CN112289642B - Low-voltage direct-current contactor and production process thereof - Google Patents

Abstract

The application relates to the field of contactors, in particular to a low-voltage direct-current contactor and a production process thereof, wherein the low-voltage direct-current contactor comprises an outer shell and a control assembly, and the low-voltage direct-current contactor comprises an upper housing, a base and a lower housing; the control assembly is connected with an external control cabinet through a connecting end; the connecting end is arranged at the side wall of the lower housing; the control assembly comprises a power piece, the power piece comprises a coil, a coil support for installing the coil and a suction piece, a group of coil contact pins connected with the coil are arranged on two end faces of the coil support, the number of each group of coil contact pins is consistent with that of wires of the coil and corresponds to that of the wires of the coil one by one, and one group of coil contact pins are connected with a coil male end. The application also provides a production process of the low-voltage direct current contactor, which is used for producing and preparing the coil bracket, and the coil bracket has the effects of realizing automation in the winding, tin dipping and testing links and improving the production efficiency of the whole process.

Description

Low-voltage direct-current contactor and production process thereof

Technical Field

The application relates to the field of contactors, in particular to a low-voltage direct current contactor and a production process thereof.

Background

The contactor is divided into an alternating current contactor and a direct current contactor, and is applied to electric power, distribution and power utilization fields. Contactors are broadly electric appliances in which a magnetic field is generated by a current flowing through a coil in industrial electricity, so that a contact is closed to control a load.

The common contactor comprises an outer shell, wherein the outer shell comprises a base and a cover body, a main contact for being connected with a main loop and a control contact for being connected with a control loop are fixedly connected on the base, the main contact is connected with the main loop, the control contact is connected with the control loop, a coil is placed in the outer shell, the control circuit is communicated with the coil, and the on-off of the main loop is controlled by magnetic force generated or lost by the on-off of the coil under the on-off control of the control circuit.

Common wiring terminals of the coil are flexible wire connection, and when the coil is connected with an external circuit, the end part of the coil needs to be manually subjected to head welding, so that the efficiency is low, and the operation is complex.

Chinese patent publication No. CN107978489B discloses a double-coil contactor and a circuit control system, which comprises an electromagnetic mechanism and a contact mechanism, wherein the electromagnetic mechanism comprises: the coil support, the start coil and the holding coil of suit in order from inside to outside to and two coil wiring ends, contact mechanism includes: auxiliary movable contact and auxiliary static contact. The auxiliary movable contact piece, the auxiliary static contact piece and the two coil wiring terminals are arranged on the end face of the coil bracket.

The contactor disclosed in the above document avoids the connection process by wire welding, improves the production efficiency, is connected to the outside through the auxiliary static contact, and needs to connect the connection point of the control loop to the wiring terminal of the coil in a mode of wire wrapping or clamping piece and the like when the control loop is connected, so that the contactor consumes longer time when the production and the preparation are finished for testing, and reduces the production efficiency.

Disclosure of Invention

The application provides a low-voltage direct current contactor and a production process thereof, aiming at solving the problems that the time consumption is long and the production efficiency is reduced when the production and the preparation of the contactor are finished for testing.

In a first aspect, the present application provides a low-voltage dc contactor, which adopts the following technical scheme:

a low voltage DC contactor comprises,

the shell body is used for protecting internal components and parts and comprises an upper shell, a base and a lower shell which are connected in sequence, wherein one side of the base, which faces the upper shell, is provided with a main contact for connecting with a main loop;

the control assembly is arranged in the cavity formed by the lower housing and is connected with an external control cabinet through a connecting end and is used for receiving a control signal to control the opening and closing of the main loop; the connecting end is arranged at the side wall of the lower housing;

the control assembly comprises a power piece, the power piece comprises a coil, a coil support for installing the coil and a suction piece, a group of coil pins connected with the coil are arranged on two end faces of the coil support, the number of the coil pins is consistent with that of wires of the coil, the coil pins are in one-to-one correspondence, a group of coil pins are connected with a coil male end, and a terminal shell is arranged outside the coil male end and forms a connecting end with the terminal shell.

By adopting the technical scheme, the hole sites of the coil pins are added at the edge of the coil frame, and after the coil is assembled with the pins, automatic winding, automatic tin dipping and automatic testing can be realized, so that the conditions that the coil is short-circuited and burnt out due to the fact that a flexible wire is used as a head, welded and wrapped, and the paint layer of the coil enamelled wire is easy to damage when a tin tip is easily generated during wrapping when the head is welded are reduced.

