CN2441250Y - Overload protector for concrete boring apparatus - Google Patents
Overload protector for concrete boring apparatus Download PDFInfo
- Publication number
- CN2441250Y CN2441250Y CN 00251528 CN00251528U CN2441250Y CN 2441250 Y CN2441250 Y CN 2441250Y CN 00251528 CN00251528 CN 00251528 CN 00251528 U CN00251528 U CN 00251528U CN 2441250 Y CN2441250 Y CN 2441250Y
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- CN
- China
- Prior art keywords
- circuit
- overload
- output
- protective device
- overload protective
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to an overload protector for a concrete boring machine, which is composed of a sample circuit, a comparison circuit, a trigger circuit, an amplifying circuit and a switching circuit. The voltage sampled signal which is proportional with the strength of the current of a motor of the concrete boring machine is acquired by the sample circuit, and the voltage sampled signal is compared with a set value of the comparison circuit. When the sampled signal is bigger than the set value, the comparison circuit outputs an overload single which passes through the triggering circuit and the amplifying circuit to actuate the switching circuit to shut off a power supply of the motor. Therefore, the aim of overload protection is reached. The utility model has the advantages of sensitive overload reaction, easy reset, convenient operation and high reliability. Once the fault of overload is eliminated, the concrete boring machine can immediately and normally work.
Description
The utility model relates to the overload protection arrangement of concrete drilling machine.
Concrete drilling machine often is in overload in the course of the work, if do not take effective protection measure, can cause burning out motor, damage drill bit and gear.Usually the overload protection arrangement that adopts has: 1. cartridge fuse, and it is simple in structure, but the fuse failure time is long, and the overload reaction is insensitive, and the protection effect is undesirable, and cartridge fuse is changed frequently.2. safety pin, promptly the drilling machine output shaft is connected with drill bit by sleeve, is connected with straight pin between sleeve and the output shaft, and when overload took place, overload torque was cut off straight pin, made the disengaging of output shaft and sleeve, thereby played overload protective function.Though this structure is simple, because material, the heat treatment parameter of straight pin are difficult to control, reliability is low, and straight pin is changed frequent.3. friction plate.This structure is in drilling machine gear reduction box sheet gear one side one group of friction plate to be installed, and tightens friction plate according to drilling machine nominal torque value with deciding torque wrench.When overload took place, friction plate and gear face slided, and the gear transmission torque capability is significantly reduced, thereby play overload protective function.The advantage of this structure is simple in structure, and overload is quick on the draw, but friction plate is easy to wear, and friction back overload protection function significantly reduces, and more renewal of facing renewal need be taken complete machine apart and use specific purpose tool, specification requirement height, general user to be difficult to change.
The purpose of this utility model provides the concrete drilling machine overload protective device that a kind of overload is quick on the draw, easily recovers.
The utility model concrete drilling machine overload protective device is made up of sample circuit, comparison circuit, amplifying circuit and switching circuit; Sample circuit is that obtain to be compared with set point proportional voltage sampling signal of concrete drilling machine current of electric intensity and comparison circuit; sampled signal is comparison circuit output overloading signal during greater than set point; by amplifying circuit driving switch circuitry cuts current of electric, thereby reach the purpose of overload protection.
Because the utility model overload protective device adopts electronic device, overload is quick on the draw, can be at 0.1 second internal cutting off current of electric; and switching circuit easily resets, and the overload reason is once eliminating, and rig is operate as normal immediately; need not renewal part can resume work, easy to use, the reliability height.
Fig. 1 is the utility model overload protective device circuit block diagram.
Fig. 2 is the utility model electrical schematic diagram.
Below in conjunction with accompanying drawing the utility model is described in detail:
By shown in Figure 2, the 220V alternating current is through transformer T
1, rectifier bridge V
12, filter capacitor C
2, three terminal regulator V
9Transformation, rectification, filtering, the voltage stabilizing circuit formed provide 5V DC power supply for the utility model.
