CN211589719U

CN211589719U - Grinder electromagnetic chuck control device

Info

Publication number: CN211589719U
Application number: CN201920615233.0U
Authority: CN
Inventors: 杨佐伦; 张红梅; 严韬; 陈炳东; 黄晓东
Original assignee: Chengdu Shuwon Technology Co ltd; Sichuan Province Joint Cnc Machine Co ltd
Current assignee: Chengdu Shuwon Technology Co ltd; Sichuan Province Joint Cnc Machine Co ltd
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2020-09-29
Anticipated expiration: 2029-04-30

Abstract

The utility model discloses a grinder electromagnetic chuck control device, which comprises a control unit, a rectifying unit, an adjusting unit and a protecting unit which are electrically connected in sequence; the control unit comprises a multi-gear switch SA1, a contactor KM1, a contactor KM2 and a time relay KT, wherein the contactor KM 3526, the contactor KM2 and the time relay KT are controlled by the position of the multi-gear switch SA 1; the contactor KM1 and the contactor KM2 are used for controlling magnetization and demagnetization of the sucker; the time relay KT is used for controlling demagnetization time; the adjusting unit comprises a multi-gear switch SA2 and a plurality of intermediate relays controlled by the gears of the multi-gear switch SA2, and each intermediate relay is connected with a resistor with different resistance values in series, so that the working current of the sucking disc can be adjusted at the position of SA 2; the protection unit is used for the magnetic loss protection of the sucker. The utility model has the advantages of, need not the demagnetization and just can adjust sucking disc suction, can avoid because of the component consume that frequent demagnetization leads to.

Description

Grinder electromagnetic chuck control device

Technical Field

The utility model relates to an electromagnet control field especially relates to a grinding machine electromagnet controlling means.

Background

In the process of processing metal parts by a surface grinding machine, an electromagnetic chuck is often required to be used for clamping and placing workpieces, and in the process, in order to prevent the workpieces from deforming, the electromagnetic chuck needs to frequently adjust electromagnetic suction forces with different sizes, so that the following problems can be caused: 1. residual magnetism can be left on the workpiece due to inaccurate adjustment of the electromagnetic attraction, so that the assembly implementation of subsequent stations is influenced; 2. when the work piece size is inequality, electromagnet's controlling means need frequently to fill demagnetization in order to change suction, because current electromagnet controlling means's operating current is great, consequently return circuit self-induced electromotive force is also great, frequently fill demagnetization can increase the probability that electronic component such as switch, contactor in the circuit was burnt by the surge, furtherly, if break down when electromagnet worked, can cause the accident that magnetic force disappears, the work piece drops, greatly increased electromagnet's danger coefficient.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a grinding machine electromagnet controlling means, in use need not frequently to fill demagnetization to can reduce the probability that electronic component was burnt out by the surge among the control circuit. The utility model discloses a concrete scheme as follows:

the utility model provides a grinding machine electromagnet controlling means, include: the device is sequentially provided with a control unit, a rectifying unit, a regulating unit and a protecting unit which are electrically connected; the control unit comprises a multi-gear switch SA1, a contactor KM1, a contactor KM2 and a time relay KT, wherein the contactor KM2 and the time relay KT are controlled to be attracted by the multi-gear switch SA 1; the contactor KM1 and the contactor KM2 are respectively used for controlling magnetization and demagnetization of the sucker; the time relay KT is connected with the contactor KM2 in series and used for controlling demagnetization time; the adjusting unit comprises a multi-gear switch SA2 and a plurality of intermediate relays which are controlled to be attracted by the multi-gear switch SA2, and each intermediate relay is connected with a resistor with different resistance values in series, so that the working current of the sucking disc can be adjusted when the SA2 gear changes; the protection unit comprises an undervoltage relay KUD and an undercurrent relay KAD, and is used for the magnetic loss protection of the sucker.

