Temperature control device and system for mold

Abstract

The invention relates to a temperature control device and system for a mold, which are applied to the field of temperature control, and comprises an artware heating module, a mold heating module, a regulation and control module and a liquid supplementing and discharging module, by utilizing PID regulation, the preheating time of the mold can be shortened, the production efficiency is improved, the temperature can be accurately controlled, the product quality is stable, and the safety is improved. In addition, through cooperation of a variable plate and an electric telescopic rod, the thermal conductivity of the variable plate is adjusted through an electric field, dynamic adjustment of the cavity volume can be achieved, an isolated and low-heat-exchange space is provided for replacement of new cooling liquid and old cooling liquid in a fixed mold cavity, and energy waste caused by heat exchange during replacement of the new cooling liquid and the old cooling liquid is avoided; and the new cooling liquid wrapped in the heat insulation strip is squeezed, so that the maximum release of the new cooling liquid is promoted.

Description

Technical Field

[0001] The present invention relates to a temperature control device, and in particular to a temperature control device and system for a mold applied in the field of temperature control. Background Art

[0002] During the mold processing process, stamping and mold closing procedures will be carried out, and steam and boilers will be used to provide heat sources for the mold. However, the existing boilers have low thermal efficiency and large heat dissipation losses in the pipelines. However, due to the high cost of modifying the boilers and pipelines, they have not been eliminated yet. In addition, temperature control during boiler steam operation relies on manual experience, which can easily lead to product defects and affect precision.

[0003] The specification of Chinese invention patent CN102183976A discloses a mold temperature automatic control device and control method, which belongs to the field of SMC and BMC molding production. It is used for automatic constant temperature control of mold steam heating in molding production, so that the mold temperature remains stable during the product molding process.

[0004] In addition, the Chinese invention patent CN118268535B specification discloses a high-pressure die-casting mold temperature control device, which is equipped with an adjustment mechanism to automatically adjust the coolant flow rate, and can automatically adapt to temperature control of molds of different specifications.

[0005] Existing temperature control equipment usually uses the circulation flow of coolant to achieve continuous cooling operation during cooling treatment. However, in actual operation, the newly injected coolant will mix with the old coolant that has not been completely discharged. This will cause the old coolant being discharged to cool down, causing the newly injected coolant to be mixed with the old coolant and discharged, so that the cooling purpose of this part of the coolant cannot be achieved, which easily leads to waste of new coolant. Summary of the Invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is to realize the separate injection and discharge of new and old coolants during cooling on the basis of shortening the mold preheating time, thereby avoiding the waste of coolant.

[0007] To solve the above problems, the present invention provides a temperature control device for a mold, comprising a movable mold and a fixed mold, wherein a cavity is provided inside each of the movable mold and the fixed mold. An injection pipe 1 is installed on one side surface of the fixed mold, and the output end of the injection pipe 1 is connected to a branch pipe with a tail end extending into the cavity. Two discharge pipes 1 are installed on the other side surface of the fixed mold. An injection pipe 2, an exhaust pipe, and a discharge pipe 2 are installed through the top of the movable mold from left to right, respectively. A variable temperature insulation component is installed inside the cavity of the fixed mold. The variable insulation component includes five variable plates, which are respectively attached to the five inner walls of the cavity in the fixed mold. The adjacent variable plates are connected by thermal insulation strips. The variable plates are composed of two heat-conducting plates and a thermal insulation member located between the two heat-conducting plates. The interior of the variable plate is vacuum-treated. A drive motor is installed inside the variable plate, and the output end of the drive motor is connected to a bridge plate made of heat-conducting material. The surface of the fixed mold is installed with electric extension rods corresponding to the variable plates, and the power end of each electric extension rod is connected to the surface of the variable plate, and the surface of the variable plate close to the branch pipe side passes through the sliding surface and the tail end of the branch pipe. The interior of the thermal insulation strip is installed with a supplementary drain pipe with a built-in check valve, and the surface of the supplementary drain pipe is installed with an electronic valve.

