JPS62245101A - Agricultural contact type sensor - Google Patents

Abstract

PURPOSE:To prevent the erroneous operation of a working machine, by providing a stopper for prescribing the shaking range of a movable member in the pivot part of the movable member. CONSTITUTION:In an agricultural working machine such as a combine, the base end part of a movable member exerting contact action on stalks is pivotally supported in a state freely shaking around an axis X by the support shaft 13 provided to the fixing member 11 in the leading end part side thereof in a protruded state. The base end part of the member 10 is formed so that the cross-sectional shape thereof becomes recessed to form a pivotal part A. Next, the upper surface part of the member 11 positioned in the pivotal part A is formed into an upwardly protruded convex shape in a state positioned between the inner wall of the pivotal part A and the support shaft 13 to provide a stopper 14 for prescribing the shaking range of the member 10 to a return energizing side thereof. Subsequently, the inner wall part of the pivotal part A of the member 10 is formed into a protruded part protruding toward the support shaft 13 to provide the contact part 15 brought into contact with the stopper 14. As mentioned above, by providing the stopper 14 and the contact part 15 in the pivotal part A, foreign matter such as straw waste is prevented from being held between both of them and the erroneous operation of a sensor can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to, for example, in agricultural working machines such as combines, whether or not stem culms are introduced into various processing sections such as the reaping section and the threshing section;
Regarding an agricultural contact sensor used as a means for detecting the passage or position of a stem culm moving along a conveyance route, in detail, a movable member that is swingably supported on a fixed member is fixed at a predetermined position. A stopper is provided on the fixed member to urge the movable member back and restrict the range of swing of the movable member, and a magnetic field detects the swing position of the movable member with respect to the fixed member based on a change in magnetic field strength. An agricultural contact is provided on the fixed member side, and a magnetic force generating means for changing the magnetic field strength in the swinging direction of the movable member in accordance with the swinging of the movable member is provided on the movable member side. Regarding the type sensor.

[Conventional technology]

This type of agricultural contact sensor described above is configured so that when a detection object comes into contact with a movable member that is pivotably supported relative to a fixed member, the movable member is oscillated relative to the fixed member. , which is used by being installed in the passage of the sensing object, and by detecting the swinging position of the movable member, the passage of the sensing object and the presence or absence of the sensing object can be determined. It is designed to detect deviation, etc., and the fixed member is provided with a stopper for regulating the swing range of the movable member.

Furthermore, since it is desired to simplify the wiring structure, the magnetic sensor is provided on the fixed member side, and the magnetic force generating means for this magnetic sensor is provided on the movable member side.

Conventionally, a stopper for regulating the swinging range of the movable member is provided on the fixed member side, for example, located on the outer side of the pivot portion of the movable member.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional configuration, the stopper provided on the fixed member side is located on the outer side of the pivot portion of the movable member with respect to the fixed member, so that the stopper and the contact portion on the movable member side are There is a risk of foreign matter such as straw being caught between the two, and as a result, the swing range of the movable member changes, and the magnetic field strength that changes with the swing of the movable member relative to the magnetic sensor may change from the set strength. There is a risk that the sensor may malfunction due to misalignment.

The present invention has been made in view of the above circumstances, and its purpose is to prevent malfunctions while simplifying the sensor configuration using a magnetic sensor.

Means for Solving Problem c] The characteristic configuration of the contact type sensor according to the present invention is that the stopper is provided inside the pivot portion of the movable member, and its operation and effect are as follows. It is as follows.

[For production]

In other words, the stopper that restricts the swing range of the movable member is
Since the stopper is provided inside the pivot portion of the movable member, there is no risk of foreign matter being caught between the stopper and the contact portion of the movable member that abuts the stopper. It can be changed accurately as desired with the rocking.

〔Effect of the invention〕

Therefore, as in the past, by providing a magnetic sensor on the fixed member side and providing a magnetic force generating means on the movable member side,
While simplifying the sensor configuration, it is possible to prevent foreign objects from being caught between the movable member and the fixed member, thereby improving the reliability of the sensor.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in Figure 3, a pair of left and right crawler traveling devices (1
) is equipped with a threshing section (2) and a control section (
3), and a triggering device (
4), a reaping unit (5), a reaping section (7) equipped with a reaping device (5), a vertical conveyance device (7) for receiving and passing the reaped stem culm to the conveyance start end of the threshing feed chain (6) installed in the m-crotch section (2); 8) to constitute a combine harvester, which is an example of an agricultural working machine.

Said vertical conveyor! (7) is a clamping conveyance device (7a) that acts on the base side of the harvested stem culm and a locking conveyance device that acts on the tip side! (7b), the receiver carries over the harvested stem culms fed from the reaping device (5) in a vertical position, lifts them to the rear side of the machine, and at the end of the conveyance, turns the stem culms into a horizontal position. The posture is changed so that the threshing is fed to the starting end of the threshing feed chain (6). Moreover, the vertical conveyance device (7
) is connected to the support frame (9) of the reaping section (8) so as to be swingable around the horizontal axis (P).

