, there has been a great difficulty particularly in the maintainability.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a structure which can easily remove and attach a displacement sensor even in a pin type cylinder, and can solve the conventional difficulty in maintenance. It is something to offer.

[0007]

Therefore, a pin-type cylinder displacement sensor mounting structure according to the present invention comprises a rod-shaped rod provided with an object to be detected and the rod-shaped rod movably inserted into the rod-shaped rod. In a displacement sensor mounting structure for a pin-type cylinder that uses a displacement sensor consisting of a cylindrical body for detecting an object and arranges the rod-shaped rod in the cylinder rod and fixes the cylindrical body to the cylinder body bottom side, A through hole penetrating from the cylinder body bottom side outer surface through the pin hole to the cylinder body inner bottom surface is formed, and the cylindrical body head is inserted between the cylinder body inner bottom surface opening and the pin hole. A seat is formed, and a through-hole is formed near the seat to communicate with the outside of the cylinder body. The tubular body is inserted from the through-hole opening and the head is seated on the seat. And pull the connecting line from the outside into the through hole through the hole, characterized in that connected to the conducting line from the head.

In the structure of the present invention, when attaching the cylindrical body to the cylinder body, first, the pin is pulled out, the cylindrical body is pushed through the opening of the through hole, and the head is seated on the seat. If the seating state is unstable, other fixing means may be used. In this state, a connection line is drawn in from the through hole, and connected to a conduction line from the head in the through hole. Here, since the through hole communicates with the outside, the work required for the connection can be easily performed from the outside. Finally, the pins are fitted and the installation is completed. Therefore, when performing maintenance, the removal may be performed in the reverse order of the mounting, so that it is only necessary to remove the pins and disconnect the connection, and thus the maintenance can be performed extremely easily.

However, when the connection work between the conduction wire and the connection wire is performed by soldering as in the prior art at the time of attachment after maintenance, even though the through-hole communicates with the outside, it is somewhat complicated. With Therefore, if the connection between the conductive wire from the head of the cylindrical main body and the external connection wire drawn into the through hole is made by a connector and a connector terminal that can be connected to each other, the connection work can be performed very easily. Can be performed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the drawings.

This embodiment shows an example of a structure in which an operation transformer is mounted on a pin type cylinder. In the drawing, 1 indicates a sensor main body of the operation transformer, 2 indicates a sensor rod of the operation transformer, 3 indicates a cylinder main body, 4 indicates a cylinder rod, and 5 and 6 indicate pins.

First, an operation transformer to be mounted will be described. FIG. 2 shows the sensor main body 1. As shown in the figure, the sensor main body 1 includes a head 10 having an overhang, and a tubular detector 11 protruding therefrom.

A hexagonal hole is formed in the end face of the head 10.
The male screw 12 is threaded on the outer peripheral surface of the base end on the opposite side, and is screwed with a female screw 34 formed in a through hole 31 described later. A connector terminal 13 is attached to an outer peripheral end on the end face side of the head 10. The detection unit 11 is formed in a cylindrical shape by a double structure including an inner wall 14 and an outer wall 15,
A primary coil / secondary coil 16 for generating an induced electromotive voltage is wound between the walls. The conduction line 17 from each coil 16 is
It is connected to the connector 13 through the inside of the head 10.

FIG. 3 shows the sensor rod 2 of the operation transformer. As shown in the figure, the sensor rod 2, like the sensor body 1, also includes a protruding head 20 and a hollow core 21 protruding therefrom. A point where a hexagonal hole is cut in the end face of the head 20, and a male screw 22 is screwed in the outer peripheral surface of the base end on the opposite side, and screwed with a female screw 44 formed in a through hole 41 described later. Is also the same as the sensor main body 1. In the hollow portion inside the core 21, magnetic substances 23 and non-magnetic substances 24 to be detected are alternately arranged. The core 21 of the sensor rod 2 is inserted into the cylindrical shape of the detection unit 11 of the sensor main body 1 and moves freely there. When the core 21 moves, a change occurs in the induced electromotive voltage by the coil 16 of the detection unit 11,
By detecting the change, the displacement of the core 21 is output.
Therefore, if the sensor rod 2 is attached to the cylinder rod 4, the displacement of the cylinder rod 4 can be detected from the displacement output of the core 21.