[0008] In the above-mentioned mold temperature control device, PID adjustment is used to shorten the mold preheating time, improve production efficiency, and accurately control the temperature to achieve stable product quality and improved safety. In addition, the combination of the variable plate and the electric extension rod can avoid energy waste caused by heat exchange when replacing the old coolant with the new one.

[0009] As a further improvement of the present application, the thermal insulation strip is made of elastic material, and the surface of the thermal insulation strip is covered with elastic thermal insulation material. Five variable plates and the thermal insulation strips connected to the surface form a frame with an open top design.

[0010] As a further improvement of the present application, a sealing valve 1 is installed on the surface of the injection pipe 1, a pneumatic regulating valve 1 and a pressure sensor 1 are installed on the surface of one of the branch pipes, a pneumatic regulating valve 2 and a pressure sensor 2 are installed on the surface of the other branch pipe, a sealing valve 4 and a temperature sensor 1 are installed on the surface of one of the discharge pipes 1, and a sealing valve 5 and a temperature sensor 2 are installed on the surface of the other discharge pipe 1.

[0011] As a further improvement of the present application, a pneumatic regulating valve three, a sealing valve two and a pressure sensor three are installed on the surface of the injection tube two, a blowing tube is installed on the surface of the part of the injection tube two located in the movable mold, and a sealing valve three is installed on the surface of the blowing tube, a sealing valve six is ​​installed on the surface of the exhaust pipe, and a sealing valve seven is installed on the surface of the exhaust pipe two.

[0012] As a further improvement of the present application, two return pipes are installed on the other side surface of the fixed mold, and the tail end of the return pipe extends to the interior of the discharge pipe one, and one-way valves are installed inside the injection pipe one, injection pipe two, discharge pipe one, exhaust pipe, discharge pipe two and return pipe, and the installation position of the return pipe is located below the installation position of the branch pipe.

[0013] As a further improvement of the present application, when the variable plate expands outward, the driving motor drives the bridge plate to be placed vertically, and when the variable plate retracts, the driving motor drives the bridge plate to be placed at an angle and the ends of the bridge plate are respectively attached to the inner walls of the two heat conducting plates.

[0014] As another improvement of the present application, symmetrically arranged swing plates are installed on the inner wall of the cavity in the fixed mold through a rotating shaft, and symmetrically arranged micro electric telescopic rods are installed on the inner wall of the cavity in the fixed mold.

[0015] As another improvement supplement of the present application, the length of the swing plate is smaller than the straight-line distance between the rotating shaft and the variable plate, and the projection of the movable end of the micro electric telescopic rod overlaps with the swing plate in the unextended state.

[0016] As another improvement of the present application, a temperature control system includes a craft heating module, a mold heating module, a control module and a supplementary drainage module; The craft heating module is used to realize the heating operation inside the moving mold; The mold heating module is used to preheat the cavity in the fixed mold; The cooling control module is used to provide isolation when injecting new and old coolants into the cavity of the fixed mold; The supplementary drainage module is used to enable the coolant enclosed inside the thermal insulation strip to be discharged through the supplementary drainage pipe.