Then, by swinging the vertical conveyance device (7) around the horizontal axis (P) using an actuator (not shown), the clamping conveyance device (7a) can move the harvested stem culm when receiving or splicing it. The gripping position changes toward the culm, and the gripping position of the stalk culm when passing it to the threshing feed chain (6) is changed toward the culm, and the threshing section (2) moves into a handling chamber (not shown). ) The length of the culm inserted into the culm, that is, the handling depth, can be adjusted.

In order to detect culm length information for adjusting the handling depth, a pair of culm length sensors (
Sl) and (St) are connected to the locking conveyance device (7b) and the clamping conveyance bag? ! They are arranged in parallel toward the culm direction of the conveying stem culm on a support frame (7C) that supports each of the ff1 (7a). In other words, the pair of culm length sensors (So, (SZ
) is not in contact with the stem culm, it is determined that the culm is a short culm, and when only the lower culm length sensor (S, ) is in contact with the stem culm, it is determined that the culm is a standard culm length. Then, the culm length is detected in three length ranges so that a long culm is determined when both of the pair of culm length sensors (Sl) and (SZ) are in contact with the culm. Then, the pair of culm length sensors (Sl), (
Based on the detection information by Sz), the @transport device (7
) can automatically adjust the depth of threshing in the threshing section (2).

Further, as a means for detecting the start and stop of the reaping work and detecting information for controlling the operation of each section such as the threshing section (2) and the reaping section (8), a stalk culm introduced into the reaping section (8) is used. Stock base sensor (
So) is provided at the reaped stem culm confluence section of the reaping section (8).

However, these stock sensor (So) and a pair of culm length sensors (s+), (Sl) are each constructed using agricultural contact type sensors (S) with the same configuration, and the configuration will be explained next. Explain in detail.

As shown in FIGS. 1 to 4, a movable member (10
) is pivotally supported around the axis (X) with respect to a resin fixing member (11) whose cross-sectional shape is formed into an abbreviated shape on the proximal side. . Further, the fixing member (11
) is formed with a mounting hole (12) at its base end, and a support shaft (13) is formed at its distal end side to swing the movable member (10) around the axis (X). ) is installed protrudingly.

The proximal end portion of the movable member (10) is formed to have a concave cross-sectional shape to form a pivot portion (A), and a fixed member ( 1
1) The upper surface portion is formed into a convex shape that protrudes upward while being located between the inner wall of the pivot portion (A) and the support shaft (13) protruding from the fixing member (work 1). A stopper (14) is provided to restrict the swinging range of the movable member (10) toward the return urging side.
), an inner wall portion of the pivot portion (^) of the movable member (10) facing the support shaft (13) is formed into a convex shape projecting toward the support shaft (13), and a contact portion that abuts the stopper (14) is provided. (15) is provided. Further, a helical spring (16) that urges the movable member (11) back toward the stopper (14) is attached to the pivot portion (16) of the movable member (10).
A), and is provided so as to be wound so as to cover the support shaft (13).

Further, a recess (20) is formed on the end surface side of the abutting part (15) of the movable member (10) facing the fixed member (11), and a permanent magnet (18) as the magnetic force generating means (B) is inserted into the recess (20). It is installed in the recess (20) with the end surface not protruding from the end surface of the pivot portion (^), and the Hall element as a magnetic sensor and its sensing signal processing circuit are mounted on an IC.
The converted hole IC (17) is attached to the movable member (10).
The Hall IC is sealed at a position where the sensing magnetic field strength with respect to the permanent magnet (18) is maximum when the contact portion (15) of the Hall IC is in contact with the stopper (14) of the fixing member (11). (17) on the fixed member (11) side, from the lower surface of the fixed member (11) toward the direction in which the permanent magnet (18) on the movable member (10) side is located. In addition to forming a recess (21), a recess for positioning is provided at a position where the Hall IC (17) comes into contact, and the cross section thereof has a substantially convex shape toward the direction in which the permanent magnet (18) is located. (22) is formed in double form. Then, a wiring member (
19) is connected to the Hall IC (17), the Hall IC (17) is inserted into the positioning recess (
22) into the recess (21) formed in the fixing member (11), and after temporarily fixing it by pushing the resin fixing plate (23) from its blue side, The entire recess (21) is sealed with a filler (24) (for example, epoxy resin containing a hardening agent).

Therefore, the entire connection portion between the hole IC (17) and the connection wiring member (19) is kept airtight by filling the recess (21) formed in the fixing member (11) with a filler (24). Since it is sealed, it is possible to achieve sufficient waterproofness and dustproofness with a simple operation.

Then, as the stem culm comes into contact with the movable member (10), the opposing surfaces of the abutment part (15) of the movable member (10) and the stopper (14) are brought into contact with each other around the axis (X). As a result, the Hall IC (17) and the permanent magnet (18) are moved apart from each other, and the magnetic field strength for the Hall IC (17) is reduced. As the magnetic field strength decreases below the set dark value of the sensing magnetic force of the Hall IC (17), the output of the Hall IC (17) changes from "L" to "H".
It is detected that the movable member (10) has swung by a predetermined angle or more, that is, that the stem culm has contacted the movable member (10).