Meanwhile, the coil contact pin is connected with the coil male end, the coil male end and the terminal shell form a connecting end, namely the connecting end is in the form of a wiring terminal, and in the use process, only the terminal matched with the coil contact pin is needed to be inserted. The wiring mode in the related art is to screw up with nut and terminal to connect, result in test and efficiency low while using and installing practically, the application adopts the mode that the terminal is pegged graft, reduce the time in the wiring process by a wide margin, also facilitate carrying on the automatic test at the same time, the automatic difficulty of the existing wiring mode is greater, the automatic difficulty of the wiring mode of the application is lower than the difficulty of the automation of the wiring mode. In conclusion, the coil is matched with the connecting end, automation can be realized in the winding, tin dipping and testing links, and the production efficiency of the whole process is improved.

The main contact and the connecting end of the control component are respectively positioned at two sides of the base, and the main contact and the connecting end are separated by the base, so that the creepage distance between the main loop and the control loop is increased, the risk that the main loop breaks down the control loop is reduced, meanwhile, the size of the base can be reduced due to the fact that only the main contact is arranged on the base, and the size of the whole low-voltage direct-current contactor is smaller, and the application range of the low-voltage direct-current contactor is wider.

Preferably, the coil support is arranged between a group of coil pins and protrudes with a wire block, and the wire block is provided with a wire groove.

Through adopting above-mentioned technical scheme, wire piece and metallic channel play the guide effect to the wire when carrying out the wire winding operation for the wire is difficult for changing when twining, guarantees the stability of wire winding.

Preferably, the main contact comprises a driving contact and a main static contact, the main static contact is two static spring plates respectively connected with the main loop, a gap is reserved between the two static spring plates, and the driving contact can be abutted against the two static spring plates;

the control assembly further comprises a transmission mechanism, the power piece comprises a coil and a suction piece, the transmission mechanism comprises a transmission rod, and two end parts of the transmission rod are fixedly connected with the suction piece and the driving contact respectively.

By adopting the technical scheme, the structure mode of the main contact and the control component is provided specifically but not limitedly, under the condition that the structure mode is not used as the only explanation, after the control circuit electrifies the coil, the coil generates magnetism so as to absorb the attraction piece, the attraction piece drives the driving contact to move to the driving contact to be contacted with the two static reed mutually through the transmission rod, and the main circuit is communicated through the mutual contact of the driving contact and the two static reed, so that the control of the main circuit is realized.

Preferably, a pad bowl is arranged at the end part of the transmission rod, provided with the active contact, an auxiliary pressure spring is arranged between the pad bowl and the active contact, the auxiliary pressure spring and the pad bowl are sequentially arranged along the direction away from the main static contact.

Through adopting above-mentioned technical scheme, through addding pad bowl and pressure spring, pad bowl is used for fixed and fixed auxiliary spring, and the pressure spring is used for making the contact between movable contact and the static reed inseparable, is difficult for breaking away from.

Preferably, the side wall of the base is provided with a mounting plate, and the mounting plate and the base are integrally formed.

By adopting the technical scheme, the metal bracket is required to be installed on the base when the contactor is installed in the related art, and the installation plate is not required to be arranged, so that the material of the installation plate can be selected to be a plastic material, the overall weight of the contactor is further reduced, and meanwhile, the volume of the contactor is reduced, so that the application range of the low-voltage direct-current contactor is wider.

Preferably, the device further comprises an auxiliary contact, wherein the auxiliary contact is installed inside the lower housing.

By adopting the technical scheme, the auxiliary contact is used for control, for example, the auxiliary contact is used for realizing when a self-locking and interlocking circuit is needed.

Preferably, the auxiliary contact is a printed circuit board and a control module mounted on the printed circuit board, the control module comprises a start winding and a hold winding, the control module is used for receiving a signal of a control circuit and controlling switching on and off of the start winding and the hold winding, when the control module receives the signal of the control circuit, the start winding is electrified, the hold winding is powered off, and when the main contact is closed, the start winding and the hold winding are connected in series and electrified.