[0017] In summary, the present application utilizes PID regulation to shorten the preheating time of the mold, improve production efficiency, and accurately control the temperature to achieve stable product quality and improved safety. In addition, by utilizing the cooperation of the variable plate and the electric extension rod, the thermal conductivity of the variable plate itself is adjusted by the electric field, which can realize dynamic adjustment of the cavity volume, and provide an isolated and low-heat exchange space for replacing the old coolant with the new coolant in the fixed mold cavity, thereby avoiding energy waste caused by heat exchange when replacing the old coolant with the new coolant, and utilizing the swing plate and the electric extension rod to expel the new coolant wrapped in the insulation strip, thereby promoting the maximum release of the new coolant. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of this application; Figure 2 This is a schematic diagram of the internal structure of the movable mold of the first embodiment of this application; Figure 3 This is a schematic diagram of the installation of the return pipe and the electric extension pole according to the first embodiment of the present application; Figure 4 This is a schematic diagram of a pipeline and multiple valves on its surface according to the first embodiment of the present application; Figure 5 This is the installation diagram of the change plate, insulation strip and supplementary pipe of the second embodiment of this application; Figure 6 This is a schematic diagram of the expansion of the change plate according to the second embodiment of the present application; Figure 7 This is a schematic diagram of the process of replacing the old coolant with the new coolant according to the second embodiment of the present application; Figure 8 This is a schematic diagram of a state in which the coolant contained in the heat-insulating strip cannot be discharged on its own according to the second embodiment of the present application; Figure 9 This is a schematic diagram of the installation of the swing plate and the micro electric telescopic rod according to the second embodiment of the present application; Figure 10 This is a diagram showing the placement of the micro electric telescopic rod and the swing plate of the second embodiment of the present application when the liquid is enclosed in the heat insulation strip; Figure 11 This is a diagram showing the process of the micro electric telescopic rod and the swing plate cooperating to discharge the liquid contained in the heat insulation strip according to the second embodiment of the present application; Figure 12 This is a schematic diagram of the structure of the change plate according to the second embodiment of the present application; Figure 13 This is a schematic diagram of a state in which the bridge plate in the variable plate of the second embodiment of the present application is placed obliquely, resulting in the variable plate being able to conduct heat.

[0019] Description of the numbers in the figure: 1. Fixed mold; 2. Moving mold; 3. Electric extension rod; 4. Return pipe; 5. Injection pipe 1; 6. Injection pipe 2; 7. Discharge pipe 1; 8. Exhaust pipe; 9. Discharge pipe 2; 10. Thermal insulation strip; 11. Variable plate; 12. Supplementary discharge pipe; 13. Swing plate; 14. Micro electric telescopic rod; 50. Sealing valve 1; 51. Pneumatic control valve 1; 52. Pressure sensor 1; 53. Pneumatic control valve 2; 54. Pressure sensor 2; 61. Pneumatic control valve 3; 62. Sealing valve 2; 63. Pressure sensor 3; 64. Sealing valve 3; 71. Sealing valve 4; 72. Temperature sensor 1; 73. Sealing valve 5; 74. Temperature sensor 2; 81. Sealing valve 6; 91. Sealing valve 7; 111. Heat transfer plate; 112. Heat insulation; 113. Bridge plate. DETAILED DESCRIPTION

[0020] The following describes three implementation methods of the present application in detail with reference to the accompanying drawings.

[0021] The first implementation method: Figures 1-4A temperature control device for a mold is shown, comprising a movable mold 2 and a fixed mold 1, and a cavity is provided inside the movable mold 2 and the fixed mold 1. An injection pipe 5 is installed on one side surface of the fixed mold 1, and the output end of the injection pipe 5 is connected to a branch pipe with the tail end extending into the cavity. Two discharge pipes 7 are installed on the other side surface of the fixed mold 1. An injection pipe 2 6, an exhaust pipe 8 and a discharge pipe 2 9 are respectively installed through the top of the movable mold 2 from left to right. A sealing valve 1 50 is installed on the surface of the injection pipe 1 5, a pneumatic regulating valve 1 51 and a pressure sensor 1 52 are installed on the surface of one of the branch pipes, and a pneumatic regulating valve 2 53 and a pressure sensor 2 54 are installed on the surface of the other branch pipe. A sealing valve 4 71 and a temperature sensor 1 72 are installed on the surface of one of the discharge pipes 1 7, and a sealing valve 5 73 and a temperature sensor 2 74 are installed on the surface of the other discharge pipe 1 7.