Sample circuit is by current transformer T
2, resistance R
1, rectifier bridge V
11Form T
2Two inputs are serially connected on the circuit of motor M R
1Be connected in parallel on T
2Two outputs between, convert single phase series motivated motor M current strength variable signal to R
1The ac voltage signal at two ends obtains the direct voltage sampled signal through rectification again.
Comparison circuit is by bleeder circuit and NAND gate N
1Form, bleeder circuit is by R
7, R
8Form NAND gate N
1Two inputs are arranged, be connected in parallel on R
7And R
8Between, the sampled signal that sample circuit obtains is through unidirectional diode V
18With R
7Link to each other R
8One end ground connection, R
8Two ends filter capacitor C in parallel
1Work as R
8On voltage greater than N
1Threshold voltage the time, N
1Output low level overload signal, otherwise output high level.
Circuits for triggering are by two NAND gate N with two inputs
2, N
3Form N
2Input and N
1Output links to each other, N
3Input and N
2Output link to each other N
2Another input and N
3Output links to each other, N
3Another input be connected on charging circuit R
9And C
3Between, R
9One termination 5V power supply, C
3One end ground connection, C
3Two ends reset switch F in parallel.Under initial condition, N
2, N
3Output is output low level, high level respectively.Work as N
1During the output low level overload signal, N
2The output high level, N
3Output low level makes N
2An input that is attached thereto is also handed over into low level, with N
2The high level locking of output.After the overload reason is eliminated, press the knob F that resets, N
3The output high level makes N
2An input be high level, N
2Output low level restPoses.
The overload display circuit is by Light-Emitting Diode V
19, triode V
17Form.N
3Output pass through resistance R
18With V
17Base stage links to each other, V
19Be connected on 5V power supply and V
17Between the emitter.Work as N
2During output high level overload signal, N
3Output low level, V
17Conducting, V
19Conducting is luminous, shows overload signal.
Amplifying circuit is by triode V
16, optical coupling pipe V
14, triode V
15Form N
2Output passes through resistance R
10With V
16Base stage links to each other, V
16, V
14, V
15Form three-stage amplifier.
Switching circuit is by rectifier bridge V
13And current-limiting resistance R
18Form V
13Input and the controllable silicon V on the motor M alignment circuit
20Source electrode links to each other, and the other end passes through resistance R
18And triggering diode V
10Link to each other with the controllable silicon grid.V
13Two outputs respectively with amplifying circuit V
15Collection, emitter-base bandgap grading link to each other.Work as N
2During output high level overload signal, through V
16, V
14, V
15Amplify, make V
15Conducting, V
13Controllable silicon source electrode ac high-voltage is applied on the grid, makes controllable silicon V
20End, cut off the electric current of motor M, can prevent that motor M from burning out because of electric current is excessive or aging.
Current display circuit by four respectively by current-limiting resistance R
2, R
3, R
4, R
5With Light-Emitting Diode V
5, V
6, V
7, V
8The branch road of series connection is formed, and the direct voltage sampled signal that sample circuit obtains is by voltage-stabiliser tube V
1Be applied to resistance one end of each branch road, each branch road light-emitting diode is by the resistance R that rations the power supply
6Ground connection, the resistance terminal serial connection clamp diode V of adjacent legs
2, V
3, V
4When sample circuit has sampled signal output, Light-Emitting Diode V
5, V
6, V
7, V
8Conducting is luminous successively along with the increase of sampled signal, thereby can show the intensity of current of electric.