By adopting the technical scheme, the mechanical auxiliary contact is replaced by the printed circuit board, so that the problem of oxidation of the surface of the contact is avoided, the auxiliary contact is not easy to fail, when the control module receives a signal of the control circuit, the starting winding is electrified, the winding is kept to be powered off, so that the main contact is closed, at the moment, the communication state of the main loop can be kept only by small current in the control module, and then the starting winding and the holding winding are connected in series and electrified, so that the current in the control module is reduced.

Preferably, the control module further comprises,

the anode of the first diode is coupled with the signal input end of the control circuit, the cathode of the first diode is coupled with the holding winding, the holding winding is connected in series with the starting winding, and the other end of the starting winding is coupled with the signal output end of the control circuit;

the delay circuit area is used for receiving the voltage signal output of the control circuit and gradually increasing the voltage signal, and one end of the delay circuit area is coupled with the connection point of the control circuit and the first diode;

and the grid electrode of the switching tube is coupled with the time delay circuit area, the drain electrode of the switching tube is coupled with the connection point of the first diode and the holding winding, and the source electrode of the switching tube is coupled with the connection point of the holding winding and the starting winding.

By adopting the technical scheme, after the control circuit is electrified, the voltage of the delay circuit area is gradually increased, when the voltage of the delay circuit area is increased to the rated voltage of the grid electrode of the switching tube, the switching tube is conducted to enable the starting winding to be electrified, the holding winding is powered off, so that the main contact is closed, then the output voltage of the control circuit is reduced, the switching tube is in an end-on state, the starting winding and the holding winding are connected in series and electrified, and the main contact is in a holding state.

Preferably, the delay circuit region comprises,

the anode of the second diode is coupled with the connection point of the control circuit and the first electrode tube;

a first resistor, one end of which is coupled with the cathode of the first diode, and the other end of which is coupled with the grid electrode of the switch tube;

one end of the first capacitor is coupled with the connection point of the first resistor and the switching tube, and the other end of the first capacitor is coupled with the drain electrode of the switching tube;

and one end of the second resistor is coupled with the connection point of the first resistor and the switching tube, and the other end of the second resistor is coupled with the drain electrode of the switching tube.

Through adopting above-mentioned technical scheme, after control circuit circular telegram, the power charges to first electric capacity to make the voltage at first electric capacity both ends rise gradually, thereby make the grid voltage of switch tube can not break suddenly, thereby protection switch tube is not fragile.

In a second aspect, the application provides a production process of a low-voltage direct current contactor, which adopts the following technical scheme:

a production process of a low-voltage direct current contactor is used for producing the low-voltage direct current contactor, comprising the following steps of,

s1, placing the coil support in a vibration disc for feeding;

s2, conveying the coil bracket to a next process;

s3, feeding the coil support to a winding machine for winding twice;

s4, feeding the coil support to a loading jig, and transporting to a welding machine for soldering;

s5, feeding the coil support to a turnover jig of a testing machine, and transporting the coil support to the testing machine for winding test;

s6, distinguishing the qualified products from the unqualified products after the test;

and S7, automatically arranging the finished coil support for standby by using a robot.

By adopting the technical scheme, the production, the preparation and the test of the coil bracket are realized, the automation is realized, and the production efficiency of the whole process is improved.

In summary, the present application includes at least one of the following beneficial technical effects:

according to the application, the coil plug is matched with the connecting end, automation can be realized in the winding, tin dipping and testing links, and the production efficiency of the whole process is improved;

the contactor increases the creepage distance between the main loop and the control loop, and reduces the risk of breakdown of the control loop by the main loop;

the contactor is provided with the mounting plate, so that a metal bracket is not required to be arranged;

according to the application, the mechanical auxiliary contact is replaced by the printed circuit board, so that the problem of oxidation of the contact surface is avoided, and the auxiliary contact is not easy to fail.

Drawings

Fig. 1 is a schematic diagram of the overall structure of a low-voltage dc contactor according to an embodiment of the present application.

Fig. 2 is a schematic diagram of the overall structure of a low voltage dc contactor according to another embodiment of the application.

Fig. 3 is a schematic diagram illustrating an internal structure of a low voltage dc contactor according to an embodiment of the present application.

Fig. 4 is a front view of a coil support of an embodiment of a low voltage dc contactor of the present application.

Fig. 5 is a cross-sectional view of A-A in fig. 4.