Further, contactor KM1 and contactor KM2 are used for controlling magnetization and demagnetization of the sucking disc respectively, specifically include:

the contactor KM1 and the contactor KM2 form an interlocking circuit, and control the direct-current working voltage of the sucker to be conducted when the contactor KM1 and the contactor KM2 are conducted;

the sucker is magnetized or demagnetized based on the polarity of the working voltage.

Further, the sucking disc realizes magnetizing or demagnetizing based on operating voltage polarity, specifically includes:

when the contactor KM1 is attracted, the sucker is magnetized based on positive voltage;

when the contactor KM2 is pulled in, demagnetization is realized by the sucker based on negative voltage.

Further, the rectifying unit includes: a transformer TC and a rectifier bridge UR.

Further, the alternating current power supply is AC-380V, the alternating current working voltage is AC-110V, and the direct current working voltage is DC-110V.

Further, the loss of excitation protection specifically includes:

the under-voltage relay KUD is connected between the positive electrode and the negative electrode of the power supply of the sucker, and controls the sucker and the workbench of the corresponding station of the sucker to stop working when the voltage value of the working power supply of the sucker abnormally decreases;

the undercurrent relay KAD is connected with the positive electrode or the negative electrode of the power supply of the sucker in series, and the sucker and the workbench of the corresponding station of the sucker are controlled to stop working when the working current of the sucker is abnormally reduced.

Further, the protection unit further includes:

and the RC series circuit is connected to the two ends of the positive electrode and the negative electrode of the sucker working power supply and is used for absorbing surge pulses in the direct current path when the KM1 or KM2 is disconnected.

Further, the on-off delay of the time relay KT is 3.5 seconds.

After the technical scheme is adopted, the utility model has the advantages that as follows:

1. this novel scheme sets up the operating current of resistance regulation electromagnet of multichannel single-pass according to the reposition of redundant personnel principle, makes electromagnet need not just can change electromagnet's suction size through the process of charging and discharging magnetism, has reduced electromagnet like this and has filled the quantity of discharging magnetism, has just also reduced the probability that circuit element is damaged because of the surge.

2. This novel scheme is through setting up undervoltage relay and undercurrent relay, can make sucking disc and sucking disc correspond the workstation stop work of station when electromagnetic chuck's operating voltage or operating current reduce unusually to guarantee that the work piece can not drop the departure, eliminated workman's personal safety hidden danger.

3. This novel scheme is through setting up the surge influence that RC series circuit eliminated and fill among the magnetism process to this RC series circuit can constitute RLC's oscillation attenuation circuit with the coil of sucking disc, more does benefit to the demagnetization of work piece.

4. This novel scheme simple structure, with low costs, only need many grades of switches of manual control can realize electromagnet's function, convenient to use.

Drawings

Fig. 1 is a schematic diagram of a module structure of the present invention;

FIG. 2 is a schematic circuit diagram of the present invention;

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

The present invention will be described in detail with reference to the accompanying drawings and examples.

As shown in fig. 1, the present invention provides a grinder electromagnetic chuck control device, which mainly comprises: the device is sequentially provided with a control unit, a rectifying unit, a regulating unit and a protecting unit which are electrically connected.

It can be understood that, in the present invention, the control unit is used for controlling the magnetization and demagnetization of the suction cup. Specifically, an interlocking circuit structure consisting of a multi-gear switch and a contactor is utilized to control magnetization and demagnetization of the sucker, when the switch is manually controlled, the contactor corresponding to the gear is attracted, an alternating current power supply input to a rectifying unit is conducted, and a power supply path output to the sucker is conducted; the different contactors are conducted with the sucker power supplies with different polarities, so that the suckers are magnetized or demagnetized.

Understandably, the novel rectifying unit is mainly used for converting an alternating current power supply into a direct current power supply of the sucker when the control unit controls the alternating current power supply to be conducted.

