CN217868987U - Automatic water temperature control system of heat treatment water tank - Google Patents

Abstract

The utility model discloses an automatic control system for the water temperature of a heat treatment water tank, which comprises two water tanks for quenching, wherein the lower parts of the two water tanks are communicated through a connecting pipe, and the upper parts of the two water tanks are respectively provided with a water level gauge for measuring the water level and transmitting a water level signal to a controller; the connecting pipe is connected with a water pump; a vertical flat pipe is connected between the two water tanks; the flat tube is communicated with a rotary valve; the rotary valve comprises a shell and a rotary valve plate; the shell traverses the connecting flat pipe and communicates the upper layer water in one water tank with the lower layer water in the other water tank through the rotation of the rotary valve plate; the controller is used for controlling the water pump to supply water according to the received water level electric signal and controlling the rotation of the rotary valve plate by controlling the stepping motor. The utility model discloses do not need personnel on duty, the water level lifting that causes when utilizing the work piece to dip the basin opens as the basis is automatic stops, and the upper hot water in the automatic drainage basin is supplemented cold water and temperature automatically, avoids directly discharging and the water waste that leads to.

Description

Automatic water temperature control system of heat treatment water tank

Technical Field

The utility model belongs to the technical field of quenching heat treatment of metal components, and relates to a heat treatment water tank water temperature automatic control system.

Background

Quenching is a heat treatment process in which steel is heated to a temperature above the critical temperature, held for a certain period of time, and then cooled at a rate greater than the critical cooling rate to obtain an unbalanced structure mainly composed of martensite (or bainite or single-phase austenite is obtained as necessary). A common quenching method is to rapidly cool a heated steel member by immersing the steel member in a cooling water bath. In order to keep the water temperature in the water tank within the allowable range of quenching, after each workpiece quenching is finished, cold water is added to cool the water tank through manual control, and meanwhile, redundant hot water enters a municipal pipe network through a drainage pipeline to be discharged through manual control. The problem of this kind of control water temperature mode is: 1. the hot water is discharged, water resources are wasted, and the cost is increased; 2. when the workpiece is quenched in the water tank, the water temperature of the upper layer is high, the up-and-down convection is not easy to form, the fluctuation of the water temperature is large, the metallographic structure and the hardness of the upper part and the lower part of the workpiece are not consistent, and the quenching quality is influenced; 3. the temperature measurement, the opening and closing of the valves for water feeding and water discharging are carried out manually, so that workers need to be close to the water tank for operation, and the labor intensity is high; especially for the quenching of large-scale work pieces, the work pieces are large in size, a large amount of heat is contained after heating, after the work pieces are immersed in a water tank, the water temperature rises quickly, when the work pieces are quenched in the water tank, a cold water valve needs to be opened to neutralize the water temperature, workers need to watch at the side of the water tank, the working condition is bad, and the body health is affected.

Disclosure of Invention

In order to overcome not enough in the background art, the utility model provides a heat treatment basin temperature automatic control system, aim at utilizes the water level lifting that causes when the work piece soaks the basin as the basis, and the design can be automatically discharged the upper hot water in the basin to automatic control system who supplyes cold water avoids personnel on duty, reduces intensity of labour. Meanwhile, the cooling water in the water tank should be recycled as much as possible, so that water resource waste caused by direct discharge is avoided.

In order to achieve the above purpose, the utility model provides a following technical scheme:

an automatic water temperature control system for a heat treatment water tank comprises two water tanks for quenching, namely a first water tank and a second water tank; the lower parts of the two water tanks are communicated through a connecting pipe; a water pump is connected to the connecting pipe and used for supplying water in one water tank to the other water tank; a vertical flat pipe is connected between the two water tanks and is used for communicating the upper water layer and the lower water layer in the two water tanks; the two water tanks are respectively provided with a water level gauge for measuring water level and converting the water level into a water level signal to be transmitted to the controller;