[0022] The surface of the injection pipe 2 6 is installed with a pneumatic regulating valve 3 61, a sealing valve 2 62 and a pressure sensor 3 63. The surface of the injection pipe 2 6 located inside the movable mold 2 is installed with a blowing pipe, and the surface of the blowing pipe is installed with a sealing valve 3 64. The surface of the exhaust pipe 8 is installed with a sealing valve 6 81. The surface of the discharge pipe 2 9 is installed with a sealing valve 7 91.

[0023] Two return pipes 4 are installed on the other side surface of the fixed mold 1, and the tail end of the return pipe 4 extends to the inside of the discharge pipe 1 7. One-way valves are installed inside the injection pipe 1 5, injection pipe 2 6, discharge pipe 1 7, exhaust pipe 8, discharge pipe 2 9 and return pipe 4, and the installation position of the return pipe 4 is located below the installation position of the branch pipe.

[0024] Specifically, before connecting the steam, the pressure values ​​of pressure sensor 3 63, pressure sensor 1 52, and pressure sensor 2 54 are set according to the process instructions. After the mold is assembled, the sealing valve 1 50 is opened, and the opening degree of the pneumatic control valve 1 51 and the pneumatic control valve 2 53 is adjusted through PID according to the set values ​​of pressure sensor 1 52 and pressure sensor 2 54, and steam is injected into the cavity in the fixed mold 1 for rapid preheating. When the temperature of the temperature sensor 1 72 and the temperature sensor 2 74 is lower than the preset value, the sealing valve 4 71 and the sealing valve 5 73 are controlled to open to discharge the low-temperature steam in the cavity of the fixed mold 1; When providing steam heating for the movable mold 2, the pressure value of the pressure sensor 3 63 is set according to the process instruction manual. The pneumatic control valve 3 61 adjusts the opening degree through PID according to the set value of the pressure sensor 3 63. The sealing valve 2 62 is initially closed. When the press mold closing signal enters the control system, the sealing valve 2 62 is opened, the sealing valve 7 91 is closed, the sealing valve 6 81 is closed, steam is connected to the injection pipe 2 6, and the pressure holding time is set. After the time is up, the sealing valve 2 62 is closed, and the sealing valve 7 91 and the sealing valve 6 81 are opened to exhaust. (During the mold processing process, the pressure holding heating when the press is closing the mold can enable the thermosetting material to complete the cross-linking reaction under high temperature and high pressure to form a stable structure. In addition, the exhaust mainly releases volatile gases (such as moisture, air, and reaction by-products) generated during the curing or cooling of the material to prevent bubbles, burning or surface defects. It can also prevent product deformation or mold sticking due to sudden changes in internal air pressure when the mold is opened). When the mold is subsequently cooled, the injection pipe 1 5 and the injection pipe 2 6 may be connected to a cold zone liquid or cooling gas to assist the mold in cooling and solidifying.

[0025] If demoulding is not possible later, cold air is introduced into the second injection pipe 6 and the sealing valve 3 64 is opened to blow air for a set time, which can further balance the air pressure in the fixed mold 1, thereby promoting the demoulding operation.

[0026] Second implementation method: Figure 3 and Figure 5 as well as Figure 12 It is shown that a variable insulation component is installed inside the cavity of the fixed mold 1; the variable insulation component includes five variable plates 11, which are respectively attached to the five inner walls of the cavity of the fixed mold 1, and the adjacent variable plates 11 are connected by a thermal insulation strip 10, which includes two heat conducting plates 111 and a heat insulating member 112 located between the two heat conducting plates 111. The interior of the variable plate 11 is vacuum treated (the vacuum environment can be supplemented and maintained by an external vacuum pump), and a driving motor is installed inside the variable plate 11, and the output end of the driving motor is connected to a bridge plate 113 made of heat conducting material. The surface of the fixed mold 1 is installed with a heat conducting material connected to the variable plate. 11 correspond to the electric extension rods 3 one by one, and the power end of each electric extension rod 3 is connected to the surface of the variable plate 11, and the surface of the variable plate 11 close to the branch pipe side penetrates the surface of the sliding and the tail end of the branch pipe (even after the variable plate 11 is separated from the tail end of the branch pipe, the coolant will not leak into the inside of the variable plate 11, and the part where the variable plate 11 and the branch pipe projection overlap is a solid insulation area, and the bridge plate 113 is located in the hollow area below, so as to avoid the subsequent movement of the bridge plate 113 to encounter the influence of the branch pipe), a supplementary drain pipe 12 with a built-in check valve is installed inside the insulation strip 10, and an electronic valve is installed on the surface of the supplementary drain pipe 12.

