CN215058067U

CN215058067U - Hydraulic control circuit

Info

Publication number: CN215058067U
Application number: CN202121146536.6U
Authority: CN
Inventors: 王海杰; 刘怀伟; 王浩奇; 吕宁; 张吉祥; 向丹
Original assignee: CHENGDU XIWANG FOOD CO LTD
Current assignee: CHENGDU XIWANG FOOD CO LTD
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2021-12-07
Anticipated expiration: 2031-05-26

Abstract

The utility model relates to a hydraulic control technical field discloses a hydraulic control circuit for solve because of forgetting after the operating personnel starts and close, perhaps the switch damages the short circuit again, the long-time running problem of hydraulic motor who appears. The hydraulic motor of including hand switch, contactor, time relay and fryer oil pump, the contact of contactor with hydraulic motor's input is established ties, external power source is connected to hand switch's one end, hand switch's the other end is connected the coil of contactor, time relay's contact with the coil of contactor is established ties, time relay is used for working after the coil of contactor gets electricity, through time relay's contact time delay cuts off the coil input of contactor. The utility model is suitable for a various oil pump system, especially fryer oil pump.

Description

Hydraulic control circuit

Technical Field

The utility model relates to a hydraulic control technique, in particular to hydraulic control circuit.

Background

In the conventional hydraulic control of the oil pump of the fryer, as shown in fig. 1, the start and stop of a hydraulic motor are directly controlled by a manual switch SB, and because an operator needs to frequently operate the oil pump of the fryer during frying, the situation that the operator forgets to close the oil pump after starting the oil pump or the manual switch SB is damaged and short-circuited easily occurs. If the operator forgets to close after starting, or the manual switch SB is damaged and short-circuited, the coil KM1 of the contactor is electrified for a long time, so that the hydraulic motor M runs for a long time, and the following risks exist when the hydraulic motor M runs for a long time:

1. the motor is burnt;

2. the waste of electric energy is caused;

3. causing the hydraulic oil to heat up and causing hydraulic failure.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a hydraulic control circuit for solve because of forgetting after the operating personnel starts and close, perhaps the switch damages the short circuit again, the long-time running problem of hydraulic motor who appears.

The utility model provides a its technical problem, the technical scheme of adoption is: hydraulic control circuit, hydraulic motor including hand switch, contactor, time relay and fryer oil pump, the contact of contactor with hydraulic motor's input is established ties, external power source is connected to hand switch's one end, hand switch's the other end is connected the coil of contactor, time relay's contact with the coil of contactor is established ties, time relay is used for working after the coil of contactor gets electric, through time relay's contact time delay cuts off the coil input of contactor.

Specifically, the time relay may be an On-delay Operation (On-delay Operation) type time relay or a power-On delay Operation (With instant output).

When the time relay is an electrified delay time relay, the contact of the time relay is a normally closed contact, the normally closed contact is connected with the coil of the contactor in series to form a series circuit, and the series circuit is connected with the coil of the time relay in parallel.

When the time relay is an electrified delay time relay with instantaneous output, the contact of the time relay is a normally open contact, the normally open contact is connected with the coil of the contactor in series to form a series circuit, and the series circuit is connected with the coil of the time relay in parallel.

The beneficial effects of the utility model are that, the utility model discloses time relay has been added in the hydraulic control circuit, can set for hydraulic motor's operating time through time relay, even if forget after the fried operating personnel starts and close hand switch, perhaps hand switch damages the short circuit again, after time relay timing, hydraulic motor still can the bring to rest. Avoid the motor to run for a long time and burn out and long-time operation causes the power extravagant, also avoid the hydraulic oil that the long-time operation of oil pump motor arouses to heat up simultaneously, cause the hydraulic pressure inefficacy.

Drawings

Fig. 1 is a schematic diagram of a hydraulic control circuit of a conventional oil pump of an oil fryer.

Fig. 2 is a schematic diagram of a first hydraulic control circuit provided in an embodiment of the present invention.

Fig. 3 is a schematic diagram of a second hydraulic control circuit according to an embodiment of the present invention.

Wherein QF represents an air switch, FU represents a fuse, SB represents a manual switch, FR represents a thermal relay, KM1 represents a coil of a contactor, KM2 represents a contact of the contactor, KT1 represents a coil of a time relay, KT2 represents a normally closed contact of the time relay, and KT3 represents a normally open contact of the time relay.

Detailed Description

In order to avoid forgetting to close manual switch after starting because of operating personnel, perhaps manual switch damages the short circuit again, and the long-time running problem of fryer oil pump hydraulic motor that leads to, the utility model discloses a hydraulic control circuit, hydraulic motor including manual switch, contactor, time relay and fryer oil pump, the contact of contactor with hydraulic motor's input is established ties, external power source is connected to manual switch's one end, manual switch's the other end is connected the coil of contactor, time relay's contact with the coil of contactor is established ties, time relay is used for working after the coil of contactor gets electricity, through time relay's contact time delay cuts off the coil input of contactor.

Wherein, time relay can choose for use circular telegram time delay type time relay or take the circular telegram time delay type time relay of instantaneous output, describes in detail through the embodiment below the technical scheme of the utility model.

