CN102613013B

CN102613013B - Circuit structure with extension rod electric tool

Info

Publication number: CN102613013B
Application number: CN 201210064282
Authority: CN
Inventors: 王刚; 张锦飞
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2012-03-13
Filing date: 2012-03-13
Publication date: 2013-07-31
Anticipated expiration: 2032-03-13
Also published as: CN102613013A

Abstract

The invention discloses a circuit structure with an extension rod electric tool. The circuit structure comprises a motor, a power supply, a first power switch and a second power switch, wherein the power supply comprises a first power line and a second power line; the first power line is electrically connected with a second contact of the second power switch; the second power line is electrically connected with the motor; a first contact of the second power switch is electrically connected with a first joint of the first power switch; and a second joint of the first power switch is electrically connected with the motor. According to the scheme of the invention, without adding cost of a hardware circuit, the switching of a control switch under two work modes of a mechanical motor tool without the extension rod and with the extension rod is realized; a universal splicing socket is adopted as a splicing structure among the extension rod, the host machine and the power supply; the interchanging suitability is excellent; without adding other control circuit, the switching of the control switch is performed; the circuit structure is suitable for large-scope operation; the circuit structure is simple and is easily realized; and under the action of a fool-proofing protecting circuit, safety and reliability are brought for the operation.

Description

The circuit structure of band extension rod electric tool

Technical field

The present invention relates to a kind of trimmer, relate in particular to a kind of direct current trimmer that the flowers, plants and trees branches and leaves are pruned that is used for, belong to the graden machine technical field.

Background technology

Present widely used direct current pruner, high efficiency, easy to carry, its structure is: have housing, in enclosure interior motor and transmission mechanism are installed, hull outside is provided with gauge tap, the housing front end is provided with blade, and blade is made up of knife section and fixed blade, and transmission mechanism drives knife section, the housing rear end connects the detachable battery bag, simultaneously, have the wider space of manipulating, between power brick and host shell, set up telescopic extension rod for making pruner, but, the connected structure of the connected structure of its extension rod and housing and power brick and housing is inconsistent, when power brick and extension rod are replaced, need add coupling toward contact between the two like this, control circuit, increase cost, the exchange suitability is poor.

Summary of the invention

The objective of the invention is in order to overcome defective of the prior art, a kind of circuit structure with the extension rod electric tool is provided, connected structure exchange suitability between its extension rod, main frame, the power brick is good, need not to increase other control circuits, can carry out the switching of gauge tap, be suitable for operation on a large scale.

For solving the problems of the technologies described above, the invention provides a kind of circuit structure with the extension rod electric tool, it includes motor, be used for power supply to the motor power supply, first power switch and second source switch that power supply is controlled to motor power supply, it is characterized in that: described power supply includes first power line on second contact that can be connected electrically to the second source switch and is connected electrically to second source line on the motor, first contact of described second source switch is connected electrically on first contact of described first power switch, and second contact of described first power switch is connected electrically on the described motor.

Described first power switch is the switch of a band normally-open normally-close contact.

Described first power switch also comprises one the 3rd contact, and described first power switch can switch between its first contact and the 3rd contact.

Also comprise a fool proof holding circuit, comprise the PCB that the described motor of control opens and closes in the described fool proof holding circuit, described PCB is electrically connected with second contact, the 3rd contact of described first power switch respectively.

The 3rd contact of described first power switch is connected electrically on second contact of described second source switch.

Described PCB gathers second contact at the described first power switch two ends, the electromotive force between the 3rd contact, and carries out signal relatively, if potential-free is poor, then described PCB output signal is cut off described motor circuit.

The beneficial effect that the present invention reached:

The solution of the present invention is not increasing under the hardware circuit condition of cost, can realize the no extension rod of mechanical electric tool and the switching of being with gauge tap under two kinds of mode of operations of extension rod, connected structure between extension rod, main frame, the power supply adopts general plug receptacle, the exchange suitability is good, need not to increase other control circuits, can carry out the switching of gauge tap, be suitable for operation on a large scale, circuit structure is simple, is easy to realize.The fool proof holding circuit makes machine operation safer, reliable.

Description of drawings

Fig. 1 is the electric tool structure schematic diagram of an embodiment;

Fig. 2 is the assembling schematic diagram of Fig. 1;

Fig. 3 is the electric tool band extension rod schematic diagram of Fig. 1;

Fig. 4 is the assembling schematic diagram of Fig. 3;

Fig. 5 is the circuit diagram of Fig. 1, Fig. 2;

Fig. 6 is the circuit diagram of Fig. 3, Fig. 4;

Fig. 7 is the circuit diagram of Fig. 5 band fool proof protection;

Fig. 8 is the circuit diagram of Fig. 6 band fool proof protection.

Embodiment

Below in conjunction with accompanying drawing the present invention is further described.Following examples only are used for technical scheme of the present invention more clearly is described, and can not limit protection scope of the present invention with this.