the flat tubes are communicated with a rotary valve; the rotary valve comprises a cylindrical shell with two closed ends and a rotatable rotary valve plate inside the shell; the shell is transversely connected with the flat tubes and used for forming a pair of arc-shaped interfaces which are symmetrical left and right on the circumferential side of the shell;

the rotary valve plate body is in a circular tube shape; a pair of notches which are symmetrical up and down are arranged on the pipe wall, a web plate used for torque connection with a stepping motor is arranged on the inner side of the pipe wall, the outer side surface of the pipe wall is attached to the inner wall of the shell and used for communicating upper-layer water in one water tank with lower-layer water in the other water tank when the pair of notches are respectively aligned to the upper part and the lower part of the two arc-shaped interfaces through the rotation of the rotary valve plate;

the controller is used for controlling the water pump to supply water according to the received water level electric signal and controlling the rotation of the rotary valve plate by controlling the stepping motor.

As a further optimization, one axial end of the shell is provided with a detachably connected end cover; a rotatable rotating shaft is inserted in the through hole in the center of the end cover; a sleeve is arranged at the center of the web plate;

one end of the rotating shaft extends into the shell and is connected with the web plate in a torque mode through being inserted into the sleeve, and the other end of the rotating shaft is located outside the shell and provided with a driven gear; the driven gear is meshed with a driving gear preset on an output shaft of the stepping motor and used for driving the rotary valve plate to rotate through the rotation of the output shaft of the stepping motor; the stepping motor is fixedly connected to the outer side of the end cover and electrically connected with the controller, and is used for controlling the rotation of an output shaft of the stepping motor by the controller.

As a further optimization, the water pump is a bidirectional water pump, and is used for supplying water in any one water tank to the other water tank; the controller is used for controlling the water supply direction of the bidirectional water pump according to the received electric signal.

As a further optimization, the controller is installed on the upper surface of the water pump.

As a further optimization, the cooling device further comprises a cooler, wherein the cooler is connected to the connecting pipe and is used for cooling the flowing water in the connecting pipe.

Preferably, the number of the coolers is two, and the coolers are respectively located between the first water tank and the water pump and between the second water tank and the water pump.

As a further optimization, the bottoms of the first water tank and the second water tank are respectively provided with a first drainage hole and a second drainage hole for drainage; and the side walls of the first water tank and the second water tank are respectively provided with a first water filling hole and a second water filling hole for water injection.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) The water level lifting caused when the workpiece is immersed in the water tank is used as a base to automatically start and stop, the hot water in the upper layer of the water tank can be automatically discharged, the cold water and the water temperature can be automatically supplemented, the attendance of personnel is not needed, and the labor intensity is reduced.

(2) The two water tanks can be used alternately, and the water storage devices which are mutually discharged avoid water resource waste caused by direct discharge to a sewage pipeline.

(3) The two water tanks act together, so that the water volume is large, the water flows circularly, the rising speed of the water temperature is reduced, and the neutralization water temperature is easy to control.

(4) The water level difference is in direct proportion to the volume of the workpiece, so that the system can automatically adapt to the size of the workpiece; the larger the workpiece is, the larger the water level difference is, the working time of the water pump is automatically prolonged, and the water flow exchange of the two water tanks is more sufficient; on the contrary, when the workpiece is small, cold water does not need to be supplemented excessively, the working time of the water pump is automatically shortened, and the waste of cold water resources is avoided.

(5) Automatically adapting to discharge of upper-layer high-temperature water during selective quenching; in other words, high-temperature water at the upper layer is preferentially discharged all the time in the quenching water tank, so that the water temperature is more uniform, and the quenching quality is stable;

in a word, the system does not need personnel to watch, utilizes the water level lifting caused when the workpiece is immersed into the water tank as a base to automatically start and stop, automatically discharges the hot water at the upper layer in the water tank, automatically supplements the cold water and the water temperature, and avoids water resource waste caused by direct discharge.