[0027] The insulation strip 10 is made of elastic material, and the surface of the insulation strip 10 is covered with elastic insulation material (which can be silicone rubber, selected according to actual conditions). Five variable plates 11 and the insulation strip 10 connected to the surface form a frame with an open top design.

[0028] When the variable plate 11 is expanded, the driving motor drives the bridge plate 113 to be placed vertically. When the variable plate 11 is retracted, the driving motor drives the bridge plate 113 to be placed obliquely and the ends of the bridge plate 113 are respectively attached to the inner walls of the two heat conducting plates 111 (such as Figure 12-13 shown).

[0029] Specifically, when coolant is injected into the cavity of the fixed mold 1 (hereinafter referred to as the fixed cavity) for a circulating cooling operation, when the newly injected coolant replaces the old coolant in the fixed cavity, it takes a certain amount of time for the old coolant to be discharged. The new coolant injected first will mix with the remaining old coolant, causing a cooling effect on the old coolant. However, the old coolant needs to be discharged, which will cause part of the new coolant injected first to fail to complete the cooling purpose (discharged immediately after cooling the old coolant), which can easily lead to a waste of resources.

[0030] Therefore, when new coolant is injected into the fixed cavity through the injection pipe 15, the driving motor drives the bridge plate 113 to be placed vertically, and heat transfer cannot be formed between the two heat conducting plates 111. At this time, the new hot coolant on both sides of the variable plate 11 cannot exchange heat. Then the electric extension rod 3 is started to drive the variable plate 11 originally attached to the inner wall of the fixed cavity to expand outward. As the variable plate 11 expands outward, the old coolant can be separated, so that a space is formed between the inner wall of the fixed cavity and the variable plate 11, providing storage space for the newly injected coolant (such as Figure 6-Figure 7 As shown in the figure, the heat exchange between the new and old coolants cannot be achieved, which can reduce the heat exchange waste caused by mixing the new and old coolants when replacing them; When the variable plate 11 expands outward, the old coolant originally in the fixed cavity will be discharged from the interior of the fixed cavity through the return pipe 4 and the discharge pipe 7 at multiple points under the action of squeezing, so that the expansion of the variable plate 11 can be carried out stably.

[0031] After the old coolant is discharged, the electric extension rod 3 is used to push the variable plate 11 back and fit it to the inner wall of the fixed cavity, and the electronic valve is opened, so that the new coolant in the frame formed by the variable plate 11 and the insulation strip 10 can be discharged to the outside of the variable plate 11 through the supplementary drain pipe 12. In addition, the driving motor drives the bridge plate 113 to tilt, and the bridge plate 113 contacts the two heat conducting plates 111 to form heat transfer, which does not affect the subsequent heat exchange between the new coolant and the variable plate 11, and then indirectly performs cooling and heat exchange operations with the inner wall of the fixed cavity.

[0032] The five electric extension rods 3 and the variable plate 11 move synchronously, and the coolant is a non-corrosive material, which can avoid damage to the sealing between the insulation strip 10 and the variable plate 11.

[0033] Figure 9-10 As shown, the inner wall of the cavity of the fixed mold 1 is equipped with symmetrically arranged swing plates 13 through a rotating shaft, and the inner wall of the cavity of the fixed mold 1 is equipped with symmetrically arranged micro electric telescopic rods 14.