Next, a pin type cylinder to which the operation transformer is mounted will be described. The cylinder main body 3 is provided with a through hole 31 penetrating from the bottom outer surface to the inner bottom surface through the pin hole 30. In the through hole 31, the bottom opening of the main body
The sensor body head is located at an arbitrary position between 32 and the pin hole 30.
A seat 33 for locking the 10 is formed, and a female screw 34 screwed with the male screw 22 of the sensor main body head 10 is formed on a hole surface from the seat 33 to the main body bottom opening 32. Further, the seat 33
, A through hole 35 is formed to penetrate the outer peripheral surface of the cylinder body 3. An external connection line 36 having a connector 37 attached to the tip is drawn into the through hole 31 from the outer opening of the through hole 35. The connector 37 is detachable from the connector terminal 13 of the sensor main body head 10. On the other hand cylinder rod 4
The rod portion is formed to be hollow, and its proximal end has a structure substantially similar to that of the cylinder body 3. That is, a through-hole 41 penetrating from the outer surface on the proximal end side through the pin hole 40 to the inner bottom surface of the hollow portion is formed, and any of the through-holes 41 between the hollow portion inner bottom surface opening 42 and the pin hole 40 is provided. A seat 43 for locking the sensor rod head 20 is formed at the position of, and a female screw screwing with the male screw 22 of the sensor rod head 20 is formed in a hole surface from the seat 43 to the hollow bottom opening 42. 44 is threaded.

Next, a procedure for attaching an operation transformer to the pin type rod will be described. First, when removing the pin 5 (including the bush 50), the sensor body 1 is attached.
Since the sensor body 1 communicates from the end face of the cylinder body 1 to the inner bottom of the cylinder body 1, the male screw 12 at the base end of the sensor body and the female screw 34 of the through hole 31 are pushed in while the sensor body 1 is pushed in from the opening of the through hole 31 with a hexagon wrench. Then, the sensor main body head 10 is locked and fixed to the seat 33 of the through hole 31. In the fixed state, the detection unit 11 of the sensor body 1 is in a state where it can be inserted into the hollow of the cylinder rod 4. An elastic bearing 7 is fitted around the outer periphery of the distal end of the detection unit 11, and slides on the inner surface of the hollow portion of the cylinder rod 4 via the bearing 7. Further, in the fixed state, the connection wire 36 is drawn from the through hole 35, and the connector 37 at the tip is connected to the connector terminal 13 of the sensor main body head 10 in the through hole 31. Here, the through hole 31
Is connected to the end face of the cylinder body 1, that is, to the outside, and since the connector is connected, the work required for the connection can be extremely easily performed from the outside. Finally, the pins 5 are fitted, and the mounting of the sensor body 1 is completed. On the other hand, the mounting of the sensor rod 2 is basically
Same as 1. That is, pin 6 (including bush 60)
The sensor rod 2 from the through hole 41 with a hexagonal wrench, and screw the screws 22 and 44 together.When the sensor rod 2 is seated on the seat 43 of the sensor rod head 20, the core 21 of the sensor rod 2 is It is fixed to the first detection unit 11 in a freely insertable state. An elastic bearing 8 is fitted around the outer periphery of the distal end of the core 21, and slides on the inner surface of the hollow portion of the sensor body 1 via the bearing 8. The tip of the core 21 is supported by the detection unit 11 of the sensor main body 1 via the bearing 8, and the tip of the detection unit 11 is further supported by the cylinder rod 4 via the bearing 7.
, The sensor main body 1 is firmly fixed, and the vibration of the coil 16 in the sensor main body 1 is effectively prevented to enable precise sensing.
Finally, when the pin 6 is fitted, the attachment of the sensor rod 2 is completed. The removal of the sensor body 1 and the sensor rod 2 may be performed in the reverse order of the above procedure.