Drawings

Fig. 1 is a schematic three-dimensional structure diagram of embodiment 1 of the present invention;

fig. 2 is a schematic view of an installation structure and an internal structure of a rotary valve according to embodiment 1 of the present invention;

fig. 3 is a schematic view of a water level state in an initial state in use according to embodiment 1 of the present invention;

fig. 4 is a schematic view of a water head difference just before a workpiece enters a first water tank according to embodiment 1 of the present invention;

FIG. 5 is a schematic view showing a state after water level equilibrium in the case of quenching a workpiece according to embodiment 1 of the present invention;

fig. 6 is a schematic view of the water level difference when the workpiece is just pulled out of the first water tank according to embodiment 1 of the present invention;

fig. 7 is a schematic diagram of a work flow of the controller according to embodiment 1 of the present invention.

In the figure: 1, a first water tank, 11, a first drainage hole, 12, a first water feeding hole, 2, a second water tank, 21, a second drainage hole, 22, a second water feeding hole, 3 connecting pipes, 4 water pumps, 5 flat pipes, 6 rotary valves, 61 shells, 62 rotary valve plates, 621 webs, 622 gaps, 623 sleeves, 63 arc-shaped connectors, 64 stepping motors, 641 driving gears, 65 end covers, 66 rotary shafts, 661 driven gears, 7 water level gauges, 71 floating balls, 8 controllers, 9 coolers and 10 workpieces; wherein the arrows indicate the direction of the water flow.

Detailed Description

The technical solutions in the embodiments of the present invention will be described below clearly and completely in conjunction with the drawings of the present invention, and it is obvious that the described embodiments are only some of the preferred embodiments of the present invention, not all of the embodiments. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In addition, in the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Example 1: please refer to fig. 1-7;

the utility model provides a following technical scheme: an automatic water temperature control system of a heat treatment water tank comprises two water tanks for quenching, namely a first water tank 1 and a second water tank 2, wherein the bottoms of the first water tank 1 and the second water tank 2 are respectively provided with a first drainage hole 11 and a second drainage hole 21 for drainage; the side walls of the first water tank 1 and the second water tank 2 are respectively provided with a first water filling hole 12 and a second water filling hole 22 for water injection. Therefore, the two water tanks have independent water inlet and outlet functions, and one of the water tanks can be independently replaced with water. Of course, each of the water filling hole and the water discharging hole is connected with a pipeline and a valve equipped on the pipeline. The two water tanks are filled with cooling water of the same water level in an initial state.

In order to communicate the two water tanks, a vertical flat pipe 5 is connected between the two water tanks and is used for communicating the upper-layer water and the lower-layer water in the two water tanks; then, when the high-temperature workpiece 10 is soaked in one of the water tanks, the flat pipe 5 is communicated with a rotary valve 6 in order to discharge the high-temperature water on the upper layer in the water tank into the other water tank; the rotary valve 6 comprises a cylindrical body, a shell 61 with two closed ends and a rotatable rotary valve plate 62 in the shell; the outer shell 61 transversely connects the flat tubes 5, and is used for forming a pair of arc-shaped connectors 63 which are symmetrical left and right on the circumferential side of the outer shell 61; the body of the rotary valve plate 62 is in a circular tube shape; a pair of notches 622 which are symmetrical up and down are arranged on the pipe wall, a web 621 used for torque connection of the stepping motor 64 is arranged on the inner side of the pipe wall, the outer side surface of the pipe wall is attached to the inner wall of the shell 61 and used for connecting the upper water layer in one water tank with the lower water layer in the other water tank when the notches 622 are aligned to the upper part and the lower part of the arc-shaped connector 63 respectively through the rotation of the rotary valve plate 62.