Fig. 6 is a schematic circuit diagram of an auxiliary contact of an embodiment of a low voltage dc contactor according to the present application.

Reference numerals illustrate:

1. an outer housing; 11. an upper housing; 12. a base; 121. a mounting plate; 122. a mounting hole; 13. a lower housing;

2. a control assembly; 21. a connection end; 211. a terminal housing; 212. a coil male end; 22. a power member; 221. a coil; 222. an armature; 223. a suction member; 23. a transmission mechanism; 231. a transmission rod; 232. a bowl is filled up; 233. an auxiliary pressure spring; 234. an insulating sleeve; 235. a contact bridge; 236. a coil support; 2361. a coil pin; 2352. a wire block; 2363. a wire groove; 237. a coil sheath; 24. a main compression spring;

3. a main contact; 31. an active contact; 32. a main stationary contact; 321. a static reed; 322. a connecting bolt; 3221. a spring pad; 3222. a nut;

4. an auxiliary contact; 41. a printed circuit board; 42. a control module; 421. starting a winding; 422. holding the windings; 423. a delay circuit region; d1, a first diode; MOS, switch tube; d2, a second diode; d3, a zener diode; r1, a first resistor; r2, a second resistor; c1, a first capacitor.

Detailed Description

The application is described in further detail below with reference to fig. 1-6.

The embodiment of the application discloses a low-voltage direct current contactor. Referring to fig. 1, a low voltage dc contactor includes an outer housing 1 and a control assembly 2.

Referring to fig. 1 and 2, the outer housing 1 is used for protecting internal components, and comprises an upper housing 11, a base 12 and a lower housing 13 which are sequentially connected, wherein a main contact 3 for connecting with a main circuit is arranged on one side of the base 12 facing the upper housing 11. The outer housing 1 may be selected from plastics or other non-conductive materials. The upper housing 11 is used for dustproof and arc-isolating, the base 12 is used for supporting and installing the main contact 3, the upper housing 13 and the lower housing 13 are connected, the lower housing 13 is used for dustproof and insulation, and a holding space is provided for a user.

Referring to fig. 1 and 2, the control assembly 2 is installed in a cavity formed by the lower housing 13, and is connected to an external control cabinet through a connection end 21, for receiving a control signal to control the opening and closing of the main circuit; the connection end 21 is provided at a side wall of the lower housing 13. The main contact 3 and the connecting end 21 are respectively positioned at two sides of the base 12, so that the creepage distance between the main loop and the control loop is increased, and the risk that the main loop breaks down the control loop is reduced.

The upper housing 11 is detachably connected with the base 12, optionally in a snap-fit manner, or in a threaded manner, and the base 12 is detachably connected with the lower housing 13, optionally in a snap-fit manner, or in a threaded manner. In the application, the upper housing 11 or the lower housing 13 is connected with the base 12 in a buckling manner, hidden danger caused by fastening by screws in the related art is eliminated, the upper housing 11 or the lower housing 13 is connected and fixed by the screws, insufficient or excessive tightening force can occur in the preparation process, when the tightening force is insufficient, the dust-proof level of loose products is reduced, gaps lead to contact arc overflow, and a control loop and a main loop are short-circuited, so that the products fail. The excessive tightening force causes damage to the upper housing 11 or the lower housing 13 during the process, thus allowing the snap-fit connection, reducing the occurrence of such a situation,

referring to fig. 2, specifically, the connection end 21 is a plug-in terminal, the connection end 21 includes a terminal housing 211 and a coil male end 212, and the terminal housing 211 is fixedly connected to a side wall of the lower housing 13; the coil male end 212 is located inside the terminal housing 211, and one end of the coil male end 212 is connected to the control assembly 2, and the other end is connected to the control loop. The plug-in terminal is a common connection mode, and the plug-in terminal is used, so that the connection end 21 is convenient to connect with a control loop, and the plug-in is convenient and saves time.

Referring to fig. 2, a mounting plate 121 is provided on a side wall of the base 12, the mounting plate 121 is made of the same material as the base 12, and is integrally formed with the base 12, and two mounting holes 122 are formed in the mounting plate 121 for mounting and fixing the contactor. In the application, by arranging the mounting plate 121 without arranging the metal bracket, the material of the mounting plate 121 can be selected to be plastic, thereby reducing the overall weight of the contactor, and simultaneously reducing the volume of the contactor, so that the application range of the low-voltage direct-current contactor is wider.

