A multi-stage heat exchange box and control method

Abstract

The invention relates to the technical field of mechanical processing cooling devices, and in particular to a multi-stage heat exchange box and a control method, comprising a box body, wherein a heat exchanger is arranged in the box body; the heat exchanger comprises a U-shaped tube and a heat sink; all the heat sinks constitute an integral body A; the U-shaped tube comprises an end portion one and an end portion two; all the end portions one constitute a liquid return group, and all the end portions two constitute a liquid inlet group; the outer cover of the liquid return group is provided with a liquid return structure, and the outer cover of the liquid inlet group is provided with a liquid inlet structure; the liquid return structure is configured to: after collecting the coolant flowing out of all the end portions one, introduce it into the machine tool coolant input end through the outlet end, and monitor the temperature of the coolant flowing out of the outlet end; the liquid inlet structure is configured to: according to the cooling demand, synchronously introduce the coolant output from the machine tool coolant output end into each end portion two through the inlet end, and monitor the temperature of the coolant flowing into the inlet end; two heat dissipation fans are installed on the box body; the invention can effectively dissipate the heat of the coolant from the machine tool, and the heat dissipation efficiency is adjustable.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing cooling devices, and in particular to a multi-stage heat exchange box and a control method. Background Art

[0002] During the machining process, machining friction, cutting heat and motor operation will generate a lot of heat. If this heat cannot be effectively dissipated and controlled, it will cause the equipment to overheat, affect the machining accuracy, and even damage the machine tool parts. During the heat dissipation process of the machine tool, since there are many structures in the machine tool that need to dissipate heat, some machine tools will install a liquid cooling system to dissipate the heat of the machine tool.

[0003] The liquid cooling system uses coolant to dissipate heat from the machine tool. That is, the coolant flows through the machine tool to remove the heat inside, so that the machine tool is kept within the target temperature range to ensure processing accuracy.

[0004] However, as the machine tool's working hours continue to increase, the heat generated by the machine tool will gradually increase, and the coolant temperature with a fixed heat dissipation efficiency will also gradually rise. Therefore, it is necessary to cool the coolant flowing out of the machine tool to ensure that the temperature of the coolant entering the machine tool is lower than the machine tool temperature, so as to facilitate the removal of heat from the machine tool later.

[0005] Some prior arts use a method of directly blowing air or introducing air into a radiator to achieve the purpose of cooling the coolant flowing out of the machine tool.

[0006] However, the above methods all have the defect of fixed heat dissipation efficiency. When the temperature of the input coolant gradually rises, it is difficult to keep the output coolant within the target temperature range, thereby affecting the machining accuracy of the machine tool. Summary of the invention

[0007] In view of the deficiencies of the prior art, the present invention provides a multi-stage heat exchange box and a control method to solve the technical problem in the prior art that the temperature of the coolant input into the machine tool is difficult to accurately control.

[0008] In a first aspect of the present invention, there is provided a multi-stage heat exchange box, comprising a box body, wherein a placement cavity is provided in the box body;

[0009] A heat exchanger is provided in the placement cavity;

[0010] The heat exchanger comprises A horizontally arranged U-shaped tube and a number of vertically arranged heat sinks. ;

[0011] All heat sinks constitute a whole A;

[0012] The U-shaped tube includes two side arms, a middle arm, end one and end two;

[0013] The U-shaped tubes are arranged in sequence in the vertical direction;

[0014] All the middle arms are arranged outside the first end of the whole A;

[0015] The ends of all the side arms that are away from the corresponding middle arms penetrate the whole body A and communicate with the space outside the second end of the whole body A;

[0016] All the end 1s constitute a liquid return group, and all the end 2s are arranged in sequence at equal intervals in the vertical direction and constitute a liquid inlet group;

[0017] The outer cover of the liquid return group is provided with a liquid return structure, and the outer cover of the liquid inlet group is provided with a liquid inlet structure;

[0018] The liquid return structure is configured to: collect the coolant flowing out of all the ends and then introduce it into the machine tool coolant input end through the outlet end, and monitor the temperature of the coolant flowing out of the outlet end;

[0019] The liquid inlet structure is configured to: according to the cooling demand, the coolant output from the machine tool coolant output end is synchronously introduced into the machine tool coolant through the inlet end. The coolant introduced into the inlet end is placed in the second end and the temperature of the coolant flowing into the inlet end is monitored; There is no end portion 2 that is not introduced with coolant between the adjacent end portions 2 of the two ends, and the end portions introduced with coolant One of the two ends is located at the outermost of all the two ends, and the other two ends are closed. ;

[0020] The top and the bottom of the placement cavity are provided with heat dissipation holes connected to the external space of the box body, and a heat dissipation fan is installed in each heat dissipation hole;

[0021] A heat dissipation grille is installed on the side of the placement cavity;

[0022] The liquid return structure, liquid inlet structure and heat dissipation fan are all connected to a controller installed on the box body.

