JPS58207487A - Depth detecting apparatus for shaft hole drill machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a depth detection device attached to a hole drilling machine such as an earth drill or a packet-type continuous wall machine in which a drilling tool is supported by a wire rope (2). Continuous wall machine (for two).

In order to facilitate this repeated work (2. In order to make this repetitive work easier in relation to drilling a hole from 2.)

In Figure 1, a method is adopted in which the wire rope 2 (packet 3 is supported by two twists) is attached to the ground drill l.The packet 3 is attached to the lower end of the Kelly bar 4, and the Kelly bar 4 is installed on the front frame 5. The Kelly bar drive device 6 allows the Kelly bar 4 and the packet 5 (i.e., the excavating tool ) is rotated (2 0) Also, the wire rope 2 is connected to the sheave 9 at the upper end of the boom 8 C: 3''
”Kerare.

Winch 10
2C) Such a silent excavator (2) moves the packet up and down to take in earth and sand into the packet 3 and remove it (
- In order to shorten the time required (-, the lowering of the packet is done by releasing the brake of the winch 10 and releasing the clutch to release the power transmission and descend by the weight of the excavating tool.) However, if the free ball operation is performed continuously until the packet reaches the bottom 1 m of hole 11, the packet will not reach the bottom of the hole. 11a (2) There is a risk of violently colliding with the excavator and damaging the excavating tool.For this reason, conventionally, a depth indicator is provided in the operator's cab (2) to display the depth of the excavating tool, and the operator has to look at the value displayed on the depth indicator. (2) When the drilling tool approaches the hole bottom 11a (2), the depth of the drilling tool is known, and (2) the brake is operated to prevent the drilling tool from colliding violently with the hole bottom (2). The device uses a rotary encoder, a proximity switch, a photoelectronic switch, etc. (two methods are used) to detect the amount of rotation of the sheave 9, which rotates in proportion to the amount of payout of the wire rope 2 that supports the excavation tool. Of these, rotary encoders require a mechanical transmission mechanism, which causes problems in terms of maintenance, complexity, and the need to install them in narrow spaces. As non-contact switches such as photoelectronic switches are installed (0), however, such non-contact switches (-) are used to detect the amount of movement of the wire rope and determine its direction (
Second, many switches had to be installed, and due to space constraints, it was not possible to install a switch head to determine the direction (second, a switch was provided for the operator to operate, and the amount of movement could be added by switching the switch). A mechanism for deep calculation of excavation tools such as subtraction was incorporated into the calculation section 0
The present invention aims to simplify the installation space and reduce costs when such a non-contact type switch is used.

To achieve this objective, the present invention provides a depth sensor for a silent excavator in which the excavating tool is supported by a wire rope (2), while a non-rotating depth sensor in the vicinity of the sheave that rotates due to the movement of the wire rope. If a plurality of wire rope movement detection switches provided in the section (2) and the sheave (2 circumferential directions (1 equal interval) are provided and the sheave rotates at a constant speed, switch driving means for operating the switches at equal time intervals; and a moving direction detecting switch that is operated by the switch driving means to detect the moving direction of the wire rope, and at least one of the moving amount detecting switches. It is characterized in that each of the pieces also serves as a switch for detecting the direction of movement.

Hereinafter, one embodiment of the present invention will be described using a permanent magnet and a switch operated by C2 to detect the amount of wire rope movement (if there are two agents, take the C2 side and explain from 1 Drawing C2. 02 South is the depth display device) It shows the overall configuration of the detection device including
13 is a movement amount detector consisting of two switches 13a and 13b for detecting the amount of movement of the wire rope 2, and 14 is a switch 14a for determining whether the wire rope 2 is being let out or retracted. Movement direction detector.