Referring to fig. 1 and 3, the main contact 3 includes a main contact 31 and a main stationary contact 32, the main stationary contact 32 is two stationary springs 321 connected to the main circuit, a gap is reserved between the two stationary springs 321, and the main contact 31 can collide with the two stationary springs 321. The control assembly 2 comprises a power piece 22 and a transmission mechanism 23, wherein the power piece 22 comprises a coil 221 and an attracting piece 223, the attracting piece 223 is made of ferromagnetic materials, a cylindrical iron block is selected, the transmission mechanism 23 comprises a transmission rod 231, and two end parts of the transmission rod 231 are fixedly connected with the attracting piece 223 and the driving contact 31 respectively. The structure of the main contact 3 and the control assembly 2 is given herein, without being the only explanation, after the control circuit energizes the coil 221, the coil 221 generates magnetism, so as to attract the attraction member 223, the attraction member 223 drives the active contact 31 through the transmission rod 231 to move until the active contact 31 contacts with the two static springs 321, and the active contact 31 contacts with the two static springs 321, so that the main circuit is communicated, thereby realizing control of the main circuit.

Referring to fig. 3, in this embodiment, the coils 221 are fixed by a coil 221 bracket, the coils 221 are fixed in the lower housing 13, the coils 221 can be fixed by glue, the coils can be engaged by a buckle, or the coils can be fixed by bolts, the coils 221 are wound on the coil 221 bracket, and a coil sheath 237 is sleeved outside the coils 221 to protect the coils 221. The coil sheath 237 improves insulation and compressive strength between the coil 221 and the yoke 222, and is wrapped by a PET adhesive tape in the related art, and the insulation and compressive performance of the product are affected due to aging of the PET adhesive tape along with time, temperature and environment, and the insulation mode may lead to hidden troubles of substandard insulation or compressive strength and the like. The coil sheath 237 solves the problems, and the front surface of the coil sheath 237 can be used for laser engraving product labels, so that the existing label labels are eliminated, and the durability of the labels is improved.

Referring to fig. 4 and 5, both end surfaces of the coil 221 support are provided with a set of coil pins 2361 connected to the coil 221, the number of each set of coil pins 2361 is identical to the number of wires of the coil 221 and corresponds to one by one, wherein one set of coil pins 2361 is connected to a coil male end 212, and a terminal housing 211 is provided outside the coil male end 212 and forms the aforementioned connection end 21 with the terminal housing 211. Ensuring the coil 221 and winding wire of the two windings to be used as heads, realizing the automatic processing process of the coil 221, improving the consistency and reliability of the coil 221, simultaneously improving the productivity of the coil 221, avoiding the state of semi-automatic winding, manual head winding, welding and bundling of the existing product, avoiding the hidden trouble that tin tips are easy to be generated when the existing coil 221 is used as heads for welding, causing the damage of enamel paint layers and short circuit burnout of enamelled wires when bundling; the pins at the other end of the coil 221 are used as pins of a product control loop at the same time, so that the through rate and the reliability of the connection of the control loop are ensured.

Further, a wire block 2362 protrudes from the coil 221 support between a set of coil pins 2361, and a wire groove 2363 is formed in the wire block 2362. The wire block 2362 and the wire groove 2363 play a guiding role on the wire when the wire is wound, so that the wire is not easy to change when the wire is wound, and the stability of winding is ensured.

Referring to fig. 3, further, the end portion of the driving rod 231 provided with the driving contact 31 is fixedly connected with a pad bowl 232, the pad bowl 232 is in a shape of a round cake, an auxiliary pressure spring 233 is arranged between the pad bowl 232 and the driving contact 31, the auxiliary pressure spring 233 and the pad bowl 232 are sequentially arranged along the direction far away from the main static contact 32, an insulating sleeve 234 is arranged at the lower end of the auxiliary pressure spring 233, a contact bridge 235 is arranged at the lower end of the insulating sleeve 234, the contact bridge 235 is fixedly connected with the driving contact 31, the pad bowl 232 and the pressure spring are additionally arranged, the pad bowl 232 is used for fixing and fixing the auxiliary spring, and the pressure spring is used for enabling the contact between the driving contact 31 and the static reed 321 to be tight and not easy to break away.