[0034] The length of the swing plate 13 is smaller than the straight-line distance between the rotating shaft and the variable plate 11 , and the projection of the movable end of the micro electric telescopic rod 14 overlaps with that of the swing plate 13 in the unextended state.

[0035] Specifically, because the variable plate 11 and the thermal insulation strip 10 first expand outward and then contract inward, when contracting inward, the stretched and bent thermal insulation strip 10 will contain part of the new coolant. As the level of the new coolant outside the variable plate 11 rises, part of the new coolant contained in the thermal insulation strip 10 cannot be discharged on its own (taking the longitudinally arranged thermal insulation strip 10 as an example, as the liquid level rises, the new coolant contained in the longitudinally arranged thermal insulation strip 10 cannot discharge the remaining new coolant through the replenishment pipe 12 on its own due to pressure problems, such as Figure 8 As shown), this problem cannot be solved even by adjusting the number and installation position of the supplementary pipes 12, so the cooperation of the swing plate 13 and the micro electric telescopic rod 14 is adopted.

[0036] Figure 11 It is shown that during the outward expansion of the variable plate 11, the micro-electric telescopic rod 14 retracts and the thermal insulation strip 10 stretches, which will drive the swing plate 13 to expand outward without affecting the outward expansion and stretching of the thermal insulation strip 10. When the variable plate 11 is re-attached to the inner wall of the fixed cavity, the micro-electric telescopic rod 14 extends, pushing the two swing plates 13 closer to each other, squeezing the new coolant wrapped in the stretched thermal insulation strip 10, and discharging it through the replenishing drain pipe 12, thereby prompting the new coolant wrapped in the thermal insulation strip 10 to be discharged as much as possible (there may be a small amount of residue, but because the residual amount is small, the impact can be ignored).

[0037] The third implementation method: A temperature control system includes a craft heating module, a mold heating module, a control module and a replenishing and draining module; The craft heating module is used to realize the heating operation in the movable mold 2; The mold heating module is used to preheat the cavity in the fixed mold 1; The cooling control module is used to provide isolation processing when injecting new and old coolants into the cavity of the fixed mold 1; The supplementary drainage module is used to enable the coolant enclosed inside the thermal insulation strip 10 to be discharged through the supplementary drainage pipe 12 .

[0038] Specifically, the pressure regulation method in the craft heating module and the mold heating module in this control system uses PID regulation. Various parameters can be set on the operation screen, all valves can be manually operated, and the status of the control equipment can be displayed on the operation screen. It can shorten the preheating time of the mold and adapt to the needs of flexible production. It adopts a programmable logic controller (PLC) architecture. Its integrated multiple temperature control modules realize closed-loop regulation and control of temperature through PID algorithm. In addition, it can also achieve improved temperature uniformity and stability, improve product qualification rate, avoid drastic temperature fluctuations, reduce the risk of thermal stress cracking of the mold, and reduce manual intervention in the automation system.

[0039] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A temperature control device for a mold, comprising a movable mold (2) and a fixed mold (1), wherein the movable mold (2) and the fixed mold (1) are both provided with cavities, characterized in that: An injection pipe (5) is installed on one side surface of the fixed mold (1), and the output end of the injection pipe (5) is connected to a branch pipe with a tail end extending into the cavity. Two discharge pipes (7) are installed on the other side surface of the fixed mold (1). An injection pipe (6), an exhaust pipe (8) and a discharge pipe (9) are installed through the top of the movable mold (2) from left to right. A variable temperature insulation component is installed inside the cavity of the fixed mold (1); The variable insulation component includes five variable plates (11), the five variable plates (11) are respectively attached to the five inner walls of the cavity in the fixed mold (1), and two adjacent variable plates (11) are connected by a thermal insulation strip (10). The variable plate (11) includes two heat-conducting plates (111) and a thermal insulation member (112) located between the two heat-conducting plates (111). The interior of the variable plate (11) is vacuum-treated. A driving motor is installed inside the variable plate (11), and the output end of the driving motor is connected to a bridge plate (113) made of a heat-conducting material. The surface of the fixed mold (1) is installed with electric extension rods (3) corresponding to the variable plates (11), and the power end of each electric extension rod (3) is connected to the surface of the variable plate (11), and the surface of the variable plate (11) close to the branch pipe side penetrates the surface of the sliding and the tail end of the branch pipe. The interior of the thermal insulation strip (10) is installed with a supplementary drain pipe (12) with a built-in check valve, and the surface of the supplementary drain pipe (12) is installed with an electronic valve.