[0023] Furthermore, the liquid inlet structure includes an inlet end, a liquid inlet housing, a temperature sensor, a motor, a driving wheel, gears and fluid inlet;

[0024] The liquid inlet housing cover is arranged outside the liquid inlet group and forms a cavity A with the whole A;

[0025] The cavity A is provided with a plurality of rotating parts at equal intervals in the vertical direction. The gears are each covered with one end and two gears are meshed with each other; the gears are numbered in sequence, and from top to bottom they are gear No. 1, gear No. 2, gear No. 3, gear No. 4, gear No. 5, gear No. 6, gear No. 7, gear No. 8, gear No. 9, gear No. 10, gear No. 11, gear No. 12, gear No. 13, gear No. 14, gear No Number of gears;

[0026] The driving wheel is rotatably mounted in cavity A and is connected to No. 1 or Gears are meshed;

[0027] The driving wheel is also connected to a motor installed outside the liquid inlet housing;

[0028] The gears are provided with equal-angle spacings around their axes. A liquid inlet hole; ;

[0029] The distribution position of each inlet hole on the whole of all gears satisfies: When the coolant is introduced into the two ends, Two of the ends are respectively connected to a liquid inlet hole on the corresponding gear, and the remaining two ends are closed by the corresponding gear; wherein, The second end is self- The ends corresponding to the gears are selected in sequence along the extending direction of the liquid inlet group;

[0030] The inlet end is installed outside the liquid inlet housing and communicates with the cavity A, and a temperature sensor 1 is installed thereon;

[0031] The motor and the temperature sensor are connected to the controller respectively.

[0032] Further, the liquid return structure includes a lead-out end, a liquid return housing and a second temperature sensor;

[0033] The liquid return housing cover is arranged outside the liquid return group and forms a cavity B with the whole body A;

[0034] The outlet end is installed outside the liquid return housing and communicated with the cavity B, on which a second temperature sensor is installed.

[0035] Furthermore, the end of the lead-out end facing away from the liquid return housing passes through the box body and is arranged outside the box body, and the temperature sensor 2 is installed on the part arranged outside the box body;

[0036] The part of the lead-out end arranged in the box body and the liquid return housing form an integral body B, and the integral body B is covered with a heating device, and the heating device is connected to the controller.

[0037] Furthermore, the heating device is arranged in an independent cavity in the box body.

[0038] Furthermore, heat dissipation channels are provided at the top and the bottom of the independent cavity, and a movable plate for opening and closing is installed in each heat dissipation channel.

[0039] Furthermore, a pressure valve is installed in the end portion 1; the pressure valve is configured to open when the pressure in the corresponding U-shaped tube exceeds a preset value.

[0040] A second aspect of the present invention further provides a method for controlling the temperature of a machine tool coolant using the above-mentioned multi-stage heat exchange box, the control method comprising:

[0041] Acquire the monitoring data of temperature sensor 1 and temperature sensor 2 at the current moment. If the monitoring data of temperature sensor 1 at the current moment is higher than the set value A, perform step A to make the monitoring data of temperature sensor 2 within the target range;

[0042] Step A includes:

[0043] According to the monitoring data of temperature sensor 1 and temperature sensor 2, the number of end 2s that need to be opened at the current moment is obtained , according to the number of opening , control the motor rotation, so that The ends corresponding to the gear No. are selected in sequence along the extension direction of the liquid inlet group. The two ends are coaxially distributed with a liquid inlet hole on the corresponding gear respectively;

[0044] According to the monitoring data of temperature sensor 1 and temperature sensor 2, the number of cooling fans required to be turned on at the current moment is obtained, and the corresponding number of cooling fans are turned on; wherein, when the number turned on is 1, the two cooling fans are operated alternately.

[0045] Furthermore, the control method further comprises:

[0046] If the monitoring data of temperature sensor 1 at the current moment is lower than the set value B, then proceed to step B to make the monitoring data of temperature sensor 2 within the target range;

[0047] Step B includes:

[0048] The heating device is controlled to heat the entire B.

[0049] Furthermore, if the monitoring data of temperature sensor 1 at the current moment is lower than the set value B, the heat dissipation channel is closed first, and then step B is performed to make the monitoring data of temperature sensor 2 within the target range. After the monitoring data of temperature sensor 2 is within the target range, the heat dissipation channel is opened.