With continued reference to fig. 3, further, an armature 222 is disposed inside the coil 221, the armature 222 is fixedly connected to the inner wall of the lower housing 13, and the armature 222 is cylindrical and forms an electromagnet with the coil 221, so that magnetism is increased, and when the coil 221 is energized, the attraction piece 223 is more easily attracted, so that sensitivity of the contactor is increased.

With continued reference to fig. 3, in this embodiment, a main compression spring 24 is disposed between the armature 222 and the engaging member 223, a placement groove for placing the main compression spring 24 is formed at one end of the armature 222 facing the engaging member 223 and one end of the engaging member 223 facing the armature 222, the main compression spring is located in the placement groove, two ends of the main compression spring 24 respectively collide with the armature 222 and the engaging member 223, when the armature 222 and the engaging member 223 are engaged with each other, the main compression spring 24 compresses to provide a restoring force for the engaging member 223, so that after the power is cut off, the engaging member 223 can be restored to the initial state to disconnect the main circuit.

Referring to fig. 3, each static reed 321 is fixedly connected with a connecting bolt 322, and a spring pad 3221 and a nut 3222 are sequentially arranged on the connecting bolt 322. The connecting bolt 322 is used for connecting with the main circuit, connects two contacts of the main circuit with the connecting bolt 322, and then locks by using the nut 3222, so that the connection is stable, and the spring pad 3221 makes the nut 3222 difficult to slide, and the locking is stable.

Referring to fig. 3 and 6, the low voltage dc contactor of the present application further includes an auxiliary contact 4, and the auxiliary contact 4 is installed inside the lower housing 13. The auxiliary contact 4 is used for control purposes, for example, when a self-locking and interlocking circuit is required, the auxiliary contact 4 is used.

The auxiliary contact 4 is a printed circuit board 41 and a control module 42 installed on the printed circuit board 41, the control module 42 comprises a start winding 421 and a holding winding 422, the control module 42 is used for receiving a signal of a control circuit and controlling the switching on and off of the start winding 421 and the holding winding 422, when the control module 42 receives the signal of the control circuit, the start winding 421 is powered on, the holding winding 422 is powered off, and after the main contact is closed, the start winding 421 and the holding winding 422 are connected in series and powered on.

Referring to fig. 6, specifically, the control module 42 includes a first diode D1, a delay circuit area 423, and a switching transistor MOS. The anode of the first diode D1 is coupled to the signal input terminal of the control circuit, the cathode of the first diode D1 is coupled to the holding winding 422, the holding winding 422 is connected in series with the start winding 421, and the other end of the start winding 421 is coupled to the signal output terminal of the control circuit. The delay circuit area 423 is used for receiving the voltage signal output of the control circuit and gradually increasing the voltage signal, and one end of the delay circuit area 423 is coupled to the connection point of the control circuit and the first diode D1. The gate of the switching transistor MOS is coupled to the delay circuit area 423, the drain of the switching transistor MOS is coupled to the connection point between the first diode D1 and the holding winding 422, and the source of the switching transistor MOS is coupled to the connection point between the holding winding 422 and the start winding 421.

When the voltage of the delay circuit area 423 is increased gradually after the control circuit is electrified, and when the voltage of the delay circuit area 423 is increased to the rated voltage of the grid electrode of the switching tube MOS, the switching tube MOS is conducted to enable the starting winding 421 to be electrified, the holding winding 422 is powered off, so that the main contact 3 is closed, then the output voltage of the control circuit is reduced, the switching tube MOS is in an end-on state, the starting winding 421 is connected in series with the holding winding 422 and electrified, and the control circuit enters a holding state.

Specifically, the delay circuit 423 includes a second diode D2, a first resistor R1, a first capacitor C1, a second resistor R2, and a zener diode D3. The anode of the second diode D2 is coupled to the connection point between the control circuit and the first electrode tube. One end of the first resistor R1 is coupled with the cathode of the first diode D1, and the other end of the first resistor R1 is coupled with the grid electrode of the switching tube MOS. One end of the first capacitor C1 is coupled to the connection point of the first resistor R1 and the switching tube, and the other end of the first capacitor C1 is coupled to the drain of the switching tube MOS. One end of the second resistor R2 is coupled to the connection point of the first resistor R1 and the switching tube, and the other end of the second resistor R2 is coupled to the drain of the switching tube MOS. One end of the zener diode D3 is coupled with the grid electrode of the switching tube MOS, and the other end of the zener diode D3 is coupled with the source stage of the switching tube MOS.