According to the above-described procedure, the mounting and dismounting of the operation transformer of this embodiment is basically performed by
If the parts 5 and 6 are attached and detached, it can be performed very easily without disassembling or assembling other members, and the connection with the external connection line can be easily performed from the outside. Therefore, the complicated work required at the time of maintenance as in the related art becomes completely unnecessary.

When the sensor body 1 is mounted on the cylinder body 3 and the sensor rod 2 is mounted on the cylinder rod 4, the center axes of the respective seats 33 and 43 may be shifted due to variations in processing accuracy. There is. Also,
As shown in FIG. 4, in the case of a structure in which the base end portion 45 and the rod portion 46 of the cylinder rod 4 are joined by welding,
The central axes of the base 45 and the rod 46 may also be displaced.
In such cases, the cylinder rod 4 of the sensor body 1
Insertion of the sensor rod 2 and insertion of the sensor rod 2 into the sensor main body 1 are hindered. For this reason, if deviation of the central axis is expected to some extent, for example, as shown in the figure, the sensor rod 2 is divided into a base end side and a core 21 side at an arbitrary position, and both can slide up and down to some extent. This may be dealt with by arranging the coupling 9 provided with a gap, or a mechanism that can prevent displacement of the connection center by a universal joint or the like may be used. The other configuration of the embodiment shown in FIG. 4 is the same as that of the embodiment, and this embodiment is of course included in the scope of the present invention.

[0019]

As described above, according to the pin-type cylinder displacement sensor mounting structure of the present invention, the mounting and dismounting of the displacement sensor can be performed very easily even with a pin-type cylinder. As a result, the maintainability is improved, and the displacement sensor is freely attached to the pin-type cylinder, so that a pin-type cylinder with a displacement sensor can be used as never before, and a remarkable effect that the degree of freedom in design is improved is obtained. It is something that can be done.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a preferred embodiment of the present invention and showing a state in which an operation transformer is attached to a pin type cylinder.

2A and 2B show a sensor main body of an operation transformer, wherein FIG. 2A is a side view, FIG. 2B is an enlarged sectional view of a portion A in FIG. 2A, and FIG. 2C is a front view of FIG.

3A and 3B show a sensor rod of an operation transformer, wherein FIG. 3A is a side view, FIG. 3B is an enlarged sectional view of a portion B in FIG. 3A, and FIG. 3C is a front view of FIG.

FIGS. 4A and 4B show another embodiment of the present invention, in which FIG. 4A is an explanatory view of the embodiment provided with a mode for preventing a trouble caused by a deviation of the center axis, and FIG. 4B is an enlarged view of a C portion in FIG. It is.

FIG. 5 is an explanatory view showing a conventional trunnion type cylinder.

[Explanation of symbols]

 1 Sensor body 2 Sensor rod 3 Cylinder body 4 Cylinder rod 5, 6 Pin 31, 41 Through hole

Continued on the front page (72) Inventor Hiroshi Sakamoto 1-6 Higashicho, Hachioji-shi, Tokyo Hashikan LK Building Inside Amitec Co., Ltd. (72) Inventor Kazuya Sakamoto 1-6 Higashicho, Hachioji-shi, Tokyo Hashikan LK Building Amitec Co., Ltd. Inside

Claims (2)

[Claims] 1. A displacement sensor comprising: a rod-shaped rod having a detection target; and a cylindrical main body for detecting the detection target while movably inserting the rod-shaped rod into the rod-shaped rod. In the pin type cylinder displacement sensor mounting structure for fixing the cylindrical body to the cylinder body bottom side, the through hole penetrating from the cylinder body bottom side outer surface to the cylinder body inner bottom surface through the pin hole. A seat for the head of the cylindrical body is formed between the bottom hole in the cylinder body and the pin hole, and a through hole communicating with the outside of the cylinder body is formed near the seat. Installed, the cylindrical body is inserted from the through hole opening, the head is seated on the seat, and a connection line from the outside is drawn into the through hole through the through hole,
A pin-type cylinder displacement sensor mounting structure, which is connected to a conduction line from the head. 2. The connection between the conductive wire from the head of the tubular main body and a connection wire from outside drawn into the through-hole as a connection by a connector and a connector terminal. Mounting structure of displacement sensor for pin type cylinder.