[0050] Beneficial effects of the present invention:

[0051] 1. By setting The U-shaped tube and liquid inlet structure enable the equipment to select different numbers of U-shaped tubes to participate in heat dissipation according to needs, effectively improving the heat dissipation efficiency and achieving the purpose of adjustable heat dissipation efficiency;

[0052] 2. The setting of dual cooling fans can increase the heat dissipation capacity of the equipment on the one hand, and on the other hand, it can disturb the surface of the heat exchanger, making it easier to clean the equipment and ensure heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a three-dimensional diagram of a multi-stage heat exchange box shown in Example 1;

[0054] Figure 2 It is a three-dimensional diagram of a multi-stage heat exchange box shown in Example 1 with the box cover removed;

[0055] Figure 3 is a schematic structural diagram of the heat exchanger in Example 1;

[0056] Figure 4 It is an exploded diagram of the liquid inlet structure, liquid return structure and heat exchanger as a whole;

[0057] Figure 5 This is a three-dimensional diagram of the box cover.

[0058] In the figure:

[0059] 1. Box body; 2. Placement cavity; 3. Heat exchanger; 4. Heat sink; 5. U-shaped tube; 6. End 1; 7. End 2; 8. Export end; 9. Import end; 10. Heat dissipation hole; 11. Cooling fan; 12. Controller; 13. Liquid inlet shell; 14. Temperature sensor 1; 15. Liquid inlet hole; 16. Liquid return shell; 17. Temperature sensor 2; 18. Independent chamber; 19. Pressure valve; 20. Gear; 21. Motor; 22. Driving wheel; 23. Box cover; 24. Fixing rod; 25. Motor slot. DETAILED DESCRIPTION

[0060] The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that it is easy for those with ordinary skills in the prior art to implement these embodiments. However, the present invention can also be implemented in various different forms. Therefore, the present invention is not limited to the embodiments described below. In addition, in order to more clearly describe the present invention, parts that are not connected with the invention will be omitted from the accompanying drawings.

[0061] In order to solve the technical problems in the prior art that affect the machining efficiency of machine tools when air cooling or fixed radiators are used to dissipate heat from machine tool coolants, such as fixed heat dissipation efficiency, untimely heat dissipation of high-temperature coolant, and substandard coolant temperature after heat dissipation, the present invention provides a multi-stage heat exchange box for solving the above problems.

[0062] In order to facilitate the understanding of the technical solution of the present application, the technical solution of the present application will be described in detail below in conjunction with specific embodiments and the accompanying drawings of the specification.

[0063] Example 1

[0064] Combined with Figure 1-5 This embodiment provides a multi-stage heat exchange box, including a box body 1, in which a placement cavity 2 is provided for placing a heat exchanger 3.

[0065] A box cover 23 is installed on the box body 1 to facilitate opening or closing the placement cavity 2;

[0066] In order to facilitate the heat dissipation of the heat exchanger 3, heat dissipation holes 10 are respectively opened on the top and bottom of the box body 1, and a heat dissipation fan 11 is installed in each heat dissipation hole 10; the two can be selectively opened as needed; the heat dissipation hole 10 on the top of the box body 1 is opened on the box cover 23.

[0067] Among them, in order to facilitate the rapid discharge of heat when the two cooling fans 11 are turned on at the same time, a cooling grille is also installed on the side wall of the placement cavity 2 to quickly discharge the hot air from the placement cavity 2; the cooling grille is not shown in the figure (located on the front and rear side walls of the box body 1).

[0068] In order to change the heat dissipation efficiency of the heat exchanger 3 according to the needs, in this embodiment, the components of the heat exchanger 3 include A horizontally arranged U-shaped tube 5 and a plurality of vertically arranged heat sinks 4, In this embodiment .

[0069] like Figure 2 and 3 , each heat sink 4 is vertically arranged in the placement cavity 2, and is connected to each other through a fixing rod 24 to form a whole; wherein all the heat sinks 4 constitute a whole A.

[0070] The U-shaped tubes 5 are horizontal, and all the U-shaped tubes 5 are arranged in sequence at equal intervals from top to bottom in the vertical direction.

[0071] The U-shaped tube 5 is composed of two side arms, a middle arm, end one 6 and end two 7.

[0072] End 1 6 and end 2 7 are the open ends of the two side arms respectively; the other end of each side arm is connected to an end of the corresponding middle arm respectively.