2. A mold temperature control device according to claim 1, characterized in that: The thermal insulation strip (10) is made of elastic material, and the surface of the thermal insulation strip (10) is covered with elastic thermal insulation material. The five variable plates (11) and the thermal insulation strip (10) connected to the surface form a frame with an open top.

3. A mold temperature control device according to claim 1, characterized in that: The surface of the injection pipe 1 (5) is installed with a sealing valve 1 (50), the surface of one of the branch pipes is installed with a pneumatic regulating valve 1 (51) and a pressure sensor 1 (52), the surface of the other branch pipe is installed with a pneumatic regulating valve 2 (53) and a pressure sensor 2 (54), the surface of one of the discharge pipes 1 (7) is installed with a sealing valve 4 (71) and a temperature sensor 1 (72), the surface of the other discharge pipe 1 (7) is installed with a sealing valve 5 (73) and a temperature sensor 2 (74).

4. A mold temperature control device according to claim 1, characterized in that: The surface of the injection pipe 2 (6) is installed with a pneumatic regulating valve 3 (61), a sealing valve 2 (62) and a pressure sensor 3 (63). The surface of the portion of the injection pipe 2 (6) located in the movable mold (2) is installed with an air blowing pipe, and the surface of the air blowing pipe is installed with a sealing valve 3 (64). The surface of the exhaust pipe (8) is installed with a sealing valve 6 (81), and the surface of the exhaust pipe 2 (9) is installed with a sealing valve 7 (91).

5. The mold temperature control device according to claim 1, characterized in that: Two return pipes (4) are installed on the other side surface of the fixed mold (1), and the tail end of the return pipe (4) extends to the inside of the discharge pipe (7). The injection pipe (5), the injection pipe (6), the discharge pipe (7), the exhaust pipe (8), the discharge pipe (9) and the return pipe (4) are all installed with a one-way valve, and the installation position of the return pipe (4) is located below the installation position of the branch pipe.

6. The mold temperature control device according to claim 1, characterized in that: When the variable plate (11) expands outward, the driving motor drives the bridge plate (113) to be placed vertically; when the variable plate (111) retracts, the driving motor drives the bridge plate (113) to be placed obliquely, and the ends of the bridge plate (113) are respectively attached to the inner walls of the two heat conducting plates (111).

7. The mold temperature control device according to claim 1, characterized in that: A symmetrically arranged swing plate (13) is mounted on the inner wall of the inner cavity of the fixed mold (1) via a rotating shaft, and a symmetrically arranged micro electric telescopic rod (14) is mounted on the inner wall of the inner cavity of the fixed mold (1).

8. A mold temperature control device according to claim 7, characterized in that: The length of the swing plate (13) is less than the straight-line distance between the rotating shaft and the variable plate (11), and the projection of the movable end of the micro electric telescopic rod (14) and the swing plate (13) overlap in an unextended state.

9. A temperature control system for implementing the mold temperature control device according to any one of claims 1 to 8, characterized in that: It includes craft heating module, mold heating module, control module and replenishment and drainage module; The craft heating module is used to realize the heating operation in the movable mold (2); The mold heating module is used to realize the preheating operation of the cavity inside the fixed mold (1); The cooling control module is used to provide isolation processing when new and old coolants are injected into the cavity of the fixed mold (1); The supplementary drainage module is used to enable the coolant enclosed inside the thermal insulation strip (10) to be discharged through the supplementary drainage pipe (12).

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