After the control circuit is electrified, the power supply charges the first capacitor C1, so that the voltage at two ends of the first capacitor C1 is gradually increased, the grid voltage of the switching tube MOS is not suddenly changed, and the switching tube MOS is protected from being damaged. The voltage stabilizing diode D3 is connected between the grid electrode and the source electrode of the switching tube MOS, so that the grid voltage is stabilized within a specified working voltage range, and breakdown damage caused by overlarge voltage between the grid electrode and the source electrode of the switching tube MOS is reduced.

The implementation principle of the low-voltage direct current contactor provided by the embodiment of the application is as follows: according to the application, the hole sites of the coil pins 2361 are added on the edge of the coil 221 frame, after the coil 221 is assembled with the coil pins 2361, automatic winding, automatic tin dipping and automatic testing can be realized, and the conditions that the coil 221 is burnt out due to short circuit caused by heating when the coil 221 is powered up due to the fact that a flexible wire is used as a head, welded and wrapped, and a tin tip is easy to cause damage to a paint layer of a coil 221 enameled wire when the head is welded are reduced.

Meanwhile, the coil pin 2361 is connected with the coil male end 212, the coil male end 212 and the terminal housing 211 form a connecting end 21, namely the connecting end 21 is in the form of a wiring terminal, and only the terminal matched with the connecting end 21 is needed to be used for plugging in the using process. The connection mode in the related art is to screw up with nut 3222 and terminal to connect, result in efficiency is low when testing and actual use are installed, the application adopts the mode that the terminal is pegged graft, reduce the time in the wiring process by a wide margin, also be convenient for carry out automated test simultaneously, the automation degree of difficulty of the existing connection mode is great, the automation degree of difficulty of the connection mode of the application is lower than. In summary, the coil pins 2361 cooperate with the connection end 21 to realize automation in the winding, tin dipping and testing links, thereby improving the production efficiency of the whole process.

In the application, the main contact 3 and the connecting end 21 of the control component 2 are respectively positioned at two sides of the base 12, and the main contact 3 and the connecting end 21 are separated by the base 12, so that the creepage distance between the main loop and the control loop is increased, the risk of breakdown of the control loop by the main loop is reduced, and meanwhile, the size of the base 12 can be reduced only by installing the main contact 3 on the base 12, so that the size of the whole low-voltage direct-current contactor is smaller, and the application range of the low-voltage direct-current contactor is wider.

The embodiment of the application also discloses a production process of the low-voltage direct-current contactor, which is used for producing the low-voltage direct-current contactor and comprises the following steps of,

s1, placing a coil 221 support in a vibration disc for feeding, wherein the vibration disc enables the coil 221 support to feed according to a specified direction;

s2, transporting the coil 221 support to the next process, and transporting the coil support through a conveyor belt;

s3, feeding the coil 221 support to a winding machine for winding twice;

s4, feeding the coil 221 support to a loading jig, transporting to a welding machine, and soldering, wherein coil pins 2361 on two sides of the coil 221 support are soldered;

s5, feeding the coil 221 support to a turnover jig of a testing machine, and conveying the turnover jig to the testing machine for winding test;

s6, distinguishing qualified products from unqualified products after testing, and automatically grabbing by using a robot;

and S7, automatically swaying the completed coil 221 support by using a robot arm for standby.

The implementation principle of the production process of the low-voltage direct-current contactor provided by the embodiment of the application is as follows: and the production, preparation and test of the coil 221 support are realized, the automation is realized, and the production efficiency of the whole process is improved.

The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims (4)