[0073] like Figure 2 All the middle arms are arranged on the right side of the whole A, and the open ends of all the side arms pass through the whole A and are connected with the space on the left side of the whole A; wherein, end one 6, end two 7 and the left side wall of the whole A are coplanar, so as to facilitate the later adjustment of the coolant input and output.

[0074] Among them, all the end portions 6 are arranged in sequence in the vertical direction to form a liquid return group, and all the end portions 7 are arranged in sequence at equal intervals in the vertical direction to form a liquid inlet group.

[0075] Secondly, the outer cover of the liquid return group is provided with a liquid return structure that fits with the whole A, and the outer cover of the liquid inlet group is provided with a liquid inlet structure that fits with the whole A.

[0076] in:

[0077] The liquid return structure is configured as follows: the coolant flowing out of all the ends 6 is collected and introduced into the coolant input end of the machine tool through the outlet end 8, and the temperature of the coolant flowing out of the outlet end 8 is monitored.

[0078] The liquid inlet structure is configured to: according to the cooling requirements, the coolant output from the machine tool coolant output end is synchronously introduced into the coolant inlet through the inlet end 9 The coolant introduced into the coolant is placed in the second end 7 and the temperature of the coolant flowing into the introduction end 9 is monitored; There is no end 27 to which the coolant is not introduced between the adjacent end 27 of the end 27, and the end 27 to which the coolant is introduced One of the ends 27 is located at the outermost side of all the ends 27, and the other ends 27 are closed. .

[0079] That is, the two end portions 7 into which the coolant is introduced are adjacent to each other in pairs, and one of the two end portions 7 is located at the outermost end of all the two end portions 7 .

[0080] The liquid return structure, the liquid inlet structure, and the heat dissipation fan 11 are all connected to a controller 12 installed on the box body 1 .

[0081] That is, the controller 12 controls the operation of the device.

[0082] When the above equipment is running, the controller 12 controls the liquid return structure, the liquid inlet structure and the cooling fan 11; the process of controlling the temperature of the machine tool coolant by the control equipment includes:

[0083] The controller 12 obtains the monitoring data of the coolant flowing into the inlet end 9 of the liquid inlet structure at the current moment, and then determines whether it exceeds the set value A (the set value A is pre-set, such as 35°, etc.) based on the obtained monitoring data. If it exceeds, step A is performed to make the temperature data of the coolant flowing out of the outlet end 8 detected by the liquid return structure within the target range (for example, 28° to the set value A, at this time the set value A=35°).

[0084] Wherein, step A is:

[0085] The controller 12 obtains the temperature data of the coolant flowing out of the outlet end 8 monitored by the return structure and the monitoring data of the coolant flowing into the inlet end 9 of the inlet structure, and obtains the number of the end 27 that should be opened at the current moment according to the two monitoring data. , and based on the number of , control the action of the liquid inlet structure, so that the The two ends 7 are opened and connected to the inlet end 9, so the coolant output from the machine tool coolant output end can be introduced into the liquid inlet structure through the inlet end 9 and then flow into the opened The coolant flowing into the two ends 7 passes through the corresponding After the U-shaped tube 5 and the whole A are cooled, the corresponding The liquid flows out from the end 6 and finally flows into the coolant input end of the machine tool through the outlet end 8 on the liquid return structure.

[0086] In order to improve the heat dissipation efficiency, step A further includes:

[0087] The controller 12 obtains the number of cooling fans 11 required to be turned on according to the temperature data of the cooling liquid flowing out of the outlet end 8 monitored by the liquid return structure and the monitoring data of the cooling liquid flowing into the inlet end 9 of the liquid inlet structure, and then turns on the cooling fans 11 according to the determined number of cooling fans 11 to be turned on; wherein, when a cooling fan 11 is selected to be turned on, it can be turned off after one cooling fan 11 has been turned on for a certain period of time, and the other cooling fan 11 can be turned on, thereby ensuring the stable operation of the equipment and increasing the disturbance effect of the wind flow; and when both cooling fans 11 are turned on, the above settings are not required. When the two cooling fans 11 are turned on synchronously, the wind flow after absorbing heat flows out through the cooling grille; when one cooling fan 11 is turned on, the wind flow after absorbing heat flows out through the cooling grille and the cooling hole 10 where the other cooling fan 11 is located.