The principle of discharging the high-temperature upper water in one water tank into the other water tank is as follows: in this embodiment, as shown in fig. 4, the water tank for soaking the workpiece 10 is the first water tank 1, and the second water tank 2 serves as a reservoir for replenishing cold water to the first water tank 1 and a discharge container for high-temperature water from the first water tank 1. Since the work 10 is soaked in the first water tank 1 where quenching is performed, the water level rises higher than the initial water level of the second water tank 2 where the work 10 is not present; at this moment, the notch 622 located above is aligned with the upper layer water in the first water tank 1, the notch 622 located below is aligned with the lower layer water in the second water tank 2, and by utilizing the principle of a communicating vessel, the upper layer water in the first water tank 1 flows through the flat pipe 5, the arc-shaped interface 63 close to the first water tank 1 and the notch 622 located above and then enters the shell 61, and then flows through the notch 622 located below, the arc-shaped interface 63 close to the second water tank 2 and the flat pipe 5 and then enters the second water tank 2. Therefore, the upper water of the system is discharged automatically without power. And is not discharged into the municipal pipe through the first drain hole 11 and is not wasted. The rotary valve plate 62 as a water flow hub becomes a key control mechanism for selecting the direction of discharging the upper layer water, in other words, the rotation angle of the rotary valve plate 62 is a key factor for controlling the flow direction of the high temperature upper layer water.

While discharging the upper water in the first water tank 1, the lower parts of the two water tanks are communicated through a connection pipe 3 in order to supplement cold water to the inside thereof to neutralize the water temperature; a water pump 4 is connected to the connection pipe 3 for supplying water in one of the water tanks to the other water tank. At this time, since water is supplied to first water tank 1 having a high water level, water pump 4 is provided in connection pipe 3, and cold water in second water tank 2 is pumped and supplied to first water tank 1.

It will be appreciated that the two key actions of the system to control the water flow are, respectively, the rotation of the valve plate 62 to select the direction of the water flow and the selection of the water supply direction by the water pump 4 to supply water to the first reservoir 1 at a high water level. Through controlling the water flow direction between the two water tanks, the cold water in the second water tank 2 is supplemented into the first water tank 1, and the high-temperature water on the upper layer in the first water tank 1 is discharged into the second water tank 2, so that the water in the two water tanks flows in a circulating manner and acts on the quenched workpiece 10 together, the quenching water quantity is actually increased, and the water temperature is ensured to be automatically controlled within a reasonable range. Therefore, the circulation flow avoids direct discharge and water source waste. Thus, the workpiece 10 can be quenched so that the two water tanks can be used alternately. The water pump 4 is a bidirectional water pump and is used for supplying water in any one water tank to the other water tank; the above control function is provided to the controller 8 for controlling the water supply direction of the bidirectional water pump.

The operating principle of the controller 8 of the present embodiment is: in order to enable the rotation angle of the rotary valve plate 62 and the water supply direction of the water pump 4 to be controlled and automatically performed, it is necessary to collect signals of the water levels in the two water tanks. Therefore, a water level meter 7 is arranged in each of the two water tanks and is used for measuring the water level and converting the water level into an electric signal to be transmitted to a controller 8; the water level meter 7 comprises a floating ball 71, a top rod is fixedly connected to the floating ball 71, when the floating ball 71 rises and falls due to water level change, a sensor connected above the top rod obtains a height position signal of the floating ball 71, and the height position signal is transmitted to the controller 8 through a wire; the controller 8 is used for comparing the water level signals in the two water tanks according to the received electric signals, so that which water tank is high in water level can be judged, and the water pump 4 is controlled to supply water to the first water tank 1 with high water level; meanwhile, the positions of the two floating balls 71 can be determined by obtaining the two water level differences, so as to control the rotation angle of the rotary valve plate 62 to correspond to the water level differences, and optionally, when the two notches 622 are respectively aligned with the corresponding positions of the two floating balls 71, the notch 622 located above can be always aligned with the upper water in the first water tank 1 with high water level.

And controlling the rotation of the rotary valve plate 62 is achieved by the controller 8 controlling the stepper motor 64. For this purpose, one axial end of the housing 61 is provided with a detachably connected end cover 65; a rotatable rotating shaft 66 is inserted in the through hole in the center of the end cover 65; the center of the web 621 is provided with a sleeve 623; one end of the rotating shaft 66 extends into the shell 61 and is connected with the web 621 through being inserted in the sleeve 623 in a torque manner, and the other end of the rotating shaft is positioned outside the shell 61 and is provided with a driven gear 661; the driven gear 661 is engaged with a driving gear 641 preset on the output shaft of the stepping motor 64, and is configured to drive the rotary valve plate 62 to rotate through the rotation of the output shaft of the stepping motor 64; the step motor 64 is fixedly connected to the outer side of the end cover 65, and is electrically connected to the controller 8, so that the rotation of the output shaft of the step motor 64 is controlled by the controller 8.