Example 1

The present embodiment provides a hydraulic control circuit for a fryer oil pump, as shown in fig. 2, comprising an air switch QF, a fuse FU, a thermal relay FR, a manual switch SB, a contactor, a time relay, and a hydraulic motor M of the fryer oil pump; in the main circuit, an air switch QF, a contact KM2 of a contactor, a contact of a thermal relay FR and an input end M of a hydraulic motor are connected in series with an industrial power supply; in the control branch, a fuse FU, a manual switch SB, a normally closed contact KT2 of a time relay, a coil KM1 of a contactor and a heating element of a thermal relay FR are connected in series to a power supply, and then a series circuit formed by the normally closed contact KT2 of the time relay and the coil KM1 of the contactor is connected in parallel with the coil KT1 of the time relay.

In this embodiment, the selected time relay is an On-delay Operation (On-delay Operation) type time relay, and the relay is characterized in that: the time relay starts time delay immediately after obtaining the input signal, and an execution part (namely a normally closed contact KT2) outputs a signal to operate a control circuit when the time delay is finished; when the input signal disappears, the relay immediately returns to the state before the action. Thus, the specific circuit principle of this embodiment is as follows:

1. firstly, setting time for delay control of a time relay, wherein time parameters of delay can be set according to actual production needs, such as 10 minutes;

2. when an oil pump of the fryer is required to work, an operator of the fryer closes a manual switch SB, at the moment, a normally closed contact KT2 of a time relay is in a closed state, a coil KM1 of a contactor and a coil KT1 of the time relay are both electrified, time delay is started after the coil KT1 of the time relay is electrified, meanwhile, the contact KM2 of the contactor is switched to be in a closed state, and a hydraulic motor is electrified M to start to run;

3. if an operator forgets to close the manual switch SB after starting, or the manual switch SB is damaged and short-circuited, after the time delay of the time relay is finished, the normally closed contact KT2 of the time relay is switched to an off state from an on state, at the moment, the coil KM1 of the contactor loses electricity, then the contact KM2 of the contactor is switched to an off state, and the hydraulic motor M loses electricity and stops running.

Example 2

The present embodiment provides a hydraulic control circuit for a fryer oil pump, as shown in fig. 3, comprising an air switch QF, a fuse FU, a thermal relay FR, a manual switch SB, a contactor, a time relay, and a hydraulic motor M of the fryer oil pump; in the main circuit, an air switch QF, a contact KM2 of a contactor, a contact of a thermal relay FR and an input end of a hydraulic motor M are connected in series with an industrial power supply; in the control branch, a fuse FU, a manual switch SB, a normally closed contact KT2 of a time relay, a coil KM1 of a contactor and a heating element of a thermal relay FR are connected in series with a power supply, and then a series circuit formed by the normally open contact KT3 of the time relay and the coil KM1 of the contactor is connected in parallel with the coil KT1 of the time relay.

In this embodiment, the selected time relay is a power-On delay (With act.contact On-delay Operation) type time relay With a snap output, and the relay is characterized in that: after the time relay obtains the input signal, the execution part (namely the normally open contact KT3) of the time relay immediately outputs a signal to operate the control circuit, the time delay is started, and after the time delay is finished, the normally open contact KT3 is restored to the original state. Thus, the specific circuit principle of this embodiment is as follows:

1. firstly, setting the time for delay control of a time relay, for example, 10 minutes;

2. when an oil pump of the frying machine is required to work, an operator of the frying machine closes the manual switch SB, the coil KT1 of the time relay is electrified, the normally open contact KT3 is immediately switched to a closed state from a disconnected state and begins to delay, the coil KM1 of the contactor can be electrified after the normally open contact KT3 is closed, then the contact switch KM2 of the contactor is switched to a closed state, and the hydraulic motor M is electrified to start running;

3. if an operator forgets to close the manual switch SB after starting, or the manual switch SB is damaged and short-circuited, after the time delay of the time relay is finished, the normally open contact KT3 of the time relay is switched to an off state from an on state, at the moment, the coil KM1 of the contactor is powered off, then the contact KM2 of the contactor is switched to an off state, and the hydraulic motor M is powered off and stops running.

The above embodiment is merely a preferred embodiment of the present invention, and is not intended to limit the present invention, and for those skilled in the art, modifications to the technical solutions described in the embodiments or equivalent replacements to some technical features thereof should be included in the protection scope of the present invention.

Claims

1. Hydraulic control circuit, hydraulic motor including hand switch, contactor and fryer oil pump, the contact of contactor with hydraulic motor's input is established ties, external power source is connected to hand switch's one end, hand switch's the other end is connected the coil of contactor, its characterized in that still includes time relay, time relay's contact with the coil of contactor is established ties, time relay is used for working after the coil of contactor gets electric, through time relay's contact time delay cuts off the coil input of contactor.

2. The hydraulic control circuit of claim 1, wherein the time relay is an energized time delay type time relay, and the contact of the time relay is a normally closed contact connected in series with a coil of the contactor to form a series circuit connected in parallel with the coil of the time relay.

3. The hydraulic control circuit of claim 1, wherein the time relay is a power-on time-delay type time relay with a snap-action output, and the contact of the time relay is a normally open contact which is connected in series with a coil of the contactor to form a series circuit, and the series circuit is connected in parallel with the coil of the time relay.