[0088] The controller 12 obtains the temperature data of the coolant flowing out of the outlet 8 monitored by the return structure and the monitoring data of the coolant flowing into the inlet 9 of the inlet structure, and obtains the number of the end 27 that should be opened at the current moment according to the two monitoring data. The methods include:

[0089] When the difference between the temperature data of the coolant flowing out of the outlet end 8 monitored by the liquid return structure and the monitoring data of the coolant flowing into the inlet end 9 of the liquid inlet structure is small, and the temperature data of the coolant flowing out of the outlet end 8 monitored by the liquid return structure is higher than the set range data, it means that the heat dissipation of the coolant is poor at this time, and the current heat dissipation efficiency cannot meet the heat dissipation demand. In this way, the coolant can be quickly cooled down by increasing the number of openings of the end two 7, increasing the speed and opening number of the cooling fan 11, etc.

[0090] When the temperature data of the coolant flowing out of the outlet end 8 monitored by the liquid return structure is within the target range and remains stable, and the difference between the temperature data of the coolant flowing out of the outlet end 8 monitored by the liquid return structure and the monitoring data of the coolant flowing into the inlet end 9 in the liquid inlet structure remains stable, the current heat dissipation efficiency can be maintained, that is, the number of the currently opened ends 7, the number of fans opened and the speed, etc. can be maintained.

[0091] That is, the controller 12 dynamically adjusts the opening quantity of the end 2 7 and the opening quantity and speed of the cooling fan 11 according to the temperature data of the coolant flowing out of the outlet end 8 monitored by the return liquid structure and the monitoring data of the coolant flowing into the inlet end 9 in the liquid inlet structure, so as to realize dynamic adjustment of the heat dissipation efficiency to ensure that the temperature of the coolant flowing into the coolant input end of the machine tool through the outlet end 8 is within the target range.

[0092] Among them, the control strategy can also be: preferentially turn on one cooling fan 11 and maintain a low rotation speed. When the cooling efficiency needs to be increased, first execute the strategy of increasing the number of end two 7 turned on until the cooling demand is met; when the number of end two 7 turned on reaches the maximum and still cannot meet the cooling demand, then execute the strategy of increasing the rotation speed of the cooling fan 11. If a single cooling fan 11 still cannot meet the cooling demand, finally execute the strategy of turning on two cooling fans 11 for cooling. When turning on two cooling fans 11 for cooling, on the premise of meeting the cooling demand, execute a low-power opening strategy, for example, keep the same and low rotation speed.

[0093] The above strategies can effectively reduce the power consumption of the device.

[0094] Combined with Figure 4 In this embodiment, the liquid inlet structure includes an inlet end 9, a liquid inlet housing 13, a temperature sensor 14, a motor 21, a driving wheel 22, a liquid inlet hole 15 and gears; The gears are numbered from top to bottom as gear 1, gear 2, etc. Number gear.

[0095] Wherein, the liquid inlet housing 13 is disposed outside the liquid inlet group and forms a cavity A with the whole A;

[0096] In cavity A, gears No. 1, No. 2, etc. are installed in sequence in the vertical direction. Number of gears, and adjacent gears 20 mesh with each other; each gear 20 covers one end 27.

[0097] The driving wheel 22 is also rotatably mounted in the cavity A and is connected to the No. 1 or The gears are meshed to synchronously drive all gears 20 to rotate.

[0098] like Figure 4 In this embodiment, the driving wheel 22 is meshed with gear No. 1.

[0099] The driving wheel 22 is also connected to a motor 21 installed outside the liquid inlet housing 13 . The motor 21 is used to drive the driving wheel 22 to rotate forward and reverse, and is installed in a motor slot 25 in the box body 1 .

[0100] in, The gears are provided with equal-angle spacings around their axes. Liquid inlet hole 15; 1 .

[0101] As shown in the figure, in this embodiment, Correspondingly, gear No. 1 is provided with one liquid inlet hole 15, gear No. 2 is provided with two liquid inlet holes 15, and gear No. 3 is provided with three liquid inlet holes 15.

[0102] Combined with Figure 4 The liquid inlet holes 15 on each gear 20 are opened at equal intervals. For example, in this embodiment, the interval angle is 120°. Since gear No. 1 has only one liquid inlet hole 15, this setting is not necessary; the angle formed by the centers of the two liquid inlet holes 15 on gear No. 2 and the axis of the gear 20 is 120°, and the angle formed by the centers of the two adjacent liquid inlet holes 15 on gear No. 3 and the axis of the corresponding gear 20 is also 120°.

[0103] The liquid inlet holes 15 on each gear 20 are coaxially distributed with the corresponding end 2 7 during the rotation of the corresponding gear 20, and when coaxially distributed, the corresponding end 2 7 is connected with the cavity A, and the corresponding end 2 7 is opened.