In order to arrange the controller 8 in a safe and reliable position, the controller 8 is mounted on the upper surface of the water pump 4. So that the controller 8 as a control unit is far away from the two water tanks, and is safer and more reliable.

As a further optimization, a cooler 9 is further included, and the cooler 9 is connected to the connecting pipe 3 and is used for cooling the flowing water in the connecting pipe 3. The two coolers 9 are respectively positioned between the first water tank 1 and the water pump 4, and between the second water tank 2 and the water pump 4. Therefore, when the water in the second water tank 2 is pumped into the first water tank 1, the water temperature is lower after two times of cooling, and the water temperature is more favorably neutralized. Meanwhile, the cooling water can be reused, and the discharge and waste are reduced.

When the water tank is used, as shown in fig. 3 in an initial state, the two notches 622 are horizontally arranged in a bilateral symmetry mode, the two water tanks are communicated, the water levels are the same, and the controller 8 is powered on and started. At this time, the stepping motor 64 and the water pump 4 are in a stop standby state.

When the heated workpiece 10 enters the first water bath 1, as shown in fig. 4, the water level of the first water bath 1 rises, and the initial water level of the second water bath 2 is maintained. The controller 8 starts the motor 64 to rotate according to the detected water level difference signal, so as to drive the rotary valve plate 62 to rotate, so that the notch 622 located above points to the upper layer water of the first water tank 1 with a high water level, and the notch 622 located below points to the second water tank 2 with a low water level, so that the upper layer hot water of the first water tank 1 flows into the second water tank 2 under the action of the water level difference. At the same time, the controller 8 starts the water pump 4 to supply water to the first water tank 1 based on the detected water level difference signal. Therefore, the first water tank 1 and the second water tank 2 are both in a flowing state of draining water and feeding water at the same time, and the uniformity of water temperature is favorably ensured; the temperature of the cold water supplied from the second water tank 2 is automatically controlled to rise. Of course, the water discharging capacity of the gap 622 is larger than the water supplying capacity of the connection pipe 3 to ensure the continuous circulation flow. The simple method is that the inner space of the flat pipe 5 is set to be 1.5 to 2 times of the inner diameter of the connecting pipe 3. The water levels of the two water tanks are gradually balanced and consistent as shown in fig. 5.

And the process of gradually balancing the water levels of the two water tanks is also the process of quenching the workpiece 10 in the first water tank 1. Since the first water tank is in a flowing state of draining water and feeding water at the same time, the speed of water level balance is reduced, and the workpiece 10 has an opportunity to be always in flowing cooling water. When the equilibrium state shown in fig. 5 is reached, although the water levels of the two sinks are raised, since the controller 8 does not detect the water level difference and controls the stepping motor 64 and the water pump 4 to return to the stop standby state, the two notches 622 also return to the original horizontal state. At this time, the water in the two water tanks is fully exchanged, and the temperature is basically the same, so that the water does not need to continuously circulate. And the quenching time of the common steel piece is about 30 seconds, and the common steel piece does not stay in the first water tank 1 for too long.