Embodiment 1

Being used for a concrete electric tool direct current pruner with circuit structure of the present invention is example, when not using with the state of extension rod, main frame 1 is directly inserted power brick 3, as shown in Figure 1 and Figure 2, main frame 1 links to each other with power brick 3, motor M is located in the main frame 1, and power brick 3 directly is inserted on the main frame 1 and provides operation power for pruner.Circuit structure as shown in Figure 5, during original state, the host switch i.e. first power switch K1 is in the switch normally off (in the present embodiment, the first power switch K1 is the switch of a band normally-open normally-close contact), when promptly the first power switch K1 is in the first contact a, circuit disconnects, and motor M is not worked; When the first power switch K1 is triggered to end-state position the 3rd contact c by trigger, circuit communication, motor M work.

When the state of band extension rod used, as shown in Figure 3, Figure 4, main frame 1 linked to each other with extension rod 2, and power brick 3 is inserted on the extension rod 2.Extension rod 2 and the link of main frame 1 are made the connected structure identical with power brick 3, making extension rod 2 need not add other supplementary structure just can directly be connected with main frame 1, power brick 3 sockets of extension rod 2 tail ends are identical with power brick 3 outlet structure on the main frame 1, need not add other supplementary structure and just power brick 3 can be installed directly.

Circuit structure as shown in Figure 6, power brick 3 includes the first power line L1 on the second contact e that can be connected electrically to second source K switch 2 and is connected electrically to second source line L2 on the motor M, the first contact d of second source K switch 2 is connected electrically on the first contact a of the first power switch K1, and the second contact b of the first power switch K1 is connected electrically on the motor M.

When extension rod 2 inserts main frame 1, second source K switch 2 first contact d on the extension rod are electrically connected with the first contact a on the first power switch K1, make the control circuit conducting, the first power switch K1 is in the state of electrical communication all the time, and extension rod second source K switch 2 is worked.Start the machine by the second source K switch 2 on the extension rod.The keying of circuit comprises following several state:

1, second source K switch 2 does not have closure, and then circuit disconnects, and machine can not be worked;

2, second source K switch 2 closures, the first power switch K1 is in the original state position during the first contact a, circuit communication, machine works;

3, second source K switch 2 closures, and when by trigger the first power switch K1 on the main frame being triggered to end-state position the 3rd contact c, then circuit disconnects, and machine is not worked.

For increasing being connected between main frame 1 and the extension rod 2, preferably, main frame 1 can be fixed by assisting grab with extension rod 2.

In other embodiments, extension rod can also be telescopic rod member, so that the operator is adjusted to the extension rod of different length as required except being the rod member of regular length.

Embodiment 2

On the circuit base of embodiment 1, increase the closed first power switch K1, second source K switch 2 earlier, power brick 3 is inserted in the back, the fool proof holding circuit that main frame 1 can not start, as Fig. 7, shown in Figure 8, all the other are identical with embodiment 1.The fool proof holding circuit comprises the PCB4 that is located at the keying of main frame internal control machine; PCB4 is connected with the second contact b, the 3rd contact c of the first power switch K1 by holding wire; gather the voltage signal at the second contact b, the 3rd contact c place respectively, be in fool proof guard mode or normal operating conditions according to circuit signal control circuit loop.

As shown in Figure 7; for not with the circuit of extension rod; if the closed first power switch K1 of elder generation; the first power switch K1 is triggered to the 3rd contact c; the second contact b then; the 3rd contact c is by short circuit; if insert power brick 3 this moment; PCB4 can judge the second contact b; potential-free is poor between the 3rd contact c, and the loop will be prevented that the motor M in the main frame 1 from delaying work by the PCB tripping protection; meet accident; if unclamp the first power switch K1 this moment, PCB4 can judge the second contact b; between the 3rd contact c electrical potential difference is arranged, the loop will be connected by PCB4; protection will be disengaged this moment, but the motor M operate as normal.

As shown in Figure 8, circuit for the band extension rod, if the closed second source K switch 2 of elder generation, power brick 3 is inserted in the back, and then under the PCB4 effect, machine will be in the fool proof state, can't start, unclamp second source K switch 2 this moment, and machine will switch to normal operating conditions, and motor M just can normally start work.

The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvement and distortion, these improvement and distortion also should be considered as protection scope of the present invention.

Claims

1. circuit structure with the extension rod electric tool, it includes motor, be used for the power supply to the motor power supply, first power switch and the second source switch that power supply is controlled to the motor power supply, it is characterized in that: described power supply includes first power line on second contact that can be connected electrically to the second source switch and is connected electrically to second source line on the motor, first contact of described second source switch is connected electrically on first contact of described first power switch, and second contact of described first power switch is connected electrically on the described motor;

Described first power switch also comprises one the 3rd contact, and described first power switch can switch between its first contact and the 3rd contact;

2. the circuit structure of band extension rod electric tool according to claim 1 is characterized in that, described first power switch is the switch of a band normally-open normally-close contact.

3. the circuit structure of band extension rod electric tool according to claim 1 is characterized in that, the 3rd contact of described first power switch is connected electrically on second contact of described second source switch.

4. the circuit structure of band extension rod electric tool according to claim 1, it is characterized in that described PCB gathers second contact at the described first power switch two ends, the electromotive force between the 3rd contact, and carry out signal relatively, if potential-free is poor, then described PCB output signal is cut off described motor circuit.