[0104] The opening position of each liquid inlet hole 15 on the corresponding gear 20, and the relative arrangement position of each liquid inlet hole 15 relative to all gears 20 as a whole satisfy:

[0105] When the liquid inlet hole 15 on the No. 1 gear is connected to the corresponding end 2 7, all other gears 20 have a liquid inlet hole 15 connected to the corresponding end 2 7, and at this time all U-shaped tubes 5 are used for heat dissipation;

[0106] When the liquid inlet hole 15 on the No. 1 gear is not connected to the corresponding end 2 7, the maximum A U-shaped tube 5 is used for heat dissipation, and when When the U-shaped tube 5 is used for heat dissipation, all the gears 20 below the No. 1 gear have a liquid inlet hole 15 connected to the corresponding end 2 7.

[0107] Correspondingly, when necessary When the U-shaped tube 5 is used for heat dissipation, Starting from gear No. 1, select in sequence in the direction of the liquid inlet group The gears 20 are selected such that each of the selected gears 20 has a liquid inlet hole 15 connected to the corresponding end 2 7 , while the liquid inlet holes 15 on the remaining gears 20 are not connected to the corresponding end 2 7 .

[0108] Among them, the opened The end 7, in this embodiment, is The end portions 27 corresponding to the gears 20 are selected in sequence along the extension direction of the liquid inlet group, and any selected end portions 27 are driven by the motor 21 to rotate until they are coaxially distributed with the liquid inlet hole 15 on the corresponding gear 20, while the other end portions 27 are closed by the corresponding gears 20.

[0109] In order to monitor the corresponding temperature, in this embodiment, the inlet end 9 is installed outside the liquid inlet housing 13 and is connected to the cavity A, on which a temperature sensor 14 is installed, and the motor 21 and the temperature sensor 14 are respectively connected to the controller 12.

[0110] That is, the controller 12 obtains the monitoring data of the temperature sensor 14 and controls the rotation of the motor 21 to adjust the number of the U-shaped tubes 5 involved in heat dissipation.

[0111] In this embodiment, the liquid return structure includes a lead-out end 8, a liquid return housing 16 and a temperature sensor 17; wherein:

[0112] The liquid return housing 16 is disposed outside the liquid return group and forms a cavity B with the whole A;

[0113] The outlet end 8 is installed outside the liquid return housing 16 and communicated with the cavity B, and a temperature sensor 17 is installed thereon.

[0114] The temperature sensor 2 17 is connected to the controller 12 and is used to feedback the temperature of the coolant flowing out of the device.

[0115] Through the above settings, a control method for a multi-stage heat exchange box to control the temperature of a machine tool coolant provided in this embodiment includes:

[0116] The controller 12 obtains the monitoring data of the temperature sensor 1 14 and the temperature sensor 2 17 at the current moment. If the monitoring data of the temperature sensor 1 14 at the current moment is higher than the set value A, step A is performed to make the monitoring data of the temperature sensor 2 17 within the target range;

[0117] Step A includes:

[0118] The controller 12 obtains the number of the end portions 7 that need to be opened at the current moment according to the monitoring data of the temperature sensor 14 and the temperature sensor 2 17. , according to the number of opening , control the motor 21 to rotate, Each of the two ends 7 is coaxially distributed with a liquid inlet hole 15 on the corresponding gear 20, and the other unselected two ends 7 are still closed by the corresponding gear 20;

[0119] Secondly, the controller 12 also obtains the number of cooling fans 11 required to be turned on at the current moment based on the monitoring data of temperature sensor 14 and temperature sensor 2 17, and turns on the corresponding number of cooling fans 11, while controlling the rotation speed of the cooling fans 11; during the turning on of the cooling fans 11, as mentioned above, when one cooling fan 11 is turned on, they are turned on alternately, and when two cooling fans 11 are turned on, they are not turned on alternately.

[0120] Through the above-mentioned setting, the heat dissipation efficiency of the coolant can be effectively adjusted, thereby avoiding the disadvantages existing when the heat dissipation efficiency is fixed, which helps to ensure the processing accuracy of the machine tool.

[0121] Secondly, in order to further improve the heat dissipation efficiency, a pressure valve 19 is installed in each end 6. The pressure valve 19 is configured to open when the pressure in the corresponding U-shaped tube 5 reaches a set value, allowing the coolant therein to flow out.

[0122] Through the above arrangement, there is coolant in each U-shaped tube at any time, so when the tube is needed to participate in cooling, the coolant in it can flow out quickly to participate in the circulation flow.