The utility model also comprises a buffer circuit, by delay circuit IC
1And relay J
1Form IC
1Be 555 time-base circuits, pin 1 ground connection, pin 4,8 connects the 5V power supply, and pin 2,6 is attempted by charging circuit R
21And C
7Between, R
21One terminates at N
3Output, C
7One end ground connection, pin 3 passes through relay J
1Coil links to each other with the 5V power supply.Relay J
1A pair of normally opened contact K
1Be connected in parallel on by capacitor C
5, C
6And resistance R
15, R
16, R
17, R
19, R
22And band switch (R
23, R
24, R
25, R
26) form a resistance R of connecting with band switch in the controllable silicon RC phase-shift trigger circuit
22Two ends.When drilling machine is started shooting moment, because relay J
1Contact K
1Disconnect, the RC constant of controllable silicon RC phase-shift trigger circuit is big, and the phase shift time is long, and the controllable silicon ON time is short, and output voltage is low; N meanwhile
3The output high level passes through R
21To C
7Charging after after a while, is worked as C
7On level reach IC
1Threshold voltage the time, IC
1Pin 3 output low levels, relay J
1Coil gets electric, makes K
1Adhesive, R
22Short circuit makes the RC constant of controllable silicon RC phase-shift trigger circuit reduce, and the phase shift time is short, controllable silicon conducting output HIGH voltage, thus solved the impact failure that start moment single phase alternating current (A.C.) series excited machine M produces controllable silicon.R
21Two ends also in parallel one by resistance R
20With diode V
22The repid discharge loop of forming.When current overload, N
3Output low level, C
7Pass through R
20, R
21Discharge rapidly, IC
1Return initial condition, pin 3 output high level, relay J
1Contact K
1Disconnect.
Claims (7)
1, a kind of concrete drilling machine overload protective device; it is characterized in that it is made up of sample circuit, comparison circuit, amplifying circuit, switching circuit; sample circuit is that obtain to be compared with setting voltage value proportional voltage signal of concrete drilling machine current of electric intensity and comparison circuit; sampled signal is during greater than setting voltage value; comparison circuit output overloading signal; after amplifying circuit amplifies, driving switch circuitry cuts current of electric.
2, overload protective device according to claim 1; it is characterized in that described amplifying circuit is made up of triode; described switching circuit is made up of rectification circuit and current-limiting resistance; the ac input end of rectification circuit is connected in respectively between the controllable silicon source electrode and grid of drilling machine alignment circuit, and the dc output end of rectification circuit is connected in respectively between the triode collection, emitter-base bandgap grading of amplifying circuit.
3, overload protective device according to claim 1 is characterized in that it also comprises circuits for triggering, with the overload signal locking of comparison circuit output; Circuits for triggering are provided with reset button.
4, overload protective device according to claim 1; it is characterized in that it also has a buffer circuit; form by delay circuit and relay; relay coil is connected on the output of delay circuit; the a pair of normally opened contact of relay is connected on the band switch branch road in the controllable silicon RC phase-shift trigger circuit, the two ends of normally opened contact resistance R in parallel
22, the RC constant of the moment of starting shooting is big, and the controllable silicon output voltage is low; After delay circuit time-delay a period of time, relay contact adhesive, resistance R
22Short circuit, the RC constant reduces, controllable silicon output voltage height.
5,, it is characterized in that it also has an overload display circuit, during comparison circuit output overloading signal, is shown by lumination of light emitting diode according to claim 1 or 2 or 3 or 4 described overload protective devices.
6, overload protective device according to claim 5 is characterized in that it also has a current display circuit, is made up of several light-emitting diodes, and conducting is luminous successively with the sampled signal increase for each light-emitting diode.
7, overload protective device according to claim 6 is characterized in that it also has a DC power supply circuit, is made up of transformation, rectification, filtering, voltage stabilizing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00251528 CN2441250Y (en) | 2000-09-07 | 2000-09-07 | Overload protector for concrete boring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00251528 CN2441250Y (en) | 2000-09-07 | 2000-09-07 | Overload protector for concrete boring apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2441250Y true CN2441250Y (en) | 2001-08-01 |
Family
ID=33609428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00251528 Expired - Fee Related CN2441250Y (en) | 2000-09-07 | 2000-09-07 | Overload protector for concrete boring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2441250Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107642338A (en) * | 2017-08-22 | 2018-01-30 | 李少帅 | It is a kind of to build attachment means of the puncher with overload protection function |
-
2000
- 2000-09-07 CN CN 00251528 patent/CN2441250Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107642338A (en) * | 2017-08-22 | 2018-01-30 | 李少帅 | It is a kind of to build attachment means of the puncher with overload protection function |
| CN107642338B (en) * | 2017-08-22 | 2019-01-11 | 嘉兴敏惠汽车零部件有限公司 | A kind of attachment device of the building puncher with overload protection function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |