CN212258820U - Speed regulation circuit and electric tool - Google Patents
Speed regulation circuit and electric tool Download PDFInfo
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- CN212258820U CN212258820U CN202021054577.8U CN202021054577U CN212258820U CN 212258820 U CN212258820 U CN 212258820U CN 202021054577 U CN202021054577 U CN 202021054577U CN 212258820 U CN212258820 U CN 212258820U
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Abstract
The embodiment of the utility model discloses speed governing circuit and electric tool. This speed governing circuit for carry out the speed governing to the motor, include: the resistor adjusting module, the filter circuit and the silicon controlled rectifier; the controllable silicon is connected in series with a power supply loop of the motor; the first end of the resistance adjusting module is connected with the output end of the speed regulating circuit, and the second end of the resistance adjusting module is connected with the input end of the speed regulating circuit through a capacitor; the first end of the filter circuit is connected with the second end of the resistance adjusting module, and the second end of the filter circuit is connected with the control end of the controllable silicon; the first end of the controllable silicon is connected with the output end of the speed regulating circuit, and the second end of the controllable silicon is connected with the input end of the speed regulating circuit. The control end of the silicon controlled rectifier is connected with the filter circuit to block the high-frequency interference signal, so that the speed regulating circuit can inhibit the high-frequency interference signal, the speed regulating circuit has the capability of resisting high-frequency interference, and the problem of inaccurate speed regulation caused by the interference of the high-frequency signal on the conduction time of the silicon controlled rectifier in the prior art is solved.
Description
Technical Field
The embodiment of the utility model provides a relate to the electric tool technique, especially relate to a speed governing circuit and electric tool.
Background
In electric tools such as sanding machines, the rotating speed of a motor in the electric tool needs to be adjusted according to actual conditions. Currently, the rotation speed is mostly adjusted by adopting a multi-gear speed adjusting switch.
In some products, the following drawbacks exist: the speed regulating circuit is not designed with dead time for starting the negative half cycle of the alternating current, so that electromagnetic interference exists after the zero crossing point due to the fact that the bidirectional thyristor is directly started after the zero crossing point of the alternating current, and current fluctuation is large.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a speed governing circuit and electric tool to improve speed adjusting device's interference killing feature.
In a first aspect, an embodiment of the present invention provides a speed regulation circuit for speed regulation is performed to a motor, including: the resistor adjusting module, the filter circuit and the silicon controlled rectifier; the controllable silicon is connected in series with a power supply loop of the motor;
the first end of the resistance adjusting module is connected with the output end of the speed regulating circuit, and the second end of the resistance adjusting module is connected with the input end of the speed regulating circuit through a capacitor;
the first end of the filter circuit is connected with the second end of the resistance adjusting module, and the second end of the filter circuit is connected with the control end of the controllable silicon;
the first end of the controllable silicon is connected with the output end of the speed regulating circuit, and the second end of the controllable silicon is connected with the input end of the speed regulating circuit.
Optionally, the filter circuit comprises a first filter element and a second filter element arranged in series, wherein,
the first end of the first filter element is used as the first end of the filter circuit, the second end of the first filter element is connected with the first end of the second filter element, and the second end of the second filter element is used as the second end of the filter circuit.
Optionally, the first filter element is a magnetic bead.
Optionally, the second filter element is a first bidirectional trigger diode.
Optionally, the resistance adjustment module includes a first variable resistor, a second variable resistor, and a first resistor; the first variable resistor and the second variable resistor are arranged in parallel;
a first end of the first resistor is used as a first end of the resistance adjusting module, and a second end of the first resistor is respectively connected with a first end of the first variable resistor and a first end of the second variable resistor;
a second end of the first variable resistor and a second end of the second variable resistor are connected and then serve as a second end of the resistance adjusting module;
and the sliding end of the first variable resistor and the sliding end of the second variable resistor are connected and then used as the resistance value adjusting end of the resistance adjusting module.
Optionally, the power supply further comprises a second diac and a third diac;
the first end of the second bidirectional trigger diode is connected with the first end of the third bidirectional trigger diode;
a second end of the second bidirectional trigger diode is connected with a second end of the first resistor;
and the second end of the third bidirectional trigger diode is connected with the input end of the speed regulating circuit.
Optionally, the device further comprises a speed regulation switch;
the first end and the second end of the speed regulating switch are correspondingly connected with the input end and the output end of the speed regulating circuit; and the control end of the speed regulation switch is connected with the resistance value regulation end of the resistance regulation module.
Optionally, when the first end and the second end of the speed regulation switch are in a conducting state, the speed regulation circuit is in the highest gear;
when the first end and the second end of the speed regulating switch are in a disconnected state, the speed regulating switch adjusts the gear by changing the resistance value of the resistance adjusting module.
In a second aspect, an embodiment of the present invention further provides an electric tool, including a power supply circuit, a motor, and a speed adjusting circuit according to any embodiment of the present invention; the power supply circuit has a first output terminal and a second output terminal;
one end of the motor is connected with the output end of the speed regulating circuit, and the other end of the motor is connected with the first output end of the power supply circuit;
and the input end of the speed regulating circuit is connected with the second output end of the power supply circuit.
Optionally, the system further comprises a bus capacitor and a power control switch;
the bus capacitor is connected in parallel between a first output end and a second output end of the power supply circuit;
and the first end of the power supply control switch is connected with the second output end of the power supply circuit, and the second end of the power supply control switch is connected with the input end of the speed regulating circuit.
The embodiment of the utility model provides a speed governing circuit adjusts the resistance of speed governing circuit through resistance adjusting module, and through the resistance that changes resistance adjusting module, the realization is adjusted the conduction angle of silicon controlled rectifier to change the voltage of exporting to the motor both ends, realize carrying out the speed governing to the motor. The control end of the silicon controlled rectifier is connected with the filter circuit, and the impedance characteristic of the filter circuit per se blocks the high-frequency interference signal, so that the speed regulating circuit has the function of inhibiting the high-frequency interference signal, the speed regulating circuit provided by the embodiment has the capacity of resisting high-frequency interference, and the problem of inaccurate speed regulation caused by the fact that the conduction time of the silicon controlled rectifier is interfered by the high-frequency signal in the prior art is solved.
Drawings
Fig. 1 is a schematic structural diagram of a speed regulation circuit provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another speed regulation circuit provided in the embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electric tool according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is the embodiment of the utility model provides a structural schematic diagram of a speed governing circuit, this speed governing circuit can be applied to among the electric tool to adjust the rotational speed of motor among the electric tool. Referring to fig. 1, the throttle circuit 10 includes: the resistance adjusting module 110, the filter circuit 120 and the thyristor 130; the controllable silicon 130 is connected in series with a power supply loop of the motor;
the first end of the resistance adjusting module 110 is connected with the output end Out of the speed regulating circuit, and the second end of the resistance adjusting module 110 is connected with the input end In of the speed regulating circuit through a capacitor C1;
the first end of the filter circuit 120 is connected to the second end of the resistance adjusting module 110, and the second end of the filter circuit 120 is connected to the control end of the thyristor 130;
the first end of the controllable silicon 130 is connected with the output end Out of the speed regulating circuit, and the second end of the controllable silicon 130 is connected with the input end In of the speed regulating circuit.
Specifically, the resistance adjusting module 110 is used to adjust the resistance value of the speed adjusting circuit 10, and a change in the resistance value of the resistance adjusting module 110 causes a change in the conduction angle of the thyristor 130, thereby causing a change in the output voltage of the speed adjusting circuit.
The resistivity and the inductance of the filter circuit 120 can follow the frequency change of the signal. When the high-frequency interference signal exists in the speed regulating circuit 10, the filter circuit 120 has a large resistance value, and can disconnect the thyristor 130 from the resistance regulating module 110, so that the high-frequency interference signal cannot form a current loop through the resistance regulating module 110 and the thyristor 130, that is, the high-frequency interference signal cannot form an additional current loop through the thyristor 130, and thus, abnormal change of the conduction time of the thyristor 130 can be avoided. Meanwhile, when the speed regulating circuit 10 is in a high-frequency common mode interference state, the impedance of the filter circuit 120 is large, so that the capacitor C1 is charged in a delayed manner, and the dead time of the thyristor 130 is increased, so that the problem of electromagnetic interference caused when the speed regulating circuit 10 is started in a negative half cycle is solved.
The controllable silicon 130 is connected with the resistance adjusting module 110 through the filter circuit 120, and when the resistance value of the resistance adjusting module 110 changes, the resistance adjusting module 110 changes the conduction angle of the controllable silicon 130 through the filter circuit 120, so that the voltage output by the speed adjusting circuit to the motor is changed, and the stepless speed adjustment of the motor is realized. In one embodiment, the thyristor 130 is a BTA08 type thyristor.
The embodiment of the utility model provides a speed governing circuit adjusts speed governing circuit 10's resistance through resistance adjusting module 110, and through the resistance that changes resistance adjusting module 110, the realization is adjusted silicon controlled 130's conduction angle to change the voltage of loading to motor both ends, realize carrying out the speed governing to the motor. The control end of the thyristor 130 is connected with the filter circuit 120, and the impedance characteristic of the filter circuit 120 forms a barrier to the high-frequency interference signal, so that the speed regulating circuit 10 can inhibit the high-frequency interference signal, the speed regulating circuit 10 provided by the embodiment has the capability of resisting the high-frequency interference, and the problem of inaccurate speed regulation caused by the interference of the high-frequency signal on the conduction time of the thyristor 130 in the prior art is solved.
Optionally, fig. 2 is a schematic structural diagram of another speed adjusting circuit provided by the embodiment of the present invention, on the basis of the above-mentioned embodiment, referring to fig. 2, the filter circuit 120 includes a first filter element and a second filter element which are arranged in series, a first end of the first filter element is used as a first end of the filter circuit, and a second end of the second filter element is used as a second end of the filter circuit.
Specifically, first filter element can filter high frequency interference signal, and the second filter element can filter low frequency interference signal, constitutes filter circuit through establishing ties first filter element and second filter element for filter circuit can filter high frequency interference signal and low frequency interference signal, realizes full frequency channel filtering.
In one embodiment, the first filter element is a bead L1. The magnetic bead L1 has a good frequency response, which is equivalent to a series connection of a resistor and an inductor. The reactance of the L1 equivalent inductor increases with increasing frequency, so that the impedance value thereof also increases with increasing frequency, and therefore the bead L1 has higher impedance to the high-frequency signal, i.e. the bead L1 has stronger suppression capability only to the high-frequency signal. Therefore, the magnetic bead L1 is connected to the control end of the thyristor 130, so that the influence of the high-frequency interference signal on the thyristor 130 can be suppressed, specifically, when there is a high-frequency common-mode interference signal, the high-frequency common-mode interference signal is blocked by the magnetic bead L1 and cannot enter the thyristor 130, and the influence of the high-frequency interference signal on the conduction time of the thyristor 130 is avoided.
In one embodiment, the magnetic bead L1 is specifically a patch magnetic bead. The paster type magnetic bead is low in cost and small in occupied space, so that the size of a circuit board in the speed regulating circuit 10 and the installation of other electronic components cannot be influenced by the paster type magnetic bead, and the speed regulating circuit has the advantage of being easy to achieve.
In one embodiment, the second filter element is a first bidirectional trigger diode VD 1. The first end of the first bidirectional trigger diode VD1 is connected with the second end of the filter circuit 120, and the second end of the first bidirectional trigger diode VD1 is connected with the control end of the controllable silicon 130.
Specifically, the first bidirectional trigger diode VD1 is connected in series with the magnetic bead L1 and then connected to the control terminal of the thyristor 130, because the first bidirectional trigger diode VD1 can suppress the low-frequency interference signal. With reference to the foregoing embodiment, in the speed regulating circuit 10 provided in this embodiment, the first diac VD1 suppresses the low-frequency interference signal, and the magnetic bead L1 suppresses the high-frequency interference signal, so that the full-band anti-interference capability of the speed regulating circuit 10 is improved.
Optionally, with continued reference to fig. 2, the resistance adjustment module 110 includes a first variable resistor WK1, a second variable resistor WK2, and a first resistor R1; the first variable resistor WK1 is arranged in parallel with the second variable resistor WK 2;
a first end of the first resistor R1 is used as a first end of the resistance adjustment module 110, and a second end of the first resistor R1 is respectively connected with a first end of the first variable resistor WK1 and a first end of the second variable resistor WK 2;
a second end of the first variable resistor WK1 and a second end of the second variable resistor WK2 are connected to serve as a second end of the resistance adjusting module 110;
the sliding end of the first variable resistor WK1 and the sliding end of the second variable resistor WK2 are connected to serve as a resistance value adjusting end of the resistance adjusting module 110.
Specifically, by arranging the first variable resistor WK1 and the second variable resistor WK2 in parallel, the resistance value adjusting precision of the resistance adjusting module 110 can be improved, so that the speed adjusting circuit 10 can realize accurate speed adjustment.
The sliding end of the first variable resistor WK1 and the sliding end of the second variable resistor WK2 are connected to serve as a resistance value adjusting end of the resistance adjusting module 110, and are used for being connected with a gear adjusting device of the speed adjusting circuit 10, so that the speed adjusting circuit 10 can change the conduction angle of the thyristor 130 by adjusting the resistance values of the first variable resistor WK1 and the second variable resistor WK2, and the speed of the motor is adjusted.
Optionally, with continued reference to fig. 2, the speed regulation circuit 10 further includes a second diac VD2 and a third diac VD 3;
the first end of the second bidirectional trigger diode VD2 is connected with the first end of the third bidirectional trigger diode VD 3;
the second end of the second bidirectional trigger diode VD2 is connected with the second end of the first resistor R1;
the second end of the third diac VD3 is connected to the input terminal In of the speed regulation circuit.
In this embodiment, the second bidirectional trigger diode VD2 and the third bidirectional trigger diode VD3 are provided, so that the interference rejection capability of the speed regulating circuit 10 can be further improved.
Optionally, with continued reference to fig. 2, the speed regulation circuit 10 further includes a speed regulation switch S-WK 1;
the first end and the second end of the speed regulating switch S-WK1 are correspondingly connected with the input end In and the output end of the speed regulating circuit; the control end of the speed regulation switch S-WK1 is connected with the resistance value regulation end of the resistance regulation module 110.
Specifically, the speed regulation switch S-WK1 is provided with a plurality of gears for a user to select, and the control terminal of the speed regulation switch S-WK1 is connected to the resistance value adjusting terminal of the resistance adjusting module 110, so that the user can regulate the speed of the motor by selecting the gear of the speed regulation switch S-WK 1.
Specifically, the control end of the speed regulation switch S-WK1 can adjust the resistance of the resistance adjustment module 110, so that each gear of the speed regulation switch S-WK1 corresponds to a resistance, and different resistances correspond to different adjustment ranges of the conduction angle of the thyristor 130, so that a motor with different voltage values is correspondingly output by different gears of the speed regulation switch S-WK1, and the rotation speed of the motor is adjusted.
Optionally, when the first end and the second end of the speed regulation switch S-WK1 are in a conducting state, the speed regulation circuit 10 is in the highest gear;
when the first and second ends of the speed regulating switch S-WK1 are in an off state, the speed regulating switch S-WK1 performs a gear adjustment by changing the resistance value of the resistance adjusting module 110.
Specifically, when the first end and the second end of the speed regulation switch S-WK1 are turned on, the speed regulation switch S-WK1 is equivalent to short-circuiting the resistance adjustment module 110 and the thyristor 130, and at this time, the power supply voltage of the power supply circuit is fully applied to the motor, so that the driving capability of the motor is strongest, and the speed regulation circuit 10 is correspondingly located at the highest gear.
When the first end and the second end of the speed regulation switch S-WK1 are disconnected, the resistance regulation module 110 correspondingly has a resistance value every time the speed regulation switch S-WK1 selects a gear, so that different gears correspond to different RC charge-discharge time constants, the on-off time of the controllable silicon 130 is changed, the voltage applied to the motor is correspondingly regulated under the control of the controllable silicon 130, and the gear regulation of the speed regulation switch S-WK1 is realized according to the resistance value of the resistance regulation module 110.
According to the speed regulation circuit 10 provided by the embodiment, the magnetic bead L1 is arranged at the control end of the controllable silicon 130, when the speed regulation circuit 10 is in a high-frequency common-mode interference state, the impedance of the magnetic bead L1 is large, so that delay charging of the capacitor C1 is formed, the dead time of the controllable silicon 130 is increased, and the problem of electromagnetic interference caused when the speed regulation circuit 10 is started in a negative half cycle is solved; meanwhile, when the magnetic bead L1 is In a high-frequency common-mode interference state, because the impedance of the magnetic bead L1 is large and is equal to an open circuit, an extra current path cannot be formed between the input end In of the speed regulating circuit, the controlled silicon 130 and the output end Out of the speed regulating circuit, and therefore abnormal change of the on-off time of the controlled silicon 130 is avoided. The magnetic bead L1 and the first bidirectional trigger diode VD1 provided in this embodiment are connected in series, the magnetic bead L1 can suppress high-frequency interference, and the first bidirectional trigger diode VD1 can suppress low-frequency interference, so that the full-band anti-interference capability of the speed adjusting circuit 10 is improved. The speed regulating circuit 10 provided by the embodiment can be applied to an electric tool for regulating speed by the thyristor 130. Meanwhile, the embodiment improves the anti-electromagnetic interference capability of the speed regulating circuit 10 by arranging the magnetic bead L1, and has the advantages of low cost and easy implementation.
Optionally, fig. 3 is a schematic structural diagram of an electric tool according to an embodiment of the present invention, and the electric tool is not limited to products such as a sander using a thyristor speed regulator switch. Referring to fig. 3, the power tool includes a power supply circuit, a motor and a speed regulating circuit 10 provided by any embodiment of the present invention; the power supply circuit has a first output terminal Vout1 and a second output terminal Vout 2;
one end of the motor is connected with the output end Out of the speed regulating circuit, and the other end of the motor is connected with the first output end Vout1 of the power supply circuit;
the input terminal In of the speed regulating circuit is connected with the second output terminal Vout2 of the power supply circuit.
Specifically, the motor includes a stator winding and a rotor. In some embodiments, the motor is a three-phase brushless motor including a rotor having permanent magnets and electronically commutated three-phase stator windings U, V, W. In some embodiments, a star type connection is used between three-phase stator windings U, V, W, and in other embodiments, an angular type connection is used between three-phase stator windings U, V, W. However, it must be understood that other types of brushless motors are also within the scope of the present disclosure. The brushless motor may include less or more than three phases. The motor is used for driving the connected functional parts to realize corresponding functions. For example, when the power tool is a sander, the motor is used to convert electrical energy into power that can be transmitted to the sole plate. The bottom plate is positioned outside the shell of the electric tool and can be used for installing or clamping accessories such as sand paper and the like.
One end of the motor is connected with the output end Out of the speed regulating circuit, and the other end of the motor is connected with the first output end Vout1 of the power supply circuit, so that the voltage applied to the motor is regulated by changing gears through the speed regulating circuit 10, and the rotating speed of the motor is regulated.
Optionally, the power tool further comprises a bus capacitor C and a power control switch S1;
the bus capacitor C is connected between the first output end Vout1 and the second output end Vout2 of the power supply circuit in parallel;
the first end of the power control switch S1 is connected to the second output terminal Vout2 of the power supply circuit, and the second end of the power control switch S1 is connected to the input terminal In of the speed regulation circuit.
Specifically, the capacitance value of the bus capacitor C is used for energy storage and filtering to output a stable voltage to the motor.
The power control switch S1 may be used to turn the power supply circuit of the power tool on and off.
The electric tool that this embodiment provided includes the speed governing circuit that any embodiment provided above, consequently the utility model discloses the electric tool that the embodiment provided possesses the beneficial effect that any embodiment possessed above-mentioned.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A speed regulation circuit for regulating the speed of a motor, comprising: the resistor adjusting module, the filter circuit and the silicon controlled rectifier; the controllable silicon is connected in series with a power supply loop of the motor;
the first end of the resistance adjusting module is connected with the output end of the speed regulating circuit, and the second end of the resistance adjusting module is connected with the input end of the speed regulating circuit through a capacitor;
the first end of the filter circuit is connected with the second end of the resistance adjusting module, and the second end of the filter circuit is connected with the control end of the controllable silicon;
the first end of the controllable silicon is connected with the output end of the speed regulating circuit, and the second end of the controllable silicon is connected with the input end of the speed regulating circuit.
2. The throttle circuit of claim 1, wherein the filter circuit includes a first filter element and a second filter element arranged in series, wherein,
the first end of the first filter element is used as the first end of the filter circuit, the second end of the first filter element is connected with the first end of the second filter element, and the second end of the second filter element is used as the second end of the filter circuit.
3. The throttle circuit of claim 2, wherein the first filter element is a magnetic bead.
4. The speed regulation circuit of claim 2 wherein the second filtering element is a first diac.
5. The throttle circuit of claim 1, wherein the resistance adjustment module comprises a first variable resistance, a second variable resistance, and a first resistance; the first variable resistor and the second variable resistor are arranged in parallel;
a first end of the first resistor is used as a first end of the resistance adjusting module, and a second end of the first resistor is respectively connected with a first end of the first variable resistor and a first end of the second variable resistor;
a second end of the first variable resistor and a second end of the second variable resistor are connected and then serve as a second end of the resistance adjusting module;
and the sliding end of the first variable resistor and the sliding end of the second variable resistor are connected and then used as the resistance value adjusting end of the resistance adjusting module.
6. The throttle circuit of claim 5, further comprising a second diac and a third diac;
the first end of the second bidirectional trigger diode is connected with the first end of the third bidirectional trigger diode;
a second end of the second bidirectional trigger diode is connected with a second end of the first resistor;
and the second end of the third bidirectional trigger diode is connected with the input end of the speed regulating circuit.
7. The speed regulation circuit of claim 1 further comprising a speed regulation switch;
the first end and the second end of the speed regulating switch are correspondingly connected with the input end and the output end of the speed regulating circuit; and the control end of the speed regulation switch is connected with the resistance value regulation end of the resistance regulation module.
8. The throttle circuit of claim 7,
when the first end and the second end of the speed regulating switch are in a conducting state, the speed regulating circuit is in the highest gear;
when the first end and the second end of the speed regulating switch are in a disconnected state, the speed regulating switch adjusts the gear by changing the resistance value of the resistance adjusting module.
9. A power tool comprising a power supply circuit, a motor and a speed regulation circuit as claimed in any one of claims 1 to 8; the power supply circuit has a first output terminal and a second output terminal;
one end of the motor is connected with the output end of the speed regulating circuit, and the other end of the motor is connected with the first output end of the power supply circuit;
and the input end of the speed regulating circuit is connected with the second output end of the power supply circuit.
10. The power tool of claim 9, further comprising a bus capacitor and a power control switch;
the bus capacitor is connected in parallel between a first output end and a second output end of the power supply circuit;
and the first end of the power supply control switch is connected with the second output end of the power supply circuit, and the second end of the power supply control switch is connected with the input end of the speed regulating circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021054577.8U CN212258820U (en) | 2020-06-10 | 2020-06-10 | Speed regulation circuit and electric tool |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021054577.8U CN212258820U (en) | 2020-06-10 | 2020-06-10 | Speed regulation circuit and electric tool |
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| CN212258820U true CN212258820U (en) | 2020-12-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113091420A (en) * | 2021-04-17 | 2021-07-09 | 江苏创洁环保科技有限公司 | Rotary drum dryer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113091420A (en) * | 2021-04-17 | 2021-07-09 | 江苏创洁环保科技有限公司 | Rotary drum dryer |
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Address after: No. 529, Jiangjun Avenue, Jiangning Economic and Technological Development Zone, Nanjing, Jiangsu Province Patentee after: Nanjing Quanfeng Technology Co.,Ltd. Address before: No. 529, Jiangjun Avenue, Jiangning Economic and Technological Development Zone, Nanjing, Jiangsu Province Patentee before: NANJING CHERVON INDUSTRY Co.,Ltd. |
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