15 receives a signal from the switch 14a of the moving direction detector 14 and a signal from a switch 13b of the moving direction detector 13 which is also used for detecting the moving direction, and determines whether the wire rope 2 is let out or retracted. 016 is a calculation device that calculates the depth of the excavation tool; 31 is a digital switch (consisting of two parts) that can arbitrarily determine the amount of movement of the wire rope 2 per pulse interval of the movement amount detector 13; The arithmetic unit 16 receives an on-off type digital signal from the movement amount detector 13, a signal from the discrimination circuit 15, and a signal from the unit length setter 31. 020 is a reset button that resets the value of the calculation device 16 to zero (020 is a reset button that resets the value of the calculation device 16 to zero). The display meter that displays may be equipped with either a digital display meter or an analog display meter, but
This embodiment includes a digital display 17 that receives signals from the arithmetic device 16 and displays numerical values, a digital-analog converter 18 that converts the digital signal from the arithmetic device 16 into an analog signal, and a digital-analog converter 18 that converts the digital signal from the arithmetic device 16 into an analog signal.
It is equipped with an analog display meter 19 that displays the depth by receiving an analog signal from the excavator. In order to make it possible to read the depth more accurately (2), in this embodiment (2), in order to reduce the burden on the operator in recognizing the depth of the drilling tool during free hole (2, When brake operation is required, that is, just before the drilling tool reaches the bottom of the hole, or when using a multi-stage kelly bar, just before each stage of kelly bar is fully extended and the protrusions for preventing extraction collide (two or When the outermost kelly bar (outer kelly bar) collides with the upper part of the kelly bar drive device (25)
A device 25 for issuing the alarm (equipped with two devices,
32a, 32b, 32c are depth setters for setting arbitrary depths such as the depth unit Kelly bar length of the bottom of Jl; 33a, 3;
3b, 33c are the depth setters 32a, 32b, 32
c (': l - Therefore, the depth is shallower by an appropriate depth l set in consideration of brake operation than the set depth (comparators 34a, 34 for comparing whether the depth is 2 or not).
b-34c receives signals from each comparator (L-
When the depth of 1) is reached, each depth (2 pairs of lamps 35a
, 35b, 35c to blink and sound the buzzer 36, as well as switch to the instruction to turn on the two pairs of lamps 35a, 35b, 35c, and sound the buzzer 36. 11 is the buzzer/lamp drive curved shaft that gives the second instruction.The feature of the present invention is that the movement amount detector 1
3, the movement direction detector 14, and the discrimination circuit 15-g, as shown in FIGS. The side surface (2) is provided with two rings 50 made of magnetic material.The structure in which the ring 50 is provided is other than a structure where it is integrally formed with the sheave 9 (2) or a structure where it is welded (2) as in the Zuso example. Various types of structures such as bolting and fitting structures can be adopted.A plurality of permanent magnets 24 are embedded in the outer periphery of the ring 50 (- indicates a plurality of permanent magnets 24 are embedded at equal intervals in the circumferential direction C (-1 and partially [excluding the surface)]. (2) When the permanent magnet 24 approaches (2) the movement amount detection switch 13a is activated.
13b and the moving direction detection switch 14a are attached to the non-rotating part near the sheave (-) with a gap of two (2) so that they do not come into contact with the permanent magnet.

As is clear from FIGS. 3 and 4, the movement amount detection switches 13a and 13b are one switch 13a (
13b) is directly above the permanent magnet 24, the other switch 13b (13a) is positioned at an intermediate position (-) between the two permanent magnets 24 arranged at equal intervals on the circumference of the sheave 9. Therefore, as shown in FIG.
Therefore, by providing two switches for the movement amount detector 13, the permanent magnet 2
The amount of movement of the wire rope can be detected with an accuracy of 4% of the installation interval (C unit detection length). Movement amount detector 13
If you set the number of switches to 3, 4, and 5.

It is clear that the detection accuracy is also %, %, and %(-, respectively.

In addition, in this embodiment, an example is shown in which the permanent magnets 24 are arranged around the outer circumference of the sheave 9 (21 rows), but in the case of one row, not only the movement amount detector 13 but also the movement direction detector 14 is attached. Also, the number of switches of the movement amount detector 13 can be unlimited (- by adding (-)
It's impossible. Therefore, by increasing the number of switches of the movement amount detector 13 by providing two or more rows of permanent magnets 24, the detection accuracy can be further improved.

In addition, in this embodiment, the permanent magnet 24 is embedded in the counterbore part of the sheave 9 (two-piece ring 50 made of magnetic material, excluding the surface part) so as to protect it and limit the range of magnetic field generation. Therefore, only two magnetic fields are generated near the permanent magnet 24.

Since the operating time of the switch can be shortened and the amount of pulses generated per unit movement amount can be increased, the unit length of movement to be detected can be shortened.On the other hand, the movement direction detector 14 The switch 14a that constitutes the movement amount detector 13 and the switch 13b that constitutes the movement amount detector 13 and also serves as a movement direction detection switch are used to The brackets 40 (2) are attached so that the positional relationship is the same. That is, the sheave 9 is rotated clockwise (
wire rope payout direction) (when the wire rope is rotated twice (the second is
Figure 6 + Al (- As shown (2, one switch 131
) (in contrast, the other switch 14a is activated with a delay, and after a time lap of T2, the switch 13b is deactivated. The sheave 9 rotates in the counterclockwise direction (wire rope retraction direction) in FIG. 3. When (2) is shown in Figure 6 (B) (
2 As shown (contrary to 2 (A)) (-, the switch 13b operates with a delay with respect to the operation of the switch 14a, and after the time lap of T2, the operation of 14a stops. 0 In this way, the switches 13b and 14a This is to determine which of the two actuated first and the direction of movement of the wire rope.

Therefore, the discriminating circuit determines that the operations of the switches 13b and 14a are temporally delayed and (
The output signal is changed depending on the result of the comparison (-).

In this way (2) the movement amount detection switch 13b is also used for movement direction detection (2), the number of switches can be reduced.
Since the operation times of switch 13b and 14a overlap, the movement direction can be determined even if the interval between the pulses generated by the operation of switch 13b is narrowed, which improves detection accuracy.
L is achieved and responsiveness is obtained.

In this embodiment, switches 13a, 13b, 1
4a is attached to the shaft 37 of the sheave 9 (2 pivots), and a part of the bracket 40 is fixed with the boom 8 (2 welded screw seats 38 (-2 bolts 39).
It is installed from the second side. Such switches 13a, 13
If the mounting structure of b and 14a is used, the gaps between these switches and the permanent magnet 24 are inevitably (2 fixed),
Errors may occur during assembly (secondarily, even if the bolts 39 fixing the bracket 40 become loose, the bracket 40 will not attach to the shaft 37).
are pivotally mounted, so that the permanent magnet 24 and the switch 13a
, 13b, 14a and the relative position of each of these switches (no deviation occurs), and depth detection (no hindrance).

In addition, as in this embodiment (2), the outer diameter of the ring 50 is
(from 2, these (2) rope slippage stoppers 41 have a special shape (-- there is no need to modify them.) Also, the arithmetic unit 16 is as shown in FIG. 7 (1 integration circuit 16
a and an arithmetic circuit 16b, and the integration circuit 16a is configured to detect when the output signal of the discriminating circuit 15 represents wire rope payout (2) every time a pulse from the movement amount detector 13 is applied. (2) When the operation of adding 1 to the stored value is performed, and the output signal of the discrimination circuit 15 represents wire rope renormalization (2),
Every time a pulse is added (-1 is subtracted (
It consists of two. In addition, the discrimination circuit 15 (second is a pulse chattering prevention circuit with a thick time constant) is built in. Upon receiving the value of S, a calculation is performed to convert the value of the integrating circuit 16a into the depth of the excavating tool.

The depth is calculated using the following formula.

Here, p: Pulse generation amount per one revolution of sheave 9. However, p26xi n: Rotation amount of sheave 9 e: Wire rope movement per one pulse m: Wire rope multiplication number and the value calculated from this is displayed. The digital display 17 and the analog display 19 are designed to display the wire rope pay-out direction (-) and the wire rope retraction direction (0) at the zero scale position (0). Since the time of positioning is set to zero, the depth of the drilling hole is displayed as -, and the height when the excavator is lifted from the ground is displayed as 10.Therefore, the display range of the analog display 19 is -. As shown in Figure 8 (2) (2. The above-mentioned digital display meter 1
7 and the analog display meter 19 are installed on the same panel surface (2 devices) of one case 21, and the case 21 is installed as shown in FIG. (- indicates power on switch 22, power supply, yp, 3
Oh, that's what I said, 1, 7. . , depth setter 32a, 3
2b, 32C1 lamps 35a, 35b, 35c, and a buzzer 36 are attached, and the arithmetic unit 16, discrimination circuit 15, digital-to-analog converter 18, unit length setter 31, comparators 33a, 33b, 33c,
The buzzer/lamp drive circuits 34a, 34b, and 34c are connected to the case 21 (-) when lowering the built-in 0-order (function of this embodiment) by free-haul operation (- means the switch 13b, 1
4a is the relationship shown in FIG. 6 (N). Since there are two
6a (-In order to add
The pulse from 3 (2) performs operation C (→addition operation) of increasing the value by (c) value, and the arithmetic circuit 16b converts the integrated value to depth, and the digital value is displayed on the digital display meter 17 (
At the same time, the analog quantity obtained by the digital-to-analog converter 18 (2) is displayed on the analog display 19 (2). Although it is difficult to do so, the depth can be read from the analog display 19 (2). Therefore, the drilling tool is lowered at high speed without applying any brake until it reaches the bottom of the hole (2). - Apply the brake to stop the drill, and in the case of an earth drill like the one in this embodiment, slowly land it on the bottom of the hole (this will be described in detail below).

In other words, whether or not the bottom of the hole has been approached can be determined by setting the previous excavation depth in the depth setter 32C, and then setting the ramp 35c at a preset depth l shallower than the previous excavation depth.
You can tell because it flashes and the buzzer 36 starts sounding. On the other hand, in the case of a packet-type continuous wall machine, as described above (2 lamps 3
When 5c flashes and the buzzer 36 starts to sound, apply the brakes to the bottom of the hole (2) to avoid unnecessary shock, temporarily stop the descent of the excavating tool, and then drop the excavating tool again using free hole operation to remove the packet. Insert your fingernail into the bottom of the hole (2 times.
At this point, it will be pulled up to the ground again, but the value of the depth setting device 32c should be changed to the depth at this time. In addition, in the case of an earth drill or a set of green packet continuous wall machine,
Normally, the Kelly bar 4 is a multi-stage telescoping type, so when each tier of Kelly bar extends, each Kelly bar (the two protrusions are caught together and the puller does not fall off).
If it is dropped in a free hole, it may collide violently with the protrusion, causing cracks and damage (Q) Therefore, if the operator does not have a depth gauge, the operator must unwind the winch rope and apply the brakes by checking the electric current. Even if a depth gauge is attached, it is necessary to memorize a depth slightly shallower than the retention part, and there is a risk of misremembering and operational errors.However, if these protrusions are Since the engagement position is fixed, if the engagement position of each stage is set in advance using the depth setters 32a and 32b, as explained above (2. The lamp 35a will flash at a depth l shallower than the engagement part. , the buzzer 36 will start sounding, so lower it slowly while applying the brakes, and when it engages (0, which can reduce the impact of The buzzer 36 stops sounding as well as indicating that the initial set depth has been passed.The same goes for the depth set by the Q depth setter 32b (the two lamps 35b and the buzzer 36 operate).

When lifting the excavation tool from the ground (2) switch 13b,
The operating time relationship of 14a is as shown in FIG.
Therefore, the discrimination circuit 15 adds a signal indicating renormalization to the integration circuit 16aE, so the integration circuit 16a performs an operation ((→subtraction operation) to subtract the value by (@value) based on the pulse (2) from the movement amount detector 13. .

Normally, the zero reference point of the depth is placed on G-L (-, but when the drilling tool passes through the zero reference point when being pulled up from the bottom of the hole, the internal calculation is (→subtraction). However, both the digital display meter 17 and the analog display meter 19 are apparently (+
) Addition operation 0 This is, for example, an absolute value of 100m(-
If the voltage value when the corresponding pulse is generated is 10V, the generated voltage when the reset button 20 is pressed is zero. The voltage of V will be generated at a depth of (-180 m) and a voltage of 10 cm will be generated, making it possible to display the above. Also, if the zero reference point of depth is placed on G-L, for example, the wire When the packet 3 is lowered to the ground with the rope 2 tensioned (2), check whether the displayed value on the digital display meter 17 is incorrect due to slippage between the wire rope 2 and the sheave 9, and check whether any error occurs. If so, press the reset button 20 to reset the arithmetic unit 16.

Also, if the wire rope 2 or sheave 9 wears out (-), the value of POD 121D of the sheave 9 shown in Fig. 3 becomes incorrect (secondly, the value of the unit length setting device 31 should be reset). The present invention is not limited to the above embodiments, and various changes and additions can be made without departing from the gist of the present invention.For example, the detectors 13 and 14 may be other switches such as proximity switches or photoelectronic switches, or semiconductors. In addition, a plurality of movement amount detector switches can be connected to the discrimination circuit 15.
In other words, this is not only the context of the embodiment (to explain in two parts, switch 131) and the switch 14a, but also the switch 14a. Operation of 13a and switch 14a
Alternatively, two switches of the movement direction detector 14 may be provided and the order of operation of each switch and the switches 13a and 13b may be determined to improve quick response. good.

As stated above (21) According to the present invention (2), the sheave (2) has a switch driving means such as a plurality of permanent magnets provided, and the non-rotating part (2) has a plurality of switches (2), the sheave rotates at a constant speed. In the case of rotating at a high speed (2), since a plurality of switches are operated at equal time intervals, an improvement in detection accuracy can be achieved. In addition, the switch for detecting the amount of movement can be used for detecting the direction of movement (two switches), so the number of switches can be reduced.This reduces installation space and reduces costs.

[Brief explanation of the drawing]

FIG. 1 is an overall side view of an earth drill to which the present invention is applied;
FIG. 2 is a block diagram showing an embodiment of the present invention, FIG. 3 is a layout diagram showing an example of a movement amount detector and a movement direction detector of the embodiment, and FIG. 5 is a pulse waveform diagram illustrating the operation of the movement amount detector of this embodiment, FIG. 6 is a pulse waveform diagram illustrating the operation of the movement direction detector of this embodiment, and FIG. 7 1% is a block diagram showing a configuration example of the arithmetic unit and discrimination circuit in the embodiment (2). Figure 8 is an external view of the display section of the embodiment. 9. Sheave,
13...Movement amount detector, 13a. 13b, 14a...Switch, 14...Movement direction detector, 24...Permanent magnet patent applicant Hitachi Construction Machinery Co., Ltd. Agent Patent attorney Tadashi Akimoto Actual agent Patent attorney Waka 1) Masaru - 314 41 No. Figure 5 Figure 6 Figure 7 31 3620 23 Procedural amendment (voluntary) January 31, 1980 Director General of the Patent Office 1 Indication of the case 1988 Patent application No. 88792 2 Title of the invention Depth for hole-forming excavator Detection device 3, relationship with the amended person case Patent applicant address: 2-10 Uchikanda-chome, Chiyoda-ku, Tokyo Name (specialty (552) Hitachi Construction Machinery Co., Ltd. Representative Bunpei Nishimoto 4 Representative Director 6 , Subject of amendment Column 7 of detailed explanation of the invention in the specification,
Contents of the amendment Correct “protrusions together” in line 2 on page 18 of the specification to “protrusions together” 0 Procedural amendment (spontaneous) Cow 1, Indication of the case Patent application No. 88792 of 1988 2 Title of the invention Depth detection device for hole-forming excavator 3, relationship with the case of the person making the correction Patent applicant address: 2-10 Uchikanda-chome, Chiyoda-ku, Tokyo Name Meika (552) Hitachi Construction Machinery Co., Ltd. Representative Bunpei Nishimoto 4. Agent

Claims (1)

[Scope of Claims] 1. In a depth detection device C2 for a hole drilling machine in which a drilling tool is supported by a wire rope (2), a non-rotating part (-) near a sheave that rotates due to movement of the wire rope When a plurality of switches for detecting the amount of wire rope movement and the sheave are provided at equal intervals in two circumferential directions ('), and the sheave is rotating at a constant speed, switch driving means for operating at intervals;
The switch driving means (including a moving direction detection switch that operates to detect the moving direction of the wire rope;
A depth detection device for a hole-forming excavator, characterized in that at least one of the movement amount detection switches also serves as a movement direction detection switch. 2. A patent characterized in that the operating times of the movement detection switch, which also serves as a movement direction detection switch, and the movement direction detection switch, 1 and 2 overlap, and have a slight deviation. A depth detection device for a hole-forming excavator according to claim 1.