1. A low voltage dc contactor, characterized by: comprising the steps of (a) a step of,

the shell body (1) is used for protecting internal components and parts and comprises an upper cover shell (11), a base (12) and a lower cover shell (13) which are connected in sequence, wherein one side of the base (12) facing the upper cover shell (11) is provided with a main contact (3) used for being connected with a main loop;

the control assembly (2) is arranged in a cavity formed by the lower housing (13), is connected with an external control cabinet through a connecting end (21) and is used for receiving a control signal to control the opening and closing of the main loop; the connecting end (21) is arranged at the side wall of the lower housing (13);

the control assembly (2) comprises a power piece (22), the power piece (22) comprises a coil (221), a coil bracket (236) for installing the coil (221) and a suction piece (223), a group of coil pins (2361) connected with the coil (221) are arranged on two end faces of the coil bracket (236), the number of each group of coil pins (2361) is consistent with and corresponds to that of wires of the coil (221), one group of coil pins (2361) is connected with a coil male end (212), and a terminal shell (211) is arranged outside the coil male end (212) and forms the connecting end (21) with the terminal shell (211);

the main contact (3) comprises a main contact (31) and a main static contact (32), the main static contact (32) is two static springs (321) which are respectively connected with a main loop, a gap is reserved between the two static springs (321), and the main contact (31) can be abutted against the two static springs (321);

the control assembly (2) further comprises a transmission mechanism (23), the transmission mechanism (23) comprises a transmission rod (231), and two end parts of the transmission rod (231) are fixedly connected with the suction piece (223) and the driving contact (31) respectively;

the end part of the transmission rod (231) provided with the driving contact (31) is provided with a pad bowl (232), an auxiliary pressure spring (233) is arranged between the pad bowl (232) and the driving contact (31), the auxiliary pressure spring (233) and the pad bowl (232) are sequentially arranged along the direction away from the main static contact (32);

the side wall of the base (12) is provided with a mounting plate (121), and the mounting plate (121) and the base (12) are integrally formed;

the device further comprises an auxiliary contact (4), wherein the auxiliary contact (4) is arranged inside the lower housing (13);

the auxiliary contact (4) is a printed circuit board (41) and a control module (42) arranged on the printed circuit board (41), the control module (42) comprises a starting winding (422) and a holding winding (421), the control module (42) is used for receiving a signal of a control circuit and controlling the switching on and off of the starting winding (422) and the holding winding (421), when the control module (42) receives the signal of the control circuit, the starting winding (422) is electrified, the holding winding (421) is powered off, and after the main contact (3) is closed, the starting winding (422) is connected in series with the holding winding (421) and electrified;

the coil support (236) is arranged between a group of coil pins (2361) and protrudes out of a wire block (2352), and a wire groove (2363) is formed in the wire block (2352).

2. A low voltage dc contactor according to claim 1, wherein: the control module (42) further includes,

a first diode (D1) with an anode coupled to a signal input terminal of the control circuit, a cathode coupled to one end of the holding winding (421), the other end of the holding winding (421) connected in series with one end of the start winding (422), and the other end of the start winding (422) coupled to a signal output terminal of the control circuit;

a delay circuit area (423) for receiving the voltage signal output of the control circuit and gradually increasing the voltage signal, wherein a first end of the delay circuit area is coupled with a connection point between the control circuit and the first diode (D1);

and the grid electrode of the switching tube (MOS) is coupled with the second end of the delay circuit area (423), the drain electrode of the switching tube is coupled with the connection point of the first diode (D1) and the holding winding (421), and the source electrode of the switching tube is coupled with the connection point of the holding winding (421) and the starting winding (422) and the third end of the delay circuit area (423).

3. A low voltage dc contactor according to claim 2, wherein: the delay circuit region (423) includes,

-a second diode (D2) having an anode coupled to a junction of the control circuit and the first diode (D1);

a first resistor (R1) having one end coupled to the cathode of the second diode (D2) and the other end coupled to the gate of the switching tube (MOS);

a first capacitor (C1) having one end coupled to a connection point of the first resistor (R1) and the switching tube and the other end coupled to a source of the switching tube (MOS);

and one end of the second resistor (R2) is coupled to the connection point of the first resistor (R1) and the switching tube, and the other end of the second resistor is coupled to the source electrode of the switching tube (MOS).

4. A process for producing a low voltage dc contactor according to any one of claims 1 to 3, characterized in that:

s1, placing the coil (221) support in a vibration disc for feeding;

s2, conveying the coil (221) bracket to the next working procedure;

s3, feeding the coil (221) support to a winding machine for winding twice;

s4, feeding the coil (221) support to a loading jig, and transporting the loading jig to a welding machine for soldering;

s5, feeding the coil (221) support to a turnover jig of a testing machine, and conveying the turnover jig to the testing machine for winding test;

s6, distinguishing the qualified products from the unqualified products after the test;

and S7, using a robot to automatically swing the completed coil (221) bracket for standby.