[0123] This can effectively avoid the disadvantage that when the empty U-shaped tube starts to participate in the cooling of the coolant, the coolant pressure in the machine tool is easily reduced.

[0124] Example 2

[0125] Reference Figure 2 , some machine tools need to be within the set temperature range to ensure the best processing effect. However, due to the weather, installation environment, etc., some machine tools have a low ambient temperature, which causes the disadvantage of affecting the processing accuracy due to the machine tool temperature being lower than the target range when the machine tool is initially turned on for processing. Therefore, in this embodiment, on the basis of Example 1, the end of the lead-out terminal 8 facing away from the liquid return shell 16 passes through the box body 1 and is arranged on the outside of the box body 1, and a temperature sensor 17 is installed on the part arranged on the outside of the box body 1. At the same time, the part of the lead-out terminal 8 arranged in the box body 1 and the liquid return shell 16 constitute a whole B, and the whole B is covered with a heating device, and the heating device is connected to the controller 12.

[0126] In order to improve the heating efficiency, in some embodiments, the heating device is also arranged in an independent cavity 18 in the box body 1 to ensure the heating effect.

[0127] After the machine tool is started for a certain period of time, its own temperature gradually rises. At this time, it is not necessary to heat the coolant to increase the temperature of the machine tool, but it is necessary to cool down the cooling oil that exceeds the set value A. In this case, the heat in the independent cavity 18 needs to be dissipated as soon as possible to avoid affecting the cooling of the coolant. Therefore, in some embodiments, the top and bottom of the independent cavity 18 are provided with heat dissipation channels;

[0128] In some embodiments, in order to improve the heat dissipation efficiency, each heat dissipation channel is partially overlapped with the adjacent heat dissipation hole 10, and a movable plate for opening and closing is installed in each heat dissipation channel.

[0129] That is, when heating is required, the movable plate closes the corresponding heat dissipation channel to close the independent cavity 18, thereby facilitating improving the heating efficiency of the heating device; after the heating is completed, the movable plate is opened to quickly dissipate the heat of the independent cavity 18 to avoid affecting the cooling efficiency of the coolant in the later stage.

[0130] Based on the heating device, the method for controlling the temperature of the machine tool coolant using a multi-stage heat exchange box provided in this embodiment, in addition to step A in embodiment 1, also includes:

[0131] If the controller 12 determines whether the monitoring data of the temperature sensor 1 14 at the current moment is lower than the set value B (for example, the set value B=28°), if so, step B is performed to make the monitoring data of the temperature sensor 2 17 within the target range: wherein step B includes:

[0132] The heating device is controlled to heat the entire B; after the heating is completed, the heating is stopped, and before heating, the movable plate is made to close the corresponding heat dissipation channel. After the heating is completed, the movable plate is opened to quickly dissipate the heat inside.

[0133] Through the above settings, the device can not only heat the machine tool below the set value B so that it can quickly heat up to the target range, but also ensure the cooling effect of the coolant by changing the heat dissipation efficiency, thereby effectively ensuring the processing accuracy of the machine tool.