It can be understood that, in this novel, the regulating unit is used for adjusting the operating current of sucking disc to need not the demagnetization process and just can change the suction size of sucking disc. Specifically, the multi-gear switch is used for controlling the conduction of different resistance resistors connected with the output end of the rectifying unit in series, the working current of the sucker is adjusted based on the shunting principle, and then the suction force of the sucker is changed.

Understandably, in the novel structure, the protection unit is mainly used for eliminating the potential safety hazard of the electromagnetic chuck. Generally speaking, when the sucking disc is accomplished and is magnetized process start work, because electromagnetic chuck actuating circuit's operating voltage and operating current are all great, can appear insulating reduction, sucking disc coil and generate heat when long-time during operation adverse effect, can lead to operating voltage or the electric current of sucking disc to fall back gradually under the serious condition, when the sucking disc suction reduces to can't hold the work piece, the accident that the work piece was thrown away will appear. On the other hand, the magnetic field energy is stored in the sucker in the magnetizing process, and the polarity of the working voltage and the working current of the sucker is changed instantly in the demagnetizing process, so that surge pulse of self-induced electromotive force can be generated, and electronic elements are easily burnt. Here, the protection unit of the novel scheme can stop the work of the workbench of the corresponding station of the sucker and the sucker when the working voltage and the working current are reduced due to adverse electrical influence by arranging the undervoltage relay and the undercurrent relay in the direct current path of the sucker, so that personal injury accidents caused by flying workpieces due to continuous operation of the workbench are avoided; meanwhile, the RC series circuit is arranged between the positive electrode and the negative electrode of the direct-current power supply of the sucker, so that surge can be effectively absorbed, and electronic elements in the execution path of the sucker are protected from being burnt.

As shown in fig. 2, a schematic circuit diagram of an embodiment of the present novel solution is disclosed. The rectifier unit, which consists of a transformer TC and a rectifier bridge UR, is shown, the input of which is connected to the ac phase potential and supplies the suction cup YH with a dc operating voltage.

It can be understood that the input AC voltage is AC-380V in this embodiment, and the transformer TC reduces the input AC voltage to AC voltage AC-110V, and converts the AC voltage to DC voltage DC-110V through the rectifier bridge for output.

Three fuses FU1, FU2 and FU3 are connected in series at the alternating current phase potential end of the input end of the rectifying unit and are used for breaking a circuit when the phase path has overcurrent so as to protect the safety of the circuit behind; meanwhile, a fuse FU4 is also arranged at the direct current positive electrode of the input of the rectifying unit for overcurrent protection.

Can understand ground, the fuse type here can be plug-in fuse, spiral fuse, closed fuse etc. because this novel scheme in the sucking disc frequency of activation is more frequent, therefore the threshold current of fuse takes 3 ~ 3.5 times operating current, no longer gives details here.

It is to be understood that in this embodiment, the circuit configuration of the control unit is located between the ac phase and the N phase of FU 2. Specifically, the control unit mainly comprises a multi-gear switch SA1, a contactor KM1, a contactor KM2 and a time relay KT, wherein the contactors are controlled to be attracted by different gears of the multi-gear switch SA 1; the contactor KM1 and the contactor KM2 are respectively used for controlling the magnetization and demagnetization of the sucker.

Further, since the contactor KM1 and the contactor KM2 are respectively connected with different gears of the multi-gear switch SA1, an interlocking circuit structure is formed, that is, KM2 is open when KM1 is absorbed, and KM1 is open when KM2 is absorbed.

In this embodiment, the KM1 and the KM2 control the on state of the operating voltage of the suction cup YH, specifically, control the polarity change of the operating voltage of the suction cup YH, when the contactor KM1 is closed, the suction cup YH is magnetized based on the positive dc voltage, and when the contactor KM2 is closed, the suction cup YH is demagnetized based on the negative dc voltage. Therefore, based on the KM1 or KM2, the polarity of the power supply at the two ends of the sucker YH can be changed, and the magnetizing and demagnetizing functions of the sucker are realized.

It should be noted here that the control of the KM1 and KM2 on the suction cup YH may be performed through a related control circuit loop, not through direct control, for example, the control circuit further includes a control chip such as a single chip, when the KM1 or KM2 is pulled in, the control chip can generate a corresponding high-low level or PWM control signal, and then the dc power supply at the two ends of the suction cup YH is conducted through a loop such as an amplifying circuit and a switching circuit. The specific implementation of the control circuit should be a common approach for those skilled in the art, and is not described herein.

Therefore, in the technical scheme of the embodiment, the on-state of the sucker power supply is controlled based on the access structure of the multi-gear switch and the contactor, so that a better control effect can be realized.

Specifically, as the sucker is subjected to the magnetizing process before, even if the KM1 is disconnected, the sucker and the workpiece still have residual magnetism, and at the moment, the KM2 can be controlled to attract, so that the sucker is reversely magnetized, namely the demagnetizing process. The time relay KT connected with the KM2 in series is arranged to control demagnetization time, and the workpiece can be prevented from being attracted again due to the fact that the magnetic force of the sucker is increased due to the fact that the reverse magnetizing time is too long through the time delay on-off action of the time relay KT. Generally, the on-off delay time of the time relay KT is within 3 seconds to 3.6 seconds, and is selected mainly according to the size, thickness and material of the workpiece, and will not be described herein again.

In this embodiment, the adjusting unit includes a multi-gear switch SA2, and an intermediate relay KA1, an intermediate relay KA2 and an intermediate relay KA3 that are controlled to be turned on by different gears of the multi-gear switch SA2, where each intermediate relay is connected in series with a resistor R1, a resistor R2 and a resistor R3 that have different resistances, and when SA2 controls a certain intermediate relay KA to be turned on, the resistance of the path is changed, so that the suction cup working current can be adjusted when the gear of SA2 is changed. Therefore, the suction force of the sucker can be directly adjusted without repeated magnetization and demagnetization processes, so that the working procedure time is saved, and the element loss caused by repeated magnetization and demagnetization is reduced.

In the embodiment, SA2 is a three-step switch, and intermediate relays KA1, KA2 and KA3 and resistors R1, R2 and R3 have a series connection path relationship, so that when SA2 is changed, only one intermediate relay and one resistor path can be ensured to be conducted at a time. In another implementation manner, the resistors can also be connected in series or in parallel at the SA2 in a gear position larger than third gear to generate a richer resistance conversion effect, which is not described herein again.

It is understood that the multi-step switches SA1 and SA2 in this embodiment are preferably rotary switches, and may also be band switches or toggle switches, which are not described herein again.

It can be understood that, in the present embodiment, the undervoltage relay KUD and the undercurrent relay KAD are provided as protection units, and are mainly used for the demagnetization protection of the suction cup YH.

It can understand ground, because electromagnet's operating voltage and operating current are all very big, consequently produce the temperature rise effect easily, and high temperature has then aggravated circuit element's ageing, and the operating voltage and the operating current of sucking disc also can reduce gradually thereupon, after operating voltage and operating current fall to a certain degree, can cause the magnetic loss phenomenon that the work piece can't adsorb, and this can cause serious potential safety hazard. Here, set up undervoltage relay KUD and undercurrent relay KAD, undervoltage relay KUD and undercurrent relay KAD control the work power supply disconnection of the workstation that sucking disc and sucking disc correspond the station when the operating voltage or the operating current of sucking disc YH reduce, make the workstation that sucking disc and sucking disc correspond the station stop work, prevent that the work piece departure from causing the bodily injury accident, realize the function of magnetic loss protection.