When the workpiece 10 is fished out of the first tank 1, as shown in fig. 6, the water level of the first tank 1 drops, while the second tank 2 remains at a high water level, generating a water head. The controller 8 controls the water pump 4 to supply water to the second water tank 2 based on the detected water level difference. Meanwhile, the controller 8 controls the rotary valve plate 62 to rotate according to the detected water level difference, so that the two water tanks are communicated and are in a flowing state of draining water and feeding water at the same time; the water circulating through the connection pipe 3 is cooled while gradually returning to the initial state. Therefore, in the process that the water levels of the two water tanks are gradually balanced and consistent, the water in the two water tanks has enough opportunity to obtain cooling and prepare for the next quenching. At this time, the two water tanks have independent water inlet and outlet functions. Before next quenching, the two notches 622 can be driven to be distributed up and down, so that the flat pipes 5 are closed, and the water in the two water tanks can be independently replaced. Therefore, in another embodiment, the rotary valve plate 62 with two notches 622 distributed up and down can be used as an initial state to facilitate water exchange.

Accordingly, the control work flow of the controller 8 of the present embodiment is schematically shown in fig. 7.

It should be noted that the water temperature is automatically controlled within a reasonable range. Because the initial temperature of a common steel part is 800-1000 ℃, the heating temperature of the alloy material is higher, and the water temperature factors influencing the quenching quality mainly include the cooling speed and the uniformity of the workpiece 10. Therefore, the allowable range of the quenching water temperature is wide. The inventor finds out through practice that when the water temperature before quenching of the common steel part is below 40 ℃, a satisfactory crystalline phase structure can be obtained after quenching. Therefore, the main purpose of temperature control is to avoid the overhigh water temperature, and the temperature can be automatically controlled below 40 ℃. Therefore, the system can ensure that the water temperature is automatically controlled within a reasonable range by obtaining enough cold water supplement and heat exchange when the cooling water circularly flows. In addition, compared with a common method for regulating and controlling cold water supplement through a temperature sensor, the water temperature during quenching rises quickly, water flow in a water tank is disturbed violently, the reaction of water temperature measurement is slow, the error is large, and the supplement time and the water quantity of the cold water are difficult to accurately control; in the embodiment, the time for water supplement is controlled by measuring the water level difference, so that the error of water level measurement is small, the reaction is fast, the high-temperature upper-layer water is accurately discharged, and the method is more reasonable and efficient.

It should be further noted that the present embodiment has been described only focusing on the principle of the present system, and details, such as wires for connecting electric wires, connectors, flanges for connecting pipelines, bolts, rotating motor for driving the water pump 4, etc., technical features such as notches, grooves, angles, dimensions, etc. for avoiding movement interference, and technical measures such as temperature and humidity for ensuring normal operation of the present system, etc., are not omitted, but these details do not relate to the operation principle of the present system, and are all the prior art, and are not described in detail.

The embodiment has the advantages that:

(1) By using the water level lifting caused when the workpiece 10 is immersed in the water tank as a basis, the upper-layer hot water in the water tank can be automatically discharged, the cold water and the water temperature can be automatically supplemented, the attendance of personnel is not needed, and the labor intensity is reduced.

(2) The two water tanks can be used alternately, and the water storage devices which are used for discharging each other avoid water resource waste caused by direct discharging to a sewage pipeline.

(3) The two water tanks work together, so that the water volume is large, the water flows circularly, the rising speed of the water temperature is reduced, and the neutralization water temperature is easy to control.

(4) Because the water level difference is in direct proportion to the volume of the workpiece 10, the system can automatically adapt to the size of the workpiece 10; the larger the workpiece 10 is, the larger the water level difference is, the working time of the water pump 4 is automatically prolonged, and the water flow exchange of the two water tanks is more sufficient; on the contrary, the work piece is 10 hours, do not need to supplement cold water excessively, the operating time of the water pump 4 shortens automatically, avoid causing the waste of cold water resource.

(5) Automatically adapting to discharge of upper-layer high-temperature water during selective quenching; in other words, high-temperature water at the upper layer is preferentially discharged all the time in the quenching water tank, so that the water temperature is more uniform, and the quenching quality is stable;

in a word, the system does not need to be attended by personnel, utilizes the water level lifting caused when the workpiece 10 is immersed in the water tank as a basis, automatically discharges the upper hot water in the water tank, automatically supplements the cold water and the water temperature, and avoids water resource waste caused by direct discharge.