[0134] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0135] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-stage heat exchange box, comprising a box body, It is characterized in that A placement cavity is provided in the box body; A heat exchanger is provided in the placement cavity; The heat exchanger comprises n horizontally arranged U-shaped tubes and a plurality of vertically arranged fins, n≥3; All heat sinks constitute a whole A; The U-shaped tube includes two side arms, a middle arm, end one and end two; n U-shaped tubes are arranged in sequence in the vertical direction; All the middle arms are arranged outside the first end of the whole A; The ends of all the side arms that are away from the corresponding middle arms penetrate the whole body A and communicate with the space outside the second end of the whole body A; All the end 1s constitute a liquid return group, and all the end 2s are arranged in sequence at equal intervals in the vertical direction and constitute a liquid inlet group; The outer cover of the liquid return group is provided with a liquid return structure, and the outer cover of the liquid inlet group is provided with a liquid inlet structure; The liquid return structure is configured to: collect the coolant flowing out of all the ends and then introduce it into the machine tool coolant input end through the outlet end, and monitor the temperature of the coolant flowing out of the outlet end; The liquid inlet structure is configured to: according to the cooling demand, the coolant output from the coolant output end of the machine tool is synchronously introduced into the m end twos through the introduction end, and the temperature of the coolant flowing into the introduction end is monitored; wherein, there is no end two that is not introduced into the coolant between the adjacent end twos among the m end twos introduced into the coolant, and one of the m end twos introduced into the coolant is at the outermost of all the end twos, and the other end twos are all closed, 1≤m≤n; The top and the bottom of the placement cavity are provided with heat dissipation holes connected to the external space of the box body, and a heat dissipation fan is installed in each heat dissipation hole; A heat dissipation grille is installed on the side of the placement cavity; The liquid return structure, liquid inlet structure and cooling fan are all connected to a controller installed on the box; Wherein, the liquid inlet structure includes an inlet end, a liquid inlet housing, a temperature sensor 1, a motor, a driving wheel, n gears and a liquid inlet hole; The liquid inlet housing cover is arranged outside the liquid inlet group and forms a cavity A with the whole body A; The cavity A is provided with n gears which are rotatably installed at equal intervals in the vertical direction, each gear covers one end portion, and adjacent gears are meshed with each other; the gears are numbered in sequence, and from top to bottom they are gear No. 1, gear No. 2, gear No. 3, gear No. 4, gear No. 5; The driving wheel is rotatably mounted in cavity A and meshes with gear No. 1 or No. n; The driving wheel is also connected to a motor installed outside the liquid inlet housing; Gear No. 1 is provided with l liquid inlet holes at equal intervals around its axis; 1≤l≤n; The distribution positions of the liquid inlet holes on the whole of all gears satisfy that: when the m end portions are introduced with coolant, the m end portions are respectively connected with one liquid inlet hole on the corresponding gear, and the remaining end portions are all closed by the corresponding gear; wherein the m end portions introduced with coolant are selected in sequence from the end portion corresponding to the nth gear and along the extension direction of the liquid inlet group; The inlet end is installed outside the liquid inlet housing and communicates with the cavity A, and a temperature sensor 1 is installed thereon; The motor and the temperature sensor are connected to the controller respectively.

2. A multi-stage heat exchange box according to claim 1, It is characterized in that The liquid return structure includes a lead-out end, a liquid return housing and a second temperature sensor; The liquid return housing cover is arranged outside the liquid return group and forms a cavity B with the whole body A; The outlet end is installed outside the liquid return housing and communicated with the cavity B, on which a second temperature sensor is installed.

3. A multi-stage heat exchange box according to claim 2, It is characterized in that The end of the lead-out end facing away from the liquid return housing passes through the box body and is arranged outside the box body, and the second temperature sensor is installed on the part of the lead-out end arranged outside the box body; The part of the lead-out end arranged in the box body and the liquid return housing form an integral body B, and the integral body B is covered with a heating device, and the heating device is connected to the controller.

4. A multi-stage heat exchange box according to claim 3, It is characterized in that The heating device is arranged in an independent cavity in the box body.

5. A multi-stage heat exchange box according to claim 4, It is characterized in that The top and bottom of the independent cavity are both provided with heat dissipation channels, and each heat dissipation channel is installed with a movable plate for opening and closing.

6. A multi-stage heat exchange box according to claim 1, It is characterized in that A pressure valve is also installed in the end portion 1; the pressure valve is configured to open when the pressure in the corresponding U-shaped tube exceeds a preset value.

7. A method for controlling the temperature of a machine tool coolant by using a multi-stage heat exchange box as claimed in claim 5 or 6, It is characterized in that The control method comprises: Acquire the monitoring data of temperature sensor 1 and temperature sensor 2 at the current moment. If the monitoring data of temperature sensor 1 at the current moment is higher than the set value A, perform step A to make the monitoring data of temperature sensor 2 within the target range; Step A includes: According to the monitoring data of temperature sensor 1 and temperature sensor 2, the number m of end 2s that need to be opened at the current moment is obtained, and according to the number m of openings, the motor is controlled to rotate so that the m end 2s selected in sequence from the end 2 corresponding to gear No. n along the extension direction of the liquid inlet group are respectively coaxially distributed with a liquid inlet hole on the corresponding gear; According to the monitoring data of temperature sensor 1 and temperature sensor 2, the number of cooling fans required to be turned on at the current moment is obtained, and the corresponding number of cooling fans are turned on; wherein, when the number turned on is 1, the two cooling fans are operated alternately.

8. The control method according to claim 7, It is characterized in that The control method also includes: If the monitoring data of temperature sensor 1 at the current moment is lower than the set value B, then proceed to step B to make the monitoring data of temperature sensor 2 within the target range: Step B includes: The heating device is controlled to heat the entire B.

9. The control method according to claim 8, It is characterized in that If the monitoring data of temperature sensor 1 at the current moment is lower than the set value B, the heat dissipation channel is closed first, and then step B is performed to make the monitoring data of temperature sensor 2 within the target range. After the monitoring data of temperature sensor 2 is within the target range, the heat dissipation channel is opened.

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