It should be noted that the undervoltage relay KUD and the undercurrent relay KAD are not directly controlled but controlled by the control circuit of the suction cup YH, specifically, the oil pump control circuit of the suction cup YH and the worktable is cut off, so that the driving motor of the suction cup YH and the worktable is stopped, and the suction cup YH and the worktable are stopped until the engineer manually resumes the operation. For the related circuits and the specific implementation of the circuits, detailed descriptions thereof are omitted.

Further, in order to absorb the surge pulse when the KM1 or KM2 is turned off, a resistor R4 and a capacitor C are further provided in series with the suction cup YH at the positive and negative terminals of the working power supply. Because when magnetizing, the sucking disc has stored a large amount of magnetic field energy, when magnetizing and demagnetizing the conversion, DC power supply's polarity changes in the twinkling of an eye, can produce a large amount of self-induced electromotive force in the sucking disc YH, even arouses electric arc to fire, and through setting up the RC discharge circuit that resistance R4 and electric capacity C constitute, can utilize electric capacity C to absorb peak pulse voltage, utilize resistance consumption peak pulse current simultaneously, avoid circuit elements such as sucking disc coil to be burnt out.

Furthermore, the RC discharge circuit and the sucker coil can also form an oscillation attenuation circuit of the RLC, and the RC discharge circuit and the sucker coil have a better demagnetizing effect on workpieces due to the consumption of magnetic field energy.

Therefore, it is thus clear that this neotype scheme just can carry out the demagnetization that fills of sucking disc through control switch SA1 to manual operation to just can carry out electromagnetism suction through control switch SA2 and adjust, need not to fill demagnetization process readjustment magnetism suction size repeatedly, still be provided with RC circuit and under-voltage undercurrent compensation electronic component on this basis and prevent the emergence of losing magnetism, whole controlling means's circuit structure is simple easy-to-use, has better practical value.

The present invention is not limited to the above-described embodiments, and it is to be understood that modifications and variations can be made by one of ordinary skill in the art without creative efforts in accordance with the concept of the present invention. In summary, the technical solutions available to those skilled in the art through logic analysis, reasoning or limited experiments based on the present invention are all within the scope of protection defined by the claims.

Claims

1. The utility model provides a grinding machine electromagnet controlling means which characterized in that mainly includes: the device is sequentially provided with a control unit, a rectifying unit, a regulating unit and a protecting unit which are electrically connected; the control unit comprises a multi-gear switch SA1, a contactor KM1, a contactor KM2 and a time relay KT, wherein the contactor KM2 and the time relay KT are controlled to be attracted by the multi-gear switch SA 1; the contactor KM1 and the contactor KM2 are respectively used for controlling magnetization and demagnetization of the sucker; the time relay KT is connected with the contactor KM2 in series and used for controlling demagnetization time; the adjusting unit comprises a multi-gear switch SA2 and a plurality of intermediate relays which are controlled to be attracted by the multi-gear switch SA2, and each intermediate relay is connected with a resistor with different resistance values in series, so that the working current of the sucking disc can be adjusted when the SA2 gear changes; the protection unit comprises an undervoltage relay KUD and an undercurrent relay KAD, and is used for the magnetic loss protection of the sucker.

2. The electromagnetic chuck control device of the grinding machine as claimed in claim 1, wherein the contactor KM1 and the contactor KM2 are respectively used for controlling the magnetizing and demagnetizing of the chuck, and specifically comprise:

3. A grinder electromagnetic chuck control device as claimed in claim 2, wherein the chuck is magnetized or demagnetized based on the polarity of the operating voltage, specifically comprising:

4. A grinder electromagnetic chuck control device as claimed in claim 1, wherein the rectifying unit comprises:

a transformer TC and a rectifier bridge UR.

5. A grinder electromagnetic chuck control device as claimed in claim 1, wherein the loss of field protection specifically comprises:

6. A grinder electromagnetic chuck control device as claimed in claim 5, wherein the protection unit further comprises:

7. A grinder electromagnetic chuck control device as claimed in claim 1, characterized in that the on-off delay of the time relay KT is 3.5 seconds.