[Another example]

Next, another embodiment of the agricultural contact sensor (S) will be described. However, in each example described below,
Same structure as the first embodiment shown in FIGS. 1 and 2 above.
Or, members having similar functions are denoted by the same numbers or symbols as in the first embodiment, and the explanation thereof will be omitted.

As shown in FIG. 6, the magnetic force generating means (B) includes a permanent magnet (18) that generates a weak magnetic force that cannot be detected by the Hall IC (17) alone. ) on the back side of the stopper (14).
A magnetic material (25) is provided on the contact portion (15) of the movable member (10) that contacts the stopper (14).
) may be provided to indirectly change the magnetic field strength for the Hall IC (17).

That is, as the movable member (10) swings, the magnetic material (25), the Hall IC (17), and the permanent magnet (18) are separated, and the permanent magnet (18) and the magnetic material (25) reduces the magnetic field strength applied to the Hall IC (17). Therefore, the hole t
If c (17) is configured so that the output signal is reversed from "L" to "H" as the magnetic field strength decreases, the swing of the movable member (10) can be reduced as in each of the above embodiments. Can be detected. In addition, in this second embodiment, the fixing member (11
Although a permanent magnet (18) is provided on the ) side to generate magnetic force, an electromagnet may be used instead of the permanent magnet (18). Even when this electromagnet is used, since the magnetic force generating means ([1) is provided on the fixed member (11) side, the wiring etc. for the magnetic force generating means (B) can be connected to the fixed member (1).
1) Since it can be fixed on the side, there is no risk of it getting caught on the movable member (10) (there is no problem).

Further, as shown in FIG. 7, a plurality of the Hall ICs (17) are arranged along the swinging direction of the movable member (10), so that the swinging position of the movable member (10) can be set in multiple stages. It may be possible to detect the entire area. Further, in order to detect the swinging position of the movable member (10) in multiple stages, the Hall IC (
A plurality of permanent magnets (17) are arranged along the swinging direction of the movable member (10), and a plurality of permanent magnets (18) are arranged along the swinging direction of the movable member (10). Good too.

Further, the Hall IC (17) is configured to output a voltage or current that changes in response to the sensed change in magnetic field strength, so that one Hall IC (17) can control the swinging of the movable member (10). The position may be detected in multiple stages or continuously.

In each of the above embodiments, the magnetic sensor (17)
However, the case is exemplified in which the detection operation is performed as the strength of the magnetic field generated from the permanent magnet (1 day) as the magnetic force generating means (B) decreases as the movable member (10) swings. , it may be configured to operate by sensing the increasing magnetic field strength at the detection position, and the specific configuration, such as the sensing level of the change in magnetic field strength and the direction of the sensing change, can be changed in various ways.

Further, in the above embodiment, the stopper (14) is connected to the movable member (
10), but the movable member (10) may be provided at a position that restricts the swinging end of the movable member (10), and the specific configuration can be changed in various ways.

The present invention also provides a stock sensor (S
o), culm length sensors (S+), and agricultural contact sensors other than (SZ), and the specific configuration depends on the application location, detection target, and detection information.
Various changes can be made.

[Brief explanation of drawings]

The drawings show an embodiment of the agricultural contact sensor according to the present invention,
Figure 1 is a schematic plan view of the sensor, Figure 2 is nm of Figure 1.
3 is an enlarged cross-sectional view showing the structure of the pivot portion of the movable member, and FIG.
FIG. 5 is a front side view showing the general structure of the combine harvester, and FIGS. 6 and 7 are schematic plan views showing the structure of another embodiment. (A)... Pivotal part, (B)... Magnetic force generating means, (10)... Movable member, (11)...
...Fixing member, (14) ...Stopper, (
17)...Magnetic sensor, (18)...
··permanent magnet.

Claims (1)

[Scope of Claims] [1] A movable member (10) pivotably supported on a fixed member (11) is provided so as to be biased to return to a predetermined position, and the movable member (10) is A stopper (14) for regulating the range of movement is provided on the fixed member (11), and
A magnetic sensor (17) that detects the swinging position of the movable member (10) with respect to the fixed member (11) based on changes in magnetic field strength is provided on the fixed member (11) side, and the movable member (10) ) is provided with a magnetic force generating means (B) on the movable member (10) side that changes the magnetic field strength in the swinging direction of the movable member (10) according to the swinging of the movable member (10), The stopper (14)
An agricultural contact type sensor located inside the pivot portion (A) of the movable member (10). [2] The agricultural contact sensor according to claim [1], wherein the magnetic force generating means (B) is a permanent magnet (18). [3] Claim [1] or 2, wherein the magnetic sensor (17) is configured using a Hall element.
Agricultural contact type sensor described in section. [4] The magnetic sensor (17) or the permanent magnet (18)
The agricultural contact sensor according to claim 2 or 3, wherein a plurality of sensors are provided along the swinging direction of the movable member (10).