The part of the utility model which is not detailed is the prior art; for a person skilled in the art, various technical features of the embodiments described above may be combined arbitrarily, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, however, as long as there is no contradiction between the combinations of the technical features, the combinations should be considered as the scope of the present description. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (7)

1. The utility model provides a thermal treatment basin water temperature automatic control system, includes two basins that are used for quenching, is first basin (1) and second basin (2) respectively, its characterized in that: the lower parts of the two water tanks are communicated through a connecting pipe (3); a water pump (4) is connected to the connecting pipe (3) and is used for supplying water in one water tank to the other water tank; a vertical flat pipe (5) is connected between the two water tanks and is used for communicating the upper layer water and the lower layer water in the two water tanks; water level gauges (7) are arranged in the two water tanks and used for measuring water levels, converting the water levels into water level electric signals and transmitting the water level electric signals to a controller (8);

the flat pipe (5) is communicated with a rotary valve (6); the rotary valve (6) comprises a shell (61) which is cylindrical in body and closed at two ends and a rotatable rotary valve plate (62) in the shell; the outer shell (61) is transversely connected with the flat tubes (5) and is used for forming a pair of arc-shaped interfaces (63) which are symmetrical left and right on the circumferential side of the outer shell (61);

the rotary valve plate (62) body is in a circular tube shape, a pair of notches (622) which are symmetrical up and down are arranged on the tube wall of the rotary valve plate, a web plate (621) which is used for connecting a stepping motor (64) with torque is arranged on the inner side of the tube wall, the outer side surface of the tube wall is attached to the inner wall of the shell (61), and the rotary valve plate (62) is used for communicating the upper water in one water tank with the other water tank through the rotation of the rotary valve plate (62);

the controller (8) is used for controlling the water pump (4) to start and stop according to the received water level electric signal and controlling the rotation of the rotary valve plate (62) by controlling the stepping motor (64).

2. The automatic control system for water temperature in heat treatment water tank according to claim 1, wherein: one axial end of the shell (61) is provided with a detachably connected end cover (65); a rotatable rotating shaft (66) is inserted in a through hole in the center of the end cover (65); the center of the web plate (621) is provided with a sleeve (623);

one end of the rotating shaft (66) extends into the shell (61) and is connected with the web plate (621) in a torque manner by being inserted into the sleeve (623), and the other end of the rotating shaft is positioned outside the shell (61) and is provided with a driven gear (661); the driven gear (661) is meshed with a driving gear (641) preset on an output shaft of the stepping motor (64) and is used for driving the rotary valve plate (62) to rotate through the rotation of the output shaft of the stepping motor (64); the stepping motor (64) is fixedly connected to the outer side of the end cover (65), and is electrically connected with the controller (8), and the rotation of the output shaft of the stepping motor (64) is controlled by the controller (8).

3. The automatic water temperature control system for a thermal treatment basin as claimed in claim 2, wherein: the water pump (4) is a bidirectional water pump and is used for supplying water in any one water tank to the other water tank; and the controller (8) is used for controlling the water supply direction of the bidirectional water pump according to the received water level electric signal.

4. The automatic control system for water temperature in heat treatment water tank of claim 3, wherein: the controller (8) is installed on the upper surface of the water pump (4).

5. The automatic control system for water temperature in heat treatment water tank according to claim 4, wherein: the cooling device is characterized by further comprising a cooler (9), wherein the cooler (9) is connected to the connecting pipe (3) and used for cooling the flowing water in the connecting pipe (3).

6. The automatic water temperature control system for a thermal treatment basin of claim 5, wherein: the two coolers (9) are respectively positioned between the first water tank (1) and the water pump (4) and between the second water tank (2) and the water pump (4).

7. The automatic control system for water temperature in heat treatment water tank of claim 6, wherein: the bottoms of the first water tank (1) and the second water tank (2) are respectively provided with a first drainage hole (11) and a second drainage hole (21) for drainage; and a first water filling hole (12) and a second water filling hole (22) for water injection are respectively formed in the side walls of the first water tank (1) and the second water tank (2).

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